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/*
* 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.view.View;
public class DimmableAppWidgetHostView extends LauncherAppWidgetHostView {
public DimmableAppWidgetHostView(Context context) {
super(context);
mPaint.setFilterBitmap(true);
}
private final Paint mPaint = new Paint();
private int mAlpha;
private int mDimmedAlpha;
private Bitmap mDimmedView;
private Canvas mDimmedViewCanvas;
private boolean isDimmedViewUpdatePass;
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;
}
}
private void setChildAlpha(float alpha) {
if (getChildCount() > 0) {
final View child = getChildAt(0);
if (child.getAlpha() != alpha) {
getChildAt(0).setAlpha(alpha);
}
}
}
private void updateChildAlpha() {
// hacky, but sometimes widgets get their alpha set back to 1.0f, so we call
// this to force them back
setChildAlpha(getAlpha());
}
@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);
setChildAlpha(viewAlpha);
}
private void updateDimmedView() {
if (mDimmedView == null) {
mDimmedView = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),
Bitmap.Config.ARGB_8888);
mDimmedViewCanvas = new Canvas(mDimmedView);
}
mDimmedViewCanvas.drawColor(0x00000000);
mDimmedViewCanvas.concat(getMatrix());
isDimmedViewUpdatePass = true;
draw(mDimmedViewCanvas);
// make the bitmap look "dimmed"
int dimmedColor = getContext().getResources().getColor(R.color.dimmed_view_color);
mDimmedViewCanvas.drawColor(dimmedColor, PorterDuff.Mode.SRC_IN);
isDimmedViewUpdatePass = false;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (mDimmedView == null && mDimmedAlpha > 0.0f) {
updateDimmedView();
}
}
@Override
public void dispatchDraw(Canvas canvas) {
if (isDimmedViewUpdatePass) {
final float alpha = getAlpha();
canvas.save();
setAlpha(1.0f);
super.dispatchDraw(canvas);
canvas.restore();
setAlpha(alpha);
} else {
if (mDimmedView != null && mDimmedAlpha > 0) {
// draw the dimmed version of this widget
mPaint.setAlpha(mDimmedAlpha);
canvas.drawBitmap(mDimmedView, 0, 0, mPaint);
}
updateChildAlpha();
super.dispatchDraw(canvas);
}
}
}
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