1 files changed, 137 insertions, 0 deletions
diff --git a/src/com/android/launcher2/DimmableBubbleTextView.java b/src/com/android/launcher2/DimmableBubbleTextView.java
new file mode 100644
index 000000000..66cc97a1b
--- /dev/null
+++ b/src/com/android/launcher2/DimmableBubbleTextView.java
@@ -0,0 +1,137 @@
+/*
+ * 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.launcher2;
+
+import com.android.launcher.R;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.util.AttributeSet;
+
+public class DimmableBubbleTextView extends BubbleTextView {
+    private  Paint mDimmedPaint = new Paint();
+    private int mAlpha;
+    private int mDimmedAlpha;
+    private Bitmap mDimmedView;
+    private Canvas mDimmedViewCanvas;
+    private boolean isDimmedViewUpdatePass;
+
+    public DimmableBubbleTextView(Context context) {
+        super(context);
+        mDimmedPaint.setFilterBitmap(true);
+    }
+
+    public DimmableBubbleTextView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mDimmedPaint.setFilterBitmap(true);
+    }
+
+    public DimmableBubbleTextView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        mDimmedPaint.setFilterBitmap(true);
+    }
+
+    private static float cubic(float r) {
+        return (float) (Math.pow(r-1, 3) + 1);
+    }
+
+    /**
+     * Returns the interpolated holographic highlight alpha for the effect we want when scrolling
+     * pages.
+     */
+    public static float highlightAlphaInterpolator(float r) {
+        final float pivot = 0.3f;
+        if (r < pivot) {
+            return Math.max(0.5f, 0.65f*cubic(r/pivot));
+        } else {
+            return Math.min(1.0f, 0.65f*cubic(1 - (r-pivot)/(1-pivot)));
+        }
+    }
+
+    /**
+     * Returns the interpolated view alpha for the effect we want when scrolling pages.
+     */
+    public static float viewAlphaInterpolator(float r) {
+        final float pivot = 0.6f;
+        if (r < pivot) {
+            return r/pivot;
+        } else {
+            return 1.0f;
+        }
+    }
+
+    @Override
+    public boolean onSetAlpha(int alpha) {
+        super.onSetAlpha(alpha);
+        return true;
+    }
+
+    @Override
+    public void setAlpha(float alpha) {
+        final float viewAlpha = viewAlphaInterpolator(alpha);
+        final float dimmedAlpha = highlightAlphaInterpolator(alpha);
+        mAlpha = (int) (viewAlpha * 255);
+        mDimmedAlpha = (int) (dimmedAlpha * 255);
+        super.setAlpha(viewAlpha);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+
+        if (mDimmedView == null) {
+            isDimmedViewUpdatePass = true;
+            mDimmedView = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),
+                    Bitmap.Config.ARGB_8888);
+            mDimmedViewCanvas = new Canvas(mDimmedView);
+            mDimmedViewCanvas.concat(getMatrix());
+
+            draw(mDimmedViewCanvas);
+
+            // MAKE THE DIMMED VERSION
+            int dimmedColor = getContext().getResources().getColor(R.color.dimmed_view_color);
+            mDimmedViewCanvas.drawColor(dimmedColor, PorterDuff.Mode.SRC_IN);
+
+            isDimmedViewUpdatePass = false;
+        }
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (isDimmedViewUpdatePass) {
+            canvas.save();
+            final float alpha = getAlpha();
+            super.setAlpha(1.0f);
+            super.onDraw(canvas);
+            super.setAlpha(alpha);
+            canvas.restore();
+        } else {
+            if (mAlpha > 0) {
+                super.onDraw(canvas);
+            }
+        }
+
+        if (mDimmedView != null && mDimmedAlpha > 0) {
+            mDimmedPaint.setAlpha(mDimmedAlpha);
+            canvas.drawBitmap(mDimmedView, mScrollX, mScrollY, mDimmedPaint);
+        }
+    }
+}
+\ No newline at end of file