ref: fdb6b0f31f5ff2d14d44689eb477a54d5f65157e
dir: /textscreen/txt_table.c/
// // 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. // #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" txt_widget_t txt_table_overflow_right; txt_widget_t txt_table_overflow_down; txt_widget_t txt_table_eol; txt_widget_t txt_table_empty; // Returns true if the given widget in the table's widgets[] array refers // to an actual widget - not NULL, or one of the special overflow pointers. static int IsActualWidget(txt_widget_t *widget) { return widget != NULL && widget != &txt_table_overflow_right && widget != &txt_table_overflow_down; } // Remove all entries from a table void TXT_ClearTable(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); int i; // Free all widgets // Skip over the first (num_columns) widgets in the array, as these // are the column struts used to control column width for (i=table->columns; i<table->num_widgets; ++i) { if (IsActualWidget(table->widgets[i])) { TXT_DestroyWidget(table->widgets[i]); } } // Shrink the table to just the column strut widgets table->num_widgets = table->columns; } static void TXT_TableDestructor(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); TXT_ClearTable(table); } static int TableRows(txt_table_t *table) { return (table->num_widgets + table->columns - 1) / table->columns; } // Most widgets occupy just one cell of a table, but if the special // overflow constants are used, they can occupy multiple cells. // This function figures out for a widget in a given cell, which // cells it should actually occupy (always a rectangle). static void CellOverflowedSize(txt_table_t *table, int x, int y, int *w, int *h) { txt_widget_t *widget; int x1, y1; if (!IsActualWidget(table->widgets[y * table->columns + x])) { *w = 0; *h = 0; return; } *w = table->columns - x; *h = 0; for (y1 = y; y1 < TableRows(table); ++y1) { // Every overflow cell must point to either (x, y) or another // overflow cell. This means the first in every row must be // txt_table_overflow_down. if (y1 * table->columns + x >= table->num_widgets) { break; } widget = table->widgets[y1 * table->columns + x]; if (y1 != y && widget != &txt_table_overflow_down) { break; } for (x1 = x + 1; x1 < x + *w; ++x1) { if (y1 * table->columns + x1 >= table->num_widgets) { break; } // Can be either type of overflow, except on the first row. // Otherwise we impose a limit on the width. widget = table->widgets[y1 * table->columns + x1]; if (widget != &txt_table_overflow_right && (widget != &txt_table_overflow_down || y1 == y)) { *w = x1 - x; break; } } ++*h; } } static int IsOverflowingCell(txt_table_t *table, int x, int y) { int w, h; CellOverflowedSize(table, x, y, &w, &h); return w > 1 || h > 1; } // Using the given column/row size tables, calculate the size of the given // widget, storing the result in (w, h). static void CalculateWidgetDimensions(txt_table_t *table, int x, int y, unsigned int *column_widths, unsigned int *row_heights, unsigned int *w, unsigned int *h) { int cell_w, cell_h; int x1, y1; // Find which cells this widget occupies. CellOverflowedSize(table, x, y, &cell_w, &cell_h); // Add up column / row widths / heights to get the actual dimensions. *w = 0; for (x1 = x; x1 < x + cell_w; ++x1) { *w += column_widths[x1]; } *h = 0; for (y1 = y; y1 < y + cell_h; ++y1) { *h += row_heights[y1]; } } 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]; if (IsActualWidget(widget)) { TXT_CalcWidgetSize(widget); } // In the first pass we ignore overflowing cells. if (IsOverflowingCell(table, x, y)) { continue; } // NULL represents an empty spacer if (IsActualWidget(widget)) { if (widget->h > row_heights[y]) row_heights[y] = widget->h; if (widget->w > col_widths[x]) col_widths[x] = widget->w; } } } // In the second pass, we go through again and process overflowing // widgets, to ensure that they will fit. for (y = 0; y < rows; ++y) { for (x = 0; x < table->columns; ++x) { unsigned int w, h; if (y * table->columns + x >= table->num_widgets) break; widget = table->widgets[y * table->columns + x]; if (!IsActualWidget(widget)) { continue; } // Expand column width and row heights as needed. CalculateWidgetDimensions(table, x, y, col_widths, row_heights, &w, &h); if (w < widget->w) { col_widths[x] += widget->w - w; } if (h < widget->h) { row_heights[y] += widget->h - h; } } } } 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); } static void FillRowToEnd(txt_table_t *table) { while ((table->num_widgets % table->columns) != 0) { TXT_AddWidget(table, &txt_table_overflow_right); } } 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); int is_separator; int i; // Convenience alias for NULL: if (widget == &txt_table_empty) { widget = NULL; } else if (widget == &txt_table_eol) { FillRowToEnd(table); return; } // We have special handling for the separator