Added setKeyboardCallback and update variants

src/main.zig

@@ -41,6 +41,7 @@ const State = struct {
     },
     rectangle_width: f32 = @intToFloat(f32, Width) / 3.0,
     rectangle_height: f32 = @intToFloat(f32, Height) / 3.0,
+    paused: bool = false,
 
     pub fn init(alloc: std.mem.Allocator, period: f64) !State {
         var timer = try alloc.create(mfb.Timer);
@@ -195,6 +196,15 @@ fn handleMouseScroll(win: mfb.Window(State), key_mod: mfb.KeyMod, delta_x: f32,
     }
 }
 
+fn handleKeyboard(win: mfb.Window(State), key: mfb.Key, _: mfb.KeyMod, is_pressed: bool) callconv(.C) void {
+    if (key == mfb.Key.escape and is_pressed) {
+        win.close();
+    } else if (key == mfb.Key.space and is_pressed) {
+        var state = win.getUserData().?;
+        state.*.paused = !state.*.paused;
+    }
+}
+
 pub fn main() !void {
     var gp_allocator = std.heap.GeneralPurposeAllocator(.{}){};
     const alloc = gp_allocator.allocator();
@@ -213,6 +223,7 @@ pub fn main() !void {
     win.setMouseButtonCallback(handleMouseButton);
     win.setMouseMoveCallback(handleMouseMove);
     win.setMouseScrollCallback(handleMouseScroll);
+    win.setKeyboardCallback(handleKeyboard);
 
     var buf = try Buffer.init(alloc, Width, Height);
     defer buf.deinit();
@@ -221,6 +232,10 @@ pub fn main() !void {
     while (win.waitSync()) {
         state.render(buf);
         // TODO Handle mfb state
-        _ = win.update(buf.slice) catch unreachable;
+        if (state.paused) {
+            _ = win.updateEvents() catch unreachable;
+        } else {
+            _ = win.update(buf.slice) catch unreachable;
+        }
     }
 }