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
|
// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_GRADIENT_WITH_STOPS_H
#define SEEN_GRADIENT_WITH_STOPS_H
#include <gtkmm/widget.h>
#include <gdkmm/color.h>
#include "ui/svg-renderer.h"
#include "helper/auto-connection.h"
class SPGradient;
namespace Inkscape {
namespace UI {
namespace Widget {
class GradientWithStops : public Gtk::DrawingArea {
public:
GradientWithStops();
// gradient to draw or nullptr
void set_gradient(SPGradient* gradient);
// set selected stop handle (or pass -1 to deselect)
void set_focused_stop(int index);
// stop has been selected
sigc::signal<void (size_t)>& signal_stop_selected() {
return _signal_stop_selected;
}
// request to change stop's offset
sigc::signal<void (size_t, double)>& signal_stop_offset_changed() {
return _signal_stop_offset_changed;
}
sigc::signal<void (double)>& signal_add_stop_at() {
return _signal_add_stop_at;
}
sigc::signal<void (size_t)>& signal_delete_stop() {
return _signal_delete_stop;
}
private:
void get_preferred_width_vfunc(int& minimum_width, int& natural_width) const override;
void get_preferred_height_vfunc(int& minimum_height, int& natural_height) const override;
bool on_draw(const Cairo::RefPtr<Cairo::Context>& cr) override;
void on_style_updated() override;
bool on_button_press_event(GdkEventButton* event) override;
bool on_button_release_event(GdkEventButton* event) override;
bool on_motion_notify_event(GdkEventMotion* event) override;
bool on_key_press_event(GdkEventKey* key_event) override;
bool on_focus_in_event(GdkEventFocus* event) override;
bool on_focus_out_event(GdkEventFocus* event) override;
bool on_focus(Gtk::DirectionType direction) override;
void size_request(GtkRequisition* requisition) const;
void modified();
// repaint widget
void update();
// index of gradient stop handle under (x, y) or -1
int find_stop_at(double x, double y) const;
// request stop move
void move_stop(int stop_index, double offset_shift);
// layout of gradient image/editor
struct layout_t {
double x, y, width, height;
};
layout_t get_layout() const;
// position of single gradient stop handle
struct stop_pos_t {
double left, tip, right, top, bottom;
};
stop_pos_t get_stop_position(size_t index, const layout_t& layout) const;
struct limits_t {
double min_offset, max_offset, offset;
};
limits_t get_stop_limits(int index) const;
GdkCursor* get_cursor(double x, double y) const;
SPGradient* _gradient = nullptr;
struct stop_t {
double offset;
SPColor color;
double opacity;
};
std::vector<stop_t> _stops;
// handle stop SVG template
svg_renderer _template;
// selected handle indicator
svg_renderer _tip_template;
auto_connection _release;
auto_connection _modified;
Gdk::RGBA _background_color;
sigc::signal<void (size_t)> _signal_stop_selected;
sigc::signal<void (size_t, double)> _signal_stop_offset_changed;
sigc::signal<void (double)> _signal_add_stop_at;
sigc::signal<void (size_t)> _signal_delete_stop;
bool _dragging = false;
// index of handle stop that user clicked; may be out of range
int _focused_stop = -1;
double _pointer_x = 0;
double _stop_offset = 0;
Glib::RefPtr<Gdk::Cursor> _cursor_mouseover;
Glib::RefPtr<Gdk::Cursor> _cursor_dragging;
Glib::RefPtr<Gdk::Cursor> _cursor_insert;
// TODO: customize this amount or read prefs
double _stop_move_increment = 0.01;
};
} // namespace Widget
} // namespace UI
} // namespace Inkscape
#endif
|
