/*
* 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.caret;
import jetbrains.mps.nodeEditor.EditorComponent;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import jetbrains.mps.openapi.editor.cells.optional.WithCaret;
import org.jetbrains.annotations.NotNull;
import java.util.concurrent.ScheduledFuture;
/**
* User: shatalin
* Date: 29/07/16
*/
public abstract class CaretManager {
protected static CaretManager ourInstance;
private volatile EditorComponent myActiveEditor;
private ScheduledFuture<?> mySchedulerHandle;
public static CaretManager getInstance() {
if (ourInstance == null) {
// Default, not blinking caret manager
ourInstance = new CaretManager() {
@Override
protected ScheduledFuture<?> start() {
return null;
}
};
}
return ourInstance;
}
/**
* should be called in EDT
*
* @param editor
*/
public void unsetActiveEditor(@NotNull EditorComponent editor) {
if (editor != myActiveEditor) {
return;
}
doSetActiveEditor(null);
}
/**
* should be called in EDT
*
* @param editor
*/
public void setActiveEditor(@NotNull EditorComponent editor) {
doSetActiveEditor(editor);
}
private void doSetActiveEditor(EditorComponent editor) {
setCaretVisible(false);
myActiveEditor = editor;
setCaretVisible(true);
if (myActiveEditor != null && mySchedulerHandle == null) {
mySchedulerHandle = start();
}
if (myActiveEditor == null && mySchedulerHandle != null) {
mySchedulerHandle.cancel(false);
mySchedulerHandle = null;
}
}
protected void restart() {
if (mySchedulerHandle == null) {
return;
}
mySchedulerHandle.cancel(false);
mySchedulerHandle = start();
}
protected abstract ScheduledFuture<?> start();
private void setCaretVisible(boolean visible) {
if (getActiveEditor() == null) {
return;
}
EditorCell selectedCell = getActiveEditor().getDeepestSelectedCell();
if (selectedCell instanceof WithCaret) {
((WithCaret) selectedCell).setCaretVisible(visible);
}
}
private EditorComponent getActiveEditor() {
return myActiveEditor;
}
/**
* should be called in EDT
*/
protected class Blink implements Runnable {
public Blink() {
}
@Override
public void run() {
if (getActiveEditor() == null) {
return;
}
EditorCell selectedCell = getActiveEditor().getDeepestSelectedCell();
if (selectedCell instanceof WithCaret) {
((WithCaret) selectedCell).switchCaretVisible();
}
}
}
}