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