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
|
// 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.
//
#ifndef TXT_WIDGET_H
#define TXT_WIDGET_H
/**
* @file txt_widget.h
*
* Base "widget" GUI component class.
*/
#ifndef DOXYGEN
#define TXT_UNCAST_ARG_NAME(name) uncast_ ## name
#define TXT_UNCAST_ARG(name) void * TXT_UNCAST_ARG_NAME(name)
#define TXT_CAST_ARG(type, name) type *name = (type *) uncast_ ## name
#else
#define TXT_UNCAST_ARG(name) txt_widget_t *name
#endif
typedef enum
{
TXT_VERT_TOP,
TXT_VERT_CENTER,
TXT_VERT_BOTTOM,
} txt_vert_align_t;
typedef enum
{
TXT_HORIZ_LEFT,
TXT_HORIZ_CENTER,
TXT_HORIZ_RIGHT,
} txt_horiz_align_t;
/**
* A GUI widget.
*
* A widget is an individual component of a GUI. Various different widget
* types exist.
*
* Widgets may emit signals. The types of signal emitted by a widget
* depend on the type of the widget. It is possible to be notified
* when a signal occurs using the @ref TXT_SignalConnect function.
*/
typedef struct txt_widget_s txt_widget_t;
typedef struct txt_widget_class_s txt_widget_class_t;
typedef struct txt_callback_table_s txt_callback_table_t;
typedef void (*TxtWidgetSizeCalc)(TXT_UNCAST_ARG(widget));
typedef void (*TxtWidgetDrawer)(TXT_UNCAST_ARG(widget), int selected);
typedef void (*TxtWidgetDestroy)(TXT_UNCAST_ARG(widget));
typedef int (*TxtWidgetKeyPress)(TXT_UNCAST_ARG(widget), int key);
typedef void (*TxtWidgetSignalFunc)(TXT_UNCAST_ARG(widget), void *user_data);
typedef void (*TxtMousePressFunc)(TXT_UNCAST_ARG(widget), int x, int y, int b);
typedef void (*TxtWidgetLayoutFunc)(TXT_UNCAST_ARG(widget));
struct txt_widget_class_s
{
TxtWidgetSizeCalc size_calc;
TxtWidgetDrawer drawer;
TxtWidgetKeyPress key_press;
TxtWidgetDestroy destructor;
TxtMousePressFunc mouse_press;
TxtWidgetLayoutFunc layout;
};
struct txt_widget_s
{
txt_widget_class_t *widget_class;
txt_callback_table_t *callback_table;
int selectable;
int visible;
txt_horiz_align_t align;
// These are set automatically when the window is drawn and should
// not be set manually.
int x, y;
unsigned int w, h;
};
void TXT_InitWidget(TXT_UNCAST_ARG(widget), txt_widget_class_t *widget_class);
void TXT_CalcWidgetSize(TXT_UNCAST_ARG(widget));
void TXT_DrawWidget(TXT_UNCAST_ARG(widget), int selected);
void TXT_EmitSignal(TXT_UNCAST_ARG(widget), char *signal_name);
int TXT_WidgetKeyPress(TXT_UNCAST_ARG(widget), int key);
void TXT_WidgetMousePress(TXT_UNCAST_ARG(widget), int x, int y, int b);
void TXT_DestroyWidget(TXT_UNCAST_ARG(widget));
void TXT_LayoutWidget(TXT_UNCAST_ARG(widget));
/**
* Set a callback function to be invoked when a signal occurs.
*
* @param widget The widget to watch.
* @param signal_name The signal to watch.
* @param func The callback function to invoke.
* @param user_data User-specified pointer to pass to the callback function.
*/
void TXT_SignalConnect(TXT_UNCAST_ARG(widget), char *signal_name,
TxtWidgetSignalFunc func, void *user_data);
/**
* Set the policy for how a widget should be aligned within a table.
* By default, widgets are aligned to the left of the column.
*
* @param widget The widget.
* @param horiz_align The alignment to use.
*/
void TXT_SetWidgetAlign(TXT_UNCAST_ARG(widget), txt_horiz_align_t horiz_align);
#endif /* #ifndef TXT_WIDGET_H */
|
