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center box: Support expand property

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We expand the center child first, but only as far
as we can keep it centered.
This commit is contained in:
Matthias Clasen 2017-06-03 22:44:19 -04:00
parent 60cd5b9b4c
commit 42921750ff
1 changed files with 63 additions and 18 deletions
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79
gtk/gtkcenterbox.c
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@ -46,6 +46,8 @@
#include "gtkcenterbox.h"
#include "gtkcssnodeprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkorientable.h"
#include "gtkorientableprivate.h"
#include "gtkbuildable.h"
struct _GtkCenterBox
@ -163,6 +165,9 @@ gtk_center_box_size_allocate (GtkWidget *widget,
int right_min = 0;
int right_nat = 0;
int avail;
gboolean left_expand = FALSE;
gboolean center_expand = FALSE;
gboolean right_expand = FALSE;
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
{
@ -192,35 +197,29 @@ gtk_center_box_size_allocate (GtkWidget *widget,
allocation->height,
&center_min, &center_nat, NULL, NULL);
child_allocation.y = allocation->y;
child_allocation.height = allocation->height;
if (self->center_widget)
{
center_size = CLAMP (allocation->width - (left_min + right_min), center_min, center_nat);
center_expand = gtk_widget_get_hexpand (self->center_widget);
}
if (left)
{
avail = MIN ((allocation->width - center_size) / 2, allocation->width - (center_size + right_min));
child_allocation.width = CLAMP (avail, left_min, left_nat);
child_allocation.x = allocation->x;
gtk_widget_size_allocate (left, &child_allocation);
gtk_widget_get_clip (left, &child_clip);
gdk_rectangle_union (&clip, &clip, &child_clip);
left_size = child_allocation.width;
left_size = CLAMP (avail, left_min, left_nat);
left_expand = gtk_widget_get_hexpand (left);
}
if (right)
{
avail = MIN ((allocation->width - center_size) / 2, allocation->width - (center_size + left_min));
child_allocation.width = CLAMP (avail, right_min, right_nat);
child_allocation.x = allocation->x + allocation->width - child_allocation.width;
gtk_widget_size_allocate (right, &child_allocation);
gtk_widget_get_clip (right, &child_clip);
gdk_rectangle_union (&clip, &clip, &child_clip);
right_size = child_allocation.width;
right_size = CLAMP (avail, right_min, right_nat);
right_expand = gtk_widget_get_hexpand (right);
}
child_allocation.y = allocation->y;
child_allocation.height = allocation->height;
if (self->center_widget)
{
child_allocation.width = center_size;
@ -231,11 +230,57 @@ gtk_center_box_size_allocate (GtkWidget *widget,
child_allocation.x = left_size;
else if (allocation->width - right_size < child_allocation.x + child_allocation.width)
child_allocation.x = allocation->width - child_allocation.width - right_size;
else if (center_expand)
{
child_allocation.width = allocation->width - 2 * MAX (left_size, right_size);
child_allocation.x = (allocation->width / 2) - (child_allocation.width / 2);
}
child_allocation.x += allocation->x;
gtk_widget_size_allocate (self->center_widget, &child_allocation);
gtk_widget_get_clip (self->center_widget, &child_clip);
gdk_rectangle_union (&clip, &clip, &child_clip);
if (left_expand)
left_size = child_allocation.x - allocation->x;
if (right_expand)
right_size = allocation->x + allocation->width - (child_allocation.x + child_allocation.width);
}
else
{
avail = allocation->width - (left_size + right_size);
if (left_expand && right_expand)
{
left_size += avail / 2;
right_size += avail / 2;
}
else if (left_expand)
{
left_size += avail;
}
else if (right_expand)
{
right_size += avail;
}
}
if (left)
{
child_allocation.width = left_size;
child_allocation.x = allocation->x;
gtk_widget_size_allocate (left, &child_allocation);
gtk_widget_get_clip (left, &child_clip);
gdk_rectangle_union (&clip, &clip, &child_clip);
}
if (right)
{
child_allocation.width = right_size;
child_allocation.x = allocation->x + allocation->width - child_allocation.width;
gtk_widget_size_allocate (right, &child_allocation);
gtk_widget_get_clip (right, &child_clip);
gdk_rectangle_union (&clip, &clip, &child_clip);
}
gtk_widget_set_clip (widget, &clip);