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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
|
#include <LibGUI/GScrollBar.h>
#include <LibGUI/GStyle.h>
#include <SharedGraphics/CharacterBitmap.h>
#include <SharedGraphics/GraphicsBitmap.h>
#include <SharedGraphics/Painter.h>
//#define GUTTER_DOES_PAGEUP_PAGEDOWN
static const char* s_up_arrow_bitmap_data = {
" "
" # "
" ### "
" ##### "
" ####### "
" ### "
" ### "
" ### "
" "
};
static const char* s_down_arrow_bitmap_data = {
" "
" ### "
" ### "
" ### "
" ####### "
" ##### "
" ### "
" # "
" "
};
static const char* s_left_arrow_bitmap_data = {
" "
" # "
" ## "
" ###### "
" ####### "
" ###### "
" ## "
" # "
" "
};
static const char* s_right_arrow_bitmap_data = {
" "
" # "
" ## "
" ###### "
" ####### "
" ###### "
" ## "
" # "
" "
};
static CharacterBitmap* s_up_arrow_bitmap;
static CharacterBitmap* s_down_arrow_bitmap;
static CharacterBitmap* s_left_arrow_bitmap;
static CharacterBitmap* s_right_arrow_bitmap;
GScrollBar::GScrollBar(Orientation orientation, GWidget* parent)
: GWidget(parent)
, m_orientation(orientation)
{
if (!s_up_arrow_bitmap)
s_up_arrow_bitmap = &CharacterBitmap::create_from_ascii(s_up_arrow_bitmap_data, 9, 9).leak_ref();
if (!s_down_arrow_bitmap)
s_down_arrow_bitmap = &CharacterBitmap::create_from_ascii(s_down_arrow_bitmap_data, 9, 9).leak_ref();
if (!s_left_arrow_bitmap)
s_left_arrow_bitmap = &CharacterBitmap::create_from_ascii(s_left_arrow_bitmap_data, 9, 9).leak_ref();
if (!s_right_arrow_bitmap)
s_right_arrow_bitmap = &CharacterBitmap::create_from_ascii(s_right_arrow_bitmap_data, 9, 9).leak_ref();
if (m_orientation == Orientation::Vertical) {
set_preferred_size({ 15, 0 });
} else {
set_preferred_size({ 0, 15 });
}
}
GScrollBar::~GScrollBar()
{
}
void GScrollBar::set_range(int min, int max)
{
ASSERT(min <= max);
if (m_min == min && m_max == max)
return;
m_min = min;
m_max = max;
int old_value = m_value;
if (m_value < m_min)
m_value = m_min;
if (m_value > m_max)
m_value = m_max;
if (on_change && m_value != old_value)
on_change(m_value);
update();
}
void GScrollBar::set_value(int value)
{
if (value < m_min)
value = m_min;
if (value > m_max)
value = m_max;
if (value == m_value)
return;
m_value = value;
if (on_change)
on_change(value);
update();
}
Rect GScrollBar::up_button_rect() const
{
return { 0, 0, button_size(), button_size() };
}
Rect GScrollBar::down_button_rect() const
{
if (orientation() == Orientation::Vertical)
return { 0, height() - button_size(), button_size(), button_size() };
else
return { width() - button_size(), 0, button_size(), button_size() };
}
Rect GScrollBar::upper_gutter_rect() const
{
if (orientation() == Orientation::Vertical)
return { 0, button_size(), button_size(), scrubber_rect().top() - button_size() };
else
return { button_size(), 0, scrubber_rect().x() - button_size(), button_size() };
}
Rect GScrollBar::lower_gutter_rect() const
{
auto scrubber_rect = this->scrubber_rect();
if (orientation() == Orientation::Vertical)
return { 0, scrubber_rect.bottom() + 1, button_size(), height() - button_size() - scrubber_rect.bottom() - 1};
else
return { scrubber_rect.right() + 1, 0, width() - button_size() - scrubber_rect.right() - 1, button_size() };
}
int GScrollBar::scrubbable_range_in_pixels() const
{
if (orientation() == Orientation::Vertical)
return height() - button_size() * 3;
else
return width() - button_size() * 3;
}
