Add a dialog.ShowCustom function for handling bespoke needs

This is a pretty simple wrapper but could do more in the future.

dialog/base.go

@@ -72,12 +72,18 @@ func (d *dialog) MinSize(obj []fyne.CanvasObject) fyne.Size {
 		textMin.Height+btnMin.Height+theme.Padding()+32)
 }
 
+func newDialogWin(title string, parent fyne.App) fyne.Window {
+	win := parent.NewWindow(title)
+	win.SetFixedSize(true)
+
+	return win
+}
+
 func newDialog(title, message string, icon fyne.Resource, callback func(bool), parent fyne.App) *dialog {
 	dialog := &dialog{message: message, icon: icon}
 
-	win := parent.NewWindow(title)
+	win := newDialogWin(title, parent)
 	win.SetOnClosed(dialog.closed)
-	win.SetFixedSize(true)
 
 	dialog.win = win
 	dialog.response = make(chan bool, 1)
@@ -101,3 +107,13 @@ func newButtonList(buttons ...*widget.Button) fyne.CanvasObject {
 
 	return list
 }
+
+// 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 string, content fyne.CanvasObject, parent fyne.App) {
+	win := newDialogWin(title, parent)
+
+	win.SetContent(content)
+	win.Show()
+}

examples/main.go

@@ -83,6 +83,9 @@ func welcome(app fyne.App) {
 			&W.Button{Text: "Confirm", OnTapped: func() {
 				dialog.ShowConfirm("Confirmation", "Do you want to confirm?", confirmCallback, app)
 			}},
+			&W.Button{Text: "Custom", OnTapped: func() {
+				dialog.ShowCustom("Custom Dialog", &W.Check{Text: "Inside a dialog"}, app)
+			}},
 		}...),
 		layout.NewSpacer(),
 

window.go

@@ -19,7 +19,7 @@ type Window interface {
 	FixedSize() bool
 	// SetFixedSize sets a hint that states whether the window should be a fixed
 	// size or allow resizing.
-	SetFixedSize(b bool)
+	SetFixedSize(bool)
 
 	SetOnClosed(func())