| /* |
| * Copyright (C) 2008 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.example.android.apis.graphics; |
| |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Picture; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.ViewParent; |
| |
| |
| public class PictureLayout extends ViewGroup { |
| private final Picture mPicture = new Picture(); |
| |
| public PictureLayout(Context context) { |
| super(context); |
| } |
| |
| public PictureLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| @Override |
| public void addView(View child) { |
| if (getChildCount() > 1) { |
| throw new IllegalStateException("PictureLayout can host only one direct child"); |
| } |
| |
| super.addView(child); |
| } |
| |
| @Override |
| public void addView(View child, int index) { |
| if (getChildCount() > 1) { |
| throw new IllegalStateException("PictureLayout can host only one direct child"); |
| } |
| |
| super.addView(child, index); |
| } |
| |
| @Override |
| public void addView(View child, LayoutParams params) { |
| if (getChildCount() > 1) { |
| throw new IllegalStateException("PictureLayout can host only one direct child"); |
| } |
| |
| super.addView(child, params); |
| } |
| |
| @Override |
| public void addView(View child, int index, LayoutParams params) { |
| if (getChildCount() > 1) { |
| throw new IllegalStateException("PictureLayout can host only one direct child"); |
| } |
| |
| super.addView(child, index, params); |
| } |
| |
| @Override |
| protected LayoutParams generateDefaultLayoutParams() { |
| return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| final int count = getChildCount(); |
| |
| int maxHeight = 0; |
| int maxWidth = 0; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| measureChild(child, widthMeasureSpec, heightMeasureSpec); |
| } |
| } |
| |
| maxWidth += getPaddingLeft() + getPaddingRight(); |
| maxHeight += getPaddingTop() + getPaddingBottom(); |
| |
| Drawable drawable = getBackground(); |
| if (drawable != null) { |
| maxHeight = Math.max(maxHeight, drawable.getMinimumHeight()); |
| maxWidth = Math.max(maxWidth, drawable.getMinimumWidth()); |
| } |
| |
| setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec), |
| resolveSize(maxHeight, heightMeasureSpec)); |
| } |
| |
| private void drawPict(Canvas canvas, int x, int y, int w, int h, |
| float sx, float sy) { |
| canvas.save(); |
| canvas.translate(x, y); |
| canvas.clipRect(0, 0, w, h); |
| canvas.scale(0.5f, 0.5f); |
| canvas.scale(sx, sy, w, h); |
| canvas.drawPicture(mPicture); |
| canvas.restore(); |
| } |
| |
| @Override |
| protected void dispatchDraw(Canvas canvas) { |
| super.dispatchDraw(mPicture.beginRecording(getWidth(), getHeight())); |
| mPicture.endRecording(); |
| |
| int x = getWidth()/2; |
| int y = getHeight()/2; |
| |
| if (false) { |
| canvas.drawPicture(mPicture); |
| } else { |
| drawPict(canvas, 0, 0, x, y, 1, 1); |
| drawPict(canvas, x, 0, x, y, -1, 1); |
| drawPict(canvas, 0, y, x, y, 1, -1); |
| drawPict(canvas, x, y, x, y, -1, -1); |
| } |
| } |
| |
| @Override |
| public ViewParent invalidateChildInParent(int[] location, Rect dirty) { |
| location[0] = getLeft(); |
| location[1] = getTop(); |
| dirty.set(0, 0, getWidth(), getHeight()); |
| return getParent(); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| final int count = super.getChildCount(); |
| |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| final int childLeft = getPaddingLeft(); |
| final int childTop = getPaddingTop(); |
| child.layout(childLeft, childTop, |
| childLeft + child.getMeasuredWidth(), |
| childTop + child.getMeasuredHeight()); |
| |
| } |
| } |
| } |
| } |