Method SetModel

treeview.go:130–201

(model TreeModel)

}

func (tv *TreeView) SetModel(model TreeModel) error {
	if tv.model != nil {
		tv.model.ItemsReset().Detach(tv.itemsResetEventHandlerHandle)
		tv.model.ItemChanged().Detach(tv.itemChangedEventHandlerHandle)
		tv.model.ItemInserted().Detach(tv.itemInsertedEventHandlerHandle)
		tv.model.ItemRemoved().Detach(tv.itemRemovedEventHandlerHandle)

		tv.disposeImageListAndCaches()
	}

	tv.model = model

	if model != nil {
		tv.lazyPopulation = model.LazyPopulation()

		tv.itemsResetEventHandlerHandle = model.ItemsReset().Attach(func(parent TreeItem) {
			if parent == nil {
				tv.resetItems()
			} else if tv.item2Info[parent] != nil {
				tv.SetSuspended(true)
				defer tv.SetSuspended(false)

				if err := tv.removeDescendants(parent); err != nil {
					return
				}

				if err := tv.insertChildren(parent); err != nil {
					return
				}
			}
		})

		tv.itemChangedEventHandlerHandle = model.ItemChanged().Attach(func(item TreeItem) {
			if item == nil || tv.item2Info[item] == nil {
				return
			}

			if err := tv.updateItem(item); err != nil {
				return
			}
		})

		tv.itemInsertedEventHandlerHandle = model.ItemInserted().Attach(func(item TreeItem) {
			tv.SetSuspended(true)
			defer tv.SetSuspended(false)

			var hInsertAfter win.HTREEITEM
			parent := item.Parent()
			for i := parent.ChildCount() - 1; i >= 0; i-- {
				if parent.ChildAt(i) == item {
					if i > 0 {
						hInsertAfter = tv.item2Info[parent.ChildAt(i-1)].handle
					} else {
						hInsertAfter = win.TVI_FIRST
					}
				}
			}