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

 /*
  * Copyright (C) 2008 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.util.AttributeSet;
 import android.util.Log;

 import java.io.IOException;

 /**
  * A Drawable that insets another Drawable by a specified distance.
  * This is used when a View needs a background that is smaller than
  * the View's actual bounds.
  *
  * <p>It can be defined in an XML file with the <code>&lt;inset></code> element.</p>
  *
  * @attr ref android.R.styleable#InsetDrawable_visible
  * @attr ref android.R.styleable#InsetDrawable_drawable
  * @attr ref android.R.styleable#InsetDrawable_insetLeft
  * @attr ref android.R.styleable#InsetDrawable_insetRight
  * @attr ref android.R.styleable#InsetDrawable_insetTop
  * @attr ref android.R.styleable#InsetDrawable_insetBottom
  */
 public class InsetDrawable extends Drawable implements Drawable.Callback
 {
     // Most of this is copied from ScaleDrawable.
     private InsetState mInsetState;
     private final Rect mTmpRect = new Rect();
     private boolean mMutated;

     /*package*/ InsetDrawable() {
         this(null);
     }

     public InsetDrawable(Drawable drawable, int inset) {
         this(drawable, inset, inset, inset, inset);
     }

     public InsetDrawable(Drawable drawable, int insetLeft, int insetTop,
                          int insetRight, int insetBottom) {
         this(null);

         mInsetState.mDrawable = drawable;
         mInsetState.mInsetLeft = insetLeft;
         mInsetState.mInsetTop = insetTop;
         mInsetState.mInsetRight = insetRight;
         mInsetState.mInsetBottom = insetBottom;

         if (drawable != null) {
             drawable.setCallback(this);
         }
     }

     @Override public void inflate(Resources r, XmlPullParser parser,
                                   AttributeSet attrs)
     throws XmlPullParserException, IOException {
         int type;

         TypedArray a = r.obtainAttributes(attrs,
                 com.android.internal.R.styleable.InsetDrawable);

         super.inflateWithAttributes(r, parser, a,
                 com.android.internal.R.styleable.InsetDrawable_visible);

         int drawableRes = a.getResourceId(com.android.internal.R.styleable.
                                     InsetDrawable_drawable, 0);

         int inLeft = a.getDimensionPixelOffset(com.android.internal.R.styleable.
                                     InsetDrawable_insetLeft, 0);
         int inTop = a.getDimensionPixelOffset(com.android.internal.R.styleable.
                                     InsetDrawable_insetTop, 0);
         int inRight = a.getDimensionPixelOffset(com.android.internal.R.styleable.
                                     InsetDrawable_insetRight, 0);
         int inBottom = a.getDimensionPixelOffset(com.android.internal.R.styleable.
                                     InsetDrawable_insetBottom, 0);

         a.recycle();

         Drawable dr;
         if (drawableRes != 0) {
             dr = r.getDrawable(drawableRes);
         } else {
             while ((type=parser.next()) == XmlPullParser.TEXT) {
             }
             if (type != XmlPullParser.START_TAG) {
                 throw new XmlPullParserException(
                         parser.getPositionDescription()
                         + ": <inset> tag requires a 'drawable' attribute or "
                         + "child tag defining a drawable");
             }
             dr = Drawable.createFromXmlInner(r, parser, attrs);
         }

         if (dr == null) {
             Log.w("drawable", "No drawable specified for <inset>");
         }

         mInsetState.mDrawable = dr;
         mInsetState.mInsetLeft = inLeft;
         mInsetState.mInsetRight = inRight;
         mInsetState.mInsetTop = inTop;
         mInsetState.mInsetBottom = inBottom;

         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) {
         mInsetState.mDrawable.draw(canvas);
     }

     @Override
     public int getChangingConfigurations() {
         return super.getChangingConfigurations()
                 | mInsetState.mChangingConfigurations
                 | mInsetState.mDrawable.getChangingConfigurations();
     }

     @Override
     public boolean getPadding(Rect padding) {
         boolean pad = mInsetState.mDrawable.getPadding(padding);

         padding.left += mInsetState.mInsetLeft;
         padding.right += mInsetState.mInsetRight;
         padding.top += mInsetState.mInsetTop;
         padding.bottom += mInsetState.mInsetBottom;

         if (pad || (mInsetState.mInsetLeft | mInsetState.mInsetRight |
                     mInsetState.mInsetTop | mInsetState.mInsetBottom) != 0) {
             return true;
         } else {
             return false;
         }
     }

     @Override
     public boolean setVisible(boolean visible, boolean restart) {
         mInsetState.mDrawable.setVisible(visible, restart);
         return super.setVisible(visible, restart);
     }

     @Override
     public void setAlpha(int alpha) {
         mInsetState.mDrawable.setAlpha(alpha);
     }

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

     @Override
     public int getOpacity() {
         return mInsetState.mDrawable.getOpacity();
     }

     @Override
     public boolean isStateful() {
         return mInsetState.mDrawable.isStateful();
     }

