feat: external time controller

2026-05-15 12:40:08 +00:00 · 2025-02-21 14:32:01 +09:00
41 changed files with 2710 additions and 520 deletions
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,6 +0,0 @@
-# This is a comment.
-# Each line is a file pattern followed by one or more owners.
-# https://docs.github.com/ja/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
-
-# Default owners
-* @mob-sakai
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -1,12 +0,0 @@
-# These are supported funding model platforms
-
-github: mob-sakai # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
-patreon: mob_sakai # Replace with a single Patreon username
-open_collective: # Replace with a single Open Collective username
-ko_fi: # Replace with a single Ko-fi username
-tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
-community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
-liberapay: # Replace with a single Liberapay username
-issuehunt: # Replace with a single IssueHunt username
-otechie: # Replace with a single Otechie username
-custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -1,35 +0,0 @@
---
-name: Bug report
-about: Create a report to help us improve
-title: ''
-labels: bug
-assignees: mob-sakai
-
---
-
-NOTE: Your issue may already be reported! Please search on the [issue tracker](../) before creating one.
-
-**Describe the bug**
-A clear and concise description of what the bug is.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
-
-**Expected behavior**
-A clear and concise description of what you expected to happen.
-
-**Screenshots**
-If applicable, add screenshots to help explain your problem.
-
-**Environment (please complete the following information):**
- - Version [e.g. 1.0.0]
- - Platform: [e.g. Editor(Windows/Mac), Standalone(Windows/Mac), iOS, Android, WebGL]
- - Unity version: [e.g. 2018.2.8f1]
- - Build options: [e.g. IL2CPP, .Net 4.x, LWRP]
-
-**Additional context**
-Add any other context about the problem here.
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -1,22 +0,0 @@
---
-name: Feature request
-about: Suggest an idea for this project
-title: ''
-labels: enhancement
-assignees: mob-sakai
-
---
-
-NOTE: Your issue may already be reported! Please search on the [issue tracker](../) before creating one.
-
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
-
-**Additional context**
-Add any other context or screenshots about the feature request here.
--- a/.github/ISSUE_TEMPLATE/question.md
+++ b/.github/ISSUE_TEMPLATE/question.md
@@ -1,16 +0,0 @@
---
-name: Question
-about: Ask a question about this project
-title: ''
-labels: question
-assignees: mob-sakai
-
---
-
-NOTE: Your issue may already be reported! Please search on the [issue tracker](../) before creating one.
-
-**Describe what help do you need**
-A description of the question.
-
-**Additional context**
-Add any other context or screenshots about the question here.
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -1,37 +0,0 @@
-
-# Pull Request Template
-
-## Description
-
- Please include a summary of the change and which issue is fixed.
- Please also include relevant motivation and context.
- List any dependencies that are required for this change.
-
-Fixes #{issue_number}
-
-## Type of change
-
-Please write the commit message in the format corresponding to the change type.
-Please see [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) for more information.
-
- [ ] Bug fix (non-breaking change which fixes an issue)  
- [ ] New feature (non-breaking change which adds functionality)  
- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [ ] Update documentations
- [ ] Others (refactoring, style changes, etc.)
-
-## Test environment
-
- Platform: [e.g. Editor(Windows/Mac), Standalone(Windows/Mac), iOS, Android, WebGL]
- Unity version: [e.g. 2022.2.0f1]
- Build options: [e.g. IL2CPP, .Net 4.x, URP/HDRP]
-
-## Checklist
-
- [ ] This pull request is for merging into the `develop` branch
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have checked my code and corrected any misspellings
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -1,28 +0,0 @@
-name: 🚀 Deploy with Zip
-
-on:
-  workflow_dispatch:
-    inputs:
-      zip:
-        description: "The url to the zip file"
-        required: true
-
-jobs:
-  deploy:
-    name: 🚀 Deploy
-    runs-on: ubuntu-latest
-    permissions:
-      pages: write
-      id-token: write
-    steps:
-      - name: 📦 Download zip file To '_site'
-        run: |
-          curl -L ${{ github.event.inputs.zip }} -o _site.zip
-          unzip _site.zip -d _site
-          find _site -name __MACOSX | xargs rm -rf
-
-      - name: 📦 Upload '_site'
-        uses: actions/upload-pages-artifact@v3
-
-      - name: 🚀 Deploy To GitHub Pages
-        uses: actions/deploy-pages@v4
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -5,9 +5,8 @@ on:
  workflow_dispatch:
  push:
    branches:
-      - preview
-      - main
-      - v*.x
+      - release
+      - release-*
    tags-ignore:
      - "**"

@@ -23,6 +22,9 @@ jobs:
      channel: ${{ steps.release.outputs.new_release_channel }}
      released: ${{ steps.release.outputs.new_release_published }}
      tag: ${{ steps.release.outputs.new_release_git_tag }}
+      version: ${{ steps.release.outputs.new_release_version }}
+      merge_to: ${{ steps.summary.outputs.merge_to }}
+      split_to: ${{ steps.summary.outputs.split_to }}
    steps:
      - name: 🚚 Checkout (${{ github.ref_name }})
        uses: actions/checkout@v4
@@ -38,7 +40,62 @@ jobs:
        env:
          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}

-      - run: |
+      - id: summary
+        run: |
          echo "🔖 New release published: '${{ steps.release.outputs.new_release_published }}'" | tee -a $GITHUB_STEP_SUMMARY
+          echo "🔖 New release version: '${{ steps.release.outputs.new_release_version }}'" | tee -a $GITHUB_STEP_SUMMARY
          echo "🔖 New release channel: '${{ steps.release.outputs.new_release_channel }}'" | tee -a $GITHUB_STEP_SUMMARY
          echo "🔖 New release git tag: '${{ steps.release.outputs.new_release_git_tag }}'" | tee -a $GITHUB_STEP_SUMMARY
+          
+          if [ '${{ steps.release.outputs.new_release_published }}' = 'false' ]; then
+            echo "No new release published." | tee -a $GITHUB_STEP_SUMMARY
+          elif [ '${{ github.ref_name }}' = 'release' ]; then
+            echo "merge_to=develop" | tee -a $GITHUB_OUTPUT $GITHUB_STEP_SUMMARY
+            echo "split_to=main" | tee -a $GITHUB_OUTPUT $GITHUB_STEP_SUMMARY
+          else
+            channel=$(echo ${{ github.ref_name }} | sed 's/^release-//')
+            echo "merge_to=develop-${channel}" | tee -a $GITHUB_OUTPUT $GITHUB_STEP_SUMMARY
+            echo "split_to=${channel}" | tee -a $GITHUB_OUTPUT $GITHUB_STEP_SUMMARY
+          fi
+
+  merge-to:
+    if: needs.release.outputs.merge_to != ''
+    needs: release
+    name: 🔀 Merge to ${{ needs.release.outputs.merge_to }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: 🚚 Checkout (${{ needs.release.outputs.merge_to }})
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ needs.release.outputs.merge_to }}
+          fetch-depth: 0
+      - name: 🔀 Merge '${{ needs.release.outputs.tag }}' into '${{ needs.release.outputs.merge_to }}'
+        run: |
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          
+          git merge ${{ needs.release.outputs.tag }}
+          git push origin ${{ needs.release.outputs.merge_to }}
+
+  split-to:
+    if: needs.release.outputs.split_to != ''
+    needs: release
+    name: 🔀 Split package to ${{ needs.release.outputs.split_to }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: 🚚 Checkout (${{ needs.release.outputs.tag }})
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ needs.release.outputs.tag }}
+          fetch-depth: 0
+      - name: 🔀 Split subtree 'Packages/src' to '${{ needs.release.outputs.split_to }}'
+        run: |
+          split_to=${{ needs.release.outputs.split_to }}
+          git branch $split_to origin/$split_to
+          git subtree split --prefix=Packages/src --branch $split_to
+          git tag ${{ needs.release.outputs.version }} $split_to
+          git push origin ${{ needs.release.outputs.version }} $split_to:$split_to
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,6 @@ env:
  MINIMUM_VERSION: 2019.4
  # EXCLUDE_FILTER: The excluded versions of Unity.
  EXCLUDE_FILTER: "(2020.2.0|2021.1|2023.3)"
-  PROJECT_PATH: .

 on:
  workflow_dispatch:
@@ -22,7 +21,7 @@ on:
  push:
    branches:
      - develop
-      - "develop-*"
+      - develop-preview
    tags:
      - "!*"
    paths-ignore:
@@ -72,11 +71,11 @@ jobs:
    steps:
      - name: 🚚 Checkout ($${{ github.ref }})
        if: github.event_name == 'push'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v4

