/*
* 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 com.android.internal.R;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.Resources.Theme;
import android.graphics.*;
import android.graphics.PorterDuff.Mode;
import android.view.Gravity;
import android.util.AttributeSet;
import java.io.IOException;
import java.util.Collection;
/**
* 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. For more
* information, see the guide to <a
* href="{@docRoot}guide/topics/resources/drawable-resource.html">Drawable Resources</a>.</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 mState;
private boolean mMutated;
private final Rect mTmpRect = new Rect();
ScaleDrawable() {
this(null, null);
}
public ScaleDrawable(Drawable drawable, int gravity, float scaleWidth, float scaleHeight) {
this(null, null);
mState.mDrawable = drawable;
mState.mGravity = gravity;
mState.mScaleWidth = scaleWidth;
mState.mScaleHeight = scaleHeight;
if (drawable != null) {
drawable.setCallback(this);
}
}
/**
* Returns the drawable scaled by this ScaleDrawable.
*/
public Drawable getDrawable() {
return mState.mDrawable;
}
private static float getPercent(TypedArray a, int name, float defaultValue) {
final 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 defaultValue;
}
@Override
public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Theme theme)
throws XmlPullParserException, IOException {
super.inflate(r, parser, attrs, theme);
final TypedArray a = obtainAttributes(r, theme, attrs, R.styleable.ScaleDrawable);
// Reset mDrawable to preserve old multiple-inflate behavior. This is
// silly, but we have CTS tests that rely on it.
mState.mDrawable = null;
updateStateFromTypedArray(a);
inflateChildElements(r, parser, attrs, theme);
verifyRequiredAttributes(a);
a.recycle();
}
@Override
public void applyTheme(Theme t) {
super.applyTheme(t);
final ScaleState state = mState;
if (state == null) {
return;
}
if (state.mThemeAttrs != null) {
final TypedArray a = t.resolveAttributes(state.mThemeAttrs, R.styleable.ScaleDrawable);
try {
updateStateFromTypedArray(a);
verifyRequiredAttributes(a);
} catch (XmlPullParserException e) {
throw new RuntimeException(e);
} finally {
a.recycle();
}
}
if (state.mDrawable != null && state.mDrawable.canApplyTheme()) {
state.mDrawable.applyTheme(t);
}
}
private void inflateChildElements(Resources r, XmlPullParser parser, AttributeSet attrs,
Theme theme) throws XmlPullParserException, IOException {
Drawable dr = null;
int type;
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, theme);
}
if (dr != null) {
mState.mDrawable = dr;
dr.setCallback(this);
}
}
private void verifyRequiredAttributes(TypedArray a) throws XmlPullParserException {
// If we're not waiting on a theme, verify required attributes.
if (mState.mDrawable == null && (mState.mThemeAttrs == null
|| mState.mThemeAttrs[R.styleable.ScaleDrawable_drawable] == 0)) {
throw new XmlPullParserException(a.getPositionDescription()
+ ": <scale> tag requires a 'drawable' attribute or "
+ "child tag defining a drawable");
}
}
private void updateStateFromTypedArray(TypedArray a) {
final ScaleState state = mState;
// Account for any configuration changes.
state.mChangingConfigurations |= a.getChangingConfigurations();
// Extract the theme attributes, if any.
state.mThemeAttrs = a.extractThemeAttrs();
state.mScaleWidth = getPercent(
a, R.styleable.ScaleDrawable_scaleWidth, state.mScaleWidth);
state.mScaleHeight = getPercent(
a, R.styleable.ScaleDrawable_scaleHeight, state.mScaleHeight);
state.mGravity = a.getInt(R.styleable.ScaleDrawable_scaleGravity, state.mGravity);
state.mUseIntrinsicSizeAsMin = a.getBoolean(
R.styleable.ScaleDrawable_useIntrinsicSizeAsMinimum, state.mUseIntrinsicSizeAsMin);
final Drawable dr = a.getDrawable(R.styleable.ScaleDrawable_drawable);
if (dr != null) {
state.mDrawable = dr;
dr.setCallback(this);
}
}
@Override
public boolean canApplyTheme() {
return (mState != null && mState.canApplyTheme()) || super.canApplyTheme();
}
// overrides from Drawable.Callback
public void invalidateDrawable(Drawable who) {
if (getCallback() != null) {
getCallback().invalidateDrawable(this);
}
}
public void scheduleDrawable(Drawable who, Runnable what, long when) {
if (getCallback() != null) {
getCallback().scheduleDrawable(this, what, when);
}
}
public void unscheduleDrawable(Drawable who, Runnable what) {
if (getCallback() != null) {
getCallback().unscheduleDrawable(this, what);
}
}
// overrides from Drawable
@Override
public void draw(Canvas canvas) {
if (mState.mDrawable.getLevel() != 0)
mState.mDrawable.draw(canvas);
}
@Override
public int getChangingConfigurations() {
return super.getChangingConfigurations()
| mState.mChangingConfigurations
| mState.mDrawable.getChangingConfigurations();
}
@Override
public boolean getPadding(Rect padding) {
// XXX need to adjust padding!
