1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
* Copyright (c) 2008, 2009, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ScrollbarThemeChromiumLinux.h"
#include "PlatformContextSkia.h"
#include "PlatformMouseEvent.h"
#include "RenderTheme.h"
#include "RenderThemeChromiumLinux.h"
#include "Scrollbar.h"
#include "TransformationMatrix.h"
namespace WebCore {
ScrollbarTheme* ScrollbarTheme::nativeTheme()
{
static ScrollbarThemeChromiumLinux theme;
return &theme;
}
int ScrollbarThemeChromiumLinux::scrollbarThickness(ScrollbarControlSize controlSize)
{
return 15;
}
static void drawVertLine(SkCanvas* canvas, int x, int y1, int y2, const SkPaint& paint)
{
SkIRect skrect;
skrect.set(x, y1, x + 1, y2 + 1);
canvas->drawIRect(skrect, paint);
}
static void drawHorizLine(SkCanvas* canvas, int x1, int x2, int y, const SkPaint& paint)
{
SkIRect skrect;
skrect.set(x1, y, x2 + 1, y + 1);
canvas->drawIRect(skrect, paint);
}
static void drawBox(SkCanvas* canvas, const IntRect& rect, const SkPaint& paint)
{
const int right = rect.x() + rect.width() - 1;
const int bottom = rect.y() + rect.height() - 1;
drawHorizLine(canvas, rect.x(), right, rect.y(), paint);
drawVertLine(canvas, right, rect.y(), bottom, paint);
drawHorizLine(canvas, rect.x(), right, bottom, paint);
drawVertLine(canvas, rect.x(), rect.y(), bottom, paint);
}
static SkScalar clamp(SkScalar value, SkScalar min, SkScalar max)
{
return std::min(std::max(value, min), max);
}
static SkColor saturateAndBrighten(SkScalar* hsv,
SkScalar saturateAmount,
SkScalar brightenAmount)
{
SkScalar color[3];
color[0] = hsv[0];
color[1] = clamp(hsv[1] + saturateAmount, 0.0, 1.0);
color[2] = clamp(hsv[2] + brightenAmount, 0.0, 1.0);
return SkHSVToColor(color);
}
static SkColor outlineColor(SkScalar* hsv1, SkScalar* hsv2)
{
// GTK Theme engines have way too much control over the layout of
// the scrollbar. We might be able to more closely approximate its
// look-and-feel, if we sent whole images instead of just colors
// from the browser to the renderer. But even then, some themes
// would just break.
//
// So, instead, we don't even try to 100% replicate the look of
// the native scrollbar. We render our own version, but we make
// sure to pick colors that blend in nicely with the system GTK
// theme. In most cases, we can just sample a couple of pixels
// from the system scrollbar and use those colors to draw our
// scrollbar.
//
// This works fine for the track color and the overall thumb
// color. But it fails spectacularly for the outline color used
// around the thumb piece. Not all themes have a clearly defined
// outline. For some of them it is partially transparent, and for
// others the thickness is very unpredictable.
//
// So, instead of trying to approximate the system theme, we
// instead try to compute a reasonable looking choice based on the
// known color of the track and the thumb piece. This is difficult
// when trying to deal both with high- and low-contrast themes,
// and both with positive and inverted themes.
//
// The following code has been tested to look OK with all of the
// default GTK themes.
