Made Button.Clicked a callback.

button.go

@@ -4,6 +4,11 @@ package ui
 
 // A Button represents a clickable button with some text.
 type Button struct {
+	// Clicked is called when the button is clicked.
+	// This cannot be changed after the Window containing the Button has been created.
+	// If you do not specify a handler, a default of "do nothing" will be used instead.
+	Clicked func()
+
 	created  bool
 	sysData  *sysData
 	initText string
@@ -35,8 +40,9 @@ func (b *Button) Text() string {
 }
 
 func (b *Button) make(window *sysData) error {
-	b.sysData.event = func() {
+	b.sysData.event = b.Clicked
-		window.winhandler.Event(Clicked, b)
+	if b.sysData.event == nil {
+		b.sysData.event = func() {}
 	}
 	err := b.sysData.make(window)
 	if err != nil {

test/main.go

@@ -44,6 +44,9 @@ func gridWindow() *Window {
 	l20 := NewLabel("2,0")
 	c21 := NewCheckbox("2,1")
 	c21.SetChecked(true)
+	b12.Clicked = func() {
+		c21.SetChecked(!c21.Checked())
+	}
 	l22 := NewLabel("2,2")
 	g := NewGrid(3,
 		b00, b01, b02,
@@ -53,11 +56,6 @@ func gridWindow() *Window {
 	g.SetStretchy(1, 1)
 	w.SetSpaced(*spacingTest)
 	w.Open(g)
-//TODO
-//	go func() {for {select {
-//	case <-b12.Clicked:
-//		c21.SetChecked(!c21.Checked())
-//	}}}()
 	return w
 }
 
@@ -224,12 +222,26 @@ func areaTest() {
 	widthbox := NewLineEdit("320")
 	heightbox := NewLineEdit("240")
 	resize := NewButton("Resize")
+	resize.Clicked = func() {
+		width, err := strconv.Atoi(widthbox.Text())
+		if err != nil { println(err); return }
+		height, err := strconv.Atoi(heightbox.Text())
+		if err != nil { println(err); return }
+		a.SetSize(width, height)
+	}
 	sizeStack := NewHorizontalStack(widthbox, heightbox, resize)
 	sizeStack.SetStretchy(0)
 	sizeStack.SetStretchy(1)
 	sizeStack.SetStretchy(2)
 	modaltest := NewButton("Modal")
+	modaltest.Clicked = func() {
+		MsgBox("Modal Test", "")
+	}
 	repainttest := NewButton("Repaint All")
+	repainttest.Clicked = func() {
+		areahandler.mutate()
+		a.RepaintAll()
+	}
 	sizeStack = NewHorizontalStack(sizeStack, repainttest, modaltest)
 	sizeStack.SetStretchy(0)
 	sizeStack.SetStretchy(1)
@@ -270,22 +282,6 @@ type areatestwinhandler struct {
 	repainttest	*Button
 }
 func (a *areatestwinhandler) Event(e Event, d interface{}) {
-	switch e {
-	case Clicked:
-		switch d {
-		case a.resize:
-			width, err := strconv.Atoi(a.widthbox.Text())
-			if err != nil { println(err); return }
-			height, err := strconv.Atoi(a.heightbox.Text())
-			if err != nil { println(err); return }
-			a.a.SetSize(width, height)
-		case a.modaltest:
-			MsgBox("Modal Test", "")
-		case a.repainttest:
-			a.areahandler.mutate()
-			a.a.RepaintAll()
-		}
-	}
 }
 
 var areabounds = flag.Bool("areabounds", false, "run area bounds test instead")
@@ -426,6 +422,7 @@ func runMainTest() {
 		invalidTest(handler.cb1, handler.lb1, s, NewGrid(1, Space()))
 	}
 	handler.w.SetSpaced(*spacingTest)
+	handler.setUpEvents()
 	handler.w.Open(s)
 	if *gridtest {
 		gridWindow()
@@ -445,6 +442,7 @@ func runMainTest() {
 //		send:			w.Send,
 	}
 	dh.w = NewWindow("Dialogs", 200, 200, dh)
+	dh.setUpEvents()
 	if *dialogTest {
 		s := NewVerticalStack(
 			dialog_bMsgBox,
@@ -488,11 +486,11 @@ func runMainTest() {
 	}
 }
 
