/*
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* Copyright (C) 2008 The Android Open Source Project, Romain Guy
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.lcjian.library.drawable;
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import android.graphics.*;
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import android.graphics.drawable.Drawable;
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class LayerDrawable extends Drawable implements Drawable.Callback {
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LayerState mLayerState;
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private int[] mPaddingL;
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private int[] mPaddingT;
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private int[] mPaddingR;
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private int[] mPaddingB;
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private final Rect mTmpRect = new Rect();
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private Drawable mParent;
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private boolean mBlockSetBounds;
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LayerDrawable(Drawable... layers) {
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this(null, layers);
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}
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LayerDrawable(LayerState state, Drawable... layers) {
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this(state);
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int length = layers.length;
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Rec[] r = new Rec[length];
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final LayerState layerState = mLayerState;
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for (int i = 0; i < length; i++) {
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r[i] = new Rec();
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r[i].mDrawable = layers[i];
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layers[i].setCallback(this);
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layerState.mChildrenChangingConfigurations |= layers[i].getChangingConfigurations();
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}
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layerState.mNum = length;
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layerState.mArray = r;
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ensurePadding();
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}
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LayerDrawable(LayerState state) {
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LayerState as = createConstantState(state);
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mLayerState = as;
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if (as.mNum > 0) {
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ensurePadding();
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}
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}
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LayerState createConstantState(LayerState state) {
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return new LayerState(state, this);
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}
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public void invalidateDrawable(Drawable who) {
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invalidateSelf();
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}
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public void scheduleDrawable(Drawable who, Runnable what, long when) {
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scheduleSelf(what, when);
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}
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public void unscheduleDrawable(Drawable who, Runnable what) {
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unscheduleSelf(what);
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}
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@Override
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public void draw(Canvas canvas) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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for (int i = 0; i < N; i++) {
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array[i].mDrawable.draw(canvas);
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}
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}
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@Override
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public int getChangingConfigurations() {
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return super.getChangingConfigurations()
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| mLayerState.mChangingConfigurations
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| mLayerState.mChildrenChangingConfigurations;
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}
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@Override
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public boolean getPadding(Rect padding) {
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padding.left = 0;
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padding.top = 0;
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padding.right = 0;
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padding.bottom = 0;
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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for (int i = 0; i < N; i++) {
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reapplyPadding(i, array[i]);
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padding.left = Math.max(padding.left, mPaddingL[i]);
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padding.top = Math.max(padding.top, mPaddingT[i]);
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padding.right = Math.max(padding.right, mPaddingR[i]);
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padding.bottom = Math.max(padding.bottom, mPaddingB[i]);
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}
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return true;
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}
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@Override
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public boolean setVisible(boolean visible, boolean restart) {
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boolean changed = super.setVisible(visible, restart);
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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for (int i = 0; i < N; i++) {
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array[i].mDrawable.setVisible(visible, restart);
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}
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return changed;
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}
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@Override
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public void setDither(boolean dither) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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for (int i = 0; i < N; i++) {
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array[i].mDrawable.setDither(dither);
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}
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}
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@Override
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public void setAlpha(int alpha) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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for (int i = 0; i < N; i++) {
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array[i].mDrawable.setAlpha(alpha);
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}
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}
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@Override
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public void setColorFilter(ColorFilter cf) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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for (int i = 0; i < N; i++) {
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array[i].mDrawable.setColorFilter(cf);
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}
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}
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@Override
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public int getOpacity() {
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return mLayerState.getOpacity();
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}
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@Override
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public boolean isStateful() {
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return mLayerState.isStateful();
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}
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@Override
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protected boolean onStateChange(int[] state) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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boolean paddingChanged = false;
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boolean changed = false;
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for (int i = 0; i < N; i++) {
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final Rec r = array[i];
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if (r.mDrawable.setState(state)) {
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changed = true;
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}
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if (reapplyPadding(i, r)) {
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paddingChanged = true;
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}
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}
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if (paddingChanged) {
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onBoundsChange(getBounds());
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}
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return changed;
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}
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@Override
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protected boolean onLevelChange(int level) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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boolean paddingChanged = false;
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boolean changed = false;
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for (int i = 0; i < N; i++) {
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final Rec r = array[i];
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if (r.mDrawable.setLevel(level)) {
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changed = true;
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}
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if (reapplyPadding(i, r)) {
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paddingChanged = true;
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}
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}
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if (paddingChanged) {
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onBoundsChange(getBounds());
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}
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return changed;
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}
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@Override
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public void setBounds(int left, int top, int right, int bottom) {
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if (mBlockSetBounds) return;
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final int width = mLayerState.mArray[0].mDrawable.getIntrinsicWidth();
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left -= (width - (right - left)) / 2.0f;
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right = left + width;
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bottom = top + getIntrinsicHeight();
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super.setBounds(left, top, right, bottom);
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if (mParent != null) {
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mBlockSetBounds = true;
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mParent.setBounds(left, top, right, bottom);
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mBlockSetBounds = false;
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}
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}
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public void setParent(Drawable drawable) {
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mParent = drawable;
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}
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@Override
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protected void onBoundsChange(Rect bounds) {
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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int padL = 0, padT = 0, padR = 0, padB = 0;
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for (int i = 0; i < N; i++) {
