| /* |
| * 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}. |
| * |
| * <p>This object can be defined in an XML file with the <code><shape></code> element.</p> |
| * |
| * <div class="special reference"> |
| * <h3>Developer Guides</h3> |
| * <p>For more information about how to use ShapeDrawable, read the |
| * <a href="{@docRoot}guide/topics/graphics/2d-graphics.html#shape-drawable"> |
| * Canvas and Drawables</a> document. For more information about defining a ShapeDrawable in |
| * XML, read the |
| * <a href="{@docRoot}guide/topics/resources/drawable-resource.html#Shape">Drawable Resources</a> |
| * document.</p></div> |
| * |
| * @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); |
| } |
| invalidateSelf(); |
| } |
| |
| /** |
| * 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); |
| } |
| invalidateSelf(); |
| } |
| |
| /** |
| * Sets the intrinsic (default) width for this shape. |
| * |
| * @param width the intrinsic width (in pixels) |
| */ |
| public void setIntrinsicWidth(int width) { |
| mShapeState.mIntrinsicWidth = width; |
| invalidateSelf(); |
| } |
| |
| /** |
| * Sets the intrinsic (default) height for this shape. |
| * |
| * @param height the intrinsic height (in pixels) |
| */ |
| public void setIntrinsicHeight(int height) { |
| mShapeState.mIntrinsicHeight = height; |
| invalidateSelf(); |
| } |
| |
| @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)); |
| |
| // only draw shape if it may affect output |
| if (paint.getAlpha() != 0 || paint.getXfermode() != null || paint.hasShadow) { |
| 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; |
| invalidateSelf(); |
| } |
| |
| @Override |
| public int getAlpha() { |
| return mShapeState.mAlpha; |
| } |
| |
| @Override |
| public void setColorFilter(ColorFilter cf) { |
| mShapeState.mPaint.setColorFilter(cf); |
| invalidateSelf(); |
| } |
| |
| @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); |
| invalidateSelf(); |
| } |
| |
| @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 ("padding".equals(name)) { |
| TypedArray a = r.obtainAttributes(attrs, |
| com.android.internal.R.styleable.ShapeDrawablePadding); |
| setPadding( |
| a.getDimensionPixelOffset( |
| com.android.internal.R.styleable.ShapeDrawablePadding_left, 0), |
| a.getDimensionPixelOffset( |
| com.android.internal.R.styleable.ShapeDrawablePadding_top, 0), |
| a.getDimensionPixelOffset( |
| com.android.internal.R.styleable.ShapeDrawablePadding_right, 0), |
| a.getDimensionPixelOffset( |
| 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); |
| |
| boolean dither = a.getBoolean(com.android.internal.R.styleable.ShapeDrawable_dither, false); |
| mShapeState.mPaint.setDither(dither); |
| |
| 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)); |
| } |
| } |
| invalidateSelf(); |
| } |
| |
| @Override |
| public ConstantState getConstantState() { |
| mShapeState.mChangingConfigurations = getChangingConfigurations(); |
| return mShapeState; |
| } |
| |
| @Override |
| public Drawable mutate() { |
| if (!mMutated && super.mutate() == this) { |
| if (mShapeState.mPaint != null) { |
| mShapeState.mPaint = new Paint(mShapeState.mPaint); |
| } else { |
| mShapeState.mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| } |
| if (mShapeState.mPadding != null) { |
| mShapeState.mPadding = new Rect(mShapeState.mPadding); |
| } else { |
| mShapeState.mPadding = new Rect(); |
| } |
| 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 Drawable newDrawable(Resources res) { |
| 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. |
| } |
| |