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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 2006 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
#include <stdlib.h>
#include <string.h>
#include "txt_io.h"
#include "txt_widget.h"
typedef struct
{
char *signal_name;
TxtWidgetSignalFunc func;
void *user_data;
} txt_callback_t;
struct txt_callback_table_s
{
int refcount;
txt_callback_t *callbacks;
int num_callbacks;
};
txt_callback_table_t *TXT_NewCallbackTable(void)
{
txt_callback_table_t *table;
table = malloc(sizeof(txt_callback_table_t));
table->callbacks = NULL;
table->num_callbacks = 0;
table->refcount = 1;
return table;
}
void TXT_RefCallbackTable(txt_callback_table_t *table)
{
++table->refcount;
}
void TXT_UnrefCallbackTable(txt_callback_table_t *table)
{
int i;
--table->refcount;
if (table->refcount == 0)
{
// No more references to this table
for (i=0; i<table->num_callbacks; ++i)
{
free(table->callbacks[i].signal_name);
}
free(table->callbacks);
free(table);
}
}
void TXT_InitWidget(TXT_UNCAST_ARG(widget), txt_widget_class_t *widget_class)
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class = widget_class;
widget->callback_table = TXT_NewCallbackTable();
// Default values: visible and selectable
widget->selectable = 1;
widget->visible = 1;
// Align left by default
widget->align = TXT_HORIZ_LEFT;
}
void TXT_SignalConnect(TXT_UNCAST_ARG(widget),
const char *signal_name,
TxtWidgetSignalFunc func,
void *user_data)
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_callback_table_t *table;
txt_callback_t *callback;
table = widget->callback_table;
// Add a new callback to the table
table->callbacks
= realloc(table->callbacks,
sizeof(txt_callback_t) * (table->num_callbacks + 1));
callback = &table->callbacks[table->num_callbacks];
++table->num_callbacks;
callback->signal_name = strdup(signal_name);
callback->func = func;
callback->user_data = user_data;
}
void TXT_EmitSignal(TXT_UNCAST_ARG(widget), const char *signal_name)
{
TXT_CAST_ARG(txt_widget_t, widget);
txt_callback_table_t *table;
int i;
table = widget->callback_table;
// Don't destroy the table while we're searching through it
// (one of the callbacks may destroy this window)
TXT_RefCallbackTable(table);
// Search the table for all callbacks with this name and invoke
// the functions.
for (i=0; i<table->num_callbacks; ++i)
{
if (!strcmp(table->callbacks[i].signal_name, signal_name))
{
table->callbacks[i].func(widget, table->callbacks[i].user_data);
}
}
// Finished using the table
TXT_UnrefCallbackTable(table);
}
void TXT_CalcWidgetSize(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class->size_calc(widget);
}
void TXT_DrawWidget(TXT_UNCAST_ARG(widget), int selected)
{
TXT_CAST_ARG(txt_widget_t, widget);
// For convenience...
TXT_GotoXY(widget->x, widget->y);
// Call drawer method
widget->widget_class->drawer(widget, selected);
}
void TXT_DestroyWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->widget_class->destructor(widget);
TXT_UnrefCallbackTable(widget->callback_table);
free(widget);
}
int TXT_WidgetKeyPress(TXT_UNCAST_ARG(widget), int key)
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->key_press != NULL)
{
return widget->widget_class->key_press(widget, key);
}
return 0;
}
void TXT_SetWidgetAlign(TXT_UNCAST_ARG(widget), txt_horiz_align_t horiz_align)
{
TXT_CAST_ARG(txt_widget_t, widget);
widget->align = horiz_align;
}
void TXT_WidgetMousePress(TXT_UNCAST_ARG(widget), int x, int y, int b)
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->mouse_press != NULL)
{
widget->widget_class->mouse_press(widget, x, y, b);
}
}
void TXT_LayoutWidget(TXT_UNCAST_ARG(widget))
{
TXT_CAST_ARG(txt_widget_t, widget);
if (widget->widget_class->layout != NULL)
{
widget->widget_class->layout(widget);
}
}
|