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final Rec r = array[i];
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r.mDrawable.setBounds(bounds.left + r.mInsetL + padL,
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bounds.top + r.mInsetT + padT,
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bounds.right - r.mInsetR - padR,
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bounds.bottom - r.mInsetB - padB);
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padL += mPaddingL[i];
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padR += mPaddingR[i];
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padT += mPaddingT[i];
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padB += mPaddingB[i];
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}
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}
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@Override
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public int getIntrinsicWidth() {
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int width = -1;
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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int padL = 0, padR = 0;
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for (int i = 0; i < N; i++) {
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final Rec r = array[i];
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int w = r.mDrawable.getIntrinsicWidth()
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+ r.mInsetL + r.mInsetR + padL + padR;
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if (w > width) {
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width = w;
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}
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padL += mPaddingL[i];
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padR += mPaddingR[i];
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}
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return width;
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}
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@Override
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public int getIntrinsicHeight() {
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int height = -1;
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final Rec[] array = mLayerState.mArray;
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final int N = mLayerState.mNum;
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int padT = 0, padB = 0;
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for (int i = 0; i < N; i++) {
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final Rec r = array[i];
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int h = r.mDrawable.getIntrinsicHeight() + r.mInsetT + r.mInsetB + +padT + padB;
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if (h > height) {
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height = h;
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}
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padT += mPaddingT[i];
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padB += mPaddingB[i];
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}
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return height;
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}
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private boolean reapplyPadding(int i, Rec r) {
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final Rect rect = mTmpRect;
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r.mDrawable.getPadding(rect);
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if (rect.left != mPaddingL[i] || rect.top != mPaddingT[i] ||
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rect.right != mPaddingR[i] || rect.bottom != mPaddingB[i]) {
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mPaddingL[i] = rect.left;
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mPaddingT[i] = rect.top;
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mPaddingR[i] = rect.right;
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mPaddingB[i] = rect.bottom;
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return true;
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}
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return false;
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}
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private void ensurePadding() {
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final int N = mLayerState.mNum;
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if (mPaddingL != null && mPaddingL.length >= N) {
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return;
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}
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mPaddingL = new int[N];
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mPaddingT = new int[N];
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mPaddingR = new int[N];
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mPaddingB = new int[N];
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}
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@Override
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public ConstantState getConstantState() {
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if (mLayerState.canConstantState()) {
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mLayerState.mChangingConfigurations = super.getChangingConfigurations();
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return mLayerState;
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}
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return null;
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}
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static class Rec {
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public Drawable mDrawable;
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public int mInsetL, mInsetT, mInsetR, mInsetB;
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public int mId;
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}
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static class LayerState extends ConstantState {
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int mNum;
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Rec[] mArray;
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int mChangingConfigurations;
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int mChildrenChangingConfigurations;
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private boolean mHaveOpacity = false;
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private int mOpacity;
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private boolean mHaveStateful = false;
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private boolean mStateful;
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private boolean mCheckedConstantState;
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private boolean mCanConstantState;
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LayerState(LayerState orig, LayerDrawable owner) {
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if (orig != null) {
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final Rec[] origRec = orig.mArray;
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final int N = orig.mNum;
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mNum = N;
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mArray = new Rec[N];
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mChangingConfigurations = orig.mChangingConfigurations;
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mChildrenChangingConfigurations = orig.mChildrenChangingConfigurations;
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for (int i = 0; i < N; i++) {
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final Rec r = mArray[i] = new Rec();
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final Rec or = origRec[i];
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r.mDrawable = or.mDrawable.getConstantState().newDrawable();
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r.mDrawable.setCallback(owner);
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r.mInsetL = or.mInsetL;
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r.mInsetT = or.mInsetT;
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r.mInsetR = or.mInsetR;
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r.mInsetB = or.mInsetB;
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r.mId = or.mId;
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}
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mHaveOpacity = orig.mHaveOpacity;
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mOpacity = orig.mOpacity;
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mHaveStateful = orig.mHaveStateful;
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mStateful = orig.mStateful;
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mCheckedConstantState = mCanConstantState = true;
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} else {
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mNum = 0;
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mArray = null;
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}
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}
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@Override
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public Drawable newDrawable() {
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return new LayerDrawable(this);
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}
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@Override
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public int getChangingConfigurations() {
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return mChangingConfigurations;
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}
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public final int getOpacity() {
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if (mHaveOpacity) {
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return mOpacity;
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}
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final int N = mNum;
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final Rec[] array = mArray;
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int op = N > 0 ? array[0].mDrawable.getOpacity() : PixelFormat.TRANSPARENT;
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for (int i = 1; i < N; i++) {
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op = Drawable.resolveOpacity(op, array[i].mDrawable.getOpacity());
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}
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mOpacity = op;
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mHaveOpacity = true;
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return op;
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}
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public final boolean isStateful() {
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if (mHaveStateful) {
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return mStateful;
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}
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boolean stateful = false;
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final int N = mNum;
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final Rec[] array = mArray;
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for (int i = 0; i < N; i++) {
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if (array[i].mDrawable.isStateful()) {
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stateful = true;
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break;
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}
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}
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mStateful = stateful;
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mHaveStateful = true;
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return stateful;
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}
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public synchronized boolean canConstantState() {
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final Rec[] array = mArray;
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if (!mCheckedConstantState && array != null) {
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mCanConstantState = true;
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final int N = mNum;
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for (int i = 0; i < N; i++) {
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if (array[i].mDrawable.getConstantState() == null) {
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mCanConstantState = false;
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break;
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}
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}
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mCheckedConstantState = true;
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}
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return mCanConstantState;
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}
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}
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}
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