/*
* Copyright 2003-2015 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.assist;
import jetbrains.mps.lang.editor.menus.transformation.DefaultTransformationMenuLookup;
import jetbrains.mps.nodeEditor.menus.MenuUtil;
import jetbrains.mps.nodeEditor.selection.SingularSelectionUtil;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import jetbrains.mps.openapi.editor.menus.transformation.TransformationMenuItem;
import jetbrains.mps.openapi.editor.menus.transformation.TransformationMenuLookup;
import jetbrains.mps.openapi.editor.selection.Selection;
import jetbrains.mps.smodel.language.LanguageRegistry;
import jetbrains.mps.util.Pair;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.language.SConcept;
import java.util.Collections;
import java.util.List;
/**
* Attempts to look up a transformation menu by traversing cell hierarchy upwards from the single currently selected cell. If any cell has a menu defined, it is
* used. For any big cell without a defined menu, the node's concept (and superconcepts) are checked for the presence of a default
* menu. In case when no cell or more than one cell is selected, returns an empty list of items.
*/
public class SelectionMenuProviderByCellAndConcept implements SelectionMenuProvider {
private String myMenuLocation;
public SelectionMenuProviderByCellAndConcept(String menuLocation) {
myMenuLocation = menuLocation;
}
@NotNull
@Override
public List<TransformationMenuItem> getMenuItems(@NotNull Selection selection) {
EditorCell selectedCell = SingularSelectionUtil.getSingleSelectedCell(selection);
if (selectedCell == null) return Collections.emptyList();
final Pair<TransformationMenuLookup, EditorCell> menuLookupAndCell = getMenuLookupAndCell(selectedCell);
if (menuLookupAndCell == null) return Collections.emptyList();
EditorCell editorCell = menuLookupAndCell.o2;
if (editorCell == null || editorCell.getSNode() == null) {
return Collections.emptyList();
}
return MenuUtil.createMenu(menuLookupAndCell.o1, myMenuLocation, editorCell);
}
@Nullable
private Pair<TransformationMenuLookup, EditorCell> getMenuLookupAndCell(EditorCell selectedCell) {
EditorCell cell = selectedCell;
while (cell != null) {
TransformationMenuLookup key = cell.getTransformationMenuLookup();
if (key != null && MenuUtil.isMenuApplicableToLocation(key, myMenuLocation, cell.getSNode())) {
return new Pair<>(key, cell);
}
if (cell.isBig()) {
SConcept concept = cell.getSNode().getConcept();
DefaultTransformationMenuLookup menuLookup = new DefaultTransformationMenuLookup(LanguageRegistry.getInstance(cell.getContext().getRepository()), concept);
if (MenuUtil.isMenuApplicableToLocation(menuLookup, myMenuLocation, cell.getSNode())) {
return new Pair<>(menuLookup, cell);
} else {
return null;
}
}
cell = cell.getParent();
}
return null;
}
}