widget: is_separator = IsActualWidget(widget) && widget->widget_class == &txt_separator_class; // If we add two separators consecutively, the new separator replaces the // first. This allows us to override the "implicit" separator that is // added at the top of a window when it is created. if (is_separator) { for (i = table->num_widgets - 1; i >= 0; --i) { txt_widget_t *last_widget; last_widget = table->widgets[i]; if (IsActualWidget(last_widget) && widget->widget_class == &txt_separator_class && last_widget->widget_class == &txt_separator_class) { table->widgets[i] = widget; TXT_DestroyWidget(last_widget); return; } else if (last_widget != &txt_table_overflow_right) { break; } } } // Separators begin on a new line. if (is_separator) { FillRowToEnd(table); } table->widgets = realloc(table->widgets, sizeof(txt_widget_t *) * (table->num_widgets + 1)); table->widgets[table->num_widgets] = widget; ++table->num_widgets; // Maintain parent pointer. if (IsActualWidget(widget)) { widget->parent = &table->widget; } // Separators always take up the entire line. if (is_separator) { FillRowToEnd(table); } } // 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 SelectableCell(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 IsActualWidget(widget) && TXT_SelectableWidget(widget) && 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 (SelectableCell(table, start_col + x, row)) { return start_col + x; } // Search to the left if (SelectableCell(table, start_col - x, row)) { return start_col - x; } } // None available return -1; } // Change the selected widget. static void ChangeSelection(txt_table_t *table, int x, int y) { txt_widget_t *cur_widget; txt_widget_t *new_widget; int i; // No change? if (x == table->selected_x && y == table->selected_y) { return; } // Unfocus current widget: i = table->selected_y * table->columns + table->selected_x; if (i < table->num_widgets) { cur_widget = table->widgets[i]; if (table->widget.focused && IsActualWidget(cur_widget)) { TXT_SetWidgetFocus(cur_widget, 0); } } // Focus new widget. new_widget = table->widgets[y * table->columns + x]; table->selected_x = x; table->selected_y = y; if (table->widget.focused && new_widget != NULL) { TXT_SetWidgetFocus(new_widget, 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 (IsActualWidget(table->widgets[selected]) && TXT_SelectableWidget(table->widgets[selected]) && TXT_WidgetKeyPress(table->widgets[selected], key)) { return 1; } } if (key == KEY_TAB) { int dir; int i; dir = TXT_GetModifierState(TXT_MOD_SHIFT) ? -1 : 1; // Cycle through all widgets until we find one that can be selected. for (i = table->selected_y * table->columns + table->selected_x + dir; i >= 0 && i < table->num_widgets; i += dir) { if (IsActualWidget(table->widgets[i]) && TXT_SelectableWidget(table->widgets[i])) { ChangeSelection(table, i % table->columns, i / table->columns); return 1; } } return 0; } 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! ChangeSelection(table, new_x, 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! ChangeSelection(table, new_x, 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 (SelectableCell(table, new_x, table->selected_y)) { // Found a selectable widget! ChangeSelection(table, new_x, table->selected_y); 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 (SelectableCell(table, new_x, table->selected_y)) { // Found a selectable widget! ChangeSelection(table, new_x, table->selected_y); 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. ChangeSelection(table, new_x, new_y); break; } } } static void LayoutCell(txt_table_t *table, int x, int y, int draw_x, int draw_y) { txt_widget_t *widget; int col_width; widget = table->widgets[y * table->columns + x]; col_width = widget->w; // 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; txt_widget_t *widget; 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; widget = table->widgets[i]; if (IsActualWidget(widget)) { CalculateWidgetDimensions(table, x, y, column_widths, row_heights, &widget->w, &widget->h); LayoutCell(table, x, y, 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)) { TXT_CAST_ARG(txt_table_t, table); txt_widget_t *widget; int i; // Check the table's current selection points at something valid before // drawing. CheckValidSelection(table); // Draw all cells for (i=0; i<table->num_widgets; ++i) { widget = table->widgets[i]; if (IsActualWidget(widget)) { TXT_GotoXY(widget->x, widget->y); TXT_DrawWidget(widget); } } } // 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 (IsActualWidget(widget)) { 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 (TXT_SelectableWidget(widget)) { ChangeSelection(table, i % table->columns, i / table->columns); } // Propagate click TXT_WidgetMousePress(widget, x, y, b); break; } } } } // Determine whether the table is selectable. static int