fix(komorebi): restore borders, no more DWM border on border window

This fixes a regression from an earlier commit that dropped the DWM
style borders without fixing corner rounding on Windows 11. This is now
fixed for Windows 11 again, while avoiding the extra system border
decorations.

komorebi/src/border.rs

@@ -17,8 +17,8 @@ use crate::WindowsApi;
 use crate::BORDER_HWND;
 use crate::BORDER_OFFSET;
 use crate::BORDER_RECT;
+use crate::BORDER_WIDTH;
 use crate::TRANSPARENCY_COLOUR;
-use crate::WINDOWS_11;
 
 #[derive(Debug, Clone, Copy)]
 pub struct Border {
@@ -75,10 +75,6 @@ impl Border {
 
  BORDER_HWND.store(hwnd.0, Ordering::SeqCst);
 
- if *WINDOWS_11 {
- WindowsApi::round_corners(hwnd.0)?;
- }
-
  Ok(())
  }
 
@@ -112,6 +108,13 @@ impl Border {
  rect.bottom += border_offset.bottom;
  }
 
+ let border_width = BORDER_WIDTH.load(Ordering::SeqCst);
+
+ rect.left -= border_width;
+ rect.top -= border_width;
+ rect.right += border_width * 2;
+ rect.bottom += border_width * 2;
+
  *BORDER_RECT.lock() = rect;
 
  WindowsApi::position_border_window(self.hwnd(), &rect, activate)

komorebi/src/windows_api.rs

@@ -129,8 +129,7 @@ use windows::Win32::UI::WindowsAndMessaging::WS_DISABLED;
 use windows::Win32::UI::WindowsAndMessaging::WS_EX_LAYERED;
 use windows::Win32::UI::WindowsAndMessaging::WS_EX_NOACTIVATE;
 use windows::Win32::UI::WindowsAndMessaging::WS_EX_TOOLWINDOW;
-use windows::Win32::UI::WindowsAndMessaging::WS_MAXIMIZEBOX;
-use windows::Win32::UI::WindowsAndMessaging::WS_MINIMIZEBOX;
+use windows::Win32::UI::WindowsAndMessaging::WS_EX_TOPMOST;
 use windows::Win32::UI::WindowsAndMessaging::WS_POPUP;
 use windows::Win32::UI::WindowsAndMessaging::WS_SYSMENU;
 
@@ -858,10 +857,10 @@ impl WindowsApi {
  pub fn create_border_window(name: PCWSTR, instance: HMODULE) -> Result<isize> {
  unsafe {
  let hwnd = CreateWindowExW(
- WS_EX_TOOLWINDOW | WS_EX_LAYERED,
+ WS_EX_TOOLWINDOW | WS_EX_LAYERED | WS_EX_TOPMOST | WS_EX_NOACTIVATE,
  name,
  name,
- WS_POPUP | WS_SYSMENU | WS_MAXIMIZEBOX | WS_MINIMIZEBOX,
+ WS_POPUP | WS_SYSMENU,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,

komorebi/src/windows_callbacks.rs

@@ -13,11 +13,13 @@ use windows::Win32::Graphics::Gdi::BeginPaint;
 use windows::Win32::Graphics::Gdi::CreatePen;
 use windows::Win32::Graphics::Gdi::EndPaint;
 use windows::Win32::Graphics::Gdi::Rectangle;
+use windows::Win32::Graphics::Gdi::RoundRect;
 use windows::Win32::Graphics::Gdi::SelectObject;
 use windows::Win32::Graphics::Gdi::ValidateRect;
 use windows::Win32::Graphics::Gdi::HDC;
 use windows::Win32::Graphics::Gdi::HMONITOR;
 use windows::Win32::Graphics::Gdi::PAINTSTRUCT;
+use windows::Win32::Graphics::Gdi::PS_INSIDEFRAME;
 use windows::Win32::Graphics::Gdi::PS_SOLID;
 use windows::Win32::UI::Accessibility::HWINEVENTHOOK;
 use windows::Win32::UI::WindowsAndMessaging::DefWindowProcW;
@@ -44,6 +46,7 @@ use crate::BORDER_WIDTH;
 use crate::DISPLAY_INDEX_PREFERENCES;
 use crate::MONITOR_INDEX_PREFERENCES;
 use crate::TRANSPARENCY_COLOUR;
+use crate::WINDOWS_11;
 
 pub extern "system" fn valid_display_monitors(
  hmonitor: HMONITOR,
@@ -211,15 +214,25 @@ pub extern "system" fn border_window(
  let mut ps = PAINTSTRUCT::default();
  let hdc = BeginPaint(window, &mut ps);
  let hpen = CreatePen(
- PS_SOLID,
+ PS_SOLID | PS_INSIDEFRAME,
  BORDER_WIDTH.load(Ordering::SeqCst),
  COLORREF(BORDER_COLOUR_CURRENT.load(Ordering::SeqCst)),
  );
  let hbrush = WindowsApi::create_solid_brush(TRANSPARENCY_COLOUR);
 
  SelectObject(hdc, hpen);
  SelectObject(hdc, hbrush);
- Rectangle(hdc, 0, 0, border_rect.right, border_rect.bottom);
+ // TODO(raggi): this is approximately the correct curvature for
+ // the top left of a Windows 11 window (DWMWCP_DEFAULT), but
+ // often the bottom right has a different shape. Furthermore if
+ // the window was made with DWMWCP_ROUNDSMALL then this is the
+ // wrong size. In the future we should read the DWM properties
+ // of windows and attempt to match appropriately.
+ if *WINDOWS_11 {
+ RoundRect(hdc, 0, 0, border_rect.right, border_rect.bottom, 14, 14);
+ } else {
+ Rectangle(hdc, 0, 0, border_rect.right, border_rect.bottom);
+ }
  EndPaint(window, &ps);
  ValidateRect(window, None);