@Override
public void dispose() {
if (myDndManager != null) {
if (myDropTarget != null) {
myDndManager.unregisterTarget(myDropTarget, myTree);
myDropTarget = null;
}
if (myDragSource != null) {
myDndManager.unregisterSource(myDragSource, myTree);
myDragSource = null;
}
myDndManager = null;
}
setTreeBuilder(null);
myTree = null;
myTreeStructure = null;
}
protected void enableDnD() {
if (!ApplicationManager.getApplication().isHeadlessEnvironment()) {
myDropTarget =
new ProjectViewDropTarget(
myTree,
new Retriever() {
@Override
public PsiElement getPsiElement(@Nullable TreeNode node) {
return getPSIElement(getElementFromTreeNode(node));
}
@Override
public Module getModule(TreeNode treeNode) {
return getNodeModule(getElementFromTreeNode(treeNode));
}
},
myProject);
myDragSource = new MyDragSource();
myDndManager = DnDManager.getInstance();
myDndManager.registerSource(myDragSource, myTree);
myDndManager.registerTarget(myDropTarget, myTree);
}
}