      - name: 🚚 Checkout pull request (pull_request_target)
        if: github.event_name == 'pull_request_target'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0
@@ -86,27 +85,25 @@ jobs:
        run: |
          git config user.name "GitHub Actions"
          git config user.email "actions@github.com"
-          git rebase ${{ github.event.pull_request.base.sha }}
-          git log --oneline -n 10
+          git merge origin/${{ github.event.pull_request.base.ref }} --no-edit

      - name: 📥 Cache library
        uses: actions/cache@v4
        with:
-          path: ${{ env.PROJECT_PATH }}/Library
-          key: ${{ env.PROJECT_PATH }}-Library-${{ matrix.unityVersion }}-${{ github.event.pull_request.head.sha || github.sha }}
+          path: Library
+          key: Library-${{ matrix.unityVersion }}-${{ github.event.pull_request.head.sha || github.sha }}
          restore-keys: |
-            ${{ env.PROJECT_PATH }}-Library-${{ matrix.unityVersion }}-
-            ${{ env.PROJECT_PATH }}-Library-
+            Library-${{ matrix.unityVersion }}-
+            Library-

      - name: 🛠️ Build Unity Project (Test)
-        uses: game-ci/unity-builder@main
+        uses: game-ci/unity-builder@v4
        timeout-minutes: 45
        with:
          customImage: ghcr.io/mob-sakai/unity3d:${{ matrix.unityVersion }}
          targetPlatform: StandaloneLinux64
          allowDirtyBuild: true
          customParameters: -nographics
-          projectPath: ${{ env.PROJECT_PATH }}
        env:
          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
@@ -121,7 +118,6 @@ jobs:
          customParameters: -nographics
          checkName: ${{ matrix.unityVersion }} Test Results
          githubToken: ${{ github.token }}
-          projectPath: ${{ env.PROJECT_PATH }}
        env:
          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
--- a/Assets/ProjectSettings/NanoMonitor.asset
+++ b/Assets/ProjectSettings/NanoMonitor.asset
@@ -18,12 +18,11 @@ MonoBehaviour:
  m_EnabledInEditor: 1
  m_AlwaysIncludeAssembly: 1
  m_InstantiateOnLoad: 1
-  m_Prefab: {fileID: 4567906826058368312, guid: 7cebff2d255b9433cbe23b243c193329,
+  m_Prefab: {fileID: 7211429669315726685, guid: b73940fc30a2f4eb9a73783e9c1f8da6,
    type: 3}
  m_Interval: 0.5
  m_Anchor: 0
  m_Width: 750
-  m_HelpUrl: https://github.com/mob-sakai/ParticleEffectForUGUI
  m_CustomMonitorItems:
  - m_Format: Screen:{0}x{1}
    m_Arg0:
--- a/Assets/ProjectSettings/NanoMonitor.prefab
+++ b/Assets/ProjectSettings/NanoMonitor.prefab
--- a/Assets/ProjectSettings/NanoMonitor.prefab.meta
+++ b/Assets/ProjectSettings/NanoMonitor.prefab.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: b73940fc30a2f4eb9a73783e9c1f8da6
+PrefabImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/Assets/ProjectSettings/UIParticleProjectSettings.asset
+++ b/Assets/ProjectSettings/UIParticleProjectSettings.asset
@@ -10,7 +10,7 @@ MonoBehaviour:
  m_Enabled: 1
  m_EditorHideFlags: 0
  m_Script: {fileID: 11500000, guid: f22a23b9d98e440478697f4adf30e61c, type: 3}
-  m_Name: UIParticleProjectSettings
+  m_Name: UIParticle
  m_EditorClassIdentifier: 
  m_EnableLinearToGamma: 1
  m_HideGeneratedObjects: 1
--- a/Assets/ProjectSettings/UIParticleProjectSettings.asset.meta
+++ b/Assets/ProjectSettings/UIParticleProjectSettings.asset.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: a5b9278dfbd194d04b1c6ae7031928c1
+guid: 4b9df7b8a4193489299b8f477348ae0c
 NativeFormatImporter:
  externalObjects: {}
  mainObjectFileID: 11400000
--- a/Assets/Tests/Editor/NewTestScript.cs
+++ b/Assets/Tests/Editor/NewTestScript.cs
@@ -1,21 +1,16 @@
 using System.Collections;
-using Coffee.UIParticleInternal;
 using NUnit.Framework;
-using UnityEngine;
 using UnityEngine.TestTools;

 namespace Coffee.UIParticle.Editor.Tests
 {
    public class NewTestScript
    {
-        [TestCase(-1)]
-        [TestCase(0)]
-        [TestCase(2048)]
-        [TestCase(3000)]
-        public void GetParticleArray(int requiredSize)
+        // A Test behaves as an ordinary method
+        [Test]
+        public void NewTestScriptSimplePasses()
        {
-            var array = ParticleSystemExtensions.GetParticleArray(requiredSize);
-            Debug.Log($"requiredSize: {requiredSize}, array.Length: {array.Length}");
+            // Use the Assert class to test conditions
        }

        // A UnityTest behaves like a coroutine in Play Mode. In Edit Mode you can use
--- a/Packages/packages-lock.json
+++ b/Packages/packages-lock.json
@@ -5,14 +5,14 @@
      "depth": 0,
      "source": "git",
      "dependencies": {},
-      "hash": "3c280f1a8f4db5038b881ff07f270efd9638fa31"
+      "hash": "52987fb6e66e7fc48498d8d164c3c8808de4de6b"
    },
    "com.coffee.minimal-resource": {
      "version": "https://github.com/mob-sakai/Coffee.Internal.git?path=Packages/MinimalResource",
      "depth": 0,
      "source": "git",
      "dependencies": {},
-      "hash": "3c280f1a8f4db5038b881ff07f270efd9638fa31"
+      "hash": "52987fb6e66e7fc48498d8d164c3c8808de4de6b"
    },
    "com.coffee.nano-monitor": {
      "version": "https://github.com/mob-sakai/Coffee.Internal.git?path=Packages/NanoMonitor",
@@ -21,7 +21,7 @@
      "dependencies": {
        "com.unity.ugui": "1.0.0"
      },
-      "hash": "3c280f1a8f4db5038b881ff07f270efd9638fa31"
+      "hash": "52987fb6e66e7fc48498d8d164c3c8808de4de6b"
    },
    "com.coffee.ui-particle": {
      "version": "file:src",
--- a/Packages/src/.releaserc.json
+++ b/Packages/src/.releaserc.json
@@ -1,13 +1,12 @@
 {
  "branches": [
-    "main",
-    "[0-9]+.x",
+    "release",
+    "release-4.x",
    {
-      "name": "preview",
-      "prerelease": true
+      "name": "release-preview",
+      "prerelease": "preview"
    }
  ],
-  "tagFormat": "${version}",
  "plugins": [
    "@semantic-release/commit-analyzer",
    "@semantic-release/release-notes-generator",
--- a/Packages/src/CHANGELOG.md
+++ b/Packages/src/CHANGELOG.md
@@ -1,25 +1,11 @@
-# [5.0.0-preview.16](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/5.0.0-preview.15...5.0.0-preview.16) (2025-03-15)
+## [4.10.7](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.6...v4.10.7) (2025-01-14)


 ### Bug Fixes

-* IL2CPP build fails on older versions of Unity ([0da6525](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/0da652520cd165b43de7404c0b0ab1fbcf9349d1))
-* NRE on enable ([0cff50e](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/0cff50ef696aa53fb7c46a9a737b7cf3a05b7b9b)), closes [#359](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/359)
-
-# [5.0.0-preview.15](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/5.0.0-preview.14...5.0.0-preview.15) (2025-02-21)
-
-
-### Bug Fixes
-
-* component icons will no longer be displayed in the scene view ([6dfbdae](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/6dfbdae38d3822ab9c2c6f0e4ca1ca32ee98a239))
 * editor crashed on exit play mode (editor, windows) ([47ee45c](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/47ee45cbbe651a8f87ca2b8a3948f8b88db8211e)), closes [#351](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/351)

-
-### Features
-
-* add 'TimeScaleMultiplier' option ([925af0b](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/925af0b6046f65f23a778f67cefa8ff9cbedb513))
-
-# [5.0.0-preview.14](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/5.0.0-preview.13...5.0.0-preview.14) (2025-01-03)
+## [4.10.6](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.5...v4.10.6) (2025-01-03)


 ### Bug Fixes
@@ -27,19 +13,6 @@
 * sub-emitter particles may not render correctly in certain scenarios ([8276684](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/8276684c3b1646f0490ed64557547ba15281664a)), closes [#348](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/348)
 * sub-emitter's `inherit velocity` module doubles at runtime ([67de3d1](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/67de3d1bd3e16dc9b564625cb990c53d75769506)), closes [#349](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/349)

