Print Preview: change getPreview to cr.sendWithPromise

chrome/browser/resources/print_preview/previewarea/preview_area.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.exportPath('print_preview');
 
 /**
  * Enumeration of IDs shown in the preview area.
  * @enum {string}
  * @private
@@ skipping 174 matching lines @@
     // Dispatched when the document preview is complete.
     PREVIEW_GENERATION_DONE:
         'print_preview.PreviewArea.PREVIEW_GENERATION_DONE',
 
     // Dispatched when the document preview failed to be generated.
     PREVIEW_GENERATION_FAIL:
         'print_preview.PreviewArea.PREVIEW_GENERATION_FAIL',
 
     // Dispatched when a new document preview is being generated.
     PREVIEW_GENERATION_IN_PROGRESS:
-        'print_preview.PreviewArea.PREVIEW_GENERATION_IN_PROGRESS'
+        'print_preview.PreviewArea.PREVIEW_GENERATION_IN_PROGRESS',
+
+    // Dispatched when invalid printer settings are detected.
+    SETTINGS_INVALID: 'print_preview.PreviewArea.SETTINGS_INVALID'
   };
 
   /**
    * CSS classes used by the preview area.
    * @enum {string}
    * @private
    */
   PreviewArea.Classes_ = {
     OUT_OF_PROCESS_COMPATIBILITY_OBJECT:
         'preview-area-compatibility-object-out-of-process',
@@ skipping 138 matching lines @@
         this.tracker.add(
             this.previewGenerator_,
             print_preview.PreviewGenerator.EventType.PREVIEW_START,
             this.onPreviewStart_.bind(this));
         this.tracker.add(
             this.previewGenerator_,
             print_preview.PreviewGenerator.EventType.PAGE_READY,
             this.onPagePreviewReady_.bind(this));
         this.tracker.add(
             this.previewGenerator_,
-            print_preview.PreviewGenerator.EventType.FAIL,
-            this.onPreviewGenerationFail_.bind(this));
-        this.tracker.add(
-            this.previewGenerator_,
             print_preview.PreviewGenerator.EventType.DOCUMENT_READY,
             this.onDocumentReady_.bind(this));
       } else {
         this.showCustomMessage(loadTimeData.getString('noPlugin'));
       }
     },
 
     /** @override */
     exitDocument: function() {
       print_preview.Component.prototype.exitDocument.call(this);
@@ skipping 148 matching lines @@
       setIsVisible(openSystemDialogThrobber, true);
       cr.dispatchSimpleEvent(
           this, PreviewArea.EventType.OPEN_SYSTEM_DIALOG_CLICK);
     },
 
     /**
      * Called when the print ticket changes. Updates the preview.
      * @private
      */
     onTicketChange_: function() {
-      if (this.previewGenerator_ && this.previewGenerator_.requestPreview()) {
-        cr.dispatchSimpleEvent(
-            this, PreviewArea.EventType.PREVIEW_GENERATION_IN_PROGRESS);
-        if (this.loadingTimeout_ == null) {
-          this.loadingTimeout_ = setTimeout(
-              this.showMessage_.bind(
-                  this, print_preview.PreviewAreaMessageId_.LOADING),
-              PreviewArea.LOADING_TIMEOUT_);
-        }
-      } else {
+      var requestPreview = this.previewGenerator_ ?
+          this.previewGenerator_.requestPreview() :
+          null;
+      var requestId = requestPreview ? requestPreview.id : -1;
+      if (requestId == -1) {
         this.marginControlContainer_.showMarginControlsIfNeeded();
+        return;
       }
+      cr.dispatchSimpleEvent(
+          this, PreviewArea.EventType.PREVIEW_GENERATION_IN_PROGRESS);
+      if (this.loadingTimeout_ == null) {
+        this.loadingTimeout_ = setTimeout(
+            this.showMessage_.bind(
+                this, print_preview.PreviewAreaMessageId_.LOADING),
+            PreviewArea.LOADING_TIMEOUT_);
+      }
+      requestPreview.request.then(
+          /** @param {number} previewUid The unique id of the preview. */
+          function(previewUid) {
+            this.previewGenerator_.onPreviewGenerationDone(
+                requestPreview.id, previewUid);
+          }.bind(this),
+          /**
+           * @param {*} type The type of print preview failure that
+           *     occurred.
+           */
+          function(type) {
+            if (/** @type{string} */ (type) == 'SETTINGS_INVALID') {
+              this.cancelTimeout();
+              this.showCustomMessage(
+                  loadTimeData.getString('invalidPrinterSettings'));
+              cr.dispatchSimpleEvent(
+                  this, PreviewArea.EventType.SETTINGS_INVALID);
+            } else {
+              this.onPreviewGenerationFail_();
+            }
+          }.bind(this));
     },
 
     /**
      * Called when the preview generator begins loading the preview.
      * @param {Event} event Contains the URL to initialize the plugin to.
      * @private
      */
     onPreviewStart_: function(event) {
       this.isDocumentReady_ = false;
       this.isPluginReloaded_ = false;
@@ skipping 92 matching lines @@
       // pointer events will be sent to the frame. When dragging the margins,
       // we don't want this to happen as it can cause the margin to stop
       // being draggable.
       this.plugin_.style.pointerEvents = isDragging ? 'none' : 'auto';
     }
   };
 
   // Export
   return {PreviewArea: PreviewArea};
 });