feat: add durid

__gui/druid/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "druid"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+druid = "0.7.0"
+

__gui/druid/src/main.rs

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+use druid::widget::{Button, Flex, Label};
+use druid::{AppLauncher, LocalizedString, PlatformError, Widget, WidgetExt, WindowDesc, Data, Point};
+
+#[derive(Clone, Data)]
+struct Counter(i32);
+
+fn main() -> Result<(), PlatformError> {
+    // let menu = MenuDesc::new(LocalizedString::new("test"));
+
+    // Window builder. We set title and size
+    let main_window = WindowDesc::new(ui_builder)
+        .title("Hello, Druid!")
+        .window_size((600.0, 400.0))
+        // .menu(menu)
+        .set_position(Point::new(300.0, 200.0));
+
+    // Data to be used in the app (=state)
+    let data: Counter = Counter(0);
+
+    // Run the app
+    AppLauncher::with_window(main_window)
+        .use_simple_logger() // Neat!
+        .launch(data)
+}
+
+fn ui_builder() -> impl Widget<Counter> {
+    // The label text will be computed dynamically based on the current locale and count
+    let text = LocalizedString::new("hello-counter")
+        .with_arg("count", |data: &Counter, _env| (*data).0.into());
+    let label = Label::new(text).padding(5.0).center();
+
+    // Two buttons with on_click callback
+    let button_plus = Button::new("+1")
+        .fix_size(80.0, 30.0)
+        .on_click(|_ctx, data: &mut Counter, _env| (*data).0 += 1)
+        .padding(5.0);
+    let button_minus = Button::new("-1")
+        .fix_size(80.0, 30.0)
+        .on_click(|_ctx, data: &mut Counter, _env| (*data).0 -= 1)
+        .padding(5.0);
+
+    // Container for the two buttons
+    let flex = Flex::row()
+        .with_child(button_plus)
+        .with_spacer(1.0)
+        .with_child(button_minus);
+
+    // Container for the whole UI
+    Flex::column()
+        .with_child(label)
+        .with_child(flex)
+}