-# [5.0.0-preview.13](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/5.0.0-preview.12...5.0.0-preview.13) (2025-01-03)
-
-
-### Features
-
-* change the default value of `UIParticle.scale` from `10` to `1` ([9955eef](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/9955eefdc22cf565502f85c87cd2efd3a25fbe50))
-* UIParticle no longer inherits from MaskableGraphic ([c09bfb8](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/c09bfb81abc9179bf5fc49d29eaf7fc4ed01a4dc))
-
-
-### BREAKING CHANGES
-
-* Some members inherited from MaskableGraphic will no longer be available.
-
 ## [4.10.5](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.4...v4.10.5) (2024-12-23)


--- a/Packages/src/Editor/AnimatablePropertyEditor.cs
+++ b/Packages/src/Editor/AnimatablePropertyEditor.cs
@@ -76,7 +76,7 @@ namespace Coffee.UIExtensions
            for (var j = 0; j < mats.Count; j++)
            {
                var mat = mats[j];
-                if (mat == null || mat.shader == null) continue;
+                if (!mat || !mat.shader) continue;

                for (var i = 0; i < ShaderUtil.GetPropertyCount(mat.shader); i++)
                {
--- a/Packages/src/Editor/UIParticleEditor.cs
+++ b/Packages/src/Editor/UIParticleEditor.cs
@@ -2,6 +2,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
 using UnityEditor;
+using UnityEditor.UI;
 using UnityEditorInternal;
 using UnityEngine;
 using UnityEngine.Profiling;
@@ -25,7 +26,7 @@ namespace Coffee.UIExtensions
 {
    [CustomEditor(typeof(UIParticle))]
    [CanEditMultipleObjects]
-    internal class UIParticleEditor : Editor
+    internal class UIParticleEditor : GraphicEditor
    {
        internal class State : ScriptableSingleton<State>
        {
@@ -61,7 +62,6 @@ namespace Coffee.UIExtensions
        private SerializedProperty _autoScalingMode;
        private SerializedProperty _useCustomView;
        private SerializedProperty _customViewSize;
-        private SerializedProperty _timeScaleMultiplier;
        private ReorderableList _ro;
        private bool _showMax;
        private bool _is3DScaleMode;
@@ -86,8 +86,10 @@ namespace Coffee.UIExtensions
        /// <summary>
        /// This function is called when the object becomes enabled and active.
        /// </summary>
-        private void OnEnable()
+        protected override void OnEnable()
        {
+            base.OnEnable();
+
            _maskable = serializedObject.FindProperty("m_Maskable");
            _scale3D = serializedObject.FindProperty("m_Scale3D");
            _animatableProperties = serializedObject.FindProperty("m_AnimatableProperties");
@@ -98,7 +100,6 @@ namespace Coffee.UIExtensions
            _autoScalingMode = serializedObject.FindProperty("m_AutoScalingMode");
            _useCustomView = serializedObject.FindProperty("m_UseCustomView");
            _customViewSize = serializedObject.FindProperty("m_CustomViewSize");
-            _timeScaleMultiplier = serializedObject.FindProperty("m_TimeScaleMultiplier");

            var sp = serializedObject.FindProperty("m_Particles");
            _ro = new ReorderableList(sp.serializedObject, sp, true, true, true, true)
@@ -107,7 +108,7 @@ namespace Coffee.UIExtensions
                {
                    var ps = sp.GetArrayElementAtIndex(index).objectReferenceValue as ParticleSystem;
                    var materialCount = 0;
-                    if (ps != null && ps.TryGetComponent<ParticleSystemRenderer>(out var psr))
+                    if (ps && ps.TryGetComponent<ParticleSystemRenderer>(out var psr))
                    {
                        materialCount = psr.sharedMaterials.Length;
                    }
@@ -121,7 +122,7 @@ namespace Coffee.UIExtensions
                    var p = sp.GetArrayElementAtIndex(index);
                    EditorGUI.ObjectField(rect, p, GUIContent.none);
                    var ps = p.objectReferenceValue as ParticleSystem;
-                    if (ps == null || !ps.TryGetComponent<ParticleSystemRenderer>(out var psr)) return;
+                    if (!ps || !ps.TryGetComponent<ParticleSystemRenderer>(out var psr)) return;

                    rect.x += 15;
                    rect.width -= 15;
@@ -188,7 +189,7 @@ namespace Coffee.UIExtensions
        public override void OnInspectorGUI()
        {
            var current = target as UIParticle;
-            if (current == null) return;
+            if (!current) return;

            Profiler.BeginSample("(UIP:E) OnInspectorGUI");
            serializedObject.Update();
@@ -243,9 +244,6 @@ namespace Coffee.UIExtensions
                _customViewSize.floatValue = Mathf.Max(0.1f, _customViewSize.floatValue);
            }

-            // Time Scale Multiplier
-            EditorGUILayout.PropertyField(_timeScaleMultiplier);
-
            // Target ParticleSystems.
            EditorGUI.BeginChangeCheck();
            _ro.DoLayoutList();
@@ -264,7 +262,7 @@ namespace Coffee.UIExtensions
            Profiler.BeginSample("(UIP:E) Non-UI built-in shader is not supported.");
            foreach (var mat in s_TempMaterials)
            {
-                if (mat == null || mat.shader == null) continue;
+                if (!mat || !mat.shader) continue;
                var shader = mat.shader;
                if (IsBuiltInObject(shader) && !shader.name.StartsWith("UI/"))
                {
@@ -283,7 +281,7 @@ namespace Coffee.UIExtensions
            {
                foreach (var mat in s_TempMaterials)
                {
-                    if (mat == null || mat.shader == null) continue;
+                    if (!mat || !mat.shader) continue;
                    var shader = mat.shader;
                    if (!s_Shaders.Add(shader)) continue;

@@ -461,11 +459,9 @@ namespace Coffee.UIExtensions
        {
            if (!p || (ignoreCurrent && target == p)) return;

-            Misc.DestroyImmediate(p);
-            if (p.TryGetComponent<CanvasRenderer>(out var cr))
-            {
-                Misc.DestroyImmediate(cr);
-            }
+            var cr = p.canvasRenderer;
+            DestroyImmediate(p);
+            DestroyImmediate(cr);

 #if UNITY_2018_3_OR_NEWER
            var stage = PrefabStageUtility.GetCurrentPrefabStage();
--- a/Packages/src/Icons.meta
+++ b/Packages/src/Icons.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 7a55e246f37df405bac88eac692e3a86
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/Packages/src/Editor/UIParticleIcon.png
+++ b/Packages/src/Editor/UIParticleIcon.png
--- a/Packages/src/Editor/UIParticleIcon.png.meta
+++ b/Packages/src/Editor/UIParticleIcon.png.meta
--- a/Packages/src/README.md
+++ b/Packages/src/README.md
@@ -1,9 +1,9 @@
-# <img alt="UIParticleIcon" src="https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/d76e105e-a840-4f61-a1f6-8cf311c0812d" width="26"/> UI Particle v5 <!-- omit in toc -->
+# <img alt="UIParticleIcon" src="https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/d76e105e-a840-4f61-a1f6-8cf311c0812d" width="26"/> Particle Effect For UGUI (UI Particle) <!-- omit in toc -->

 [![](https://img.shields.io/npm/v/com.coffee.ui-particle?label=openupm&registry_uri=https://package.openupm.com)](https://openupm.com/packages/com.coffee.ui-particle/)
 [![](https://img.shields.io/github/v/release/mob-sakai/ParticleEffectForUGUI)](https://github.com/mob-sakai/ParticleEffectForUGUI/releases)
 [![](https://img.shields.io/github/license/mob-sakai/ParticleEffectForUGUI.svg)](https://github.com/mob-sakai/ParticleEffectForUGUI/blob/main/LICENSE.md)  
-![](https://img.shields.io/badge/Unity-2019.3+-57b9d3.svg?style=flat&logo=unity)
+![](https://img.shields.io/badge/Unity-2018.2+-57b9d3.svg?style=flat&logo=unity)
 ![](https://img.shields.io/badge/uGUI_2.0_Ready-57b9d3.svg?style=flat)
 ![](https://img.shields.io/badge/UPR%2FHDPR_Ready-57b9d3.svg?style=flat)  
 ![](https://github.com/mob-sakai/ParticleEffectForUGUI/actions/workflows/test.yml/badge.svg?branch=develop)
@@ -11,7 +11,7 @@
 [![](https://img.shields.io/github/watchers/mob-sakai/ParticleEffectForUGUI.svg?style=social&label=Watch)](https://github.com/mob-sakai/ParticleEffectForUGUI/subscription)
 [![](https://img.shields.io/twitter/follow/mob_sakai.svg?label=Follow&style=social)](https://twitter.com/intent/follow?screen_name=mob_sakai)

