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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
static char url_list_name[] = "text/uri-list";
static GtkTargetEntry url_list = {url_list_name, 0u, 0u};
static int dragging = 0;
static int drag_source_disabled = 0;
static int drag_x, drag_y;
static void
set_file_drag_source(GtkWidget *widget)
{
gtk_drag_source_set(widget, GDK_BUTTON1_MASK, &url_list, 1u,
GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK | GDK_ACTION_ASK);
}
static int
button_pressed(GtkWidget *widget, GdkEventButton *event, void *user)
{
(void) user;
if (event->button == 2u || (event->state & GDK_CONTROL_MASK)) {
if (event->button == 1u) {
gtk_drag_source_unset(widget);
drag_source_disabled = 1;
}
dragging = 1;
drag_x = (int)event->x_root;
drag_y = (int)event->y_root;
}
return dragging;
}
static int
button_released(GtkWidget *widget, GdkEventButton *event, void *user)
{
(void) event;
(void) user;
dragging = 0;
if (drag_source_disabled) {
set_file_drag_source(widget);
drag_source_disabled = 0;
}
return 0;
}
static int
pointer_moved(GtkWidget *widget, GdkEventMotion *event, void *user)
{
int x, y;
(void) event;
(void) user;
if (dragging) {
gdk_display_get_pointer(gtk_widget_get_display(widget), NULL, &x, &y, NULL);
scroll_by(drag_x - x, drag_y - y);
drag_x = x;
drag_y = y;
}
return dragging;
}
static void
drag_begin(GtkWidget *widget, GdkDragContext *context, void *user)
{
GdkPixbuf *image, *icon;
intmax_t height, width;
(void) widget;
(void) user;
image = get_original_image();
if (!image)
return;
width = gdk_pixbuf_get_width(image);
height = gdk_pixbuf_get_height(image);
if (width <= DRAG_ICON_SIZE && height <= DRAG_ICON_SIZE) {
gtk_drag_set_icon_pixbuf(context, image, 0, 0);
return;
}
if (width >= height) {
height = height * DRAG_ICON_SIZE / width;
height = MAX(1, height);
width = DRAG_ICON_SIZE;
} else {
width = width * DRAG_ICON_SIZE / height;
width = MAX(1, width);
height = DRAG_ICON_SIZE;
}
icon = gdk_pixbuf_scale_simple(image, (int)width, (int)height, GDK_INTERP_BILINEAR);
if (!icon)
return;
gtk_drag_set_icon_pixbuf(context, icon, 0, 0);
g_object_unref(icon);
}
static void
drag_data_get(GtkWidget *widget, GdkDragContext *context, GtkSelectionData *data,
unsigned int info, unsigned int time, void *user)
{
struct file *file = get_file();
GError *error = NULL;
char *uri;
(void) widget;
(void) context;
(void) info;
(void) time;
(void) user;
if (!file || !file->path)
return;
uri = g_filename_to_uri(file->path, NULL, &error);
if (!uri) {
weprintf("g_filename_to_uri: %s", error->message);
g_error_free(error);
return;
}
gtk_selection_data_set_uris(data, (char *[]){uri, NULL});
g_free(uri);
}
void
set_up_dragging(void)
{
set_file_drag_source(display_area);
g_signal_connect(display_area, "button-press-event", G_CALLBACK(&button_pressed), NULL);
g_signal_connect(display_area, "button-release-event", G_CALLBACK(&button_released), NULL);
g_signal_connect(display_area, "motion-notify-event", G_CALLBACK(&pointer_moved), NULL);
g_signal_connect(display_area, "drag-begin", G_CALLBACK(&drag_begin), NULL);
g_signal_connect(display_area, "drag-data-get", G_CALLBACK(&drag_data_get), NULL);
}
|
