michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.toolbar;
michael@0: 
michael@0: import org.mozilla.gecko.R;
michael@0: 
michael@0: import android.content.Context;
michael@0: import android.graphics.Canvas;
michael@0: import android.graphics.LinearGradient;
michael@0: import android.graphics.Paint;
michael@0: import android.graphics.Path;
michael@0: import android.graphics.Shader;
michael@0: import android.graphics.drawable.Drawable;
michael@0: import android.graphics.drawable.StateListDrawable;
michael@0: import android.util.AttributeSet;
michael@0: 
michael@0: public class BackButton extends ShapedButton { 
michael@0:     private Path mPath;
michael@0:     private Path mBorderPath;
michael@0:     private Paint mBorderPaint;
michael@0:     private Paint mBorderPrivatePaint;
michael@0: 
michael@0:     public BackButton(Context context, AttributeSet attrs) {
michael@0:         super(context, attrs);
michael@0: 
michael@0:         // Paint to draw the border.
michael@0:         mBorderPaint = new Paint();
michael@0:         mBorderPaint.setAntiAlias(true);
michael@0:         mBorderPaint.setColor(0xFF000000);
michael@0:         mBorderPaint.setStyle(Paint.Style.STROKE);
michael@0: 
michael@0:         mBorderPrivatePaint = new Paint(mBorderPaint);
michael@0: 
michael@0:         // Path is masked.
michael@0:         mPath = new Path();
michael@0:         mBorderPath = new Path();
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {
michael@0:         super.onSizeChanged(width, height, oldWidth, oldHeight);
michael@0: 
michael@0:         mPath.reset();
michael@0:         mPath.addCircle(width/2, height/2, width/2, Path.Direction.CW);
michael@0: 
michael@0:         float borderWidth = getContext().getResources().getDimension(R.dimen.nav_button_border_width);
michael@0:         mBorderPaint.setStrokeWidth(borderWidth);
michael@0:         mBorderPrivatePaint.setStrokeWidth(borderWidth);
michael@0: 
michael@0:         mBorderPath.reset();
michael@0:         mBorderPath.addCircle(width/2, height/2, (width/2) - borderWidth, Path.Direction.CW);
michael@0: 
michael@0:         mBorderPaint.setShader(new LinearGradient(0, 0, 
michael@0:                                                   0, height, 
michael@0:                                                   0xFFB5BBC1, 0xFFFAFBFC,
michael@0:                                                   Shader.TileMode.CLAMP));
michael@0: 
michael@0:         mBorderPrivatePaint.setShader(new LinearGradient(0, 0, 
michael@0:                                                          0, height, 
michael@0:                                                          0xFF040607, 0xFF0B0D0E,
michael@0:                                                          Shader.TileMode.CLAMP));
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void draw(Canvas canvas) {
michael@0:         mCanvasDelegate.draw(canvas, mPath, getWidth(), getHeight());
michael@0: 
michael@0:         // Draw the border on top.
michael@0:         canvas.drawPath(mBorderPath, isPrivateMode() ? mBorderPrivatePaint : mBorderPaint);
michael@0:     }
michael@0: 
michael@0:     // The drawable is constructed as per @drawable/url_bar_nav_button.
michael@0:     @Override
michael@0:     public void onLightweightThemeChanged() {
michael@0:         final Drawable drawable = mTheme.getDrawable(this);
michael@0:         if (drawable == null)
michael@0:             return;
michael@0: 
michael@0:         final StateListDrawable stateList = new StateListDrawable();
michael@0:         stateList.addState(PRIVATE_PRESSED_STATE_SET, getColorDrawable(R.color.highlight_nav_pb));
michael@0:         stateList.addState(PRESSED_ENABLED_STATE_SET, getColorDrawable(R.color.highlight_nav));
michael@0:         stateList.addState(PRIVATE_FOCUSED_STATE_SET, getColorDrawable(R.color.highlight_nav_focused_pb));
michael@0:         stateList.addState(FOCUSED_STATE_SET, getColorDrawable(R.color.highlight_nav_focused));
michael@0:         stateList.addState(PRIVATE_STATE_SET, getColorDrawable(R.color.background_private));
michael@0:         stateList.addState(EMPTY_STATE_SET, drawable);
michael@0: 
michael@0:         setBackgroundDrawable(stateList);
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onLightweightThemeReset() {
michael@0:         setBackgroundResource(R.drawable.url_bar_nav_button);
michael@0:     }
michael@0: }