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#ifndef WINDOW_H
#define WINDOW_H
#include <stddef.h>
#include <stdbool.h>
#include "text.h"
#include "ui.h"
#include "syntax.h"
typedef struct Win Win;
typedef struct {
int width; /* display width i.e. number of columns ocupied by this character */
size_t len; /* number of bytes the character displayed in this cell uses, for
character which use more than 1 column to display, their lenght
is stored in the leftmost cell wheras all following cells
occupied by the same character have a length of 0. */
char data[8]; /* utf8 encoded character displayed in this cell might not be the
the same as in the underlying text, for example tabs get expanded */
bool istab;
unsigned int attr;
} Cell;
typedef struct Line Line;
struct Line { /* a line on the screen, *not* in the file */
Line *prev, *next; /* pointer to neighbouring screen lines */
size_t len; /* line length in terms of bytes */
size_t lineno; /* line number from start of file */
int width; /* zero based position of last used column cell */
Cell cells[]; /* win->width cells storing information about the displayed characters */
};
typedef struct {
size_t line;
size_t col;
} CursorPos;
Win *window_new(Text*, UiWin*, int width, int height);
/* change associated text displayed in this window */
void window_reload(Win*, Text*);
void window_free(Win*);
/* keyboard input at cursor position */
size_t window_insert_key(Win*, const char *c, size_t len);
size_t window_replace_key(Win*, const char *c, size_t len);
size_t window_backspace_key(Win*);
size_t window_delete_key(Win*);
bool window_resize(Win*, int width, int height);
int window_height_get(Win*);
void window_draw(Win*);
/* changes how many spaces are used for one tab (must be >0), redraws the window */
void window_tabwidth_set(Win*, int tabwidth);
/* cursor movements which also update selection if one is active.
* they return new cursor postion */
size_t window_char_next(Win*);
size_t window_char_prev(Win*);
size_t window_line_down(Win*);
size_t window_line_up(Win*);
size_t window_screenline_down(Win*);
size_t window_screenline_up(Win*);
size_t window_screenline_begin(Win*);
size_t window_screenline_middle(Win*);
size_t window_screenline_end(Win*);
/* move window content up/down, but keep cursor position unchanged unless it is
* on a now invisible line in which case we try to preserve the column position */
size_t window_slide_up(Win*, int lines);
size_t window_slide_down(Win*, int lines);
/* scroll window contents up/down by lines, place the cursor on the newly
* visible line, try to preserve the column position */
size_t window_scroll_up(Win*, int lines);
size_t window_scroll_down(Win*, int lines);
/* place the cursor at the start ot the n-th window line, counting from 1 */
size_t window_screenline_goto(Win*, int n);
/* get cursor position in bytes from start of the file */
size_t window_cursor_get(Win*);
const Line *window_lines_get(Win*);
/* get cursor position in terms of screen coordinates */
CursorPos window_cursor_getpos(Win*);
/* moves window viewport in direction until pos is visible. should only be
* used for short distances between current cursor position and destination */
void window_scroll_to(Win*, size_t pos);
/* move cursor to a given position. changes the viewport to make sure that
* position is visible. if the position is in the middle of a line, try to
* adjust the viewport in such a way that the whole line is displayed */
void window_cursor_to(Win*, size_t pos);
/* redraw current cursor line at top/center/bottom of window */
void window_redraw_top(Win*);
void window_redraw_center(Win*);
void window_redraw_bottom(Win*);
/* start selected area at current cursor position. further cursor movements will
* affect the selected region. */
void window_selection_start(Win*);
/* returns the currently selected text region, is either empty or well defined,
* i.e. sel.start <= sel.end */
Filerange window_selection_get(Win*);
void window_selection_set(Win*, Filerange *sel);
/* clear selection and redraw window */
void window_selection_clear(Win*);
/* get the currently displayed area in bytes from the start of the file */
Filerange window_viewport_get(Win*);
/* associate a set of syntax highlighting rules to this window. */
void window_syntax_set(Win*, Syntax*);
Syntax *window_syntax_get(Win*);
#endif
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