core: centralize EventQueue and EventIterator declaration

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

src/core/Darwin.zig

@@ -19,21 +19,12 @@ const objc = @import("objc");
 
 const log = std.log.scoped(.mach);
 
-const EventQueue = std.fifo.LinearFifo(Event, .Dynamic);
-pub const EventIterator = struct {
-    queue: *EventQueue,
-
-    pub inline fn next(self: *EventIterator) ?Event {
-        return self.queue.readItem();
-    }
-};
-
 pub const Darwin = @This();
 
 allocator: std.mem.Allocator,
 core: *Core,
 
-events: EventQueue,
+events: Core.EventQueue,
 input_state: Core.InputState,
 // modifiers: KeyMods,
 
@@ -148,8 +139,8 @@ pub fn update(_: *Darwin) !void {
 }
 
 // May be called from any thread.
-pub inline fn pollEvents(n: *Darwin) EventIterator {
-    return EventIterator{ .queue = &n.events };
+pub inline fn pollEvents(n: *Darwin) Core.EventIterator {
+    return .{ .queue = &n.events };
 }
 
 // May be called from any thread.

src/core/Null.zig

@@ -21,21 +21,12 @@ const KeyMods = Core.KeyMods;
 
 const log = std.log.scoped(.mach);
 
-const EventQueue = std.fifo.LinearFifo(Event, .Dynamic);
-pub const EventIterator = struct {
-    queue: *EventQueue,
-
-    pub inline fn next(self: *EventIterator) ?Event {
-        return self.queue.readItem();
-    }
-};
-
 pub const Null = @This();
 
 allocator: std.mem.Allocator,
 core: *Core,
 
-events: EventQueue,
+events: Core.EventQueue,
 input_state: Core.InputState,
 modifiers: KeyMods,
 
@@ -65,8 +56,8 @@ pub fn update(_: *Null) !void {
 }
 
 // May be called from any thread.
-pub inline fn pollEvents(n: *Null) EventIterator {
-    return EventIterator{ .queue = &n.events };
+pub inline fn pollEvents(n: *Null) Core.EventIterator {
+    return .{ .queue = &n.events };
 }
 
 // May be called from any thread.

src/core/Windows.zig

@@ -151,14 +151,6 @@ pub fn update(self: *Win32) !void {
     }
 }
 
-pub const EventIterator = struct {
-    queue: *EventQueue,
-
-    pub fn next(self: *EventIterator) ?Event {
-        return self.queue.readItem();
-    }
-};
-
 pub fn pollEvents(self: *Win32) EventIterator {
     return .{ .queue = &self.events };
 }