platform/lang-impl/src/com/intellij/codeInsight/hint/PrevNextParameterHandler.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   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
  17 package com.intellij.codeInsight.hint;
  18
  19 import com.intellij.openapi.actionSystem.DataContext;
  20 import com.intellij.openapi.actionSystem.PlatformDataKeys;
  21 import com.intellij.openapi.editor.Editor;
  22 import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
  23 import com.intellij.openapi.project.Project;
  24 import com.intellij.psi.PsiDocumentManager;
  25 import com.intellij.psi.PsiElement;
  26 import com.intellij.psi.PsiFile;
  27
  28 /**
  29  * @author ven
  30  */
  31 public class PrevNextParameterHandler extends EditorActionHandler {
  32   public PrevNextParameterHandler(boolean isNextParameterHandler) {
  33     myIsNextParameterHandler = isNextParameterHandler;
  34   }
  35
  36   private final boolean myIsNextParameterHandler;
  37
  38   private static PsiElement getExpressionList(Editor editor, Project project) {
  39     int offset = editor.getCaretModel().getOffset();
  40     PsiFile file = PsiDocumentManager.getInstance(project).getPsiFile(editor.getDocument());
  41     if (file == null) return null;
  42     return ParameterInfoController.findArgumentList(file, offset, -1);
  43   }
  44
  45   public boolean isEnabled(Editor editor, DataContext dataContext) {
  46     Project project = PlatformDataKeys.PROJECT.getData(dataContext);
  47     if (project == null) return false;
  48     PsiDocumentManager.getInstance(project).commitAllDocuments();
  49
  50     PsiElement exprList = getExpressionList(editor, project);
  51     return exprList != null && ParameterInfoController.isAlreadyShown(editor, exprList.getTextRange().getStartOffset());
  52   }
  53
  54   public void execute(Editor editor, DataContext dataContext) {
  55     Project project = PlatformDataKeys.PROJECT.getData(dataContext);
  56     PsiElement exprList = getExpressionList(editor, project);
  57     int listOffset = exprList.getTextRange().getStartOffset();
  58     if (myIsNextParameterHandler) {
  59       ParameterInfoController.nextParameter(editor, listOffset);
  60     }
  61     else {
  62       ParameterInfoController.prevParameter(editor, listOffset);
  63     }
  64   }
  65 }