Add a persistent view size attribute to List

[libs/gltk.git] / source / layout.cpp

diff --git a/source/layout.cpp b/source/layout.cpp
index c616ff6fc7caff9833070cf1c30e7c7710e20ad9..743b30ebf3263b7246659191aeca349906623513 100644 (file)
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -213,7 +213,7 @@ void Layout::update_slot_indices()
        n_active_slots = 0;
        for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
        {
-               if((*i)->widget.is_visible())
+               if((*i)->widget.is_visible() || (*i)->ghost)
                        (*i)->index = n_active_slots++;
                else
                        (*i)->index = -1;
@@ -295,6 +295,19 @@ void Layout::set_expand(Widget &wdg, bool h, bool v)
        update();
 }
 
+void Layout::set_ghost(Widget &wdg, bool g)
+{
+       Slot &slot = get_slot_for_widget(wdg);
+
+       slot.ghost = g;
+
+       if(!wdg.is_visible())
+       {
+               update_slot_indices();
+               update();
+       }
+}
+
 void Layout::update()
 {
        solve_constraints(HORIZONTAL, UPDATE);
@@ -444,7 +457,8 @@ Layout::Packing::Packing():
 Layout::Slot::Slot(Layout &l, Widget &w):
        layout(l),
        index(0),
-       widget(w)
+       widget(w),
+       ghost(false)
 {
        vert_pack.gravity = 1;
        widget.signal_autosize_changed.connect(sigc::mem_fun(this, &Slot::autosize_changed));
@@ -458,7 +472,7 @@ void Layout::Slot::autosize_changed()
        widget.autosize();
        autosize_geom = widget.get_geometry();
 
-       if(!widget.is_visible())
+       if(!widget.is_visible() && !ghost)
                return;
 
        // If the widget fits in the area it had, just leave it there.
@@ -474,7 +488,7 @@ void Layout::Slot::autosize_changed()
 void Layout::Slot::visibility_changed(bool v)
 {
        layout.update_slot_indices();
-       if(v)
+       if(v || ghost)
        {
                layout.container->signal_autosize_changed.emit();
                layout.update();
@@ -530,6 +544,7 @@ Layout::WidgetLoader::WidgetLoader(Layout &l, Widget &w, const Layout::Loader::W
 {
        add("constraint", &WidgetLoader::constraint);
        add("expand",     &WidgetLoader::expand);
+       add("ghost",      &WidgetLoader::ghost);
        add("gravity",    &WidgetLoader::gravity);
 }
 
@@ -544,6 +559,11 @@ void Layout::WidgetLoader::expand(bool h, bool v)
        layout.set_expand(widget, h, v);
 }
 
+void Layout::WidgetLoader::ghost(bool g)
+{
+       layout.set_ghost(widget, g);
+}
+
 void Layout::WidgetLoader::gravity(int h, int v)
 {
        layout.set_gravity(widget, h, v);