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
|
//
// Copyright(C) 2005-2014 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.
//
#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));
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));
typedef int (*TxtWidgetSelectableFunc)(TXT_UNCAST_ARG(widget));
typedef void (*TxtWidgetFocusFunc)(TXT_UNCAST_ARG(widget), int focused);
struct txt_widget_class_s
{
TxtWidgetSelectableFunc selectable;
TxtWidgetSizeCalc size_calc;
TxtWidgetDrawer drawer;
TxtWidgetKeyPress key_press;
TxtWidgetDestroy destructor;
TxtMousePressFunc mouse_press;
TxtWidgetLayoutFunc layout;
TxtWidgetFocusFunc focus_change;
};
struct txt_widget_s
{
txt_widget_class_t *widget_class;
txt_callback_table_t *callback_table;
int visible;
txt_horiz_align_t align;
int focused;
// These are set automatically when the window is drawn and should
// not be set manually.
int x, y;
unsigned int w, h;
// Pointer up to parent widget that contains this widget.
txt_widget_t *parent;
};
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));
void TXT_EmitSignal(TXT_UNCAST_ARG(widget), const 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));
int TXT_AlwaysSelectable(TXT_UNCAST_ARG(widget));
int TXT_NeverSelectable(TXT_UNCAST_ARG(widget));
void TXT_SetWidgetFocus(TXT_UNCAST_ARG(widget), int focused);
/**
* 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), const 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);
/**
* Query whether a widget is selectable with the cursor.
*
* @param widget The widget.
* @return Non-zero if the widget is selectable.
*/
int TXT_SelectableWidget(TXT_UNCAST_ARG(widget));
/**
* Query whether the mouse is hovering over the specified widget.
*
* @param widget The widget.
* @return Non-zero if the mouse cursor is over the widget.
*/
int TXT_HoveringOverWidget(TXT_UNCAST_ARG(widget));
/**
* Set the background to draw the specified widget, depending on
* whether it is selected and the mouse is hovering over it.
*
* @param widget The widget.
*/
void TXT_SetWidgetBG(TXT_UNCAST_ARG(widget));
/**
* Query whether the specified widget is contained within another
* widget.
*
* @param haystack The widget that might contain needle.
* @param needle The widget being queried.
*/
int TXT_ContainsWidget(TXT_UNCAST_ARG(haystack), TXT_UNCAST_ARG(needle));
#endif /* #ifndef TXT_WIDGET_H */
|
