graphics/java/android/graphics/drawable/ScaleDrawable.java - platform/frameworks/base - Git at Google

 /*
  * 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.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;

 /**
  * 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>&lt;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 mScaleState;
     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);

         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, Theme theme)
             throws XmlPullParserException, IOException {
         super.inflate(r, parser, attrs, theme);

         int type;

         TypedArray a = obtainAttributes(
                 r, theme, 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);
         boolean min = a.getBoolean(
                 com.android.internal.R.styleable.ScaleDrawable_useIntrinsicSizeAsMinimum, false);
         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, theme);
         }

         if (dr == null) {
             throw new IllegalArgumentException("No drawable specified for <scale>");
         }

         mScaleState.mDrawable = dr;
         mScaleState.mScaleWidth = sw;
         mScaleState.mScaleHeight = sh;
         mScaleState.mGravity = g;
         mScaleState.mUseIntrinsicSizeAsMin = min;
         if (dr != null) {
             dr.setCallback(this);
         }
     }

     // 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 (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 int getAlpha() {
         return mScaleState.mDrawable.getAlpha();
     }

     @Override
     public void setColorFilter(ColorFilter cf) {
         mScaleState.mDrawable.setColorFilter(cf);
     }

     @Override
     public void setTintList(ColorStateList tint) {
         mScaleState.mDrawable.setTintList(tint);
     }

     @Override
     public void setTintMode(Mode tintMode) {
         mScaleState.mDrawable.setTintMode(tintMode);
     }

     @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;
         final boolean min = mScaleState.mUseIntrinsicSizeAsMin;
         int level = getLevel();
         int w = bounds.width();
         if (mScaleState.mScaleWidth > 0) {
             final int iw = min ? mScaleState.mDrawable.getIntrinsicWidth() : 0;
             w -= (int) ((w - iw) * (10000 - level) * mScaleState.mScaleWidth / 10000);
         }
         int h = bounds.height();
         if (mScaleState.mScaleHeight > 0) {
             final int ih = min ? mScaleState.mDrawable.getIntrinsicHeight() : 0;
             h -= (int) ((h - ih) * (10000 - level) * mScaleState.mScaleHeight / 10000);
         }
         final int layoutDirection = getLayoutDirection();
         Gravity.apply(mScaleState.mGravity, w, h, bounds, r, layoutDirection);

         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 = 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;
         boolean mUseIntrinsicSizeAsMin;

         private boolean mCheckedConstantState;
         private boolean mCanConstantState;

         ScaleState(ScaleState orig, ScaleDrawable owner, Resources res) {
             if (orig != null) {
                 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 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;
         }
     }

     private ScaleDrawable(ScaleState state, Resources res) {
         mScaleState = new ScaleState(state, this, res);
     }
 }
	/*
	* 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.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;

	/**
	* 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 mScaleState;
	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);

	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, Theme theme)
	throws XmlPullParserException, IOException {
	super.inflate(r, parser, attrs, theme);

	int type;

	TypedArray a = obtainAttributes(
	r, theme, 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);
	boolean min = a.getBoolean(
	com.android.internal.R.styleable.ScaleDrawable_useIntrinsicSizeAsMinimum, false);
	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, theme);
	}

	if (dr == null) {
	throw new IllegalArgumentException("No drawable specified for <scale>");
	}

	mScaleState.mDrawable = dr;
	mScaleState.mScaleWidth = sw;
	mScaleState.mScaleHeight = sh;
	mScaleState.mGravity = g;
	mScaleState.mUseIntrinsicSizeAsMin = min;
	if (dr != null) {
	dr.setCallback(this);
	}
	}

	// 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 (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 int getAlpha() {
	return mScaleState.mDrawable.getAlpha();
	}

	@Override
	public void setColorFilter(ColorFilter cf) {
	mScaleState.mDrawable.setColorFilter(cf);
	}

	@Override
	public void setTintList(ColorStateList tint) {
	mScaleState.mDrawable.setTintList(tint);
	}

	@Override
	public void setTintMode(Mode tintMode) {
	mScaleState.mDrawable.setTintMode(tintMode);
	}

	@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;
	final boolean min = mScaleState.mUseIntrinsicSizeAsMin;
	int level = getLevel();
	int w = bounds.width();
	if (mScaleState.mScaleWidth > 0) {
	final int iw = min ? mScaleState.mDrawable.getIntrinsicWidth() : 0;
	w -= (int) ((w - iw) * (10000 - level) * mScaleState.mScaleWidth / 10000);
	}
	int h = bounds.height();
	if (mScaleState.mScaleHeight > 0) {
	final int ih = min ? mScaleState.mDrawable.getIntrinsicHeight() : 0;
	h -= (int) ((h - ih) * (10000 - level) * mScaleState.mScaleHeight / 10000);
	}
	final int layoutDirection = getLayoutDirection();
	Gravity.apply(mScaleState.mGravity, w, h, bounds, r, layoutDirection);

	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 = 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;
	boolean mUseIntrinsicSizeAsMin;

	private boolean mCheckedConstantState;
	private boolean mCanConstantState;

	ScaleState(ScaleState orig, ScaleDrawable owner, Resources res) {
	if (orig != null) {
	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 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;
	}
	}

	private ScaleDrawable(ScaleState state, Resources res) {
	mScaleState = new ScaleState(state, this, res);
	}
	}