gdkgeometry-x11.c

linux下电话本所依赖的一些图形库

      gdk_window_postmove (tmp_list->data, &parent_pos);
      tmp_list = tmp_list->next;
    }
}

/**
 * gdk_window_scroll:
 * @window: a #GdkWindow
 * @dx: Amount to scroll in the X direction
 * @dy: Amount to scroll in the Y direction
 * 
 * Scroll the contents of @window, both pixels and children, by the given
 * amount. @window itself does not move.  Portions of the window that the scroll
 * operation brings in from offscreen areas are invalidated. The invalidated
 * region may be bigger than what would strictly be necessary.  (For X11, a
 * minimum area will be invalidated if the window has no subwindows, or if the
 * edges of the window's parent do not extend beyond the edges of the window. In
 * other cases, a multi-step process is used to scroll the window which may
 * produce temporary visual artifacts and unnecessary invalidations.)
 **/
void
gdk_window_scroll (GdkWindow *window,
		   gint       dx,
		   gint       dy)
{
  gboolean can_guffaw_scroll = FALSE;
  GdkRegion *invalidate_region;
  GdkWindowImplX11 *impl;
  GdkWindowObject *obj;
  GdkRectangle src_rect, dest_rect;
  
  g_return_if_fail (GDK_IS_WINDOW (window));

  if (GDK_WINDOW_DESTROYED (window))
    return;
  
  obj = GDK_WINDOW_OBJECT (window);
  impl = GDK_WINDOW_IMPL_X11 (obj->impl);  

  if (dx == 0 && dy == 0)
    return;
  
  /* Move the current invalid region */
  if (obj->update_area)
    gdk_region_offset (obj->update_area, dx, dy);
  
  /* impl->position_info.clip_rect isn't meaningful for toplevels */
  if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_CHILD)
    src_rect = impl->position_info.clip_rect;
  else
    {
      src_rect.x = 0;
      src_rect.y = 0;
      src_rect.width = impl->width;
      src_rect.height = impl->height;
    }
  
  invalidate_region = gdk_region_rectangle (&src_rect);

  dest_rect = src_rect;
  dest_rect.x += dx;
  dest_rect.y += dy;
  gdk_rectangle_intersect (&dest_rect, &src_rect, &dest_rect);

  if (dest_rect.width > 0 && dest_rect.height > 0)
    {
      GdkRegion *tmp_region;

      tmp_region = gdk_region_rectangle (&dest_rect);
      gdk_region_subtract (invalidate_region, tmp_region);
      gdk_region_destroy (tmp_region);
    }
  
  gdk_window_invalidate_region (window, invalidate_region, TRUE);
  gdk_region_destroy (invalidate_region);

  /* We can guffaw scroll if we are a child window, and the parent
   * does not extend beyond our edges. Otherwise, we use XCopyArea, then
   * move any children later
   */
  if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_CHILD)
    {
      GdkWindowImplX11 *parent_impl = GDK_WINDOW_IMPL_X11 (obj->parent->impl);  
      can_guffaw_scroll = ((dx == 0 || (obj->x <= 0 && obj->x + impl->width >= parent_impl->width)) &&
			   (dy == 0 || (obj->y <= 0 && obj->y + impl->height >= parent_impl->height)));
    }

  if (!obj->children || !can_guffaw_scroll)
    gdk_window_copy_area_scroll (window, &dest_rect, dx, dy);
  else
    gdk_window_guffaw_scroll (window, dx, dy);
}

void
_gdk_window_move_resize_child (GdkWindow *window,
			       gint       x,
			       gint       y,
			       gint       width,
			       gint       height)
{
  GdkWindowImplX11 *impl;
  GdkWindowObject *obj;
  GdkXPositionInfo new_info;
  GdkWindowParentPos parent_pos;
  GList *tmp_list;
  
  gint d_xoffset, d_yoffset;
  gint dx, dy;
  gboolean is_move;
  gboolean is_resize;
  
  g_return_if_fail (window != NULL);
  g_return_if_fail (GDK_IS_WINDOW (window));

  impl = GDK_WINDOW_IMPL_X11 (GDK_WINDOW_OBJECT (window)->impl);
  obj = GDK_WINDOW_OBJECT (window);
  
  dx = x - obj->x;
  dy = y - obj->y;
  
  is_move = dx != 0 || dy != 0;
  is_resize = impl->width != width || impl->height != height;

  if (!is_move && !is_resize)
    return;
  
  obj->x = x;
  obj->y = y;
  impl->width = width;
  impl->height = height;

