Clean up Dragger.

1 files changed, 31 insertions, 12 deletions

diff --git a/c/layout.h b/c/layout.h
index 1b78945..47702c4 100644
--- a/c/layout.h
+++ b/c/layout.h
@@ -9,19 +9,39 @@
 
 void UpdateLayout(int w = 0, int h = 0);
 
+/* Draggable portions of the client area, such as the split between
+ * two list views, are implemented in Dragger singletons.
+ *
+ * HandleDown and HandleMove are called by the relevant window
+ * procedures for WM_(NC)LBUTTONDOWN and WM_SETCURSOR. */
+
 struct Dragger
 {
 	bool HandleDown();
 	bool HandleMove();
-private:
-	bool InDragArea(int x, int y);
+protected:
 	bool IsDown();
 	bool IsDouble();
-	void Drag(int x, int y);
+	virtual bool InDragArea(int x, int y);
+	virtual void Drag(int x, int y);
+	virtual void Reset();
+	virtual void Done();
+private:
 	bool m_bActive = false;
 	long m_time = 0;
 };
 
+/* Dragger for data list view (upper border). */
+
+struct DlvDragger : public Dragger
+{
+private:
+	bool InDragArea(int x, int y) override;
+	void Drag(int x, int y) override;
+	void Reset() override;
+	void Done() override;
+};
+
 inline bool Dragger::IsDouble()
 {
 	const long time = GetMessageTime();
@@ -43,13 +63,12 @@ inline bool Dragger::HandleDown()
 	if (!InDragArea(pt.x, pt.y)) return false;
 
 	if (IsDouble()) {
-		extern DataListView* g_dlv;
-		g_dlv->SetHeight(0);
-		Pl("cfg","set_dlv_height",0);
-		UpdateLayout();
-		return false;
+		m_bActive = false;
+		Reset();
 	} else
-		return m_bActive = true;
+		m_bActive = true;
+
+	return m_bActive;
 }
 
 inline bool Dragger::HandleMove()
@@ -64,12 +83,12 @@ inline bool Dragger::HandleMove()
 		SetCursor(g_hcSizeNs);
 	else
 		r = false;
-	if (!m_bActive) return r;
+	if (!m_bActive)
+		return r;
 	Drag(pt.x, pt.y);
 	if (!IsDown()) {
-		extern DataListView* g_dlv;
 		m_bActive = false;
-		Pl("cfg","set_dlv_height",g_dlv->Height());
+		Done();
 	}
 	return r;
 }