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Sweden-Number/server/window.c

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/*
* Server-side window handling
*
* Copyright (C) 2001 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <assert.h>
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "object.h"
#include "request.h"
#include "thread.h"
#include "process.h"
#include "user.h"
#include "unicode.h"
/* a window property */
struct property
{
unsigned short type; /* property type (see below) */
atom_t atom; /* property atom */
handle_t handle; /* property handle (user-defined storage) */
};
enum property_type
{
PROP_TYPE_FREE, /* free entry */
PROP_TYPE_STRING, /* atom that was originally a string */
PROP_TYPE_ATOM /* plain atom */
};
struct window
{
struct window *parent; /* parent window */
struct window *owner; /* owner of this window */
struct window *first_child; /* first child in Z-order */
struct window *last_child; /* last child in Z-order */
struct window *first_unlinked; /* first child not linked in the Z-order list */
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 */
atom_t atom; /* class atom */
rectangle_t window_rect; /* window rectangle */
rectangle_t client_rect; /* client rectangle */
unsigned int style; /* window style */
unsigned int ex_style; /* window extended style */
unsigned int id; /* window id */
void* instance; /* creator instance */
void* user_data; /* user-specific data */
WCHAR *text; /* window caption text */
int paint_count; /* count of pending paints for this window */
int prop_inuse; /* number of in-use window properties */
int prop_alloc; /* number of allocated window properties */
struct property *properties; /* window properties array */
};
static struct window *top_window; /* top-level (desktop) window */
/* retrieve a pointer to a window from its handle */
inline static struct window *get_window( user_handle_t handle )
{
struct window *ret = get_user_object( handle, USER_WINDOW );
if (!ret) set_error( STATUS_INVALID_HANDLE );
return ret;
}
/* unlink a window from the tree */
static void unlink_window( struct window *win )
{
struct window *parent = win->parent;
assert( parent );
if (win->next) win->next->prev = win->prev;
else if (parent->last_child == win) parent->last_child = win->prev;
if (win->prev) win->prev->next = win->next;
else if (parent->first_child == win) parent->first_child = win->next;
else if (parent->first_unlinked == win) parent->first_unlinked = win->next;
}
/* 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 )
{
unlink_window( win ); /* unlink it from the previous location */
if (parent)
{
if (win->parent != parent)
{
win->owner = NULL; /* reset owner if changing parent */
win->parent = parent;
}
if ((win->prev = previous))
{
if ((win->next = previous->next)) win->next->prev = win;
else if (win->parent->last_child == previous) win->parent->last_child = win;
win->prev->next = win;
}
else
{
if ((win->next = parent->first_child)) win->next->prev = win;
else win->parent->last_child = win;
parent->first_child = win;
}
}
else /* move it to parent unlinked list */
{
parent = win->parent;
if ((win->next = parent->first_unlinked)) win->next->prev = win;
win->prev = NULL;
parent->first_unlinked = win;
}
}
/* set a window property */
static void set_property( struct window *win, atom_t atom, handle_t handle,
enum property_type type )
{
int i, free = -1;
struct property *new_props;
/* check if it exists already */
for (i = 0; i < win->prop_inuse; i++)
{
if (win->properties[i].type == PROP_TYPE_FREE)
{
free = i;
continue;
}
if (win->properties[i].atom == atom)
{
win->properties[i].type = type;
win->properties[i].handle = handle;
return;
}
}
/* need to add an entry */
if (!grab_global_atom( atom )) return;
if (free == -1)
{
/* no free entry */
if (win->prop_inuse >= win->prop_alloc)
{
/* need to grow the array */
if (!(new_props = realloc( win->properties,
sizeof(*new_props) * (win->prop_alloc + 16) )))
{
set_error( STATUS_NO_MEMORY );
release_global_atom( atom );
return;
}
win->prop_alloc += 16;
win->properties = new_props;
}
free = win->prop_inuse++;
}
win->properties[free].atom = atom;
win->properties[free].type = type;
win->properties[free].handle = handle;
}
/* remove a window property */
static handle_t remove_property( struct window *win, atom_t atom )
{
