wine/server/window.c

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/*
* Server-side window handling
*
* Copyright (C) 2001 Alexandre Julliard
*/
#include <assert.h>
#include "object.h"
#include "request.h"
#include "thread.h"
#include "process.h"
#include "user.h"
struct window
{
struct window *parent; /* parent window */
struct window *child; /* first child window */
struct window *next; /* next window in Z-order */
struct window *prev; /* prev window in Z-order */
user_handle_t handle; /* full handle for this window */
struct thread *thread; /* thread owning the window */
};
static struct window *top_window; /* top-level (desktop) window */
/* link a window into the tree (or unlink it if the new parent is NULL) */
static void link_window( struct window *win, struct window *parent, struct window *previous )
{
if (win->parent) /* unlink it from the previous location */
{
if (win->next) win->next->prev = win->prev;
if (win->prev) win->prev->next = win->next;
else win->parent->child = win->next;
}
if ((win->parent = parent))
{
if ((win->prev = previous))
{
if ((win->next = previous->next)) win->next->prev = win;
win->prev->next = win;
}
else
{
if ((win->next = parent->child)) win->next->prev = win;
parent->child = win;
}
}
else win->next = win->prev = NULL;
}
/* free a window structure */
static void free_window( struct window *win )
{
assert( win != top_window );
while (win->child) free_window( win->child );
if (win->thread->queue) queue_cleanup_window( win->thread, win->handle );
free_user_handle( win->handle );
if (win->parent) link_window( win, NULL, NULL );
memset( win, 0x55, sizeof(*win) );
free( win );
}
/* create a new window structure */
static struct window *create_window(void)
{
struct window *win = mem_alloc( sizeof(*win) );
if (!win) return NULL;
if (!(win->handle = alloc_user_handle( win, USER_WINDOW )))
{
free( win );
return NULL;
}
win->parent = NULL;
win->child = NULL;
win->next = NULL;
win->prev = NULL;
win->thread = current;
return win;
}
/* destroy all windows belonging to a given thread */
void destroy_thread_windows( struct thread *thread )
{
user_handle_t handle = 0;
struct window *win;
while ((win = next_user_handle( &handle, USER_WINDOW )))
{
if (win->thread != thread) continue;
free_window( win );
}
}
/* create a window */
DECL_HANDLER(create_window)
{
struct window *win;
req->handle = 0;
if ((win = create_window())) req->handle = win->handle;
}
/* create the desktop window */
DECL_HANDLER(create_desktop_window)
{
req->handle = 0;
if (!top_window)
{
if (!(top_window = create_window())) return;
top_window->thread = NULL; /* no thread owns the desktop */
}
req->handle = top_window->handle;
}
/* link a window into the tree */
DECL_HANDLER(link_window)
{
struct window *win, *parent = NULL, *previous = NULL;
if (!(win = get_user_object( req->handle, USER_WINDOW ))) return;
if (req->parent && !(parent = get_user_object( req->parent, USER_WINDOW ))) return;
if (parent && req->previous)
{
if (req->previous == 1) /* special case: HWND_BOTTOM */
{
if ((previous = parent->child))
{
/* make it the last of the list */
while (previous->next) previous = previous->next;
}
}
else if (!(previous = get_user_object( req->previous, USER_WINDOW ))) return;
if (previous && previous->parent != parent) /* previous must be a child of parent */
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
}
link_window( win, parent, previous );
}
/* destroy a window */
DECL_HANDLER(destroy_window)
{
struct window *win = get_user_object( req->handle, USER_WINDOW );
if (win)
{
if (win != top_window) free_window( win );
else set_error( STATUS_ACCESS_DENIED );
}
}
/* Get information from a window handle */
DECL_HANDLER(get_window_info)
{
user_handle_t handle = req->handle;
struct window *win = get_user_object_handle( &handle, USER_WINDOW );
req->full_handle = 0;
req->tid = req->pid = 0;
if (win)
{
req->full_handle = handle;
if (win->thread)
{
req->tid = get_thread_id( win->thread );
req->pid = get_process_id( win->thread->process );
}
}
}