Give the area an id.

headers/libs/alm/ALMLayout.h

@@ -65,6 +65,7 @@ public:
 			void				SetSpacing(float spacing);
 			float				Spacing() const;
 
+			Area*				AreaFor(int32 id) const;
 			Area*				AreaFor(const BView* view) const;
 			Area*				AreaFor(const BLayoutItem* item) const;
 			int32				CountAreas() const;

headers/libs/alm/Area.h

@@ -65,6 +65,9 @@ class Area {
 public:
 								~Area();
 
+			int32				ID() const;
+			void				SetID(int32 id);
+
 			BLayoutItem*		Item();
 
 			XTab*				Left() const;
@@ -121,6 +124,7 @@ private:
 			void				_UpdateMaxSizeConstraint(BSize max);
 private:
 			BLayoutItem*		fLayoutItem;
+			int32				fID;
 
 			LinearSpec*			fLS;
 

src/libs/alm/ALMLayout.cpp

@@ -208,6 +208,19 @@ BALMLayout::AddColumn(XTab* _left, XTab* _right)
 }
 
 
+Area*
+BALMLayout::AreaFor(int32 id) const
+{
+	int32 areaCount = CountAreas();
+	for (int32 i = 0; i < areaCount; i++) {
+		Area* area = AreaAt(i);
+		if (area->ID() == id)
+			return area;
+	}
+	return NULL;
+}
+
+
 /**
  * Finds the area that contains the given control.
  *

src/libs/alm/Area.cpp

@@ -522,6 +522,15 @@ Area::~Area()
 }
 
 
+static int32 sAreaID = 0;
+
+static int32
+new_area_id()
+{
+	return sAreaID++;
+}
+
+
 /**
  * Constructor.
  * Uses XTabs and YTabs.
@@ -550,7 +559,21 @@ Area::Area(BLayoutItem* item)
 	fContentAspectRatio(-1),
 	fContentAspectRatioC(NULL)
 {
+	fID = new_area_id();
+}
 
+
+int32
+Area::ID() const
+{
+	return fID;
+}
+
+
+void
+Area::SetID(int32 id)
+{
+	fID = id;
 }