-func (handler *testwinhandler) Event(e Event, d interface{}) {
+// TODO
-	switch e {
+func (handler *testwinhandler) Event(Event,interface{}){}
-	case Clicked:
+
-		switch d {
+func (handler *testwinhandler) setUpEvents() {
-		case handler.b:
+	handler.b.Clicked = func() {
 		handler.w.SetTitle(fmt.Sprintf("%v | %s | %s | %s | %s",
 			handler.c.Checked(),
 			handler.cb1.Selection(),
@@ -500,7 +498,8 @@ func (handler *testwinhandler) Event(e Event, d interface{}) {
 			handler.e.Text(),
 			handler.password.Text()))
 		handler.doAdjustments()
-		case handler.b2:
+	}
+	handler.b2.Clicked = func() {
 		if handler.cb1.Len() > 1 {
 			handler.cb1.Delete(1)
 		}
@@ -513,7 +512,8 @@ func (handler *testwinhandler) Event(e Event, d interface{}) {
 		if handler.lb2.Len() > 4 {
 			handler.lb2.Delete(4)
 		}
-		case handler.b3:
+	}
+	handler.b3.Clicked = func() {
 		f := MsgBox
 		if handler.c.Checked() {
 			f = MsgBoxError
@@ -524,7 +524,8 @@ func (handler *testwinhandler) Event(e Event, d interface{}) {
 			handler.cb2.SelectedIndex(), handler.cb2.Selection(), handler.cb2.Len(),
 			handler.lb1.SelectedIndices(), handler.lb1.Selection(), handler.lb1.Len(),
 			handler.lb2.SelectedIndices(), handler.lb2.Selection(), handler.lb2.Len()))
-		case handler.incButton:
+	}
+	handler.incButton.Clicked = func() {
 		handler.prog++
 		if handler.prog > 100 {
 			handler.prog = 100
@@ -532,17 +533,21 @@ func (handler *testwinhandler) Event(e Event, d interface{}) {
 		handler.pbar.SetProgress(handler.prog)
 		handler.cb1.Append("append multi 1", "append multi 2")
 		handler.lb2.Append("append multi 1", "append multi 2")
-		case handler.decButton:
+	}
+	handler.decButton.Clicked = func() {
 		handler.prog--
 		if handler.prog < 0 {
 			handler.prog = 0
 		}
 		handler.pbar.SetProgress(handler.prog)
-		case handler.indetButton:
+	}
+	handler.indetButton.Clicked = func() {
 		handler.pbar.SetProgress(-1)
-		case handler.invalidButton:
+	}
+	handler.invalidButton.Clicked = func() {
 		invalidTest(handler.cb1, handler.lb1, nil, nil)
-		case handler.bmsg:
+	}
+	handler.bmsg.Clicked = func() {
 		MsgBox("Title Only, no parent", "")
 		handler.w.MsgBox("Title and Text", "parent")
 	}
@@ -552,7 +557,6 @@ func (handler *testwinhandler) Event(e Event, d interface{}) {
 //	case CustomEvent + 1:
 //			resetl()
 }
-}
 
 type dialoghandler struct {
 	bMsgBox			*Button
@@ -563,20 +567,21 @@ type dialoghandler struct {
 }
 
 // == TODO ==
-func (handler *dialoghandler) Event(e Event, d interface{}) {
+func (handler *dialoghandler) Event(e Event, d interface{}) {}
-	if e == Clicked {
+
-		switch d {
+func (handler *dialoghandler) setUpEvents() {
-		case handler.bMsgBox:
+	handler.bMsgBox.Clicked = func() {
 //		handler.send(CustomEvent, "DIALOG")
 		handler.w.MsgBox("Message Box", "Dismiss")
 //		handler.send(CustomEvent, nil)
-		case handler.bMsgBoxError:
+	}
+	handler.bMsgBoxError.Clicked = func() {
 //		handler.send(CustomEvent, "DIALOG")
 		handler.w.MsgBoxError("Message Box", "Dismiss")
 //		handler.send(CustomEvent, nil)
-		case handler.bCenter:
-			handler.w.Center()
 	}
+	handler.bCenter.Clicked = func() {
+		handler.w.Center()
 	}
 }