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 153 matching lines @@
      * @private
      */
     this.overlayEl_ = null;
 
     /**
      * The "Open system dialog" button.
      * @type {HTMLButtonElement}
      * @private
      */
     this.openSystemDialogButton_ = null;
+
+    /**
+     * If this is in a browser test (fake plugin).
+     * @private {boolean}
+     */
+    this.isBrowserTest_ = false;
   }
 
   /**
    * Event types dispatched by the preview area.
    * @enum {string}
    */
   PreviewArea.EventType = {
     // Dispatched when the "Open system dialog" button is clicked.
     OPEN_SYSTEM_DIALOG_CLICK:
         'print_preview.PreviewArea.OPEN_SYSTEM_DIALOG_CLICK',
 
     // 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()) {
+      if (!this.previewGenerator_)
+        return;
+      var previewRequest = this.previewGenerator_.requestPreview();
+      if (previewRequest.id > -1) {
         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_);
         }
+        previewRequest.request.then(
+            /** @param {number} previewUid The unique id of the preview. */
+            function(previewUid) {
+              this.previewGenerator_.onPreviewGenerationDone(
+                  previewRequest.id, previewUid);
+            }.bind(this),
+            /**
+             * @param {*} type The type of print preview failure that
+             *     occurred.
+             */
+            function(type) {
+              if (/** @type{string} */ (type) == 'CANCELLED')
+                return;  // overriden by a new request, do nothing.
+              else 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));
       } else {
         this.marginControlContainer_.showMarginControlsIfNeeded();
       }
     },
 
     /**
      * Called when the preview generator begins loading the preview.
      * @param {Event} event Contains the URL to initialize the plugin to.
      * @private
      */
@@ skipping 22 matching lines @@
       this.plugin_.loadPreviewPage(event.previewUrl, event.previewIndex);
     },
 
     /**
      * Called when the preview generation is complete and the document is ready
      * to print.
      * @private
      */
     onDocumentReady_: function(event) {
       this.isDocumentReady_ = true;
+      if (this.isBrowserTest_)
+        this.isPluginReloaded_ = true;
       this.dispatchPreviewGenerationDoneIfReady_();
     },
 
     /**
      * Cancels the timeout so that an error message can be shown.
      */
     cancelTimeout: function() {
       if (this.loadingTimeout_) {
         clearTimeout(this.loadingTimeout_);
         this.loadingTimeout_ = null;
@@ skipping 47 matching lines @@
      */
     onMarginDragChanged_: function(isDragging) {
       if (!this.plugin_)
         return;
 
       // When hovering over the plugin (which may be in a separate iframe)
       // 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';
+    },
+
+    /** @param {boolean} isTest Whether this instance is in a browser test. */
+    setIsBrowserTest: function(isTest) {
+      this.isBrowserTest_ = isTest;
     }
   };
 
   // Export
   return {PreviewArea: PreviewArea};
 });