DevTools: Changes Drawer

third_party/WebKit/Source/devtools/front_end/workspace/UISourceCode.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 57 matching lines @@
     /** @type {?string} */
     this._content = null;
     this._forceLoadOnCheckContent = false;
     this._checkingContent = false;
     /** @type {?string} */
     this._lastAcceptedContent = null;
     /** @type {?string} */
     this._workingCopy = null;
     /** @type {?function() : string} */
     this._workingCopyGetter = null;
+    this._mightHaveChanges = false;
   }
 
   /**
    * @return {!Promise<?Workspace.UISourceCodeMetadata>}
    */
   requestMetadata() {
     return this._project.requestMetadata(this);
   }
 
   /**
@@ skipping 223 matching lines @@
     this._requestContentPromise = null;
 
 
     if (!this._history)
       this._history = [];
 
     var lastRevision = this._history.length ? this._history[this._history.length - 1] : null;
     if (!lastRevision || lastRevision._content !== this._content) {
       var revision = new Workspace.Revision(this, this._content, new Date());
       this._history.push(revision);
+      this.mightHaveChanges = true;
     }
 
     this._innerResetWorkingCopy();
     this.dispatchEventToListeners(
         Workspace.UISourceCode.Events.WorkingCopyCommitted, {uiSourceCode: this, content: content});
     this._project.workspace().dispatchEventToListeners(
         Workspace.Workspace.Events.WorkingCopyCommitted, {uiSourceCode: this, content: content});
     if (committedByUser) {
       this._project.workspace().dispatchEventToListeners(
           Workspace.Workspace.Events.WorkingCopyCommittedByUser, {uiSourceCode: this, content: content});
     }
   }
 
+  /**
+   * @return {!Promise<boolean>}
+   */
+  hasChanges() {
+    if (!this.mightHaveChanges)
+      return Promise.resolve(false);
+    return this.requestOriginalContent().then(content => this.mightHaveChanges = content !== this.workingCopy());
+  }
+
   saveAs() {
     Workspace.fileManager.save(this._url, this.workingCopy(), true, callback.bind(this));
     Workspace.fileManager.close(this._url);
 
     /**
      * @param {boolean} accepted
      * @this {Workspace.UISourceCode}
      */
     function callback(accepted) {
       if (accepted)
@@ skipping 91 matching lines @@
 
   /**
   * @param {function(): string } workingCopyGetter
   */
   setWorkingCopyGetter(workingCopyGetter) {
     this._workingCopyGetter = workingCopyGetter;
     this._workingCopyChanged();
   }
 
   _workingCopyChanged() {
+    this.mightHaveChanges = true;
     this._removeAllMessages();
     this.dispatchEventToListeners(Workspace.UISourceCode.Events.WorkingCopyChanged, this);
     this._project.workspace().dispatchEventToListeners(
         Workspace.Workspace.Events.WorkingCopyChanged, {uiSourceCode: this});
   }
 
   removeWorkingCopyGetter() {
     if (!this._workingCopyGetter)
       return;
     this._workingCopy = this._workingCopyGetter();
@@ skipping 465 matching lines @@
 Workspace.UISourceCodeMetadata = class {
   /**
    * @param {?Date} modificationTime
    * @param {?number} contentSize
    */
   constructor(modificationTime, contentSize) {
     this.modificationTime = modificationTime;
     this.contentSize = contentSize;
   }
 };