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widget: Give some meaning to "visible"

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GtkWidget::visible is required for the widget to:
- have a preferred size other than 0/0
- have a size allocated
- return other values than { -1, -1, 1, 1 } from get_allocation()

This is an experimental patch aiming to make concepts and behaviors
inside GTK more concreate. GtkWidget::visible is now essentially what
CSS does for "display: none".

Note that if you want the effect of CSS's "visibility: hidden", you'll
have to use a GtkNotebook with an empty page as the concept of reserving
space but not drawing anything isn't supported natively in GTK.
This commit is contained in:
Benjamin Otte 2013-01-08 14:56:02 +01:00
parent 9be7e3e2d8
commit b495ce5446
1 changed files with 18 additions and 1 deletions
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19
gtk/gtkwidget.c
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@ -4817,6 +4817,12 @@ gtk_widget_size_allocate (GtkWidget *widget,
g_return_if_fail (GTK_IS_WIDGET (widget));
if (!priv->visible)
{
g_print ("woot, invisible widget allocated!\n");
return;
}
gtk_widget_push_verify_invariants (widget);
#ifdef G_ENABLE_DEBUG
@ -7494,7 +7500,17 @@ void
_gtk_widget_set_visible_flag (GtkWidget *widget,
gboolean visible)
{
widget->priv->visible = visible;
GtkWidgetPrivate *priv = widget->priv;
priv->visible = visible;
if (!visible)
{
priv->allocation.x = -1;
priv->allocation.y = -1;
priv->allocation.width = 1;
priv->allocation.height = 1;
}
}
/**
@ -13513,6 +13529,7 @@ gtk_widget_set_allocation (GtkWidget *widget,
GtkWidgetPrivate *priv;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (gtk_widget_get_visible (widget));
g_return_if_fail (allocation != NULL);
priv = widget->priv;