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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.annotations.NonNull;
import com.android.layoutlib.bridge.android.BridgeContext;
import com.android.resources.Density;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
import android.content.Context;
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.util.DisplayMetrics;
import android.util.TypedValue;
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* Through the layoutlib_create tool, the original methods of ViewGroup have been replaced by calls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) {
boolean retVal = thisVG.drawChild_Original(canvas, child, drawingTime);
if (child.getZ() > thisVG.getZ()) {
ViewOutlineProvider outlineProvider = child.getOutlineProvider();
Outline outline = new Outline();
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 retVal;
}
private static void drawShadow(ViewGroup parent, Canvas canvas, View child,
Outline outline) {
BufferedImage shadow = null;
int x = 0;
if (outline.mRect != null) {
Shadow s = getRectShadow(parent, canvas, child, outline);
if (s != null) {
shadow = s.mShadow;
x = -s.mShadowWidth;
}
} else if (outline.mPath != null) {
shadow = getPathShadow(child, outline, canvas);
}
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.left = newBounds.left + x;
canvas.clipRect(newBounds, Op.REPLACE);
canvas.drawBitmap(bitmap, x, 0, null);
canvas.clipRect(clipBounds, Op.REPLACE);
}
private static Shadow getRectShadow(ViewGroup parent, Canvas canvas, View child,
Outline outline) {
BufferedImage shadow;
Rect clipBounds = canvas.getClipBounds();
if (clipBounds.isEmpty()) {
return null;
}
float height = child.getZ() - parent.getZ();
// Draw large shadow if difference in z index is more than 10dp
float largeShadowThreshold = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,
getMetrics(child));
boolean largeShadow = height > largeShadowThreshold;
int shadowSize = largeShadow ? ShadowPainter.SHADOW_SIZE : ShadowPainter.SMALL_SHADOW_SIZE;
shadow = new BufferedImage(clipBounds.width() + shadowSize, clipBounds.height(),
BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = shadow.createGraphics();
Rect rect = outline.mRect;
if (largeShadow) {
ShadowPainter.drawRectangleShadow(graphics,
rect.left + shadowSize, rect.top, rect.width(), rect.height());
} else {
ShadowPainter.drawSmallRectangleShadow(graphics,
rect.left + shadowSize, rect.top, rect.width(), rect.height());
}
graphics.dispose();
return new Shadow(shadow, shadowSize);
}
@NonNull
private static DisplayMetrics getMetrics(View view) {
Context context = view.getContext();
while (context instanceof ContextThemeWrapper) {
context = ((ContextThemeWrapper) context).getBaseContext();
}
if (context instanceof BridgeContext) {
return ((BridgeContext) context).getMetrics();
}
throw new RuntimeException("View " + view.getClass().getName() + " not created with the " +
"right context");
}
private static BufferedImage getPathShadow(View child, Outline outline, Canvas canvas) {
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) child.getZ()));
}
// 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;
}
private static class Shadow {
public BufferedImage mShadow;
public int mShadowWidth;
public Shadow(BufferedImage shadow, int shadowWidth) {
mShadow = shadow;
mShadowWidth = shadowWidth;
}
}
}
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