Created
July 18, 2024 22:17
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Fyne layout to auto-scroll a container.Scroll when resized
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| package ui | |
| import ( | |
| "fyne.io/fyne/v2" | |
| "fyne.io/fyne/v2/container" | |
| log "github.com/sirupsen/logrus" | |
| ) | |
| type autoscollLayout struct { | |
| lastHeight float32 | |
| } | |
| func (mal *autoscollLayout) Layout(objects []fyne.CanvasObject, size fyne.Size) { | |
| if len(objects) != 1 { | |
| log.WithFields(log.Fields{ | |
| "oject_count": len(objects), | |
| }).Fatal("cannot create autoscollLayout with multiple objects") | |
| } | |
| embedded := objects[0] | |
| embedded.Move(fyne.Position{0, 0}) | |
| embedded.Resize(size) | |
| s, ok := embedded.(*container.Scroll) | |
| if !ok { | |
| log.Fatal("cannot create autoscollLayout with anything other than container.Scroll") | |
| } | |
| if mal.lastHeight != 0 { | |
| if size.Height < mal.lastHeight { | |
| diff := mal.lastHeight - size.Height | |
| s.Offset.Y += diff | |
| s.Refresh() | |
| } else { | |
| diff := size.Height - mal.lastHeight | |
| if s.Content.Size().Height-mal.lastHeight == s.Offset.Y+diff { | |
| s.ScrollToBottom() | |
| } else { | |
| s.Offset.Y -= diff | |
| s.Refresh() | |
| } | |
| } | |
| } | |
| mal.lastHeight = size.Height | |
| } | |
| func (mal *autoscollLayout) MinSize(objects []fyne.CanvasObject) fyne.Size { | |
| if len(objects) != 1 { | |
| log.WithFields(log.Fields{ | |
| "oject_count": len(objects), | |
| }).Fatal("cannot create autoscollLayout with multiple objects") | |
| } | |
| return objects[0].MinSize() | |
| } |
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