  gdk_window_compute_parent_pos (impl, &parent_pos);
  gdk_window_compute_position (impl, &parent_pos, &new_info);

  gdk_window_clip_changed (window, &impl->position_info.clip_rect, &new_info.clip_rect);

  parent_pos.x += obj->x;
  parent_pos.y += obj->y;
  parent_pos.x11_x += new_info.x;
  parent_pos.x11_y += new_info.y;
  parent_pos.clip_rect = new_info.clip_rect;

  d_xoffset = new_info.x_offset - impl->position_info.x_offset;
  d_yoffset = new_info.y_offset - impl->position_info.y_offset;
  
  if (d_xoffset != 0 || d_yoffset != 0)
    {
      GdkRectangle new_position;

      gdk_window_set_static_gravities (window, TRUE);

      if (d_xoffset < 0 || d_yoffset < 0)
	gdk_window_queue_translation (window, MIN (d_xoffset, 0), MIN (d_yoffset, 0));

      compute_intermediate_position (&impl->position_info, &new_info, d_xoffset, d_yoffset,
				     &new_position);
      
      XMoveResizeWindow (GDK_WINDOW_XDISPLAY (window),
			 GDK_WINDOW_XID (window),
			 new_position.x, new_position.y, new_position.width, new_position.height);
      
      tmp_list = obj->children;
      while (tmp_list)
	{
	  gdk_window_premove (tmp_list->data, &parent_pos);
	  tmp_list = tmp_list->next;
	}

      XMoveWindow (GDK_WINDOW_XDISPLAY (window),
		   GDK_WINDOW_XID (window),
		   new_position.x + dx, new_position.y + dy);
      
      if (d_xoffset > 0 || d_yoffset > 0)
	gdk_window_queue_translation (window, MAX (d_xoffset, 0), MAX (d_yoffset, 0));
      
      XMoveResizeWindow (GDK_WINDOW_XDISPLAY (window),
			 GDK_WINDOW_XID (window),
			 new_info.x, new_info.y, new_info.width, new_info.height);
      
      if (impl->position_info.no_bg)
	_gdk_x11_window_tmp_reset_bg (window, FALSE);

      if (!impl->position_info.mapped && new_info.mapped && GDK_WINDOW_IS_MAPPED (obj))
	XMapWindow (GDK_WINDOW_XDISPLAY (window), GDK_WINDOW_XID (window));
      
      impl->position_info = new_info;
      
      tmp_list = obj->children;
      while (tmp_list)
	{
	  gdk_window_postmove (tmp_list->data, &parent_pos);
	  tmp_list = tmp_list->next;
	}
    }
  else
    {
      if (is_move && is_resize)
	gdk_window_set_static_gravities (window, FALSE);

      if (impl->position_info.mapped && !new_info.mapped)
	XUnmapWindow (GDK_WINDOW_XDISPLAY (window), GDK_WINDOW_XID (window));
      
      tmp_list = obj->children;
      while (tmp_list)
	{
	  gdk_window_premove (tmp_list->data, &parent_pos);
	  tmp_list = tmp_list->next;
	}

      if (is_resize)
	XMoveResizeWindow (GDK_WINDOW_XDISPLAY (window),
			   GDK_WINDOW_XID (window),
			   new_info.x, new_info.y, new_info.width, new_info.height);
      else
	XMoveWindow (GDK_WINDOW_XDISPLAY (window),
		     GDK_WINDOW_XID (window),
		     new_info.x, new_info.y);

      tmp_list = obj->children;
      while (tmp_list)
	{
	  gdk_window_postmove (tmp_list->data, &parent_pos);
	  tmp_list = tmp_list->next;
	}

      if (impl->position_info.no_bg)
	_gdk_x11_window_tmp_reset_bg (window, FALSE);

      if (!impl->position_info.mapped && new_info.mapped && GDK_WINDOW_IS_MAPPED (obj))
	XMapWindow (GDK_WINDOW_XDISPLAY (window), GDK_WINDOW_XID (window));

      impl->position_info = new_info;
    }
}

static void
gdk_window_compute_position (GdkWindowImplX11   *window,
			     GdkWindowParentPos *parent_pos,
			     GdkXPositionInfo   *info)
{
  GdkWindowObject *wrapper;
  int parent_x_offset;
  int parent_y_offset;

  g_return_if_fail (GDK_IS_WINDOW_IMPL_X11 (window));

  wrapper = GDK_WINDOW_OBJECT (GDK_DRAWABLE_IMPL_X11 (window)->wrapper);
  
