xml/dom-openapi/src/com/intellij/util/xml/ui/CommitablePanelUserActivityListener.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
  17 package com.intellij.util.xml.ui;
  18
  19 import com.intellij.ui.UserActivityListener;
  20 import com.intellij.util.Alarm;
  21 import com.intellij.openapi.Disposable;
  22 import com.intellij.openapi.components.ServiceManager;
  23 import com.intellij.openapi.project.Project;
  24 import com.intellij.openapi.progress.ProgressManager;
  25 import com.intellij.openapi.progress.ProgressIndicator;
  26
  27 /**
  28  * User: Sergey.Vasiliev
  29  */
  30 public class CommitablePanelUserActivityListener implements UserActivityListener, Disposable {
  31   private final Committable myPanel;
  32   private final Project myProject;
  33   private final Alarm myAlarm = new Alarm();
  34   private boolean myApplying;
  35
  36   public CommitablePanelUserActivityListener(Project project) {
  37     this(null, project);
  38   }
  39
  40   public CommitablePanelUserActivityListener(final Committable panel, Project project) {
  41     myPanel = panel;
  42     myProject = project;
  43   }
  44
  45   final public void stateChanged() {
  46     if (myApplying) return;
  47     cancel();
  48     cancelAllRequests();
  49     myAlarm.addRequest(new Runnable() {
  50       public void run() {
  51         myApplying = true;
  52         cancel();
  53         try {
  54           applyChanges();
  55         }
  56         finally {
  57           myApplying = false;
  58         }
  59       }
  60     }, 717);
  61   }
  62
  63   private static void cancel() {
  64     final ProgressIndicator indicator = ProgressManager.getInstance().getProgressIndicator();
  65     if (indicator != null) {
  66       indicator.cancel();
  67     }
  68   }
  69
  70   protected void applyChanges() {
  71     if (myPanel != null) {
  72       commit(myPanel);
  73     }
  74   }
  75
  76   protected final void commit(final Committable panel) {
  77     ServiceManager.getService(getProject(), CommittableUtil.class).commit(panel);
  78   }
  79
  80   protected final Project getProject() {
  81     return myProject;
  82   }
  83
  84   public final boolean isWaiting() {
  85     return myAlarm.getActiveRequestCount() > 0;
  86   }
  87
  88   public final void cancelAllRequests() {
  89     myAlarm.cancelAllRequests();
  90   }
  91
  92   public void dispose() {
  93     cancelAllRequests();
  94   }
  95 }