Disable cursor when window not in focus

src/cursor.rs

@@ -30,11 +30,13 @@ impl Alpha {
     }
 }
 
+#[derive(PartialEq)]
 enum AnimPhase {
     Shown,
     Hide,
     Hidden,
     Show,
+    NoFocus,
 }
 
 struct State {
@@ -53,9 +55,13 @@ impl State {
         }
     }
 
-    fn reset(&mut self) {
+    fn reset_to(&mut self, phase: AnimPhase) {
         self.alpha = Alpha(1.0);
-        self.anim_phase = AnimPhase::Shown;
+        self.anim_phase = phase;
+        if let Some(timer_id) = self.timer {
+            glib::source_remove(timer_id);
+            self.timer = None;
+        }
     }
 }
 
@@ -71,10 +77,7 @@ impl Cursor {
     pub fn start(&mut self) {
         let state = self.state.clone();
         let mut mut_state = self.state.borrow_mut();
-        mut_state.reset();
+        mut_state.reset_to(AnimPhase::Shown);
-        if let Some(timer_id) = mut_state.timer {
-            glib::source_remove(timer_id);
-        }
         mut_state.timer = Some(glib::timeout_add(500, move || anim_step(&state)));
     }
 
@@ -82,6 +85,14 @@ impl Cursor {
         self.start();
     }
     
+    pub fn enter_focus(&mut self) {
+        self.start();
+    }
+
+    pub fn leave_focus(&mut self) {
+        self.state.borrow_mut().reset_to(AnimPhase::NoFocus);
+    }
+
     pub fn draw(&self,
                 ctx: &cairo::Context,
                 shell: &Shell,
@@ -106,7 +117,11 @@ impl Cursor {
         };
 
         ctx.rectangle(current_point.0, line_y, cursor_width, line_height);
-        ctx.fill();
+        if state.anim_phase == AnimPhase::NoFocus {
+            ctx.stroke();
+        } else {
+            ctx.fill();
+        }
     }
 }
 
@@ -142,6 +157,7 @@ fn anim_step(state: &Arc<UiMutex<State>>) -> glib::Continue {
                 None
             }
         }
+        AnimPhase::NoFocus => None, 
     };
 
     SHELL!(&shell = {

src/shell.rs

@@ -5,7 +5,7 @@ use pangocairo as pc;
 use pango;
 use pango::FontDescription;
 use gdk::{ModifierType, EventKey, EventConfigure, EventButton, EventMotion, EventType, EventScroll,
-          ScrollDirection};
+          ScrollDirection, EventFocus};
 use gdk_sys;
 use glib;
 use gtk::prelude::*;
@@ -88,6 +88,8 @@ impl Shell {
         self.drawing_area.connect_draw(gtk_draw);
         self.drawing_area.connect_key_press_event(gtk_key_press);
         self.drawing_area.connect_scroll_event(gtk_scroll_event);
+        self.drawing_area.connect_focus_in_event(gtk_focus_in);
+        self.drawing_area.connect_focus_out_event(gtk_focus_out);
     }
 
     pub fn add_configure_event(&mut self) {
@@ -138,6 +140,24 @@ impl Shell {
     }
 }
 
+fn gtk_focus_in(_: &DrawingArea, _: &EventFocus) -> Inhibit {
+    SHELL!(shell = {
+        shell.cursor.enter_focus();
+        let point = shell.model.cur_point();
+        shell.on_redraw(&RepaintMode::Area(point));
+    });
+    Inhibit(false)
+}
+
+fn gtk_focus_out(_: &DrawingArea, _: &EventFocus) -> Inhibit {
+    SHELL!(shell = {
+        shell.cursor.leave_focus();
+        let point = shell.model.cur_point();
+        shell.on_redraw(&RepaintMode::Area(point));
+    });
+    Inhibit(false)
+}
+
 fn gtk_scroll_event(_: &DrawingArea, ev: &EventScroll) -> Inhibit {
     SHELL!(shell = {
         if !shell.mouse_enabled {