     @Override
     protected boolean onStateChange(int[] state) {
         boolean changed = mInsetState.mDrawable.setState(state);
         onBoundsChange(getBounds());
         return changed;
     }

     @Override
     protected void onBoundsChange(Rect bounds) {
         final Rect r = mTmpRect;
         r.set(bounds);

         r.left += mInsetState.mInsetLeft;
         r.top += mInsetState.mInsetTop;
         r.right -= mInsetState.mInsetRight;
         r.bottom -= mInsetState.mInsetBottom;

         mInsetState.mDrawable.setBounds(r.left, r.top, r.right, r.bottom);
     }

     @Override
     public int getIntrinsicWidth() {
         return mInsetState.mDrawable.getIntrinsicWidth();
     }

     @Override
     public int getIntrinsicHeight() {
         return mInsetState.mDrawable.getIntrinsicHeight();
     }

     @Override
     public ConstantState getConstantState() {
         if (mInsetState.canConstantState()) {
             mInsetState.mChangingConfigurations = super.getChangingConfigurations();
             return mInsetState;
         }
         return null;
     }

     @Override
     public Drawable mutate() {
         if (!mMutated && super.mutate() == this) {
             mInsetState.mDrawable.mutate();
             mMutated = true;
         }
         return this;
     }

     final static class InsetState extends ConstantState {
         Drawable mDrawable;
         int mChangingConfigurations;

         int mInsetLeft;
         int mInsetTop;
         int mInsetRight;
         int mInsetBottom;

         boolean mCheckedConstantState;
         boolean mCanConstantState;

         InsetState(InsetState orig, InsetDrawable owner) {
             if (orig != null) {
                 mDrawable = orig.mDrawable.getConstantState().newDrawable();
                 mDrawable.setCallback(owner);
                 mInsetLeft = orig.mInsetLeft;
                 mInsetTop = orig.mInsetTop;
                 mInsetRight = orig.mInsetRight;
                 mInsetBottom = orig.mInsetBottom;
                 mCheckedConstantState = mCanConstantState = true;
             }
         }

         @Override
         public Drawable newDrawable() {
             return new InsetDrawable(this);
         }

         @Override
         public int getChangingConfigurations() {
             return mChangingConfigurations;
         }

         boolean canConstantState() {
             if (!mCheckedConstantState) {
                 mCanConstantState = mDrawable.getConstantState() != null;
                 mCheckedConstantState = true;
             }

             return mCanConstantState;
         }
     }

     private InsetDrawable(InsetState state) {
         mInsetState = new InsetState(state, this);
     }
 }
	/*
	* Copyright (C) 2008 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.util.AttributeSet;
	import android.util.Log;

	import java.io.IOException;

	/**
	* A Drawable that insets another Drawable by a specified distance.
	* This is used when a View needs a background that is smaller than
	* the View's actual bounds.
	*
	* <p>It can be defined in an XML file with the <code><inset></code> element.</p>
	*
	* @attr ref android.R.styleable#InsetDrawable_visible
	* @attr ref android.R.styleable#InsetDrawable_drawable
	* @attr ref android.R.styleable#InsetDrawable_insetLeft
	* @attr ref android.R.styleable#InsetDrawable_insetRight
	* @attr ref android.R.styleable#InsetDrawable_insetTop
	* @attr ref android.R.styleable#InsetDrawable_insetBottom
	*/
	public class InsetDrawable extends Drawable implements Drawable.Callback
	{
	// Most of this is copied from ScaleDrawable.
	private InsetState mInsetState;
	private final Rect mTmpRect = new Rect();
	private boolean mMutated;

	/package/ InsetDrawable() {
	this(null);
	}

	public InsetDrawable(Drawable drawable, int inset) {
	this(drawable, inset, inset, inset, inset);
	}

	public InsetDrawable(Drawable drawable, int insetLeft, int insetTop,
	int insetRight, int insetBottom) {
	this(null);

	mInsetState.mDrawable = drawable;
	mInsetState.mInsetLeft = insetLeft;
	mInsetState.mInsetTop = insetTop;
	mInsetState.mInsetRight = insetRight;
	mInsetState.mInsetBottom = insetBottom;

	if (drawable != null) {
	drawable.setCallback(this);
	}
	}

	@Override public void inflate(Resources r, XmlPullParser parser,
	AttributeSet attrs)
	throws XmlPullParserException, IOException {
	int type;

	TypedArray a = r.obtainAttributes(attrs,
	com.android.internal.R.styleable.InsetDrawable);

	super.inflateWithAttributes(r, parser, a,
	com.android.internal.R.styleable.InsetDrawable_visible);

	int drawableRes = a.getResourceId(com.android.internal.R.styleable.
	InsetDrawable_drawable, 0);

	int inLeft = a.getDimensionPixelOffset(com.android.internal.R.styleable.
	InsetDrawable_insetLeft, 0);
	int inTop = a.getDimensionPixelOffset(com.android.internal.R.styleable.
	InsetDrawable_insetTop, 0);
	int inRight = a.getDimensionPixelOffset(com.android.internal.R.styleable.
	InsetDrawable_insetRight, 0);
	int inBottom = a.getDimensionPixelOffset(com.android.internal.R.styleable.
	InsetDrawable_insetBottom, 0);

	a.recycle();

