/*
* 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 org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Rect;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.TypedValue;
import android.util.AttributeSet;
import android.util.Log;
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>
*
* <p>It can be defined in an XML file with the <code><rotate></code> element.</p>
*
* @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 RotateState mState;
private boolean mMutated;
/**
* <p>Create a new rotating drawable with an empty state.</p>
*/
public RotateDrawable() {
this(null);
}
/**
* <p>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.</p>
*
* @param rotateState the state for this drawable
*/
private RotateDrawable(RotateState rotateState) {
mState = new RotateState(rotateState, this);
}
public void draw(Canvas canvas) {
int saveCount = canvas.save();
Rect bounds = mState.mDrawable.getBounds();
int w = bounds.right - bounds.left;
int h = bounds.bottom - bounds.top;
final RotateState st = mState;
float px = st.mPivotXRel ? (w * st.mPivotX) : st.mPivotX;
float py = st.mPivotYRel ? (h * st.mPivotY) : st.mPivotY;
canvas.rotate(st.mCurrentDegrees, px, py);
st.mDrawable.draw(canvas);
canvas.restoreToCount(saveCount);
}
/**
* Returns the drawable rotated by this RotateDrawable.
*/
public Drawable getDrawable() {
return mState.mDrawable;
}
@Override
public int getChangingConfigurations() {
return super.getChangingConfigurations()
| mState.mChangingConfigurations
| mState.mDrawable.getChangingConfigurations();
}
public void setAlpha(int alpha) {
mState.mDrawable.setAlpha(alpha);
}
public void setColorFilter(ColorFilter cf) {
mState.mDrawable.setColorFilter(cf);
}
public int getOpacity() {
return mState.mDrawable.getOpacity();
}
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);
}
}
@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) {
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) *
((float) 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 = super.getChangingConfigurations();
return mState;
}
return null;
}
@Override
public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
throws XmlPullParserException, IOException {
TypedArray a = r.obtainAttributes(attrs,
com.android.internal.R.styleable.RotateDrawable);
super.inflateWithAttributes(r, parser, a,
com.android.internal.R.styleable.RotateDrawable_visible);
TypedValue tv = a.peekValue(com.android.internal.R.styleable.RotateDrawable_pivotX);
boolean pivotXRel = tv.type == TypedValue.TYPE_FRACTION;
float pivotX = pivotXRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat();
tv = a.peekValue(com.android.internal.R.styleable.RotateDrawable_pivotY);
boolean pivotYRel = tv.type == TypedValue.TYPE_FRACTION;
float pivotY = pivotYRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat();
float fromDegrees = a.getFloat(
com.android.internal.R.styleable.RotateDrawable_fromDegrees, 0.0f);
float toDegrees = a.getFloat(
com.android.internal.R.styleable.RotateDrawable_toDegrees, 360.0f);
toDegrees = Math.max(fromDegrees, toDegrees);
int res = a.getResourceId(
com.android.internal.R.styleable.RotateDrawable_drawable, 0);
Drawable drawable = null;
if (res > 0) {
drawable = r.getDrawable(res);
}
a.recycle();
int outerDepth = parser.getDepth();
int type;
while ((type = parser.next()) != XmlPullParser.END_DOCUMENT &&
(type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
if (type != XmlPullParser.START_TAG) {
continue;
}
if ((drawable = Drawable.createFromXmlInner(r, parser, attrs)) == null) {
Log.w("drawable", "Bad element under <rotate>: "
+ parser .getName());
}
}
if (drawable == null) {
Log.w("drawable", "No drawable specified for <rotate>");
}
mState.mDrawable = drawable;
mState.mPivotXRel = pivotXRel;
mState.mPivotX = pivotX;
mState.mPivotYRel = pivotYRel;
mState.mPivotY = pivotY;
mState.mFromDegrees = mState.mCurrentDegrees = fromDegrees;
mState.mToDegrees = toDegrees;
if (drawable != null) {
drawable.setCallback(this);
}
}
@Override
public Drawable mutate() {
if (!mMutated && super.mutate() == this) {
mState.mDrawable.mutate();
mMutated = true;
}
return this;
}
/**
* <p>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.</p>
*/
final static class RotateState extends Drawable.ConstantState {
Drawable mDrawable;
int mChangingConfigurations;
boolean mPivotXRel;
float mPivotX;
boolean mPivotYRel;
float mPivotY;
float mFromDegrees;
float mToDegrees;
float mCurrentDegrees;
private boolean mCanConstantState;
private boolean mCheckedConstantState;
public RotateState(RotateState source, RotateDrawable owner) {
if (source != null) {
mDrawable = source.mDrawable.getConstantState().newDrawable();
mDrawable.setCallback(owner);
mPivotXRel = source.mPivotXRel;
mPivotX = source.mPivotX;
mPivotYRel = source.mPivotYRel;
mPivotY = source.mPivotY;
mFromDegrees = mCurrentDegrees = source.mFromDegrees;
mToDegrees = source.mToDegrees;
mCanConstantState = mCheckedConstantState = true;
}
}
@Override
public Drawable newDrawable() {
return new RotateDrawable(this);
}
@Override
public int getChangingConfigurations() {
return mChangingConfigurations;
}
public boolean canConstantState() {
if (!mCheckedConstantState) {
mCanConstantState = mDrawable.getConstantState() != null;
mCheckedConstantState = true;
}
return mCanConstantState;
}
}
}
|
