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

 /*
  * Copyright (C) 2015 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.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.res.ColorStateList;
 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Insets;
 import android.graphics.Outline;
 import android.graphics.PixelFormat;
 import android.graphics.PorterDuff;
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.view.View;

 import java.io.IOException;
 import java.util.Collection;

 /**
  * Drawable container with only one child element.
  */
 public abstract class DrawableWrapper extends Drawable implements Drawable.Callback {
     private DrawableWrapperState mState;
     private Drawable mDrawable;
     private boolean mMutated;

     DrawableWrapper(DrawableWrapperState state, Resources res) {
         mState = state;

         updateLocalState(res);
     }

     /**
      * Creates a new wrapper around the specified drawable.
      *
      * @param dr the drawable to wrap
      */
     public DrawableWrapper(@Nullable Drawable dr) {
         mState = null;
         mDrawable = dr;
     }

     /**
      * Initializes local dynamic properties from state. This should be called
      * after significant state changes, e.g. from the One True Constructor and
      * after inflating or applying a theme.
      */
     private void updateLocalState(Resources res) {
         if (mState != null && mState.mDrawableState != null) {
             final Drawable dr = mState.mDrawableState.newDrawable(res);
             setDrawable(dr);
         }
     }

     /**
      * Sets the wrapped drawable.
      *
      * @param dr the wrapped drawable
      */
     public void setDrawable(@Nullable Drawable dr) {
         if (mDrawable != null) {
             mDrawable.setCallback(null);
         }

         mDrawable = dr;

         if (dr != null) {
             dr.setCallback(this);

             // Only call setters for data that's stored in the base Drawable.
             dr.setVisible(isVisible(), true);
             dr.setState(getState());
             dr.setLevel(getLevel());
             dr.setBounds(getBounds());
             dr.setLayoutDirection(getLayoutDirection());

             if (mState != null) {
                 mState.mDrawableState = dr.getConstantState();
             }
         }

         invalidateSelf();
     }

     /**
      * @return the wrapped drawable
      */
     @Nullable
     public Drawable getDrawable() {
         return mDrawable;
     }

     void updateStateFromTypedArray(TypedArray a) {
         final DrawableWrapperState state = mState;
         if (state == null) {
             return;
         }

         // Account for any configuration changes.
         state.mChangingConfigurations |= a.getChangingConfigurations();

         // Extract the theme attributes, if any.
         state.mThemeAttrs = a.extractThemeAttrs();

         // TODO: Consider using R.styleable.DrawableWrapper_drawable
     }

     @Override
     public void applyTheme(Resources.Theme t) {
         super.applyTheme(t);

         final DrawableWrapperState state = mState;
         if (state == null) {
             return;
         }

         if (mDrawable != null && mDrawable.canApplyTheme()) {
             mDrawable.applyTheme(t);
         }
     }

     @Override
     public boolean canApplyTheme() {
         return (mState != null && mState.canApplyTheme()) || super.canApplyTheme();
     }

     @Override
     public void invalidateDrawable(Drawable who) {
         final Callback callback = getCallback();
         if (callback != null) {
             callback.invalidateDrawable(this);
         }
     }

     @Override
     public void scheduleDrawable(Drawable who, Runnable what, long when) {
         final Callback callback = getCallback();
         if (callback != null) {
             callback.scheduleDrawable(this, what, when);
         }
     }

     @Override
     public void unscheduleDrawable(Drawable who, Runnable what) {
         final Callback callback = getCallback();
         if (callback != null) {
             callback.unscheduleDrawable(this, what);
         }
     }

     @Override
     public void draw(@NonNull Canvas canvas) {
         if (mDrawable != null) {
             mDrawable.draw(canvas);
         }
     }

     @Override
     public int getChangingConfigurations() {
         return super.getChangingConfigurations()
                 | (mState != null ? mState.getChangingConfigurations() : 0)
                 | mDrawable.getChangingConfigurations();
     }

     @Override
     public boolean getPadding(@NonNull Rect padding) {
         return mDrawable != null && mDrawable.getPadding(padding);
     }

     /** @hide */
     @Override
     public Insets getOpticalInsets() {
         return mDrawable != null ? mDrawable.getOpticalInsets() : Insets.NONE;
     }

