ref: 4f62dc3216e925731d378f2e7a5253259a34c4a1
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(const 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);
}
}
}