Add mouse cursor support

Add a new api, window.set_cursor, for setting the cursor. The enum MouseCursor lists the possible cursors.

Only X11 is implemented. On OSX, Android, & Win32 the window.set_cursor function
either does nothing or calls the "unimplemented!" macro.

2 files changed, 49 insertions, 1 deletions

diff --git a/src/x11/ffi.rs b/src/x11/ffi.rs
index 0528720..5e7b5a1 100644
--- a/src/x11/ffi.rs
+++ b/src/x11/ffi.rs
@@ -1384,6 +1384,7 @@ extern "C" {
 #[link(name = "GL")]
 #[link(name = "X11")]
 #[link(name = "Xxf86vm")]
+#[link(name = "Xcursor")]
 extern "C" {
     pub fn XCloseDisplay(display: *mut Display);
     pub fn XCheckMaskEvent(display: *mut Display, event_mask: libc::c_long,
@@ -1454,6 +1455,9 @@ extern "C" {
         x: libc::c_int, y: libc::c_int) -> Bool;
     pub fn XF86VidModeGetAllModeLines(dpy: *mut Display, screen: libc::c_int,
         modecount_return: *mut libc::c_int, modesinfo: *mut *mut *mut XF86VidModeModeInfo) -> Bool;
+
+    pub fn XcursorLibraryLoadCursor(dpy: *mut Display, name: *const libc::c_char) -> Cursor;
+    pub fn XDefineCursor(dby: *mut Display, w: Window, cursor: Cursor);
 }
 
 /*
diff --git a/src/x11/window/mod.rs b/src/x11/window/mod.rs
index cff2c61..402beec 100644
--- a/src/x11/window/mod.rs
+++ b/src/x11/window/mod.rs
@@ -1,4 +1,4 @@
-use {Event, BuilderAttribs};
+use {Event, BuilderAttribs, MouseCursor};
 use CreationError;
 use CreationError::OsError;
 use libc;
@@ -611,4 +611,48 @@ impl Window {
 
     pub fn set_window_resize_callback(&mut self, _: Option<fn(uint, uint)>) {
     }
+
+    pub fn set_cursor(&self, cursor: MouseCursor) {
+        unsafe {
+            use std::ffi::CString;
+            let cursor_name = match cursor {
+                MouseCursor::Default => "left_ptr",
+                MouseCursor::Crosshair => "crosshair",
+                MouseCursor::Hand => "hand",
+                MouseCursor::Arrow => "arrow",
+                MouseCursor::Move => "fleur",
+                MouseCursor::Text => "xterm",
+                MouseCursor::Wait => "watch",
+                MouseCursor::Help => "question_arrow",
+                MouseCursor::Progress => "watch", // TODO: Find better matching X11 cursor
+                MouseCursor::EResize => "right_side",
+                MouseCursor::NResize => "top_side",
+                MouseCursor::NeResize => "top_right_corner",
+                MouseCursor::NwResize => "top_left_corner",
+                MouseCursor::SResize => "bottom_side",
+                MouseCursor::SeResize => "bottom_right_corner",
+                MouseCursor::SwResize => "bottom_left_corner",
+                MouseCursor::WResize => "left_side",
+                MouseCursor::EwResize => "h_double_arrow",
+                MouseCursor::NsResize => "v_double_arrow",
+
+                
+                MouseCursor::NeswResize | MouseCursor::NwseResize => "sizing", // TODO: Better matching X11 cursor
+                
+                MouseCursor::ColResize | MouseCursor::RowResize => "double_arrow", // TODO: Better matching X11 cursor
+
+                /// TODO: Find matching X11 cursors
+                MouseCursor::NotAllowed | MouseCursor::ContextMenu |
+                MouseCursor::NoneCursor | MouseCursor::Cell |
+                MouseCursor::VerticalText | MouseCursor::Alias |
+                MouseCursor::Copy | MouseCursor::NoDrop | MouseCursor::Grab |
+                MouseCursor::Grabbing | MouseCursor::AllScroll |
+                MouseCursor::ZoomIn | MouseCursor::ZoomOut => "left_ptr",
+            };
+            let c_string = CString::from_slice(cursor_name.as_bytes());
+            let xcursor = ffi::XcursorLibraryLoadCursor(self.x.display, c_string.as_ptr());
+            ffi::XDefineCursor (self.x.display, self.x.window, xcursor);
+            ffi::XFlush(self.x.display);
+        }
+    }
 }