ref: fe5645bbf441fa3fdc1ba72cc0152465b5411d5a
dir: /textscreen/txt_table.c/
// 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. // #include <stdarg.h> #include <stdlib.h> #include <string.h> #include "doomkeys.h" #include "txt_desktop.h" #include "txt_gui.h" #include "txt_io.h" #include "txt_main.h" #include "txt_separator.h" #include "txt_strut.h" #include "txt_table.h" static void TXT_TableDestructor(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); int i; // Free all widgets for (i=0; i<table->num_widgets; ++i) { if (table->widgets[i] != NULL) { TXT_DestroyWidget(table->widgets[i]); } } // Free table resources free(table->widgets); } static int TableRows(txt_table_t *table) { return (table->num_widgets + table->columns - 1) / table->columns; } static void CalcRowColSizes(txt_table_t *table, unsigned int *row_heights, unsigned int *col_widths) { int x, y; int rows; txt_widget_t *widget; rows = TableRows(table); memset(col_widths, 0, sizeof(int) * table->columns); for (y=0; y<rows; ++y) { row_heights[y] = 0; for (x=0; x<table->columns; ++x) { if (y * table->columns + x >= table->num_widgets) break; widget = table->widgets[y * table->columns + x]; // NULL represents an empty spacer if (widget != NULL) { TXT_CalcWidgetSize(widget); if (widget->h > row_heights[y]) row_heights[y] = widget->h; if (widget->w > col_widths[x]) col_widths[x] = widget->w; } } } } static void TXT_CalcTableSize(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); unsigned int *column_widths; unsigned int *row_heights; int x, y; int rows; rows = TableRows(table); row_heights = malloc(sizeof(int) * rows); column_widths = malloc(sizeof(int) * table->columns); CalcRowColSizes(table, row_heights, column_widths); table->widget.w = 0; for (x=0; x<table->columns; ++x) { table->widget.w += column_widths[x]; } table->widget.h = 0; for (y=0; y<rows; ++y) { table->widget.h += row_heights[y]; } free(row_heights); free(column_widths); } void TXT_AddWidget(TXT_UNCAST_ARG(table), TXT_UNCAST_ARG(widget)) { TXT_CAST_ARG(txt_table_t, table); TXT_CAST_ARG(txt_widget_t, widget); if (table->num_widgets > 0) { txt_widget_t *last_widget; last_widget = table->widgets[table->num_widgets - 1]; if (widget != NULL && last_widget != NULL && widget->widget_class == &txt_separator_class && last_widget->widget_class == &txt_separator_class) { // The previous widget added was a separator; replace // it with this one. // // This way, if the first widget added to a window is // a separator, it replaces the "default" separator that // the window itself adds on creation. table->widgets[table->num_widgets - 1] = widget; TXT_DestroyWidget(last_widget); return; } } table->widgets = realloc(table->widgets, sizeof(txt_widget_t *) * (table->num_widgets + 1)); table->widgets[table->num_widgets] = widget; ++table->num_widgets; } // Add multiple widgets to a table. void TXT_AddWidgets(TXT_UNCAST_ARG(table), ...) { TXT_CAST_ARG(txt_table_t, table); va_list args; txt_widget_t *widget; va_start(args, TXT_UNCAST_ARG_NAME(table)); // Keep adding widgets until a NULL is reached. for (;;) { widget = va_arg(args, txt_widget_t *); if (widget == NULL) { break; } TXT_AddWidget(table, widget); } va_end(args); } static int SelectableWidget(txt_table_t *table, int x, int y) { txt_widget_t *widget; int i; if (x < 0 || x >= table->columns) { return 0; } i = y * table->columns + x; if (i >= 0 && i < table->num_widgets) { widget = table->widgets[i]; return widget != NULL && widget->selectable && widget->visible; } return 0; } // Tries to locate a selectable widget in the given row, returning // the column number of the first column available or -1 if none are // available in the given row. // // Starts from start_col, then searches nearby columns. static int FindSelectableColumn(txt_table_t *table, int row, int start_col) { int x; for (x=0; x<table->columns; ++x) { // Search to the right if (SelectableWidget(table, start_col + x, row)) { return start_col + x; } // Search to the left if (SelectableWidget(table, start_col - x, row)) { return start_col - x; } } // None