plugins/IntelliLang/src/org/intellij/plugins/intelliLang/util/ShiftTabAction.java

   1 /*
   2  * Copyright 2006 Sascha Weinreuter
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.intellij.plugins.intelliLang.util;
  17
  18 import com.intellij.openapi.actionSystem.AnAction;
  19 import com.intellij.openapi.actionSystem.AnActionEvent;
  20 import com.intellij.openapi.actionSystem.CustomShortcutSet;
  21 import com.intellij.ui.EditorTextField;
  22
  23 import javax.swing.*;
  24 import java.awt.*;
  25 import java.awt.event.InputEvent;
  26 import java.awt.event.KeyEvent;
  27
  28 /**
  29  * Provides Shift-Tab support in EditorTextFields which otherwise don't support this keystroke to
  30  * move the input focus to the previous component.
  31  */
  32 @SuppressWarnings({"ComponentNotRegistered"})
  33 public class ShiftTabAction extends AnAction {
  34   private static final CustomShortcutSet SHIFT_TAB;
  35
  36   static {
  37     final KeyStroke keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_TAB, InputEvent.SHIFT_MASK);
  38     SHIFT_TAB = new CustomShortcutSet(keyStroke);
  39   }
  40
  41   private final EditorTextField myEditor;
  42
  43   private ShiftTabAction(EditorTextField editor) {
  44     super("Shift-Tab");
  45     myEditor = editor;
  46   }
  47
  48   public void actionPerformed(AnActionEvent event) {
  49     Container container = myEditor.getParent();
  50     while (container != null && container.getFocusTraversalPolicy() == null) {
  51       container = container.getParent();
  52     }
  53     if (container != null) {
  54       final FocusTraversalPolicy ftp = container.getFocusTraversalPolicy();
  55       if (ftp != null) {
  56         final Component prev = ftp.getComponentBefore(container, myEditor);
  57         if (prev != null) {
  58           prev.requestFocus();
  59         }
  60       }
  61     }
  62   }
  63
  64   /**
  65    * Call this method to enable Sift-Tab support for the supplied EditorTextField.
  66    */
  67   public static void attachTo(EditorTextField textField) {
  68     // TODO following code seems not needed due to textField.pleaseHandleShiftTab()
  69     new ShiftTabAction(textField).registerCustomShortcutSet(SHIFT_TAB, textField);
  70   }
  71 }