     @Override
     public void setHotspot(float x, float y) {
         if (mDrawable != null) {
             mDrawable.setHotspot(x, y);
         }
     }

     @Override
     public void setHotspotBounds(int left, int top, int right, int bottom) {
         if (mDrawable != null) {
             mDrawable.setHotspotBounds(left, top, right, bottom);
         }
     }

     @Override
     public void getHotspotBounds(@NonNull Rect outRect) {
         if (mDrawable != null) {
             mDrawable.getHotspotBounds(outRect);
         } else {
             outRect.set(getBounds());
         }
     }

     @Override
     public boolean setVisible(boolean visible, boolean restart) {
         final boolean superChanged = super.setVisible(visible, restart);
         final boolean changed = mDrawable != null && mDrawable.setVisible(visible, restart);
         return superChanged | changed;
     }

     @Override
     public void setAlpha(int alpha) {
         if (mDrawable != null) {
             mDrawable.setAlpha(alpha);
         }
     }

     @Override
     public int getAlpha() {
         return mDrawable != null ? mDrawable.getAlpha() : 255;
     }

     @Override
     public void setColorFilter(@Nullable ColorFilter colorFilter) {
         if (mDrawable != null) {
             mDrawable.setColorFilter(colorFilter);
         }
     }

     @Override
     public void setTintList(@Nullable ColorStateList tint) {
         if (mDrawable != null) {
             mDrawable.setTintList(tint);
         }
     }

     @Override
     public void setTintMode(@Nullable PorterDuff.Mode tintMode) {
         if (mDrawable != null) {
             mDrawable.setTintMode(tintMode);
         }
     }

     @Override
     public boolean onLayoutDirectionChanged(@View.ResolvedLayoutDir int layoutDirection) {
         return mDrawable != null && mDrawable.setLayoutDirection(layoutDirection);
     }

     @Override
     public int getOpacity() {
         return mDrawable != null ? mDrawable.getOpacity() : PixelFormat.TRANSPARENT;
     }

     @Override
     public boolean isStateful() {
         return mDrawable != null && mDrawable.isStateful();
     }

     @Override
     protected boolean onStateChange(int[] state) {
         if (mDrawable != null && mDrawable.isStateful()) {
             final boolean changed = mDrawable.setState(state);
             if (changed) {
                 onBoundsChange(getBounds());
             }
             return changed;
         }
         return false;
     }

     @Override
     protected boolean onLevelChange(int level) {
         return mDrawable != null && mDrawable.setLevel(level);
     }

     @Override
     protected void onBoundsChange(@NonNull Rect bounds) {
         if (mDrawable != null) {
             mDrawable.setBounds(bounds);
         }
     }

     @Override
     public int getIntrinsicWidth() {
         return mDrawable != null ? mDrawable.getIntrinsicWidth() : -1;
     }

     @Override
     public int getIntrinsicHeight() {
         return mDrawable != null ? mDrawable.getIntrinsicHeight() : -1;
     }

     @Override
     public void getOutline(@NonNull Outline outline) {
         if (mDrawable != null) {
             mDrawable.getOutline(outline);
         } else {
             super.getOutline(outline);
         }
     }

     @Override
     @Nullable
     public ConstantState getConstantState() {
         if (mState != null && mState.canConstantState()) {
             mState.mChangingConfigurations = getChangingConfigurations();
             return mState;
         }
         return null;
     }

     @Override
     @NonNull
     public Drawable mutate() {
         if (!mMutated && super.mutate() == this) {
             mState = mutateConstantState();
             if (mDrawable != null) {
                 mDrawable.mutate();
             }
             if (mState != null) {
                 mState.mDrawableState = mDrawable != null ? mDrawable.getConstantState() : null;
             }
             mMutated = true;
         }
         return this;
     }

     /**
      * Mutates the constant state and returns the new state. Responsible for
      * updating any local copy.
      * <p>
      * This method should never call the super implementation; it should always
      * mutate and return its own constant state.
      *
      * @return the new state
      */
     DrawableWrapperState mutateConstantState() {
         return mState;
     }

     /**
      * @hide Only used by the framework for pre-loading resources.
      */
     public void clearMutated() {
         super.clearMutated();
         if (mDrawable != null) {
             mDrawable.clearMutated();
         }
         mMutated = false;
     }

