From 3484638cad97e255a412b0489a63873fb3ca4218 Mon Sep 17 00:00:00 2001
From: Sunny Goyal <sunnygoyal@google.com>
Date: Wed, 9 Jul 2014 00:09:28 -0700
Subject: Adding a circular progress bar for preloader icons

Change-Id: I1b5ba61c01a16a8cb5d3f9e31f827f8c99a1ffc9
---
 src/com/android/launcher3/PreloadIconDrawable.java | 168 +++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 src/com/android/launcher3/PreloadIconDrawable.java

(limited to 'src/com/android/launcher3/PreloadIconDrawable.java')

diff --git a/src/com/android/launcher3/PreloadIconDrawable.java b/src/com/android/launcher3/PreloadIconDrawable.java
new file mode 100644
index 000000000..d9365cc1f
--- /dev/null
+++ b/src/com/android/launcher3/PreloadIconDrawable.java
@@ -0,0 +1,168 @@
+package com.android.launcher3;
+
+import android.animation.ObjectAnimator;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.drawable.Drawable;
+
+class PreloadIconDrawable extends Drawable {
+    private static final float ANIMATION_PROGRESS_STOPPED = -1.0f;
+    private static final float ANIMATION_PROGRESS_STARTED = 0f;
+    private static final float ANIMATION_PROGRESS_COMPLETED = 1.0f;
+
+    private static final float ICON_SCALE_FACTOR = 0.6f;
+
+    private static Bitmap sProgressBg, sProgressFill;
+
+    private final Rect mCanvasClipRect = new Rect();
+    private final RectF mRect = new RectF();
+    private final Path mProgressPath = new Path();
+    private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
+
+    final Drawable mIcon;
+
+    /**
+     * Indicates the progress of the preloader [0-100]. If it goes above 100, only the icon
+     * is shown with no progress bar.
+     */
+    private int mProgress = 0;
+    private boolean mPathChanged;
+
+    private float mAnimationProgress = ANIMATION_PROGRESS_STOPPED;
+    private ObjectAnimator mAnimator;
+
+    public PreloadIconDrawable(Drawable icon, Resources res) {
+        mIcon = icon;
+
+        setBounds(icon.getBounds());
+        mPathChanged = false;
+
+        if (sProgressBg == null) {
+            sProgressBg = BitmapFactory.decodeResource(res, R.drawable.bg_preloader);
+        }
+        if (sProgressFill == null) {
+            sProgressFill = BitmapFactory.decodeResource(res, R.drawable.bg_preloader_progress);
+        }
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        final Rect r = getBounds();
+        if (canvas.getClipBounds(mCanvasClipRect) && !Rect.intersects(mCanvasClipRect, r)) {
+            // The draw region has been clipped.
+            return;
+        }
+        final float iconScale;
+
+        if ((mAnimationProgress >= ANIMATION_PROGRESS_STARTED)
+                && (mAnimationProgress < ANIMATION_PROGRESS_COMPLETED)) {
+            mPaint.setAlpha((int) ((1 - mAnimationProgress) * 255));
+            canvas.drawBitmap(sProgressBg, null, r, mPaint);
+            canvas.drawBitmap(sProgressFill, null, r, mPaint);
+            iconScale = ICON_SCALE_FACTOR + (1 - ICON_SCALE_FACTOR) * mAnimationProgress;
+
+        } else if (mAnimationProgress == ANIMATION_PROGRESS_STOPPED) {
+            mPaint.setAlpha(255);
+            iconScale = ICON_SCALE_FACTOR;
+            canvas.drawBitmap(sProgressBg, null, r, mPaint);
+
+            if (mProgress >= 100) {
+                canvas.drawBitmap(sProgressFill, null, r, mPaint);
+            } else if (mProgress > 0) {
+                if (mPathChanged) {
+                    mProgressPath.reset();
+                    mProgressPath.moveTo(r.exactCenterX(), r.centerY());
+
+                    mRect.set(r);
+                    mProgressPath.arcTo(mRect, -90, mProgress * 3.6f);
+                    mProgressPath.close();
+                    mPathChanged = false;
+                }
+
+                canvas.save();
+                canvas.clipPath(mProgressPath);
+                canvas.drawBitmap(sProgressFill, null, r, mPaint);
+                canvas.restore();
+            }
+        } else {
+            iconScale = 1;
+        }
+
+        canvas.save();
+        canvas.scale(iconScale, iconScale, r.exactCenterX(), r.exactCenterY());
+        mIcon.draw(canvas);
+        canvas.restore();
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        mIcon.setBounds(bounds);
+        mPathChanged = true;
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        mIcon.setAlpha(alpha);
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter cf) {
+        mIcon.setColorFilter(cf);
+    }
+
+    @Override
+    protected boolean onLevelChange(int level) {
+        mProgress = level;
+        mPathChanged = true;
+
+        // Stop Animation
+        if (mAnimator != null) {
+            mAnimator.cancel();
+            mAnimator = null;
+        }
+        mAnimationProgress = ANIMATION_PROGRESS_STOPPED;
+
+        invalidateSelf();
+        return true;
+    }
+
+    /**
+     * Runs the finish animation if it is has not been run after last level change.
+     */
+    public void maybePerformFinishedAnimation() {
+        if (mAnimationProgress > ANIMATION_PROGRESS_STOPPED) {
+            return;
+        }
+        if (mAnimator != null) {
+            mAnimator.cancel();
+        }
+        setAnimationProgress(ANIMATION_PROGRESS_STARTED);
+        mAnimator = ObjectAnimator.ofFloat(this, "animationProgress",
+                ANIMATION_PROGRESS_STARTED, ANIMATION_PROGRESS_COMPLETED);
+        mAnimator.start();
+    }
+
+    public void setAnimationProgress(float progress) {
+        if (progress != mAnimationProgress) {
+            mAnimationProgress = progress;
+            invalidateSelf();
+        }
+    }
+
+    public float getAnimationProgress() {
+        return mAnimationProgress;
+    }
+}
-- 
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