Handle window paint order (click to bring to front etc)

emigui/src/context.rs

@@ -55,6 +55,15 @@ impl Context {
         }
     }
 
+    pub fn drain_paint_lists(&self) -> Vec<PaintCmd> {
+        let memory = self.memory.lock().unwrap();
+        self.graphics
+            .lock()
+            .unwrap()
+            .drain(&memory.window_order)
+            .collect()
+    }
+
     /// Is the user interacting with anything?
     pub fn any_active(&self) -> bool {
         self.memory.lock().unwrap().active_id.is_some()

emigui/src/layers.rs

@@ -7,6 +7,7 @@ use crate::{Id, PaintCmd};
 pub enum Layer {
     Background,
     Window(Id),
+    /// Tooltips etc
     Popup,
 }
 
@@ -29,13 +30,14 @@ impl GraphicLayers {
         }
     }
 
-    pub fn drain(&mut self) -> impl ExactSizeIterator<Item = PaintCmd> {
+    pub fn drain(&mut self, window_oreder: &[Id]) -> impl ExactSizeIterator<Item = PaintCmd> {
         let mut all_commands: Vec<_> = self.bg.drain(..).collect();
 
-        // TODO: order
-        for window in self.windows.values_mut() {
+        for id in window_oreder {
+            if let Some(window) = self.windows.get_mut(id) {
                 all_commands.extend(window.drain(..));
             }
+        }
 
         all_commands.extend(self.popup.drain(..));
         all_commands.into_iter()

emigui/src/layout.rs

@@ -105,7 +105,7 @@ where
 
     let mut contents_region = Region {
         ctx: ctx.clone(),
-        layer: Layer::Popup,
+        layer,
         style,
         id: Default::default(),
         dir: Direction::Vertical,

emigui/src/memory.rs

@@ -13,7 +13,7 @@ pub struct Memory {
     windows: HashMap<Id, WindowState>,
 
     /// Top is last
-    window_order: Vec<Id>,
+    pub window_order: Vec<Id>,
 }
 
 impl Memory {
@@ -44,7 +44,13 @@ impl Memory {
         Layer::Background
     }
 
-    pub fn move_window_to_top(&mut self, _id: Id) {
-        // TODO
+    pub fn move_window_to_top(&mut self, id: Id) {
+        if self.window_order.last() == Some(&id) {
+            return; // common case early-out
+        }
+        if let Some(index) = self.window_order.iter().position(|x| *x == id) {
+            self.window_order.remove(index);
+        }
+        self.window_order.push(id);
     }
 }

emigui/src/window.rs

@@ -46,7 +46,7 @@ impl Window {
 
         let mut contents_region = Region {
             ctx: ctx.clone(),
-            layer: Layer::Popup,
+            layer,
             style,
             id: Default::default(),
             dir: Direction::Vertical,

example_glium/src/main.rs

@@ -91,10 +91,14 @@ fn main() {
         example_app.ui(&mut region);
         emigui.ui(&mut region);
 
-        // TODO: Make it simpler to show a window
+        // TODO: Make it even simpler to show a window
         Window::new("Test window").show(region.ctx(), |region| {
             region.add(label!("Grab the window and move it around!"));
         });
+        Window::new("Another test window").show(region.ctx(), |region| {
+            region.add(label!("This might be on top of the other window?"));
+            region.add(label!("Second line of text"));
+        });
 
         let mesh = emigui.paint();
         painter.paint(&display, mesh, emigui.texture());