From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 27 Nov 2012 07:36:36 +0000 (+0200)
Subject: Store autosized geom in Layout::Slot
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=99595e939b7f5753773f36a0a8298cd837924030

Store autosized geom in Layout::Slot

This avoids having to autosize all widgets in the layout every time one of
them changes, and allows checking whether an update is actually needed.
---

diff --git a/source/layout.cpp b/source/layout.cpp
index 6cf7b34..b95ab92 100644
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -217,12 +217,6 @@ void Layout::set_expand(Widget &wdg, bool h, bool v)
 
 void Layout::update()
 {
-	for(list<Slot *>::iterator i=slots.begin(); i!=slots.end(); ++i)
-	{
-		(*i)->widget.autosize();
-		(*i)->geom = (*i)->widget.get_geometry();
-	}
-
 	solve_constraints(HORIZONTAL);
 	solve_constraints(VERTICAL);
 
@@ -268,7 +262,7 @@ void Layout::solve_constraints(int dir)
 			LinearProgram::Row row = linprog.add_row();
 			row[(*i)->index*5+1] = 1;
 			row[(*i)->index*5+4] = -1;
-			row.back() = (*i)->geom.*(ptrs.dim);
+			row.back() = (*i)->autosize_geom.*(ptrs.dim);
 		}
 
 		/* Add rows for user-defined constraints.  Below/above and left/right of
@@ -321,11 +315,20 @@ Layout::Slot::Slot(Layout &l, Widget &w):
 {
 	vert_pack.gravity = 1;
 	widget.signal_autosize_changed.connect(sigc::mem_fun(this, &Slot::autosize_changed));
+	widget.autosize();
+	autosize_geom = widget.get_geometry();
 }
 
 void Layout::Slot::autosize_changed()
 {
-	layout.update();
+	widget.autosize();
+	autosize_geom = widget.get_geometry();
+
+	// If the widget fits in the area it had, just leave it there.
+	if(autosize_geom.w<=geom.w && autosize_geom.h<=geom.h)
+		widget.set_geometry(geom);
+	else
+		layout.update();
 }
 
 
diff --git a/source/layout.h b/source/layout.h
index 582bc1b..cf63538 100644
--- a/source/layout.h
+++ b/source/layout.h
@@ -101,6 +101,7 @@ protected:
 		Layout &layout;
 		unsigned index;
 		Widget &widget;
+		Geometry autosize_geom;
 		Geometry geom;
 		std::list<Constraint> constraints;
 		Packing horiz_pack;