available return -1; } static int TXT_TableKeyPress(TXT_UNCAST_ARG(table), int key) { TXT_CAST_ARG(txt_table_t, table); int selected; int rows; rows = TableRows(table); // Send to the currently selected widget first selected = table->selected_y * table->columns + table->selected_x; if (selected >= 0 && selected < table->num_widgets) { if (table->widgets[selected] != NULL && table->widgets[selected]->selectable && TXT_WidgetKeyPress(table->widgets[selected], key)) { return 1; } } if (key == KEY_DOWNARROW) { int new_x, new_y; // Move cursor down to the next selectable widget for (new_y = table->selected_y + 1; new_y < rows; ++new_y) { new_x = FindSelectableColumn(table, new_y, table->selected_x); if (new_x >= 0) { // Found a selectable widget in this column! table->selected_x = new_x; table->selected_y = new_y; return 1; } } } if (key == KEY_UPARROW) { int new_x, new_y; // Move cursor up to the next selectable widget for (new_y = table->selected_y - 1; new_y >= 0; --new_y) { new_x = FindSelectableColumn(table, new_y, table->selected_x); if (new_x >= 0) { // Found a selectable widget in this column! table->selected_x = new_x; table->selected_y = new_y; return 1; } } } if (key == KEY_LEFTARROW) { int new_x; // Move cursor left for (new_x = table->selected_x - 1; new_x >= 0; --new_x) { if (SelectableWidget(table, new_x, table->selected_y)) { // Found a selectable widget! table->selected_x = new_x; return 1; } } } if (key == KEY_RIGHTARROW) { int new_x; // Move cursor left for (new_x = table->selected_x + 1; new_x < table->columns; ++new_x) { if (SelectableWidget(table, new_x, table->selected_y)) { // Found a selectable widget! table->selected_x = new_x; return 1; } } } return 0; } // Check the currently selected widget in the table is valid. static void CheckValidSelection(txt_table_t *table) { int rows; int new_x, new_y; rows = TableRows(table); for (new_y = table->selected_y; new_y < rows; ++new_y) { new_x = FindSelectableColumn(table, new_y, table->selected_x); if (new_x >= 0) { // Found a selectable column. table->selected_x = new_x; table->selected_y = new_y; break; } } } static void LayoutCell(txt_table_t *table, int x, int y, int col_width, int draw_x, int draw_y) { txt_widget_t *widget; widget = table->widgets[y * table->columns + x]; // Adjust x position based on alignment property switch (widget->align) { case TXT_HORIZ_LEFT: widget->w = col_width; break; case TXT_HORIZ_CENTER: TXT_CalcWidgetSize(widget); // Separators are always drawn left-aligned. if (widget->widget_class != &txt_separator_class) { draw_x += (col_width - widget->w) / 2; } break; case TXT_HORIZ_RIGHT: TXT_CalcWidgetSize(widget); if (widget->widget_class != &txt_separator_class) { draw_x += col_width - widget->w; } break; } // Set the position for this widget widget->x = draw_x; widget->y = draw_y; // Recursively lay out any widgets contained in the widget TXT_LayoutWidget(widget); } static void TXT_TableLayout(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); unsigned int *column_widths; unsigned int *row_heights; int draw_x, draw_y; int x, y; int i; int rows; // Work out the column widths and row heights rows = TableRows(table); column_widths = malloc(sizeof(int) * table->columns); row_heights = malloc(sizeof(int) * rows); CalcRowColSizes(table, row_heights, column_widths); // If this table only has one column, expand column size to fit // the display width. Ensures that separators reach the window edges // when drawing windows. if (table->columns == 1) { column_widths[0] = table->widget.w; } // Draw all cells draw_y = table->widget.y; for (y=0; y<rows; ++y) { draw_x = table->widget.x; for (x=0; x<table->columns; ++x) { i = y * table->columns + x; if (i >= table->num_widgets) break; if (table->widgets[i] != NULL) { LayoutCell(table, x, y, column_widths[x], draw_x, draw_y); } draw_x += column_widths[x]; } draw_y += row_heights[y]; } free(row_heights); free(column_widths); } static void TXT_TableDrawer(TXT_UNCAST_ARG(table), int selected) { TXT_CAST_ARG(txt_table_t, table); txt_widget_t *widget; int selected_cell; int