Merge pull request #227 from aepsil0n/grab-cursor

Implement grabbing of the mouse pointer for X11

2 files changed, 42 insertions, 0 deletions

diff --git a/src/x11/ffi.rs b/src/x11/ffi.rs
index 1d91cab..e33ea24 100644
--- a/src/x11/ffi.rs
+++ b/src/x11/ffi.rs
@@ -42,6 +42,17 @@ pub const Button5: libc::c_uint = 5;
 pub const InputOutput: libc::c_uint = 1;
 pub const InputOnly: libc::c_uint = 2;
 
+pub const CurrentTime: Time = 0;
+
+pub const GrabModeSync: libc::c_int = 0;
+pub const GrabModeAsync: libc::c_int = 1;
+
+pub const GrabSuccess: libc::c_int = 0;
+pub const AlreadyGrabbed: libc::c_int =  1;
+pub const GrabInvalidTime: libc::c_int = 2;
+pub const GrabNotViewable: libc::c_int = 3;
+pub const GrabFrozen: libc::c_int = 4;
+
 pub const CWBackPixmap: libc::c_ulong = (1<<0);
 pub const CWBackPixel: libc::c_ulong = (1<<1);
 pub const CWBorderPixmap: libc::c_ulong = (1<<2);
@@ -1470,6 +1481,10 @@ extern "C" {
 
     pub fn XcursorLibraryLoadCursor(dpy: *mut Display, name: *const libc::c_char) -> Cursor;
     pub fn XDefineCursor(dby: *mut Display, w: Window, cursor: Cursor);
+    pub fn XGrabPointer(dpy: *mut Display, w: Window, owner_events: bool, event_mask: libc::c_long,
+        pointer_mode: libc::c_int, keyboard_mode: libc::c_int, confine_to: Window, cursor: Cursor,
+        time: Time) -> libc::c_int;
+    pub fn XUngrabPointer(dpy: *mut Display, time: Time);
 }
 
 /*
diff --git a/src/x11/window/mod.rs b/src/x11/window/mod.rs
index 385a913..d576150 100644
--- a/src/x11/window/mod.rs
+++ b/src/x11/window/mod.rs
@@ -782,6 +782,33 @@ impl Window {
         }
     }
 
+    pub fn grab_cursor(&self) -> Result<(), String> {
+        unsafe {
+            match ffi::XGrabPointer(
+                self.x.display, self.x.window, false,
+                ffi::ButtonPressMask | ffi::ButtonReleaseMask | ffi::EnterWindowMask |
+                ffi::LeaveWindowMask | ffi::PointerMotionMask | ffi::PointerMotionHintMask |
+                ffi::Button1MotionMask | ffi::Button2MotionMask | ffi::Button3MotionMask |
+                ffi::Button4MotionMask | ffi::Button5MotionMask | ffi::ButtonMotionMask |
+                ffi::KeymapStateMask,
+                ffi::GrabModeAsync, ffi::GrabModeAsync,
+                self.x.window, 0, ffi::CurrentTime
+            ) {
+                ffi::GrabSuccess => Ok(()),
+                ffi::AlreadyGrabbed | ffi::GrabInvalidTime |
+                ffi::GrabNotViewable | ffi::GrabFrozen
+                    => Err("cursor could not be grabbed".to_string()),
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn ungrab_cursor(&self) {
+        unsafe {
+            ffi::XUngrabPointer(self.x.display, ffi::CurrentTime);
+        }
+    }
+
     pub fn hidpi_factor(&self) -> f32 {
         1.0
     }