/**
 * 配置文件
 * Created by huachao on 2016/12/27.
 */
@State(
  name = "amazing-mode",
  storages = {
    @Storage(
      id = "amazing-mode",
      file = "$APP_CONFIG$/amazing-mode_setting.xml"
    )
  }
)
public class GlobalVar implements PersistentStateComponent<GlobalVar.State> {

 public static final class State {
  public boolean IS_ENABLE;
  public boolean IS_RANDOM;
 }

 @Nullable
 @Override
 public State getState() {
  return this.state;
 }

 @Override
 public void loadState(State state) {
  this.state = state;
 }

 public State state = new State();

 public GlobalVar() {

  state.IS_ENABLE = false;
  state.IS_RANDOM = false;
 }

 public static GlobalVar getInstance() {
  return ServiceManager.getService(GlobalVar.class);
 }

}

<extensions defaultExtensionNs="com.intellij">
 <!-- Add your extensions here -->
 <applicationService
   serviceImplementation="com.huachao.plugin.util.GlobalVar"
   serviceInterface="com.huachao.plugin.util.GlobalVar"
 />
</extensions>

private GlobalVar.State state = GlobalVar.getInstance().state;
//state.IS_ENABLE
//state.IS_RANDOM

/**
 * Created by huachao on 2016/12/27.
 */
public class EnableAction extends AnAction {
 private GlobalVar.State state = GlobalVar.getInstance().state;


 @Override
 public void update(AnActionEvent e) {
  Project project = e.getData(PlatformDataKeys.PROJECT);
  Editor editor = e.getData(PlatformDataKeys.EDITOR);
  if (editor == null || project == null) {
   e.getPresentation().setEnabled(false);
  } else {
   JComponent component = editor.getContentComponent();
   if (component == null) {
    e.getPresentation().setEnabled(false);
   } else {
    e.getPresentation().setEnabled(true);
   }
  }
  updateState(e.getPresentation());
 }

 @Override
 public void actionPerformed(AnActionEvent e) {
  Project project = e.getData(PlatformDataKeys.PROJECT);
  Editor editor = e.getData(PlatformDataKeys.EDITOR);
  if (editor == null || project == null) {
   return;
  }
  JComponent component = editor.getContentComponent();
  if (component == null)
   return;
  state.IS_ENABLE = !state.IS_ENABLE;
  updateState(e.getPresentation());

  //只要点击Enable项，就把缓存中所有的文本清理
  CharPanel.getInstance(component).clearAllStr();

  GlobalVar.registerDocumentListener(project, editor, state.IS_ENABLE);
 }


 private void updateState(Presentation presentation) {

  if (state.IS_ENABLE) {
   presentation.setText("Enable");
   presentation.setIcon(AllIcons.General.InspectionsOK);
  } else {
   presentation.setText("Disable");
   presentation.setIcon(AllIcons.Actions.Cancel);
  }
 }


}

CharPanel.getInstance(component).clearAllStr();
GlobalVar.registerDocumentListener(project, editor, state.IS_ENABLE);

private static AmazingDocumentListener amazingDocumentListener = null;

public static void registerDocumentListener(Project project, Editor editor, boolean isFromEnableAction) {
 if (!hasAddListener || isFromEnableAction) {
  hasAddListener = true;
  JComponent component = editor.getContentComponent();
  if (component == null)
   return;
  if (amazingDocumentListener == null) {

   amazingDocumentListener = new AmazingDocumentListener(project);
   Document document = editor.getDocument();
   document.addDocumentListener(amazingDocumentListener);
  }

  Thread thread = new Thread(CharPanel.getInstance(component));
  thread.start();
 }
}

package com.huachao.plugin.util;

import com.huachao.plugin.Entity.CharObj;

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

/**
 * Created by huachao on 2016/12/27.
 */
public class CharPanel implements Runnable {
 private JComponent mComponent;
 private Point mCurPosition;
 private Set<CharObj> charSet = new HashSet<CharObj>();
 private List<CharObj> bufferList = new ArrayList<CharObj>();


 private GlobalVar.State state = GlobalVar.getInstance().state;


 public void setComponent(JComponent component) {
  mComponent = component;
 }


 public void run() {
  while (state.IS_ENABLE) {
   if (GlobalVar.font != null) {
    synchronized (bufferList) {
     charSet.addAll(bufferList);
     bufferList.clear();
    }
    draw();
    int minFontSize = GlobalVar.font.getSize();

