ref: 10d4be9bae97006ee0b3735d3392666d74bf965c
dir: /textscreen/txt_desktop.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 <stdio.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_window.h" #define HELP_KEY KEY_F1 #define MAXWINDOWS 128 static char *desktop_title; static txt_window_t *all_windows[MAXWINDOWS]; static int num_windows = 0; static int main_loop_running = 0; static TxtIdleCallback periodic_callback = NULL; static void *periodic_callback_data; static unsigned int periodic_callback_period; void TXT_AddDesktopWindow(txt_window_t *win) { // Previously-top window loses focus: if (num_windows > 0) { TXT_SetWindowFocus(all_windows[num_windows - 1], 0); } all_windows[num_windows] = win; ++num_windows; // New window gains focus: TXT_SetWindowFocus(win, 1); } void TXT_RemoveDesktopWindow(txt_window_t *win) { int from, to; // Window must lose focus if it's being removed: TXT_SetWindowFocus(win, 0); for (from=0, to=0; from<num_windows; ++from) { if (all_windows[from] != win) { all_windows[to] = all_windows[from]; ++to; } } num_windows = to; // Top window gains focus: if (num_windows > 0) { TXT_SetWindowFocus(all_windows[num_windows - 1], 1); } } txt_window_t *TXT_GetActiveWindow(void) { if (num_windows == 0) { return NULL; } return all_windows[num_windows - 1]; } int TXT_RaiseWindow(txt_window_t *window) { int i; for (i = 0; i < num_windows - 1; ++i) { if (all_windows[i] == window) { all_windows[i] = all_windows[i + 1]; all_windows[i + 1] = window; if (i == num_windows - 2) { TXT_SetWindowFocus(all_windows[i], 0); TXT_SetWindowFocus(window, 1); } return 1; } } // Window not in the list, or at the end of the list (top) already. return 0; } int TXT_LowerWindow(txt_window_t *window) { int i; for (i = 0; i < num_windows - 1; ++i) { if (all_windows[i + 1] == window) { all_windows[i + 1] = all_windows[i]; all_windows[i] = window; if (i == num_windows - 2) { TXT_SetWindowFocus(window, 0); TXT_SetWindowFocus(all_windows[i + 1], 1); } return 1; } } // Window not in the list, or at the start of the list (bottom) already. return 0; } static void DrawDesktopBackground(const char *title) { int i; unsigned char *screendata; unsigned char *p; screendata = TXT_GetScreenData(); // Fill the screen with gradient characters p = screendata; for (i=0; i<TXT_SCREEN_W * TXT_SCREEN_H; ++i) { *p++ = 0xb1; *p++ = TXT_COLOR_GREY | (TXT_COLOR_BLUE << 4); } // Draw the top and bottom banners p = screendata; for (i=0; i<TXT_SCREEN_W; ++i) { *p++ = ' '; *p++ = TXT_COLOR_BLACK | (TXT_COLOR_GREY << 4); } p = screendata + (TXT_SCREEN_H - 1) * TXT_SCREEN_W * 2; for (i=0; i<TXT_SCREEN_W; ++i) { *p++ = ' '; *p++ = TXT_COLOR_BLACK | (TXT_COLOR_GREY << 4); } // Print the title TXT_GotoXY(0, 0); TXT_FGColor(TXT_COLOR_BLACK); TXT_BGColor(TXT_COLOR_GREY, 0); TXT_PutChar(' '); TXT_Puts(title); } static void DrawHelpIndicator(void) { char keybuf[10]; int fgcolor; int x, y; TXT_GetKeyDescription(HELP_KEY, keybuf, sizeof(keybuf)); TXT_GetMousePosition(&x, &y); if (y == 0 && x >= TXT_SCREEN_W - 9) { fgcolor = TXT_COLOR_GREY; TXT_BGColor(TXT_COLOR_BLACK, 0); } else { fgcolor = TXT_COLOR_BLACK; TXT_BGColor(TXT_COLOR_GREY, 0); } TXT_GotoXY(TXT_SCREEN_W - 9, 0); TXT_FGColor(TXT_COLOR_BRIGHT_WHITE); TXT_DrawString(" "); TXT_DrawString(keybuf); TXT_FGColor(fgcolor); TXT_DrawString("=Help "); } void TXT_SetDesktopTitle(char *title) { free(desktop_title); desktop_title = strdup(title); TXT_SetWindowTitle(title); } void TXT_DrawDesktop(void) { txt_window_t *active_window; const char *title; int i; TXT_InitClipArea(); if (desktop_title == NULL) title = ""; else title = desktop_title; DrawDesktopBackground(title); active_window = TXT_GetActiveWindow(); if (active_window != NULL && active_window->help_url != NULL) { DrawHelpIndicator(); } for (i=0; i<num_windows; ++i) { TXT_DrawWindow(all_windows[i]); } TXT_UpdateScreen(); } // Fallback function to handle key/mouse events that are not handled by // the active window. static void DesktopInputEvent(int c) { txt_window_t *active_window; int x, y; switch (c) { case TXT_MOUSE_LEFT: TXT_GetMousePosition(&x, &y); // Clicking the top-right of the screen is equivalent // to pressing the help key. if (y == 0 && x >= TXT_SCREEN_W - 9) { DesktopInputEvent(HELP_KEY); } break; case HELP_KEY: active_window = TXT_GetActiveWindow(); if (active_window != NULL) { TXT_OpenWindowHelpURL(active_window); } break; default: break; } } void TXT_DispatchEvents(void) { txt_window_t *active_window; int c; while ((c = TXT_GetChar()) > 0) { active_window = TXT_GetActiveWindow(); if (active_window != NULL && !TXT_WindowKeyPress(active_window, c)) { DesktopInputEvent(c); } } } void TXT_ExitMainLoop(void) { main_loop_running = 0; } void TXT_DrawASCIITable(void) { unsigned char *screendata; char buf[10]; int x, y; int n; screendata = TXT_GetScreenData(); TXT_FGColor(TXT_COLOR_BRIGHT_WHITE); TXT_BGColor(TXT_COLOR_BLACK, 0); for (y=0; y<16; ++y) { for (x=0; x<16; ++x) { n = y * 16 + x; TXT_GotoXY(x * 5, y); TXT_snprintf(buf, sizeof(buf), "%02x ", n); TXT_Puts(buf); // Write the character directly to the screen memory buffer: screendata[(y * TXT_SCREEN_W + x * 5 + 3) * 2] = n; } } TXT_UpdateScreen(); } void TXT_SetPeriodicCallback(TxtIdleCallback callback, void *user_data, unsigned int period) { periodic_callback = callback; periodic_callback_data = user_data; periodic_callback_period = period; } void TXT_GUIMainLoop(void) { main_loop_running = 1; while (main_loop_running) { TXT_DispatchEvents(); // After the last window is closed, exit the loop if (num_windows <= 0) { TXT_ExitMainLoop(); continue; } TXT_DrawDesktop(); // TXT_DrawASCIITable(); if (periodic_callback == NULL) { TXT_Sleep(0); } else { TXT_Sleep(periodic_callback_period); periodic_callback(periodic_callback_data); } } }