window task for setting resize increments

runtime/src/window.rs

@@ -167,6 +167,9 @@ pub enum Action {
 
     /// Set the window to be resizable or not.
     SetResizable(Id, bool),
+
+    /// Set the window size increment.
+    SetResizeIncrements(Id, Option<Size>),
 }
 
 /// Subscribes to the frames of the window of the running application.
@@ -400,6 +403,15 @@ pub fn set_min_size<T>(id: Id, size: Option<Size>) -> Task<T> {
     task::effect(crate::Action::Window(Action::SetMinSize(id, size)))
 }
 
+/// Set the window size increment.
+///
+/// This is usually used by apps such as terminal emulators that need "blocky" resizing.
+pub fn set_resize_increments<T>(id: Id, increments: Option<Size>) -> Task<T> {
+    task::effect(crate::Action::Window(Action::SetResizeIncrements(
+        id, increments,
+    )))
+}
+
 /// Show the [system menu] at cursor position.
 ///
 /// [system menu]: https://en.wikipedia.org/wiki/Common_menus_in_Microsoft_Windows#System_menu

winit/src/program.rs

@@ -1311,6 +1311,16 @@ fn run_action<P, C>(
                     }));
                 }
             }
+            window::Action::SetResizeIncrements(id, increments) => {
+                if let Some(window) = window_manager.get_mut(id) {
+                    window.raw.set_resize_increments(increments.map(|x| {
+                        winit::dpi::LogicalSize {
+                            width: x.width,
+                            height: x.height,
+                        }
+                    }));
+                }
+            }
             window::Action::ChangeTitle(id, title) => {
                 if let Some(window) = window_manager.get_mut(id) {
                     window.raw.set_title(&title);