1 files changed, 140 insertions, 0 deletions
diff --git a/src/com/android/browser/CircularProgressView.java b/src/com/android/browser/CircularProgressView.java
new file mode 100644
index 000000000..48f293a42
--- /dev/null
+++ b/src/com/android/browser/CircularProgressView.java
@@ -0,0 +1,140 @@
+
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.browser;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.widget.ImageButton;
+
+/**
+ *
+ */
+public class CircularProgressView extends ImageButton {
+
+    private static final int[] ALPHAS = {
+       64, 96, 128, 160, 192, 192, 160, 128, 96, 64
+    };
+
+    // 100 ms delay between frames, 10fps
+    private static int ALPHA_REFRESH_DELAY = 100;
+
+    private int     mEndAngle;
+    private int     mProgress;
+    private Paint   mPaint;
+    private int     mAlpha;
+    private boolean mAnimated;
+    private RectF   mRect;
+    private int     mMaxProgress;
+
+    /**
+     * @param context
+     * @param attrs
+     * @param defStyle
+     */
+    public CircularProgressView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context);
+    }
+
+    /**
+     * @param context
+     * @param attrs
+     */
+    public CircularProgressView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    /**
+     * @param context
+     */
+    public CircularProgressView(Context context) {
+        super(context);
+        init(context);
+    }
+
+    private void init(Context ctx) {
+        mEndAngle = 0;
+        mProgress = 0;
+        mMaxProgress = 100;
+        mPaint = new Paint();
+        mPaint.setAntiAlias(true);
+        mPaint.setColor(Color.BLACK);
+        mRect = new RectF();
+    }
+
+    void setMaxProgress(int max) {
+        mMaxProgress = max;
+    }
+
+    private synchronized boolean isAnimated() {
+        return mAnimated;
+    }
+
+    private synchronized void setAnimated(boolean animated) {
+        mAnimated = animated;
+    }
+
+    void setProgress(int progress) {
+        mProgress = progress;
+        mEndAngle = 360 * progress / mMaxProgress;
+        invalidate();
+        if (!isAnimated() && (progress > 0) && (progress < mMaxProgress)) {
+            setAnimated(true);
+            mAlpha = 0;
+            post(new Runnable() {
+                @Override
+                public void run() {
+                    if (isAnimated()) {
+                        mAlpha = (mAlpha + 1) % ALPHAS.length;
+                        mPaint.setAlpha(ALPHAS[mAlpha]);
+                        invalidate();
+                        postDelayed(this, ALPHA_REFRESH_DELAY);
+                    }
+                }
+            });
+        } else if ((progress <= 0) || (progress >= mMaxProgress))  {
+            setAnimated(false);
+        }
+    }
+
+    @Override
+    public void onDraw(Canvas canvas) {
+        int w = getWidth();
+        int h = getHeight();
+        float cx = w * 0.5f;
+        float cy = h * 0.5f;
+        mRect.set(0, 0, w, h);
+        if ((mProgress > 0) && (mProgress < mMaxProgress)) {
+            Path p = new Path();
+            p.moveTo(cx, cy);
+            p.lineTo(cx, 0);
+            p.arcTo(mRect, 270, mEndAngle);
+            p.lineTo(cx, cy);
+            int state = canvas.save();
+            canvas.drawPath(p, mPaint);
+            canvas.restoreToCount(state);
+        }
+        super.onDraw(canvas);
+    }
+
+}