plugins/groovy/src/org/jetbrains/plugins/groovy/actions/GrGetPsiTypeAction.java

/*
 * Copyright 2000-2014 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 org.jetbrains.plugins.groovy.actions;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.MessageType;
import com.intellij.openapi.ui.popup.Balloon;
import com.intellij.openapi.ui.popup.JBPopupFactory;
import com.intellij.openapi.util.Pass;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.wm.WindowManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiType;
import com.intellij.refactoring.IntroduceTargetChooser;
import com.intellij.ui.awt.RelativePoint;
import com.intellij.util.Function;
import org.jetbrains.plugins.groovy.editor.HandlerUtils;
import org.jetbrains.plugins.groovy.lang.psi.GroovyFile;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.refactoring.introduce.GrIntroduceHandlerBase;

import javax.swing.*;
import java.awt.*;
import java.util.List;

/**
 * @author Maxim.Medvedev
 */
public class GrGetPsiTypeAction extends AnAction implements DumbAware {
  @Override
  public void actionPerformed(AnActionEvent e) {
    final Editor editor = CommonDataKeys.EDITOR.getData(e.getDataContext());
    if (editor == null) return;

    final PsiFile psiFile = HandlerUtils.getPsiFile(editor, e.getDataContext());
    if (!(psiFile instanceof GroovyFile)) return;

    int offset = editor.getCaretModel().getOffset();

    List<GrExpression> expressions = GrIntroduceHandlerBase.collectExpressions(psiFile, editor, offset, true);
    if (expressions.isEmpty()) return;
    if (expressions.size() == 1) {
      passInner(expressions.get(0));
    }
    else {
      IntroduceTargetChooser.showChooser(editor, expressions, new Pass<GrExpression>() {
        @Override
        public void pass(GrExpression grExpression) {
          passInner(grExpression);
        }
      }, new Function<GrExpression, String>() {
        @Override
        public String fun(GrExpression grExpression) {
          return grExpression.getText();
        }
      });
    }
  }

  /**
   * Shows an information balloon in a reasonable place at the top right of the window.
   *
   * @param project     our project
   * @param message     the text, HTML markup allowed
   * @param messageType message type, changes the icon and the background.
   */
  // TODO: move to a better place
  public static void showBalloon(Project project, String message, MessageType messageType) {
    // ripped from com.intellij.openapi.vcs.changes.ui.ChangesViewBalloonProblemNotifier
    final JFrame frame = WindowManager.getInstance().getFrame(project.isDefault() ? null : project);
    if (frame == null) return;
    final JComponent component = frame.getRootPane();
    if (component == null) return;
    final Rectangle rect = component.getVisibleRect();
    final Point p = new Point(rect.x + rect.width - 10, rect.y + 10);
    final RelativePoint point = new RelativePoint(component, p);

    JBPopupFactory.getInstance().createHtmlTextBalloonBuilder(message, messageType.getDefaultIcon(), messageType.getPopupBackground(), null)
      .setShowCallout(false).setCloseButtonEnabled(true)
      .createBalloon().show(point, Balloon.Position.atLeft);
  }

  public static void passInner(GrExpression expression) {
    PsiType type = expression.getType();
    String text = type == null ? "type is null" : type.getCanonicalText();

    showBalloon(expression.getProject(), StringUtil.escapeXml(text), MessageType.INFO);
  }

  @Override
  public void update(AnActionEvent e) {
    Editor editor = CommonDataKeys.EDITOR.getData(e.getDataContext());
    if (editor != null) {
      PsiFile psiFile = HandlerUtils.getPsiFile(editor, e.getDataContext());
      if (psiFile instanceof GroovyFile) {
        e.getPresentation().setEnabled(true);
        return;
      }
    }
    e.getPresentation().setEnabled(false);
  }
}