467 lines
15 KiB
Java
467 lines
15 KiB
Java
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics.drawable;
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import android.graphics.*;
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import android.graphics.drawable.shapes.Shape;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import java.io.IOException;
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/**
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* A Drawable object that draws primitive shapes.
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* A ShapeDrawable takes a {@link android.graphics.drawable.shapes.Shape}
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* object and manages its presence on the screen. If no Shape is given, then
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* the ShapeDrawable will default to a
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* {@link android.graphics.drawable.shapes.RectShape}.
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*
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* <p>This object can be defined in an XML file with the <code><shape></code> element.</p>
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*
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* <div class="special reference">
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* <h3>Developer Guides</h3>
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* <p>For more information about how to use ShapeDrawable, read the
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* <a href="{@docRoot}guide/topics/graphics/2d-graphics.html#shape-drawable">
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* Canvas and Drawables</a> document. For more information about defining a ShapeDrawable in
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* XML, read the
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* <a href="{@docRoot}guide/topics/resources/drawable-resource.html#Shape">Drawable Resources</a>
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* document.</p></div>
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*
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* @attr ref android.R.styleable#ShapeDrawablePadding_left
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* @attr ref android.R.styleable#ShapeDrawablePadding_top
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* @attr ref android.R.styleable#ShapeDrawablePadding_right
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* @attr ref android.R.styleable#ShapeDrawablePadding_bottom
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* @attr ref android.R.styleable#ShapeDrawable_color
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* @attr ref android.R.styleable#ShapeDrawable_width
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* @attr ref android.R.styleable#ShapeDrawable_height
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*/
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public class ShapeDrawable extends Drawable {
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private ShapeState mShapeState;
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private boolean mMutated;
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/**
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* ShapeDrawable constructor.
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*/
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public ShapeDrawable() {
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this((ShapeState) null);
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}
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/**
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* Creates a ShapeDrawable with a specified Shape.
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*
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* @param s the Shape that this ShapeDrawable should be
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*/
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public ShapeDrawable(Shape s) {
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this((ShapeState) null);
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mShapeState.mShape = s;
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}
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private ShapeDrawable(ShapeState state) {
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mShapeState = new ShapeState(state);
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}
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/**
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* Returns the Shape of this ShapeDrawable.
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*/
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public Shape getShape() {
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return mShapeState.mShape;
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}
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/**
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* Sets the Shape of this ShapeDrawable.
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*/
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public void setShape(Shape s) {
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mShapeState.mShape = s;
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updateShape();
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}
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/**
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* Sets a ShaderFactory to which requests for a
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* {@link android.graphics.Shader} object will be made.
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*
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* @param fact an instance of your ShaderFactory implementation
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*/
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public void setShaderFactory(ShaderFactory fact) {
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mShapeState.mShaderFactory = fact;
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}
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/**
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* Returns the ShaderFactory used by this ShapeDrawable for requesting a
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* {@link android.graphics.Shader}.
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*/
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public ShaderFactory getShaderFactory() {
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return mShapeState.mShaderFactory;
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}
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/**
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* Returns the Paint used to draw the shape.
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*/
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public Paint getPaint() {
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return mShapeState.mPaint;
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}
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/**
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* Sets padding for the shape.
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*
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* @param left padding for the left side (in pixels)
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* @param top padding for the top (in pixels)
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* @param right padding for the right side (in pixels)
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* @param bottom padding for the bottom (in pixels)
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*/
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public void setPadding(int left, int top, int right, int bottom) {
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if ((left | top | right | bottom) == 0) {
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mShapeState.mPadding = null;
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} else {
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if (mShapeState.mPadding == null) {
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mShapeState.mPadding = new Rect();
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}
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mShapeState.mPadding.set(left, top, right, bottom);
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}
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invalidateSelf();
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}
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/**
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* Sets padding for this shape, defined by a Rect object.
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* Define the padding in the Rect object as: left, top, right, bottom.
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*/
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public void setPadding(Rect padding) {
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if (padding == null) {
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mShapeState.mPadding = null;
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} else {
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if (mShapeState.mPadding == null) {
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mShapeState.mPadding = new Rect();
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}
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mShapeState.mPadding.set(padding);
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}
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invalidateSelf();
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}
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/**
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* Sets the intrinsic (default) width for this shape.
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*
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* @param width the intrinsic width (in pixels)
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*/
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public void setIntrinsicWidth(int width) {
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mShapeState.mIntrinsicWidth = width;
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invalidateSelf();
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}
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/**
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* Sets the intrinsic (default) height for this shape.
