/*
* 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;
import org.jetbrains.annotations.NotNull;
import java.awt.Component;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
/**
* This class used to track focused state of particular editor component.
* We do not use {@link Component#isFocusOwner()} method because of the
* delayed focus event dispatching in AWT/IDEA. This component used to
* store "request focus" events in order to already use modified component
* focus state in other places like:
* - {@link jetbrains.mps.ide.editor.BaseNodeEditor#loadState(jetbrains.mps.openapi.editor.EditorState)}
* - {@link com.intellij.openapi.command.impl.UndoRedo#restore(com.intellij.openapi.command.impl.EditorAndState)}
* <p>
* Created by shatalin on 20/07/16.
*/
public class EditorComponentFocusTracker {
@NotNull
private final EditorComponent myEditorComponent;
private boolean myEffectiveFocusState;
private FocusListener myFocusListener;
protected EditorComponentFocusTracker(@NotNull EditorComponent editorComponent) {
myEditorComponent = editorComponent;
installFocusListener();
}
/**
* This method may be called to say that we are asking AWT to focus/un-focus
* current component, so this component will be focused/unfocused later, but
* we should remember new focus state (effective focus state) for it and use
* this state in all subsequent calls to save/restore editor states.
*
* @param isFocused boolean future focused state for this component
*/
public void setEffectiveFocusState(boolean isFocused) {
myEffectiveFocusState = isFocused;
}
public boolean getEffectiveFocusState() {
return myEffectiveFocusState;
}
public void dispose() {
unInstallFocusListener();
}
private void installFocusListener() {
myEditorComponent.addFocusListener(myFocusListener = new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
myEffectiveFocusState = true;
}
@Override
public void focusLost(FocusEvent e) {
myEffectiveFocusState = false;
}
});
}
private void unInstallFocusListener() {
myEditorComponent.removeFocusListener(myFocusListener);
myFocusListener = null;
}
}