    //修改各个Label的属性，使之能以动画形式出现和消失
    Iterator<CharObj> it = charSet.iterator();
    while (it.hasNext()) {
     CharObj obj = it.next();
     if (obj.isAdd()) {//如果是添加到文本框
      if (obj.getSize() <= minFontSize) {//当字体大小到达最小后，使之消失
       mComponent.remove(obj.getLabel());
       it.remove();
      } else {//否则，继续减小
       int size = obj.getSize() - 6 < minFontSize ? minFontSize : (obj.getSize() - 6);
       obj.setSize(size);
      }
     } else {//如果是从文本框中删除
      Point p = obj.getPosition();
      if (p.y <= 0 || obj.getSize() <= 0) {//如果到达最底下，则清理
       mComponent.remove(obj.getLabel());
       it.remove();
      } else {
       p.y = p.y - 10;
       int size = obj.getSize() - 1 < 0 ? 0 : (obj.getSize() - 1);
       obj.setSize(size);
      }
     }
    }

   }
   try {
    if (charSet.isEmpty()) {
     synchronized (charSet) {
      charSet.wait();
     }
    }
    Thread.currentThread().sleep(50);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
 }

 //绘制文本，本质上只是修改各个文本的位置和字体大小
 private void draw() {
  if (mComponent == null)
   return;

  for (CharObj obj : charSet) {
   JLabel label = obj.getLabel();

   Font font = new Font(GlobalVar.font.getName(), GlobalVar.font.getStyle(), obj.getSize());

   label.setFont(font);
   FontMetrics metrics = label.getFontMetrics(label.getFont());
   int textH = metrics.getHeight(); //字符串的高, 只和字体有关
   int textW = metrics.stringWidth(label.getText()); //字符串的宽
   label.setBounds(obj.getPosition().x, obj.getPosition().y - (textH - GlobalVar.minTextHeight), textW, textH);
  }
  mComponent.invalidate();
 }

 public void clearAllStr() {
  synchronized (bufferList) {
   bufferList.clear();
   charSet.clear();

   Iterator<CharObj> setIt = charSet.iterator();
   while (setIt.hasNext()) {
    CharObj obj = setIt.next();
    mComponent.remove(obj.getLabel());
   }

   Iterator<CharObj> bufferIt = bufferList.iterator();
   while (bufferIt.hasNext()) {
    CharObj obj = bufferIt.next();
    mComponent.remove(obj.getLabel());
   } 
  }
 }

 //单例模式，静态内部类
 private static class SingletonHolder {
  //静态初始化器，由JVM来保证线程安全
  private static CharPanel instance = new CharPanel();
 }

 //返回单例对象
 public static CharPanel getInstance(JComponent component) {
  if (component != null) {
   SingletonHolder.instance.mComponent = component;
  }
  return SingletonHolder.instance;
 }

 //由光标监听器回调，由此可动态获取当前光标位置
 public void setPosition(Point position) {
  this.mCurPosition = position;
 }

 /**
  * 将字符串添加到列表中。
  *
  * @isAdd 如果为true表示十新增字符串，否则为被删除字符串
  * @str 字符串
  */
 public void addStrToList(String str, boolean isAdd) {
  if (mComponent != null && mCurPosition != null) {

   CharObj charObj = new CharObj(mCurPosition.y);
   JLabel label = new JLabel(str);
   charObj.setStr(str);
   charObj.setAdd(isAdd);
   charObj.setLabel(label);
   if (isAdd)
    charObj.setSize(60);
   else
    charObj.setSize(GlobalVar.font.getSize());
   charObj.setPosition(mCurPosition);
   if (state.IS_RANDOM) {
    label.setForeground(randomColor());
   } else {
    label.setForeground(GlobalVar.defaultForgroundColor);
   }
   synchronized (bufferList) {
    bufferList.add(charObj);
   }
   if (charSet.isEmpty()) {
    synchronized (charSet) {
     charSet.notify();
    }
   }

   mComponent.add(label);
  }
 }

 //以下用于产生随机颜色
 private static final Color[] COLORS = {Color.GREEN, Color.BLACK, Color.BLUE, Color.ORANGE, Color.YELLOW, Color.RED, Color.CYAN, Color.MAGENTA};

 private Color randomColor() {
  int max = COLORS.length;
  int index = new Random().nextInt(max);
  return COLORS[index];
 }
}