From 22f43e526b4c7120937e285471b5a4f92ceb55fb Mon Sep 17 00:00:00 2001
From: thearturca <arti.1046@gmail.com>
Date: Sat, 10 May 2025 16:33:26 +0300
Subject: [PATCH] refactor(animations): adds windows-api calls to improve
 resize behaviour of apps

---
 komorebi/src/window.rs      | 13 +++++++++++--
 komorebi/src/windows_api.rs | 22 ++++++++++++++++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/komorebi/src/window.rs b/komorebi/src/window.rs
index 3434203f..dc99aabc 100644
--- a/komorebi/src/window.rs
+++ b/komorebi/src/window.rs
@@ -59,6 +59,7 @@ use std::time::Duration;
 use strum::Display;
 use strum::EnumString;
 use windows::Win32::Foundation::HWND;
+use windows::Win32::Graphics::Dwm::DwmFlush;
 
 pub static MINIMUM_WIDTH: AtomicI32 = AtomicI32::new(0);
 pub static MINIMUM_HEIGHT: AtomicI32 = AtomicI32::new(0);
@@ -196,6 +197,8 @@ impl RenderDispatcher for MovementRenderDispatcher {
         stackbar_manager::STACKBAR_TEMPORARILY_DISABLED.store(true, Ordering::SeqCst);
         stackbar_manager::send_notification();
 
+        WindowsApi::send_enter_size_move(self.hwnd)?;
+
         Ok(())
     }
 
@@ -204,9 +207,14 @@ impl RenderDispatcher for MovementRenderDispatcher {
 
         // we don't check WINDOW_HANDLING_BEHAVIOUR here because animations
         // are always run on a separate thread
-        WindowsApi::move_window(self.hwnd, &new_rect, false)?;
-        WindowsApi::invalidate_rect(self.hwnd, None, false);
+        WindowsApi::move_window(self.hwnd, &new_rect, true)?;
 
+        // force window redraw
+        WindowsApi::invalidate_rect(self.hwnd, None, true);
+        WindowsApi::update_window(self.hwnd);
+
+        // wait for dwm to flush render queue
+        unsafe { DwmFlush() }?;
         Ok(())
     }
 
@@ -214,6 +222,7 @@ impl RenderDispatcher for MovementRenderDispatcher {
         // we don't add the async_window_pos flag here because animations
         // are always run on a separate thread
         WindowsApi::position_window(self.hwnd, &self.target_rect, self.top, false)?;
+        WindowsApi::send_exit_size_move(self.hwnd)?;
         if ANIMATION_MANAGER
             .lock()
             .count_in_progress(MovementRenderDispatcher::PREFIX)
diff --git a/komorebi/src/windows_api.rs b/komorebi/src/windows_api.rs
index 326c4d5b..74c7a246 100644
--- a/komorebi/src/windows_api.rs
+++ b/komorebi/src/windows_api.rs
@@ -47,6 +47,7 @@ use windows::Win32::Graphics::Gdi::MonitorFromPoint;
 use windows::Win32::Graphics::Gdi::MonitorFromWindow;
 use windows::Win32::Graphics::Gdi::Rectangle;
 use windows::Win32::Graphics::Gdi::RoundRect;
+use windows::Win32::Graphics::Gdi::UpdateWindow;
 use windows::Win32::System::Com::CLSCTX_ALL;
 use windows::Win32::System::Com::CoCreateInstance;
 use windows::Win32::System::LibraryLoader::GetModuleHandleW;
@@ -128,6 +129,7 @@ use windows::Win32::UI::WindowsAndMessaging::SWP_NOSIZE;
 use windows::Win32::UI::WindowsAndMessaging::SWP_SHOWWINDOW;
 use windows::Win32::UI::WindowsAndMessaging::SYSTEM_PARAMETERS_INFO_ACTION;
 use windows::Win32::UI::WindowsAndMessaging::SYSTEM_PARAMETERS_INFO_UPDATE_FLAGS;
+use windows::Win32::UI::WindowsAndMessaging::SendMessageW;
 use windows::Win32::UI::WindowsAndMessaging::SetCursorPos;
 use windows::Win32::UI::WindowsAndMessaging::SetForegroundWindow;
 use windows::Win32::UI::WindowsAndMessaging::SetLayeredWindowAttributes;
@@ -138,6 +140,8 @@ use windows::Win32::UI::WindowsAndMessaging::ShowWindowAsync;
 use windows::Win32::UI::WindowsAndMessaging::SystemParametersInfoW;
 use windows::Win32::UI::WindowsAndMessaging::WINDOW_LONG_PTR_INDEX;
 use windows::Win32::UI::WindowsAndMessaging::WM_CLOSE;
+use windows::Win32::UI::WindowsAndMessaging::WM_ENTERSIZEMOVE;
+use windows::Win32::UI::WindowsAndMessaging::WM_EXITSIZEMOVE;
 use windows::Win32::UI::WindowsAndMessaging::WNDCLASSW;
 use windows::Win32::UI::WindowsAndMessaging::WNDENUMPROC;
 use windows::Win32::UI::WindowsAndMessaging::WS_DISABLED;
@@ -1387,6 +1391,24 @@ impl WindowsApi {
         unsafe { InvalidateRect(Option::from(HWND(as_ptr!(hwnd))), rect, erase) }.as_bool()
     }
 
+    pub fn send_enter_size_move(hwnd: isize) -> eyre::Result<()> {
+        unsafe {
+            SendMessageW(HWND(as_ptr!(hwnd)), WM_ENTERSIZEMOVE, None, None);
+            Ok(())
+        }
+    }
+
+    pub fn send_exit_size_move(hwnd: isize) -> eyre::Result<()> {
+        unsafe {
+            SendMessageW(HWND(as_ptr!(hwnd)), WM_EXITSIZEMOVE, None, None);
+            Ok(())
+        }
+    }
+
+    pub fn update_window(hwnd: isize) -> bool {
+        unsafe { UpdateWindow(HWND(as_ptr!(hwnd))) }.as_bool()
+    }
+
     pub fn alt_is_pressed() -> bool {
         let state = unsafe { GetKeyState(i32::from(VK_MENU.0)) };
         #[allow(clippy::cast_sign_loss)]