From 0c16b1a3d99a12db6f6a43183592d445e434900c Mon Sep 17 00:00:00 2001
From: Alex Hua <sealexh@gmail.com>
Date: Wed, 12 Feb 2025 21:02:26 +0800
Subject: [PATCH] feat: Add pause animation

1. Display pause icon animation when all tasks are paused
2. Refine the animation transition logic
---
 background.js                       |  3 ++
 js/IconUtils/Animation.js           | 45 ++++++++++++++++++++++++++++-
 js/IconUtils/AnimationController.js | 15 ++++++----
 js/IconUtils/TransitionManager.js   | 22 ++++++--------
 4 files changed, 65 insertions(+), 20 deletions(-)

diff --git a/background.js b/background.js
index f960668..97b3aa0 100644
--- a/background.js
+++ b/background.js
@@ -721,6 +721,9 @@ async function monitorAria2() {
             enableMonitor();
         }
         chrome.power.releaseKeepAwake();
+        if (waiting > 0) {
+            IconAnimController.start('Pause');
+        }
     }
 
     let bgColor = 'green', textColor = 'white', text = '', title = '';
diff --git a/js/IconUtils/Animation.js b/js/IconUtils/Animation.js
index 882981c..0e45a93 100644
--- a/js/IconUtils/Animation.js
+++ b/js/IconUtils/Animation.js
@@ -36,7 +36,6 @@ class BaseAnimation {
     this.ctx.globalAlpha = alpha;
     this.ctx.scale(this.scaleFactor, this.scaleFactor);
     this.render();
-    this.ctx.globalAlpha = 1;
     this.frameId = (this.frameId + 1) % this.totalFrames;
     this.ctx.restore();
     return this.canvas.getImageData();
@@ -277,4 +276,48 @@ export class ProgressAnimation extends BaseAnimation {
     this.#drawProgressCircle();
     this.#drawArrow();
   }
+}
+
+export class PauseAnimation extends BaseAnimation {
+  constructor() {
+    super();
+    this.duration = 3010;
+    this.colors = [
+      [0, '#4FC3F7'],    // Light blue
+      [0.5, '#2196F3'],  // Medium blue
+      [1, '#1976D2']     // Dark blue   
+    ];
+  }
+
+  render() {
+
+    // Draw circle
+    this.ctx.beginPath();
+    this.ctx.lineWidth = 1.5;
+    this.ctx.strokeStyle = 'rgba(33, 150, 243, .6)';
+    this.ctx.arc(8, 8, 7, 0, Math.PI * 2);
+    this.ctx.stroke();
+
+    // set round conner
+    this.ctx.lineCap = 'round';
+    this.ctx.lineJoin = 'round';
+
+    // Draw pause symbol
+    this.addShadow('rgba(3, 169, 244, 0.2)', 1);
+    const gradient = this.createGradient(this.colors, 0, 0, 16, 16);
+    this.ctx.strokeStyle = gradient;
+    this.ctx.lineWidth = 1.5;
+
+    // left line
+    this.ctx.beginPath();
+    this.ctx.moveTo(6.75, 5);
+    this.ctx.lineTo(6.75, 11);
+    this.ctx.stroke();
+
+    // right line
+    this.ctx.beginPath();
+    this.ctx.moveTo(9.25, 5);
+    this.ctx.lineTo(9.25, 11);
+    this.ctx.stroke();
+  }
 }
\ No newline at end of file
diff --git a/js/IconUtils/AnimationController.js b/js/IconUtils/AnimationController.js
index 6bdeb0b..3102ee3 100644
--- a/js/IconUtils/AnimationController.js
+++ b/js/IconUtils/AnimationController.js
@@ -1,4 +1,4 @@
-import { DownloadAnimation, CompleteAnimation, ErrorAnimation, ProgressAnimation } from './Animation.js';
+import { DownloadAnimation, CompleteAnimation, ErrorAnimation, ProgressAnimation, PauseAnimation } from './Animation.js';
 import { FRAME_INTERVAL, FADE_INTERVAL } from './Constants.js';
 import { IconManager } from './IconManager.js';
 import { TransitionManager } from './TransitionManager.js';
@@ -18,6 +18,9 @@ export class AnimationController {
       case 'Download':
         newAnimation = new DownloadAnimation();
         break;
+      case 'Pause':
+        newAnimation = new PauseAnimation();
+        break;
       case 'Complete':
         newAnimation = new CompleteAnimation();
         break;
@@ -39,13 +42,13 @@ export class AnimationController {
         throw new Error(`AnimationController: Invalid animation type: ${type}`);
     }
 
-    if (this.transitionManager.currentAnimation &&
-      this.transitionManager.currentAnimation != this.progressAnimation) {
-      const currentAnimation = this.transitionManager.isTransitioning ?
-        this.transitionManager.nextAnimation : this.transitionManager.currentAnimationAnimation;
+    const currentAnimation = this.transitionManager.isTransitioning ?
+      this.transitionManager.nextAnimation : this.transitionManager.currentAnimation;
 
+    // Start transition between different animation
+    if (currentAnimation?.constructor !== newAnimation.constructor) {
       this.transitionManager.startTransition(currentAnimation, newAnimation);
-    } else {
+    } else if (!this.transitionManager.isTransitioning) {
       this.transitionManager.currentAnimation = newAnimation;
     }
 
diff --git a/js/IconUtils/TransitionManager.js b/js/IconUtils/TransitionManager.js
index df33e9c..b9ff3ce 100644
--- a/js/IconUtils/TransitionManager.js
+++ b/js/IconUtils/TransitionManager.js
@@ -41,26 +41,22 @@ export class TransitionManager {
   }
 
   #blend(progress) {
-    const canvas1 = new Canvas();
-    const canvas2 = new Canvas();
+    const ctx = this.canvas.getContext();
+
+    this.canvas.clear();
 
     if (this.currentAnimation) {
-      canvas1.ctx.putImageData(this.currentAnimation.draw(), 0, 0);
+      this.currentAnimation.draw();
+      ctx.globalAlpha = 1 - progress;
+      ctx.drawImage(this.currentAnimation.canvas.getCanvas(), 0, 0);
     }
 
     if (this.nextAnimation) {
-      canvas2.ctx.putImageData(this.nextAnimation.draw(), 0, 0);
+      this.nextAnimation.draw();
+      ctx.globalAlpha = progress;
+      ctx.drawImage(this.nextAnimation.canvas.getCanvas(), 0, 0);
     }
 
-    this.canvas.clear();
-    const ctx = this.canvas.getContext();
-
-    ctx.globalAlpha = 1 - progress;
-    ctx.drawImage(canvas1.getCanvas(), 0, 0);
-    ctx.globalAlpha = progress;
-    ctx.drawImage(canvas2.getCanvas(), 0, 0);
-    ctx.globalAlpha = 1;
-
     return this.canvas.getImageData();
   }
 }
\ No newline at end of file