-<< [📝 Description](#-description-) | [📌 Key Features](#-key-features) | [🎮 Demo](#-demo) | [⚙ Installation](#-installation) | [🔄 Upgrading to 5.x](#-upgrading-from-3x4x-to-5x) | [🚀 Usage](#-usage) | [🛠 Development Note](#-development-note) | [🤝 Contributing](#-contributing) >>
+<< [📝 Description](#-description-) | [📌 Key Features](#-key-features) | [🎮 Demo](#-demo) | [⚙ Installation](#-installation) | [🚀 Usage](#-usage) | [🛠 Development Note](#-development-note) | [🤝 Contributing](#-contributing) >>

 ## 📝 Description <!-- omit in toc -->

@@ -26,9 +26,7 @@ You can render, mask, and sort your `ParticleSystems` for UI without the need fo
    - [Install via OpenUPM](#install-via-openupm)
    - [Install via UPM (with Package Manager UI)](#install-via-upm-with-package-manager-ui)
    - [Install via UPM (Manually)](#install-via-upm-manually)
-  - [Install as Embedded Package](#install-as-embedded-package)
- [🔄 Upgrading from v3/v4 to v5](#-upgrading-from-v3v4-to-v5)
-  - [Breaking Changes](#breaking-changes)
+    - [Install as Embedded Package](#install-as-embedded-package)
 - [🚀 Usage](#-usage)
  - [Component: UIParticle](#component-uiparticle)
  - [Basic Usage](#basic-usage)
@@ -106,7 +104,7 @@ You can render, mask, and sort your `ParticleSystems` for UI without the need fo

 ## ⚙ Installation

-_This package requires **Unity 2019.3 or later**._
+_This package requires **Unity 2018.3 or later**._

