added epi::Frame::set_window_pos (#1505)

this allows setting the position of window at runtime

egui-winit/src/epi.rs

@@ -96,6 +96,7 @@ pub fn handle_app_output(
         window_title,
         decorated,
         drag_window,
+        window_pos,
     } = app_output;
 
     if let Some(decorated) = decorated {
@@ -116,6 +117,13 @@ pub fn handle_app_output(
         window.set_title(&window_title);
     }
 
+    if let Some(window_pos) = window_pos {
+        window.set_outer_position(winit::dpi::PhysicalPosition {
+            x: window_pos.x as f64,
+            y: window_pos.y as f64,
+        });
+    }
+
     if drag_window {
         let _ = window.drag_window();
     }

egui_web/src/backend.rs

@@ -268,6 +268,7 @@ impl AppRunner {
                 window_title: _, // TODO: change title of window
                 decorated: _,    // Can't toggle decorations
                 drag_window: _,  // Can't be dragged
+                window_pos: _,   // Can't set position of a web page
             } = app_output;
         }
 

epi/src/lib.rs

@@ -323,6 +323,11 @@ impl Frame {
         self.output.decorated = Some(decorated);
     }
 
+    /// set the position of the outer window
+    pub fn set_window_pos(&mut self, pos: egui::Pos2) {
+        self.output.window_pos = Some(pos);
+    }
+
     /// When called, the native window will follow the
     /// movement of the cursor while the primary mouse button is down.
     ///
@@ -503,5 +508,8 @@ pub mod backend {
 
         /// Set to true to drag window while primary mouse button is down.
         pub drag_window: bool,
+
+        /// Set to some position to move the outer window (e.g. glium window) to this position
+        pub window_pos: Option<egui::Pos2>,
     }
 }