From 08028c1e542db816280ac333d5a609f6ff0b8cf0 Mon Sep 17 00:00:00 2001
From: Daniel Collin <daniel@collin.com>
Date: Sat, 19 Dec 2015 08:25:04 +0100
Subject: [PATCH] WIP on Mac version

---
 src/macos.rs | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 128 insertions(+), 2 deletions(-)

diff --git a/src/macos.rs b/src/macos.rs
index b634b84..7c1150f 100644
--- a/src/macos.rs
+++ b/src/macos.rs
@@ -4,7 +4,7 @@ use Scale;
 use Vsync;
 use Key;
 
-//use libc;
+use libc;
 //use cocoa::appkit;
 use cocoa::appkit::*;
 //use cocoa::appkit::NSEventSubtype::*;
@@ -13,6 +13,7 @@ use cocoa::appkit::*;
 use cocoa::base::{id, nil};
 #[allow(unused_imports)]
 use objc::runtime::{Class, Object, Sel, BOOL, YES, NO};
+use objc::declare::ClassDecl;
 
 #[allow(unused_imports)]
 use cocoa::foundation::{NSAutoreleasePool, NSDate, NSDefaultRunLoopMode, NSPoint, NSRect, NSSize, 
@@ -23,8 +24,126 @@ use std::ops::Deref;
 pub struct Window {
     view: IdRef,
     window: IdRef,
+    delegate: WindowDelegate,
 }
 
+struct DelegateState {
+    view: IdRef,
+    window: IdRef,
+    resize_handler: Option<fn(u32, u32)>,
+}
+
+struct WindowDelegate {
+    state: Box<DelegateState>,
+    _this: IdRef,
+}
+
+//sthou
+
+impl WindowDelegate {
+    /// Get the delegate class, initiailizing it neccessary
+    fn class() -> *const Class {
+        use std::sync::{Once, ONCE_INIT};
+
+        extern fn window_should_close(this: &Object, _: Sel, _: id) -> BOOL {
+            unsafe {
+                let state: *mut libc::c_void = *this.get_ivar("glutinState");
+                let state = state as *mut DelegateState;
+                //(*state).pending_events.lock().unwrap().push_back(Closed);
+            }
+            YES
+        }
+
+        extern fn window_did_resize(this: &Object, _: Sel, _: id) {
+            unsafe {
+                let state: *mut libc::c_void = *this.get_ivar("glutinState");
+                let state = &mut *(state as *mut DelegateState);
+
+                //let _: () = msg_send![*state.context, update];
+
+                if let Some(handler) = state.resize_handler {
+                    let rect = NSView::frame(*state.view);
+                    let scale_factor = NSWindow::backingScaleFactor(*state.window) as f32;
+                    (handler)((scale_factor * rect.size.width as f32) as u32,
+                              (scale_factor * rect.size.height as f32) as u32);
+                }
+            }
+        }
+
+        extern fn window_did_become_key(this: &Object, _: Sel, _: id) {
+            unsafe {
+                // TODO: center the cursor if the window had mouse grab when it
+                // lost focus
+
+                let state: *mut libc::c_void = *this.get_ivar("glutinState");
+                let state = state as *mut DelegateState;
+                //(*state).pending_events.lock().unwrap().push_back(Focused(true));
+            }
+        }
+
+        extern fn window_did_resign_key(this: &Object, _: Sel, _: id) {
+            unsafe {
+                let state: *mut libc::c_void = *this.get_ivar("glutinState");
+                let state = state as *mut DelegateState;
+                //(*state).pending_events.lock().unwrap().push_back(Focused(false));
+            }
+        }
+
+        static mut delegate_class: *const Class = 0 as *const Class;
+        static INIT: Once = ONCE_INIT;
+
+        INIT.call_once(|| unsafe {
+            // Create new NSWindowDelegate
+            let superclass = Class::get("NSObject").unwrap();
+            let mut decl = ClassDecl::new(superclass, "GlutinWindowDelegate").unwrap();
+
+            // Add callback methods
+            decl.add_method(sel!(windowShouldClose:),
+                window_should_close as extern fn(&Object, Sel, id) -> BOOL);
+            decl.add_method(sel!(windowDidResize:),
+                window_did_resize as extern fn(&Object, Sel, id));
+            
+            decl.add_method(sel!(windowDidBecomeKey:),
+                window_did_become_key as extern fn(&Object, Sel, id));
+            decl.add_method(sel!(windowDidResignKey:),
+                window_did_resign_key as extern fn(&Object, Sel, id));
+
+            // Store internal state as user data
+            decl.add_ivar::<*mut libc::c_void>("glutinState");
+
+            delegate_class = decl.register();
+        });
+
+        unsafe {
+            delegate_class
+        }
+    }
+
+    fn new(state: DelegateState) -> WindowDelegate {
+        // Box the state so we can give a pointer to it
+        let mut state = Box::new(state);
+        let state_ptr: *mut DelegateState = &mut *state;
+        unsafe {
+            let delegate = IdRef::new(msg_send![WindowDelegate::class(), new]);
+
+            (&mut **delegate).set_ivar("glutinState", state_ptr as *mut libc::c_void);
+            let _: () = msg_send![*state.window, setDelegate:*delegate];
+
+            WindowDelegate { state: state, _this: delegate }
+        }
+    }
+}
+
+impl Drop for WindowDelegate {
+    fn drop(&mut self) {
+        unsafe {
+            // Nil the window's delegate so it doesn't still reference us
+            let _: () = msg_send![*self.state.window, setDelegate:nil];
+        }
+    }
+}
+
+
 impl Window {
     pub fn new(name: &str, width: usize, height: usize, _: Scale, _: Vsync) -> Result<Window, &str> {
         unsafe  {
@@ -51,11 +170,18 @@ impl Window {
 
             app.activateIgnoringOtherApps_(YES);
 
+            let ds = DelegateState {
+                view: view.clone(),
+                window: window.clone(),
+                resize_handler: None,
+            };
+
             println!("Created window and view");
 
             return Ok(Window {
                 window: window,
-                view: view
+                view: view,
+                delegate: WindowDelegate::new(ds),
             });
         }
     }