chore: initial commit

src/popup.rs

@@ -0,0 +1,87 @@
+use gtk::prelude::*;
+use gtk::{Application, ApplicationWindow, Orientation};
+
+#[derive(Debug, Clone)]
+pub struct Popup {
+    pub window: ApplicationWindow,
+    pub container: gtk::Box,
+}
+
+pub enum PopupAlignment {
+    Left,
+    Center,
+    Right,
+}
+
+impl Popup {
+    pub fn new(name: &str, app: &Application, orientation: Orientation) -> Self {
+        let win = ApplicationWindow::builder().application(app).build();
+
+        gtk_layer_shell::init_for_window(&win);
+        gtk_layer_shell::set_layer(&win, gtk_layer_shell::Layer::Overlay);
+
+        gtk_layer_shell::set_margin(&win, gtk_layer_shell::Edge::Top, 0);
+        gtk_layer_shell::set_margin(&win, gtk_layer_shell::Edge::Bottom, 5);
+        gtk_layer_shell::set_margin(&win, gtk_layer_shell::Edge::Left, 0);
+        gtk_layer_shell::set_margin(&win, gtk_layer_shell::Edge::Right, 0);
+
+        gtk_layer_shell::set_anchor(&win, gtk_layer_shell::Edge::Top, false);
+        gtk_layer_shell::set_anchor(&win, gtk_layer_shell::Edge::Bottom, true);
+        gtk_layer_shell::set_anchor(&win, gtk_layer_shell::Edge::Left, true);
+        gtk_layer_shell::set_anchor(&win, gtk_layer_shell::Edge::Right, false);
+
+        let content = gtk::Box::builder()
+            .orientation(orientation)
+            .spacing(0)
+            .hexpand(false)
+            .name(name)
+            .build();
+
+        content.style_context().add_class("popup");
+
+        win.add(&content);
+
+        win.connect_leave_notify_event(|win, ev| {
+            let (w, _h) = win.size();
+            let (x, y) = ev.position();
+
+            const THRESHOLD: f64 = 3.0;
+
+            // some child widgets trigger this event
+            // so check we're actually outside the window
+            if x < THRESHOLD || y < THRESHOLD || x > f64::from(w) - THRESHOLD {
+                win.hide();
+            }
+
+            Inhibit(false)
+        });
+
+        Self {
+            window: win,
+            container: content,
+        }
+    }
+
+    /// Sets the popover's X position relative to the left border of the screen
+    pub fn set_pos(&self, pos: f64, alignment: PopupAlignment) {
+        let width = self.window.allocated_width();
+
+        let offset = match alignment {
+            PopupAlignment::Left => pos,
+            PopupAlignment::Center => (pos - (f64::from(width) / 2.0)).round(),
+            PopupAlignment::Right => pos - f64::from(width),
+        };
+
+        gtk_layer_shell::set_margin(&self.window, gtk_layer_shell::Edge::Left, offset as i32);
+    }
+
+    /// Shows the popover
+    pub fn show(&self) {
+        self.window.show_all();
+    }
+
+    /// Hides the popover
+    pub fn hide(&self) {
+        self.window.hide();
+    }
+}