Allow applications to control the window title

`iced_winit` will change the window title dynamically at runtime!

5 files changed, 64 insertions, 18 deletions

diff --git a/examples/scroll.rs b/examples/scroll.rs
index 608923fe..5a725f0c 100644
--- a/examples/scroll.rs
+++ b/examples/scroll.rs
@@ -25,6 +25,10 @@ pub enum Message {
 impl Application for Example {
     type Message = Message;
 
+    fn title(&self) -> String {
+        String::from("Scroll - Iced")
+    }
+
     fn update(&mut self, message: Message) {
         match message {
             Message::AddItem => {
diff --git a/examples/todos.rs b/examples/todos.rs
index 2ebbcc7c..5257fc12 100644
--- a/examples/todos.rs
+++ b/examples/todos.rs
@@ -25,6 +25,10 @@ pub enum Message {
 impl Application for Todos {
     type Message = Message;
 
+    fn title(&self) -> String {
+        String::from("Todos - Iced")
+    }
+
     fn update(&mut self, message: Message) {
         match message {
             Message::InputChanged(value) => {
diff --git a/examples/tour.rs b/examples/tour.rs
index c5daa2c5..ac654a5e 100644
--- a/examples/tour.rs
+++ b/examples/tour.rs
@@ -7,9 +7,7 @@ use iced::{
 pub fn main() {
     env_logger::init();
 
-    let tour = Tour::new();
-
-    tour.run();
+    Tour::new().run()
 }
 
 pub struct Tour {
@@ -35,6 +33,10 @@ impl Tour {
 impl Application for Tour {
     type Message = Message;
 
+    fn title(&self) -> String {
+        format!("{} - Iced", self.steps.title())
+    }
+
     fn update(&mut self, event: Message) {
         match event {
             Message::BackPressed => {
@@ -52,6 +54,7 @@ impl Application for Tour {
     fn view(&mut self) -> Element<Message> {
         let Tour {
             steps,
+            scroll,
             back_button,
             next_button,
             ..
@@ -93,7 +96,7 @@ impl Application for Tour {
             .height(Length::Fill)
             .justify_content(Justify::Center)
             .push(
-                Scrollable::new(&mut self.scroll)
+                Scrollable::new(scroll)
                     .align_items(Align::Center)
                     .push(element),
             )
@@ -178,6 +181,10 @@ impl Steps {
         self.current + 1 < self.steps.len()
             && self.steps[self.current].can_continue()
     }
+
+    fn title(&self) -> &str {
+        self.steps[self.current].title()
+    }
 }
 
 enum Step {
@@ -277,6 +284,21 @@ impl<'a> Step {
         };
     }
 
+    fn title(&self) -> &str {
+        match self {
+            Step::Welcome => "Welcome",
+            Step::Radio { .. } => "Radio button",
+            Step::Slider { .. } => "Slider",
+            Step::Text { .. } => "Text",
+            Step::Image { .. } => "Image",
+            Step::RowsAndColumns { .. } => "Rows and columns",
+            Step::Scrollable => "Scrollable",
+            Step::TextInput { .. } => "Text input",
+            Step::Debugger => "Debugger",
+            Step::End => "End",
+        }
+    }
+
     fn can_continue(&self) -> bool {
         match self {
             Step::Welcome => true,
@@ -294,30 +316,27 @@ impl<'a> Step {
 
     fn view(&mut self, debug: bool) -> Element<StepMessage> {
         match self {
-            Step::Welcome => Self::welcome().into(),
-            Step::Radio { selection } => Self::radio(*selection).into(),
-            Step::Slider { state, value } => Self::slider(state, *value).into(),
+            Step::Welcome => Self::welcome(),
+            Step::Radio { selection } => Self::radio(*selection),
+            Step::Slider { state, value } => Self::slider(state, *value),
             Step::Text {
                 size_slider,
                 size,
                 color_sliders,
                 color,
-            } => Self::text(size_slider, *size, color_sliders, *color).into(),
-            Step::Image { width, slider } => Self::image(*width, slider).into(),
+            } => Self::text(size_slider, *size, color_sliders, *color),
+            Step::Image { width, slider } => Self::image(*width, slider),
             Step::RowsAndColumns {
                 layout,
                 spacing_slider,
                 spacing,
-            } => {
-                Self::rows_and_columns(*layout, spacing_slider, *spacing).into()
-            }
-            Step::Scrollable => Self::scrollable().into(),
-            Step::TextInput { value, state } => {
-                Self::text_input(value, state).into()
-            }
-            Step::Debugger => Self::debugger(debug).into(),
-            Step::End => Self::end().into(),
+            } => Self::rows_and_columns(*layout, spacing_slider, *spacing),
+            Step::Scrollable => Self::scrollable(),
+            Step::TextInput { value, state } => Self::text_input(value, state),
+            Step::Debugger => Self::debugger(debug),
+            Step::End => Self::end(),
         }
+        .into()
     }
 
     fn container(title: &str) -> Column<'a, StepMessage> {
diff --git a/src/lib.rs b/src/lib.rs
index da108804..52b0ff8c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,8 @@ pub use platform::*;
 pub trait Application {
     type Message: std::fmt::Debug;
 
+    fn title(&self) -> String;
+
     fn update(&mut self, message: Self::Message);
 
     fn view(&mut self) -> Element<Self::Message>;
@@ -33,6 +35,10 @@ where
     type Renderer = Renderer;
     type Message = A::Message;
 
+    fn title(&self) -> String {
+        self.0.title()
+    }
+
     fn update(&mut self, message: Self::Message) {
         self.0.update(message);
     }
diff --git a/winit/src/application.rs b/winit/src/application.rs
index 3b908189..4deffecc 100644
--- a/winit/src/application.rs
+++ b/winit/src/application.rs
@@ -10,6 +10,8 @@ pub trait Application {
 
     type Message: std::fmt::Debug;
 
+    fn title(&self) -> String;
+
     fn update(&mut self, message: Self::Message);
 
     fn view(&mut self) -> Element<Self::Message, Self::Renderer>;
@@ -25,12 +27,14 @@ pub trait Application {
         };
 
         let mut debug = Debug::new();
+        let mut title = self.title();
 
         debug.startup_started();
         let event_loop = EventLoop::new();
 
         // TODO: Ask for window settings and configure this properly
         let window = WindowBuilder::new()
+            .with_title(&title)
             .with_inner_size(winit::dpi::LogicalSize {
                 width: 1280.0,
                 height: 1024.0,
@@ -112,6 +116,15 @@ pub trait Application {
                         debug.update_finished();
                     }
 
+                    // Update window title
+                    let new_title = self.title();
+
+                    if title != new_title {
+                        window.set_title(&new_title);
+
+                        title = new_title;
+                    }
+
                     debug.layout_started();
                     let user_interface = UserInterface::build(
                         document(&mut self, size, &mut debug),