AuroraMiddleware/gtk
1
0
Fork 1
mirror of https://gitlab.gnome.org/GNOME/gtk.git synced 2024-11-19 18:00:09 +00:00
Code Issues Projects Releases Wiki Activity

Reimplemented GtkExtendedLayout on GtkBin

Browse Source 
Instead of implementing ->get_desired_size() on GtkBin, which
cant really be done because border widths are in the domain of
the concrete subclasses; here we implement only the get_height_for_width
and get_width_for_height apis - GtkBin subclasses whom might have a
variable border width depending on allocations need to write their
own height-for-width implementations.
This commit is contained in:
Tristan Van Berkom 2010-04-09 00:19:42 -04:00
parent b3303727ad
commit 73056e92d8
1 changed files with 109 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

110
gtk/gtkbin.c
View File

@ -26,6 +26,7 @@
#include "config.h"
#include "gtkbin.h"
#include "gtkextendedlayout.h"
#include "gtkintl.h"
#include "gtkalias.h"
@ -40,7 +41,22 @@ static void gtk_bin_forall (GtkContainer *container,
static GType gtk_bin_child_type (GtkContainer *container);
G_DEFINE_ABSTRACT_TYPE (GtkBin, gtk_bin, GTK_TYPE_CONTAINER)
static void gtk_bin_extended_layout_init (GtkExtendedLayoutIface *iface);
static void gtk_bin_get_width_for_height (GtkExtendedLayout *layout,
gint height,
gint *minimum_width,
gint *natural_width);
static void gtk_bin_get_height_for_width (GtkExtendedLayout *layout,
gint width,
gint *minimum_height,
gint *natural_height);
GtkExtendedLayoutIface *parent_extended_layout_iface;
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkBin, gtk_bin, GTK_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (GTK_TYPE_EXTENDED_LAYOUT,
gtk_bin_extended_layout_init))
static void
gtk_bin_class_init (GtkBinClass *class)
@ -128,6 +144,98 @@ gtk_bin_forall (GtkContainer *container,
(* callback) (bin->child, callback_data);
}
/* GtkBin widgets define the padding and borders independantly so
* we cannot provide a generic get_desired_size() for the same reason
* we never implemented size_request() here.
*
* But for cases where the GtkBin class's padding is constant and
* does not vary based on allocation (most cases), we can at least
* deduce a common code path for the get_width_for_height()/get_height_for_width()
* cases by using the delta of the base size requsts.
*/
static void
gtk_bin_extended_layout_init (GtkExtendedLayoutIface *iface)
{
parent_extended_layout_iface = g_type_interface_peek_parent (iface);
iface->get_width_for_height = gtk_bin_get_width_for_height;
iface->get_height_for_width = gtk_bin_get_height_for_width;
}
static void
get_child_padding_delta (GtkBin *bin,
gint *delta_h,
gint *delta_v)
{
GtkRequisition min_req, child_min;
gtk_extended_layout_get_desired_size (GTK_EXTENDED_LAYOUT (bin),
&min_req, NULL);
gtk_extended_layout_get_desired_size (GTK_EXTENDED_LAYOUT (bin->child),
&child_min, NULL);
*delta_h = min_req.width - child_min.width;
*delta_v = min_req.height - child_min.height;
}
static void
gtk_bin_get_width_for_height (GtkExtendedLayout *layout,
gint height,
gint *minimum_width,
gint *natural_width)
{
GtkBin *bin = GTK_BIN (layout);
gint hdelta, vdelta, child_min, child_nat;
if (bin->child)
{
get_child_padding_delta (bin, &hdelta, &vdelta);
gtk_extended_layout_get_width_for_height (GTK_EXTENDED_LAYOUT (bin->child),
height - vdelta,
&child_min, &child_nat);
if (minimum_width)
*minimum_width = child_min + hdelta;
if (natural_width)
*natural_width = child_nat + hdelta;
}
else
parent_extended_layout_iface->get_height_for_width (layout, height, minimum_width, natural_width);
}
static void
gtk_bin_get_height_for_width (GtkExtendedLayout *layout,
gint width,
gint *minimum_height,
gint *natural_height)
{
GtkBin *bin = GTK_BIN (layout);
gint hdelta, vdelta, child_min, child_nat;
if (bin->child)
{
get_child_padding_delta (bin, &hdelta, &vdelta);
gtk_extended_layout_get_height_for_width (GTK_EXTENDED_LAYOUT (bin->child),
width - hdelta,
&child_min, &child_nat);
if (minimum_height)
*minimum_height = child_min + vdelta;
if (natural_height)
*natural_height = child_nat + vdelta;
}
else
parent_extended_layout_iface->get_height_for_width (layout, width, minimum_height, natural_height);
}
/**
* gtk_bin_get_child:
* @bin: a #GtkBin