XQuickEvaluateHandler.java example

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/*
 * Copyright 2000-2009 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.xdebugger.impl.evaluate.quick;

import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.SelectionModel;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.xdebugger.XDebugSession;
import com.intellij.xdebugger.XDebuggerManager;
import com.intellij.xdebugger.evaluation.ExpressionInfo;
import com.intellij.xdebugger.evaluation.XDebuggerEvaluator;
import com.intellij.xdebugger.impl.evaluate.quick.common.AbstractValueHint;
import com.intellij.xdebugger.impl.evaluate.quick.common.QuickEvaluateHandler;
import com.intellij.xdebugger.impl.evaluate.quick.common.ValueHintType;
import com.intellij.xdebugger.settings.XDebuggerSettingsManager;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.awt.*;

/**
 * @author nik
 */
public class XQuickEvaluateHandler extends QuickEvaluateHandler {
  private static final Logger LOG = Logger.getInstance("#com.intellij.xdebugger.impl.evaluate.quick.XQuickEvaluateHandler");

  @Override
  public boolean isEnabled(@NotNull final Project project) {
    XDebugSession session = XDebuggerManager.getInstance(project).getCurrentSession();
    return session != null && session.getDebugProcess().getEvaluator() != null;
  }

  @Override
  public AbstractValueHint createValueHint(@NotNull final Project project, @NotNull final Editor editor, @NotNull final Point point, final ValueHintType type) {
    final XDebugSession session = XDebuggerManager.getInstance(project).getCurrentSession();
    if (session == null) {
      return null;
    }

    final XDebuggerEvaluator evaluator = session.getDebugProcess().getEvaluator();
    if (evaluator == null) {
      return null;
    }

    return PsiDocumentManager.getInstance(project).commitAndRunReadAction(new Computable<XValueHint>() {
      @Override
      public XValueHint compute() {
        int offset = AbstractValueHint.calculateOffset(editor, point);
        ExpressionInfo expressionInfo = getExpressionInfo(evaluator, project, type, editor, offset);
        if (expressionInfo == null) {
          return null;
        }

        int textLength = editor.getDocument().getTextLength();
        TextRange range = expressionInfo.getTextRange();
        if (range.getStartOffset() > range.getEndOffset() || range.getStartOffset() < 0 || range.getEndOffset() > textLength) {
          LOG.error("invalid range: " + range + ", text length = " + textLength + ", evaluator: " + evaluator);
          return null;
        }

        return new XValueHint(project, editor, point, type, expressionInfo, evaluator, session);
      }
    });
  }

  @Nullable
  private static ExpressionInfo getExpressionInfo(final XDebuggerEvaluator evaluator,
                                                  final Project project,
                                                  final ValueHintType type,
                                                  final Editor editor,
                                                  final int offset) {
    SelectionModel selectionModel = editor.getSelectionModel();
    int selectionStart = selectionModel.getSelectionStart();
    int selectionEnd = selectionModel.getSelectionEnd();
    if ((type == ValueHintType.MOUSE_CLICK_HINT || type == ValueHintType.MOUSE_ALT_OVER_HINT) &&
        selectionModel.hasSelection() &&
        selectionStart <= offset &&
        offset <= selectionEnd) {
      return new ExpressionInfo(new TextRange(selectionStart, selectionEnd));
    }
    return evaluator.getExpressionInfoAtOffset(project, editor.getDocument(), offset,
                                               type == ValueHintType.MOUSE_CLICK_HINT || type == ValueHintType.MOUSE_ALT_OVER_HINT);
  }

  @Override
  public boolean canShowHint(@NotNull final Project project) {
    return isEnabled(project);
  }

  @Override
  public int getValueLookupDelay(final Project project) {
    return XDebuggerSettingsManager.getInstance().getDataViewSettings().getValueLookupDelay();
  }
}