optimize save button's status

frontend/src/components/file-view/file-toolbar.js

@@ -11,6 +11,8 @@ const propTypes = {
   isLocked: PropTypes.bool.isRequired,
   lockedByMe: PropTypes.bool.isRequired,
   onSaveChangedContent: PropTypes.func.isRequired,
+  isSaving: PropTypes.bool.isRequired,
+  isContentChangedButNotSaved: PropTypes.bool.isRequired,
   toggleLockFile: PropTypes.func.isRequired,
   toggleCommentPanel: PropTypes.func.isRequired
 };
@@ -95,17 +97,24 @@ class FileToolbar extends React.Component {
             />
           )}
           {(canEditFile && !err) && 
-          (<IconButton 
-            text={gettext('Save')} 
-            id={'saveButton'} 
-            icon={'fa fa-save'}  
-            // button imported in this file does not have functionalities of 
-            // disabled, isActive as button imported in markdowneditor has
-            //disabled={isContentChanged} 
-            //isActive={!isContentChanged}
-            onClick={this.props.onSaveChangedContent} 
-          />
-          )}
+            ( this.props.isSaving ? 
+              <button type={'button'} className={'btn btn-icon btn-secondary btn-active'}>
+                <i className={'fa fa-spin fa-spinner'}/></button> :
+              (
+                this.props.isContentChangedButNotSaved ?
+                  <IconButton
+                    text={gettext('Save')}
+                    id={'saveButton'}
+                    icon={'fa fa-save'}
+                    // button imported in this file does not have functionalities of
+                    // isActive as button imported in markdowneditor has
+                    //isActive={!isContentChanged}
+                    onClick={this.props.onSaveChangedContent}
+                  /> :
+                  <button type={'button'} className={'btn btn-icon btn-secondary btn-active'} disabled>
+                    <i className={'fa fa-save'}/></button>
+              )
+            )}
           {canDownloadFile && (
             <IconButton
               id="download-file"

frontend/src/components/file-view/file-view.js

@@ -11,7 +11,9 @@ import '../../css/file-view.css';
 
 const propTypes = {
   onSaveChangedContent: PropTypes.func.isRequired,
-  content: PropTypes.object.isRequired
+  content: PropTypes.object.isRequired,
+  isSaving: PropTypes.bool.isRequired,
+  isContentChangedButNotSaved: PropTypes.bool.isRequired,
 };
 
 const { isStarred, isLocked, lockedByMe,
@@ -84,6 +86,8 @@ class FileView extends React.Component {
             isLocked={this.state.isLocked}
             lockedByMe={this.state.lockedByMe}
             onSaveChangedContent={this.props.onSaveChangedContent}
+            isSaving={this.props.isSaving}
+            isContentChangedButNotSaved={this.props.isContentChangedButNotSaved}
             toggleLockFile={this.toggleLockFile}
             toggleCommentPanel={this.toggleCommentPanel}
           />