Implement dragging and resizing of borderless window

CHANGELOG.md

@@ -10,6 +10,10 @@ Notable changes to the `alacritty_terminal` crate are documented in its
 
 ## 0.14.0-dev
 
+### Added
+
+- Moving and resizing of windows without decorations by dragging the padding at the top or bottom-right
+
 ### Changed
 
 - Pressing `Alt` with unicode input will now add `ESC` like for ASCII input

alacritty/src/display/window.rs

@@ -16,6 +16,7 @@ use {
     png::Decoder,
 };
 
+use log::debug;
 use std::fmt::{self, Display, Formatter};
 
 #[cfg(target_os = "macos")]
@@ -363,6 +364,20 @@ impl Window {
         self.window.set_resize_increments(Some(increments));
     }
 
+    pub fn drag_window(&self) {
+        match self.window.drag_window() {
+            Err(err) => debug!("Unable to initiate dragging the window: {}", err),
+            Ok(_) => (),
+        }
+    }
+
+    pub fn drag_resize_window(&self) {
+        match self.window.drag_resize_window(winit::window::ResizeDirection::SouthEast) {
+            Err(err) => debug!("Unable to initiate resizing the window: {}", err),
+            Ok(_) => (),
+        }
+    }
+
     /// Toggle the window's fullscreen state.
     pub fn toggle_fullscreen(&self) {
         self.set_fullscreen(self.window.fullscreen().is_none());

alacritty/src/input/mod.rs

@@ -36,7 +36,6 @@ use alacritty_terminal::vi_mode::ViMotion;
 use alacritty_terminal::vte::ansi::{ClearMode, Handler};
 
 use crate::clipboard::Clipboard;
-#[cfg(target_os = "macos")]
 use crate::config::window::Decorations;
 use crate::config::{Action, BindingMode, MouseAction, SearchAction, UiConfig, ViAction};
 use crate::display::hint::HintMatch;
@@ -450,6 +449,21 @@ impl<T: EventListener, A: ActionContext<T>> Processor<T, A> {
         let inside_text_area = size_info.contains_point(x, y);
         let cell_side = self.cell_side(x);
 
+        if !inside_text_area && self.ctx.config().window.decorations == Decorations::None {
+            // North padding of borderless window allows to move the window.
+            if y < size_info.padding_y() as usize {
+                self.ctx.window().set_mouse_cursor(CursorIcon::Move);
+                return;
+            }
+            // South-east corner of padding of borderless window allows to resize the window.
+            else if y > size_info.height() as usize - size_info.padding_y() as usize
+                && x > size_info.width() as usize - size_info.padding_x() as usize
+            {
+                self.ctx.window().set_mouse_cursor(CursorIcon::SeResize);
+                return;
+            }
+        }
+
         let point = self.ctx.mouse().point(&size_info, display_offset);
         let cell_changed = old_point != point;
 
@@ -625,7 +639,24 @@ impl<T: EventListener, A: ActionContext<T>> Processor<T, A> {
 
             // Load mouse point, treating message bar and padding as the closest cell.
             let display_offset = self.ctx.terminal().grid().display_offset();
-            let point = self.ctx.mouse().point(&self.ctx.size_info(), display_offset);
+            let size_info = self.ctx.size_info();
+            let point = self.ctx.mouse().point(&size_info, display_offset);
+
+            if self.ctx.config().window.decorations == Decorations::None {
+                // When clicking the north padding, drag window.
+                if self.ctx.mouse().y < size_info.padding_y() as usize {
+                    self.ctx.window().drag_window();
+                    return;
+                }
+                // When clicking the south-east padding corner, resize window.
+                if self.ctx.mouse().y > size_info.height() as usize - size_info.padding_y() as usize
+                    && self.ctx.mouse().x
+                        > size_info.width() as usize - size_info.padding_x() as usize
+                {
+                    self.ctx.window().drag_resize_window();
+                    return;
+                }
+            }
 
             if let MouseButton::Left = button {
                 self.on_left_click(point)