From 0fbf9f4dc2946991e6388370403bc246c4e6db3c Mon Sep 17 00:00:00 2001
From: Ferdinand Schober <ferdinand.schober@fau.de>
Date: Sat, 16 Dec 2023 11:47:52 +0100
Subject: [PATCH] X11: Mouse emulation now fully supported

---
 src/backend/consumer/x11.rs | 48 ++++++++++++++++++++++++++++++++-----
 src/event.rs                |  2 ++
 2 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/src/backend/consumer/x11.rs b/src/backend/consumer/x11.rs
index 6e6044c..2d46a40 100644
--- a/src/backend/consumer/x11.rs
+++ b/src/backend/consumer/x11.rs
@@ -2,7 +2,7 @@ use async_trait::async_trait;
 use std::ptr;
 use x11::{xlib, xtest};
 
-use crate::{client::ClientHandle, consumer::EventConsumer, event::Event};
+use crate::{client::ClientHandle, consumer::EventConsumer, event::{Event, PointerEvent, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT, BTN_FORWARD, BTN_BACK}};
 
 pub struct X11Consumer {
     display: *mut xlib::Display,
@@ -25,7 +25,36 @@ impl X11Consumer {
     fn relative_motion(&self, dx: i32, dy: i32) {
         unsafe {
             xtest::XTestFakeRelativeMotionEvent(self.display, dx, dy, 0, 0);
-            xlib::XFlush(self.display);
+        }
+    }
+
+    fn emulate_mouse_button(&self, button: u32, state: u32) {
+        unsafe {
+            let x11_button = match button {
+                BTN_RIGHT => 3,
+                BTN_MIDDLE => 2,
+                BTN_BACK => 8,
+                BTN_FORWARD => 9,
+                BTN_LEFT | _ => 1,
+            };
+            xtest::XTestFakeButtonEvent(self.display, x11_button, state as i32, 0);
+        };
+    }
+
+    const SCROLL_UP: u32 = 4;
+    const SCROLL_DOWN: u32 = 5;
+    const SCROLL_LEFT: u32 = 6;
+    const SCROLL_RIGHT: u32 = 7;
+
+    fn emulate_scroll(&self, axis: u8, value: f64) {
+        let direction = match axis {
+            1 => if value < 0.0 { Self::SCROLL_LEFT } else { Self::SCROLL_RIGHT },
+            _ => if value < 0.0 { Self::SCROLL_UP } else { Self::SCROLL_DOWN },
+        };
+
+        unsafe {
+            xtest::XTestFakeButtonEvent(self.display, direction, 1, 0);
+            xtest::XTestFakeButtonEvent(self.display, direction, 0, 0);
         }
     }
 }
@@ -41,20 +70,27 @@ impl EventConsumer for X11Consumer {
     async fn consume(&mut self, event: Event, _: ClientHandle) {
         match event {
             Event::Pointer(pointer_event) => match pointer_event {
-                crate::event::PointerEvent::Motion {
+                PointerEvent::Motion {
                     time: _,
                     relative_x,
                     relative_y,
                 } => {
                     self.relative_motion(relative_x as i32, relative_y as i32);
                 }
-                crate::event::PointerEvent::Button { .. } => {}
-                crate::event::PointerEvent::Axis { .. } => {}
-                crate::event::PointerEvent::Frame {} => {}
+                PointerEvent::Button { time: _, button, state } => {
+                    self.emulate_mouse_button(button, state);
+                }
+                PointerEvent::Axis { time: _, axis, value } => {
+                    self.emulate_scroll(axis, value);
+                }
+                PointerEvent::Frame {} => {}
             },
             Event::Keyboard(_) => {}
             _ => {}
         }
+        unsafe {
+            xlib::XFlush(self.display);
+        }
     }
 
     async fn notify(&mut self, _: crate::client::ClientEvent) {
diff --git a/src/event.rs b/src/event.rs
index 32ab695..4a65a01 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -7,6 +7,8 @@ use std::{
 pub const BTN_LEFT: u32 = 0x110;
 pub const BTN_RIGHT: u32 = 0x111;
 pub const BTN_MIDDLE: u32 = 0x112;
+pub const BTN_BACK: u32 = 0x113;
+pub const BTN_FORWARD: u32 = 0x114;
 
 #[derive(Debug, Clone, Copy)]
 pub enum PointerEvent {