ref: 05f22d03aa25c55f5b7251d474eee16054f37e9e
dir: /textscreen/txt_dropdown.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 <stdlib.h> #include <string.h> #include "doomkeys.h" #include "txt_button.h" #include "txt_dropdown.h" #include "txt_gui.h" #include "txt_io.h" #include "txt_main.h" #include "txt_window.h" typedef struct { txt_window_t *window; txt_dropdown_list_t *list; int item; } callback_data_t; // Check if the selected value for a list is valid static int ValidSelection(txt_dropdown_list_t *list) { return *list->variable >= 0 && *list->variable < list->num_values; } // Calculate the Y position for the selector window static int SelectorWindowY(txt_dropdown_list_t *list) { int result; if (ValidSelection(list)) { result = list->widget.y - 1 - *list->variable; } else { result = list->widget.y - 1 - (list->num_values / 2); } // Keep dropdown inside the screen. if (result < 1) { result = 1; } else if (result + list->num_values > (TXT_SCREEN_H - 3)) { result = TXT_SCREEN_H - list->num_values - 3; } return result; } // Called when a button in the selector window is pressed static void ItemSelected(TXT_UNCAST_ARG(button), TXT_UNCAST_ARG(callback_data)) { TXT_CAST_ARG(callback_data_t, callback_data); // Set the variable *callback_data->list->variable = callback_data->item; TXT_EmitSignal(callback_data->list, "changed"); // Close the window TXT_CloseWindow(callback_data->window); } // Free callback data when the window is closed static void FreeCallbackData(TXT_UNCAST_ARG(list), TXT_UNCAST_ARG(callback_data)) { TXT_CAST_ARG(callback_data_t, callback_data); free(callback_data); } // Catch presses of escape and close the window. static int SelectorWindowListener(txt_window_t *window, int key, void *user_data) { if (key == KEY_ESCAPE) { TXT_CloseWindow(window); return 1; } return 0; } static int SelectorMouseListener(txt_window_t *window, int x, int y, int b, void *unused) { txt_widget_t *win; win = (txt_widget_t *) window; if (x < win->x || x > win->x + win->w || y < win->y || y > win->y + win->h) { TXT_CloseWindow(window); return 1; } return 0; } // Open the dropdown list window to select an item static void OpenSelectorWindow(txt_dropdown_list_t *list) { txt_window_t *window; int i; // Open a simple window with no title bar or action buttons. window = TXT_NewWindow(NULL); TXT_SetWindowAction(window, TXT_HORIZ_LEFT, NULL); TXT_SetWindowAction(window, TXT_HORIZ_CENTER, NULL); TXT_SetWindowAction(window, TXT_HORIZ_RIGHT, NULL); // Position the window so that the currently selected item appears // over the top of the list widget. TXT_SetWindowPosition(window, TXT_HORIZ_LEFT, TXT_VERT_TOP, list->widget.x - 2, SelectorWindowY(list)); // Add a button to the window for each option in the list. for (i=0; i<list->num_values; ++i) { txt_button_t *button; callback_data_t *data; button = TXT_NewButton(list->values[i]); TXT_AddWidget(window, button); // Callback struct data = malloc(sizeof(callback_data_t)); data->list = list; data->window = window; data->item = i; // When the button is pressed, invoke the button press callback TXT_SignalConnect(button, "pressed", ItemSelected, data); // When the window is closed, free back the callback struct TXT_SignalConnect(window, "closed", FreeCallbackData, data); // Is this the currently-selected value? If so, select the button // in the window as the default. if (i == *list->variable) { TXT_SelectWidget(window, button); } } // Catch presses of escape in this window and close it. TXT_SetKeyListener(window, SelectorWindowListener, NULL); TXT_SetMouseListener(window, SelectorMouseListener, NULL); } static int DropdownListWidth(txt_dropdown_list_t *list) { int i; int result; // Find the maximum string width result = 0; for (i=0; i<list->num_values; ++i) { int w = strlen(list->values[i]); if (w > result) { result = w; } } return result; } static void TXT_DropdownListSizeCalc(TXT_UNCAST_ARG(list)) { TXT_CAST_ARG(txt_dropdown_list_t, list); list->widget.w = DropdownListWidth(list); list->widget.h = 1; } static void TXT_DropdownListDrawer(TXT_UNCAST_ARG(list)) { TXT_CAST_ARG(txt_dropdown_list_t, list); unsigned int i; const char *str; // Set bg/fg text colors. TXT_SetWidgetBG(list); // Select a string to draw from the list, if the current value is // in range. Otherwise fall back to a default. if (ValidSelection(list)) { str = list->values[*list->variable]; } else { str = "???"; } // Draw the string and fill to the end with spaces TXT_DrawString(str); for (i=strlen(str); i<list->widget.w; ++i) { TXT_DrawString(" "); } } static void TXT_DropdownListDestructor(TXT_UNCAST_ARG(list)) { } static int TXT_DropdownListKeyPress(TXT_UNCAST_ARG(list), int key) { TXT_CAST_ARG(txt_dropdown_list_t, list); if (key == KEY_ENTER) { OpenSelectorWindow(list); return 1; } return 0; } static void TXT_DropdownListMousePress(TXT_UNCAST_ARG(list), int x, int y, int b) { TXT_CAST_ARG(txt_dropdown_list_t, list); // Left mouse click does the same as selecting and pressing enter if (b == TXT_MOUSE_LEFT) { TXT_DropdownListKeyPress(list, KEY_ENTER); } } txt_widget_class_t txt_dropdown_list_class = { TXT_AlwaysSelectable, TXT_DropdownListSizeCalc, TXT_DropdownListDrawer, TXT_DropdownListKeyPress, TXT_DropdownListDestructor, TXT_DropdownListMousePress, NULL, }; txt_dropdown_list_t *TXT_NewDropdownList(int *variable, char **values, int num_values) { txt_dropdown_list_t *list; list = malloc(sizeof(txt_dropdown_list_t)); TXT_InitWidget(list, &txt_dropdown_list_class); list->variable = variable; list->values = values; list->num_values = num_values; return list; }