SkScalar minDiff = clamp((hsv1[1] + hsv2[1]) * 1.2, 0.2, 0.5);
SkScalar diff = clamp(fabs(hsv1[2] - hsv2[2]) / 2, minDiff, 0.5);
if (hsv1[2] + hsv2[2] > 1.0)
diff = -diff;
return saturateAndBrighten(hsv2, -0.2, diff);
}
IntRect ScrollbarThemeChromium::trackRect(Scrollbar* scrollbar, bool)
{
IntSize bs = buttonSize(scrollbar);
int thickness = scrollbarThickness(scrollbar->controlSize());
if (scrollbar->orientation() == HorizontalScrollbar)
return IntRect(scrollbar->x() + bs.width(), scrollbar->y(), scrollbar->width(), thickness);
return IntRect(scrollbar->x(), scrollbar->y() + bs.height(), thickness, scrollbar->height());
}
void ScrollbarThemeChromiumLinux::paintTrackPiece(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart partType)
{
SkCanvas* const canvas = gc->platformContext()->canvas();
SkPaint paint;
SkIRect skrect;
skrect.set(rect.x(), rect.y(), rect.x() + rect.width(), rect.y() + rect.height());
SkScalar track_hsv[3];
SkColorToHSV(RenderThemeChromiumLinux::trackColor(), track_hsv);
paint.setColor(saturateAndBrighten(track_hsv, 0, 0));
canvas->drawIRect(skrect, paint);
SkScalar thumb_hsv[3];
SkColorToHSV(RenderThemeChromiumLinux::thumbInactiveColor(),
thumb_hsv);
paint.setColor(outlineColor(track_hsv, thumb_hsv));
drawBox(canvas, rect, paint);
}
void ScrollbarThemeChromiumLinux::paintButton(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect, ScrollbarPart part)
{
// We don't use buttons
}
void ScrollbarThemeChromiumLinux::paintThumb(GraphicsContext* gc, Scrollbar* scrollbar, const IntRect& rect)
{
const bool hovered = scrollbar->hoveredPart() == ThumbPart;
const int midx = rect.x() + rect.width() / 2;
const int midy = rect.y() + rect.height() / 2;
const bool vertical = scrollbar->orientation() == VerticalScrollbar;
SkCanvas* const canvas = gc->platformContext()->canvas();
SkScalar thumb[3];
SkColorToHSV(hovered
? RenderThemeChromiumLinux::thumbActiveColor()
: RenderThemeChromiumLinux::thumbInactiveColor(),
thumb);
SkPaint paint;
paint.setColor(saturateAndBrighten(thumb, 0, 0.02));
SkIRect skrect;
if (vertical)
skrect.set(rect.x(), rect.y(), midx + 1, rect.y() + rect.height());
else
skrect.set(rect.x(), rect.y(), rect.x() + rect.width(), midy + 1);
canvas->drawIRect(skrect, paint);
paint.setColor(saturateAndBrighten(thumb, 0, -0.02));
if (vertical)
skrect.set(midx + 1, rect.y(), rect.x() + rect.width(), rect.y() + rect.height());
else
skrect.set(rect.x(), midy + 1, rect.x() + rect.width(), rect.y() + rect.height());
canvas->drawIRect(skrect, paint);
SkScalar track[3];
SkColorToHSV(RenderThemeChromiumLinux::trackColor(), track);
paint.setColor(outlineColor(track, thumb));
drawBox(canvas, rect, paint);
if (rect.height() > 10 && rect.width() > 10) {
const int grippyHalfWidth = 2;
const int interGrippyOffset = 3;
if (vertical) {
drawHorizLine(canvas, midx - grippyHalfWidth, midx + grippyHalfWidth, midy - interGrippyOffset, paint);
drawHorizLine(canvas, midx - grippyHalfWidth, midx + grippyHalfWidth, midy, paint);
drawHorizLine(canvas, midx - grippyHalfWidth, midx + grippyHalfWidth, midy + interGrippyOffset, paint);
} else {
drawVertLine(canvas, midx - interGrippyOffset, midy - grippyHalfWidth, midy + grippyHalfWidth, paint);
drawVertLine(canvas, midx, midy - grippyHalfWidth, midy + grippyHalfWidth, paint);
drawVertLine(canvas, midx + interGrippyOffset, midy - grippyHalfWidth, midy + grippyHalfWidth, paint);
}
}
}
bool ScrollbarThemeChromiumLinux::shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent& evt)
{
return (evt.shiftKey() && evt.button() == LeftButton) || (evt.button() == MiddleButton);
}
IntSize ScrollbarThemeChromiumLinux::buttonSize(Scrollbar* scrollbar)
{
// On Linux, we don't use buttons
return IntSize(0, 0);
}
int ScrollbarThemeChromiumLinux::minimumThumbLength(Scrollbar* scrollbar)
{
// This matches Firefox on Linux.
return 2 * scrollbarThickness(scrollbar->controlSize());
}
} // namespace WebCore
|