int i;
for (i = 0; i < win->prop_inuse; i++)
{
if (win->properties[i].type == PROP_TYPE_FREE) continue;
if (win->properties[i].atom == atom)
{
release_global_atom( atom );
win->properties[i].type = PROP_TYPE_FREE;
return win->properties[i].handle;
}
}
/* FIXME: last error? */
return 0;
}
/* find a window property */
static handle_t get_property( struct window *win, atom_t atom )
{
int i;
for (i = 0; i < win->prop_inuse; i++)
{
if (win->properties[i].type == PROP_TYPE_FREE) continue;
if (win->properties[i].atom == atom) return win->properties[i].handle;
}
/* FIXME: last error? */
return 0;
}
/* destroy all properties of a window */
inline static void destroy_properties( struct window *win )
{
int i;
if (!win->properties) return;
for (i = 0; i < win->prop_inuse; i++)
{
if (win->properties[i].type == PROP_TYPE_FREE) continue;
release_global_atom( win->properties[i].atom );
}
free( win->properties );
}
/* destroy a window */
static void destroy_window( struct window *win )
{
assert( win != top_window );
/* destroy all children */
while (win->first_child) destroy_window( win->first_child );
while (win->first_unlinked) destroy_window( win->first_unlinked );
/* reset siblings owner */
if (win->parent)
{
struct window *ptr;
for (ptr = win->parent->first_child; ptr; ptr = ptr->next)
if (ptr->owner == win) ptr->owner = NULL;
for (ptr = win->parent->first_unlinked; ptr; ptr = ptr->next)
if (ptr->owner == win) ptr->owner = NULL;
}
if (win->thread->queue)
{
if (win->paint_count) inc_queue_paint_count( win->thread, -win->paint_count );
queue_cleanup_window( win->thread, win->handle );
}
free_user_handle( win->handle );
destroy_properties( win );
unlink_window( win );
if (win->text) free( win->text );
memset( win, 0x55, sizeof(*win) );
free( win );
}
/* create a new window structure (note: the window is not linked in the window tree) */
static struct window *create_window( struct window *parent, struct window *owner, atom_t atom )
{
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 = parent;
win->owner = owner;
win->first_child = NULL;
win->last_child = NULL;
win->first_unlinked = NULL;
win->thread = current;
win->atom = atom;
win->style = 0;
win->ex_style = 0;
win->id = 0;
win->instance = NULL;
win->user_data = NULL;
win->text = NULL;
win->paint_count = 0;
win->prop_inuse = 0;
win->prop_alloc = 0;
win->properties = NULL;
if (parent) /* put it on parent unlinked list */
{
if ((win->next = parent->first_unlinked)) win->next->prev = win;
win->prev = NULL;
parent->first_unlinked = win;
}
else win->next = win->prev = NULL;
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;
destroy_window( win );
}
}
/* check whether child is a descendant of parent */
int is_child_window( user_handle_t parent, user_handle_t child )
{
struct window *child_ptr = get_user_object( child, USER_WINDOW );
struct window *parent_ptr = get_user_object( parent, USER_WINDOW );
if (!child_ptr || !parent_ptr) return 0;
while (child_ptr->parent)
{
if (child_ptr->parent == parent_ptr) return 1;
child_ptr = child_ptr->parent;
}
return 0;
}
/* return the thread owning a window */
struct thread *get_window_thread( user_handle_t handle )
{
struct window *win = get_user_object( handle, USER_WINDOW );
if (!win || !win->thread) return NULL;
return (struct thread *)grab_object( win->thread );
}
/* find a child of the specified window that needs repainting */
static struct window *find_child_to_repaint( struct window *parent, struct thread *thread )
{
struct window *ptr, *ret = NULL;
for (ptr = parent->first_child; ptr && !ret; ptr = ptr->next)
{
if (!(ptr->style & WS_VISIBLE)) continue;
if (ptr->paint_count && ptr->thread == thread)
ret = ptr;
else /* explore its children */
ret = find_child_to_repaint( ptr, thread );
}
if (ret && (ret->ex_style & WS_EX_TRANSPARENT))
{
/* transparent window, check for non-transparent sibling to paint first */
for (ptr = ret->next; ptr; ptr = ptr->next)
{
if (!(ptr->style & WS_VISIBLE)) continue;
if (ptr->ex_style & WS_EX_TRANSPARENT) continue;
if (ptr->paint_count && ptr->thread == thread) return ptr;
}
}
return ret;
}
/* find a window that needs repainting */
user_handle_t find_window_to_repaint( user_handle_t parent, struct thread *thread )
{
struct window *win = parent ? get_window( parent ) : top_window;
if (!win || !(win->style & WS_VISIBLE)) return 0;
