gistfile1.java

package com.googlecode.intellimars.quicklook;

import com.intellij.codeInsight.hint.ImplementationViewComponent;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.LangDataKeys;
import com.intellij.openapi.actionSystem.PlatformDataKeys;
import com.intellij.openapi.actionSystem.impl.ActionMenuItem;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.popup.ComponentPopupBuilder;
import com.intellij.openapi.ui.popup.JBPopup;
import com.intellij.openapi.ui.popup.JBPopupFactory;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiElement;
import com.intellij.ui.awt.RelativePoint;

public class QuickLookAction extends AnAction {
    Logger logger = Logger.getInstance(QuickLookAction.class.getSimpleName());

    public void actionPerformed(AnActionEvent e) {
        VirtualFile file = e.getData(PlatformDataKeys.VIRTUAL_FILE);
        if (file == null || file.isDirectory()) return;

        Project project = e.getData(PlatformDataKeys.PROJECT);
        PsiElement psiElement = e.getData(LangDataKeys.PSI_ELEMENT);
        logger.debug("psiElement = " + psiElement);
        if (psiElement == null) return;

        ImplementationViewComponent viewComponent = new ImplementationViewComponent(new PsiElement[] { psiElement }, 0);

        JBPopupFactory factory = JBPopupFactory.getInstance();
        ComponentPopupBuilder popupBuilder = factory.createComponentPopupBuilder(viewComponent, viewComponent.getPrefferedFocusableComponent());


        popupBuilder.setProject(project);
        popupBuilder.setResizable(true);
        popupBuilder.setMovable(true);
        popupBuilder.setTitle("HINT");
        JBPopup popup = popupBuilder.createPopup();
        popup.showInBestPositionFor(e.getDataContext());
    }
}

gistfile2.xsl

<idea-plugin version="2">
  <name>Plugin name here</name>
  <description>short description of the plugin</description>
  <version>1.0</version>
  <vendor>YourCompany</vendor>
  <idea-version since-build="8000"/>

  <application-components>
    <!-- Add your application components here -->
  </application-components>

  <project-components>
    <!-- Add your project components here -->
  </project-components>

  <actions>
    <!-- Add your actions here -->
    <action id="intellimars.QuickLookAction" class="com.googlecode.intellimars.quicklook.QuickLookAction" text="quick look">
      <add-to-group group-id="ProjectViewPopupMenu" anchor="after" relative-to-action="OpenInBrowser"/>
      <keyboard-shortcut keymap="$default" first-keystroke="ctrl 1" />
    </action>
  </actions>

  <extensions defaultExtensionNs="com.intellij">
    <!-- Add your extensions here -->
  </extensions>
</idea-plugin>