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overlay_stack_test.go
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overlay_stack_test.go
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package internal_test
import (
"testing"
"github.com/stretchr/testify/assert"
"fyne.io/fyne"
"fyne.io/fyne/internal"
"fyne.io/fyne/test"
"fyne.io/fyne/widget"
)
func TestOverlayStack(t *testing.T) {
s := &internal.OverlayStack{Canvas: test.NewCanvas()}
o1 := widget.NewLabel("A")
o2 := widget.NewLabel("B")
o3 := widget.NewLabel("C")
o4 := widget.NewLabel("D")
o5 := widget.NewLabel("E")
// initial empty
assert.Empty(t, s.List())
assert.Nil(t, s.Top())
// add one & remove
s.Add(o1)
assert.Equal(t, []fyne.CanvasObject{o1}, s.List())
assert.Equal(t, o1, s.Top())
// remove other does nothing
s.Remove(o2)
assert.Equal(t, []fyne.CanvasObject{o1}, s.List())
assert.Equal(t, o1, s.Top())
// remove the correct one
s.Remove(o1)
assert.Empty(t, s.List())
assert.Nil(t, s.Top())
// add multiple & remove
s.Add(o1)
s.Add(o2)
s.Add(o3)
s.Add(o4)
s.Add(o5)
assert.Equal(t, []fyne.CanvasObject{o1, o2, o3, o4, o5}, s.List())
assert.Equal(t, o5, s.Top())
s.Remove(o5)
assert.Equal(t, []fyne.CanvasObject{o1, o2, o3, o4}, s.List())
assert.Equal(t, o4, s.Top())
// remove cuts the stack
s.Remove(o2)
assert.Equal(t, []fyne.CanvasObject{o1}, s.List())
assert.Equal(t, o1, s.Top())
s.Remove(o1)
assert.Empty(t, s.List())
assert.Nil(t, s.Top())
}