应用源码之animation1(.zip

package com.test; 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); } public void addView(View child) { if (getChildCount() > 1) { throw new IllegalStateException("PictureLayout can host only one direct child"); } super.addView(child); } public void addView(View child, int index) { if (getChildCount() > 1) { throw new IllegalStateException("PictureLayout can host only one direct child"); } super.addView(child, index); } public void addView(View child, LayoutParams params) { if (getChildCount() > 1) { throw new IllegalStateException("PictureLayout can host only one direct child"); } super.addView(child, params); } 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); } protected LayoutParams generateDefaultLayoutParams() { return new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); } 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(); } 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); } } public ViewParent invalidateChildInParent(int[] location, Rect dirty) { location[0] = getLeft(); location[1] = getTop(); dirty.set(0, 0, getWidth(), getHeight()); return getParent(); } 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()); } } } }