X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=blobdiff_plain;f=source%2Flayout.cpp;h=02e1ec4479dd17643dbbc8056b8b578c8bac0adb;hp=5df7bc1f77d2a16f87a02f80e4eea6892a2d3564;hb=deebbb5d23f7bdad0e25fe7eeb0a3e5a4eaf761f;hpb=729cb06f85e2888a7ac1e72375380257936106c9

diff --git a/source/layout.cpp b/source/layout.cpp
index 5df7bc1..02e1ec4 100644
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -211,22 +211,31 @@ void Layout::remove_widget(Widget &wdg)
 void Layout::update_slot_indices()
 {
 	n_active_slots = 0;
+	unsigned n_floating = 0;
 	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
 	{
 		if((*i)->widget.is_visible() || (*i)->ghost)
+		{
 			(*i)->index = n_active_slots++;
+			if((*i)->floating)
+				++n_floating;
+		}
 		else
 			(*i)->index = -1;
 	}
 
-	n_slack_vars[0] = 0;
-	n_slack_vars[1] = 0;
+	n_slack_vars[0] = n_floating*2;
+	n_slack_vars[1] = n_floating*2;
 	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
 		if((*i)->index>=0)
 		{
-			for(unsigned j=0; j<2; ++j)
-				if(((*i)->*(pointers[j].packing)).gravity==0)
-					n_slack_vars[j] += 2;
+			if(!(*i)->floating)
+			{
+				for(unsigned j=0; j<2; ++j)
+					if(((*i)->*(pointers[j].packing)).gravity==0)
+						n_slack_vars[j] += 2;
+			}
+
 			for(list<Constraint>::iterator j=(*i)->constraints.begin(); j!=(*i)->constraints.end(); ++j)
 				if(j->target.index>(*i)->index && (j->type&SLACK))
 					++n_slack_vars[j->type&1];
@@ -312,6 +321,16 @@ void Layout::set_ghost(Widget &wdg, bool g)
 	}
 }
 
+void Layout::set_floating(Widget &wdg, bool f)
+{
+	Slot &slot = get_slot_for_widget(wdg);
+
+	slot.floating = f;
+
+	update_slot_indices();
+	update();
+}
+
 void Layout::update()
 {
 	solve_constraints(HORIZONTAL, UPDATE);
@@ -358,7 +377,8 @@ void Layout::solve_constraints(int dir, SolveMode mode)
 		}
 		else
 		{
-			objective[(*i)->index*5] = ((*i)->*(ptrs.packing)).gravity/weight;
+			if(!(*i)->floating)
+				objective[(*i)->index*5] = ((*i)->*(ptrs.packing)).gravity/weight;
 			objective[(*i)->index*5+1] = (((*i)->*(ptrs.packing)).expand ? weight : -1);
 		}
 
@@ -380,18 +400,24 @@ void Layout::solve_constraints(int dir, SolveMode mode)
 			row.back() = geom.*(ptrs.dim)-margin.*(ptrs.high_margin);
 		}
 
-		if(((*i)->*(ptrs.packing)).gravity==0)
+		if((*i)->floating || ((*i)->*(ptrs.packing)).gravity==0)
 		{
-			/* Try to keep the widget as close to the center of the container
-			as possible.  Since linear programs can't express absolute values
-			directly, use two opposing slack variables that are optimized for
-			a low value. */
+			/* Try to keep the widget as close to a target position as possible.
+			Since linear programs can't express absolute values directly, use two
+			opposing slack variables that are optimized for a low value. */
+			float a = ((*i)->*(ptrs.packing)).gravity*0.5+0.5;
 			LinearProgram::Row row = linprog.add_row();
 			row[(*i)->index*5] = 1;
-			row[(*i)->index*5+1] = 0.5;
+			row[(*i)->index*5+1] = a;
 			row[k] = 1;
 			row[k+1] = -1;
-			row.back() = geom.*(ptrs.dim)/2;
+			if((*i)->floating)
+			{
+				const Geometry &cgeom = (*i)->widget.get_geometry();
+				row.back() = cgeom.*(ptrs.pos)+cgeom.*(ptrs.dim)*a;
+			}
+			else
+				row.back() = geom.*(ptrs.dim)/2;
 			objective[k] = -1;
 			objective[k+1] = -1;
 			k += 2;
@@ -470,7 +496,8 @@ Layout::Slot::Slot(Layout &l, Widget &w):
 	layout(l),
 	index(0),
 	widget(w),
-	ghost(false)
+	ghost(false),
+	floating(false)
 {
 	vert_pack.gravity = 1;
 	widget.signal_autosize_changed.connect(sigc::mem_fun(this, &Slot::autosize_changed));