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*
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* @param height the intrinsic height (in pixels)
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*/
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public void setIntrinsicHeight(int height) {
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mShapeState.mIntrinsicHeight = height;
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invalidateSelf();
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}
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@Override
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public int getIntrinsicWidth() {
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return mShapeState.mIntrinsicWidth;
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}
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@Override
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public int getIntrinsicHeight() {
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return mShapeState.mIntrinsicHeight;
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}
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@Override
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public boolean getPadding(Rect padding) {
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if (mShapeState.mPadding != null) {
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padding.set(mShapeState.mPadding);
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return true;
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} else {
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return super.getPadding(padding);
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}
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}
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private static int modulateAlpha(int paintAlpha, int alpha) {
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int scale = alpha + (alpha >>> 7); // convert to 0..256
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return paintAlpha * scale >>> 8;
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}
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/**
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* Called from the drawable's draw() method after the canvas has been set
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* to draw the shape at (0,0). Subclasses can override for special effects
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* such as multiple layers, stroking, etc.
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*/
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protected void onDraw(Shape shape, Canvas canvas, Paint paint) {
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shape.draw(canvas, paint);
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}
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@Override
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public void draw(Canvas canvas) {
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Rect r = getBounds();
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Paint paint = mShapeState.mPaint;
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int prevAlpha = paint.getAlpha();
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paint.setAlpha(modulateAlpha(prevAlpha, mShapeState.mAlpha));
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if (mShapeState.mShape != null) {
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// need the save both for the translate, and for the (unknown) Shape
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int count = canvas.save();
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canvas.translate(r.left, r.top);
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onDraw(mShapeState.mShape, canvas, paint);
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canvas.restoreToCount(count);
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} else {
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canvas.drawRect(r, paint);
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}
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// restore
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paint.setAlpha(prevAlpha);
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}
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@Override
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public int getChangingConfigurations() {
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return super.getChangingConfigurations()
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| mShapeState.mChangingConfigurations;
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}
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/**
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* Set the alpha level for this drawable [0..255]. Note that this drawable
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* also has a color in its paint, which has an alpha as well. These two
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* values are automatically combined during drawing. Thus if the color's
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* alpha is 75% (i.e. 192) and the drawable's alpha is 50% (i.e. 128), then
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* the combined alpha that will be used during drawing will be 37.5%
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* (i.e. 96).
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*/
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@Override public void setAlpha(int alpha) {
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mShapeState.mAlpha = alpha;
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invalidateSelf();
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}
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@Override
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public void setColorFilter(ColorFilter cf) {
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mShapeState.mPaint.setColorFilter(cf);
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invalidateSelf();
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}
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@Override
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public int getOpacity() {
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if (mShapeState.mShape == null) {
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final Paint p = mShapeState.mPaint;
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if (p.getXfermode() == null) {
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final int alpha = p.getAlpha();
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if (alpha == 0) {
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return PixelFormat.TRANSPARENT;
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}
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if (alpha == 255) {
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return PixelFormat.OPAQUE;
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}
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}
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}
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// not sure, so be safe
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return PixelFormat.TRANSLUCENT;
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}
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@Override
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public void setDither(boolean dither) {
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mShapeState.mPaint.setDither(dither);
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invalidateSelf();
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}
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@Override
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protected void onBoundsChange(Rect bounds) {
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super.onBoundsChange(bounds);
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updateShape();
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}
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/**
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* Subclasses override this to parse custom subelements.
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* If you handle it, return true, else return <em>super.inflateTag(...)</em>.
