1 files changed, 164 insertions, 0 deletions
diff --git a/src/com/android/bitmap/drawable/TileDrawable.java b/src/com/android/bitmap/drawable/TileDrawable.java
new file mode 100644
index 0000000..40d3e16
--- /dev/null
+++ b/src/com/android/bitmap/drawable/TileDrawable.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2013 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.bitmap.drawable;
+
+import android.animation.ValueAnimator;
+import android.animation.ValueAnimator.AnimatorUpdateListener;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+
+/**
+ * A drawable that wraps another drawable and places it in the center of this space. This drawable
+ * allows a background color for the "tile", and has a fade-out transition when
+ * {@link #setVisible(boolean, boolean)} indicates that it is no longer visible.
+ */
+public class TileDrawable extends Drawable implements Drawable.Callback {
+
+    private final Paint mPaint = new Paint();
+    private final Drawable mInner;
+    private final int mInnerWidth;
+    private final int mInnerHeight;
+
+    protected final ValueAnimator mFadeOutAnimator;
+
+    public TileDrawable(Drawable inner, int innerWidth, int innerHeight,
+            int backgroundColor, int fadeOutDurationMs) {
+        mInner = inner.mutate();
+        mInnerWidth = innerWidth;
+        mInnerHeight = innerHeight;
+        mPaint.setColor(backgroundColor);
+        mInner.setCallback(this);
+
+        mFadeOutAnimator = ValueAnimator.ofInt(255, 0)
+                .setDuration(fadeOutDurationMs);
+        mFadeOutAnimator.addUpdateListener(new AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator animation) {
+                setAlpha((Integer) animation.getAnimatedValue());
+            }
+        });
+
+        reset();
+    }
+
+    public void reset() {
+        setAlpha(0);
+        setVisible(false);
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        super.onBoundsChange(bounds);
+
+        if (bounds.isEmpty()) {
+            mInner.setBounds(0, 0, 0, 0);
+        } else {
+            final int l = bounds.left + (bounds.width() / 2) - (mInnerWidth / 2);
+            final int t = bounds.top + (bounds.height() / 2) - (mInnerHeight / 2);
+            mInner.setBounds(l, t, l + mInnerWidth, t + mInnerHeight);
+        }
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        if (!isVisible() && mPaint.getAlpha() == 0) {
+            return;
+        }
+        canvas.drawRect(getBounds(), mPaint);
+        mInner.draw(canvas);
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        final int old = mPaint.getAlpha();
+        mPaint.setAlpha(alpha);
+        setInnerAlpha(alpha);
+        if (alpha != old) {
+            invalidateSelf();
+        }
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter cf) {
+        mPaint.setColorFilter(cf);
+        mInner.setColorFilter(cf);
+    }
+
+    @Override
+    public int getOpacity() {
+        return 0;
+    }
+
+    protected int getCurrentAlpha() {
+        return mPaint.getAlpha();
+    }
+
+    public boolean setVisible(boolean visible) {
+        return setVisible(visible, true /* dontcare */);
+    }
+
+    @Override
+    public boolean setVisible(boolean visible, boolean restart) {
+        mInner.setVisible(visible, restart);
+        final boolean changed = super.setVisible(visible, restart);
+        if (changed) {
+            if (isVisible()) {
+                // pop in (no-op)
+                // the transition will still be smooth if the previous state's layer fades out
+                mFadeOutAnimator.cancel();
+                setAlpha(255);
+            } else {
+                // fade out
+                if (mPaint.getAlpha() == 255 && !getBounds().isEmpty()) {
+                    mFadeOutAnimator.start();
+                }
+            }
+        }
+        return changed;
+    }
+
+    @Override
+    protected boolean onLevelChange(int level) {
+        return mInner.setLevel(level);
+    }
+
+    /**
+     * Changes the alpha on just the inner wrapped drawable.
+     */
+    public void setInnerAlpha(int alpha) {
+        mInner.setAlpha(alpha);
+    }
+
+    @Override
+    public void invalidateDrawable(Drawable who) {
+        invalidateSelf();
+    }
+
+    @Override
+    public void scheduleDrawable(Drawable who, Runnable what, long when) {
+        scheduleSelf(what, when);
+    }
+
+    @Override
+    public void unscheduleDrawable(Drawable who, Runnable what) {
+        unscheduleSelf(what);
+    }
+
+}