#79 - allow Windows to handle terminal resize event

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015 Vladimir V. Markelov <vmatroskin@gmail.com>
+Copyright (c) 2015-2018 Vladimir V. Markelov <vmatroskin@gmail.com>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

changelog

@@ -1,4 +1,8 @@
-2018-01-25 - version 0.7.0
+2018-01-26 - version 0.7.0
+[+] Added new event handler for Window: set a callback OnScreenResize if you
+    want to handle terminal resize event
+
+2018-01-25 - version 0.7.0
 [+] Added new methods to Composer: BeginUpdate and EndUpdate to use in
     multithreading application. Call BeginUpdate before creating a new Window or
     manipulating Composer Windows if the code runs in separate thread. And

composer.go

@@ -686,6 +686,11 @@ func ProcessEvent(ev Event) {
 				wnd.PlaceChildren()
 				RefreshScreen()
 			}
+
+			if wnd.onScreenResize != nil {
+				wnd.onScreenResize(ev)
+			}
+
 		}
 	case EventKey:
 		comp.processKey(ev)

window.go

@@ -20,8 +20,9 @@ type Window struct {
 	immovable  bool
 	fixedSize  bool
 
-	onClose   func(Event) bool
+	onClose        func(Event) bool
-	onKeyDown func(Event) bool
+	onKeyDown      func(Event) bool
+	onScreenResize func(Event)
 }
 
 func CreateWindow(x, y, w, h int, title string) *Window {
@@ -256,14 +257,22 @@ func (c *Window) ProcessEvent(ev Event) bool {
 	return false
 }
 
+// OnClose sets the callback that is called when the Window is about to destroy
 func (w *Window) OnClose(fn func(Event) bool) {
 	w.onClose = fn
 }
 
+// OnKeyDown sets the callback that is called when a user presses a key
+// while the Window is active
 func (w *Window) OnKeyDown(fn func(Event) bool) {
 	w.onKeyDown = fn
 }
 
+// OnScreenResize sets the callback that is called when size of terminal changes
+func (w *Window) OnScreenResize(fn func(Event)) {
+	w.onScreenResize = fn
+}
+
 // SetMaximized opens the view to full screen or restores its
 // previous size
 func (w *Window) SetMaximized(maximize bool) {