     /**
      * Called during inflation to inflate the child element. The last valid
      * child element will take precedence over any other child elements or
      * explicit drawable attribute.
      */
     void inflateChildDrawable(Resources r, XmlPullParser parser, AttributeSet attrs,
             Resources.Theme theme) throws XmlPullParserException, IOException {
         // Seek to the first child element.
         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) {
                 dr = Drawable.createFromXmlInner(r, parser, attrs, theme);
             }
         }

         if (dr != null) {
             setDrawable(dr);
         }
     }

     abstract static class DrawableWrapperState extends Drawable.ConstantState {
         int[] mThemeAttrs;
         int mChangingConfigurations;

         Drawable.ConstantState mDrawableState;

         DrawableWrapperState(DrawableWrapperState orig) {
             if (orig != null) {
                 mThemeAttrs = orig.mThemeAttrs;
                 mChangingConfigurations = orig.mChangingConfigurations;
                 mDrawableState = orig.mDrawableState;
             }
         }

         @Override
         public boolean canApplyTheme() {
             return mThemeAttrs != null
                     || (mDrawableState != null && mDrawableState.canApplyTheme())
                     || super.canApplyTheme();
         }

         @Override
         public int addAtlasableBitmaps(Collection<Bitmap> atlasList) {
             final Drawable.ConstantState state = mDrawableState;
             if (state != null) {
                 return state.addAtlasableBitmaps(atlasList);
             }
             return 0;
         }

         @Override
         public Drawable newDrawable() {
             return newDrawable(null);
         }

         @Override
         public abstract Drawable newDrawable(Resources res);

         @Override
         public int getChangingConfigurations() {
             return mChangingConfigurations
                     | (mDrawableState != null ? mDrawableState.getChangingConfigurations() : 0);
         }

         public boolean canConstantState() {
             return mDrawableState != null;
         }
     }
 }
	/*
	* Copyright (C) 2015 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.annotation.NonNull;
	import android.annotation.Nullable;
	import android.content.res.ColorStateList;
	import android.content.res.Resources;
	import android.content.res.TypedArray;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.ColorFilter;
	import android.graphics.Insets;
	import android.graphics.Outline;
	import android.graphics.PixelFormat;
	import android.graphics.PorterDuff;
	import android.graphics.Rect;
	import android.util.AttributeSet;
	import android.view.View;

	import java.io.IOException;
	import java.util.Collection;

	/**
	* Drawable container with only one child element.
	*/
	public abstract class DrawableWrapper extends Drawable implements Drawable.Callback {
	private DrawableWrapperState mState;
	private Drawable mDrawable;
	private boolean mMutated;

	DrawableWrapper(DrawableWrapperState state, Resources res) {
	mState = state;

	updateLocalState(res);
	}

	/**
	* Creates a new wrapper around the specified drawable.
	*
	* @param dr the drawable to wrap
	*/
	public DrawableWrapper(@Nullable Drawable dr) {
	mState = null;
	mDrawable = dr;
	}

	/**
	* Initializes local dynamic properties from state. This should be called
	* after significant state changes, e.g. from the One True Constructor and
	* after inflating or applying a theme.
	*/
	private void updateLocalState(Resources res) {
	if (mState != null && mState.mDrawableState != null) {
	final Drawable dr = mState.mDrawableState.newDrawable(res);
	setDrawable(dr);
	}
	}

	/**
	* Sets the wrapped drawable.
	*
	* @param dr the wrapped drawable
	*/
	public void setDrawable(@Nullable Drawable dr) {
	if (mDrawable != null) {
	mDrawable.setCallback(null);
	}

	mDrawable = dr;

	if (dr != null) {
	dr.setCallback(this);

	// Only call setters for data that's stored in the base Drawable.
	dr.setVisible(isVisible(), true);
	dr.setState(getState());
	dr.setLevel(getLevel());
	dr.setBounds(getBounds());
	dr.setLayoutDirection(getLayoutDirection());

	if (mState != null) {
	mState.mDrawableState = dr.getConstantState();
	}
	}

	invalidateSelf();
	}

	/**
	* @return the wrapped drawable
	*/
	@Nullable
	public Drawable getDrawable() {
	return mDrawable;
	}

	void updateStateFromTypedArray(TypedArray a) {
	final DrawableWrapperState state = mState;
	if (state == null) {
	return;
	}

