/*
* Copyright (C) 2009 Muthu Ramadoss. All rights reserved.
*
* Modified from Romain Guy Shelves project to suit Books-Exchange requirements.
* Original source from Shelves - http://code.google.com/p/shelves/
*/
/*
* Copyright (C) 2008 The Android Open Source Project, Romain Guy
*
* 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.androidrocks.bex.drawable;
import android.graphics.*;
import android.graphics.drawable.Drawable;
class LayerDrawable extends Drawable implements Drawable.Callback {
LayerState mLayerState;
private int[] mPaddingL;
private int[] mPaddingT;
private int[] mPaddingR;
private int[] mPaddingB;
private final Rect mTmpRect = new Rect();
private Drawable mParent;
private boolean mBlockSetBounds;
LayerDrawable(Drawable... layers) {
this(null, layers);
}
LayerDrawable(LayerState state, Drawable... layers) {
this(state);
int length = layers.length;
Rec[] r = new Rec[length];
final LayerState layerState = mLayerState;
for (int i = 0; i < length; i++) {
r[i] = new Rec();
r[i].mDrawable = layers[i];
layers[i].setCallback(this);
layerState.mChildrenChangingConfigurations |= layers[i].getChangingConfigurations();
}
layerState.mNum = length;
layerState.mArray = r;
ensurePadding();
}
LayerDrawable(LayerState state) {
LayerState as = createConstantState(state);
mLayerState = as;
if (as.mNum > 0) {
ensurePadding();
}
}
LayerState createConstantState(LayerState state) {
return new LayerState(state, this);
}
public void invalidateDrawable(Drawable who) {
invalidateSelf();
}
public void scheduleDrawable(Drawable who, Runnable what, long when) {
scheduleSelf(what, when);
}
public void unscheduleDrawable(Drawable who, Runnable what) {
unscheduleSelf(what);
}
@Override
public void draw(Canvas canvas) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
for (int i = 0; i < N; i++) {
array[i].mDrawable.draw(canvas);
}
}
@Override
public int getChangingConfigurations() {
return super.getChangingConfigurations()
| mLayerState.mChangingConfigurations
| mLayerState.mChildrenChangingConfigurations;
}
@Override
public boolean getPadding(Rect padding) {
padding.left = 0;
padding.top = 0;
padding.right = 0;
padding.bottom = 0;
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
for (int i = 0; i < N; i++) {
reapplyPadding(i, array[i]);
padding.left = Math.max(padding.left, mPaddingL[i]);
padding.top = Math.max(padding.top, mPaddingT[i]);
padding.right = Math.max(padding.right, mPaddingR[i]);
padding.bottom = Math.max(padding.bottom, mPaddingB[i]);
}
return true;
}
@Override
public boolean setVisible(boolean visible, boolean restart) {
boolean changed = super.setVisible(visible, restart);
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
for (int i = 0; i < N; i++) {
array[i].mDrawable.setVisible(visible, restart);
}
return changed;
}
@Override
public void setDither(boolean dither) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
for (int i = 0; i < N; i++) {
array[i].mDrawable.setDither(dither);
}
}
@Override
public void setAlpha(int alpha) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
for (int i = 0; i < N; i++) {
array[i].mDrawable.setAlpha(alpha);
}
}
@Override
public void setColorFilter(ColorFilter cf) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
for (int i = 0; i < N; i++) {
array[i].mDrawable.setColorFilter(cf);
}
}
@Override
public int getOpacity() {
return mLayerState.getOpacity();
}
@Override
public boolean isStateful() {
return mLayerState.isStateful();
}
@Override
protected boolean onStateChange(int[] state) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
boolean paddingChanged = false;
boolean changed = false;
for (int i = 0; i < N; i++) {
final Rec r = array[i];
if (r.mDrawable.setState(state)) {
changed = true;
}
if (reapplyPadding(i, r)) {
paddingChanged = true;
}
}
if (paddingChanged) {
onBoundsChange(getBounds());
}
return changed;
}
@Override
protected boolean onLevelChange(int level) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
boolean paddingChanged = false;
boolean changed = false;
for (int i = 0; i < N; i++) {
final Rec r = array[i];
if (r.mDrawable.setLevel(level)) {
changed = true;
}
if (reapplyPadding(i, r)) {
paddingChanged = true;
}
}
if (paddingChanged) {
onBoundsChange(getBounds());
}
return changed;
}
@Override
public void setBounds(int left, int top, int right, int bottom) {
if (mBlockSetBounds) return;
final int width = mLayerState.mArray[0].mDrawable.getIntrinsicWidth();
left -= (width - (right - left)) / 2.0f;
right = left + width;
bottom = top + getIntrinsicHeight();
super.setBounds(left, top, right, bottom);
if (mParent != null) {