 #### Install via OpenUPM

@@ -118,16 +116,16 @@ _This package requires **Unity 2019.3 or later**._
  ```
 - To update the package, use Package Manager UI (`Window > Package Manager`) or run the following command with `@{version}`:
  ```
-  openupm add com.coffee.ui-particle@5.0.0
+  openupm add com.coffee.ui-particle@4.9.0
  ```

 #### Install via UPM (with Package Manager UI)

 - Click `Window > Package Manager` to open Package Manager UI.
- Click `+ > Add package from git URL...` and input the repository URL: `https://github.com/mob-sakai/ParticleEffectForUGUI.git?path=Packages/src`  
+- Click `+ > Add package from git URL...` and input the repository URL: `https://github.com/mob-sakai/ParticleEffectForUGUI.git`  
  ![](https://github.com/user-attachments/assets/f88f47ad-c606-44bd-9e86-ee3f72eac548)
 - To update the package, change suffix `#{version}` to the target version.
-  - e.g. `https://github.com/mob-sakai/ParticleEffectForUGUI.git?path=Packages/src#5.0.0`
+  - e.g. `https://github.com/mob-sakai/ParticleEffectForUGUI.git#4.9.0`

 #### Install via UPM (Manually)

@@ -135,41 +133,22 @@ _This package requires **Unity 2019.3 or later**._
  ```json
  {
    "dependencies": {
-      "com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git?path=Packages/src",
+      "com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git",
      ...
    }
  }
  ```

 - To update the package, change suffix `#{version}` to the target version.
-  - e.g. `"com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git?path=Packages/src#5.0.0",`
+  - e.g. `"com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git#4.9.0",`

-### Install as Embedded Package
+#### Install as Embedded Package

-1. Download the `Source code (zip)` file from [Releases](https://github.com/mob-sakai/ParticleEffectForUGUI/releases) and
-   extract it.
-2. Move the `<extracted_dir>/Packages/src` directory into your project's `Packages` directory.  
-   ![](https://github.com/user-attachments/assets/187cbcbe-5922-4ed5-acec-cf19aa17d208)
-    - You can rename the `src` directory if needed.
-    - If you intend to fix bugs or add features, installing it as an embedded package is recommended.
-    - To update the package, re-download it and replace the existing contents.
-
-<br><br>
-
-## 🔄 Upgrading from v3/v4 to v5
-
-### Breaking Changes
-
- The default value of `UIParticle.scale` has been changed from `10` to `1`.
- `UIParticle` no longer inherits from `MaskableGraphic`.
- If you are installing via git URL, add `?path=Packages/src`.
-   ```json
-   // v3/v4
-   "com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git",
-   
-   // v5
-   "com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git?path=Packages/src",
-   ```
+1. Download a source code zip file from [Releases](https://github.com/mob-sakai/ParticleEffectForUGUI.git/releases) and extract it.
+2. Place it in your project's `Packages` directory.  
+   ![](https://github.com/mob-sakai/mob-sakai/assets/12690315/0b7484b4-5fca-43b0-a9ef-e5dbd99bcdb4)
+- If you want to fix bugs or add features, install it as an embedded package.
+- To update the package, you need to re-download it and replace the contents.

 <br><br>

@@ -179,7 +158,7 @@ _This package requires **Unity 2019.3 or later**._

 `UIParticle` controls the ParticleSystems that are attached to its own game objects and child game objects.

-![](https://github.com/user-attachments/assets/bc9eb783-afce-4102-ac61-aee9ea8d6f2f)
+![](https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/1cf5753b-33fc-4cef-91c3-413c515a954f)

 - **Maskable**: Does this graphic allow maskable.
 - **Scale**: Scale the rendering particles. When the `3D` toggle is enabled, 3D scale (x, y, z) is supported.
@@ -201,7 +180,6 @@ _This package requires **Unity 2019.3 or later**._
  - **UIParticle:** UIParticle.scale will be adjusted.
 - **Use Custom View:** Use this if the particles are not displayed correctly due to min/max particle size.
  - **Custom view size:** Change the bake view size.
- **Time Scale Multiplier:** Time scale multiplier.
 - **Rendering Order**: The ParticleSystem list to be rendered. You can change the order and the materials.

 **NOTE:** Press the `Refresh` button to reconstruct the rendering order based on children ParticleSystem's sorting order
@@ -232,7 +210,7 @@ and z-position.
 If you want to mask particles, set a stencil-supported shader (such as `UI/UIAdditive`) to the material for
 ParticleSystem.
 If you use some custom shaders, see
-the [How to Make a Custom Shader to Support Mask/RectMask2D Component](#how-to-make-a-custom-shader-to-support-mask-and-rectmask2d-component)
+the [How to Make a Custom Shader to Support Mask/RectMask2D Component](#how-to-make-a-custom-shader-to-support-maskrectmask2d-component)
 section.

 ![](https://user-images.githubusercontent.com/12690315/95017591-3b512700-0695-11eb-864e-04166ea1809a.png)
--- a/Packages/src/Runtime/Coffee.UIParticle.R.dll
+++ b/Packages/src/Runtime/Coffee.UIParticle.R.dll
--- a/Packages/src/Runtime/Internal/Extensions/ComponentExtensions.cs
+++ b/Packages/src/Runtime/Internal/Extensions/ComponentExtensions.cs
@@ -38,7 +38,7 @@ namespace Coffee.UIParticleInternal
        private static void GetComponentsInChildren_Internal<T>(this Component self, List<T> results, int depth)
            where T : Component
        {
-            if (self == null || results == null || depth < 0) return;
+            if (!self || results == null || depth < 0) return;

            var tr = self.transform;
            if (tr.TryGetComponent<T>(out var t))
@@ -59,7 +59,7 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        public static T GetOrAddComponent<T>(this Component self) where T : Component
        {
-            if (self == null) return null;
+            if (!self) return null;
            return self.TryGetComponent<T>(out var component)
                ? component
                : self.gameObject.AddComponent<T>();
@@ -166,7 +166,7 @@ namespace Coffee.UIParticleInternal
 #if !UNITY_2021_2_OR_NEWER && !UNITY_2020_3_45 && !UNITY_2020_3_46 && !UNITY_2020_3_47 && !UNITY_2020_3_48
        public static T GetComponentInParent<T>(this Component self, bool includeInactive) where T : Component
        {
-            if (self == null) return null;
+            if (!self) return null;
            if (!includeInactive) return self.GetComponentInParent<T>();

            var current = self.transform;
@@ -184,9 +184,9 @@ namespace Coffee.UIParticleInternal
        /// <summary>
        /// Verify whether it can be converted to the specified component.
        /// </summary>
-            internal static bool CanConvertTo<T>(this Object context) where T : MonoBehaviour
+        internal static bool CanConvertTo<T>(this Object context) where T : MonoBehaviour
        {
-            return context != null && context.GetType() != typeof(T);
+            return context && context.GetType() != typeof(T);
        }

        /// <summary>
@@ -204,7 +204,7 @@ namespace Coffee.UIParticleInternal
            target.enabled = false;

            // Find MonoScript of the specified component.
-            foreach (var script in MonoImporter.GetAllRuntimeMonoScripts())
+            foreach (var script in Resources.FindObjectsOfTypeAll<MonoScript>())
            {
                if (script.GetClass() != typeof(T))
                {
--- a/Packages/src/Runtime/Internal/Extensions/SpriteExtensions.cs
+++ b/Packages/src/Runtime/Internal/Extensions/SpriteExtensions.cs
@@ -32,10 +32,10 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        public static Texture2D GetActualTexture(this Sprite self)
        {
-            if (self == null) return null;
+            if (!self) return null;

            var ret = s_GetActiveAtlasTextureMethod(self);
-            return ret != null ? ret : self.texture;
+            return ret ? ret : self.texture;
        }

        /// <summary>
@@ -43,7 +43,7 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        public static SpriteAtlas GetActiveAtlas(this Sprite self)
        {
-            if (self == null) return null;
+            if (!self) return null;

            return s_GetActiveAtlasMethod(self);
        }
@@ -53,7 +53,7 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        internal static Texture2D GetActualTexture(this Sprite self)
        {
-            return self != null ? self.texture : null;
+            return self ? self.texture : null;
        }
 #endif
    }
--- a/Packages/src/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
+++ b/Packages/src/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
@@ -37,7 +37,7 @@ namespace Coffee.UIParticleInternal
            foreach (var t in TypeCache.GetTypesDerivedFrom(typeof(PreloadedProjectSettings<>)))
            {
                var defaultSettings = GetDefaultSettings(t);
-                if (defaultSettings == null)
+                if (!defaultSettings)
                {
                    // When create a new instance, automatically set it as default settings.
                    defaultSettings = CreateInstance(t) as PreloadedProjectSettings;
@@ -48,7 +48,7 @@ namespace Coffee.UIParticleInternal
                    SetDefaultSettings(defaultSettings);
                }

-                if (defaultSettings != null)
+                if (defaultSettings)
                {
                    defaultSettings.OnInitialize();
                }
@@ -66,7 +66,7 @@ namespace Coffee.UIParticleInternal
        private static Object[] GetPreloadedSettings(Type type)
        {
            return PlayerSettings.GetPreloadedAssets()
-                .Where(x => x != null && x.GetType() == type)
+                .Where(x => x && x.GetType() == type)
                .ToArray();
        }

@@ -76,12 +76,12 @@ namespace Coffee.UIParticleInternal
                   ?? AssetDatabase.FindAssets($"t:{nameof(PreloadedProjectSettings)}")
                       .Select(AssetDatabase.GUIDToAssetPath)
                       .Select(AssetDatabase.LoadAssetAtPath<PreloadedProjectSettings>)
-                       .FirstOrDefault(x => x != null && x.GetType() == type);
+                       .FirstOrDefault(x => x && x.GetType() == type);
        }

        protected static void SetDefaultSettings(PreloadedProjectSettings asset)
        {
-            if (asset == null) return;
+            if (!asset) return;

            var type = asset.GetType();
            if (string.IsNullOrEmpty(AssetDatabase.GetAssetPath(asset)))
@@ -103,7 +103,7 @@ namespace Coffee.UIParticleInternal
            var preloadedAssets = PlayerSettings.GetPreloadedAssets();
            var projectSettings = GetPreloadedSettings(type);
