Implement draggable split.

Next step is to allow a double click to reset the split to be
automatically resized.

1 files changed, 14 insertions, 0 deletions

diff --git a/c/common.cpp b/c/common.cpp
index 2e16c59..fcf1da2 100644
--- a/c/common.cpp
+++ b/c/common.cpp
@@ -148,3 +148,17 @@ int EBMessageBox(const wchar_t* const wszText, const wchar_t* const wszCaption,
 	require(UnhookWindowsHookEx(hHook));
 	return r;
 }
+
+int GetRelativeCursorPos(HWND hWnd, POINT* pt)
+{
+	RECT rc;
+	if (!GetClientRect(hWnd, &rc)) return 0;
+	SetLastError(ERROR_SUCCESS);
+	if (!MapWindowPoints(hWnd, NULL, (POINT*)&rc, 2)) return 0;
+
+	POINT ptMouse;
+	if (!GetCursorPos(&ptMouse)) return 0;
+	pt->x = ptMouse.x-rc.left;
+	pt->y = ptMouse.y-rc.top;
+	return 1;
+}