387 lines
7.7 KiB
C
387 lines
7.7 KiB
C
//
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// Copyright(C) 2005-2014 Simon Howard
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "doomkeys.h"
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#include "txt_desktop.h"
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#include "txt_gui.h"
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#include "txt_io.h"
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#include "txt_main.h"
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#include "txt_separator.h"
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#include "txt_window.h"
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#define HELP_KEY KEY_F1
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#define MAXWINDOWS 128
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static char *desktop_title;
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static txt_window_t *all_windows[MAXWINDOWS];
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static int num_windows = 0;
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static int main_loop_running = 0;
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static TxtIdleCallback periodic_callback = NULL;
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static void *periodic_callback_data;
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static unsigned int periodic_callback_period;
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void TXT_AddDesktopWindow(txt_window_t *win)
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{
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// Previously-top window loses focus:
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if (num_windows > 0)
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{
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TXT_SetWindowFocus(all_windows[num_windows - 1], 0);
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}
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all_windows[num_windows] = win;
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++num_windows;
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// New window gains focus:
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TXT_SetWindowFocus(win, 1);
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}
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void TXT_RemoveDesktopWindow(txt_window_t *win)
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{
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int from, to;
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// Window must lose focus if it's being removed:
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TXT_SetWindowFocus(win, 0);
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for (from=0, to=0; from<num_windows; ++from)
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{
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if (all_windows[from] != win)
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{
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all_windows[to] = all_windows[from];
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++to;
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}
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}
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num_windows = to;
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// Top window gains focus:
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if (num_windows > 0)
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{
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TXT_SetWindowFocus(all_windows[num_windows - 1], 1);
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}
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}
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txt_window_t *TXT_GetActiveWindow(void)
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{
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if (num_windows == 0)
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{
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return NULL;
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}
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return all_windows[num_windows - 1];
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}
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int TXT_RaiseWindow(txt_window_t *window)
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{
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int i;
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for (i = 0; i < num_windows - 1; ++i)
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{
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if (all_windows[i] == window)
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{
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all_windows[i] = all_windows[i + 1];
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all_windows[i + 1] = window;
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if (i == num_windows - 2)
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{
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TXT_SetWindowFocus(all_windows[i], 0);
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TXT_SetWindowFocus(window, 1);
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}
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return 1;
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}
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}
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// Window not in the list, or at the end of the list (top) already.
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return 0;
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}
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int TXT_LowerWindow(txt_window_t *window)
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{
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int i;
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for (i = 0; i < num_windows - 1; ++i)
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{
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if (all_windows[i + 1] == window)
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{
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all_windows[i + 1] = all_windows[i];
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all_windows[i] = window;
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if (i == num_windows - 2)
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{
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TXT_SetWindowFocus(window, 0);
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TXT_SetWindowFocus(all_windows[i + 1], 1);
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}
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return 1;
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}
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}
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// Window not in the list, or at the start of the list (bottom) already.
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return 0;
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}
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static void DrawDesktopBackground(const char *title)
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{
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int i;
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unsigned char *screendata;
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unsigned char *p;
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screendata = TXT_GetScreenData();
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// Fill the screen with gradient characters
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p = screendata;
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for (i=0; i<TXT_SCREEN_W * TXT_SCREEN_H; ++i)
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{
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*p++ = 0xb1;
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*p++ = TXT_COLOR_GREY | (TXT_COLOR_BLUE << 4);
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}
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// Draw the top and bottom banners
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p = screendata;
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for (i=0; i<TXT_SCREEN_W; ++i)
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{
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*p++ = ' ';
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*p++ = TXT_COLOR_BLACK | (TXT_COLOR_GREY << 4);
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}
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p = screendata + (TXT_SCREEN_H - 1) * TXT_SCREEN_W * 2;
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for (i=0; i<TXT_SCREEN_W; ++i)
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{
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*p++ = ' ';
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*p++ = TXT_COLOR_BLACK | (TXT_COLOR_GREY << 4);
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}
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// Print the title
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TXT_GotoXY(0, 0);
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TXT_FGColor(TXT_COLOR_BLACK);
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TXT_BGColor(TXT_COLOR_GREY, 0);
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TXT_PutChar(' ');
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TXT_Puts(title);
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}
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static void DrawHelpIndicator(void)
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{
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char keybuf[10];
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int fgcolor;
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int x, y;
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TXT_GetKeyDescription(HELP_KEY, keybuf, sizeof(keybuf));
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TXT_GetMousePosition(&x, &y);
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if (y == 0 && x >= TXT_SCREEN_W - 9)
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{
