Added getters for some callback functions. Resolves #65

application.go

@@ -59,6 +59,12 @@ func (a *Application) SetInputCapture(capture func(event *tcell.EventKey) *tcell
 	return a
 }
 
+// GetInputCapture returns the function installed with SetInputCapture() or nil
+// if no such function has been installed.
+func (a *Application) GetInputCapture() func(event *tcell.EventKey) *tcell.EventKey {
+	return a.inputCapture
+}
+
 // Run starts the application and thus the event loop. This function returns
 // when Stop() was called.
 func (a *Application) Run() error {
@@ -214,6 +220,12 @@ func (a *Application) SetBeforeDrawFunc(handler func(screen tcell.Screen) bool)
 	return a
 }
 
+// GetBeforeDrawFunc returns the callback function installed with
+// SetBeforeDrawFunc() or nil if none has been installed.
+func (a *Application) GetBeforeDrawFunc() func(screen tcell.Screen) bool {
+	return a.beforeDraw
+}
+
 // SetAfterDrawFunc installs a callback function which is invoked after the root
 // primitive was drawn during screen updates.
 //
@@ -223,6 +235,12 @@ func (a *Application) SetAfterDrawFunc(handler func(screen tcell.Screen)) *Appli
 	return a
 }
 
+// GetAfterDrawFunc returns the callback function installed with
+// SetAfterDrawFunc() or nil if none has been installed.
+func (a *Application) GetAfterDrawFunc() func(screen tcell.Screen) {
+	return a.afterDraw
+}
+
 // SetRoot sets the root primitive for this application. If "fullscreen" is set
 // to true, the root primitive's position will be changed to fill the screen.
 //

box.go

@@ -124,6 +124,12 @@ func (b *Box) SetDrawFunc(handler func(screen tcell.Screen, x, y, width, height
 	return b
 }
 
+// GetDrawFunc returns the callback function which was installed with
+// SetDrawFunc() or nil if no such function has been installed.
+func (b *Box) GetDrawFunc() func(screen tcell.Screen, x, y, width, height int) (int, int, int, int) {
+	return b.draw
+}
+
 // wrapInputHandler wraps an input handler (see InputHandler()) with the
 // functionality to capture input (see SetInputCapture()) before passing it
 // on to the provided (default) input handler.
@@ -155,6 +161,12 @@ func (b *Box) SetInputCapture(capture func(event *tcell.EventKey) *tcell.EventKe
 	return b
 }
 
+// GetInputCapture returns the function installed with SetInputCapture() or nil
+// if no such function has been installed.
+func (b *Box) GetInputCapture() func(event *tcell.EventKey) *tcell.EventKey {
+	return b.inputCapture
+}
+
 // SetBackgroundColor sets the box's background color.
 func (b *Box) SetBackgroundColor(color tcell.Color) *Box {
 	b.backgroundColor = color