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/*
* Copyright (C) 2019 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.graphics;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
/**
* A simple drawable which draws a bitmap at a fixed position irrespective of the bounds
*/
public class ShiftedBitmapDrawable extends Drawable {
private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
private final Bitmap mBitmap;
private float mShiftX;
private float mShiftY;
private final ConstantState mConstantState;
public ShiftedBitmapDrawable(Bitmap bitmap, float shiftX, float shiftY) {
mBitmap = bitmap;
mShiftX = shiftX;
mShiftY = shiftY;
mConstantState = new MyConstantState(mBitmap, mShiftX, mShiftY);
}
public float getShiftX() {
return mShiftX;
}
public float getShiftY() {
return mShiftY;
}
public void setShiftX(float shiftX) {
mShiftX = shiftX;
}
public void setShiftY(float shiftY) {
mShiftY = shiftY;
}
@Override
public void draw(Canvas canvas) {
canvas.drawBitmap(mBitmap, mShiftX, mShiftY, mPaint);
}
@Override
public void setAlpha(int i) { }
@Override
public void setColorFilter(ColorFilter colorFilter) {
mPaint.setColorFilter(colorFilter);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public ConstantState getConstantState() {
return mConstantState;
}
private static class MyConstantState extends ConstantState {
private final Bitmap mBitmap;
private float mShiftX;
private float mShiftY;
MyConstantState(Bitmap bitmap, float shiftX, float shiftY) {
mBitmap = bitmap;
mShiftX = shiftX;
mShiftY = shiftY;
}
@Override
public Drawable newDrawable() {
return new ShiftedBitmapDrawable(mBitmap, mShiftX, mShiftY);
}
@Override
public int getChangingConfigurations() {
return 0;
}
}
}
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