	// Account for any configuration changes.
	state.mChangingConfigurations \|= a.getChangingConfigurations();

	// Extract the theme attributes, if any.
	state.mThemeAttrs = a.extractThemeAttrs();

	// TODO: Consider using R.styleable.DrawableWrapper_drawable
	}

	@Override
	public void applyTheme(Resources.Theme t) {
	super.applyTheme(t);

	final DrawableWrapperState state = mState;
	if (state == null) {
	return;
	}

	if (mDrawable != null && mDrawable.canApplyTheme()) {
	mDrawable.applyTheme(t);
	}
	}

	@Override
	public boolean canApplyTheme() {
	return (mState != null && mState.canApplyTheme()) \|\| super.canApplyTheme();
	}

	@Override
	public void invalidateDrawable(Drawable who) {
	final Callback callback = getCallback();
	if (callback != null) {
	callback.invalidateDrawable(this);
	}
	}

	@Override
	public void scheduleDrawable(Drawable who, Runnable what, long when) {
	final Callback callback = getCallback();
	if (callback != null) {
	callback.scheduleDrawable(this, what, when);
	}
	}

	@Override
	public void unscheduleDrawable(Drawable who, Runnable what) {
	final Callback callback = getCallback();
	if (callback != null) {
	callback.unscheduleDrawable(this, what);
	}
	}

	@Override
	public void draw(@NonNull Canvas canvas) {
	if (mDrawable != null) {
	mDrawable.draw(canvas);
	}
	}

	@Override
	public int getChangingConfigurations() {
	return super.getChangingConfigurations()
	\| (mState != null ? mState.getChangingConfigurations() : 0)
	\| mDrawable.getChangingConfigurations();
	}

	@Override
	public boolean getPadding(@NonNull Rect padding) {
	return mDrawable != null && mDrawable.getPadding(padding);
	}

	/** @hide */
	@Override
	public Insets getOpticalInsets() {
	return mDrawable != null ? mDrawable.getOpticalInsets() : Insets.NONE;
	}

	@Override
	public void setHotspot(float x, float y) {
	if (mDrawable != null) {
	mDrawable.setHotspot(x, y);
	}
	}

	@Override
	public void setHotspotBounds(int left, int top, int right, int bottom) {
	if (mDrawable != null) {
	mDrawable.setHotspotBounds(left, top, right, bottom);
	}
	}

	@Override
	public void getHotspotBounds(@NonNull Rect outRect) {
	if (mDrawable != null) {
	mDrawable.getHotspotBounds(outRect);
	} else {
	outRect.set(getBounds());
	}
	}

	@Override
	public boolean setVisible(boolean visible, boolean restart) {
	final boolean superChanged = super.setVisible(visible, restart);
	final boolean changed = mDrawable != null && mDrawable.setVisible(visible, restart);
	return superChanged \| changed;
	}

	@Override
	public void setAlpha(int alpha) {
	if (mDrawable != null) {
	mDrawable.setAlpha(alpha);
	}
	}

	@Override
	public int getAlpha() {
	return mDrawable != null ? mDrawable.getAlpha() : 255;
	}

	@Override
	public void setColorFilter(@Nullable ColorFilter colorFilter) {
	if (mDrawable != null) {
	mDrawable.setColorFilter(colorFilter);
	}
	}

	@Override
	public void setTintList(@Nullable ColorStateList tint) {
	if (mDrawable != null) {
	mDrawable.setTintList(tint);
	}
	}

	@Override
	public void setTintMode(@Nullable PorterDuff.Mode tintMode) {
	if (mDrawable != null) {
	mDrawable.setTintMode(tintMode);
	}
	}

	@Override
	public boolean onLayoutDirectionChanged(@View.ResolvedLayoutDir int layoutDirection) {
	return mDrawable != null && mDrawable.setLayoutDirection(layoutDirection);
	}

	@Override
	public int getOpacity() {
	return mDrawable != null ? mDrawable.getOpacity() : PixelFormat.TRANSPARENT;
	}

