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6a7eb118 RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2009 Richard Kettlewell | |
4 | * | |
5 | * This program is free software: you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, either version 3 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | /** @file disobedience/multidrag.c | |
19 | * @brief Drag multiple rows of a GtkTreeView | |
30b358a3 RK |
20 | * |
21 | * Normally when you start a drag, GtkTreeView sets the selection to just row | |
22 | * you dragged from (because it can't cope with dragging more than one row at a | |
23 | * time). | |
24 | * | |
25 | * Disobedience needs more. To implement this it intercepts button-press-event | |
26 | * and button-release event and for clicks that might be the start of drags, | |
27 | * suppresses changes to the selection. A consequence of this is that it needs | |
28 | * to intercept button-release-event too, to restore the effect of the click, | |
29 | * if it turns out not to be drag after all. | |
30 | * | |
31 | * The location of the initial click is stored in object data called @c | |
32 | * multidrag-where. | |
33 | * | |
34 | * Inspired by similar code in <a | |
35 | * href="http://code.google.com/p/quodlibet/">Quodlibet</a> (another software | |
36 | * jukebox, albeit as far as I can see a single-user one). | |
6a7eb118 | 37 | */ |
3ae36d41 RK |
38 | #include <config.h> |
39 | #include <glib.h> | |
40 | #include <gtk/gtk.h> | |
41 | ||
42 | #include "multidrag.h" | |
6a7eb118 RK |
43 | |
44 | static gboolean multidrag_selection_block(GtkTreeSelection attribute((unused)) *selection, | |
45 | GtkTreeModel attribute((unused)) *model, | |
46 | GtkTreePath attribute((unused)) *path, | |
47 | gboolean attribute((unused)) path_currently_selected, | |
48 | gpointer data) { | |
30b358a3 | 49 | return *(const gboolean *)data; |
6a7eb118 RK |
50 | } |
51 | ||
52 | static void block_selection(GtkWidget *w, gboolean block, | |
53 | int x, int y) { | |
30b358a3 | 54 | static const gboolean which[] = { FALSE, TRUE }; |
6a7eb118 RK |
55 | GtkTreeSelection *s = gtk_tree_view_get_selection(GTK_TREE_VIEW(w)); |
56 | gtk_tree_selection_set_select_function(s, | |
57 | multidrag_selection_block, | |
30b358a3 | 58 | (gboolean *)&which[!!block], |
6a7eb118 RK |
59 | NULL); |
60 | // Remember the pointer location | |
61 | int *where = g_object_get_data(G_OBJECT(w), "multidrag-where"); | |
62 | if(!where) { | |
63 | where = g_malloc(2 * sizeof (int)); | |
64 | g_object_set_data(G_OBJECT(w), "multidrag-where", where); | |
65 | } | |
66 | where[0] = x; | |
67 | where[1] = y; | |
30b358a3 | 68 | // TODO release 'where' when object is destroyed |
6a7eb118 RK |
69 | } |
70 | ||
71 | static gboolean multidrag_button_press_event(GtkWidget *w, | |
72 | GdkEventButton *event, | |
73 | gpointer attribute((unused)) user_data) { | |
74 | /* By default we assume that anything this button press does should | |
75 | * act as normal */ | |
76 | block_selection(w, TRUE, -1, -1); | |
77 | /* We are only interested in left-button behavior */ | |
78 | if(event->button != 1) | |
79 | return FALSE; | |
80 | /* We are only interested in unmodified clicks (not SHIFT etc) */ | |
81 | if(event->state & GDK_MODIFIER_MASK) | |
82 | return FALSE; | |
83 | /* We are only interested if a well-defined path is clicked */ | |
84 | GtkTreePath *path; | |
85 | if(!gtk_tree_view_get_path_at_pos(GTK_TREE_VIEW(w), | |
86 | event->x, event->y, | |
87 | &path, | |
88 | NULL, | |
89 | NULL, NULL)) | |
90 | return FALSE; | |
91 | //gtk_widget_grab_focus(w); // TODO why?? | |
92 | /* We are only interested if a selected row is clicked */ | |
93 | GtkTreeSelection *s = gtk_tree_view_get_selection(GTK_TREE_VIEW(w)); | |
94 | if(!gtk_tree_selection_path_is_selected(s, path)) | |
95 | return FALSE; | |
96 | /* We block subsequent selection changes and remember where the | |
97 | * click was */ | |
98 | block_selection(w, FALSE, event->x, event->y); | |
99 | return FALSE; /* propagate */ | |
100 | } | |
101 | ||
102 | static gboolean multidrag_button_release_event(GtkWidget *w, | |
103 | GdkEventButton *event, | |
104 | gpointer attribute((unused)) user_data) { | |
105 | int *where = g_object_get_data(G_OBJECT(w), "multidrag-where"); | |
106 | ||
30b358a3 RK |
107 | /* Did button-press-event do anything? We just check the outcome rather than |
108 | * going through all the conditions it tests. */ | |
6a7eb118 RK |
109 | if(where && where[0] != -1) { |
110 | // Remember where the down-click was | |
111 | const int x = where[0], y = where[1]; | |
112 | // Re-allow selections | |
113 | block_selection(w, TRUE, -1, -1); | |
114 | if(x == event->x && y == event->y) { | |
115 | // If the up-click is at the same location as the down-click, | |
116 | // it's not a drag. | |
117 | GtkTreePath *path; | |
118 | GtkTreeViewColumn *col; | |
119 | if(gtk_tree_view_get_path_at_pos(GTK_TREE_VIEW(w), | |
120 | event->x, event->y, | |
121 | &path, | |
122 | &col, | |
123 | NULL, NULL)) { | |
124 | gtk_tree_view_set_cursor(GTK_TREE_VIEW(w), path, col, FALSE); | |
125 | } | |
126 | } | |
127 | } | |
128 | return FALSE; /* propagate */ | |
129 | } | |
130 | ||
30b358a3 RK |
131 | /** @brief Allow multi-row drag for @p w |
132 | * @param w A GtkTreeView widget | |
133 | * | |
134 | * Suppresses the restriction of selections when a drag is started. | |
135 | */ | |
6a7eb118 RK |
136 | void make_treeview_multidrag(GtkWidget *w) { |
137 | g_signal_connect(w, "button-press-event", | |
138 | G_CALLBACK(multidrag_button_press_event), NULL); | |
139 | g_signal_connect(w, "button-release-event", | |
140 | G_CALLBACK(multidrag_button_release_event), NULL); | |
141 | } | |
142 | ||
143 | /* | |
144 | Local Variables: | |
145 | c-basic-offset:2 | |
146 | comment-column:40 | |
147 | fill-column:79 | |
148 | indent-tabs-mode:nil | |
149 | End: | |
150 | */ |