From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 16 Jun 2013 19:59:20 +0000 (+0300)
Subject: Add a packing attribute to consider a widget even if it's hidden
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=72db2a8d41cc0eb8404572d1a720d59fab0551cd

Add a packing attribute to consider a widget even if it's hidden
---

diff --git a/source/layout.cpp b/source/layout.cpp
index c616ff6..743b30e 100644
--- 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);
diff --git a/source/layout.h b/source/layout.h
index b8c4edd..a8ea3bf 100644
--- a/source/layout.h
+++ b/source/layout.h
@@ -119,6 +119,7 @@ private:
 	private:
 		void constraint(ConstraintType, const std::string &);
 		void expand(bool, bool);
+		void ghost(bool);
 		void gravity(int, int);
 	};
 
@@ -151,6 +152,7 @@ private:
 		std::list<Constraint> constraints;
 		Packing horiz_pack;
 		Packing vert_pack;
+		bool ghost;
 
 		Slot(Layout &, Widget &);
 
@@ -220,6 +222,9 @@ public:
 	void set_gravity(Widget &, int, int);
 	void set_expand(Widget &, bool, bool);
 
+	/// Sets a widget as a ghost, taking up space even if it is hidden.
+	void set_ghost(Widget &, bool);
+
 	void update();
 	void autosize();
 
diff --git a/source/panel.cpp b/source/panel.cpp
index 8c5dd38..930a68f 100644
--- a/source/panel.cpp
+++ b/source/panel.cpp
@@ -90,6 +90,7 @@ Panel::Loader::Loader(Panel &p, map<string, Widget *> &m):
 	add("dropdown",  &Loader::child<Dropdown>);
 	add("entry",     &Loader::child<Entry>);
 	add("expand",    &Loader::expand);
+	add("ghost",     &Loader::ghost);
 	add("gravity",   &Loader::gravity);
 	add("grid",      &Loader::grid);
 	add("hslider",   &Loader::child<HSlider>);
@@ -148,6 +149,11 @@ void Panel::Loader::expand(bool h, bool v)
 	get_layout().set_expand(get_last_widget(), h, v);
 }
 
+void Panel::Loader::ghost(bool g)
+{
+	get_layout().set_ghost(get_last_widget(), g);
+}
+
 void Panel::Loader::gravity(int h, int v)
 {
 	get_layout().set_gravity(get_last_widget(), h, v);
diff --git a/source/panel.h b/source/panel.h
index 79e8bd4..ee2859c 100644
--- a/source/panel.h
+++ b/source/panel.h
@@ -35,6 +35,7 @@ public:
 		void child(const std::string &);
 		void constraint(Layout::ConstraintType, const std::string &);
 		void expand(bool, bool);
+		void ghost(bool);
 		void gravity(int, int);
 		void grid(unsigned);
 		void layout();