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128 lines
3.3 KiB
128 lines
3.3 KiB
/* |
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* Copyright (C) 2010 Daniel Nilsson |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package net.margaritov.preference.colorpicker; |
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import android.graphics.Bitmap; |
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import android.graphics.Bitmap.Config; |
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import android.graphics.Canvas; |
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import android.graphics.ColorFilter; |
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import android.graphics.Paint; |
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import android.graphics.Rect; |
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import android.graphics.drawable.Drawable; |
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/** |
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* This drawable that draws a simple white and gray chessboard pattern. |
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* It's pattern you will often see as a background behind a |
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* partly transparent image in many applications. |
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* @author Daniel Nilsson |
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*/ |
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public class AlphaPatternDrawable extends Drawable { |
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private int mRectangleSize = 10; |
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private Paint mPaint = new Paint(); |
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private Paint mPaintWhite = new Paint(); |
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private Paint mPaintGray = new Paint(); |
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private int numRectanglesHorizontal; |
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private int numRectanglesVertical; |
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/** |
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* Bitmap in which the pattern will be cahched. |
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*/ |
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private Bitmap mBitmap; |
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public AlphaPatternDrawable(int rectangleSize) { |
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mRectangleSize = rectangleSize; |
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mPaintWhite.setColor(0xffffffff); |
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mPaintGray.setColor(0xffcbcbcb); |
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} |
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@Override |
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public void draw(Canvas canvas) { |
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canvas.drawBitmap(mBitmap, null, getBounds(), mPaint); |
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} |
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@Override |
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public int getOpacity() { |
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return 0; |
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} |
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@Override |
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public void setAlpha(int alpha) { |
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throw new UnsupportedOperationException("Alpha is not supported by this drawwable."); |
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} |
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@Override |
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public void setColorFilter(ColorFilter cf) { |
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throw new UnsupportedOperationException("ColorFilter is not supported by this drawwable."); |
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} |
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@Override |
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protected void onBoundsChange(Rect bounds) { |
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super.onBoundsChange(bounds); |
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int height = bounds.height(); |
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int width = bounds.width(); |
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numRectanglesHorizontal = (int) Math.ceil((width / mRectangleSize)); |
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numRectanglesVertical = (int) Math.ceil(height / mRectangleSize); |
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generatePatternBitmap(); |
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} |
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/** |
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* This will generate a bitmap with the pattern |
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* as big as the rectangle we were allow to draw on. |
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* We do this to chache the bitmap so we don't need to |
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* recreate it each time draw() is called since it |
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* takes a few milliseconds. |
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*/ |
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private void generatePatternBitmap() { |
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if (getBounds().width() <= 0 || getBounds().height() <= 0) { |
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return; |
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} |
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mBitmap = Bitmap.createBitmap(getBounds().width(), getBounds().height(), Config.ARGB_8888); |
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Canvas canvas = new Canvas(mBitmap); |
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Rect r = new Rect(); |
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boolean verticalStartWhite = true; |
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for (int i = 0; i <= numRectanglesVertical; i++) { |
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boolean isWhite = verticalStartWhite; |
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for (int j = 0; j <= numRectanglesHorizontal; j++) { |
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r.top = i * mRectangleSize; |
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r.left = j * mRectangleSize; |
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r.bottom = r.top + mRectangleSize; |
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r.right = r.left + mRectangleSize; |
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canvas.drawRect(r, isWhite ? mPaintWhite : mPaintGray); |
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isWhite = !isWhite; |
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} |
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verticalStartWhite = !verticalStartWhite; |
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} |
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} |
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} |