From fed19b9942575e7c0360a0d77a3c544afdbaeb6c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Tue, 15 Feb 2022 02:29:01 +0100
Subject: Update layout on column width change.

---
 win.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 52 insertions(+), 19 deletions(-)

diff --git a/win.c b/win.c
index e675f63..6f82645 100644
--- a/win.c
+++ b/win.c
@@ -11,12 +11,17 @@
 
 HFONT g_GUIFont;
 HFONT g_GUIFontBold;
+WNDPROC g_PrevLvProc;
+
 int g_SelectedItem = -1;	/* Remembered after refresh. */
 
 static LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 static INT_PTR CALLBACK AboutDlgProc(HWND, UINT, WPARAM, LPARAM);
+static LRESULT CALLBACK LvProc(HWND, UINT, WPARAM, LPARAM);
+
 static void CreateListView(HWND);
 static LRESULT HandleListViewNotify(HWND, LPARAM);
+static void UpdateLayout(HWND);
 
 static void SetupFonts();
 static TCHAR *TSZFromSZ(char *, int);
@@ -128,25 +133,7 @@ WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 		CreateListView(hWnd);
 		break;
 	case WM_SIZE:
-		{
-			HWND hListView;
-			int cxColumn;
-			RECT rc;
-			static int cxVScroll = 0;
-
-			if (cxVScroll == 0)
-				cxVScroll = GetSystemMetrics(SM_CXVSCROLL);
-
-			GetClientRect(hWnd, &rc);
-			hListView = GetDlgItem(hWnd, IDC_LISTVIEW);
-			MoveWindow(hListView, 0, 0,
-				rc.right, rc.bottom,
-				TRUE);
-
-			cxColumn = ListView_GetColumnWidth(hListView, 0);
-			ListView_SetColumnWidth(hListView, 1,
-				rc.right-cxColumn-cxVScroll);
-		}
+		UpdateLayout(hWnd);
 		break;
 	case WM_NOTIFY:
 		switch (((NMHDR *)lParam)->idFrom) {
@@ -184,6 +171,25 @@ AboutDlgProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 	return TRUE;
 }
 
+LRESULT CALLBACK
+LvProc(HWND hListView, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+	switch (uMsg) {
+	case WM_NOTIFY:
+		switch (((NMHDR *)lParam)->code) {
+		case HDN_ENDTRACK:
+			UpdateLayout(GetParent(hListView));
+			return TRUE;
+		}
+		break;
+	}
+
+	return CallWindowProc(g_PrevLvProc,
+		hListView, uMsg, wParam, lParam);
+}
+
+/***/
+
 void
 CreateListView(HWND hWnd)
 {
@@ -203,6 +209,9 @@ CreateListView(HWND hWnd)
 		NULL
 	);
 
+	g_PrevLvProc = (WNDPROC)SetWindowLongPtr(hListView,
+		GWLP_WNDPROC, (LONG_PTR)LvProc);
+
 	SendMessage(hListView, WM_SETFONT,
 		(WPARAM)g_GUIFont, MAKELPARAM(FALSE, 0));
 
@@ -272,6 +281,30 @@ HandleListViewNotify(HWND hWnd, LPARAM lParam)
 	return 0;
 }
 
+void
+UpdateLayout(HWND hWnd)
+{
+	HWND hListView;
+	int cxColumn;
+	RECT rc;
+	static int cxVScroll = 0;
+
+	if (cxVScroll == 0)
+		cxVScroll = GetSystemMetrics(SM_CXVSCROLL);
+
+	GetClientRect(hWnd, &rc);
+	hListView = GetDlgItem(hWnd, IDC_LISTVIEW);
+	MoveWindow(hListView, 0, 0,
+		rc.right, rc.bottom,
+		TRUE);
+
+	cxColumn = ListView_GetColumnWidth(hListView, 0);
+	ListView_SetColumnWidth(hListView, 1,
+		rc.right-cxColumn-cxVScroll);
+
+	ListView_EnsureVisible(hListView, g_SelectedItem, TRUE);
+}
+
 /***/
 
 void
-- 
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