frontend: the advoware GUI

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

frontend/examples/overlay.rs

@@ -0,0 +1,52 @@
+use orbtk::prelude::*;
+
+widget!(MainView);
+
+impl Template for MainView {
+    fn template(self, _: Entity, ctx: &mut BuildContext) -> Self {
+        let container = Container::create()
+            .background("#dfebf5")
+            .width(200.0)
+            .height(200.0)
+            .child(
+                TextBlock::create()
+                    .foreground("#3b434a")
+                    .text("Overlay")
+                    .vertical_alignment("center")
+                    .horizontal_alignment("center")
+                    .build(ctx),
+            )
+            .build(ctx);
+
+        ctx.append_child_to_overlay(container).unwrap();
+        self.name("MainView").child(
+            Container::create()
+                .background("#e1bc21")
+                .child(
+                    TextBlock::create()
+                        .text("MainView")
+                        .element("h1")
+                        .vertical_alignment("center")
+                        .horizontal_alignment("center")
+                        .build(ctx),
+                )
+                .build(ctx),
+        )
+    }
+}
+
+fn main() {
+    // use this only if you want to run it as web application.
+    orbtk::initialize();
+
+    Application::new()
+        .window(|ctx| {
+            Window::create()
+                .title("OrbTk - overlay example")
+                .position((100.0, 100.0))
+                .size(420.0, 730.0)
+                .child(MainView::create().build(ctx))
+                .build(ctx)
+        })
+        .run();
+}