gtktable.c

gtk是linux一款强大的夸平台的图形化开发工具

		{
		  width += table->cols[col].requisition;
		  if ((col + 1) < child->right_attach)
		    width += table->cols[col].spacing;
		}
	      
	      /* If we need to request more space for this child to fill
	       *  its requisition, then divide up the needed space evenly
	       *  amongst the columns it spans.
	       */
	      if (width < child_requisition.width + child->xpadding * 2)
		{
		  width = child_requisition.width + child->xpadding * 2 - width;
		  
		  for (col = child->left_attach; col < child->right_attach; col++)
		    {
		      extra = width / (child->right_attach - col);
		      table->cols[col].requisition += extra;
		      width -= extra;
		    }
		}
	    }
	  
	  /* Child spans multiple rows.
	   */
	  if (child->top_attach != (child->bottom_attach - 1))
	    {
	      GtkRequisition child_requisition;

	      gtk_widget_get_child_requisition (child->widget, &child_requisition);

	      /* Check and see if there is already enough space
	       *  for the child.
	       */
	      height = 0;
	      for (row = child->top_attach; row < child->bottom_attach; row++)
		{
		  height += table->rows[row].requisition;
		  if ((row + 1) < child->bottom_attach)
		    height += table->rows[row].spacing;
		}
	      
	      /* If we need to request more space for this child to fill
	       *  its requisition, then divide up the needed space evenly
	       *  amongst the columns it spans.
	       */
	      if (height < child_requisition.height + child->ypadding * 2)
		{
		  height = child_requisition.height + child->ypadding * 2 - height;
		  
		  for (row = child->top_attach; row < child->bottom_attach; row++)
		    {
		      extra = height / (child->bottom_attach - row);
		      table->rows[row].requisition += extra;
		      height -= extra;
		    }
		}
	    }
	}
    }
}

static void
gtk_table_size_allocate_init (GtkTable *table)
{
  GtkTableChild *child;
  GList *children;
  gint row, col;
  gint has_expand;
  gint has_shrink;
  
  /* Initialize the rows and cols.
   *  By default, rows and cols do not expand and do shrink.
   *  Those values are modified by the children that occupy
   *  the rows and cols.
   */
  for (col = 0; col < table->ncols; col++)
    {
      table->cols[col].allocation = table->cols[col].requisition;
      table->cols[col].need_expand = FALSE;
      table->cols[col].need_shrink = TRUE;
      table->cols[col].expand = FALSE;
      table->cols[col].shrink = TRUE;
      table->cols[col].empty = TRUE;
    }
  for (row = 0; row < table->nrows; row++)
    {
      table->rows[row].allocation = table->rows[row].requisition;
      table->rows[row].need_expand = FALSE;
      table->rows[row].need_shrink = TRUE;
      table->rows[row].expand = FALSE;
      table->rows[row].shrink = TRUE;
      table->rows[row].empty = TRUE;
    }
  
  /* Loop over all the children and adjust the row and col values
   *  based on whether the children want to be allowed to expand
   *  or shrink. This loop handles children that occupy a single
   *  row or column.
   */
  children = table->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      if (GTK_WIDGET_VISIBLE (child->widget))
	{
	  if (child->left_attach == (child->right_attach - 1))
	    {
	      if (child->xexpand)
		table->cols[child->left_attach].expand = TRUE;
	      
	      if (!child->xshrink)
		table->cols[child->left_attach].shrink = FALSE;
	      
	      table->cols[child->left_attach].empty = FALSE;
	    }
	  
	  if (child->top_attach == (child->bottom_attach - 1))
	    {
	      if (child->yexpand)
		table->rows[child->top_attach].expand = TRUE;
	      
	      if (!child->yshrink)
		table->rows[child->top_attach].shrink = FALSE;

	      table->rows[child->top_attach].empty = FALSE;
	    }
	}
    }
  
  /* Loop over all the children again and this time handle children
   *  which span multiple rows or columns.
   */
  children = table->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      if (GTK_WIDGET_VISIBLE (child->widget))
	{
	  if (child->left_attach != (child->right_attach - 1))
	    {
	      for (col = child->left_attach; col < child->right_attach; col++)
		table->cols[col].empty = FALSE;

	      if (child->xexpand)
		{
		  has_expand = FALSE;
		  for (col = child->left_attach; col < child->right_attach; col++)
		    if (table->cols[col].expand)
		      {
			has_expand = TRUE;
			break;
		      }
		  
		  if (!has_expand)
		    for (col = child->left_attach; col < child->right_attach; col++)
		      table->cols[col].need_expand = TRUE;
		}
	      
