Category : Files from Magazines
Archive : PJ95.ZIP
Filename : WINDOW.C
Output of file : WINDOW.C contained in archive : PJ95.ZIP
#include
#include
#include
#include
void wputc( win *w, int c ); /* Test function in wputc.c */
/*============================================================*/
#include
#include
/*------------------------------------------------------------*/
static int Instance_count = 0;
win *w_construct( int win_height, int win_width )
{
win *w;
if( !(w = malloc(sizeof(win)) ) )
return NULL;
if( ++Instance_count == 1 ) /* Creating first window */
{
v_startup( C4350 ); /* Start up video system. */
}
w->row_off = 0; /* viewport in upper left corner of */
w->col_off = 0; /* of the buffer. */
w->file_off = 0; /* No lines above window in file */
w->bottom = -1; /* No lines read yet */
w->import = NULL; /* No overflow file by default. */
w->export = NULL;
w->remove = NULL;
w->insert = NULL;
w->engine_active = 0; /* engine not initialized */
w->update = 0; /* updating is disabled */
w->update_row_off = 0; /* when updating is enabled, */
w->update_col_off = 0; /* set cursor to top left of */
w->update_file_off = 0; /* viewport, buffer, and file. */
w->update_row = 0;
w->update_col = 0;
w->dirty = 0;
/* Create text buffer and viewport */
b_construct ( &w->b, win_height, win_width );
v_construct ( &w->v );
v_saveok ( &w->v, 1 );
v_clearok ( &w->v, 1 );
v_size ( &w->v, win_height, win_width );
v_foreground ( &w->v, BLACK );
v_background ( &w->v, LIGHTGRAY );
return w;
}
void w_destroy( win *w ) /* destroy the window */
{
v_destroy (&w->v); /* destroy the viewport */
b_destruct (&w->b); /* destroy the text buffer */
free( w ); /* Free the space for the window */
e_close( w ); /* Flush buffer to underlying file */
engine_close( w ); /* Shut down the editor. */
if( --Instance_count == 0 ) /* Destroyed the last window. */
{
v_shutdown ( ); /* Shut down the video system. */
}
}
/*------------------------------------------------------------*/
void w_open( win *w )
{
v_open ( &w->v ); /* Display the viewport */
e_update( w, 1 ); /* Enable writes to the window */
/* and position cursor at (0,0) */
if( !w->engine_active ) /* Edit engine is uninitialized. */
{
e_open( w ); /* Initialize buffer */
engine_open( w ); /* Initialize edit engine. */
w->engine_active = 1; /* Mark it as initialized. */
}
}
void w_hide( win *w )
{
e_update( w, 0 ); /* Disable viewport updating. */
v_deactivate( &w->v, 1 );
}
/*------------------------------------------------------------*/
void w_viewsize( win *w, int view_height, int view_width )
{
v_size( &w->v, view_height, view_width );
}
void w_viewcolor( win *w, int foreground, int background )
{
v_foreground ( &w->v, foreground );
v_background ( &w->v, background );
}
void w_move_rel( win *w, int delta_row, int delta_col )
{
/* Move delta_row rows down and delta_col columns to the right
* I'm assuming that the window's hidden if updating is off.
* This might not be the case, though. If this assumption
* causes problems, add a "hidden" attribute to the either
* the viewport structure (preferable) or the win structure
* (less preferable, but it will work). If you do the former,
* provide a v_visible() that evaluates true if the viewport
* is visible.
*/
if( !w->update )
v_move_rel( &w->v, -delta_row, -delta_col );
if( w->update )
{
w_hide( w );
v_move_rel( &w->v, -delta_row, -delta_col );
w_open( w );
}
}
void w_move( win *w, int row, int col )
{
/* Move delta_row rows down and delta_col columns to right */
if( !w->update )
v_move( &w->v, row, col );
else
{
w_hide( w );
v_move( &w->v, row, col );
w_open( w );
}
}
void w_file( win *w,
char *(*import)( win *this, int lnum ),
int (*insert)( win *this, int lnum ),
void (*export)( win *this, int lnum, char *line, int nc,
int len ),
void (*remove)( win *this, int lnum, char *line, int nc,
int len )
)
{
/* Attach file-level support to the window functions. */
w->import = import;
w->insert = insert;
w->export = export;
w->remove = remove;
}
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