bool GScrollBar::has_scrubber() const
{
return m_max != m_min;
}
Rect GScrollBar::scrubber_rect() const
{
if (!has_scrubber())
return { };
float x_or_y;
if (m_value == m_min)
x_or_y = button_size() - 1;
else if (m_value == m_max)
x_or_y = ((orientation() == Orientation::Vertical ? height() : width()) - (button_size() * 2)) + 1;
else {
float range_size = m_max - m_min;
float available = scrubbable_range_in_pixels();
float step = available / range_size;
x_or_y = (button_size() + (step * m_value));
}
if (orientation() == Orientation::Vertical)
return { 0, (int)x_or_y, button_size(), button_size() };
else
return { (int)x_or_y, 0, button_size(), button_size() };
}
void GScrollBar::paint_event(GPaintEvent& event)
{
Painter painter(*this);
painter.set_clip_rect(event.rect());
painter.fill_rect(rect(), Color(164, 164, 164));
GStyle::the().paint_button(painter, up_button_rect(), GButtonStyle::Normal, false);
painter.draw_bitmap(up_button_rect().location().translated(3, 3), orientation() == Orientation::Vertical ? *s_up_arrow_bitmap : *s_left_arrow_bitmap, has_scrubber() ? Color::Black : Color::MidGray);
GStyle::the().paint_button(painter, down_button_rect(), GButtonStyle::Normal, false);
painter.draw_bitmap(down_button_rect().location().translated(3, 3), orientation() == Orientation::Vertical ? *s_down_arrow_bitmap : *s_right_arrow_bitmap, has_scrubber() ? Color::Black : Color::MidGray);
if (has_scrubber())
GStyle::the().paint_button(painter, scrubber_rect(), GButtonStyle::Normal, false);
}
void GScrollBar::mousedown_event(GMouseEvent& event)
{
if (event.button() != GMouseButton::Left)
return;
if (up_button_rect().contains(event.position())) {
set_value(value() - m_step);
return;
}
if (down_button_rect().contains(event.position())) {
set_value(value() + m_step);
return;
}
#ifdef GUTTER_DOES_PAGEUP_PAGEDOWN
if (has_scrubber() && upper_gutter_rect().contains(event.position())) {
set_value(value() - m_big_step);
return;
}
if (has_scrubber() && lower_gutter_rect().contains(event.position())) {
set_value(value() + m_big_step);
return;
}
#endif
if (has_scrubber() && scrubber_rect().contains(event.position())) {
m_scrubbing = true;
m_scrub_start_value = value();
m_scrub_origin = event.position();
update();
return;
}
#ifndef GUTTER_DOES_PAGEUP_PAGEDOWN
if (has_scrubber()) {
float range_size = m_max - m_min;
float available = scrubbable_range_in_pixels();
float x = ::max(0, event.position().x() - button_size() - button_size() / 2);
float y = ::max(0, event.position().y() - button_size() - button_size() / 2);
float rel_x = x / available;
float rel_y = y / available;
if (orientation() == Orientation::Vertical)
set_value(m_min + rel_y * range_size);
else
set_value(m_min + rel_x * range_size);
m_scrubbing = true;
m_scrub_start_value = value();
m_scrub_origin = event.position();
}
#endif
}
void GScrollBar::mouseup_event(GMouseEvent& event)
{
if (event.button() != GMouseButton::Left)
return;
if (!m_scrubbing)
return;
m_scrubbing = false;
update();
}
void GScrollBar::mousemove_event(GMouseEvent& event)
{
if (!m_scrubbing)
return;
float delta = orientation() == Orientation::Vertical ? (event.y() - m_scrub_origin.y()) : (event.x() - m_scrub_origin.x());
float scrubbable_range = scrubbable_range_in_pixels();
float value_steps_per_scrubbed_pixel = (m_max - m_min) / scrubbable_range;
float new_value = m_scrub_start_value + (value_steps_per_scrubbed_pixel * delta);
set_value(new_value);
}
|
