From c50e0ef424975e73d770ad5a4cc873abf2cb6a28 Mon Sep 17 00:00:00 2001
From: tcmal <me@aria.rip>
Date: Mon, 3 Jun 2024 18:06:04 +0100
Subject: cursors & scaffolding event handling

---
 src/cursors.rs | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs    | 57 +++++++++++++++++++++++++++++++++++++++++++++++++--------
 2 files changed, 102 insertions(+), 8 deletions(-)
 create mode 100644 src/cursors.rs

diff --git a/src/cursors.rs b/src/cursors.rs
new file mode 100644
index 0000000..1e5fbd3
--- /dev/null
+++ b/src/cursors.rs
@@ -0,0 +1,53 @@
+use crate::Result;
+use xcb::{
+    x::{CreateGlyphCursor, Cursor, Font, OpenFont},
+    Connection,
+};
+
+// https://tronche.com/gui/x/xlib/appendix/b/
+const XC_LEFT_PTR: u16 = 68;
+
+#[derive(Debug)]
+pub struct Cursors {
+    font: Font,
+
+    pub normal: Cursor,
+    // TODO: ...
+}
+
+impl Cursors {
+    pub fn new_with(conn: &Connection) -> Result<Self> {
+        // Open cursor font
+        let font = conn.generate_id();
+        conn.check_request(conn.send_request_checked(&OpenFont {
+            fid: font,
+            name: "cursor".as_bytes(),
+        }))?;
+
+        Ok(Self {
+            normal: Self::load_cursor(conn, font, XC_LEFT_PTR)?,
+            font,
+        })
+    }
+
+    /// Load the cursor with the given id from `font`
+    fn load_cursor(conn: &Connection, font: Font, id: u16) -> Result<Cursor> {
+        let cid = conn.generate_id();
+        // https://github.com/mirror/libX11/blob/ff8706a5eae25b8bafce300527079f68a201d27f/src/Cursor.c#L34
+        conn.check_request(conn.send_request_checked(&CreateGlyphCursor {
+            cid,
+            source_font: font,
+            mask_font: font,
+            source_char: id,
+            mask_char: id + 1,
+            fore_red: 0,
+            fore_green: 0,
+            fore_blue: 0,
+            back_red: u16::MAX,
+            back_green: u16::MAX,
+            back_blue: u16::MAX,
+        }))?;
+
+        Ok(cid)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index ea42009..adacdfd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,13 +1,15 @@
 use atoms::InternedAtoms;
 use clients::ClientList;
+use cursors::Cursors;
 use thiserror::Error;
 use xcb::{
-    x::{self, ChangeWindowAttributes, Screen, Window},
+    x::{self, ChangeWindowAttributes, Window},
     Connection, Extension,
 };
 
 mod atoms;
 mod clients;
+mod cursors;
 
 type Result<T, E = Error> = std::result::Result<T, E>;
 
@@ -22,6 +24,9 @@ pub enum Error {
     #[error("connection error: {0}")]
     ConnectionError(#[from] xcb::ConnError),
 
+    #[error("protocol error: {0}")]
+    ProtocolError(#[from] xcb::ProtocolError),
+
     #[error("generic xcb error: {0}")]
     XCBError(#[from] xcb::Error),
 }
@@ -47,6 +52,8 @@ struct WM<'a> {
 
     root: Window,
     clients: ClientList,
+
+    cursors: Cursors,
     atoms: InternedAtoms,
 }
 
@@ -60,19 +67,18 @@ impl WM<'_> {
             .ok_or(Error::NoSuchScreen)?;
 
         // Check no other WM is running
-        let cookie = conn.send_request_checked(&ChangeWindowAttributes {
+        conn.check_request(conn.send_request_checked(&ChangeWindowAttributes {
             window: screen.root(),
             value_list: &[
                 x::Cw::BackPixel(screen.white_pixel()),
                 x::Cw::EventMask(x::EventMask::SUBSTRUCTURE_REDIRECT),
             ],
-        });
-
-        conn.check_request(cookie)
-            .map_err(|_| Error::OtherWMRunning)?;
+        }))
+        .map_err(|_| Error::OtherWMRunning)?;
 
         Ok(WM {
             atoms: InternedAtoms::new_with(conn)?,
+            cursors: Cursors::new_with(conn)?,
             clients: Default::default(),
             conn,
             screen_num,
@@ -80,11 +86,46 @@ impl WM<'_> {
         })
     }
 
-    fn event_loop(&mut self) -> Result<()> {
-        self.update_geometry()?;
+    fn setup_root(&self) -> Result<()> {
+        // TODO: set wm properties
+        self.conn
+            .check_request(self.conn.send_request_checked(&ChangeWindowAttributes {
+                window: self.root,
+                value_list: &[
+                    x::Cw::EventMask(
+                        x::EventMask::SUBSTRUCTURE_REDIRECT
+                            | x::EventMask::SUBSTRUCTURE_NOTIFY
+                            | x::EventMask::BUTTON_PRESS
+                            | x::EventMask::POINTER_MOTION
+                            | x::EventMask::ENTER_WINDOW
+                            | x::EventMask::LEAVE_WINDOW
+                            | x::EventMask::STRUCTURE_NOTIFY
+                            | x::EventMask::PROPERTY_CHANGE,
+                    ),
+                    x::Cw::Cursor(self.cursors.normal),
+                ],
+            }))?;
+
+        // TODO: grab keys
+
+        // TODO: reset focus
 
         Ok(())
     }
+
+    fn event_loop(&mut self) -> Result<()> {
+        self.update_geometry()?;
+        self.setup_root()?;
+
+        loop {
+            match self.conn.wait_for_event()? {
+                e => {
+                    dbg!(e);
+                    // TODO: actually deal with events
+                }
+            };
+        }
+    }
 }
 fn cleanup_process_children() {
     // todo: dont transform children into zombies when they terminate
-- 
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