ref: 2fd49a65afdcadbc09680552142c6f107715ebbc
parent: fe1a0afdd7acec6705ccf0ada6b51eae9aae2870
author: Simon Howard <[email protected]>
date: Thu Aug 31 14:12:05 EDT 2006
Add dropdown listbox widget Subversion-branch: /trunk/chocolate-doom Subversion-revision: 578
--- a/textscreen/Makefile.am
+++ b/textscreen/Makefile.am
@@ -11,6 +11,7 @@
textscreen.h \
txt_checkbox.c txt_checkbox.h \
txt_desktop.c txt_desktop.h \
+ txt_dropdown.c txt_dropdown.h \
txt_gui.c txt_gui.h \
txt_inputbox.c txt_inputbox.h \
txt_io.c txt_io.h \
--- a/textscreen/textscreen.h
+++ b/textscreen/textscreen.h
@@ -31,6 +31,7 @@
#include "txt_button.h"
#include "txt_checkbox.h"
#include "txt_desktop.h"
+#include "txt_dropdown.h"
#include "txt_inputbox.h"
#include "txt_label.h"
#include "txt_radiobutton.h"
--- /dev/null
+++ b/textscreen/txt_dropdown.c
@@ -1,0 +1,263 @@
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "doomkeys.h"
+
+#include "txt_button.h"
+#include "txt_dropdown.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)
+{+ if (ValidSelection(list))
+ {+ return list->widget.y - 1 - *list->variable;
+ }
+ else
+ {+ return list->widget.y - 1 - (list->num_values / 2);
+ }
+}
+
+// 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;
+
+ // 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;
+}
+
+// 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);
+}
+
+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), int selected)
+{+ TXT_CAST_ARG(txt_dropdown_list_t, list);
+ int i;
+ char *str;
+
+ // Set bg/fg text colors.
+
+ if (selected)
+ {+ TXT_BGColor(TXT_COLOR_GREY, 0);
+ }
+ else
+ {+ TXT_BGColor(TXT_COLOR_BLUE, 0);
+ }
+
+ TXT_FGColor(TXT_COLOR_BRIGHT_WHITE);
+
+ // 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_DropdownListSizeCalc,
+ TXT_DropdownListDrawer,
+ TXT_DropdownListKeyPress,
+ TXT_DropdownListDestructor,
+ TXT_DropdownListMousePress,
+};
+
+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;
+}
+
--- /dev/null
+++ b/textscreen/txt_dropdown.h
@@ -1,0 +1,49 @@
+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// $Id$
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// 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.
+//
+
+#ifndef TXT_DROPDOWN_H
+#define TXT_DROPDOWN_H
+
+typedef struct txt_dropdown_list_s txt_dropdown_list_t;
+
+#include "txt_widget.h"
+
+//
+// Drop-down list box.
+//
+
+struct txt_dropdown_list_s
+{+ txt_widget_t widget;
+ int *variable;
+ char **values;
+ int num_values;
+};
+
+txt_dropdown_list_t *TXT_NewDropdownList(int *variable,
+ char **values, int num_values);
+
+#endif /* #ifndef TXT_DROPDOWN_H */
+
+