i; // Check the table's current selection points at something valid before // drawing. CheckValidSelection(table); // Find the index of the currently-selected widget. selected_cell = table->selected_y * table->columns + table->selected_x; // Draw all cells for (i=0; i<table->num_widgets; ++i) { widget = table->widgets[i]; if (widget != NULL) { TXT_GotoXY(widget->x, widget->y); TXT_DrawWidget(widget, selected && i == selected_cell); } } } // Responds to mouse presses static void TXT_TableMousePress(TXT_UNCAST_ARG(table), int x, int y, int b) { TXT_CAST_ARG(txt_table_t, table); txt_widget_t *widget; int i; for (i=0; i<table->num_widgets; ++i) { widget = table->widgets[i]; // NULL widgets are spacers if (widget != NULL) { if (x >= widget->x && x < (signed) (widget->x + widget->w) && y >= widget->y && y < (signed) (widget->y + widget->h)) { // This is the widget that was clicked! // Select the cell if the widget is selectable if (widget->selectable) { table->selected_x = i % table->columns; table->selected_y = i / table->columns; } // Propagate click TXT_WidgetMousePress(widget, x, y, b); break; } } } } txt_widget_class_t txt_table_class = { TXT_CalcTableSize, TXT_TableDrawer, TXT_TableKeyPress, TXT_TableDestructor, TXT_TableMousePress, TXT_TableLayout, }; void TXT_InitTable(txt_table_t *table, int columns) { int i; TXT_InitWidget(table, &txt_table_class); table->columns = columns; table->widgets = NULL; table->num_widgets = 0; table->selected_x = 0; table->selected_y = 0; // Add a strut for each column at the start of the table. // These are used by the TXT_SetColumnWidths function below: // the struts are created with widths of 0 each, but this // function changes them. for (i=0; i<columns; ++i) { TXT_AddWidget(table, TXT_NewStrut(0, 0)); } } txt_table_t *TXT_NewTable(int columns) { txt_table_t *table; table = malloc(sizeof(txt_table_t)); TXT_InitTable(table, columns); return table; } // Create a horizontal table from a list of widgets. txt_table_t *TXT_NewHorizBox(TXT_UNCAST_ARG(first_widget), ...) { TXT_CAST_ARG(txt_widget_t, first_widget); txt_table_t *result; va_list args; int num_args; // First, find the number of arguments to determine the width of // the box. va_start(args, TXT_UNCAST_ARG_NAME(first_widget)); num_args = 1; for (;;) { txt_widget_t *widget; widget = va_arg(args, txt_widget_t *); if (widget == NULL) { // End of list break; } else { ++num_args; } } va_end(args); // Create the table. result = TXT_NewTable(num_args); TXT_AddWidget(result, first_widget); // Go through the list again and add each widget. va_start(args, TXT_UNCAST_ARG_NAME(first_widget)); for (;;) { txt_widget_t *widget; widget = va_arg(args, txt_widget_t *); if (widget == NULL) { // End of list break; } else { TXT_AddWidget(result, widget); } } va_end(args); return result; } // Selects a given widget in a table, recursively searching any tables // within this table. Returns 1 if successful, 0 if unsuccessful. int TXT_SelectWidget(TXT_UNCAST_ARG(table), TXT_UNCAST_ARG(widget)) { TXT_CAST_ARG(txt_table_t, table); TXT_CAST_ARG(txt_widget_t, widget); int i; for (i=0; i<table->num_widgets; ++i) { if (table->widgets[i] == NULL) { continue; } if (table->widgets[i] == widget) { // Found the item! Select it and return. table->selected_x = i % table->columns; table->selected_y = i / table->columns; return 1; } if (table->widgets[i]->widget_class == &txt_table_class) { // This item is a subtable. Recursively search this table. if (TXT_SelectWidget(table->widgets[i], widget)) { // Found it in the subtable. Select this subtable and return. table->selected_x = i % table->columns; table->selected_y = i / table->columns; return 1; } } } // Not found. return 0; } // Sets the widths of columns in a table. void TXT_SetColumnWidths(TXT_UNCAST_ARG(table), ...) { TXT_CAST_ARG(txt_table_t, table); va_list args; txt_strut_t *strut; int i; int width; va_start(args, TXT_UNCAST_ARG_NAME(table)); for (i=0; i<table->columns; ++i) { width = va_arg(args, int); strut = (txt_strut_t *) table->widgets[i]; strut->width = width; } va_end(args); }