Add Mouse drag support.

This concludes the first 'release' :p.

1 files changed, 37 insertions, 1 deletions

diff --git a/src/command.rs b/src/command.rs
index f5e3e83..eaadf77 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -17,7 +17,7 @@ use x11::xlib::{XEvent, GrabModeAsync};
 
 use dotwm::DotWM;
 use dotwm::NetAtom;
-use safe_x11::{grab_key,ungrab_key};
+use safe_x11::{grab_key,ungrab_key,grab_button,ungrab_button};
 
 const WNOHANG: c_int = 0x00000001;
 
@@ -132,6 +132,25 @@ pub fn move_win_sticky(wm: &mut DotWM, _: xlib::XEvent, args: &[String]) -> bool
     true
 }
 
+/// Drag the window. for now the dragging is relative to the center of the
+/// window because win.cursor_coords is always `None`. Later we should
+/// be able to `XGrabButton` on the child windows (not only on the root) and
+/// set `win.cursor_coords` respectively.
+pub fn move_win_drag(wm: &mut DotWM, e: xlib::XEvent, _: &[String]) -> bool {
+    let ev = xlib::XMotionEvent::from(e);
+    if let Some(ref win) = wm.current_window() {
+        let attr = win.attributes();
+        let (x0, y0) = win.cursor_coords.unwrap_or((attr.width/2, attr.height/2));
+        // Move around the center of the cursor.
+        let x = ev.x - x0;
+        let y = ev.y - y0;
+        win.move_to(x, y).is_ok()
+    } else {
+        println!("move_win_drag - nop");
+        false
+    }
+}
+
 /// Resize the window certain amount in x and y.
 pub fn resize_win(wm: &mut DotWM, _: xlib::XEvent, args: &[String]) -> bool {
     let w = args[0].parse::<i32>().unwrap();
@@ -222,6 +241,23 @@ pub fn add_binding(wm: &mut DotWM, bindings: &mut BindingHash,
         bindings.insert((key, modifiers), (func, v));
 }
 
+/// Add a button binding to the WM.
+pub fn add_button_binding(wm: &mut DotWM, bindings: &mut BindingHash,
+                          button: u32, modifiers: u32, func: ExecFn, args: &[&str]) {
+    ungrab_button(wm.display, button, modifiers);
+    grab_button(wm.display, button, modifiers, true,
+                xlib::ButtonPressMask|xlib::ButtonReleaseMask|xlib::PointerMotionMask,
+                GrabModeAsync, GrabModeAsync, 0, 0);
+    let mut v = vec![];
+    for arg in args {
+        v.push(arg.to_string());
+    }
+    // for now we need the button1Mask here
+    bindings.insert((button, modifiers | xlib::Button1Mask), (func, v));
+}
+
+/// Change the desktop, args parameter only have one usize on it that is the
+/// index of the desktop (i.e.: 0 for the first, 1 for the second, etc).
 pub fn change_desktop(wm: &mut DotWM, _: xlib::XEvent, args: &[String]) -> bool {
     let num = args[0].parse::<usize>().unwrap();
     wm.change_desktop(num);