1 files changed, 51 insertions, 0 deletions
diff --git a/src/gui/state.rs b/src/gui/state.rs
new file mode 100644
index 0000000..7b9542a
--- /dev/null
+++ b/src/gui/state.rs
@@ -0,0 +1,51 @@
+use gtk::prelude::*;
+use std::collections::HashMap;
+use std::rc::Rc;
+use std::sync::Mutex;
+
+pub trait View {
+    fn name(&self) -> &str;
+    fn set_vm(&mut self, vm : Rc<ViewManager>);
+    fn make_current(&self) -> gtk::Box;
+}
+
+#[derive(Default)]
+pub struct ViewManager {
+    views : HashMap<String, Rc<Mutex<dyn View>>>,
+    pub current : String,
+    pub window : Option<gtk::ApplicationWindow>
+}
+
+impl ViewManager {
+    pub fn new(window : gtk::ApplicationWindow) -> Self {
+        Self {
+            views : HashMap::new(),
+            current : String::new(),
+            window : Some(window),
+        }
+    }
+
+    pub fn empty() -> Self {
+        Self {
+            .. Default::default()
+        }
+    }
+
+    pub fn add_view(&mut self, view : Rc<Mutex<dyn View>>) {
+        self.views.insert(view.lock().unwrap().name().to_string(), view.clone());
+    }
+
+    pub fn set_current_view(&self, name : &str) {
+        let b = self.views.get(name).expect("unkown view").lock().unwrap().make_current();
+        let window = self.window.as_ref().unwrap();
+        for child in window.children() {
+            window.remove(&child)
+        }
+        window.add(&b);
+        window.show_all()
+    }
+
+    pub fn get_window(&self) -> &gtk::ApplicationWindow {
+        self.window.as_ref().unwrap()
+    }
+}