/*
* Copyright 2003-2016 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.nodeEditor.selection.SingularSelectionUtil;
import jetbrains.mps.openapi.editor.EditorComponent;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import jetbrains.mps.openapi.editor.selection.Selection;
import jetbrains.mps.openapi.editor.selection.SelectionListener;
import jetbrains.mps.openapi.editor.selection.SelectionManager;
import jetbrains.mps.openapi.editor.update.Updater;
import jetbrains.mps.openapi.editor.update.UpdaterListener;
import jetbrains.mps.openapi.editor.update.UpdaterListenerAdapter;
/**
* Triggers context assistant updates by calling {@link EditorContextAssistants#hideMenu()} and
* {@link EditorContextAssistants#update()} as needed.
*/
class EditorContextAssistantsController {
private static final long UPDATE_DELAY = 1000L;
private final EditorContextAssistants myEditorContextAssistants;
private final SelectionManager mySelectionManager;
private final Updater myUpdater;
private final ScheduleUpdateListener myScheduleUpdateListener = new ScheduleUpdateListener();
private ScheduleUpdateDelayedRunnable myScheduleUpdateDelayedRunnable;
EditorContextAssistantsController(EditorContextAssistants editorContextAssistants, SelectionManager selectionManager, Updater updater) {
myEditorContextAssistants = editorContextAssistants;
mySelectionManager = selectionManager;
myUpdater = updater;
}
boolean isUpdating() {
return myScheduleUpdateDelayedRunnable != null;
}
void startUpdating() {
myScheduleUpdateDelayedRunnable = new ScheduleUpdateDelayedRunnable(myEditorContextAssistants);
mySelectionManager.addSelectionListener(myScheduleUpdateListener);
myUpdater.addListener(myScheduleUpdateListener);
scheduleUpdate();
}
void stopUpdating() {
myScheduleUpdateDelayedRunnable.dispose();
myScheduleUpdateDelayedRunnable = null;
myUpdater.removeListener(myScheduleUpdateListener);
mySelectionManager.removeSelectionListener(myScheduleUpdateListener);
}
void scheduleUpdate() {
if (isUpdating()) {
myScheduleUpdateDelayedRunnable.scheduleRun(UPDATE_DELAY);
}
}
private class ScheduleUpdateListener extends UpdaterListenerAdapter implements SelectionListener, UpdaterListener {
@Override
public void selectionChanged(EditorComponent editorComponent, Selection oldSelection, Selection newSelection) {
EditorCell oldCell = SingularSelectionUtil.getSingleSelectedCell(oldSelection);
EditorCell newCell = SingularSelectionUtil.getSingleSelectedCell(newSelection);
// Skip uninteresting changes - either within a single cell or from multiple cells to multiple cells.
if (oldCell == newCell) {
return;
}
scheduleUpdate();
}
@Override
public void editorUpdated(EditorComponent editorComponent) {
scheduleUpdate();
}
@Override
public void cellSynchronizedWithModel(EditorCell cell) {
scheduleUpdate();
}
}
private static class ScheduleUpdateDelayedRunnable extends DelayedRunnable {
private EditorContextAssistants myEditorContextAssistants;
ScheduleUpdateDelayedRunnable(EditorContextAssistants editorContextAssistants) {
myEditorContextAssistants = editorContextAssistants;
}
@Override
protected void runImmediately() {
myEditorContextAssistants.hideMenu();
}
@Override
protected void runEventually() {
myEditorContextAssistants.update();
}
}
}