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*/
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protected boolean inflateTag(String name, Resources r, XmlPullParser parser,
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AttributeSet attrs) {
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if ("padding".equals(name)) {
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TypedArray a = r.obtainAttributes(attrs,
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com.android.internal.R.styleable.ShapeDrawablePadding);
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setPadding(
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a.getDimensionPixelOffset(
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com.android.internal.R.styleable.ShapeDrawablePadding_left, 0),
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a.getDimensionPixelOffset(
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com.android.internal.R.styleable.ShapeDrawablePadding_top, 0),
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a.getDimensionPixelOffset(
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com.android.internal.R.styleable.ShapeDrawablePadding_right, 0),
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a.getDimensionPixelOffset(
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com.android.internal.R.styleable.ShapeDrawablePadding_bottom, 0));
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a.recycle();
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return true;
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}
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return false;
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}
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@Override
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public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
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throws XmlPullParserException, IOException {
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super.inflate(r, parser, attrs);
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TypedArray a = r.obtainAttributes(attrs, com.android.internal.R.styleable.ShapeDrawable);
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int color = mShapeState.mPaint.getColor();
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color = a.getColor(com.android.internal.R.styleable.ShapeDrawable_color, color);
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mShapeState.mPaint.setColor(color);
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boolean dither = a.getBoolean(com.android.internal.R.styleable.ShapeDrawable_dither, false);
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mShapeState.mPaint.setDither(dither);
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setIntrinsicWidth((int)
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a.getDimension(com.android.internal.R.styleable.ShapeDrawable_width, 0f));
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setIntrinsicHeight((int)
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a.getDimension(com.android.internal.R.styleable.ShapeDrawable_height, 0f));
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a.recycle();
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int type;
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final int outerDepth = parser.getDepth();
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while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
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&& (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
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if (type != XmlPullParser.START_TAG) {
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continue;
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}
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final String name = parser.getName();
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// call our subclass
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if (!inflateTag(name, r, parser, attrs)) {
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android.util.Log.w("drawable", "Unknown element: " + name +
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" for ShapeDrawable " + this);
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}
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}
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}
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private void updateShape() {
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if (mShapeState.mShape != null) {
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final Rect r = getBounds();
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final int w = r.width();
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final int h = r.height();
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mShapeState.mShape.resize(w, h);
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if (mShapeState.mShaderFactory != null) {
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mShapeState.mPaint.setShader(mShapeState.mShaderFactory.resize(w, h));
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}
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}
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invalidateSelf();
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}
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@Override
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public ConstantState getConstantState() {
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mShapeState.mChangingConfigurations = getChangingConfigurations();
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return mShapeState;
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}
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@Override
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public Drawable mutate() {
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if (!mMutated && super.mutate() == this) {
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if (mShapeState.mPaint != null) {
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mShapeState.mPaint = new Paint(mShapeState.mPaint);
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} else {
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mShapeState.mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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}
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if (mShapeState.mPadding != null) {
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mShapeState.mPadding = new Rect(mShapeState.mPadding);
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} else {
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mShapeState.mPadding = new Rect();
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}
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try {
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mShapeState.mShape = mShapeState.mShape.clone();
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} catch (CloneNotSupportedException e) {
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return null;
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}
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mMutated = true;
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}
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return this;
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}
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/**
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* Defines the intrinsic properties of this ShapeDrawable's Shape.
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*/
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final static class ShapeState extends ConstantState {
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int mChangingConfigurations;
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Paint mPaint;
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Shape mShape;
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Rect mPadding;
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int mIntrinsicWidth;
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int mIntrinsicHeight;
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int mAlpha = 255;
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ShaderFactory mShaderFactory;
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ShapeState(ShapeState orig) {
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if (orig != null) {
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mPaint = orig.mPaint;
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mShape = orig.mShape;
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mPadding = orig.mPadding;
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mIntrinsicWidth = orig.mIntrinsicWidth;
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mIntrinsicHeight = orig.mIntrinsicHeight;
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mAlpha = orig.mAlpha;
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mShaderFactory = orig.mShaderFactory;
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} else {
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mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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}
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}
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@Override
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public Drawable newDrawable() {
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return new ShapeDrawable(this);
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}
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@Override
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public Drawable newDrawable(Resources res) {
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return new ShapeDrawable(this);
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}
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@Override
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public int getChangingConfigurations() {
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return mChangingConfigurations;
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}
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}
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/**
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* Base class defines a factory object that is called each time the drawable
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* is resized (has a new width or height). Its resize() method returns a
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* corresponding shader, or null.
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* Implement this class if you'd like your ShapeDrawable to use a special
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* {@link android.graphics.Shader}, such as a
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* {@link android.graphics.LinearGradient}.
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*
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*/
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public static abstract class ShaderFactory {
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/**
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* Returns the Shader to be drawn when a Drawable is drawn.
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* The dimensions of the Drawable are passed because they may be needed
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* to adjust how the Shader is configured for drawing.
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* This is called by ShapeDrawable.setShape().
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*
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* @param width the width of the Drawable being drawn
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* @param height the heigh of the Drawable being drawn
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* @return the Shader to be drawn
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*/
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public abstract Shader resize(int width, int height);
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}
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// other subclass could wack the Shader's localmatrix based on the
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// resize params (e.g. scaletofit, etc.). This could be used to scale
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// a bitmap to fill the bounds without needing any other special casing.
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}
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