            PlayerSettings.SetPreloadedAssets(preloadedAssets
-                .Where(x => x != null)
+                .Where(x => x)
                .Except(projectSettings.Except(new[] { asset }))
                .Append(asset)
                .Distinct()
@@ -133,19 +133,19 @@ namespace Coffee.UIParticleInternal
 #if UNITY_EDITOR
        private string _jsonText;

-        public static bool hasInstance => s_Instance != null;
+        public static bool hasInstance => s_Instance;

        public static T instance
        {
            get
            {
-                if (s_Instance != null) return s_Instance;
+                if (s_Instance) return s_Instance;

                s_Instance = GetDefaultSettings(typeof(T)) as T;
-                if (s_Instance != null) return s_Instance;
+                if (s_Instance) return s_Instance;

                s_Instance = CreateInstance<T>();
-                if (s_Instance == null)
+                if (!s_Instance)
                {
                    s_Instance = null;
                    return s_Instance;
@@ -174,7 +174,7 @@ namespace Coffee.UIParticleInternal
            }
        }
 #else
-    public static T instance => s_Instance != null ? s_Instance : s_Instance = CreateInstance<T>();
+        public static T instance => s_Instance ? s_Instance : s_Instance = CreateInstance<T>();
 #endif

        /// <summary>
@@ -183,7 +183,7 @@ namespace Coffee.UIParticleInternal
        protected virtual void OnEnable()
        {
 #if UNITY_EDITOR
-            var isDefaultSettings = s_Instance == null || s_Instance == this || GetDefaultSettings(typeof(T)) == this;
+            var isDefaultSettings = !s_Instance || s_Instance == this || GetDefaultSettings(typeof(T)) == this;
            if (!isDefaultSettings)
            {
                DestroyImmediate(this, true);
@@ -193,7 +193,7 @@ namespace Coffee.UIParticleInternal
            EditorApplication.playModeStateChanged += OnPlayModeStateChanged;
 #endif

-            if (s_Instance != null) return;
+            if (s_Instance) return;
            s_Instance = this as T;
        }

@@ -222,7 +222,7 @@ namespace Coffee.UIParticleInternal

            public override void OnGUI(string searchContext)
            {
-                if (_target == null)
+                if (!_target)
                {
                    if (_editor)
                    {
--- a/Packages/src/Runtime/Internal/Utilities/Logging.cs
+++ b/Packages/src/Runtime/Internal/Utilities/Logging.cs
@@ -48,7 +48,7 @@ namespace Coffee.UIParticleInternal
        public static void LogIf(bool enable, object tag, object message, Object context = null)
        {
            if (!enable) return;
-            Log_Internal(LogType.Log, tag, message, context != null ? context : tag as Object);
+            Log_Internal(LogType.Log, tag, message, context ? context : tag as Object);
        }

 #if !ENABLE_COFFEE_LOGGER
@@ -56,7 +56,7 @@ namespace Coffee.UIParticleInternal
 #endif
        public static void Log(object tag, object message, Object context = null)
        {
-            Log_Internal(LogType.Log, tag, message, context != null ? context : tag as Object);
+            Log_Internal(LogType.Log, tag, message, context ? context : tag as Object);
        }

 #if !ENABLE_COFFEE_LOGGER
@@ -64,13 +64,13 @@ namespace Coffee.UIParticleInternal
 #endif
        public static void LogWarning(object tag, object message, Object context = null)
        {
-            Log_Internal(LogType.Warning, tag, message, context != null ? context : tag as Object);
+            Log_Internal(LogType.Warning, tag, message, context ? context : tag as Object);
        }

        public static void LogError(object tag, object message, Object context = null)
        {
 #if ENABLE_COFFEE_LOGGER
-            Log_Internal(LogType.Error, tag, message, context != null ? context : tag as Object);
+            Log_Internal(LogType.Error, tag, message, context ? context : tag as Object);
 #else
            Debug.LogError($"{tag}: {message}", context);
 #endif
--- a/Packages/src/Runtime/Internal/Utilities/Misc.cs
+++ b/Packages/src/Runtime/Internal/Utilities/Misc.cs
@@ -3,16 +3,11 @@ using System.Diagnostics;
 using UnityEditor;
 using UnityEngine;
 using Object = UnityEngine.Object;
-#if UNITY_EDITOR
-using System.IO;
-using System.Linq;
-using System.Reflection;
-#if UNITY_2021_2_OR_NEWER
+#if UNITY_EDITOR && UNITY_2021_2_OR_NEWER
 using UnityEditor.SceneManagement;
-#else
+#elif UNITY_EDITOR
 using UnityEditor.Experimental.SceneManagement;
 #endif
-#endif

 namespace Coffee.UIParticleInternal
 {
@@ -29,7 +24,7 @@ namespace Coffee.UIParticleInternal

        public static void Destroy(Object obj)
        {
-            if (obj == null) return;
+            if (!obj) return;
 #if UNITY_EDITOR
            if (!Application.isPlaying)
            {
@@ -44,7 +39,7 @@ namespace Coffee.UIParticleInternal

        public static void DestroyImmediate(Object obj)
        {
-            if (obj == null) return;
+            if (!obj) return;
 #if UNITY_EDITOR
            if (Application.isEditor)
            {
@@ -61,7 +56,7 @@ namespace Coffee.UIParticleInternal
        public static void SetDirty(Object obj)
        {
 #if UNITY_EDITOR
-            if (obj == null) return;
+            if (!obj) return;
            EditorUtility.SetDirty(obj);
 #endif
        }
@@ -77,56 +72,5 @@ namespace Coffee.UIParticleInternal

        public static bool isBatchOrBuilding => Application.isBatchMode || BuildPipeline.isBuildingPlayer;
 #endif
-
-        [Conditional("UNITY_EDITOR")]
-        public static void QueuePlayerLoopUpdate()
-        {
-#if UNITY_EDITOR
-            if (!EditorApplication.isPlaying)
-            {
-                EditorApplication.QueuePlayerLoopUpdate();
-            }
-#endif
-        }
    }
-
-#if !UNITY_2021_2_OR_NEWER
-    [AttributeUsage(AttributeTargets.Class)]
-    [Conditional("UNITY_EDITOR")]
-    internal class IconAttribute : Attribute
-    {
-        private readonly string _path;
-
-        public IconAttribute(string path)
-        {
-            _path = path;
-        }
-
-#if UNITY_EDITOR
-        private static Action<Object, Texture2D> s_SetIconForObject = typeof(EditorGUIUtility)
-            .GetMethod("SetIconForObject", BindingFlags.Static | BindingFlags.NonPublic)
-            .CreateDelegate(typeof(Action<Object, Texture2D>), null) as Action<Object, Texture2D>;
-
-        [InitializeOnLoadMethod]
-        private static void InitializeOnLoadMethod()
-        {
-            if (Misc.isBatchOrBuilding) return;
-
-            var types = TypeCache.GetTypesWithAttribute<IconAttribute>();
-            var scripts = MonoImporter.GetAllRuntimeMonoScripts();
-            foreach (var type in types)
-            {
-                var script = scripts.FirstOrDefault(x => x.GetClass() == type);
-                if (script == null) continue;
-
-                var path = type.GetCustomAttribute<IconAttribute>()?._path;
-                var icon = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
-                if (icon == null) continue;
-
-                s_SetIconForObject(script, icon);
-            }
-        }
-#endif
-    }
-#endif
 }
--- a/Packages/src/Runtime/Internal/Utilities/ObjectRepository.cs
+++ b/Packages/src/Runtime/Internal/Utilities/ObjectRepository.cs
@@ -90,7 +90,7 @@ namespace Coffee.UIParticleInternal
            Profiler.BeginSample("(COF)[ObjectRepository] GetFromCache");
            if (_cache.TryGetValue(hash, out var entry))
            {
-                if (entry.storedObject == null)
+                if (!entry.storedObject)
                {
                    Release(ref entry.storedObject);
                    Profiler.EndSample();
@@ -116,7 +116,7 @@ namespace Coffee.UIParticleInternal

        private void Add(Hash128 hash, ref T obj, T newObject)
        {
-            if (newObject == null)
+            if (!newObject)
            {
                Release(ref obj);
                obj = newObject;
@@ -151,7 +151,7 @@ namespace Coffee.UIParticleInternal
                && _cache.TryGetValue(hash, out var entry))
            {
                entry.reference--;
-                if (entry.reference <= 0 || entry.storedObject == null)
+                if (entry.reference <= 0 || !entry.storedObject)
                {
                    Remove(entry);
                }
@@ -192,7 +192,7 @@ namespace Coffee.UIParticleInternal
            public void Release(Action<T> onRelease)
            {
                reference = 0;
-                if (storedObject != null)
+                if (storedObject)
                {
                    onRelease?.Invoke(storedObject);
                }
--- a/Packages/src/Runtime/UIParticle.cs
+++ b/Packages/src/Runtime/UIParticle.cs
@@ -3,13 +3,12 @@ using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using Coffee.UIParticleInternal;
 using UnityEngine;
-using UnityEngine.EventSystems;
 using UnityEngine.Rendering;
 using UnityEngine.Serialization;
+using UnityEngine.UI;
 using Random = UnityEngine.Random;

 [assembly: InternalsVisibleTo("Coffee.UIParticle.Editor")]
-[assembly: InternalsVisibleTo("Coffee.UIParticle.Editor.Tests")]
 [assembly: InternalsVisibleTo("Coffee.UIParticle.PerformanceDemo")]
 [assembly: InternalsVisibleTo("Coffee.UIParticle.Demo")]

@@ -18,11 +17,10 @@ namespace Coffee.UIExtensions
    /// <summary>
    /// Render maskable and sortable particle effect ,without Camera, RenderTexture or Canvas.
    /// </summary>
-    [Icon("Packages/com.coffee.ui-particle/Editor/UIParticleIcon.png")]
    [ExecuteAlways]
    [RequireComponent(typeof(RectTransform))]
    [RequireComponent(typeof(CanvasRenderer))]
-    public class UIParticle : UIBehaviour, ISerializationCallbackReceiver
+    public class UIParticle : MaskableGraphic, ISerializationCallbackReceiver
    {
        public enum AutoScalingMode
        {
@@ -64,7 +62,7 @@ namespace Coffee.UIExtensions

        [Tooltip("Scale the rendering particles. When the `3D` toggle is enabled, 3D scale (x, y, z) is supported.")]
        [SerializeField]
-        private Vector3 m_Scale3D = new Vector3(1, 1, 1);
+        private Vector3 m_Scale3D = new Vector3(10, 10, 10);

        [Tooltip("If you want to update material properties (e.g. _MainTex_ST, _Color) in AnimationClip, " +
                 "use this to mark as animatable.")]
@@ -121,52 +119,20 @@ namespace Coffee.UIExtensions
                 "Change the bake view size.")]
        private float m_CustomViewSize = 10;

-        [SerializeField]
-        [Tooltip("Time scale multiplier.")]
-        private float m_TimeScaleMultiplier = 1;
-
