/*
* Copyright 2003-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrains.mps.nodeEditor.updater;
import jetbrains.mps.nodeEditor.EditorComponent;
import jetbrains.mps.nodeEditor.cells.CellFinderUtil;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.model.SNode;
/**
* User: shatalin
* Date: 09/09/14
*/
class ChildRemovedSelectionHandler extends ModelEventsSelectionHandler {
private final SNode myParent;
private final String myChildRole;
private int myChildIndex;
ChildRemovedSelectionHandler(@NotNull SNode parent, @NotNull String childRole, int childIndex) {
myParent = parent;
myChildRole = childRole;
myChildIndex = childIndex;
}
@Override
void setEditorSelection(EditorComponent editorComponent, SNode lastSelectedNode) {
if (lastSelectedNode != null && lastSelectedNode.getModel() != null) {
super.setEditorSelection(editorComponent, lastSelectedNode);
return;
}
doSetSelection(editorComponent);
}
private void doSetSelection(EditorComponent editorComponent) {
SNode siblingToSelect = null;
boolean isNextSibling = false;
int index = 0;
for (SNode nextChild : myParent.getChildren()) {
if (myChildRole.equals(nextChild.getRoleInParent())) {
siblingToSelect = nextChild;
if (index >= myChildIndex) {
isNextSibling = true;
break;
}
}
index++;
}
if (siblingToSelect != null && selectNode(siblingToSelect, isNextSibling, editorComponent)) {
return;
}
selectNullCell(editorComponent);
}
private boolean selectNode(SNode node, boolean startPosition, EditorComponent editorComponent) {
EditorCell cell = editorComponent.findNodeCell(node);
if (cell == null) {
return false;
}
EditorCell selectableLeaf = startPosition ? CellFinderUtil.findFirstSelectableLeaf(cell, true) : CellFinderUtil.findLastSelectableLeaf(cell, true);
if (selectableLeaf == null) {
return false;
}
editorComponent.changeSelection(selectableLeaf);
if (startPosition) {
selectableLeaf.home();
} else {
selectableLeaf.end();
}
return true;
}
private void selectNullCell(EditorComponent editorComponent) {
EditorCell nullCell = editorComponent.findNodeCellWithRole(myParent, myChildRole);
if (nullCell != null) {
editorComponent.changeSelectionWRTFocusPolicy(nullCell);
return;
}
EditorCell cell = editorComponent.findNodeCell(myParent);
if (cell != null) {
EditorCell lastLeaf = CellFinderUtil.findLastSelectableLeaf(cell, true);
if (lastLeaf != null) {
editorComponent.changeSelection(lastLeaf);
lastLeaf.end();
}
}
}
}