TXT_TableSelectable(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); int i; // Is the currently-selected cell selectable? if (SelectableCell(table, table->selected_x, table->selected_y)) { return 1; } // Find the first selectable cell and set selected_x, selected_y. for (i = 0; i < table->num_widgets; ++i) { if (IsActualWidget(table->widgets[i]) && TXT_SelectableWidget(table->widgets[i])) { ChangeSelection(table, i % table->columns, i / table->columns); return 1; } } // No selectable widgets exist within the table. return 0; } // Need to pass through focus changes to the selected child widget. static void TXT_TableFocused(TXT_UNCAST_ARG(table), int focused) { TXT_CAST_ARG(txt_table_t, table); int i; i = table->selected_y * table->columns + table->selected_x; if (i < table->num_widgets) { if (IsActualWidget(table->widgets[i])) { TXT_SetWidgetFocus(table->widgets[i], focused); } } } txt_widget_class_t txt_table_class = { TXT_TableSelectable, TXT_CalcTableSize, TXT_TableDrawer, TXT_TableKeyPress, TXT_TableDestructor, TXT_TableMousePress, TXT_TableLayout, TXT_TableFocused, }; 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; } // Get the currently-selected widget in a table, recursively searching // through sub-tables if necessary. txt_widget_t *TXT_GetSelectedWidget(TXT_UNCAST_ARG(table)) { TXT_CAST_ARG(txt_table_t, table); txt_widget_t *result; int index; index = table->selected_y * table->columns + table->selected_x; result = NULL; if (index >= 0 && index < table->num_widgets) { result = table->widgets[index]; if (!IsActualWidget(result)) { result = NULL; } } if (result != NULL && result->widget_class == &txt_table_class) { result = TXT_GetSelectedWidget(result); } 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 (!IsActualWidget(table->widgets[i])) { continue; } if (table->widgets[i] == widget) { // Found the item! Select it and return. ChangeSelection(table, i % table->columns, 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. ChangeSelection(table, i % table->columns, i / table->columns); return 1; } } } // Not found. return 0; } void TXT_SetTableColumns(TXT_UNCAST_ARG(table), int new_columns) { TXT_CAST_ARG(txt_table_t, table); txt_widget_t **new_widgets; txt_widget_t *widget; int new_num_widgets; int i, j, x; // We need as many full rows as are in the current list, plus the // remainder from the last row. new_num_widgets = (table->num_widgets / table->columns) * new_columns + (table->num_widgets % table->columns); new_widgets = calloc(new_num_widgets, sizeof(txt_widget_t *)); // Reset and add one by one from the old table. new_num_widgets = 0; for (i = 0; i < table->num_widgets; ++i) { widget = table->widgets[i]; x = i % table->columns; if (x < new_columns) { new_widgets[new_num_widgets] = widget; ++new_num_widgets; } else if (IsActualWidget(widget)) { TXT_DestroyWidget(widget); } // When we reach the last column of a row, we must pad it out with // extra widgets to reach the next row. if (x == table->columns - 1) { for (j = table->columns; j < new_columns; ++j) { // First row? We need to add struts that are used to apply // the column widths. if (i < table->columns) { widget = &TXT_NewStrut(0, 0)->widget; } else { widget = &txt_table_overflow_right; } new_widgets[new_num_widgets] = widget; ++new_num_widgets; } } } free(table->widgets); table->widgets = new_widgets; table->num_widgets = new_num_widgets; table->columns = new_columns; } // 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); } // Moves the select by at least the given number of characters. // Currently quietly ignores pagex, as we don't use it. int TXT_PageTable(TXT_UNCAST_ARG(table), int pagex, int pagey) { TXT_CAST_ARG(txt_table_t, table); unsigned int *column_widths; unsigned int *row_heights; int rows; int changed = 0; rows = TableRows(table); row_heights = malloc(sizeof(int) * rows); column_widths = malloc(sizeof(int) * table->columns); CalcRowColSizes(table, row_heights, column_widths); if (pagex) { // @todo Jump selection to the left or right as needed } if (pagey) { int new_x, new_y; int distance = 0; int dir; // What direction are we moving? if (pagey > 0) { dir = 1; } else { dir = -1; } // Move the cursor until the desired distance is reached. new_y = table->selected_y; while (new_y >= 0 && new_y < rows) { // We are about to travel a distance equal to the height of the row // we are about to leave. distance += row_heights[new_y]; // *Now* increment the loop. new_y += dir; new_x = FindSelectableColumn(table, new_y, table->selected_x); if (new_x >= 0) { // Found a selectable widget in this column! // Select it anyway in case we don't find something better. ChangeSelection(table, new_x, new_y); changed = 1; // ...but is it far enough away? if (distance >= abs(pagey)) { break; } } } } free(row_heights); free(column_widths); return changed; }