protected void AddItemToTheDocument(BuilderLibraryTreeItem item)
{
// If this is the uxml file entry of the currently open file, don't allow
// the user to instantiate it (infinite recursion) or re-open it.
var listOfOpenDocuments = m_PaneWindow.document.openUXMLFiles;
bool isCurrentDocumentOpen = listOfOpenDocuments.Any(doc => doc.uxmlFileName == item.name);
if (isCurrentDocumentOpen)
{
return;
}
if (m_PaneWindow.document.WillCauseCircularDependency(item.sourceAsset))
{
BuilderDialogsUtility.DisplayDialog(BuilderConstants.InvalidWouldCauseCircularDependencyMessage,
BuilderConstants.InvalidWouldCauseCircularDependencyMessageDescription, null);
return;
}
var newElement = item.makeVisualElementCallback?.Invoke();
if (newElement == null)
{
return;
}
if (item.makeElementAssetCallback != null && newElement is TemplateContainer tempContainer)
{
if (!BuilderAssetUtilities.ValidateAsset(item.sourceAsset, item.sourceAssetPath))
{
return;
}
}
var activeVTARootElement = m_DocumentRootElement.Query().Where(e => e.GetVisualTreeAsset() == m_PaneWindow.document.visualTreeAsset).First();
if (activeVTARootElement == null)
{
Debug.LogError("UI Builder has a bug. Could not find document root element for currently active open UXML document.");
return;
}
activeVTARootElement.Add(newElement);
if (item.makeElementAssetCallback == null)
{
BuilderAssetUtilities.AddElementToAsset(m_PaneWindow.document, newElement);
}
else
{
BuilderAssetUtilities.AddElementToAsset(
m_PaneWindow.document, newElement, item.makeElementAssetCallback);
}
m_Selection.NotifyOfHierarchyChange();
m_Selection.Select(null, newElement);
}
public bool LoadDocument(VisualTreeAsset visualTreeAsset, bool unloadAllSubdocuments = true, bool assetModifiedExternally = false, string assetPath = null)
{
if (!BuilderAssetUtilities.ValidateAsset(visualTreeAsset, assetPath))
{
return(false);
}
if (!document.CheckForUnsavedChanges(assetModifiedExternally))
{
return(false);
}
if (unloadAllSubdocuments)
{
document.GoToRootDocument(m_Viewport.documentRootElement, m_PaneWindow);
}
LoadDocumentInternal(visualTreeAsset);
return(true);
}
protected override void PerformAction(VisualElement destination, DestinationPane pane, Vector2 localMousePosition, int index = -1)
{
// We should have an item reference here if the OnDragStart() worked.
var item = m_LibraryItem;
var itemVTA = item.sourceAsset;
if (paneWindow.document.WillCauseCircularDependency(itemVTA))
{
BuilderDialogsUtility.DisplayDialog(BuilderConstants.InvalidWouldCauseCircularDependencyMessage,
BuilderConstants.InvalidWouldCauseCircularDependencyMessageDescription, BuilderConstants.DialogOkOption);
return;
}
if (item.makeElementAssetCallback != null && m_DragPreviewElement is TemplateContainer tempContainer)
{
if (!BuilderAssetUtilities.ValidateAsset(item.sourceAsset, item.sourceAssetPath))
{
return;
}
}
// Determine if it applies and use Absolute Island insertion.
if (BuilderProjectSettings.enableAbsolutePositionPlacement && pane == DestinationPane.Viewport && m_DragPreviewLastParent == documentRootElement && index < 0)
{
m_DragPreviewLastParent = BuilderPlacementUtilities.CreateAbsoluteIsland(paneWindow, documentRootElement, localMousePosition);
}
// Add VisualElement to Canvas.
m_DragPreviewElement.RemoveFromClassList(s_DragPreviewElementClassName);
if (index < 0)
{
m_DragPreviewLastParent.Add(m_DragPreviewElement);
}
else
{
m_DragPreviewLastParent.Insert(index, m_DragPreviewElement);
}
// Create equivalent VisualElementAsset.
if (item.makeElementAssetCallback == null)
{
BuilderAssetUtilities.AddElementToAsset(
paneWindow.document, m_DragPreviewElement, index);
}
else
{
BuilderAssetUtilities.AddElementToAsset(
paneWindow.document, m_DragPreviewElement, item.makeElementAssetCallback, index);
}
selection.NotifyOfHierarchyChange(null);
selection.NotifyOfStylingChange(null);
selection.Select(null, m_DragPreviewElement);
// Commit to the preview element as the final element.
// This will stop the ResetDragPreviewElement() from calling
// RemoveFromHierarchy() on it.
m_DragPreviewElement = null;
// If we dragged into the Viewport, focus the Viewport.
if (pane == DestinationPane.Viewport)
{
viewport.pane.Focus();
}
}