mBlockSetBounds = true;
mParent.setBounds(left, top, right, bottom);
mBlockSetBounds = false;
}
}
public void setParent(Drawable drawable) {
mParent = drawable;
}
@Override
protected void onBoundsChange(Rect bounds) {
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
int padL = 0, padT = 0, padR = 0, padB = 0;
for (int i = 0; i < N; i++) {
final Rec r = array[i];
r.mDrawable.setBounds(bounds.left + r.mInsetL + padL,
bounds.top + r.mInsetT + padT,
bounds.right - r.mInsetR - padR,
bounds.bottom - r.mInsetB - padB);
padL += mPaddingL[i];
padR += mPaddingR[i];
padT += mPaddingT[i];
padB += mPaddingB[i];
}
}
@Override
public int getIntrinsicWidth() {
int width = -1;
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
int padL = 0, padR = 0;
for (int i = 0; i < N; i++) {
final Rec r = array[i];
int w = r.mDrawable.getIntrinsicWidth()
+ r.mInsetL + r.mInsetR + padL + padR;
if (w > width) {
width = w;
}
padL += mPaddingL[i];
padR += mPaddingR[i];
}
return width;
}
@Override
public int getIntrinsicHeight() {
int height = -1;
final Rec[] array = mLayerState.mArray;
final int N = mLayerState.mNum;
int padT = 0, padB = 0;
for (int i = 0; i < N; i++) {
final Rec r = array[i];
int h = r.mDrawable.getIntrinsicHeight() + r.mInsetT + r.mInsetB + +padT + padB;
if (h > height) {
height = h;
}
padT += mPaddingT[i];
padB += mPaddingB[i];
}
return height;
}
private boolean reapplyPadding(int i, Rec r) {
final Rect rect = mTmpRect;
r.mDrawable.getPadding(rect);
if (rect.left != mPaddingL[i] || rect.top != mPaddingT[i] ||
rect.right != mPaddingR[i] || rect.bottom != mPaddingB[i]) {
mPaddingL[i] = rect.left;
mPaddingT[i] = rect.top;
mPaddingR[i] = rect.right;
mPaddingB[i] = rect.bottom;
return true;
}
return false;
}
private void ensurePadding() {
final int N = mLayerState.mNum;
if (mPaddingL != null && mPaddingL.length >= N) {
return;
}
mPaddingL = new int[N];
mPaddingT = new int[N];
mPaddingR = new int[N];
mPaddingB = new int[N];
}
@Override
public ConstantState getConstantState() {
if (mLayerState.canConstantState()) {
mLayerState.mChangingConfigurations = super.getChangingConfigurations();
return mLayerState;
}
return null;
}
static class Rec {
public Drawable mDrawable;
public int mInsetL, mInsetT, mInsetR, mInsetB;
public int mId;
}
static class LayerState extends ConstantState {
int mNum;
Rec[] mArray;
int mChangingConfigurations;
int mChildrenChangingConfigurations;
private boolean mHaveOpacity = false;
private int mOpacity;
private boolean mHaveStateful = false;
private boolean mStateful;
private boolean mCheckedConstantState;
private boolean mCanConstantState;
LayerState(LayerState orig, LayerDrawable owner) {
if (orig != null) {
final Rec[] origRec = orig.mArray;
final int N = orig.mNum;
mNum = N;
mArray = new Rec[N];
mChangingConfigurations = orig.mChangingConfigurations;
mChildrenChangingConfigurations = orig.mChildrenChangingConfigurations;
for (int i = 0; i < N; i++) {
final Rec r = mArray[i] = new Rec();
final Rec or = origRec[i];
r.mDrawable = or.mDrawable.getConstantState().newDrawable();
r.mDrawable.setCallback(owner);
r.mInsetL = or.mInsetL;
r.mInsetT = or.mInsetT;
r.mInsetR = or.mInsetR;
r.mInsetB = or.mInsetB;
r.mId = or.mId;
}
mHaveOpacity = orig.mHaveOpacity;
mOpacity = orig.mOpacity;
mHaveStateful = orig.mHaveStateful;
mStateful = orig.mStateful;
mCheckedConstantState = mCanConstantState = true;
} else {
mNum = 0;
mArray = null;
}
}
@Override
public Drawable newDrawable() {
return new LayerDrawable(this);
}
@Override
public int getChangingConfigurations() {
return mChangingConfigurations;
}
public final int getOpacity() {
if (mHaveOpacity) {
return mOpacity;
}
final int N = mNum;
final Rec[] array = mArray;
int op = N > 0 ? array[0].mDrawable.getOpacity() : PixelFormat.TRANSPARENT;
for (int i = 1; i < N; i++) {
op = Drawable.resolveOpacity(op, array[i].mDrawable.getOpacity());
}
mOpacity = op;
mHaveOpacity = true;
return op;
}
public final boolean isStateful() {
if (mHaveStateful) {
return mStateful;
}
boolean stateful = false;
final int N = mNum;
final Rec[] array = mArray;
for (int i = 0; i < N; i++) {
if (array[i].mDrawable.isStateful()) {
stateful = true;
break;
}
}
mStateful = stateful;
mHaveStateful = true;
return stateful;
}
public synchronized boolean canConstantState() {
final Rec[] array = mArray;
if (!mCheckedConstantState && array != null) {
mCanConstantState = true;
final int N = mNum;
for (int i = 0; i < N; i++) {
if (array[i].mDrawable.getConstantState() == null) {
mCanConstantState = false;
break;
}
}
mCheckedConstantState = true;
}
return mCanConstantState;
}
}
}