From 9d1c0ad7905e1509746f8d47564f3af532cb608c Mon Sep 17 00:00:00 2001
From: thearturca <arti.1046@gmail.com>
Date: Sun, 24 Sep 2023 12:37:26 +0300
Subject: [PATCH] feature: animation Commit to pull changes from master

---
 komorebi/src/animation.rs | 55 +++++++++++++++++++++++++++++++++++++++
 komorebi/src/main.rs      |  1 +
 komorebi/src/window.rs    | 28 +++++++++++++++++++-
 3 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 komorebi/src/animation.rs

diff --git a/komorebi/src/animation.rs b/komorebi/src/animation.rs
new file mode 100644
index 00000000..2e24743b
--- /dev/null
+++ b/komorebi/src/animation.rs
@@ -0,0 +1,55 @@
+use color_eyre::Result;
+use komorebi_core::Rect;
+use std::thread::sleep;
+use std::time::Duration;
+use std::time::Instant;
+
+pub struct Animation;
+
+impl Animation {
+    pub fn lerp(x: i32, new_x: i32, t: f64) -> i32 {
+        (x as f64 + (new_x - x) as f64 * t) as i32
+    }
+
+    pub fn lerp_rect(original_rect: &Rect, new_rect: &Rect, t: f64) -> Rect {
+        let is_half_way = t > 0.5;
+        let mut rect = Rect::default();
+        rect.top = Animation::lerp(original_rect.top, new_rect.top, t);
+        rect.left = Animation::lerp(original_rect.left, new_rect.left, t);
+        rect.bottom = if is_half_way {
+            new_rect.bottom
+        } else {
+            original_rect.bottom
+        };
+        rect.right = if is_half_way {
+            new_rect.right
+        } else {
+            original_rect.right
+        };
+
+        rect
+    }
+
+    pub fn animate(duration: Duration, mut f: impl FnMut(f64) -> Result<()>) -> bool {
+        let target_frame_time = Duration::from_millis(1000 / 240);
+        let mut progress = 0.0;
+        let &animation_start = &Instant::now();
+
+        while progress < 1.0 {
+            let tick_start = Instant::now();
+            f(progress).unwrap();
+            progress = animation_start.elapsed().as_millis() as f64 / duration.as_millis() as f64;
+
+            if progress > 1.0 {
+                progress = 1.0;
+            }
+
+            while tick_start.elapsed() < target_frame_time {
+                sleep(target_frame_time - tick_start.elapsed());
+            }
+        }
+
+        f(progress).unwrap();
+        true
+    }
+}
diff --git a/komorebi/src/main.rs b/komorebi/src/main.rs
index 801e23af..62f436ab 100644
--- a/komorebi/src/main.rs
+++ b/komorebi/src/main.rs
@@ -65,6 +65,7 @@ use crate::windows_api::WindowsApi;
 #[macro_use]
 mod ring;
 
+mod animation;
 mod border;
 mod com;
 mod container;
diff --git a/komorebi/src/window.rs b/komorebi/src/window.rs
index b991baac..f47f0e92 100644
--- a/komorebi/src/window.rs
+++ b/komorebi/src/window.rs
@@ -5,6 +5,8 @@ use std::fmt::Display;
 use std::fmt::Formatter;
 use std::fmt::Write as _;
 use std::sync::atomic::Ordering;
+use std::thread;
+use std::time::Duration;
 
 use color_eyre::eyre::anyhow;
 use color_eyre::Result;
@@ -25,6 +27,7 @@ use komorebi_core::ApplicationIdentifier;
 use komorebi_core::HidingBehaviour;
 use komorebi_core::Rect;
 
+use crate::animation::Animation;
 use crate::styles::ExtendedWindowStyle;
 use crate::styles::WindowStyle;
 use crate::window_manager_event::WindowManagerEvent;
@@ -122,6 +125,22 @@ impl Window {
             true,
         )
     }
+    pub fn animate_position(hwnd: HWND, layout: &Rect, top: bool) -> Result<()> {
+        let duration = Duration::from_millis(200);
+        let curr_rect = WindowsApi::window_rect(hwnd).unwrap();
+
+        if assert_eq!(curr_rect, *layout) {
+            WindowsApi::position_window(hwnd, layout, top);
+        }
+
+        let animate_window = |progress: f64| {
+            let new_rect = Animation::lerp_rect(&curr_rect, layout, progress);
+            WindowsApi::position_window(hwnd, &new_rect, top);
+        };
+
+        Animation::animate(duration, animate_window);
+        Ok(())
+    }
 
     pub fn set_position(
         &mut self,
@@ -154,7 +173,14 @@ impl Window {
             rect.bottom += invisible_borders.bottom;
         }
 
-        WindowsApi::position_window(self.hwnd(), &rect, top)
+        let hwnd = self.hwnd();
+
+        thread::spawn(move || {
+            Window::animate_position(hwnd, &rect, top).unwrap();
+        });
+        Ok(())
+
+        // WindowsApi::position_window(self.hwnd(), &rect, top)
     }
 
     pub fn hide(self) {