advotracker: reorganize the project using a crate based structure

* advotracker: the framework project
* crate/advotrackerdb: implementation of the database backend
* crate/advotrackerd: implementation of the backend (daemon)
* crate/adovtracker: implementaton of the application (CLI and GUI)

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

crates/advotracker_client/examples/pager_test.rs

@@ -0,0 +1,112 @@
+/*
+ * advotracker - Hotline tackingtool for Advocats
+ *
+ * Copyright 2021 Ralf Zerres <ralf.zerres@networkx.de>
+ * SPDX-License-Identifier: (0BSD or MIT)
+ */
+
+use orbtk::prelude::*;
+
+fn main() {
+    // use this only if you want to run it as web application.
+    orbtk::initialize();
+
+    Application::new()
+        .window(|ctx| {
+            Window::new()
+                .title("OrbTk - Pager test")
+                .position((100, 100))
+                .size(800, 600)
+                .resizeable(true)
+                .child(PagerTestView::new().build(ctx))
+                .build(ctx)
+        })
+        .run();
+}
+
+// Views
+
+widget!(
+    PagerTestView<PagerTestState> {}
+);
+
+impl Template for PagerTestView {
+    fn template(self, id: Entity, ctx: &mut BuildContext<'_>) -> Self {
+        let pager = Pager::new()
+            .attach(Grid::row(1))
+            .child(TextBlock::new().text("Page 1").build(ctx))
+            .child(TextBlock::new().text("Page 2").build(ctx))
+            .child(TextBlock::new().text("Page 3").build(ctx))
+            .build(ctx);
+
+        let next_button = Button::new()
+            .style("button_single_content")
+            .icon(material_icons_font::MD_KEYBOARD_ARROW_RIGHT)
+            .h_align("end")
+            .attach(Grid::row(2))
+            .enabled(("next_enabled", pager))
+            .text("next")
+            .on_click(move |states, _| {
+                states.send_message(PagerAction::Next, pager);
+                true
+            })
+            .build(ctx);
+
+        let previous_button = Button::new()
+            .style("button_single_content")
+            .icon(material_icons_font::MD_KEYBOARD_ARROW_LEFT)
+            .h_align("start")
+            .attach(Grid::row(2))
+            .enabled(("previous_enabled", pager))
+            .text("previous")
+            .on_click(move |states, _| {
+                states.send_message(PagerAction::Previous, pager);
+                true
+            })
+            .build(ctx);
+
+        self.child(
+            Grid::new()
+                .margin(16)
+                .rows("32, *, 32")
+                .child(TextBlock::new().text("Pager Widget").build(ctx))
+                .child(pager)
+                .child(previous_button)
+                .child(next_button)
+                .build(ctx),
+        )
+    }
+}
+
+// States
+static ID_PAGER_TEST: &str = "id_pager_test";
+
+#[derive(Debug, Clone, Copy)]
+pub enum PagerTestAction {}
+
+/// Valid `structures` that are handled inside the state of the `PagerTest` widget.
+#[derive(AsAny, Debug, Default)]
+pub struct PagerTestState {
+    pager_test: Entity,
+}
+
+/// Method definitions, that react on any given state change inside the `Menu` widget.
+impl PagerTestState {
+    fn init(&mut self, _registry: &mut Registry, ctx: &mut Context) {
+        self.pager_test = ctx.child(ID_PAGER_TEST).entity();
+    }
+}
+
+impl State for PagerTestState {
+    /// Handle messages for the `PagerTestState`
+    fn messages(
+        &mut self,
+        mut messages: MessageReader,
+        _registry: &mut Registry,
+        ctx: &mut Context<'_>,
+    ) {
+        for message in messages.read::<PagerTestAction>() {
+            ctx.send_message(message, self.pager_test);
+        }
+    }
+}