ref: d0c36735aaeb178d936fc7434d5e3a4b356430d6
dir: /textscreen/txt_table.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_TABLE_H
#define TXT_TABLE_H
/**
* @file txt_table.h
*
* Table widget.
*/
/**
* Magic value that if used in a table, will indicate that the cell is
* empty and the widget in the cell to the left can overflow into it.
*/
#define TXT_TABLE_OVERFLOW_RIGHT (&txt_table_overflow_right)
/**
* Magic value that if used in a table, will indicate that the cell is
* empty and the widget in the cell above it can overflow down into it.
*/
#define TXT_TABLE_OVERFLOW_DOWN (&txt_table_overflow_down)
/**
* Magic value that if given to @ref TXT_AddWidget(), will pad out all
* columns until the end of line.
*/
#define TXT_TABLE_EOL (&txt_table_eol)
/**
* Indicates an empty space to @ref TXT_AddWidgets(). Equivalent to
* TXT_AddWidget(table, NULL), except that NULL is used by TXT_AddWidgets()
* to indicate the end of input.
*/
#define TXT_TABLE_EMPTY (&txt_table_empty)
/**
* Table widget.
*
* A table is a widget that contains other widgets. It may have
* multiple columns, in which case the child widgets are laid out
* in a grid. Columns automatically grow as necessary, although
* minimum column widths can be set using @ref TXT_SetColumnWidths.
*
* To create a new table, use @ref TXT_NewTable. It is also
* possible to use @ref TXT_NewHorizBox to create a table, specifying
* widgets to place inside a horizontal list. A vertical list is
* possible simply by creating a table containing a single column.
*/
typedef struct txt_table_s txt_table_t;
#include "txt_widget.h"
struct txt_table_s
{
txt_widget_t widget;
// Widgets in this table
// The widget at (x,y) in the table is widgets[columns * y + x]
txt_widget_t **widgets;
int num_widgets;
// Number of columns
int columns;
// Currently selected:
int selected_x;
int selected_y;
};
extern txt_widget_class_t txt_table_class;
extern txt_widget_t txt_table_overflow_right;
extern txt_widget_t txt_table_overflow_down;
extern txt_widget_t txt_table_eol;
extern txt_widget_t txt_table_empty;
void TXT_InitTable(txt_table_t *table, int columns);
/**
* Create a new table.
*
* @param columns The number of columns in the new table.
* @return Pointer to the new table structure.
*/
txt_table_t *TXT_NewTable(int columns);
/**
* Create a table containing the specified widgets packed horizontally,
* from left to right.
*
* The arguments to this function are variable. Each argument must
* be a pointer to a widget, and the list is terminated with a
* NULL.
*
* @return Pointer to the new table structure.
*/
txt_table_t *TXT_NewHorizBox(TXT_UNCAST_ARG(first_widget), ...);
/**
* Get the currently selected widget within a table.
*
* This function will recurse through subtables if necessary.
*
* @param table The table.
* @return Pointer to the widget that is currently selected.
*/
txt_widget_t *TXT_GetSelectedWidget(TXT_UNCAST_ARG(table));
/**
* Add a widget to a table.
*
* Widgets are added to tables horizontally, from left to right.
* For example, for a table with three columns, the first call
* to this function will add a widget to the first column, the second
* call to the second column, the third call to the third column,
* and the fourth will return to the first column, starting a new
* row.
*
* For adding many widgets, it may be easier to use
* @ref TXT_AddWidgets.
*
* @param table The table.
* @param widget The widget to add.
*/
void TXT_AddWidget(TXT_UNCAST_ARG(table), TXT_UNCAST_ARG(widget));
/**
* Add multiple widgets to a table.
*
* Widgets are added as described in the documentation for the
* @ref TXT_AddWidget function. This function adds multiple
* widgets. The number of arguments is variable, and the argument
* list must be terminated by a NULL pointer.
*
* @param table The table.
*/
void TXT_AddWidgets(TXT_UNCAST_ARG(table), ...);
/**
* Select the given widget that is contained within the specified
* table.
*
* This function will recursively search through subtables if
* necessary.
*
* @param table The table.
* @param widget The widget to select.
* @return Non-zero (true) if it has been selected,
* or zero (false) if it was not found within
* this table.
*/
int TXT_SelectWidget(TXT_UNCAST_ARG(table), TXT_UNCAST_ARG(widget));
/**
* Change the number of columns in the table.
*
* Existing widgets in the table will be preserved, unless the change
* reduces the number of columns, in which case the widgets from the
* 'deleted' columns will be freed.
*
* This function can be useful for changing the number of columns in
* a window, which by default are tables containing a single column.
*
* @param table The table.
* @param new_columns The new number of columns.
*/
void TXT_SetTableColumns(TXT_UNCAST_ARG(table), int new_columns);
/**
* Set the widths of the columns of the table.
*
* The arguments to this function are variable, and correspond
* to the number of columns in the table. For example, if a table
* has five columns, the width of each of the five columns must be
* specified.
*
* The width values are in number of characters.
*
* Note that this function only sets the minimum widths for columns;
* if the columns contain widgets that are wider than the widths
* specified, they will be larger.
*
* @param table The table.
*/
void TXT_SetColumnWidths(TXT_UNCAST_ARG(table), ...);
/**
* Remove all widgets from a table.
*
* @param table The table.
*/
void TXT_ClearTable(TXT_UNCAST_ARG(table));
/**
* Hack to move the selection in a table by a 'page', triggered by the
* scrollpane. This acts as per the keyboard events for the arrows, but moves
* the selection by at least the specified number of characters.
*
* @param table The table.
* @param pagex Minimum distance to move the selection horizontally.
* @param pagey Minimum distance to move the selection vertically.
* @return Non-zero if the selection has been changed.
*/
int TXT_PageTable(TXT_UNCAST_ARG(table), int pagex, int pagey);
#endif /* #ifndef TXT_TABLE_T */