  info->big = FALSE;
  
  if (window->width <= 32767)
    {
      info->width = window->width;
      info->x = parent_pos->x + wrapper->x - parent_pos->x11_x;
    }
  else
    {
      info->big = TRUE;
      info->width = 32767;
      if (parent_pos->x + wrapper->x < -16384)
	{
	  if (parent_pos->x + wrapper->x + window->width < 16384)
	    info->x = parent_pos->x + wrapper->x + window->width - info->width - parent_pos->x11_x;
	  else
	    info->x = -16384 - parent_pos->x11_x;
	}
      else
	info->x = parent_pos->x + wrapper->x - parent_pos->x11_x;
    }

  if (window->height <= 32767)
    {
      info->height = window->height;
      info->y = parent_pos->y + wrapper->y - parent_pos->x11_y;
    }
  else
    {
      info->big = TRUE;
      info->height = 32767;
      if (parent_pos->y + wrapper->y < -16384)
	{
	  if (parent_pos->y + wrapper->y + window->height < 16384)
	    info->y = parent_pos->y + wrapper->y + window->height - info->height - parent_pos->x11_y;
	  else
	    info->y = -16384 - parent_pos->x11_y;
	}
      else
	info->y = parent_pos->y + wrapper->y - parent_pos->x11_y;
    }

  parent_x_offset = parent_pos->x11_x - parent_pos->x;
  parent_y_offset = parent_pos->x11_y - parent_pos->y;
  
  info->x_offset = parent_x_offset + info->x - wrapper->x;
  info->y_offset = parent_y_offset + info->y - wrapper->y;

  /* We don't considering the clipping of toplevel windows and their immediate children
   * by their parents, and simply always map those windows.
   */
  if (parent_pos->clip_rect.width == G_MAXINT)
    info->mapped = TRUE;
  /* Check if the window would wrap around into the visible space in either direction */
  else if (info->x + parent_x_offset < parent_pos->clip_rect.x + parent_pos->clip_rect.width - 65536 ||
      info->x + info->width + parent_x_offset > parent_pos->clip_rect.x + 65536 ||
      info->y + parent_y_offset < parent_pos->clip_rect.y + parent_pos->clip_rect.height - 65536 ||
      info->y + info->height + parent_y_offset  > parent_pos->clip_rect.y + 65536)
    info->mapped = FALSE;
  else
    info->mapped = TRUE;

  info->no_bg = FALSE;

  if (GDK_WINDOW_TYPE (wrapper) == GDK_WINDOW_CHILD)
    {
      info->clip_rect.x = wrapper->x;
      info->clip_rect.y = wrapper->y;
      info->clip_rect.width = window->width;
      info->clip_rect.height = window->height;
      
      gdk_rectangle_intersect (&info->clip_rect, &parent_pos->clip_rect, &info->clip_rect);

      info->clip_rect.x -= wrapper->x;
      info->clip_rect.y -= wrapper->y;
    }
  else
    {
      info->clip_rect.x = 0;
      info->clip_rect.y = 0;
      info->clip_rect.width = G_MAXINT;
      info->clip_rect.height = G_MAXINT;
    }
}

static void
gdk_window_compute_parent_pos (GdkWindowImplX11      *window,
			       GdkWindowParentPos *parent_pos)
{
  GdkWindowObject *wrapper;
  GdkWindowObject *parent;
  GdkRectangle tmp_clip;
  
  int clip_xoffset = 0;
  int clip_yoffset = 0;

  g_return_if_fail (GDK_IS_WINDOW_IMPL_X11 (window));

  wrapper =
    GDK_WINDOW_OBJECT (GDK_DRAWABLE_IMPL_X11 (window)->wrapper);
  
  parent_pos->x = 0;
  parent_pos->y = 0;
  parent_pos->x11_x = 0;
  parent_pos->x11_y = 0;

  /* We take a simple approach here and simply consider toplevel
   * windows not to clip their children on the right/bottom, since the
   * size of toplevel windows is not directly under our
   * control. Clipping only really matters when scrolling and
   * generally we aren't going to be moving the immediate child of a
   * toplevel beyond the bounds of that toplevel.
   *
   * We could go ahead and recompute the clips of toplevel windows and
   * their descendents when we receive size notification, but it would
   * probably not be an improvement in most cases.
   */
  parent_pos->clip_rect.x = 0;
  parent_pos->clip_rect.y = 0;
  parent_pos->clip_rect.width = G_MAXINT;
  parent_pos->clip_rect.height = G_MAXINT;