Simplify UpdateLayout.

1 files changed, 23 insertions, 2 deletions

diff --git a/c/common.h b/c/common.h
index 01083b8..0343914 100644
--- a/c/common.h
+++ b/c/common.h
@@ -56,7 +56,7 @@ std::optional<T> maybe_make(U... xs)
 
 /* Call Windows API function, throwing error on NULL. */
 template <typename T>
-inline T require(T x)
+inline T require(const T x)
 {
 	if (!x) throw Win32Error();
 	return x;
@@ -64,7 +64,7 @@ inline T require(T x)
 
 /* Call Windows API function, showing a warning on NULL. */
 template <typename T>
-inline T prefer(T x)
+inline T prefer(const T x)
 {
 	if (!x) {
 		EBMessageBox(Win32Error().what<TCHAR>(),
@@ -88,4 +88,25 @@ inline int Cmp(const int a, const int b)
 	return -1;
 }
 
+/* Get window rectangle relative to parent. */
+inline BOOL GetRelativeRect(const HWND hWnd, RECT* const pRr)
+{
+	if (!GetClientRect(hWnd, pRr)) return 0;
+	return MapWindowPoints(hWnd, GetParent(hWnd), (POINT*)pRr, 2);
+}
+
+inline BOOL SetWindowRect(const HWND hWnd,
+    const long left, const long top, const long right, const long bottom)
+{
+	return MoveWindow(hWnd,
+	    left, top,
+	    right-left, bottom-top,
+	    TRUE);
+}
+
+inline BOOL SetWindowRect(const HWND hWnd, const RECT r)
+{
+	return SetWindowRect(hWnd, r.left, r.top, r.right, r.bottom);
+}
+
 #endif