ref: 6df0ab868009646160037f90e654bad0352e082f
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 */