ShortcutTextField.java

/*
 * Copyright 2000-2016 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 com.intellij.openapi.keymap.impl.ui;

import com.intellij.openapi.keymap.KeymapUtil;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.ui.KeyStrokeAdapter;

import javax.swing.*;
import javax.swing.text.DefaultCaret;
import java.awt.*;
import java.awt.event.KeyEvent;

public final class ShortcutTextField extends JTextField {
  private KeyStroke myKeyStroke;

  ShortcutTextField() {
    enableEvents(AWTEvent.KEY_EVENT_MASK);
    setFocusTraversalKeysEnabled(false);
    setCaret(new DefaultCaret() {
      @Override
      public boolean isVisible() {
        return false;
      }
    });
  }

  private static boolean absolutelyUnknownKey (KeyEvent e) {
    return e.getKeyCode() == 0
           && e.getExtendedKeyCode() == 0
           && e.getKeyChar() == KeyEvent.CHAR_UNDEFINED
           && e.getKeyLocation() == KeyEvent.KEY_LOCATION_UNKNOWN
           && e.getExtendedKeyCode() == 0;
  }

  protected void processKeyEvent(KeyEvent e) {
    if (e.getID() == KeyEvent.KEY_PRESSED) {
      int keyCode = e.getKeyCode();

      if (keyCode == KeyEvent.VK_SHIFT ||
          keyCode == KeyEvent.VK_ALT ||
          keyCode == KeyEvent.VK_CONTROL ||
          keyCode == KeyEvent.VK_ALT_GRAPH ||
          keyCode == KeyEvent.VK_META ||
          absolutelyUnknownKey(e)) {
        return;
      }
      setKeyStroke(KeyStrokeAdapter.getDefaultKeyStroke(e));
    }
  }

  void setKeyStroke(KeyStroke keyStroke) {
    KeyStroke old = myKeyStroke;
    if (old != null || keyStroke != null) {
      myKeyStroke = keyStroke;
      super.setText(KeymapUtil.getKeystrokeText(keyStroke));
      setCaretPosition(0);
      firePropertyChange("keyStroke", old, keyStroke);
    }
  }

  KeyStroke getKeyStroke() {
    return myKeyStroke;
  }

  @Override
  public void enableInputMethods(boolean enable) {
    super.enableInputMethods(enable && Registry.is("ide.settings.keymap.input.method.enabled"));
  }

  @Override
  public void setText(String text) {
    super.setText(text);
    setCaretPosition(0);
    if (text == null || text.isEmpty()) {
      myKeyStroke = null;
      firePropertyChange("keyStroke", null, null);
    }
  }
}