ref: 670212f2ee7c468790c3e3b351b45135c274ef9c
dir: /textscreen/txt_gui.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 <stdlib.h>
#include <string.h>
#include "txt_gui.h"
#include "txt_io.h"
#include "txt_main.h"
#include "txt_utf8.h"
typedef struct txt_cliparea_s txt_cliparea_t;
struct txt_cliparea_s
{
int x1, x2;
int y1, y2;
txt_cliparea_t *next;
};
// Array of border characters for drawing windows. The array looks like this:
//
// +-++
// | ||
// +-++
// +-++
static const int borders[4][4] =
{
{0xda, 0xc4, 0xc2, 0xbf},
{0xb3, ' ', 0xb3, 0xb3},
{0xc3, 0xc4, 0xc5, 0xb4},
{0xc0, 0xc4, 0xc1, 0xd9},
};
static txt_cliparea_t *cliparea = NULL;
#define VALID_X(x) ((x) >= cliparea->x1 && (x) < cliparea->x2)
#define VALID_Y(y) ((y) >= cliparea->y1 && (y) < cliparea->y2)
void TXT_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_DrawString(" ");
TXT_DrawString(title);
}
void TXT_DrawShadow(int x, int y, int w, int h)
{
unsigned char *screendata;
unsigned char *p;
int x1, y1;
screendata = TXT_GetScreenData();
for (y1=y; y1<y+h; ++y1)
{
p = screendata + (y1 * TXT_SCREEN_W + x) * 2;
for (x1=x; x1<x+w; ++x1)
{
if (VALID_X(x1) && VALID_Y(y1))
{
p[1] = TXT_COLOR_DARK_GREY;
}
p += 2;
}
}
}
void TXT_DrawWindowFrame(const char *title, int x, int y, int w, int h)
{
txt_saved_colors_t colors;
int x1, y1;
int bx, by;
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BRIGHT_CYAN);
for (y1=y; y1<y+h; ++y1)
{
// Select the appropriate row and column in the borders
// array to pick the appropriate character to draw at
// this location.
//
// Draw a horizontal line on the third line down, so we
// draw a box around the title.
by = y1 == y ? 0 :
y1 == y + 2 && title != NULL ? 2 :
y1 == y + h - 1 ? 3 : 1;
for (x1=x; x1<x+w; ++x1)
{
bx = x1 == x ? 0 :
x1 == x + w - 1 ? 3 : 1;
if (VALID_X(x1) && VALID_Y(y1))
{
TXT_GotoXY(x1, y1);
TXT_PutChar(borders[by][bx]);
}
}
}
// Draw the title
if (title != NULL)
{
TXT_GotoXY(x + 1, y + 1);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_FGColor(TXT_COLOR_BLUE);
for (x1=0; x1<w-2; ++x1)
{
TXT_DrawString(" ");
}
TXT_GotoXY(x + (w - TXT_UTF8_Strlen(title)) / 2, y + 1);
TXT_DrawString(title);
}
// Draw the window's shadow.
TXT_DrawShadow(x + 2, y + h, w, 1);
TXT_DrawShadow(x + w, y + 1, 2, h);
TXT_RestoreColors(&colors);
}
void TXT_DrawSeparator(int x, int y, int w)
{
txt_saved_colors_t colors;
unsigned char *data;
int x1;
int b;
data = TXT_GetScreenData();
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BRIGHT_CYAN);
if (!VALID_Y(y))
{
return;
}
data += (y * TXT_SCREEN_W + x) * 2;
for (x1=x; x1<x+w; ++x1)
{
TXT_GotoXY(x1, y);
b = x1 == x ? 0 :
x1 == x + w - 1 ? 3 :
1;
if (VALID_X(x1))
{
// Read the current value from the screen
// Check that it matches what the window should look like if
// there is no separator, then apply the separator
if (*data == borders[1][b])
{
TXT_PutChar(borders[2][b]);
}
}
data += 2;
}
TXT_RestoreColors(&colors);
}
// Alternative to TXT_DrawString() where the argument is a "code page
// string" - characters are in native code page format and not UTF-8.
void TXT_DrawCodePageString(const char *s)
{
int x, y;
int x1;
const char *p;
TXT_GetXY(&x, &y);
if (VALID_Y(y))
{
x1 = x;
for (p = s; *p != '\0'; ++p)
{
if (VALID_X(x1))
{
TXT_GotoXY(x1, y);
TXT_PutChar(*p);
}
x1 += 1;
}
}
TXT_GotoXY(x + strlen(s), y);
}
static void PutUnicodeChar(unsigned int c)
{
int d;
// Treat control characters specially.
if (c == '\n' || c == '\b')
{
TXT_PutChar(c);
return;
}
// Map Unicode character into the symbol used to represent it in this
// code page. For unrepresentable characters, print a fallback instead.
