Add customisation for dialog button text.

Needed a small addition to set button text as well

dialog/base.go

@@ -9,9 +9,10 @@ import (
 	"github.com/fyne-io/fyne/widget"
 )
 
-// Dialog is the common API for any dialog window
+// Dialog is the common API for any dialog window with a single dismiss button
 type Dialog interface {
 	Show()
+	SetDismissText(label string)
 }
 
 type dialog struct {
@@ -20,6 +21,8 @@ type dialog struct {
 	content  fyne.CanvasObject
 	icon     fyne.Resource
 
+	dismiss *widget.Button
+
 	response  chan bool
 	responded bool
 }
@@ -126,25 +129,28 @@ func (d *dialog) Show() {
 	d.win.Show()
 }
 
+// SetDismissText allows custom text to be set in the confirmation button
+func (d *dialog) SetDismissText(label string) {
+	d.dismiss.SetText(label)
+}
+
 // ShowCustom shows a dialog over the specified application using custom
-// content. The MinSize() of the CanvasObject passed will be used to set
-// the size of the window.
-func ShowCustom(title, confirm string, content fyne.CanvasObject, parent fyne.Window) {
+// content. The button will have th dismiss text set.
+// The MinSize() of the CanvasObject passed will be used to set the size of the window.
+func ShowCustom(title, dismiss string, content fyne.CanvasObject, parent fyne.Window) {
 	d := &dialog{content: content, icon: nil}
 
 	win := newDialogWin(title, parent)
 	win.SetOnClosed(d.closed)
 	d.win = win
 	d.response = make(chan bool, 1)
 
-	d.setButtons(widget.NewHBox(layout.NewSpacer(),
-		&widget.Button{Text: confirm, Style: widget.PrimaryButton,
-			OnTapped: func() {
-				d.response <- false
-			},
+	d.dismiss = &widget.Button{Text: dismiss,
+		OnTapped: func() {
+			d.response <- false
 		},
-		layout.NewSpacer()),
-	)
+	}
+	d.setButtons(widget.NewHBox(layout.NewSpacer(), d.dismiss, layout.NewSpacer()))
 
 	d.Show()
 }

dialog/confirm.go

@@ -6,25 +6,37 @@ import (
 	"github.com/fyne-io/fyne/widget"
 )
 
+// ConfirmDialog is like the standard Dialog but with an additional confirmation button
+type ConfirmDialog struct {
+	*dialog
+
+	confirm *widget.Button
+}
+
+// SetConfirmText allows custom text to be set in the confirmation button
+func (d *ConfirmDialog) SetConfirmText(label string) {
+	d.confirm.SetText(label)
+}
+
 // NewConfirm creates a dialog over the specified window for user confirmation.
 // The title is used for the ialog window and message is the content.
 // The callback is executed when the user decides. After creation you should call Show().
-func NewConfirm(title, message string, callback func(bool), parent fyne.Window) Dialog {
+func NewConfirm(title, message string, callback func(bool), parent fyne.Window) *ConfirmDialog {
 	d := newDialog(title, message, theme.QuestionIcon(), callback, parent)
-	d.setButtons(newButtonList(
-		&widget.Button{Text: "No",
-			OnTapped: func() {
-				d.response <- false
-			},
+
+	d.dismiss = &widget.Button{Text: "No",
+		OnTapped: func() {
+			d.response <- false
 		},
-		&widget.Button{Text: "Yes", Style: widget.PrimaryButton,
-			OnTapped: func() {
-				d.response <- true
-			},
+	}
+	confirm := &widget.Button{Text: "Yes", Style: widget.PrimaryButton,
+		OnTapped: func() {
+			d.response <- true
 		},
-	))
+	}
+	d.setButtons(newButtonList(d.dismiss, confirm))
 
-	return d
+	return &ConfirmDialog{d, confirm}
 }
 
 // ShowConfirm shows a dialog over the specified window for a user

dialog/information.go

@@ -11,11 +11,13 @@ import (
 // After creation you should call Show().
 func NewInformation(title, message string, parent fyne.Window) Dialog {
 	d := newDialog(title, message, theme.InfoIcon(), nil, parent)
-	d.setButtons(newButtonList(&widget.Button{Text: "OK", Style: widget.PrimaryButton,
+
+	d.dismiss = &widget.Button{Text: "OK",
 		OnTapped: func() {
 			d.response <- false
 		},
-	}))
+	}
+	d.setButtons(newButtonList(d.dismiss))
 
 	return d
 }

examples/main.go

@@ -66,7 +66,10 @@ func main() {
 				dialog.ShowError(err, w)
 			}},
 			&W.Button{Text: "Confirm", OnTapped: func() {
-				dialog.ShowConfirm("Confirmation", "Do you want to confirm?", confirmCallback, w)
+				cnf := dialog.NewConfirm("Confirmation", "Are you enjoying this demo?", confirmCallback, w)
+				cnf.SetDismissText("Nah")
+				cnf.SetConfirmText("Oh Yes!")
+				cnf.Show()
 			}},
 			&W.Button{Text: "Custom", OnTapped: func() {
 				dialog.ShowCustom("MyDialog", "Nice", &W.Check{Text: "Inside a dialog"}, w)

widget/button.go

@@ -128,6 +128,14 @@ func (b *Button) Renderer() fyne.WidgetRenderer {
 	return b.renderer
 }
 
+// SetText allows the button label to be changed
+func (b *Button) SetText(text string) {
+	b.Text = text
+	b.Renderer().(*buttonRenderer).label.Text = text
+
+	b.Renderer().Refresh()
+}
+
 // NewButton creates a new button widget with the set label and tap handler
 func NewButton(label string, tapped func()) *Button {
 	button := &Button{baseWidget{}, label, DefaultButton, nil, tapped}