	@Override
	public boolean isStateful() {
	return mDrawable != null && mDrawable.isStateful();
	}

	@Override
	protected boolean onStateChange(int[] state) {
	if (mDrawable != null && mDrawable.isStateful()) {
	final boolean changed = mDrawable.setState(state);
	if (changed) {
	onBoundsChange(getBounds());
	}
	return changed;
	}
	return false;
	}

	@Override
	protected boolean onLevelChange(int level) {
	return mDrawable != null && mDrawable.setLevel(level);
	}

	@Override
	protected void onBoundsChange(@NonNull Rect bounds) {
	if (mDrawable != null) {
	mDrawable.setBounds(bounds);
	}
	}

	@Override
	public int getIntrinsicWidth() {
	return mDrawable != null ? mDrawable.getIntrinsicWidth() : -1;
	}

	@Override
	public int getIntrinsicHeight() {
	return mDrawable != null ? mDrawable.getIntrinsicHeight() : -1;
	}

	@Override
	public void getOutline(@NonNull Outline outline) {
	if (mDrawable != null) {
	mDrawable.getOutline(outline);
	} else {
	super.getOutline(outline);
	}
	}

	@Override
	@Nullable
	public ConstantState getConstantState() {
	if (mState != null && mState.canConstantState()) {
	mState.mChangingConfigurations = getChangingConfigurations();
	return mState;
	}
	return null;
	}

	@Override
	@NonNull
	public Drawable mutate() {
	if (!mMutated && super.mutate() == this) {
	mState = mutateConstantState();
	if (mDrawable != null) {
	mDrawable.mutate();
	}
	if (mState != null) {
	mState.mDrawableState = mDrawable != null ? mDrawable.getConstantState() : null;
	}
	mMutated = true;
	}
	return this;
	}

	/**
	* Mutates the constant state and returns the new state. Responsible for
	* updating any local copy.
	* <p>
	* This method should never call the super implementation; it should always
	* mutate and return its own constant state.
	*
	* @return the new state
	*/
	DrawableWrapperState mutateConstantState() {
	return mState;
	}

	/**
	* @hide Only used by the framework for pre-loading resources.
	*/
	public void clearMutated() {
	super.clearMutated();
	if (mDrawable != null) {
	mDrawable.clearMutated();
	}
	mMutated = false;
	}

	/**
	* Called during inflation to inflate the child element. The last valid
	* child element will take precedence over any other child elements or
	* explicit drawable attribute.
	*/
	void inflateChildDrawable(Resources r, XmlPullParser parser, AttributeSet attrs,
	Resources.Theme theme) throws XmlPullParserException, IOException {
	// Seek to the first child element.
	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) {
	dr = Drawable.createFromXmlInner(r, parser, attrs, theme);
	}
	}

	if (dr != null) {
	setDrawable(dr);
	}
	}

	abstract static class DrawableWrapperState extends Drawable.ConstantState {
	int[] mThemeAttrs;
	int mChangingConfigurations;

	Drawable.ConstantState mDrawableState;

	DrawableWrapperState(DrawableWrapperState orig) {
	if (orig != null) {
	mThemeAttrs = orig.mThemeAttrs;
	mChangingConfigurations = orig.mChangingConfigurations;
	mDrawableState = orig.mDrawableState;
	}
	}

	@Override
	public boolean canApplyTheme() {
	return mThemeAttrs != null
	\|\| (mDrawableState != null && mDrawableState.canApplyTheme())
	\|\| super.canApplyTheme();
	}

	@Override
	public int addAtlasableBitmaps(Collection<Bitmap> atlasList) {
	final Drawable.ConstantState state = mDrawableState;
	if (state != null) {
	return state.addAtlasableBitmaps(atlasList);
	}
	return 0;
	}

	@Override
	public Drawable newDrawable() {
	return newDrawable(null);
	}

	@Override
	public abstract Drawable newDrawable(Resources res);

	@Override
	public int getChangingConfigurations() {
	return mChangingConfigurations
	\| (mDrawableState != null ? mDrawableState.getChangingConfigurations() : 0);
	}

	public boolean canConstantState() {
	return mDrawableState != null;
	}
	}
	}