java/java-impl/src/com/intellij/codeInsight/folding/impl/CollapseBlockHandler.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 package com.intellij.codeInsight.folding.impl;
  17
  18 import com.intellij.codeInsight.CodeInsightActionHandler;
  19 import com.intellij.openapi.diagnostic.Logger;
  20 import com.intellij.openapi.editor.Editor;
  21 import com.intellij.openapi.editor.FoldRegion;
  22 import com.intellij.openapi.editor.ex.FoldingModelEx;
  23 import com.intellij.openapi.project.Project;
  24 import com.intellij.psi.*;
  25 import com.intellij.psi.util.PsiTreeUtil;
  26 import org.jetbrains.annotations.NotNull;
  27
  28 /**
  29  * @author ven
  30  */
  31 public class CollapseBlockHandler implements CodeInsightActionHandler {
  32   public static final String ourPlaceHolderText = "{...}";
  33   private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.folding.impl.CollapseBlockHandler");
  34
  35   public void invoke(@NotNull final Project project, @NotNull final Editor editor, @NotNull final PsiFile file) {
  36     editor.getFoldingModel().runBatchFoldingOperation(new Runnable() {
  37       public void run() {
  38         final EditorFoldingInfo info = EditorFoldingInfo.get(editor);
  39         FoldingModelEx model = (FoldingModelEx) editor.getFoldingModel();
  40         PsiElement element = file.findElementAt(editor.getCaretModel().getOffset() - 1);
  41         if (!(element instanceof PsiJavaToken) || ((PsiJavaToken) element).getTokenType() != JavaTokenType.RBRACE) {
  42           element = file.findElementAt(editor.getCaretModel().getOffset());
  43         }
  44         if (element == null) return;
  45         PsiCodeBlock block = PsiTreeUtil.getParentOfType(element, PsiCodeBlock.class);
  46         FoldRegion previous = null;
  47         FoldRegion myPrevious = null;
  48         while (block != null) {
  49           int start = block.getTextRange().getStartOffset();
  50           int end = block.getTextRange().getEndOffset();
  51           FoldRegion existing = FoldingUtil.findFoldRegion(editor, start, end);
  52           if (existing != null) {
  53             previous = existing;
  54             if (info.getPsiElement(existing) == null) myPrevious = existing;
  55             block = PsiTreeUtil.getParentOfType(block, PsiCodeBlock.class);
  56             continue;
  57           }
  58           if (!model.intersectsRegion(start, end)) {
  59             FoldRegion region = model.addFoldRegion(start, end, ourPlaceHolderText);
  60             LOG.assertTrue(region != null);
  61             region.setExpanded(false);
  62             if (myPrevious != null && info.getPsiElement(region) == null) {
  63               info.removeRegion(myPrevious);
  64               model.removeFoldRegion(myPrevious);
  65             }
  66             int offset = block.getTextRange().getEndOffset() < editor.getCaretModel().getOffset() ?
  67                 start : end;
  68             editor.getCaretModel().moveToOffset(offset);
  69             return;
  70           } else break;
  71         }
  72         if (previous != null) {
  73           previous.setExpanded(false);
  74           if (myPrevious != null) {
  75             info.removeRegion(myPrevious);
  76             model.removeFoldRegion(myPrevious);
  77           }
  78           editor.getCaretModel().moveToOffset(previous.getEndOffset());
  79         }
  80       }
  81     });
  82   }
  83
  84   public boolean startInWriteAction() {
  85     return true;
  86   }
  87 }