Merge pull request #1927 from thunderstorm010/master

Add command to retrieve window size

runtime/src/window.rs

@@ -9,6 +9,7 @@ pub use screenshot::Screenshot;
 use crate::command::{self, Command};
 use crate::core::time::Instant;
 use crate::core::window::{Event, Icon, Level, Mode, UserAttention};
+use crate::core::Size;
 use crate::futures::subscription::{self, Subscription};
 
 /// Subscribes to the frames of the window of the running application.
@@ -37,8 +38,15 @@ pub fn drag<Message>() -> Command<Message> {
 }
 
 /// Resizes the window to the given logical dimensions.
-pub fn resize<Message>(width: u32, height: u32) -> Command<Message> {
-    Command::single(command::Action::Window(Action::Resize { width, height }))
+pub fn resize<Message>(new_size: Size<u32>) -> Command<Message> {
+    Command::single(command::Action::Window(Action::Resize(new_size)))
+}
+
+/// Fetches the current window size in logical dimensions.
+pub fn fetch_size<Message>(
+    f: impl FnOnce(Size<u32>) -> Message + 'static,
+) -> Command<Message> {
+    Command::single(command::Action::Window(Action::FetchSize(Box::new(f))))
 }
 
 /// Maximizes the window.

runtime/src/window/action.rs

@@ -1,4 +1,5 @@
 use crate::core::window::{Icon, Level, Mode, UserAttention};
+use crate::core::Size;
 use crate::futures::MaybeSend;
 use crate::window::Screenshot;
 
@@ -15,12 +16,9 @@ pub enum Action<T> {
     /// button was pressed immediately before this function is called.
     Drag,
     /// Resize the window.
-    Resize {
-        /// The new logical width of the window
-        width: u32,
-        /// The new logical height of the window
-        height: u32,
-    },
+    Resize(Size<u32>),
+    /// Fetch the current size of the window.
+    FetchSize(Box<dyn FnOnce(Size<u32>) -> T + 'static>),
     /// Set the window to maximized or back
     Maximize(bool),
     /// Set the window to minimized or back
@@ -106,7 +104,8 @@ impl<T> Action<T> {
         match self {
             Self::Close => Action::Close,
             Self::Drag => Action::Drag,
-            Self::Resize { width, height } => Action::Resize { width, height },
+            Self::Resize(size) => Action::Resize(size),
+            Self::FetchSize(o) => Action::FetchSize(Box::new(move |s| f(o(s)))),
             Self::Maximize(maximized) => Action::Maximize(maximized),
             Self::Minimize(minimized) => Action::Minimize(minimized),
             Self::Move { x, y } => Action::Move { x, y },
@@ -135,10 +134,8 @@ impl<T> fmt::Debug for Action<T> {
         match self {
             Self::Close => write!(f, "Action::Close"),
             Self::Drag => write!(f, "Action::Drag"),
-            Self::Resize { width, height } => write!(
-                f,
-                "Action::Resize {{ widget: {width}, height: {height} }}"
-            ),
+            Self::Resize(size) => write!(f, "Action::Resize({size:?})"),
+            Self::FetchSize(_) => write!(f, "Action::FetchSize"),
             Self::Maximize(maximized) => {
                 write!(f, "Action::Maximize({maximized})")
             }

winit/src/application.rs

@@ -748,12 +748,22 @@ pub fn run_command<A, C, E>(
                 window::Action::Drag => {
                     let _res = window.drag_window();
                 }
-                window::Action::Resize { width, height } => {
+                window::Action::Resize(size) => {
                     window.set_inner_size(winit::dpi::LogicalSize {
-                        width,
-                        height,
+                        width: size.width,
+                        height: size.height,
                     });
                 }
+                window::Action::FetchSize(callback) => {
+                    let size = window.inner_size();
+
+                    proxy
+                        .send_event(callback(Size::new(
+                            size.width,
+                            size.height,
+                        )))
+                        .expect("Send message to event loop")
+                }
                 window::Action::Maximize(maximized) => {
                     window.set_maximized(maximized);
                 }