/*
* Copyright (C) 2006 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.graphics.drawable;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.*;
import android.view.Gravity;
import android.util.AttributeSet;
import java.io.IOException;
/**
* A Drawable that changes the size of another Drawable based on its current
* level value. You can control how much the child Drawable changes in width
* and height based on the level, as well as a gravity to control where it is
* placed in its overall container. Most often used to implement things like
* progress bars.
*
* <p>It can be defined in an XML file with the <code><scale></code> element.</p>
*
* @attr ref android.R.styleable#ScaleDrawable_scaleWidth
* @attr ref android.R.styleable#ScaleDrawable_scaleHeight
* @attr ref android.R.styleable#ScaleDrawable_scaleGravity
* @attr ref android.R.styleable#ScaleDrawable_drawable
*/
public class ScaleDrawable extends Drawable implements Drawable.Callback {
private ScaleState mScaleState;
private boolean mMutated;
private final Rect mTmpRect = new Rect();
ScaleDrawable() {
this(null);
}
public ScaleDrawable(Drawable drawable, int gravity, float scaleWidth, float scaleHeight) {
this(null);
mScaleState.mDrawable = drawable;
mScaleState.mGravity = gravity;
mScaleState.mScaleWidth = scaleWidth;
mScaleState.mScaleHeight = scaleHeight;
if (drawable != null) {
drawable.setCallback(this);
}
}
/**
* Returns the drawable scaled by this ScaleDrawable.
*/
public Drawable getDrawable() {
return mScaleState.mDrawable;
}
private static float getPercent(TypedArray a, int name) {
String s = a.getString(name);
if (s != null) {
if (s.endsWith("%")) {
String f = s.substring(0, s.length() - 1);
return Float.parseFloat(f) / 100.0f;
}
}
return -1;
}
@Override
public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
throws XmlPullParserException, IOException {
super.inflate(r, parser, attrs);
int type;
TypedArray a = r.obtainAttributes(attrs, com.android.internal.R.styleable.ScaleDrawable);
float sw = getPercent(a, com.android.internal.R.styleable.ScaleDrawable_scaleWidth);
float sh = getPercent(a, com.android.internal.R.styleable.ScaleDrawable_scaleHeight);
int g = a.getInt(com.android.internal.R.styleable.ScaleDrawable_scaleGravity, Gravity.LEFT);
Drawable dr = a.getDrawable(com.android.internal.R.styleable.ScaleDrawable_drawable);
a.recycle();
final int outerDepth = parser.getDepth();
while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
if (type != XmlPullParser.START_TAG) {
continue;
}
dr = Drawable.createFromXmlInner(r, parser, attrs);
}
if (dr == null) {
throw new IllegalArgumentException("No drawable specified for <scale>");
}
mScaleState.mDrawable = dr;
mScaleState.mScaleWidth = sw;
mScaleState.mScaleHeight = sh;
mScaleState.mGravity = g;
if (dr != null) {
dr.setCallback(this);
}
}
// overrides from Drawable.Callback
public void invalidateDrawable(Drawable who) {
if (mCallback != null) {
mCallback.invalidateDrawable(this);
}
}
public void scheduleDrawable(Drawable who, Runnable what, long when) {
if (mCallback != null) {
mCallback.scheduleDrawable(this, what, when);
}
}
public void unscheduleDrawable(Drawable who, Runnable what) {
if (mCallback != null) {
mCallback.unscheduleDrawable(this, what);
}
}
// overrides from Drawable
@Override
public void draw(Canvas canvas) {
if (mScaleState.mDrawable.getLevel() != 0)
mScaleState.mDrawable.draw(canvas);
}
@Override
public int getChangingConfigurations() {
return super.getChangingConfigurations()
| mScaleState.mChangingConfigurations
| mScaleState.mDrawable.getChangingConfigurations();
}
@Override
public boolean getPadding(Rect padding) {
// XXX need to adjust padding!
return mScaleState.mDrawable.getPadding(padding);
}
@Override
public boolean setVisible(boolean visible, boolean restart) {
mScaleState.mDrawable.setVisible(visible, restart);
return super.setVisible(visible, restart);
}
@Override
public void setAlpha(int alpha) {
mScaleState.mDrawable.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf) {
mScaleState.mDrawable.setColorFilter(cf);
}
@Override
public int getOpacity() {
return mScaleState.mDrawable.getOpacity();
}
@Override
public boolean isStateful() {
return mScaleState.mDrawable.isStateful();
}
@Override
protected boolean onStateChange(int[] state) {
boolean changed = mScaleState.mDrawable.setState(state);
onBoundsChange(getBounds());
return changed;
}
@Override
protected boolean onLevelChange(int level) {
mScaleState.mDrawable.setLevel(level);
onBoundsChange(getBounds());
invalidateSelf();
return true;
}
@Override
protected void onBoundsChange(Rect bounds) {
final Rect r = mTmpRect;
int level = getLevel();
int w = bounds.width();
final int iw = 0; //mScaleState.mDrawable.getIntrinsicWidth();
if (mScaleState.mScaleWidth > 0) {
w -= (int) ((w - iw) * (10000 - level) * mScaleState.mScaleWidth / 10000);
}
int h = bounds.height();
final int ih = 0; //mScaleState.mDrawable.getIntrinsicHeight();
if (mScaleState.mScaleHeight > 0) {
h -= (int) ((h - ih) * (10000 - level) * mScaleState.mScaleHeight / 10000);
}
Gravity.apply(mScaleState.mGravity, w, h, bounds, r);
if (w > 0 && h > 0) {
mScaleState.mDrawable.setBounds(r.left, r.top, r.right, r.bottom);
}
}
@Override
public int getIntrinsicWidth() {
return mScaleState.mDrawable.getIntrinsicWidth();
}
@Override
public int getIntrinsicHeight() {
return mScaleState.mDrawable.getIntrinsicHeight();
}
@Override
public ConstantState getConstantState() {
if (mScaleState.canConstantState()) {
mScaleState.mChangingConfigurations = super.getChangingConfigurations();
return mScaleState;
}
return null;
}
@Override
public Drawable mutate() {
if (!mMutated && super.mutate() == this) {
mScaleState.mDrawable.mutate();
mMutated = true;
}
return this;
}
final static class ScaleState extends ConstantState {
Drawable mDrawable;
int mChangingConfigurations;
float mScaleWidth;
float mScaleHeight;
int mGravity;
private boolean mCheckedConstantState;
private boolean mCanConstantState;
ScaleState(ScaleState orig, ScaleDrawable owner) {
if (orig != null) {
mDrawable = orig.mDrawable.getConstantState().newDrawable();
mDrawable.setCallback(owner);
mScaleWidth = orig.mScaleWidth;
mScaleHeight = orig.mScaleHeight;
mGravity = orig.mGravity;
mCheckedConstantState = mCanConstantState = true;
}
}
@Override
public Drawable newDrawable() {
return new ScaleDrawable(this);
}
@Override
public int getChangingConfigurations() {
return mChangingConfigurations;
}
boolean canConstantState() {
if (!mCheckedConstantState) {
mCanConstantState = mDrawable.getConstantState() != null;
mCheckedConstantState = true;
}
return mCanConstantState;
}
}
private ScaleDrawable(ScaleState state) {
mScaleState = new ScaleState(state, this);
}
}