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/*
* Copyright (C) 2014 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.launcher3;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
public class ClearCircleLayout extends View {
private static final String HOLE_LOCATION_PAGE_INDICATOR = "page_indicator";
private static final String HOLE_LOCATION_CENTER_SCREEN = "center_screen";
private static final int BACKGROUND_COLOR = 0x80000000;
private static float MIGRATION_WORKSPACE_INNER_CIRCLE_RADIUS_DPS = 42;
private static float MIGRATION_WORKSPACE_OUTER_CIRCLE_RADIUS_DPS = 46;
private final String mHoleLocation;
private final Paint mErasePaint;
private final Paint mBorderPaint;
private Launcher mLauncher;
private Point mHoleCenter;
private DisplayMetrics mMetrics;
public ClearCircleLayout(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ClearCircleLayout);
mHoleLocation = a.getString(R.styleable.ClearCircleLayout_holeLocation);
a.recycle();
mErasePaint = new Paint();
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
mErasePaint.setColor(0xFFFFFF);
mErasePaint.setAlpha(0);
mErasePaint.setAntiAlias(true);
mBorderPaint = new Paint();
mBorderPaint.setColor(0xFFFFFFFF);
mBorderPaint.setAntiAlias(true);
}
void initHole(Launcher launcher) {
mLauncher = launcher;
mMetrics = new DisplayMetrics();
launcher.getWindowManager().getDefaultDisplay().getMetrics(mMetrics);
if (mHoleLocation.endsWith(HOLE_LOCATION_PAGE_INDICATOR)) {
LauncherAppState app = LauncherAppState.getInstance();
DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
Rect indicator = grid.getWorkspacePageIndicatorBounds(new Rect());
mHoleCenter = new Point(indicator.centerX(), indicator.centerY());
} else if (mHoleLocation.endsWith(HOLE_LOCATION_CENTER_SCREEN)) {
mHoleCenter = new Point(mMetrics.widthPixels / 2, mMetrics.heightPixels / 2);
}
}
@Override
protected void dispatchDraw(Canvas canvas) {
if (mHoleCenter == null) {
canvas.drawColor(BACKGROUND_COLOR);
} else {
drawHole(canvas);
}
super.dispatchDraw(canvas);
}
private void drawHole(Canvas canvas) {
// Initialize the draw buffer (to allow punching through)
Bitmap eraseBg = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),
Bitmap.Config.ARGB_8888);
Canvas eraseCanvas = new Canvas(eraseBg);
eraseCanvas.drawColor(BACKGROUND_COLOR);
Rect insets = mLauncher.getDragLayer().getInsets();
float x = mHoleCenter.x - insets.left;
float y = mHoleCenter.y - insets.top;
// Draw the outer circle
eraseCanvas.drawCircle(x, y,
DynamicGrid.pxFromDp(MIGRATION_WORKSPACE_OUTER_CIRCLE_RADIUS_DPS, mMetrics),
mBorderPaint);
// Draw the inner circle
eraseCanvas.drawCircle(x, y,
DynamicGrid.pxFromDp(MIGRATION_WORKSPACE_INNER_CIRCLE_RADIUS_DPS, mMetrics),
mErasePaint);
canvas.drawBitmap(eraseBg, 0, 0, null);
eraseCanvas.setBitmap(null);
eraseBg.recycle();
}
}
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