From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 15 Dec 2012 18:11:56 +0000 (+0200)
Subject: Allow specifying a custom spacing for a constraint
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=5e97c5c224c30e68c26fddd2153694088f932bee;p=libs%2Fgltk.git

Allow specifying a custom spacing for a constraint
---

diff --git a/source/layout.cpp b/source/layout.cpp
index bfe46c4..d3d015f 100644
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -203,7 +203,7 @@ Layout::ConstraintType Layout::complement(ConstraintType type)
 		return type;
 }
 
-void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt)
+void Layout::create_constraint(Widget &src, ConstraintType type, Widget &tgt, int sp)
 {
 	if(&src==&tgt)
 		throw invalid_argument("&src==&tgt");
@@ -216,11 +216,23 @@ void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt)
 			return;
 
 	src_slot.constraints.push_back(Constraint(type, tgt_slot));
+	src_slot.constraints.back().spacing = sp;
 	tgt_slot.constraints.push_back(Constraint(complement(type), src_slot));
+	tgt_slot.constraints.back().spacing = sp;
 
 	update();
 }
 
+void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt)
+{
+	create_constraint(src, type, tgt, -1);
+}
+
+void Layout::add_constraint(Widget &src, ConstraintType type, Widget &tgt, unsigned spacing)
+{
+	create_constraint(src, type, tgt, spacing);
+}
+
 void Layout::set_gravity(Widget &wdg, int h, int v)
 {
 	Slot &slot = get_slot_for_widget(wdg);
@@ -339,7 +351,7 @@ void Layout::solve_constraints(int dir, SolveMode mode)
 				if(j->type&TARGET_DIM)
 					row[j->target.index*5+1] = -1;
 				if(j->type&SPACING)
-					row.back() = this->*(ptrs.spacing);
+					row.back() = (j->spacing>=0 ? j->spacing : this->*(ptrs.spacing));
 			}
 	}
 
@@ -368,7 +380,8 @@ void Layout::solve_constraints(int dir, SolveMode mode)
 
 Layout::Constraint::Constraint(ConstraintType t, Slot &s):
 	type(t),
-	target(s)
+	target(s),
+	spacing(-1)
 { }
 
 
diff --git a/source/layout.h b/source/layout.h
index cbd763e..2303651 100644
--- a/source/layout.h
+++ b/source/layout.h
@@ -84,6 +84,7 @@ protected:
 	{
 		ConstraintType type;
 		Slot &target;
+		int spacing;
 
 		Constraint(ConstraintType, Slot &);
 	};
@@ -147,8 +148,16 @@ protected:
 	virtual Slot *create_slot(Widget &);
 	Slot &get_slot_for_widget(Widget &);
 	static ConstraintType complement(ConstraintType);
+	void create_constraint(Widget &, ConstraintType, Widget &, int);
+
 public:
-	void add_constraint(Widget &, ConstraintType, Widget &);
+	/** Adds a constraint between two widgets. */
+	void add_constraint(Widget &src, ConstraintType type, Widget &tgt);
+
+	/** Adds a constraint between two widgets, overriding the default spacing.
+	Not all constraint types use a spacing. */
+	void add_constraint(Widget &src, ConstraintType type, Widget &tgt, unsigned);
+
 	void set_gravity(Widget &, int, int);
 	void set_expand(Widget &, bool, bool);