/*
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* Copyright (C) 2008 Romain Guy
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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 com.demo.lib.common.drawable;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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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.PixelFormat;
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import android.graphics.PorterDuff;
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import android.graphics.PorterDuffXfermode;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.view.View;
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import android.view.ViewGroup;
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import com.lcjian.lcjianlibrary.R;
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public class SpotlightDrawable extends Drawable {
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private final Bitmap mBitmap;
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private final Paint mPaint;
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private final ViewGroup mView;
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private boolean mOffsetDisabled;
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private boolean mBlockSetBounds;
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private Drawable mParent;
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public SpotlightDrawable(Context context, ViewGroup view) {
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this(context, view, R.drawable.spotlight);
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}
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public SpotlightDrawable(Context context, ViewGroup view, int resource) {
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mView = view;
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mBitmap = BitmapFactory.decodeResource(context.getResources(), resource);
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mPaint = new Paint();
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mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
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}
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public void draw(Canvas canvas) {
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if (mView.hasWindowFocus()) {
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final Rect bounds = getBounds();
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canvas.save();
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canvas.drawBitmap(mBitmap, bounds.left, bounds.top, mPaint);
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}
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}
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@Override
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public void setBounds(int left, int top, int right, int bottom) {
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if (mBlockSetBounds) return;
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if (!mOffsetDisabled) {
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final int width = getIntrinsicWidth();
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final View view = mView.getChildAt(0);
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if (view != null) left -= (width - view.getWidth()) / 2.0f;
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right = left + width;
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bottom = top + getIntrinsicHeight();
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} else {
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right = left + getIntrinsicWidth();
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bottom = top + getIntrinsicHeight();
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}
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super.setBounds(left, top, right, bottom);
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if (mParent != null) {
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mBlockSetBounds = true;
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mParent.setBounds(left, top, right, bottom);
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mBlockSetBounds = false;
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}
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}
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public void setParent(Drawable drawable) {
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mParent = drawable;
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}
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@Override
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protected boolean onStateChange(int[] state) {
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invalidateSelf();
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return super.onStateChange(state);
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}
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public void setAlpha(int alpha) {
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mPaint.setAlpha(alpha);
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}
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public void setColorFilter(ColorFilter cf) {
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mPaint.setColorFilter(cf);
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}
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public int getOpacity() {
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return PixelFormat.TRANSLUCENT;
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}
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@Override
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public int getIntrinsicWidth() {
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return mBitmap.getWidth();
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}
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@Override
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public int getIntrinsicHeight() {
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return mBitmap.getHeight();
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}
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public void disableOffset() {
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mOffsetDisabled = true;
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}
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}
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