if (!win->paint_count || win->thread != thread)
win = find_child_to_repaint( win, thread );
return win ? win->handle : 0;
}
/* create a window */
DECL_HANDLER(create_window)
{
reply->handle = 0;
if (!req->parent) /* return desktop window */
{
if (!top_window)
{
if (!(top_window = create_window( NULL, NULL, req->atom ))) return;
top_window->thread = NULL; /* no thread owns the desktop */
}
reply->handle = top_window->handle;
}
else
{
struct window *win, *parent, *owner = NULL;
if (!(parent = get_window( req->parent ))) return;
if (req->owner && !(owner = get_window( req->owner ))) return;
if (owner == top_window) owner = NULL;
else if (owner && owner->parent != parent)
{
/* owner must be a sibling of the new window */
set_error( STATUS_ACCESS_DENIED );
return;
}
if (!(win = create_window( parent, owner, req->atom ))) return;
reply->handle = win->handle;
}
}
/* link a window into the tree */
DECL_HANDLER(link_window)
{
struct window *win, *parent = NULL, *previous = NULL;
if (!(win = get_window( req->handle ))) return;
if (req->parent && !(parent = get_window( req->parent ))) return;
if (win == top_window)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
reply->full_parent = parent ? parent->handle : 0;
if (parent && req->previous)
{
if (req->previous == (user_handle_t)1) /* special case: HWND_BOTTOM */
{
previous = parent->last_child;
if (previous == win) return; /* nothing to do */
}
else
{
if (!(previous = get_window( req->previous ))) return;
/* previous must be a child of parent, and not win itself */
if (previous->parent != parent || previous == win)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
}
}
link_window( win, parent, previous );
}
/* destroy a window */
DECL_HANDLER(destroy_window)
{
struct window *win = get_window( req->handle );
if (win)
{
if (win != top_window) destroy_window( win );
else set_error( STATUS_ACCESS_DENIED );
}
}
/* set a window owner */
DECL_HANDLER(set_window_owner)
{
struct window *win = get_window( req->handle );
struct window *owner = get_window( req->owner );
if (!win || !owner) return;
if (owner->parent != win->parent)
{
/* owner has to be a sibling of window */
set_error( STATUS_ACCESS_DENIED );
return;
}
win->owner = owner;
reply->full_owner = owner->handle;
}
/* get information from a window handle */
DECL_HANDLER(get_window_info)
{
struct window *win = get_window( req->handle );
reply->full_handle = 0;
reply->tid = reply->pid = 0;
if (win)
{
reply->full_handle = win->handle;
if (win->thread)
{
reply->tid = get_thread_id( win->thread );
reply->pid = get_process_id( win->thread->process );
reply->atom = win->atom;
}
}
}
/* set some information in a window */
DECL_HANDLER(set_window_info)
{
struct window *win = get_window( req->handle );
if (!win) return;
reply->old_style = win->style;
reply->old_ex_style = win->ex_style;
reply->old_id = win->id;
reply->old_instance = win->instance;
reply->old_user_data = win->user_data;
if (req->flags & SET_WIN_STYLE) win->style = req->style;
if (req->flags & SET_WIN_EXSTYLE) win->ex_style = req->ex_style;
if (req->flags & SET_WIN_ID) win->id = req->id;
if (req->flags & SET_WIN_INSTANCE) win->instance = req->instance;
if (req->flags & SET_WIN_USERDATA) win->user_data = req->user_data;
}
/* get a list of the window parents, up to the root of the tree */
DECL_HANDLER(get_window_parents)
{
struct window *ptr, *win = get_window( req->handle );
int total = 0;
user_handle_t *data;
size_t len;
if (win) for (ptr = win->parent; ptr; ptr = ptr->parent) total++;
reply->count = total;
len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
if (len && ((data = set_reply_data_size( len ))))
{
for (ptr = win->parent; ptr && len; ptr = ptr->parent, len -= sizeof(*data))
*data++ = ptr->handle;
}
}
/* get a list of the window children */
DECL_HANDLER(get_window_children)
{
struct window *ptr, *parent = get_window( req->parent );
int total = 0;
user_handle_t *data;
size_t len;
if (parent)
for (ptr = parent->first_child, total = 0; ptr; ptr = ptr->next)
{
if (req->atom && ptr->atom != req->atom) continue;
if (req->tid && get_thread_id(ptr->thread) != req->tid) continue;
total++;
}
reply->count = total;
len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
if (len && ((data = set_reply_data_size( len ))))
{
for (ptr = parent->first_child; ptr && len; ptr = ptr->next, len -= sizeof(*data))
