Added todo example

examples/todo.rs

@@ -0,0 +1,77 @@
+use gooey::kludgine::app::winit::keyboard::{Key, NamedKey};
+use gooey::value::{Dynamic, Validations};
+use gooey::widget::{Children, MakeWidget, IGNORED};
+use gooey::widgets::checkbox::Checkable;
+use gooey::widgets::checkbox::CheckboxState;
+use gooey::widgets::input::InputValue;
+use gooey::widgets::layers::OverlayLayer;
+use gooey::Run;
+
+struct State {
+    tasks: Dynamic<Vec<String>>,
+    task: Dynamic<String>,
+}
+
+fn main() -> gooey::Result {
+    let state = State {
+        tasks: Dynamic::new(vec![
+            "Buy milk".to_string(),
+            "Buy eggs".to_string(),
+            "Buy bread".to_string(),
+        ]),
+        task: Dynamic::default(),
+    };
+    let tooltips = OverlayLayer::default();
+    let validations = Validations::default();
+
+    let task_field = "Add a new task"
+        .and(
+            state
+                .task
+                .clone()
+                .into_input()
+                .on_key(|key| {
+                    if let Key::Named(NamedKey::Enter) = key.logical_key {
+                        // state.tasks.lock().push(state.task.get());
+                    }
+                    IGNORED
+                })
+                .placeholder("New task...")
+                .validation(validations.validate(&state.task, |u: &String| {
+                    if u.is_empty() {
+                        Err("Task cannot be empty")
+                    } else {
+                        Ok(())
+                    }
+                }))
+                .hint("Press enter to add task")
+                .tooltip(&tooltips, "Enter a task to add it to the list"),
+        )
+        .into_rows();
+
+    let task_list = state.tasks.map_each({
+        move |tasks| {
+            tasks
+                .iter()
+                .map(|task| {
+                    let checkbox_state = Dynamic::new(CheckboxState::Checked);
+                    let label = Dynamic::new(task.clone());
+                    checkbox_state
+                        .clone()
+                        .into_checkbox(label)
+                        .align_left()
+                        .make_widget()
+                })
+                .collect::<Children>()
+        }
+    });
+
+    let ui = task_field
+        .and(task_list.into_rows().vertical_scroll())
+        .into_rows()
+        .expand()
+        .contain()
+        .pad();
+
+    ui.and(tooltips).into_layers().run()
+}