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/*
* Copyright (C) 2014 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 android.view;
import com.android.resources.Density;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
import android.graphics.Bitmap;
import android.graphics.Bitmap_Delegate;
import android.graphics.Canvas;
import android.graphics.Outline;
import android.graphics.Path_Delegate;
import android.graphics.Rect;
import android.graphics.Region.Op;
import android.view.animation.Transformation;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
/**
* Delegate used to provide new implementation of a select few methods of {@link ViewGroup}
* <p/>
* Through the layoutlib_create tool, the original methods of ViewGroup have been replaced by calls
* to methods of the same name in this delegate class.
*/
public class ViewGroup_Delegate {
/**
* Overrides the original drawChild call in ViewGroup to draw the shadow.
*/
@LayoutlibDelegate
/*package*/ static boolean drawChild(ViewGroup thisVG, Canvas canvas, View child,
long drawingTime) {
if (child.getZ() > thisVG.getZ()) {
// The background's bounds are set lazily. Make sure they are set correctly so that
// the outline obtained is correct.
child.setBackgroundBounds();
ViewOutlineProvider outlineProvider = child.getOutlineProvider();
if (outlineProvider != null) {
Outline outline = child.mAttachInfo.mTmpOutline;
outlineProvider.getOutline(child, outline);
if (outline.mPath != null || (outline.mRect != null && !outline.mRect.isEmpty())) {
int restoreTo = transformCanvas(thisVG, canvas, child);
drawShadow(thisVG, canvas, child, outline);
canvas.restoreToCount(restoreTo);
}
}
}
return thisVG.drawChild_Original(canvas, child, drawingTime);
}
private static void drawShadow(ViewGroup parent, Canvas canvas, View child,
Outline outline) {
float elevation = getElevation(child, parent);
if(outline.mMode == Outline.MODE_ROUND_RECT && outline.mRect != null) {
RectShadowPainter.paintShadow(outline, elevation, canvas);
return;
}
BufferedImage shadow = null;
if (outline.mPath != null) {
shadow = getPathShadow(outline, canvas, elevation);
}
if (shadow == null) {
return;
}
Bitmap bitmap = Bitmap_Delegate.createBitmap(shadow, false,
Density.getEnum(canvas.getDensity()));
Rect clipBounds = canvas.getClipBounds();
Rect newBounds = new Rect(clipBounds);
newBounds.inset((int)-elevation, (int)-elevation);
canvas.clipRect(newBounds, Op.REPLACE);
canvas.drawBitmap(bitmap, 0, 0, null);
canvas.clipRect(clipBounds, Op.REPLACE);
}
private static float getElevation(View child, ViewGroup parent) {
return child.getZ() - parent.getZ();
}
private static BufferedImage getPathShadow(Outline outline, Canvas canvas, float elevation) {
Rect clipBounds = canvas.getClipBounds();
if (clipBounds.isEmpty()) {
return null;
}
BufferedImage image = new BufferedImage(clipBounds.width(), clipBounds.height(),
BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = image.createGraphics();
graphics.draw(Path_Delegate.getDelegate(outline.mPath.mNativePath).getJavaShape());
graphics.dispose();
return ShadowPainter.createDropShadow(image, (int) elevation);
}
// Copied from android.view.View#draw(Canvas, ViewGroup, long) and removed code paths
// which were never taken. Ideally, we should hook up the shadow code in the same method so
// that we don't have to transform the canvas twice.
private static int transformCanvas(ViewGroup thisVG, Canvas canvas, View child) {
final int restoreTo = canvas.save();
final boolean childHasIdentityMatrix = child.hasIdentityMatrix();
int flags = thisVG.mGroupFlags;
Transformation transformToApply = null;
boolean concatMatrix = false;
if ((flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
final Transformation t = thisVG.getChildTransformation();
final boolean hasTransform = thisVG.getChildStaticTransformation(child, t);
if (hasTransform) {
final int transformType = t.getTransformationType();
transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null;
concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0;
}
}
concatMatrix |= childHasIdentityMatrix;
child.computeScroll();
int sx = child.mScrollX;
int sy = child.mScrollY;
canvas.translate(child.mLeft - sx, child.mTop - sy);
float alpha = child.getAlpha() * child.getTransitionAlpha();
if (transformToApply != null || alpha < 1 || !childHasIdentityMatrix) {
if (transformToApply != null || !childHasIdentityMatrix) {
int transX = -sx;
int transY = -sy;
if (transformToApply != null) {
if (concatMatrix) {
// Undo the scroll translation, apply the transformation matrix,
// then redo the scroll translate to get the correct result.
canvas.translate(-transX, -transY);
canvas.concat(transformToApply.getMatrix());
canvas.translate(transX, transY);
}
if (!childHasIdentityMatrix) {
canvas.translate(-transX, -transY);
canvas.concat(child.getMatrix());
canvas.translate(transX, transY);
}
}
}
}
return restoreTo;
}
}
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