frontend: main: the advotracker frontend entry function

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

frontend/src/main.rs

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+use orbtk::prelude::*;
+use orbtk::theme::DEFAULT_THEME_CSS;
+//use orbtk::theme::LIGHT_THEME_EXTENSION_CSS;
+
+pub mod base_state;
+pub mod data;
+pub mod keys;
+pub mod main_view;
+
+// validation check of a policy data element given by its poliy code
+pub mod policycheck_view;
+pub mod policycheck_state;
+
+// manage list of policy data structures
+pub mod policylist_view;
+pub mod policylist_state;
+
+//#[cfg(feature = "light-theme")]
+static WIDGET_EXT: &'static str = include_str!("../resources/stylesheets/policyholder_check.css");
+
+fn get_theme() -> ThemeValue {
+    //ThemeValue::create_from_css(LIGHT_THEME_EXTENSION_CSS)
+    ThemeValue::create_from_css(DEFAULT_THEME_CSS)
+	.extension_css(WIDGET_EXT)
+	.build()
+}
+
+fn main() {
+    Application::from_name("rzerres.advotracker")
+	.window(move |ctx| {
+	    Window::new()
+		//.title("OrbTk - Policyholder checker example")
+		.title("AdvoTracker - Versicherungsnummern")
+		.position((-500.0, -100.0))
+		.size(480.0, 260.0)
+		.min_width(460.0)
+		.min_height(180.0)
+		.resizeable(true)
+		.theme(get_theme())
+		.child(main_view::MainView::new().build(ctx))
+		.build(ctx)
+	})
+	.run();
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+	assert_eq!(2 + 2, 4);
+    }
+}