return mState.mDrawable.getPadding(padding);
}
@Override
public boolean setVisible(boolean visible, boolean restart) {
mState.mDrawable.setVisible(visible, restart);
return super.setVisible(visible, restart);
}
@Override
public void setAlpha(int alpha) {
mState.mDrawable.setAlpha(alpha);
}
@Override
public int getAlpha() {
return mState.mDrawable.getAlpha();
}
@Override
public void setColorFilter(ColorFilter cf) {
mState.mDrawable.setColorFilter(cf);
}
@Override
public void setTintList(ColorStateList tint) {
mState.mDrawable.setTintList(tint);
}
@Override
public void setTintMode(Mode tintMode) {
mState.mDrawable.setTintMode(tintMode);
}
@Override
public int getOpacity() {
return mState.mDrawable.getOpacity();
}
@Override
public boolean isStateful() {
return mState.mDrawable.isStateful();
}
@Override
protected boolean onStateChange(int[] state) {
boolean changed = mState.mDrawable.setState(state);
onBoundsChange(getBounds());
return changed;
}
@Override
protected boolean onLevelChange(int level) {
mState.mDrawable.setLevel(level);
onBoundsChange(getBounds());
invalidateSelf();
return true;
}
@Override
protected void onBoundsChange(Rect bounds) {
final Rect r = mTmpRect;
final boolean min = mState.mUseIntrinsicSizeAsMin;
int level = getLevel();
int w = bounds.width();
if (mState.mScaleWidth > 0) {
final int iw = min ? mState.mDrawable.getIntrinsicWidth() : 0;
w -= (int) ((w - iw) * (10000 - level) * mState.mScaleWidth / 10000);
}
int h = bounds.height();
if (mState.mScaleHeight > 0) {
final int ih = min ? mState.mDrawable.getIntrinsicHeight() : 0;
h -= (int) ((h - ih) * (10000 - level) * mState.mScaleHeight / 10000);
}
final int layoutDirection = getLayoutDirection();
Gravity.apply(mState.mGravity, w, h, bounds, r, layoutDirection);
if (w > 0 && h > 0) {
mState.mDrawable.setBounds(r.left, r.top, r.right, r.bottom);
}
}
@Override
public int getIntrinsicWidth() {
return mState.mDrawable.getIntrinsicWidth();
}
@Override
public int getIntrinsicHeight() {
return mState.mDrawable.getIntrinsicHeight();
}
@Override
public ConstantState getConstantState() {
if (mState.canConstantState()) {
mState.mChangingConfigurations = getChangingConfigurations();
return mState;
}
return null;
}
@Override
public Drawable mutate() {
if (!mMutated && super.mutate() == this) {
mState.mDrawable.mutate();
mMutated = true;
}
return this;
}
/**
* @hide
*/
public void clearMutated() {
super.clearMutated();
mState.mDrawable.clearMutated();
mMutated = false;
}
final static class ScaleState extends ConstantState {
/** Constant used to disable scaling for a particular dimension. */
private static final float DO_NOT_SCALE = -1.0f;
int[] mThemeAttrs;
int mChangingConfigurations;
Drawable mDrawable;
float mScaleWidth = DO_NOT_SCALE;
float mScaleHeight = DO_NOT_SCALE;
int mGravity = Gravity.LEFT;
boolean mUseIntrinsicSizeAsMin = false;
private boolean mCheckedConstantState;
private boolean mCanConstantState;
ScaleState(ScaleState orig, ScaleDrawable owner, Resources res) {
if (orig != null) {
mThemeAttrs = orig.mThemeAttrs;
mChangingConfigurations = orig.mChangingConfigurations;
if (res != null) {
mDrawable = orig.mDrawable.getConstantState().newDrawable(res);
} else {
mDrawable = orig.mDrawable.getConstantState().newDrawable();
}
mDrawable.setCallback(owner);
mDrawable.setLayoutDirection(orig.mDrawable.getLayoutDirection());
mDrawable.setBounds(orig.mDrawable.getBounds());
mDrawable.setLevel(orig.mDrawable.getLevel());
mScaleWidth = orig.mScaleWidth;
mScaleHeight = orig.mScaleHeight;
mGravity = orig.mGravity;
mUseIntrinsicSizeAsMin = orig.mUseIntrinsicSizeAsMin;
mCheckedConstantState = mCanConstantState = true;
}
}
@Override
public boolean canApplyTheme() {
return mThemeAttrs != null || (mDrawable != null && mDrawable.canApplyTheme())
|| super.canApplyTheme();
}
@Override
public Drawable newDrawable() {
return new ScaleDrawable(this, null);
}
@Override
public Drawable newDrawable(Resources res) {
return new ScaleDrawable(this, res);
}
@Override
public int getChangingConfigurations() {
return mChangingConfigurations;
}
boolean canConstantState() {
if (!mCheckedConstantState) {
mCanConstantState = mDrawable.getConstantState() != null;
mCheckedConstantState = true;
}
return mCanConstantState;
}
@Override
public int addAtlasableBitmaps(Collection<Bitmap> atlasList) {
final ConstantState state = mDrawable.getConstantState();
if (state != null) {
return state.addAtlasableBitmaps(atlasList);
}
return 0;
}
}
private ScaleDrawable(ScaleState state, Resources res) {
mState = new ScaleState(state, this, res);
}
}
|
