Category : C Source Code
Archive : WINDOW_C.ZIP
Filename : W_OPEN.C
Output of file : W_OPEN.C contained in archive : WINDOW_C.ZIP
#define NDEBUG
#include
#include
#include
#include
#include
#include "windows.h"
/*
** w_open() -- opens a window and displays it as the top window
** passed: pointer to window structure
** calls: w_select(), w_link(), w_draw()
** notes: make sure you have created the memory for the
** window with w_create before you call this function;
** if the window is already open, it is moved to the top;
** otherwise it is added to the linked list at the top &
** displayed
*/
void w_open(w)
Window *w;
{
if (w->open)
w_select(w);
else {
w_link(w);
w_draw(w);
}
}
/*
** w_link() -- adds window pointer to top of linked list
** passed: pointer to window structure
** sets: layers_w, top_w, members of window structure
** notes: this function is called as part of the routine to
** open a window; to move to the top a window which is
** already open call w_select()
*/
void w_link(w)
Window *w;
{
top_w->next = w;
w->prev = top_w;
top_w = w;
w->next = NULL;
layers_w++;
w->open = 1;
}
/*
** w_select() -- moves to the top position a window which is already open
** passed: pointer to window structure
** calls: w_draw(), assert()
** uses: main_w, top_w
** sets: members of window structure in linked list
** notes: this routine assumes that the window is open; a check on
** this assumption is made with assert(); no action is
** taken if the window is already on top, or if it is the
** main window
*/
void w_select(w)
Window *w;
{
assert(w->open);
if (w == main_w || w == top_w)
return;
w->prev->next = w->next;
w->next->prev = w->prev;
w->prev = top_w;
top_w->next = w;
top_w = w;
w->next = NULL;
w_draw(w);
}
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