ref: 5e44a80f1d3be806700efa669a8322fb585efe34
dir: /textscreen/txt_widget.h/
//
// 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 */