Paul Pogonyshev wrote:
> daa84 wrote:
>> daa84 ?????:
>> > I start to write my widget with FlowLayout functionality (with
>>> row-breaking). And find next problem:
>>>
>>> gtk_widget_size_request function obtains the preferred size of a widget
>>> gtk_widget_size_allocate assign a size and position to child widgets
>>>
>>> When I fill GtkRequisition structure I send my preferred size of a
>>> widget (width and height). But in size_allocate function I get new width
>>> that smaller then first width value. Than it is need to increase size.
>>> How can I do it? Initiate call size_request function another one time or
>>> change GtkAllocation values.
>>>
>>> This is only my thoughts, I don't test this in code for now.
>
> Initiate new resizing session and be sure to request smaller size next time
> (so that you are not allocated this size again.) GTK+ is not really suited
> for full-scaled negotiation of size.
>
> Adjusting allocation values will not achieve anything since the container
> (the one which your flow-layout one is in) will not care.
>
>> I solve this problem using gtk_widget_set_size_request function in
>> allocation function.
>
> This is good as long as the number and size requests of the widgets your
> container contains don't change, which is hard to say in advance, especially
> the latter part. Less importantly, this will break if theme/font/etc. is
> changed in runtime.
>
> Paul
>
>
I write next code for size_allocate function and all work fine (window
resizing processed normally):
width = 0;
rows_count = 1;
row_height = 1;
for (cur = g_list_first (priv->buttons_list); cur != NULL; cur =
g_list_next (cur))
{
child = GTK_WIDGET (cur->data);
if (GTK_WIDGET_VISIBLE (child))
{
gtk_widget_size_request (child, &child_req);
width += child_req.width;
if (width > allocation->width &&
width != child_req.width)
{
rows_count++;
width = child_req.width;
}
row_height = MAX (row_height, child_req.height);
}
}
if (priv->rows_count != rows_count ||
priv->row_height != row_height)
{
priv->rows_count = rows_count;
priv->row_height = row_height;
gtk_widget_set_size_request (widget, -1, row_height * rows_count);
}
width = 0;
row = 1;
for (cur = g_list_first (priv->buttons_list); cur != NULL; cur =
g_list_next (cur))
{
child = GTK_WIDGET (cur->data);
if (GTK_WIDGET_VISIBLE (child))
{
gtk_widget_get_child_requisition (child, &child_req);
width += child_req.width;
if (width > allocation->width &&
width != child_req.width) // this need when width is vary
small
{
row++;
width = child_req.width;
}
child_alloc.width = child_req.width;
child_alloc.height = row_height;
child_alloc.x = allocation->x + width - child_req.width;
child_alloc.y = allocation->y + row_height * (row - 1);
gtk_widget_size_allocate (child, &child_alloc);
}
}
And no implementation for size_request function.
I don't fully understand what gtk_widget_set_size_request doing, I find
this solution in gimp sources.
Thanks!
Sorry for my bad English.
--
Andrey Dubravin
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