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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
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2017/03/17 23:52:44
2017
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2017/03/18 00:16:51
Done.
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2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.chrome.browser.widget; | |
6 | |
7 import android.content.Context; | |
8 import android.graphics.Canvas; | |
9 import android.graphics.Color; | |
10 import android.graphics.Paint; | |
11 import android.util.AttributeSet; | |
12 import android.widget.ScrollView; | |
13 | |
14 import org.chromium.base.ApiCompatibilityUtils; | |
15 import org.chromium.chrome.R; | |
16 | |
17 /** | |
18 * An extension of the ScrollView that supports edge boundaries coming in. | |
19 */ | |
20 public class FadingEdgeScrollView extends ScrollView { | |
21 public static final int POSITION_TOP = 0; | |
Ted C
2017/03/17 23:52:44
do these need to be public?
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Done.
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22 public static final int POSITION_BOTTOM = 1; | |
23 | |
24 private final Paint mSeparatorPaint = new Paint(); | |
25 private final int mSeparatorColor; | |
26 private final int mSeparatorHeight; | |
27 | |
28 private boolean mDrawTopEdge = true; | |
29 private boolean mDrawBottomEdge = true; | |
30 | |
31 public FadingEdgeScrollView(Context context, AttributeSet attrs) { | |
32 super(context, attrs); | |
33 | |
34 mSeparatorColor = | |
35 ApiCompatibilityUtils.getColor(getResources(), R.color.toolbar_s hadow_color); | |
36 mSeparatorHeight = getResources().getDimensionPixelSize(R.dimen.separato r_height); | |
37 } | |
38 | |
39 @Override | |
40 protected void dispatchDraw(Canvas canvas) { | |
41 super.dispatchDraw(canvas); | |
42 setVerticalFadingEdgeEnabled(true); | |
43 float topEdgeStrength = getTopFadingEdgeStrength(); | |
44 float bottomEdgeStrength = getBottomFadingEdgeStrength(); | |
45 setVerticalFadingEdgeEnabled(false); | |
46 | |
47 if (mDrawTopEdge) drawBoundaryLine(canvas, POSITION_TOP, topEdgeStrength ); | |
48 if (mDrawBottomEdge) drawBoundaryLine(canvas, POSITION_BOTTOM, bottomEdg eStrength); | |
49 } | |
50 | |
51 /** | |
52 * Sets which edge should be drawn. | |
53 * @param drawTopEdge Whether to draw the edge on the top part of the vie w. | |
54 * @param drawBottomEdge Whether to draw the edge on the bottom part of the view. | |
55 */ | |
56 public void setEdgeVisibility(boolean drawTopEdge, boolean drawBottomEdge) { | |
57 mDrawTopEdge = drawTopEdge; | |
58 mDrawBottomEdge = drawBottomEdge; | |
Ted C
2017/03/17 23:52:44
should we call invalidate here if the values have
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2017/03/18 00:16:51
Done.
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59 } | |
60 | |
61 /** | |
62 * Draws a line at the top or bottom of the view. This should be called from dispatchDraw() so | |
63 * it gets drawn on top of the View's children. | |
64 * | |
65 * @param canvas The canvas on which to draw. | |
66 * @param position Where to draw the line: either POSITION_TOP or POSITI ON_BOTTOM. | |
67 * @param edgeStrength A value between 0 and 1 indicating the relative size of the line. 0 | |
68 * means no line at all. 1 means a fully opaque line. | |
69 */ | |
70 private void drawBoundaryLine(Canvas canvas, int position, float edgeStrengt h) { | |
71 if (edgeStrength <= 0.0f) return; | |
72 | |
73 int adjustedA = (int) ((mSeparatorColor >> 24) * edgeStrength); | |
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2017/03/17 23:52:44
Color.alpha(...), Color.red(...), Color.blue(...),
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Done.
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74 int adjustedR = (int) ((mSeparatorColor >> 16 & 0x000000ff) * edgeStreng th); | |
75 int adjustedG = (int) ((mSeparatorColor >> 8 & 0x000000ff) * edgeStrengt h); | |
76 int adjustedB = (int) ((mSeparatorColor & 0x000000ff) * edgeStrength); | |
77 mSeparatorPaint.setColor(Color.argb(adjustedA, adjustedR, adjustedG, adj ustedB)); | |
78 | |
79 int left = getScrollX(); | |
80 int right = left + getRight(); | |
81 | |
82 if (position == POSITION_BOTTOM) { | |
83 int bottom = getScrollY() + getBottom() - getTop(); | |
84 canvas.drawRect(left, bottom - mSeparatorHeight, right, bottom, mSep aratorPaint); | |
85 } else if (position == POSITION_TOP) { | |
86 int top = getScrollY(); | |
87 canvas.drawRect(left, top, right, top + mSeparatorHeight, mSeparator Paint); | |
88 } | |
89 } | |
90 } | |
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