/*
* 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 android.graphics.*;
import android.graphics.drawable.shapes.Shape;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
/**
* A Drawable object that draws primitive shapes.
* A ShapeDrawable takes a {@link android.graphics.drawable.shapes.Shape}
* object and manages its presence on the screen. If no Shape is given, then
* the ShapeDrawable will default to a
* {@link android.graphics.drawable.shapes.RectShape}.
*
* @attr ref android.R.styleable#ShapeDrawablePadding_left
* @attr ref android.R.styleable#ShapeDrawablePadding_top
* @attr ref android.R.styleable#ShapeDrawablePadding_right
* @attr ref android.R.styleable#ShapeDrawablePadding_bottom
* @attr ref android.R.styleable#ShapeDrawable_color
* @attr ref android.R.styleable#ShapeDrawable_width
* @attr ref android.R.styleable#ShapeDrawable_height
*/
public class ShapeDrawable extends Drawable {
private ShapeState mShapeState;
private boolean mMutated;
/**
* ShapeDrawable constructor.
*/
public ShapeDrawable() {
this((ShapeState) null);
}
/**
* Creates a ShapeDrawable with a specified Shape.
*
* @param s the Shape that this ShapeDrawable should be
*/
public ShapeDrawable(Shape s) {
this((ShapeState) null);
mShapeState.mShape = s;
}
private ShapeDrawable(ShapeState state) {
mShapeState = new ShapeState(state);
}
/**
* Returns the Shape of this ShapeDrawable.
*/
public Shape getShape() {
return mShapeState.mShape;
}
/**
* Sets the Shape of this ShapeDrawable.
*/
public void setShape(Shape s) {
mShapeState.mShape = s;
updateShape();
}
/**
* Sets a ShaderFactory to which requests for a
* {@link android.graphics.Shader} object will be made.
*
* @param fact an instance of your ShaderFactory implementation
*/
public void setShaderFactory(ShaderFactory fact) {
mShapeState.mShaderFactory = fact;
}
/**
* Returns the ShaderFactory used by this ShapeDrawable for requesting a
* {@link android.graphics.Shader}.
*/
public ShaderFactory getShaderFactory() {
return mShapeState.mShaderFactory;
}
/**
* Returns the Paint used to draw the shape.
*/
public Paint getPaint() {
return mShapeState.mPaint;
}
/**
* Sets padding for the shape.
*
* @param left padding for the left side (in pixels)
* @param top padding for the top (in pixels)
* @param right padding for the right side (in pixels)
* @param bottom padding for the bottom (in pixels)
*/
public void setPadding(int left, int top, int right, int bottom) {
if ((left | top | right | bottom) == 0) {
mShapeState.mPadding = null;
} else {
if (mShapeState.mPadding == null) {
mShapeState.mPadding = new Rect();
}
mShapeState.mPadding.set(left, top, right, bottom);
}
}
/**
* Sets padding for this shape, defined by a Rect object.
* Define the padding in the Rect object as: left, top, right, bottom.
*/
public void setPadding(Rect padding) {
if (padding == null) {
mShapeState.mPadding = null;
} else {
if (mShapeState.mPadding == null) {
mShapeState.mPadding = new Rect();
}
mShapeState.mPadding.set(padding);
}
}
/**
* Sets the intrinsic (default) width for this shape.
*
* @param width the intrinsic width (in pixels)
*/
public void setIntrinsicWidth(int width) {
mShapeState.mIntrinsicWidth = width;
}
/**
* Sets the intrinsic (default) height for this shape.
*
* @param height the intrinsic height (in pixels)
*/
public void setIntrinsicHeight(int height) {
mShapeState.mIntrinsicHeight = height;
}
@Override
public int getIntrinsicWidth() {
return mShapeState.mIntrinsicWidth;
}
@Override
public int getIntrinsicHeight() {
return mShapeState.mIntrinsicHeight;
}
@Override
public boolean getPadding(Rect padding) {
if (mShapeState.mPadding != null) {
padding.set(mShapeState.mPadding);
return true;
} else {
return super.getPadding(padding);
}
}
private static int modulateAlpha(int paintAlpha, int alpha) {
int scale = alpha + (alpha >>> 7); // convert to 0..256
return paintAlpha * scale >>> 8;
}
/**
* Called from the drawable's draw() method after the canvas has been set
* to draw the shape at (0,0). Subclasses can override for special effects
* such as multiple layers, stroking, etc.
*/
protected void onDraw(Shape shape, Canvas canvas, Paint paint) {
shape.draw(canvas, paint);
}
@Override
public void draw(Canvas canvas) {
Rect r = getBounds();
Paint paint = mShapeState.mPaint;
int prevAlpha = paint.getAlpha();
paint.setAlpha(modulateAlpha(prevAlpha, mShapeState.mAlpha));
if (mShapeState.mShape != null) {
// need the save both for the translate, and for the (unknown) Shape
int count = canvas.save();
canvas.translate(r.left, r.top);
onDraw(mShapeState.mShape, canvas, paint);
canvas.restoreToCount(count);
} else {
canvas.drawRect(r, paint);
}
// restore
paint.setAlpha(prevAlpha);
}
@Override
public int getChangingConfigurations() {
return super.getChangingConfigurations()
| mShapeState.mChangingConfigurations;
}
/**
* Set the alpha level for this drawable [0..255]. Note that this drawable
* also has a color in its paint, which has an alpha as well. These two
* values are automatically combined during drawing. Thus if the color's
* alpha is 75% (i.e. 192) and the drawable's alpha is 50% (i.e. 128), then
* the combined alpha that will be used during drawing will be 37.5%
* (i.e. 96).
