1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /** @file
3 * Collection of shorthands to deal with GDK events.
4 */
5 /* Authors:
6 * Krzysztof Kosiński <tweenk.pl@gmail.com>
7 *
8 * Copyright (C) 2009 Authors
9 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
10 */
11
12 #include <cstring>
13 #include <gdk/gdk.h>
14 #include <gdk/gdkkeysyms.h>
15 #include <gdkmm/display.h>
16 #include "ui/tool/event-utils.h"
17
18 namespace Inkscape {
19 namespace UI {
20
21
shortcut_key(GdkEventKey const & event)22 guint shortcut_key(GdkEventKey const &event)
23 {
24 guint shortcut_key = 0;
25 gdk_keymap_translate_keyboard_state(
26 Gdk::Display::get_default()->get_keymap(),
27 event.hardware_keycode,
28 (GdkModifierType) event.state,
29 0 /*event->key.group*/,
30 &shortcut_key, nullptr, nullptr, nullptr);
31 return shortcut_key;
32 }
33
combine_key_events(guint keyval,gint mask)34 unsigned combine_key_events(guint keyval, gint mask)
35 {
36 GdkEvent *event_next;
37 gint i = 0;
38
39 event_next = gdk_event_get();
40 // while the next event is also a key notify with the same keyval and mask,
41 while (event_next && (event_next->type == GDK_KEY_PRESS || event_next->type == GDK_KEY_RELEASE)
42 && event_next->key.keyval == keyval
43 && (!mask || event_next->key.state & mask)) {
44 if (event_next->type == GDK_KEY_PRESS)
45 i ++;
46 // kill it
47 gdk_event_free(event_next);
48 // get next
49 event_next = gdk_event_get();
50 }
51 // otherwise, put it back onto the queue
52 if (event_next) gdk_event_put(event_next);
53
54 return i;
55 }
56
57 /** Returns the modifier state valid after this event. Use this when you process events
58 * that change the modifier state. Currently handles only Shift, Ctrl, Alt. */
state_after_event(GdkEvent * event)59 unsigned state_after_event(GdkEvent *event)
60 {
61 unsigned state = 0;
62 switch (event->type) {
63 case GDK_KEY_PRESS:
64 state = event->key.state;
65 switch(shortcut_key(event->key)) {
66 case GDK_KEY_Shift_L:
67 case GDK_KEY_Shift_R:
68 state |= GDK_SHIFT_MASK;
69 break;
70 case GDK_KEY_Control_L:
71 case GDK_KEY_Control_R:
72 state |= GDK_CONTROL_MASK;
73 break;
74 case GDK_KEY_Alt_L:
75 case GDK_KEY_Alt_R:
76 state |= GDK_MOD1_MASK;
77 break;
78 default: break;
79 }
80 break;
81 case GDK_KEY_RELEASE:
82 state = event->key.state;
83 switch(shortcut_key(event->key)) {
84 case GDK_KEY_Shift_L:
85 case GDK_KEY_Shift_R:
86 state &= ~GDK_SHIFT_MASK;
87 break;
88 case GDK_KEY_Control_L:
89 case GDK_KEY_Control_R:
90 state &= ~GDK_CONTROL_MASK;
91 break;
92 case GDK_KEY_Alt_L:
93 case GDK_KEY_Alt_R:
94 state &= ~GDK_MOD1_MASK;
95 break;
96 default: break;
97 }
98 break;
99 default: break;
100 }
101 return state;
102 }
103
104 } // namespace UI
105 } // namespace Inkscape
106
107 /*
108 Local Variables:
109 mode:c++
110 c-file-style:"stroustrup"
111 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
112 indent-tabs-mode:nil
113 fill-column:99
114 End:
115 */
116 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
117