The Tor Browser: mobile/android/base/toolbar/BackButton.java@fc2d59ddac77

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 package org.mozilla.gecko.toolbar;

     7 import org.mozilla.gecko.R;

     9 import android.content.Context;

    10 import android.graphics.Canvas;

    11 import android.graphics.LinearGradient;

    12 import android.graphics.Paint;

    13 import android.graphics.Path;

    14 import android.graphics.Shader;

    15 import android.graphics.drawable.Drawable;

    16 import android.graphics.drawable.StateListDrawable;

    17 import android.util.AttributeSet;

    19 public class BackButton extends ShapedButton {

    20     private Path mPath;

    21     private Path mBorderPath;

    22     private Paint mBorderPaint;

    23     private Paint mBorderPrivatePaint;

    25     public BackButton(Context context, AttributeSet attrs) {

    26         super(context, attrs);

    28         // Paint to draw the border.

    29         mBorderPaint = new Paint();

    30         mBorderPaint.setAntiAlias(true);

    31         mBorderPaint.setColor(0xFF000000);

    32         mBorderPaint.setStyle(Paint.Style.STROKE);

    34         mBorderPrivatePaint = new Paint(mBorderPaint);

    36         // Path is masked.

    37         mPath = new Path();

    38         mBorderPath = new Path();

    39     }

    41     @Override

    42     protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {

    43         super.onSizeChanged(width, height, oldWidth, oldHeight);

    45         mPath.reset();

    46         mPath.addCircle(width/2, height/2, width/2, Path.Direction.CW);

    48         float borderWidth = getContext().getResources().getDimension(R.dimen.nav_button_border_width);

    49         mBorderPaint.setStrokeWidth(borderWidth);

    50         mBorderPrivatePaint.setStrokeWidth(borderWidth);

    52         mBorderPath.reset();

    53         mBorderPath.addCircle(width/2, height/2, (width/2) - borderWidth, Path.Direction.CW);

    55         mBorderPaint.setShader(new LinearGradient(0, 0,

    56                                                   0, height,

    57                                                   0xFFB5BBC1, 0xFFFAFBFC,

    58                                                   Shader.TileMode.CLAMP));

    60         mBorderPrivatePaint.setShader(new LinearGradient(0, 0,

    61                                                          0, height,

    62                                                          0xFF040607, 0xFF0B0D0E,

    63                                                          Shader.TileMode.CLAMP));

    64     }

    66     @Override

    67     public void draw(Canvas canvas) {

    68         mCanvasDelegate.draw(canvas, mPath, getWidth(), getHeight());

    70         // Draw the border on top.

    71         canvas.drawPath(mBorderPath, isPrivateMode() ? mBorderPrivatePaint : mBorderPaint);

    72     }

    74     // The drawable is constructed as per @drawable/url_bar_nav_button.

    75     @Override

    76     public void onLightweightThemeChanged() {

    77         final Drawable drawable = mTheme.getDrawable(this);

    78         if (drawable == null)

    79             return;

    81         final StateListDrawable stateList = new StateListDrawable();

    82         stateList.addState(PRIVATE_PRESSED_STATE_SET, getColorDrawable(R.color.highlight_nav_pb));

    83         stateList.addState(PRESSED_ENABLED_STATE_SET, getColorDrawable(R.color.highlight_nav));

    84         stateList.addState(PRIVATE_FOCUSED_STATE_SET, getColorDrawable(R.color.highlight_nav_focused_pb));

    85         stateList.addState(FOCUSED_STATE_SET, getColorDrawable(R.color.highlight_nav_focused));

    86         stateList.addState(PRIVATE_STATE_SET, getColorDrawable(R.color.background_private));

    87         stateList.addState(EMPTY_STATE_SET, drawable);

    89         setBackgroundDrawable(stateList);

    90     }

    92     @Override

    93     public void onLightweightThemeReset() {

    94         setBackgroundResource(R.drawable.url_bar_nav_button);

    95     }

    96 }

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