// Note that we use TXT_PutSymbol() here because we just want to do a
// raw write into the screen buffer.
d = TXT_UnicodeCharacter(c);
if (d >= 0)
{
TXT_PutSymbol(d);
}
else
{
TXT_PutSymbol('\xa8');
}
}
void TXT_DrawString(const char *s)
{
int x, y;
int x1;
const char *p;
unsigned int c;
TXT_GetXY(&x, &y);
if (VALID_Y(y))
{
x1 = x;
for (p = s; *p != '\0'; )
{
c = TXT_DecodeUTF8(&p);
if (c == 0)
{
break;
}
if (VALID_X(x1))
{
TXT_GotoXY(x1, y);
PutUnicodeChar(c);
}
x1 += 1;
}
}
TXT_GotoXY(x + TXT_UTF8_Strlen(s), y);
}
void TXT_DrawHorizScrollbar(int x, int y, int w, int cursor, int range)
{
txt_saved_colors_t colors;
int x1;
int cursor_x;
if (!VALID_Y(y))
{
return;
}
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BLACK);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_GotoXY(x, y);
TXT_PutChar('\x1b');
cursor_x = x + 1;
if (range > 0)
{
cursor_x += (cursor * (w - 3)) / range;
}
if (cursor_x > x + w - 2)
{
cursor_x = x + w - 2;
}
for (x1=x+1; x1<x+w-1; ++x1)
{
if (VALID_X(x1))
{
if (x1 == cursor_x)
{
TXT_PutChar('\xdb');
}
else
{
TXT_PutChar('\xb1');
}
}
}
TXT_PutChar('\x1a');
TXT_RestoreColors(&colors);
}
void TXT_DrawVertScrollbar(int x, int y, int h, int cursor, int range)
{
txt_saved_colors_t colors;
int y1;
int cursor_y;
if (!VALID_X(x))
{
return;
}
TXT_SaveColors(&colors);
TXT_FGColor(TXT_COLOR_BLACK);
TXT_BGColor(TXT_COLOR_GREY, 0);
TXT_GotoXY(x, y);
TXT_PutChar('\x18');
cursor_y = y + 1;
if (cursor_y > y + h - 2)
{
cursor_y = y + h - 2;
}
if (range > 0)
{
cursor_y += (cursor * (h - 3)) / range;
}
for (y1=y+1; y1<y+h-1; ++y1)
{
if (VALID_Y(y1))
{
TXT_GotoXY(x, y1);
if (y1 == cursor_y)
{
TXT_PutChar('\xdb');
}
else
{
TXT_PutChar('\xb1');
}
}
}
TXT_GotoXY(x, y + h - 1);
TXT_PutChar('\x19');
TXT_RestoreColors(&colors);
}
void TXT_InitClipArea(void)
{
if (cliparea == NULL)
{
cliparea = malloc(sizeof(txt_cliparea_t));
cliparea->x1 = 0;
cliparea->x2 = TXT_SCREEN_W;
cliparea->y1 = 0;
cliparea->y2 = TXT_SCREEN_H;
cliparea->next = NULL;
}
}
void TXT_PushClipArea(int x1, int x2, int y1, int y2)
{
txt_cliparea_t *newarea;
newarea = malloc(sizeof(txt_cliparea_t));
// Set the new clip area to the intersection of the old
// area and the new one.
newarea->x1 = cliparea->x1;
newarea->x2 = cliparea->x2;
newarea->y1 = cliparea->y1;
newarea->y2 = cliparea->y2;
if (x1 > newarea->x1)
newarea->x1 = x1;
if (x2 < newarea->x2)
newarea->x2 = x2;
if (y1 > newarea->y1)
newarea->y1 = y1;
if (y2 < newarea->y2)
newarea->y2 = y2;
#if 0
printf("New scrollable area: %i,%i-%i,%i\n", x1, y1, x2, y2);
#endif
// Hook into the list
newarea->next = cliparea;
cliparea = newarea;
}
void TXT_PopClipArea(void)
{
txt_cliparea_t *next_cliparea;
// Never pop the last entry
if (cliparea->next == NULL)
return;
// Unlink the last entry and delete
next_cliparea = cliparea->next;
free(cliparea);
cliparea = next_cliparea;
}