| /* |
| * 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); |
| } |
| } |
| |