ShowScrollBar function; fix #165.

Author: rodrigocfd

README.md

@@ -25,7 +25,7 @@ WinSafe documentation:
 
 | Native FFI item | Count |
 | - | -: |
-| Functions | 900 |
+| Functions | 901 |
 | Structs | 263 |
 | Constants | 15,099 |
 | Window messages | 684 |

src/user/co/consts.rs

@@ -2297,8 +2297,9 @@ const_ordinary! { SB_REQ: u16;
 const_ordinary! { SBB: i32;
 	/// [`HWND::EnableScrollBar`](crate::HWND::EnableScrollBar),
 	/// [`HWND::GetScrollInfo`](crate::HWND::GetScrollInfo),
-	/// [`HWND::SetScrollInfo`](crate::HWND::SetScrollInfo) and
-	/// [`HWND::SetScrollRange`](crate::HWND::SetScrollRange) `bar` (`i32`).
+	/// [`HWND::SetScrollInfo`](crate::HWND::SetScrollInfo),
+	/// [`HWND::SetScrollRange`](crate::HWND::SetScrollRange) and
+	/// [`HWND::ShowScrollBar`](crate::HWND::ShowScrollBar) `bar` (`i32`).
 	///
 	/// Originally has `SB` prefix.
 	=>

src/user/ffi.rs

@@ -269,6 +269,7 @@ extern_sys! { "user32";
 	ShowCaret(HANDLE) -> BOOL
 	ShowCursor(BOOL) -> i32
 	ShowOwnedPopups(HANDLE, BOOL) -> BOOL
+	ShowScrollBar(HANDLE, i32, BOOL) -> BOOL
 	ShowWindow(HANDLE, i32) -> BOOL
 	ShowWindowAsync(HANDLE, i32) -> BOOL
 	ShutdownBlockReasonCreate(HANDLE, PCSTR) -> BOOL

src/user/handles/hwnd.rs

@@ -1510,6 +1510,12 @@ impl HWND {
 		unsafe { ffi::SetScrollInfo(self.ptr(), bar.raw(), pcvoid(si), redraw as _) }
 	}
 
+	/// [`ShowScrollBar`](https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-showscrollbar)
+	/// function.
+	pub fn ShowScrollBar(&self, bar: co::SBB, show: bool) -> SysResult<()> {
+		BoolRet(unsafe { ffi::ShowScrollBar(self.ptr(), bar.raw(), show as _) }).to_sysresult()
+	}
+
 	/// [`SetScrollPos`](https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setscrollpos)
 	/// function.
 	pub fn SetScrollPos(&self, b: co::SBB, pos: i32, redraw: bool) -> SysResult<i32> {