	      if (!child->xshrink)
		{
		  has_shrink = TRUE;
		  for (col = child->left_attach; col < child->right_attach; col++)
		    if (!table->cols[col].shrink)
		      {
			has_shrink = FALSE;
			break;
		      }
		  
		  if (has_shrink)
		    for (col = child->left_attach; col < child->right_attach; col++)
		      table->cols[col].need_shrink = FALSE;
		}
	    }
	  
	  if (child->top_attach != (child->bottom_attach - 1))
	    {
	      for (row = child->top_attach; row < child->bottom_attach; row++)
		table->rows[row].empty = FALSE;

	      if (child->yexpand)
		{
		  has_expand = FALSE;
		  for (row = child->top_attach; row < child->bottom_attach; row++)
		    if (table->rows[row].expand)
		      {
			has_expand = TRUE;
			break;
		      }
		  
		  if (!has_expand)
		    for (row = child->top_attach; row < child->bottom_attach; row++)
		      table->rows[row].need_expand = TRUE;
		}
	      
	      if (!child->yshrink)
		{
		  has_shrink = TRUE;
		  for (row = child->top_attach; row < child->bottom_attach; row++)
		    if (!table->rows[row].shrink)
		      {
			has_shrink = FALSE;
			break;
		      }
		  
		  if (has_shrink)
		    for (row = child->top_attach; row < child->bottom_attach; row++)
		      table->rows[row].need_shrink = FALSE;
		}
	    }
	}
    }
  
  /* Loop over the columns and set the expand and shrink values
   *  if the column can be expanded or shrunk.
   */
  for (col = 0; col < table->ncols; col++)
    {
      if (table->cols[col].empty)
	{
	  table->cols[col].expand = FALSE;
	  table->cols[col].shrink = FALSE;
	}
      else
	{
	  if (table->cols[col].need_expand)
	    table->cols[col].expand = TRUE;
	  if (!table->cols[col].need_shrink)
	    table->cols[col].shrink = FALSE;
	}
    }
  
  /* Loop over the rows and set the expand and shrink values
   *  if the row can be expanded or shrunk.
   */
  for (row = 0; row < table->nrows; row++)
    {
      if (table->rows[row].empty)
	{
	  table->rows[row].expand = FALSE;
	  table->rows[row].shrink = FALSE;
	}
      else
	{
	  if (table->rows[row].need_expand)
	    table->rows[row].expand = TRUE;
	  if (!table->rows[row].need_shrink)
	    table->rows[row].shrink = FALSE;
	}
    }
}

static void
gtk_table_size_allocate_pass1 (GtkTable *table)
{
  gint real_width;
  gint real_height;
  gint width, height;
  gint row, col;
  gint nexpand;
  gint nshrink;
  gint extra;
  
  /* If we were allocated more space than we requested
   *  then we have to expand any expandable rows and columns
   *  to fill in the extra space.
   */
  
  real_width = GTK_WIDGET (table)->allocation.width - GTK_CONTAINER (table)->border_width * 2;
  real_height = GTK_WIDGET (table)->allocation.height - GTK_CONTAINER (table)->border_width * 2;
  
  if (table->homogeneous)
    {
      nexpand = 0;
      for (col = 0; col < table->ncols; col++)
	if (table->cols[col].expand)
	  {
	    nexpand += 1;
	    break;
	  }
      
      if (nexpand > 0)
	{
	  width = real_width;
	  
	  for (col = 0; col + 1 < table->ncols; col++)
	    width -= table->cols[col].spacing;
	  
	  for (col = 0; col < table->ncols; col++)
	    {
	      extra = width / (table->ncols - col);
	      table->cols[col].allocation = MAX (1, extra);
	      width -= extra;
	    }
	}
    }
  else
    {
      width = 0;
      nexpand = 0;
      nshrink = 0;
      
      for (col = 0; col < table->ncols; col++)
	{
	  width += table->cols[col].requisition;
	  if (table->cols[col].expand)
	    nexpand += 1;
	  if (table->cols[col].shrink)
	    nshrink += 1;
	}
      for (col = 0; col + 1 < table->ncols; col++)
	width += table->cols[col].spacing;
      
