--- a/tk/events.d	Sun Jul 12 13:23:06 2009 +0930
+++ b/tk/events.d	Mon Jul 13 16:16:17 2009 +0930
@@ -1,14 +1,16 @@
 module tk.events;
 
-import tk.types;
-import tk.geometry;
+public {
+    import tk.types;
+    import tk.geometry;
+}
 
 abstract class Event {
-    this(Mask mask) {
+    this(in Mask mask) {
         mMask = mask;
     }
 
-    const(Mask) mask() const { return mMask; }
+    Mask mask() const { return mMask; }
 
     private {
         Mask mMask;
@@ -16,7 +18,7 @@
 }
 
 final class CrossingEvent : Event {
-    this(Mask mask) {
+    this(in Mask mask) {
         super(mask);
     }
 
@@ -25,7 +27,7 @@
 }
 
 final class KeyEvent : Event {
-    this(string str, uint value, Mask mask) {
+    this(in string str, in uint value, in Mask mask) {
         super(mask);
         mStr = str;
         mValue = value;
@@ -44,7 +46,7 @@
 }
 
 abstract class PointerEvent : Event {
-    this(in Point screen_point, in Point model_point, Mask mask) {
+    this(in Point screen_point, in Point model_point, in Mask mask) {
         super(mask);
         mScreenPoint = screen_point;
         mModelPoint = model_point;
@@ -60,11 +62,11 @@
 }
 
 final class ButtonEvent : PointerEvent {
-    this(ButtonAction button_action,
-         ButtonName button_name,
-         Point screen_point,
-         Point model_point,
-         Mask mask) {   
+    this(in ButtonAction button_action,
+         in ButtonName button_name,
+         in Point screen_point,
+         in Point model_point,
+         in Mask mask) {   
         super(screen_point, model_point, mask);
         mButtonAction = button_action;
         mButtonName = button_name;
@@ -88,7 +90,7 @@
 final class MotionEvent : PointerEvent {
     this(in Point screen_point,
          in Point model_point,
-         Mask mask) {
+         in Mask mask) {
         super(screen_point, model_point, mask);
     }
 
@@ -102,7 +104,7 @@
     this(in ScrollDirection scroll_direction,
          in Point screen_point,
          in Point model_point,
-         Mask mask) {
+         in Mask mask) {
         super(screen_point, model_point, mask);
         mScrollDirection = scroll_direction;
     }