{
if (req->atom && ptr->atom != req->atom) continue;
if (req->tid && get_thread_id(ptr->thread) != req->tid) continue;
*data++ = ptr->handle;
}
}
}
/* get window tree information from a window handle */
DECL_HANDLER(get_window_tree)
{
struct window *win = get_window( req->handle );
if (!win) return;
if (win->parent)
{
struct window *parent = win->parent;
reply->parent = parent->handle;
reply->owner = win->owner ? win->owner->handle : 0;
reply->next_sibling = win->next ? win->next->handle : 0;
reply->prev_sibling = win->prev ? win->prev->handle : 0;
reply->first_sibling = parent->first_child ? parent->first_child->handle : 0;
reply->last_sibling = parent->last_child ? parent->last_child->handle : 0;
}
else
{
reply->parent = 0;
reply->owner = 0;
reply->next_sibling = 0;
reply->prev_sibling = 0;
reply->first_sibling = 0;
reply->last_sibling = 0;
}
reply->first_child = win->first_child ? win->first_child->handle : 0;
reply->last_child = win->last_child ? win->last_child->handle : 0;
}
/* set the window and client rectangles of a window */
DECL_HANDLER(set_window_rectangles)
{
struct window *win = get_window( req->handle );
if (win)
{
win->window_rect = req->window;
win->client_rect = req->client;
}
}
/* get the window and client rectangles of a window */
DECL_HANDLER(get_window_rectangles)
{
struct window *win = get_window( req->handle );
if (win)
{
reply->window = win->window_rect;
reply->client = win->client_rect;
}
}
/* get the window text */
DECL_HANDLER(get_window_text)
{
struct window *win = get_window( req->handle );
if (win && win->text)
{
size_t len = strlenW( win->text ) * sizeof(WCHAR);
if (len > get_reply_max_size()) len = get_reply_max_size();
set_reply_data( win->text, len );
}
}
/* set the window text */
DECL_HANDLER(set_window_text)
{
struct window *win = get_window( req->handle );
if (win)
{
WCHAR *text = NULL;
size_t len = get_req_data_size() / sizeof(WCHAR);
if (len)
{
if (!(text = mem_alloc( (len+1) * sizeof(WCHAR) ))) return;
memcpy( text, get_req_data(), len * sizeof(WCHAR) );
text[len] = 0;
}
if (win->text) free( win->text );
win->text = text;
}
}
/* increment the window paint count */
DECL_HANDLER(inc_window_paint_count)
{
struct window *win = get_window( req->handle );
if (win && win->thread)
{
int old = win->paint_count;
if ((win->paint_count += req->incr) < 0) win->paint_count = 0;
inc_queue_paint_count( win->thread, win->paint_count - old );
}
}
/* get the coordinates offset between two windows */
DECL_HANDLER(get_windows_offset)
{
struct window *win;
reply->x = reply->y = 0;
if (req->from)
{
if (!(win = get_window( req->from ))) return;
while (win)
{
reply->x += win->client_rect.left;
reply->y += win->client_rect.top;
win = win->parent;
}
}
if (req->to)
{
if (!(win = get_window( req->to ))) return;
while (win)
{
reply->x -= win->client_rect.left;
reply->y -= win->client_rect.top;
win = win->parent;
}
}
}
/* set a window property */
DECL_HANDLER(set_window_property)
{
struct window *win = get_window( req->window );
if (win) set_property( win, req->atom, req->handle,
req->string ? PROP_TYPE_STRING : PROP_TYPE_ATOM );
}
/* remove a window property */
DECL_HANDLER(remove_window_property)
{
struct window *win = get_window( req->window );
reply->handle = 0;
if (win) reply->handle = remove_property( win, req->atom );
}
/* get a window property */
DECL_HANDLER(get_window_property)
{
struct window *win = get_window( req->window );
reply->handle = 0;
if (win) reply->handle = get_property( win, req->atom );
}
/* get the list of properties of a window */
DECL_HANDLER(get_window_properties)
{
property_data_t *data;
int i, count, max = get_reply_max_size() / sizeof(*data);
struct window *win = get_window( req->window );
reply->total = 0;
if (!win) return;
for (i = count = 0; i < win->prop_inuse; i++)
if (win->properties[i].type != PROP_TYPE_FREE) count++;
reply->total = count;
if (count > max) count = max;
if (!count || !(data = set_reply_data_size( count * sizeof(*data) ))) return;
for (i = 0; i < win->prop_inuse && count; i++)
{
if (win->properties[i].type == PROP_TYPE_FREE) continue;
data->atom = win->properties[i].atom;
data->string = (win->properties[i].type == PROP_TYPE_STRING);
data->handle = win->properties[i].handle;
data++;
count--;
}
}
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