      /* Check to see if we were allocated more width than we requested.
       */
      if ((width < real_width) && (nexpand >= 1))
	{
	  width = real_width - width;
	  
	  for (col = 0; col < table->ncols; col++)
	    if (table->cols[col].expand)
	      {
		extra = width / nexpand;
		table->cols[col].allocation += extra;
		
		width -= extra;
		nexpand -= 1;
	      }
	}
      
      /* Check to see if we were allocated less width than we requested.
       */
      if ((width > real_width) && (nshrink >= 1))
	{
	  width = width - real_width;
	  
	  for (col = 0; col < table->ncols; col++)
	    if (table->cols[col].shrink)
	      {
		extra = width / nshrink;
		table->cols[col].allocation = MAX (1, (gint)table->cols[col].allocation - extra);
		
		width -= extra;
		nshrink -= 1;
	      }
	}
    }
  
  if (table->homogeneous)
    {
      nexpand = 0;
      for (row = 0; row < table->nrows; row++)
	if (table->rows[row].expand)
	  {
	    nexpand += 1;
	    break;
	  }
      
      if (nexpand > 0)
	{
	  height = real_height;
	  
	  for (row = 0; row + 1 < table->nrows; row++)
	    height -= table->rows[row].spacing;
	  
	  
	  for (row = 0; row < table->nrows; row++)
	    {
	      extra = height / (table->nrows - row);
	      table->rows[row].allocation = MAX (1, extra);
	      height -= extra;
	    }
	}
    }
  else
    {
      height = 0;
      nexpand = 0;
      nshrink = 0;
      
      for (row = 0; row < table->nrows; row++)
	{
	  height += table->rows[row].requisition;
	  if (table->rows[row].expand)
	    nexpand += 1;
	  if (table->rows[row].shrink)
	    nshrink += 1;
	}
      for (row = 0; row + 1 < table->nrows; row++)
	height += table->rows[row].spacing;
      
      /* Check to see if we were allocated more height than we requested.
       */
      if ((height < real_height) && (nexpand >= 1))
	{
	  height = real_height - height;
	  
	  for (row = 0; row < table->nrows; row++)
	    if (table->rows[row].expand)
	      {
		extra = height / nexpand;
		table->rows[row].allocation += extra;
		
		height -= extra;
		nexpand -= 1;
	      }
	}
      
      /* Check to see if we were allocated less height than we requested.
       */
      if ((height > real_height) && (nshrink >= 1))
	{
	  height = height - real_height;
	  
	  for (row = 0; row < table->nrows; row++)
	    if (table->rows[row].shrink)
	      {
		extra = height / nshrink;
		table->rows[row].allocation = MAX (1, (gint)table->rows[row].allocation - extra);
		
		height -= extra;
		nshrink -= 1;
	      }
	}
    }
}

static void
gtk_table_size_allocate_pass2 (GtkTable *table)
{
  GtkTableChild *child;
  GList *children;
  gint max_width;
  gint max_height;
  gint x, y;
  gint row, col;
  GtkAllocation allocation;
  
  children = table->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      if (GTK_WIDGET_VISIBLE (child->widget))
	{
	  GtkRequisition child_requisition;
	  gtk_widget_get_child_requisition (child->widget, &child_requisition);

	  x = GTK_WIDGET (table)->allocation.x + GTK_CONTAINER (table)->border_width;
	  y = GTK_WIDGET (table)->allocation.y + GTK_CONTAINER (table)->border_width;
	  max_width = 0;
	  max_height = 0;
	  
	  for (col = 0; col < child->left_attach; col++)
	    {
	      x += table->cols[col].allocation;
	      x += table->cols[col].spacing;
	    }
	  
	  for (col = child->left_attach; col < child->right_attach; col++)
	    {
	      max_width += table->cols[col].allocation;
	      if ((col + 1) < child->right_attach)
		max_width += table->cols[col].spacing;
	    }
	  
	  for (row = 0; row < child->top_attach; row++)
	    {
	      y += table->rows[row].allocation;
	      y += table->rows[row].spacing;
	    }
	  
	  for (row = child->top_attach; row < child->bottom_attach; row++)
	    {
	      max_height += table->rows[row].allocation;
	      if ((row + 1) < child->bottom_attach)
		max_height += table->rows[row].spacing;
	    }
	  
	  if (child->xfill)
	    {
	      allocation.width = MAX (1, max_width - (gint)child->xpadding * 2);
	      allocation.x = x + (max_width - allocation.width) / 2;
	    }
	  else
	    {
	      allocation.width = child_requisition.width;
	      allocation.x = x + (max_width - allocation.width) / 2;
	    }
	  
	  if (child->yfill)
	    {
	      allocation.height = MAX (1, max_height - (gint)child->ypadding * 2);
	      allocation.y = y + (max_height - allocation.height) / 2;
	    }
	  else
	    {
	      allocation.height = child_requisition.height;
	      allocation.y = y + (max_height - allocation.height) / 2;
	    }
	  
	  gtk_widget_size_allocate (child->widget, &allocation);
	}
    }
}