/*
* Copyright (C) 2007 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.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Rect;
import android.graphics.PorterDuff.Mode;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.Resources.Theme;
import android.util.TypedValue;
import android.util.AttributeSet;
import java.io.IOException;
/**
* <p>
* A Drawable that can rotate another Drawable based on the current level value.
* The start and end angles of rotation can be controlled to map any circular
* arc to the level values range.
* <p>
* It can be defined in an XML file with the <code><rotate></code> element.
* For more information, see the guide to
* <a href="{@docRoot}guide/topics/resources/animation-resource.html">Animation Resources</a>.
*
* @attr ref android.R.styleable#RotateDrawable_visible
* @attr ref android.R.styleable#RotateDrawable_fromDegrees
* @attr ref android.R.styleable#RotateDrawable_toDegrees
* @attr ref android.R.styleable#RotateDrawable_pivotX
* @attr ref android.R.styleable#RotateDrawable_pivotY
* @attr ref android.R.styleable#RotateDrawable_drawable
*/
public class RotateDrawable extends Drawable implements Drawable.Callback {
private static final float MAX_LEVEL = 10000.0f;
private final RotateState mState;
private boolean mMutated;
/**
* Create a new rotating drawable with an empty state.
*/
public RotateDrawable() {
this(null, null);
}
/**
* Create a new rotating drawable with the specified state. A copy of
* this state is used as the internal state for the newly created
* drawable.
*
* @param rotateState the state for this drawable
*/
private RotateDrawable(RotateState rotateState, Resources res) {
mState = new RotateState(rotateState, this, res);
}
@Override
public void draw(Canvas canvas) {
final RotateState st = mState;
final Drawable d = st.mDrawable;
final Rect bounds = d.getBounds();
final int w = bounds.right - bounds.left;
final int h = bounds.bottom - bounds.top;
final float px = st.mPivotXRel ? (w * st.mPivotX) : st.mPivotX;
final float py = st.mPivotYRel ? (h * st.mPivotY) : st.mPivotY;
final int saveCount = canvas.save();
canvas.rotate(st.mCurrentDegrees, px + bounds.left, py + bounds.top);
d.draw(canvas);
canvas.restoreToCount(saveCount);
}
/**
* Sets the drawable rotated by this RotateDrawable.
*
* @param drawable The drawable to rotate
*/
public void setDrawable(Drawable drawable) {
final Drawable oldDrawable = mState.mDrawable;
if (oldDrawable != drawable) {
if (oldDrawable != null) {
oldDrawable.setCallback(null);
}
mState.mDrawable = drawable;
if (drawable != null) {
drawable.setCallback(this);
}
}
}
/**
* @return The drawable rotated by this RotateDrawable
*/
public Drawable getDrawable() {
return mState.mDrawable;
}
@Override
public int getChangingConfigurations() {
return super.getChangingConfigurations()
| mState.mChangingConfigurations
| mState.mDrawable.getChangingConfigurations();
}
@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();
}
/**
* Sets the start angle for rotation.
*
* @param fromDegrees Starting angle in degrees
*
* @see #getFromDegrees()
* @attr ref android.R.styleable#RotateDrawable_fromDegrees
*/
public void setFromDegrees(float fromDegrees) {
if (mState.mFromDegrees != fromDegrees) {
mState.mFromDegrees = fromDegrees;
invalidateSelf();
}
}
/**
* @return The starting angle for rotation in degrees
*
* @see #setFromDegrees(float)
* @attr ref android.R.styleable#RotateDrawable_fromDegrees
*/
public float getFromDegrees() {
return mState.mFromDegrees;
}
/**
* Sets the end angle for rotation.
*
* @param toDegrees Ending angle in degrees
*
* @see #getToDegrees()
* @attr ref android.R.styleable#RotateDrawable_toDegrees
*/
public void setToDegrees(float toDegrees) {
if (mState.mToDegrees != toDegrees) {
mState.mToDegrees = toDegrees;
invalidateSelf();
}
}
/**
* @return The ending angle for rotation in degrees
*
* @see #setToDegrees(float)
* @attr ref android.R.styleable#RotateDrawable_toDegrees
*/
public float getToDegrees() {
return mState.mToDegrees;
}
/**
* Sets the X position around which the drawable is rotated.
*
* @param pivotX X position around which to rotate. If the X pivot is
* relative, the position represents a fraction of the drawable
* width. Otherwise, the position represents an absolute value in
* pixels.
*
* @see #setPivotXRelative(boolean)
* @attr ref android.R.styleable#RotateDrawable_pivotX
*/
public void setPivotX(float pivotX) {
if (mState.mPivotX != pivotX) {
mState.mPivotX = pivotX;
invalidateSelf();
}
}
/**
* @return X position around which to rotate
*
* @see #setPivotX(float)
* @attr ref android.R.styleable#RotateDrawable_pivotX
*/
public float getPivotX() {
return mState.mPivotX;
}
/**
* Sets whether the X pivot value represents a fraction of the drawable
* width or an absolute value in pixels.
*
* @param relative True if the X pivot represents a fraction of the drawable
* width, or false if it represents an absolute value in pixels
*
* @see #isPivotXRelative()
*/
public void setPivotXRelative(boolean relative) {
if (mState.mPivotXRel != relative) {
mState.mPivotXRel = relative;
invalidateSelf();
}
}
/**
* @return True if the X pivot represents a fraction of the drawable width,
* or false if it represents an absolute value in pixels
*
* @see #setPivotXRelative(boolean)
*/
public boolean isPivotXRelative() {
return mState.mPivotXRel;
}
/**
* Sets the Y position around which the drawable is rotated.
