private boolean canPasteBefore(EditorCell selectedCell, List<SNode> pasteNodes) {
if (!APICellAdapter.isFirstPositionInBigCell(selectedCell)) return false;
SNode anchor = selectedCell.getSNode();
if (anchor.getParent() == null) return false;
NodeAndRole nodeAndRole =
new NodePaster(pasteNodes).getActualAnchorNode(anchor, anchor.getRoleInParent(), false);
if (nodeAndRole == null) return false;
EditorCell targetCell = selectedCell.getEditorComponent().findNodeCell(nodeAndRole.myNode);
return targetCell != null
&& ((jetbrains.mps.nodeEditor.cells.EditorCell) targetCell)
.getFirstLeaf(CellConditions.SELECTABLE)
== selectedCell
&& new NodePaster(pasteNodes).canPasteRelative(nodeAndRole.myNode);
}
private boolean processSideDeletes(CellActionType type) {
// TODO: review this logic - it was originally copied from EditorComponentKeyboardHandler
final EditorCell selectedCell = getEditorCell();
if (type == CellActionType.DELETE
&& APICellAdapter.isLastPositionInBigCell(selectedCell)
&& !APICellAdapter.isFirstPositionInBigCell(selectedCell)) {
final EditorCell target;
EditorCell bigCellNextSibling =
CellTraversalUtil.getNextSibling(APICellAdapter.getContainingBigCell(selectedCell));
if (bigCellNextSibling != null) {
target = bigCellNextSibling;
} else {
EditorCell nextSibling =
CellTraversalUtil.getNextSibling(APICellAdapter.getContainingBigCell(selectedCell));
if (nextSibling != null) {
target = nextSibling;
} else {
target =
CellTraversalUtil.getNextLeaf(
selectedCell, jetbrains.mps.openapi.editor.cells.CellConditions.SELECTABLE);
}
}
if (target == null
|| ModelAccess.instance()
.runReadAction(
new Computable<Boolean>() {
@Override
public Boolean compute() {
return jetbrains.mps.util.SNodeOperations.isAncestor(
target.getSNode(), selectedCell.getSNode());
}
})) return false;
return getEditorComponent().getActionHandler().executeAction(target, type);
}
if (type == CellActionType.BACKSPACE
&& APICellAdapter.isFirstPositionInBigCell(selectedCell)
&& !APICellAdapter.isLastPositionInBigCell(selectedCell)) {
final EditorCell target;
EditorCell bigCellPrevSibling =
CellTraversalUtil.getPrevSibling(APICellAdapter.getContainingBigCell(selectedCell));
if (bigCellPrevSibling != null) {
target = bigCellPrevSibling;
} else {
EditorCell prevSibling = CellTraversalUtil.getPrevSibling(selectedCell);
if (prevSibling != null) {
target = prevSibling;
} else {
target =
CellTraversalUtil.getPrevLeaf(
selectedCell, jetbrains.mps.openapi.editor.cells.CellConditions.SELECTABLE);
}
}
if (target == null || ReadOnlyUtil.isCellReadOnly(target)) return false;
/*
Was commented out (again) to let some of our unit-tests be green.
in particular - pressing BackSpace at this situation:
<code>
int a = 1;
--|a;
<code>
where "|" is a position of cursor;
if (ModelAccess.instance().runReadAction(new Computable<Boolean>() {
public Boolean compute() {
return jetbrains.mps.util.SNodeOperations.isAncestor(target.getSNode(), selectedCell.getSNode());
}
})) return false;
*/
return getEditorComponent().getActionHandler().executeAction(target, type);
}
return false;
}