	Drawable dr;
	if (drawableRes != 0) {
	dr = r.getDrawable(drawableRes);
	} else {
	while ((type=parser.next()) == XmlPullParser.TEXT) {
	}
	if (type != XmlPullParser.START_TAG) {
	throw new XmlPullParserException(
	parser.getPositionDescription()
	+ ": <inset> tag requires a 'drawable' attribute or "
	+ "child tag defining a drawable");
	}
	dr = Drawable.createFromXmlInner(r, parser, attrs);
	}

	if (dr == null) {
	Log.w("drawable", "No drawable specified for <inset>");
	}

	mInsetState.mDrawable = dr;
	mInsetState.mInsetLeft = inLeft;
	mInsetState.mInsetRight = inRight;
	mInsetState.mInsetTop = inTop;
	mInsetState.mInsetBottom = inBottom;

	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) {
	mInsetState.mDrawable.draw(canvas);
	}

	@Override
	public int getChangingConfigurations() {
	return super.getChangingConfigurations()
	\| mInsetState.mChangingConfigurations
	\| mInsetState.mDrawable.getChangingConfigurations();
	}

	@Override
	public boolean getPadding(Rect padding) {
	boolean pad = mInsetState.mDrawable.getPadding(padding);

	padding.left += mInsetState.mInsetLeft;
	padding.right += mInsetState.mInsetRight;
	padding.top += mInsetState.mInsetTop;
	padding.bottom += mInsetState.mInsetBottom;

	if (pad \|\| (mInsetState.mInsetLeft \| mInsetState.mInsetRight \|
	mInsetState.mInsetTop \| mInsetState.mInsetBottom) != 0) {
	return true;
	} else {
	return false;
	}
	}

	@Override
	public boolean setVisible(boolean visible, boolean restart) {
	mInsetState.mDrawable.setVisible(visible, restart);
	return super.setVisible(visible, restart);
	}

	@Override
	public void setAlpha(int alpha) {
	mInsetState.mDrawable.setAlpha(alpha);
	}

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

	@Override
	public int getOpacity() {
	return mInsetState.mDrawable.getOpacity();
	}

	@Override
	public boolean isStateful() {
	return mInsetState.mDrawable.isStateful();
	}

	@Override
	protected boolean onStateChange(int[] state) {
	boolean changed = mInsetState.mDrawable.setState(state);
	onBoundsChange(getBounds());
	return changed;
	}

	@Override
	protected void onBoundsChange(Rect bounds) {
	final Rect r = mTmpRect;
	r.set(bounds);

	r.left += mInsetState.mInsetLeft;
	r.top += mInsetState.mInsetTop;
	r.right -= mInsetState.mInsetRight;
	r.bottom -= mInsetState.mInsetBottom;

	mInsetState.mDrawable.setBounds(r.left, r.top, r.right, r.bottom);
	}

	@Override
	public int getIntrinsicWidth() {
	return mInsetState.mDrawable.getIntrinsicWidth();
	}

	@Override
	public int getIntrinsicHeight() {
	return mInsetState.mDrawable.getIntrinsicHeight();
	}

	@Override
	public ConstantState getConstantState() {
	if (mInsetState.canConstantState()) {
	mInsetState.mChangingConfigurations = super.getChangingConfigurations();
	return mInsetState;
	}
	return null;
	}

	@Override
	public Drawable mutate() {
	if (!mMutated && super.mutate() == this) {
	mInsetState.mDrawable.mutate();
	mMutated = true;
	}
	return this;
	}

	final static class InsetState extends ConstantState {
	Drawable mDrawable;
	int mChangingConfigurations;

	int mInsetLeft;
	int mInsetTop;
	int mInsetRight;
	int mInsetBottom;

	boolean mCheckedConstantState;
	boolean mCanConstantState;

	InsetState(InsetState orig, InsetDrawable owner) {
	if (orig != null) {
	mDrawable = orig.mDrawable.getConstantState().newDrawable();
	mDrawable.setCallback(owner);
	mInsetLeft = orig.mInsetLeft;
	mInsetTop = orig.mInsetTop;
	mInsetRight = orig.mInsetRight;
	mInsetBottom = orig.mInsetBottom;
	mCheckedConstantState = mCanConstantState = true;
	}
	}

	@Override
	public Drawable newDrawable() {
	return new InsetDrawable(this);
	}

	@Override
	public int getChangingConfigurations() {
	return mChangingConfigurations;
	}

	boolean canConstantState() {
	if (!mCheckedConstantState) {
	mCanConstantState = mDrawable.getConstantState() != null;
	mCheckedConstantState = true;
	}

	return mCanConstantState;
	}
	}

	private InsetDrawable(InsetState state) {
	mInsetState = new InsetState(state, this);
	}
	}