-        [SerializeField]
-        private bool m_Maskable = true;
-
        private readonly List<UIParticleRenderer> _renderers = new List<UIParticleRenderer>();
        private Camera _bakeCamera;
-        private Canvas _canvas;
        private int _groupId;
        private bool _isScaleStored;
        private Vector3 _storedScale;
        private DrivenRectTransformTracker _tracker;

-        public RectTransform rectTransform => transform as RectTransform;
-
-        public Canvas canvas
-        {
-            get
-            {
-                if (_canvas) return _canvas;
-
-                var tr = transform;
-                while (tr && !_canvas)
-                {
-                    if (tr.TryGetComponent(out _canvas)) return _canvas;
-                    tr = tr.parent;
-                }
-
-                return null;
-            }
-        }
-
        /// <summary>
-        /// Does this graphic allow masking.
+        /// Should this graphic be considered a target for ray-casting?
        /// </summary>
-        public bool maskable
+        public override bool raycastTarget
        {
-            get => m_Maskable;
-            set
-            {
-                if (value == m_Maskable) return;
-                m_Maskable = value;
-                UpdateRendererMaterial();
-            }
+            get => false;
+            set { }
        }

        /// <summary>
@@ -291,15 +257,6 @@ namespace Coffee.UIExtensions
            set => m_CustomViewSize = Mathf.Max(0.1f, value);
        }

-        /// <summary>
-        /// Time scale multiplier.
-        /// </summary>
-        public float timeScaleMultiplier
-        {
-            get => m_TimeScaleMultiplier;
-            set => m_TimeScaleMultiplier = value;
-        }
-
        internal bool useMeshSharing => m_MeshSharing != MeshSharing.None;

        internal bool isPrimary =>
@@ -352,15 +309,15 @@ namespace Coffee.UIExtensions

        public Vector3 parentScale { get; private set; }

-        private Vector3 canvasScale { get; set; }
+        public Vector3 canvasScale { get; private set; }

        protected override void OnEnable()
        {
            _isScaleStored = false;
            ResetGroupId();
            UIParticleUpdater.Register(this);
+            RegisterDirtyMaterialCallback(UpdateRendererMaterial);

-            //
            if (0 < particles.Count)
            {
                RefreshParticles(particles);
@@ -370,7 +327,7 @@ namespace Coffee.UIExtensions
                RefreshParticles();
            }

-            UpdateRendererMaterial();
+            base.OnEnable();
        }

        /// <summary>
@@ -387,15 +344,9 @@ namespace Coffee.UIExtensions
            _isScaleStored = false;
            UIParticleUpdater.Unregister(this);
            _renderers.ForEach(r => r.Reset());
-            _canvas = null;
-        }
+            UnregisterDirtyMaterialCallback(UpdateRendererMaterial);

-        /// <summary>
-        /// Called when the state of the parent Canvas is changed.
-        /// </summary>
-        protected override void OnCanvasHierarchyChanged()
-        {
-            _canvas = null;
+            base.OnDisable();
        }

        /// <summary>
@@ -405,14 +356,6 @@ namespace Coffee.UIExtensions
        {
        }

-        /// <summary>
-        /// This function is called when a direct or indirect parent of the transform of the GameObject has changed.
-        /// </summary>
-        protected override void OnTransformParentChanged()
-        {
-            _canvas = null;
-        }
-
        void ISerializationCallbackReceiver.OnBeforeSerialize()
        {
        }
@@ -513,7 +456,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (r == null || r.material == null) continue;
+                if (!r || !r.material) continue;
                result.Add(r.material);
            }
        }
@@ -531,7 +474,7 @@ namespace Coffee.UIExtensions
        /// </summary>
        public void SetParticleSystemInstance(GameObject instance, bool destroyOldParticles)
        {
-            if (instance == null) return;
+            if (!instance) return;

            var childCount = transform.childCount;
            for (var i = 0; i < childCount; i++)
@@ -560,7 +503,7 @@ namespace Coffee.UIExtensions
        /// </summary>
        public void SetParticleSystemPrefab(GameObject prefab)
        {
-            if (prefab == null) return;
+            if (!prefab) return;

            SetParticleSystemInstance(Instantiate(prefab.gameObject), true);
        }
@@ -580,14 +523,12 @@ namespace Coffee.UIExtensions
        /// </summary>
        private void RefreshParticles(GameObject root)
        {
-            if (root == null) return;
+            if (!root) return;
            root.GetComponentsInChildren(true, particles);
            for (var i = particles.Count - 1; 0 <= i; i--)
            {
                var ps = particles[i];
-                if (!ps
-                    || ps.gameObject.CompareTag("EditorOnly") // Ignore "EditorOnly" tagged ParticleSystems.
-                    || ps.GetComponentInParent<UIParticle>(true) != this) // Ignore ParticleSystems that are not under this UIParticle.
+                if (!ps || ps.GetComponentInParent<UIParticle>(true) != this)
                {
                    particles.RemoveAt(i);
                }
@@ -635,7 +576,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < particleSystems.Count; i++)
            {
                var ps = particleSystems[i];
-                if (ps == null) continue;
+                if (!ps) continue;

                var mainEmitter = ps.GetMainEmitter(particleSystems);
                GetRenderer(j++).Set(this, ps, false, mainEmitter);
@@ -686,7 +627,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (r != null) continue;
+                if (r) continue;

                RefreshParticles(particles);
                break;
@@ -696,7 +637,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (r == null) continue;
+                if (!r) continue;

                r.UpdateMesh(bakeCamera);
            }
@@ -709,12 +650,23 @@ namespace Coffee.UIExtensions
                : Random.Range(m_GroupId, m_GroupMaxId + 1);
        }

+        protected override void UpdateMaterial()
+        {
+        }
+
+        /// <summary>
+        /// Call to update the geometry of the Graphic onto the CanvasRenderer.
+        /// </summary>
+        protected override void UpdateGeometry()
+        {
+        }
+
        private void UpdateRendererMaterial()
        {
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (r == null) continue;
+                if (!r) continue;
                r.maskable = maskable;
                r.SetMaterialDirty();
            }
@@ -727,7 +679,7 @@ namespace Coffee.UIExtensions
                _renderers.Add(UIParticleRenderer.AddRenderer(this, index));
            }

-            if (_renderers[index] == null)
+            if (!_renderers[index])
            {
                _renderers[index] = UIParticleRenderer.AddRenderer(this, index);
            }
@@ -737,13 +689,13 @@ namespace Coffee.UIExtensions

        private Camera GetBakeCamera()
        {
-            if (canvas == null) return Camera.main;
+            if (!canvas) return Camera.main;
            if (!useCustomView && canvas.renderMode != RenderMode.ScreenSpaceOverlay && canvas.rootCanvas.worldCamera)
            {
                return canvas.rootCanvas.worldCamera;
            }

-            if (_bakeCamera != null)
+            if (_bakeCamera)
            {
                _bakeCamera.orthographicSize = useCustomView ? customViewSize : 10;
                return _bakeCamera;
@@ -762,7 +714,7 @@ namespace Coffee.UIExtensions
            }

            // Create baking camera.
-            if (_bakeCamera == null)
+            if (!_bakeCamera)
            {
                var go = new GameObject("[generated] UIParticle BakingCamera");
                go.SetActive(false);
--- a/Packages/src/Runtime/UIParticle.cs.meta
+++ b/Packages/src/Runtime/UIParticle.cs.meta
@@ -5,7 +5,7 @@ MonoImporter:
  serializedVersion: 2
  defaultReferences: []
  executionOrder: 0
-  icon: {instanceID: 0}
+  icon: {fileID: 2800000, guid: 5f0675613942149309588d556e33d990, type: 3}
  userData: 
  assetBundleName: 
  assetBundleVariant: 
--- a/Packages/src/Runtime/UIParticleAttractor.cs
+++ b/Packages/src/Runtime/UIParticleAttractor.cs
@@ -208,7 +208,7 @@ namespace Coffee.UIExtensions

        private Vector3 GetDestinationPosition(UIParticle uiParticle, ParticleSystem particleSystem)
        {
-            var isUI = uiParticle != null && uiParticle.enabled;
+            var isUI = uiParticle && uiParticle.enabled;
            var psPos = particleSystem.transform.position;
            var attractorPos = transform.position;
            var dstPos = attractorPos;
--- a/Packages/src/Runtime/UIParticleRenderer.cs
+++ b/Packages/src/Runtime/UIParticleRenderer.cs
@@ -15,7 +15,6 @@ using UnityEngine.UI;

 namespace Coffee.UIExtensions
 {
-    [Icon("Packages/com.coffee.ui-particle/Editor/UIParticleIcon.png")]
    [ExecuteAlways]
    [RequireComponent(typeof(RectTransform))]
    [RequireComponent(typeof(CanvasRenderer))]
@@ -55,7 +54,7 @@ namespace Coffee.UIExtensions
                s_Corners[1] = transform.TransformPoint(_lastBounds.min.x, _lastBounds.max.y, 0);
                s_Corners[2] = transform.TransformPoint(_lastBounds.max.x, _lastBounds.max.y, 0);
                s_Corners[3] = transform.TransformPoint(_lastBounds.max.x, _lastBounds.min.y, 0);
-                if (canvas != null)
+                if (canvas)
                {
                    var worldToLocalMatrix = canvas.rootCanvas.transform.worldToLocalMatrix;
                    for (var i = 0; i < 4; ++i)
@@ -95,7 +94,7 @@ namespace Coffee.UIExtensions
        {
            get
            {
-                if (_materialForRendering == null)
+                if (!_materialForRendering)
                {
                    _materialForRendering = base.materialForRendering;
                }
@@ -106,7 +105,7 @@ namespace Coffee.UIExtensions

        public void Reset(int index = -1)
        {
-            if (_renderer != null)
+            if (_renderer)
            {
                _renderer.enabled = true;
            }
@@ -121,7 +120,7 @@ namespace Coffee.UIExtensions
            }

            //_emitter = null;
-            if (isActiveAndEnabled)
+            if (this && isActiveAndEnabled)
            {
                material = null;
                canvasRenderer.Clear();
@@ -140,7 +139,7 @@ namespace Coffee.UIExtensions
            base.OnEnable();

