track focus and draw borders

1 files changed, 57 insertions, 9 deletions

diff --git a/src/focus.rs b/src/focus.rs
index ea4f021..a237e24 100644
--- a/src/focus.rs
+++ b/src/focus.rs
@@ -1,20 +1,68 @@
-use xcb::x::{EnterNotifyEvent, FocusInEvent, MotionNotifyEvent};
+use xcb::x::{
+    self, ChangeWindowAttributes, Cw, EnterNotifyEvent, FocusInEvent, InputFocus, NotifyDetail,
+    NotifyMode, SetInputFocus, Window,
+};
 
-use crate::{error::*, WM};
+use crate::{clients::Client, error::*, WM};
 
 impl WM<'_> {
-    pub(crate) fn handle_enter_notify(&self, _e: EnterNotifyEvent) -> Result<()> {
-        // todo!()
+    pub(crate) fn handle_enter_notify(&mut self, e: EnterNotifyEvent) -> Result<()> {
+        if (e.mode() != NotifyMode::Normal || e.detail() == NotifyDetail::Inferior)
+            && e.event() != self.root
+        {
+            return Ok(());
+        }
+
+        self.focus_window(e.event());
+        self.conn.flush()?;
+
         Ok(())
     }
 
-    pub(crate) fn handle_focus_in(&self, _e: FocusInEvent) -> Result<()> {
-        // todo!()
+    pub(crate) fn handle_focus_in(&mut self, e: FocusInEvent) -> Result<()> {
+        if self
+            .clients
+            .focused_mut()
+            .map(|c| c.window() != e.event())
+            .unwrap_or(true)
+        {
+            self.focus_window(e.event());
+        }
         Ok(())
     }
 
-    pub(crate) fn handle_motion_notify(&self, _e: MotionNotifyEvent) -> Result<()> {
-        // todo!()
-        Ok(())
+    /// Attempt to focus the given window, falling back to the root if the window isn't our client.
+    /// This function sends multiple requests without checking them, so conn.flush() should be called after.
+    pub fn focus_window(&mut self, window: Window) {
+        if let Some((mon, i)) = self.clients.find_client_pos(window) {
+            self.refocus(mon, i);
+        } else {
+            self.conn.send_request(&SetInputFocus {
+                revert_to: InputFocus::PointerRoot,
+                focus: window,
+                time: x::CURRENT_TIME,
+            });
+            // TODO: XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
+        }
+    }
+
+    /// Refocus on the client with the given co-ordinates, setting the X11 properties as required.
+    /// This function sends multiple requests without checking them, so conn.flush() should be called after.
+    pub fn refocus(&mut self, mon: usize, i: usize) {
+        self.unfocus();
+        if let Some(new) = self.clients.set_focused(mon, i) {
+            new.set_border(self.conn, self.colours.border_focused());
+            // TODO: reset urgent flag
+            // TODO: something to do with grabbuttons
+            // TODO: set input focus
+            // TODO: set active window
+            // TODO: send wmtakefocus event
+        }
+    }
+
+    pub fn unfocus(&mut self) {
+        if let Some(old) = self.clients.focused_mut() {
+            old.set_border(self.conn, self.colours.border_normal());
+        }
     }
 }