*/
@Override public void setAlpha(int alpha) {
mShapeState.mAlpha = alpha;
}
@Override
public void setColorFilter(ColorFilter cf) {
mShapeState.mPaint.setColorFilter(cf);
}
@Override
public int getOpacity() {
if (mShapeState.mShape == null) {
final Paint p = mShapeState.mPaint;
if (p.getXfermode() == null) {
final int alpha = p.getAlpha();
if (alpha == 0) {
return PixelFormat.TRANSPARENT;
}
if (alpha == 255) {
return PixelFormat.OPAQUE;
}
}
}
// not sure, so be safe
return PixelFormat.TRANSLUCENT;
}
@Override
public void setDither(boolean dither) {
mShapeState.mPaint.setDither(dither);
}
@Override
protected void onBoundsChange(Rect bounds) {
super.onBoundsChange(bounds);
updateShape();
}
/**
* Subclasses override this to parse custom subelements.
* If you handle it, return true, else return <em>super.inflateTag(...)</em>.
*/
protected boolean inflateTag(String name, Resources r, XmlPullParser parser,
AttributeSet attrs) {
if (name.equals("padding")) {
TypedArray a = r.obtainAttributes(attrs,
com.android.internal.R.styleable.ShapeDrawablePadding);
setPadding(a.getInt(com.android.internal.R.styleable.ShapeDrawablePadding_left, 0),
a.getInt(com.android.internal.R.styleable.ShapeDrawablePadding_top, 0),
a.getInt(com.android.internal.R.styleable.ShapeDrawablePadding_right, 0),
a.getInt(com.android.internal.R.styleable.ShapeDrawablePadding_bottom, 0));
a.recycle();
return true;
}
return false;
}
@Override
public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
throws XmlPullParserException, IOException {
super.inflate(r, parser, attrs);
TypedArray a = r.obtainAttributes(attrs, com.android.internal.R.styleable.ShapeDrawable);
int color = mShapeState.mPaint.getColor();
color = a.getColor(com.android.internal.R.styleable.ShapeDrawable_color, color);
mShapeState.mPaint.setColor(color);
setIntrinsicWidth((int)
a.getDimension(com.android.internal.R.styleable.ShapeDrawable_width, 0f));
setIntrinsicHeight((int)
a.getDimension(com.android.internal.R.styleable.ShapeDrawable_height, 0f));
a.recycle();
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;
}
final String name = parser.getName();
// call our subclass
if (!inflateTag(name, r, parser, attrs)) {
android.util.Log.w("drawable", "Unknown element: " + name +
" for ShapeDrawable " + this);
}
}
}
private void updateShape() {
if (mShapeState.mShape != null) {
final Rect r = getBounds();
final int w = r.width();
final int h = r.height();
mShapeState.mShape.resize(w, h);
if (mShapeState.mShaderFactory != null) {
mShapeState.mPaint.setShader(mShapeState.mShaderFactory.resize(w, h));
}
}
}
@Override
public ConstantState getConstantState() {
mShapeState.mChangingConfigurations = super.getChangingConfigurations();
return mShapeState;
}
@Override
public Drawable mutate() {
if (!mMutated && super.mutate() == this) {
mShapeState.mPaint = new Paint(mShapeState.mPaint);
mShapeState.mPadding = new Rect(mShapeState.mPadding);
try {
mShapeState.mShape = mShapeState.mShape.clone();
} catch (CloneNotSupportedException e) {
return null;
}
mMutated = true;
}
return this;
}
/**
* Defines the intrinsic properties of this ShapeDrawable's Shape.
*/
final static class ShapeState extends ConstantState {
int mChangingConfigurations;
Paint mPaint;
Shape mShape;
Rect mPadding;
int mIntrinsicWidth;
int mIntrinsicHeight;
int mAlpha = 255;
ShaderFactory mShaderFactory;
ShapeState(ShapeState orig) {
if (orig != null) {
mPaint = orig.mPaint;
mShape = orig.mShape;
mPadding = orig.mPadding;
mIntrinsicWidth = orig.mIntrinsicWidth;
mIntrinsicHeight = orig.mIntrinsicHeight;
mAlpha = orig.mAlpha;
mShaderFactory = orig.mShaderFactory;
} else {
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
}
}
@Override
public Drawable newDrawable() {
return new ShapeDrawable(this);
}
@Override
public int getChangingConfigurations() {
return mChangingConfigurations;
}
}
/**
* Base class defines a factory object that is called each time the drawable
* is resized (has a new width or height). Its resize() method returns a
* corresponding shader, or null.
* Implement this class if you'd like your ShapeDrawable to use a special
* {@link android.graphics.Shader}, such as a
* {@link android.graphics.LinearGradient}.
*
*/
public static abstract class ShaderFactory {
/**
* Returns the Shader to be drawn when a Drawable is drawn.
* The dimensions of the Drawable are passed because they may be needed
* to adjust how the Shader is configured for drawing.
* This is called by ShapeDrawable.setShape().
*
* @param width the width of the Drawable being drawn
* @param height the heigh of the Drawable being drawn
* @return the Shader to be drawn
*/
public abstract Shader resize(int width, int height);
}
// other subclass could wack the Shader's localmatrix based on the
// resize params (e.g. scaletofit, etc.). This could be used to scale
// a bitmap to fill the bounds without needing any other special casing.
}
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