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fgcolor = TXT_COLOR_GREY;
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TXT_BGColor(TXT_COLOR_BLACK, 0);
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}
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else
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{
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fgcolor = TXT_COLOR_BLACK;
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TXT_BGColor(TXT_COLOR_GREY, 0);
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}
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TXT_GotoXY(TXT_SCREEN_W - 9, 0);
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TXT_FGColor(TXT_COLOR_BRIGHT_WHITE);
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TXT_DrawString(" ");
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TXT_DrawString(keybuf);
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TXT_FGColor(fgcolor);
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TXT_DrawString("=Help ");
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}
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void TXT_SetDesktopTitle(char *title)
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{
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free(desktop_title);
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desktop_title = strdup(title);
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TXT_SetWindowTitle(title);
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}
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void TXT_DrawDesktop(void)
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{
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txt_window_t *active_window;
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const char *title;
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int i;
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TXT_InitClipArea();
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if (desktop_title == NULL)
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title = "";
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else
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title = desktop_title;
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DrawDesktopBackground(title);
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active_window = TXT_GetActiveWindow();
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if (active_window != NULL && active_window->help_url != NULL)
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{
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DrawHelpIndicator();
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}
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for (i=0; i<num_windows; ++i)
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{
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TXT_DrawWindow(all_windows[i]);
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}
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TXT_UpdateScreen();
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}
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// Fallback function to handle key/mouse events that are not handled by
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// the active window.
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static void DesktopInputEvent(int c)
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{
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txt_window_t *active_window;
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int x, y;
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switch (c)
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{
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case TXT_MOUSE_LEFT:
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TXT_GetMousePosition(&x, &y);
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// Clicking the top-right of the screen is equivalent
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// to pressing the help key.
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if (y == 0 && x >= TXT_SCREEN_W - 9)
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{
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DesktopInputEvent(HELP_KEY);
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}
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break;
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case HELP_KEY:
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active_window = TXT_GetActiveWindow();
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if (active_window != NULL)
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{
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TXT_OpenWindowHelpURL(active_window);
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}
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break;
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default:
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break;
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}
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}
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void TXT_DispatchEvents(void)
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{
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txt_window_t *active_window;
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int c;
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while ((c = TXT_GetChar()) > 0)
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{
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active_window = TXT_GetActiveWindow();
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if (active_window != NULL && !TXT_WindowKeyPress(active_window, c))
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{
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DesktopInputEvent(c);
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}
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}
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}
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void TXT_ExitMainLoop(void)
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{
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main_loop_running = 0;
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}
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void TXT_DrawASCIITable(void)
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{
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unsigned char *screendata;
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char buf[10];
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int x, y;
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int n;
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screendata = TXT_GetScreenData();
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TXT_FGColor(TXT_COLOR_BRIGHT_WHITE);
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TXT_BGColor(TXT_COLOR_BLACK, 0);
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for (y=0; y<16; ++y)
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{
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for (x=0; x<16; ++x)
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{
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n = y * 16 + x;
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TXT_GotoXY(x * 5, y);
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TXT_snprintf(buf, sizeof(buf), "%02x ", n);
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TXT_Puts(buf);
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// Write the character directly to the screen memory buffer:
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screendata[(y * TXT_SCREEN_W + x * 5 + 3) * 2] = n;
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}
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}
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TXT_UpdateScreen();
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}
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void TXT_SetPeriodicCallback(TxtIdleCallback callback,
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void *user_data,
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unsigned int period)
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{
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periodic_callback = callback;
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periodic_callback_data = user_data;
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periodic_callback_period = period;
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}
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void TXT_GUIMainLoop(void)
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{
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main_loop_running = 1;
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while (main_loop_running)
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{
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TXT_DispatchEvents();
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// After the last window is closed, exit the loop
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if (num_windows <= 0)
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{
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TXT_ExitMainLoop();
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continue;
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}
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TXT_DrawDesktop();
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// TXT_DrawASCIITable();
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if (periodic_callback == NULL)
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{
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TXT_Sleep(0);
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}
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else
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{
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TXT_Sleep(periodic_callback_period);
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periodic_callback(periodic_callback_data);
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}
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}
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}
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