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comparison examples/drag/main.c @ 199:55533146efdf

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Add drag example
author wycc@wycc-desktop
date Sat, 06 Dec 2008 15:40:23 +0800
parents
children 09ad4382aa41
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198:f9d507a3e1d9 199:55533146efdf
1 /*! \file
2 *
3 * svg2code_ex is an example that show programmers how to create a
4 * menu with MadButterfly.
5 *
6 */
7 #include <stdio.h>
8 #include <mb.h>
9 #include "menu.h"
10
11 typedef struct _engine engine_t;
12 struct _engine {
13 X_MB_runtime_t *rt;
14 redraw_man_t *rdman;
15 menu_t *menu;
16 int state;
17 co_aix orx,ory;
18 int start_x,start_y;
19 };
20 engine_t *engine_init()
21 {
22
23 X_MB_runtime_t *rt;
24 rt = X_MB_new(":0.0", 800, 600);
25 engine_t *en = (engine_t *) malloc(sizeof(engine_t));
26
27 en->rt = rt;
28 en->rdman = X_MB_rdman(rt);
29 return en;
30 }
31 void engine_close(engine_t *en)
32 {
33 /*
34 * Start handle connections, includes one to X server.
35 * User start to interact with the application.
36 */
37 X_MB_handle_connection(en->rt);
38
39 /*
40 * Clean
41 */
42 menu_free(en->menu);
43 X_MB_free(en->rt);
44 free(en);
45 }
46 #define COORD_SHOW(group) coord_show(group);rdman_coord_changed(X_MB_rdman(ex_rt->rt), group)
47 #define COORD_HIDE(group) coord_hide(group);rdman_coord_changed(X_MB_rdman(ex_rt->rt), group)
48
49
50 void coord_move(coord_t *c, co_aix x, co_aix y)
51 {
52 c->matrix[2] = x;
53 c->matrix[5] = y;
54 }
55
56
57 static void cursor_press_handler(event_t *evt, void *arg) {
58 engine_t *en = (engine_t *) arg;
59 mouse_event_t *mev = (mouse_event_t *) evt;
60
61 en->start_x = mev->x;
62 en->start_y = mev->y;
63 en->orx = en->menu->cursor->matrix[2];
64 en->ory = en->menu->cursor->matrix[5];
65 printf("pressed %g %g\n",en->orx,en->ory);
66 en->state = 1;
67 }
68
69 static void cursor_release_handler(event_t *evt, void *arg) {
70 engine_t *en = (engine_t *) arg;
71 printf("up\n");
72 en->state = 0;
73 }
74
75 static void cursor_move_handler(event_t *evt, void *arg) {
76 engine_t *en = (engine_t *) arg;
77 mouse_event_t *mev = (mouse_event_t *) evt;
78
79 if (en->state) {
80 printf("move to (%d %d)\n", mev->x,mev->y);
81 coord_move(en->menu->cursor,en->orx + (mev->x-en->start_x),en->ory + (mev->y-en->start_y));
82 rdman_coord_changed(en->rdman, en->menu->cursor);
83 /* Update changed part to UI. */
84 rdman_redraw_changed(en->rdman);
85 }
86 }
87
88 int main(int argc, char * const argv[]) {
89 subject_t *subject;
90 engine_t *en;
91
92 en = engine_init();
93 en->menu = menu_new(en->rdman, en->rdman->root_coord);
94
95 /*
96 * Register observers to subjects of events for objects.
97 */
98 subject = coord_get_mouse_event(en->menu->cursor);
99 subject_add_event_observer(subject, EVT_MOUSE_BUT_PRESS, cursor_press_handler, en);
100 subject_add_event_observer(subject, EVT_MOUSE_BUT_RELEASE, cursor_release_handler, en);
101 subject_add_event_observer(subject, EVT_MOUSE_MOVE, cursor_move_handler, en);
102
103
104 engine_close(en);
105
106 return 0;
107 }
108
109 /* vim: set ts=4 */