How Hide HandleItems of GraphicsItemResizer and show it when QGraphicsItem is selected.

[parisa-hr]

Hi I want to Resize my QGraphicsItem when it is selected , how can do this? I mean I want HandleItem 's squares to become hide and when the user selects one Item, they appear and user has resized access.

[cl0ne]

Hi!

I see (at least) two ways to accomplish what you want without modifying/inheriting from the GraphicsItemResizer:

• Listen for QGraphicsScene::selectionChanged and attach resizer to currently selected items, you have to track previously selected items though (to detach resizers from them);
• Listen for ItemSelectedHasChanged event in QGraphicsItem::itemChange of the items to be selectable and detach/attach GraphicsItemResizer as the parent item to the corresponding item.

Another option would be to use QGraphicsItem::installSceneEventFilter in the GraphicsItemResizer (or its subclass) to intercept selection events.

Hope this helps.

[parisa-hr]

Hi!

I see (at least) two ways to accomplish what you want without modifying/inheriting from the GraphicsItemResizer:

* Listen for [QGraphicsScene::selectionChanged](https://doc.qt.io/qt-5/qgraphicsscene.html#selectionChanged) and attach resizer to currently selected items, you have to track previously selected items though (to detach resizers from them);

* Listen for `ItemSelectedHasChanged` event in [QGraphicsItem::itemChange](https://doc.qt.io/qt-5/qgraphicsitem.html#itemChange) of the items to be selectable and detach/attach `GraphicsItemResizer` as the parent item to the corresponding item.

Another option would be to use QGraphicsItem::installSceneEventFilter in the GraphicsItemResizer (or its subclass) to intercept selection events.

Hope this helps.

Thanks.