*
* @param pivotY Y position around which to rotate. If the Y pivot is
* relative, the position represents a fraction of the drawable
* height. Otherwise, the position represents an absolute value
* in pixels.
*
* @see #getPivotY()
* @attr ref android.R.styleable#RotateDrawable_pivotY
*/
public void setPivotY(float pivotY) {
if (mState.mPivotY != pivotY) {
mState.mPivotY = pivotY;
invalidateSelf();
}
}
/**
* @return Y position around which to rotate
*
* @see #setPivotY(float)
* @attr ref android.R.styleable#RotateDrawable_pivotY
*/
public float getPivotY() {
return mState.mPivotY;
}
/**
* Sets whether the Y pivot value represents a fraction of the drawable
* height or an absolute value in pixels.
*
* @param relative True if the Y pivot represents a fraction of the drawable
* height, or false if it represents an absolute value in pixels
*
* @see #isPivotYRelative()
*/
public void setPivotYRelative(boolean relative) {
if (mState.mPivotYRel != relative) {
mState.mPivotYRel = relative;
invalidateSelf();
}
}
/**
* @return True if the Y pivot represents a fraction of the drawable height,
* or false if it represents an absolute value in pixels
*
* @see #setPivotYRelative(boolean)
*/
public boolean isPivotYRelative() {
return mState.mPivotYRel;
}
@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 boolean getPadding(Rect 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 boolean isStateful() {
return mState.mDrawable.isStateful();
}
@Override
protected boolean onStateChange(int[] state) {
final boolean changed = mState.mDrawable.setState(state);
onBoundsChange(getBounds());
return changed;
}
@Override
protected boolean onLevelChange(int level) {
mState.mDrawable.setLevel(level);
onBoundsChange(getBounds());
mState.mCurrentDegrees = mState.mFromDegrees +
(mState.mToDegrees - mState.mFromDegrees) *
(level / MAX_LEVEL);
invalidateSelf();
return true;
}
@Override
protected void onBoundsChange(Rect bounds) {
mState.mDrawable.setBounds(bounds.left, bounds.top,
bounds.right, bounds.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 void inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Theme theme)
throws XmlPullParserException, IOException {
final TypedArray a = obtainAttributes(r, theme, attrs, R.styleable.RotateDrawable);
super.inflateWithAttributes(r, parser, a, R.styleable.RotateDrawable_visible);
// 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 RotateState state = mState;
if (state == null) {
return;
}
if (state.mThemeAttrs != null) {
final TypedArray a = t.resolveAttributes(state.mThemeAttrs, R.styleable.RotateDrawable);
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()
+ ": <rotate> tag requires a 'drawable' attribute or "
+ "child tag defining a drawable");
}
}
private void updateStateFromTypedArray(TypedArray a) {
final RotateState state = mState;
// Account for any configuration changes.
state.mChangingConfigurations |= a.getChangingConfigurations();
// Extract the theme attributes, if any.
state.mThemeAttrs = a.extractThemeAttrs();
if (a.hasValue(R.styleable.RotateDrawable_pivotX)) {
final TypedValue tv = a.peekValue(R.styleable.RotateDrawable_pivotX);
state.mPivotXRel = tv.type == TypedValue.TYPE_FRACTION;
state.mPivotX = state.mPivotXRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat();
}
if (a.hasValue(R.styleable.RotateDrawable_pivotY)) {
final TypedValue tv = a.peekValue(R.styleable.RotateDrawable_pivotY);
state.mPivotYRel = tv.type == TypedValue.TYPE_FRACTION;
state.mPivotY = state.mPivotYRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat();
}
state.mFromDegrees = a.getFloat(R.styleable.RotateDrawable_fromDegrees, state.mFromDegrees);
state.mToDegrees = a.getFloat(R.styleable.RotateDrawable_toDegrees, state.mToDegrees);
state.mCurrentDegrees = state.mFromDegrees;
final Drawable dr = a.getDrawable(R.styleable.RotateDrawable_drawable);
if (dr != null) {
state.mDrawable = dr;
dr.setCallback(this);
}
}
@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;
}
/**
* Represents the state of a rotation for a given drawable. The same
* rotate drawable can be invoked with different states to drive several
* rotations at the same time.
*/
final static class RotateState extends Drawable.ConstantState {
int[] mThemeAttrs;
int mChangingConfigurations;
Drawable mDrawable;
boolean mPivotXRel = true;
float mPivotX = 0.5f;
boolean mPivotYRel = true;
float mPivotY = 0.5f;
float mFromDegrees = 0.0f;
float mToDegrees = 360.0f;
float mCurrentDegrees = 0.0f;
private boolean mCheckedConstantState;
private boolean mCanConstantState;
RotateState(RotateState orig, RotateDrawable 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());
mPivotXRel = orig.mPivotXRel;
mPivotX = orig.mPivotX;
mPivotYRel = orig.mPivotYRel;
mPivotY = orig.mPivotY;
mFromDegrees = orig.mFromDegrees;
mToDegrees = orig.mToDegrees;
mCurrentDegrees = orig.mCurrentDegrees;
mCheckedConstantState = mCanConstantState = true;
}
}
@Override
public boolean canApplyTheme() {
return mThemeAttrs != null || (mDrawable != null && mDrawable.canApplyTheme())
|| super.canApplyTheme();
}
@Override
public Drawable newDrawable() {
return new RotateDrawable(this, null);
}
@Override
public Drawable newDrawable(Resources res) {
return new RotateDrawable(this, res);
}
@Override
public int getChangingConfigurations() {
return mChangingConfigurations;
}
public boolean canConstantState() {
if (!mCheckedConstantState) {
mCanConstantState = mDrawable.getConstantState() != null;
mCheckedConstantState = true;
}
return mCanConstantState;
}
}
}
|