            hideFlags = UIParticleProjectSettings.globalHideFlags;
-            if (s_CombineInstances[0].mesh == null)
+            if (!s_CombineInstances[0].mesh)
            {
                s_CombineInstances[0].mesh = new Mesh
                {
@@ -283,6 +282,10 @@ namespace Coffee.UIExtensions
                || !transform.lossyScale.GetScaled(_parent.scale3DForCalc).IsVisible() // Scale is not visible.
                || (!_particleSystem.IsAlive() && !_particleSystem.isPlaying) // No particle.
                || (_isTrail && !_particleSystem.trails.enabled) // Trail, but it is not enabled.
+#if UNITY_2018_3_OR_NEWER
+                || canvasRenderer.GetInheritedAlpha() <
+                0.01f // #102: Do not bake particle system to mesh when the alpha is zero.
+#endif
            )
            {
                Profiler.BeginSample("[UIParticleRenderer] Clear Mesh");
@@ -294,24 +297,6 @@ namespace Coffee.UIExtensions
                return;
            }

-            // Reset custom data.
-            // var customData = _particleSystem.customData;
-            // if (!customData.enabled || customData.GetMode(ParticleSystemCustomData.Custom1) == ParticleSystemCustomDataMode.Disabled)
-            // {
-            //     customData.SetVector(ParticleSystemCustomData.Custom1, 0, 0);
-            //     customData.SetVector(ParticleSystemCustomData.Custom1, 1, 0);
-            //     customData.SetVector(ParticleSystemCustomData.Custom1, 2, 0);
-            //     customData.SetVector(ParticleSystemCustomData.Custom1, 3, 0);
-            // }
-            //
-            // if (!customData.enabled || customData.GetMode(ParticleSystemCustomData.Custom2) == ParticleSystemCustomDataMode.Disabled)
-            // {
-            //     customData.SetVector(ParticleSystemCustomData.Custom2, 0, 0);
-            //     customData.SetVector(ParticleSystemCustomData.Custom2, 1, 0);
-            //     customData.SetVector(ParticleSystemCustomData.Custom2, 2, 0);
-            //     customData.SetVector(ParticleSystemCustomData.Custom2, 3, 0);
-            // }
-
            var main = _particleSystem.main;
            var scale = GetWorldScale();
            var psPos = _particleSystem.transform.position;
@@ -329,13 +314,6 @@ namespace Coffee.UIExtensions
 #endif
                {
                    ResolveResolutionChange(psPos, scale);
-
-                    // fix: second and subsequent bursts not displayed when world simulation and non-looping. (#326)
-                    if (!_particleSystem.IsLocalSpace() && !main.loop && _particleSystem.time == 0)
-                    {
-                        _delay = true;
-                    }
-
                    Simulate(scale, _parent.isPaused || _delay);

                    if (_delay && !_parent.isPaused)
@@ -648,9 +626,8 @@ namespace Coffee.UIExtensions
            var deltaTime = paused
                ? 0
                : main.useUnscaledTime
-                    ? Time.unscaledDeltaTime
+                    ? 0
                    : Time.deltaTime;
-            deltaTime *= _parent.timeScaleMultiplier;

            // Pre-warm:
            if (0 < deltaTime && _preWarm)
@@ -731,7 +708,7 @@ namespace Coffee.UIExtensions
            if (s_Mpb.isEmpty) return;

            // #41: Copy the value from MaterialPropertyBlock to CanvasRenderer
-            if (materialForRendering == null) return;
+            if (!materialForRendering) return;

            for (var i = 0; i < _parent.m_AnimatableProperties.Length; i++)
            {
--- a/Packages/src/Runtime/UIParticleRenderer.cs.meta
+++ b/Packages/src/Runtime/UIParticleRenderer.cs.meta
@@ -5,7 +5,7 @@ MonoImporter:
  serializedVersion: 2
  defaultReferences: []
  executionOrder: 0
-  icon: {instanceID: 0}
+  icon: {fileID: 2800000, guid: 5f0675613942149309588d556e33d990, type: 3}
  userData: 
  assetBundleName: 
  assetBundleVariant: 
--- a/Packages/src/Runtime/UIParticleUpdater.cs
+++ b/Packages/src/Runtime/UIParticleUpdater.cs
@@ -16,25 +16,25 @@ namespace Coffee.UIExtensions

        public static void Register(UIParticle particle)
        {
-            if (particle == null) return;
+            if (!particle) return;
            s_ActiveParticles.Add(particle);
        }

        public static void Unregister(UIParticle particle)
        {
-            if (particle == null) return;
+            if (!particle) return;
            s_ActiveParticles.Remove(particle);
        }

        public static void Register(UIParticleAttractor attractor)
        {
-            if (attractor == null) return;
+            if (!attractor) return;
            s_ActiveAttractors.Add(attractor);
        }

        public static void Unregister(UIParticleAttractor attractor)
        {
-            if (attractor == null) return;
+            if (!attractor) return;
            s_ActiveAttractors.Remove(attractor);
        }

@@ -71,7 +71,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < s_ActiveParticles.Count; i++)
            {
                var uip = s_ActiveParticles[i];
-                if (uip == null || uip.canvas == null || !uip.isPrimary || !s_UpdatedGroupIds.Add(uip.groupId)) continue;
+                if (!uip || !uip.canvas || !uip.isPrimary || !s_UpdatedGroupIds.Add(uip.groupId)) continue;

                uip.UpdateTransformScale();
                uip.UpdateRenderers();
@@ -81,7 +81,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < s_ActiveParticles.Count; i++)
            {
                var uip = s_ActiveParticles[i];
-                if (uip == null || uip.canvas == null) continue;
+                if (!uip || !uip.canvas) continue;

                uip.UpdateTransformScale();

@@ -125,7 +125,7 @@ namespace Coffee.UIExtensions
                var uip = s_ActiveParticles[i];
                if (!uip.useMeshSharing || uip.groupId != groupId) continue;
                if (uip.isPrimary) return uip;
-                if (primary == null && uip.canSimulate) primary = uip;
+                if (!primary && uip.canSimulate) primary = uip;
            }

            return primary;
--- a/Packages/src/Runtime/Utilities/ParticleSystemExtensions.cs
+++ b/Packages/src/Runtime/Utilities/ParticleSystemExtensions.cs
@@ -13,7 +13,11 @@ namespace Coffee.UIParticleInternal
        {
            if (s_TmpParticles.Length < size)
            {
-                size = Mathf.NextPowerOfTwo(size);
+                while (s_TmpParticles.Length < size)
+                {
+                    size = Mathf.NextPowerOfTwo(size);
+                }
+
                s_TmpParticles = new ParticleSystem.Particle[size];
            }

@@ -84,11 +88,11 @@ namespace Coffee.UIParticleInternal
                var bRenderer = b.GetComponent<ParticleSystemRenderer>();

                // Render queue: ascending
-                var aMat = aRenderer.sharedMaterial != null ? aRenderer.sharedMaterial : aRenderer.trailMaterial;
-                var bMat = bRenderer.sharedMaterial != null ? bRenderer.sharedMaterial : bRenderer.trailMaterial;
-                if (aMat == null && bMat == null) return 0;
-                if (aMat == null) return -1;
-                if (bMat == null) return 1;
+                var aMat = aRenderer.sharedMaterial ? aRenderer.sharedMaterial : aRenderer.trailMaterial;
+                var bMat = bRenderer.sharedMaterial ? bRenderer.sharedMaterial : bRenderer.trailMaterial;
+                if (!aMat && !bMat) return 0;
+                if (!aMat) return -1;
+                if (!bMat) return 1;

                if (sortByMaterial)
                {
@@ -142,7 +146,7 @@ namespace Coffee.UIParticleInternal

        public static Texture2D GetTextureForSprite(this ParticleSystem self)
        {
-            if (self == null) return null;
+            if (!self) return null;

            // Get sprite's texture.
            var tsaModule = self.textureSheetAnimation;
@@ -151,7 +155,7 @@ namespace Coffee.UIParticleInternal
            for (var i = 0; i < tsaModule.spriteCount; i++)
            {
                var sprite = tsaModule.GetSprite(i);
-                if (sprite == null) continue;
+                if (!sprite) continue;

                return sprite.GetActualTexture();
            }
@@ -163,14 +167,14 @@ namespace Coffee.UIParticleInternal
        {
            foreach (var p in self)
            {
-                if (p == null) continue;
+                if (!p) continue;
                action.Invoke(p);
            }
        }

        public static ParticleSystem GetMainEmitter(this ParticleSystem self, List<ParticleSystem> list)
        {
-            if (self == null || list == null || list.Count == 0) return null;
+            if (!self || list == null || list.Count == 0) return null;

            for (var i = 0; i < list.Count; i++)
            {
@@ -183,11 +187,7 @@ namespace Coffee.UIParticleInternal

        public static bool IsSubEmitterOf(this ParticleSystem self, ParticleSystem parent)
        {
-            if (self == null || parent == null) return false;
-
            var subEmitters = parent.subEmitters;
-            if (!subEmitters.enabled) return false; // No sub emitters.
-
            var count = subEmitters.subEmittersCount;
            for (var i = 0; i < count; i++)
            {
--- a/Packages/src/Samples~/Demo/Scripts/CopyItemOnStart.cs
+++ b/Packages/src/Samples~/Demo/Scripts/CopyItemOnStart.cs
@@ -15,7 +15,7 @@ namespace Coffee.UIExtensions.Demo

        private void Start()
        {
-            if (m_Origin == null) return;
+            if (!m_Origin) return;
            m_Origin.SetActive(false);

            var parent = m_Origin.transform.parent;
--- a/Packages/src/Samples~/Demo/Scripts/UIElementDragger.cs
+++ b/Packages/src/Samples~/Demo/Scripts/UIElementDragger.cs
@@ -42,7 +42,7 @@ public class UIElementDragger : MonoBehaviour, IBeginDragHandler, IDragHandler,
                break;
            case Target.Custom:
                _rectTransform.localPosition += delta;
-                if (m_CustomTarget != null)
+                if (m_CustomTarget)
                {
                    if (m_UseCanvasScale)
                    {
--- a/Packages/src/package.json
+++ b/Packages/src/package.json
@@ -2,8 +2,8 @@
  "name": "com.coffee.ui-particle",
  "displayName": "UI Particle",
  "description": "This package provides a component to render particle effects for uGUI.\nThe particle rendering is maskable and sortable, without the need for an extra Camera, RenderTexture, or Canvas.",
-  "version": "5.0.0-preview.16",
-  "unity": "2019.3",
+  "version": "4.10.7",
+  "unity": "2018.2",
  "license": "MIT",
  "repository": {
    "type": "git",