/*
* Copyright 2000-2015 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 com.intellij.diff.tools.util;
import com.intellij.ide.IdeEventQueue;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.util.Disposer;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
public class KeyboardModifierListener {
private boolean myShiftPressed;
private boolean myCtrlPressed;
private boolean myAltPressed;
@Nullable private Window myWindow;
private final WindowFocusListener myWindowFocusListener = new WindowFocusListener() {
@Override
public void windowGainedFocus(WindowEvent e) {
resetState();
}
@Override
public void windowLostFocus(WindowEvent e) {
resetState();
}
};
public void init(@NotNull JComponent component, @NotNull Disposable disposable) {
assert myWindow == null;
Disposer.register(disposable, new Disposable() {
@Override
public void dispose() {
destroy();
}
});
// we can use KeyListener on Editors, but Ctrl+Click will not work with focus in other place.
// ex: commit dialog with focus in commit message
IdeEventQueue.getInstance().addPostprocessor(new IdeEventQueue.EventDispatcher() {
@Override
public boolean dispatch(AWTEvent e) {
if (e instanceof KeyEvent) {
onKeyEvent((KeyEvent)e);
}
return false;
}
}, disposable);
myWindow = UIUtil.getWindow(component);
if (myWindow != null) {
myWindow.addWindowFocusListener(myWindowFocusListener);
}
}
public void destroy() {
if (myWindow != null) {
myWindow.removeWindowFocusListener(myWindowFocusListener);
myWindow = null;
}
}
private void onKeyEvent(KeyEvent e) {
final int keyCode = e.getKeyCode();
if (keyCode == KeyEvent.VK_SHIFT) {
myShiftPressed = e.getID() == KeyEvent.KEY_PRESSED;
onModifiersChanged();
}
if (keyCode == KeyEvent.VK_CONTROL) {
myCtrlPressed = e.getID() == KeyEvent.KEY_PRESSED;
onModifiersChanged();
}
if (keyCode == KeyEvent.VK_ALT) {
myAltPressed = e.getID() == KeyEvent.KEY_PRESSED;
onModifiersChanged();
}
}
private void resetState() {
myShiftPressed = false;
myAltPressed = false;
myCtrlPressed = false;
onModifiersChanged();
}
public boolean isShiftPressed() {
return myShiftPressed;
}
public boolean isCtrlPressed() {
return myCtrlPressed;
}
public boolean isAltPressed() {
return myAltPressed;
}
public void onModifiersChanged() {
}
}