From c0174806a7c59cdbac1cd941d66e844e55829444 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Tue, 2 Aug 2022 20:40:24 +0200
Subject: Double-click dragger to reset.

One cannot use WM_LBUTTONDBLCLK here, because it relies on
WM_LBUTTONDOWN being passed to the default message handler.
---
 c/layout.cpp |  3 +++
 c/layout.h   | 28 +++++++++++++++++++++++-----
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/c/layout.cpp b/c/layout.cpp
index 77aa88e..de1f1f7 100644
--- a/c/layout.cpp
+++ b/c/layout.cpp
@@ -55,6 +55,9 @@ void Dragger::Drag(const int, const int y)
 {
 	RECT rrDlv;
 	require(GetRelativeRect(g_dlv->hWnd, &rrDlv));
+
+	if (y < Dpi(50) || y > rrDlv.bottom-Dpi(20)) return;
+
 	int h;
 	h = rrDlv.bottom-y;
 	g_dlv->SetHeight(h);
diff --git a/c/layout.h b/c/layout.h
index 82189fb..5ea9c2b 100644
--- a/c/layout.h
+++ b/c/layout.h
@@ -4,6 +4,7 @@
 #include <windows.h>
 
 #include "common.h"
+#include "datalistview.h"
 
 void UpdateLayout(int w = 0, int h = 0);
 
@@ -14,22 +15,39 @@ struct Dragger
 private:
 	bool InDragArea(int x, int y);
 	bool IsDown();
+	bool IsDouble();
 	void Drag(int x, int y);
 	bool m_bActive = false;
+	long m_time = 0;
 };
 
+inline bool Dragger::IsDouble()
+{
+	const long time = GetMessageTime();
+	const bool dbl = time-m_time <= static_cast<long>(GetDoubleClickTime());
+	m_time = time;
+	return dbl;
+}
+
+inline bool Dragger::IsDown()
+{
+	return GetKeyState(VK_LBUTTON) & 0x8000;
+}
+
 inline bool Dragger::HandleDown()
 {
 	extern HWND g_hWnd;
 	POINT pt;
 	require(GetRelativeCursorPos(g_hWnd, &pt));
 	if (!InDragArea(pt.x, pt.y)) return false;
-	return m_bActive = true;
-}
 
-inline bool Dragger::IsDown()
-{
-	return GetKeyState(VK_LBUTTON) & 0x8000;
+	if (IsDouble()) {
+		extern DataListView* g_dlv;
+		g_dlv->SetHeight(0);
+		UpdateLayout();
+		return false;
+	} else
+		return m_bActive = true;
 }
 
 inline bool Dragger::HandleMove()
-- 
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