eframe: add set_minimized and set_maximized (#2292)

* add actions for window controls

* add maximized to WindowInfo
update button text
fix clippy

* add overlap icon when maximized

* remove argument `app`

* remove WindowInfo { maximized }

* Update minimum window size

* Double-click titlebar to toggle maximized state

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

crates/eframe/src/epi.rs

@@ -718,6 +718,18 @@ impl Frame {
         self.output.close = true;
     }
 
+    /// Minimize or unminimize window. (native only)
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn set_minimized(&mut self, minimized: bool) {
+        self.output.minimized = Some(minimized);
+    }
+
+    /// Maximize or unmaximize window. (native only)
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn set_maximized(&mut self, maximized: bool) {
+        self.output.maximized = Some(maximized);
+    }
+
     /// Tell `eframe` to close the desktop window.
     #[cfg(not(target_arch = "wasm32"))]
     #[deprecated = "Renamed `close`"]
@@ -1011,5 +1023,13 @@ pub(crate) mod backend {
         /// Set to some bool to tell the window always on top.
         #[cfg(not(target_arch = "wasm32"))]
         pub always_on_top: Option<bool>,
+
+        /// Set to some bool to minimize or unminimize window.
+        #[cfg(not(target_arch = "wasm32"))]
+        pub minimized: Option<bool>,
+
+        /// Set to some bool to maximize or unmaximize window.
+        #[cfg(not(target_arch = "wasm32"))]
+        pub maximized: Option<bool>,
     }
 }

crates/eframe/src/native/epi_integration.rs

@@ -207,6 +207,8 @@ pub fn handle_app_output(
         window_pos,
         visible: _, // handled in post_present
         always_on_top,
+        minimized,
+        maximized,
     } = app_output;
 
     if let Some(decorated) = decorated {
@@ -250,6 +252,14 @@ pub fn handle_app_output(
             WindowLevel::Normal
         });
     }
+
+    if let Some(minimized) = minimized {
+        window.set_minimized(minimized);
+    }
+
+    if let Some(maximized) = maximized {
+        window.set_maximized(maximized);
+    }
 }
 
 // ----------------------------------------------------------------------------