[CUPS] Implement the local CUPS printer setup waiting UI.

chrome/browser/resources/print_preview/search/destination_list_item.js

Index: chrome/browser/resources/print_preview/search/destination_list_item.js
diff --git a/chrome/browser/resources/print_preview/search/destination_list_item.js b/chrome/browser/resources/print_preview/search/destination_list_item.js
index 8b529d45acc919b3f3d5aec44328569b9268b49c..91424f9f6f05e19cf7bc410610f16eafbc59728c 100644
--- a/chrome/browser/resources/print_preview/search/destination_list_item.js
+++ b/chrome/browser/resources/print_preview/search/destination_list_item.js
@@ -53,6 +53,8 @@ cr.define('print_preview', function() {
    * @enum {string}
    */
   DestinationListItem.EventType = {
+    // Dispatched to check the printer needs to be configured before activation.
+    CONFIGURE_REQUEST: 'print_preview.DestinationListItem.CONFIGURE_REQUEST',
     // Dispatched when the list item is activated.
     SELECT: 'print_preview.DestinationListItem.SELECT',
     REGISTER_PROMO_CLICKED:
@@ -99,6 +101,49 @@ cr.define('print_preview', function() {
     },
 
     /**
+     * Called if the printer configuration request is accepted. Show the waiting
+     * message to the user as the configuration might take longer than expected.
+     */
+    onConfigureRequestAccepted: function() {
+      // It must be a Chrome OS CUPS printer which hasn't been set up before.
+      assert(
+          this.destination_.origin == print_preview.Destination.Origin.CROS &&
+          !this.destination_.capabilities);
+      this.updateConfiguringMessage_(true);
+    },
+
+    /**
+     * Called if the printer configuration request is rejected. The request is
+     * rejected if another printer is setting up in process or the current
+     * printer doesn't need to be setup.
+     * @param {boolean} otherPrinterSetupInProgress
+     */
+    onConfigureRequestRejected: function(otherPrinterSetupInProgress) {
+      // If another printer setup is in progress, the printer should not be
+      // activated.
+      if (!otherPrinterSetupInProgress)
+        this.onDestinationActivated_();
+    },
+
+    /**
+     * Called when the printer configuration request is resolved successful or
+     * failed.
+     * @param response {!print_preview.PrinterSetupResponse}
+     */
+    onConfigureResolved: function(response) {
+      assert(response.printerId == this.destination_.id);
+      if (response.success) {
+        this.updateConfiguringMessage_(false);
+        this.destination_.capabilities = response.capabilities;
+        this.onDestinationActivated_();
+      } else {
+        this.updateConfiguringMessage_(false);
+        setIsVisible(
+            this.getChildElement('.configuring-failed-text'), true);
+      }
+    },
+
+    /**
      * Initializes the element with destination's info.
      * @private
      */
@@ -171,6 +216,13 @@ cr.define('print_preview', function() {
           this.getChildElement('.register-promo'),
           this.destination_.connectionStatus ==
               print_preview.Destination.ConnectionStatus.UNREGISTERED);
+
+      if (cr.isChromeOS) {
+        // Reset the configuring messages for CUPS printers.
+        this.updateConfiguringMessage_(false);
+        setIsVisible(
+            this.getChildElement('.configuring-failed-text'), false);
+      }
     },
 
     /**
@@ -195,11 +247,43 @@ cr.define('print_preview', function() {
     },
 
     /**
-     * Called when the destination item is activated. Dispatches a SELECT event
-     * on the given event target.
+     * Shows/Hides the configuring in progress message and starts/stops its
+     * animation accordingly.
+     * @param {bool} show If the message and animation should be shown.
+     * @private
+     */
+    updateConfiguringMessage_: function(show) {
+      setIsVisible(
+          this.getChildElement('.configuring-in-progress-text'), show);
+      this.getChildElement('.configuring-text-jumping-dots')
+          .classList.toggle('jumping-dots', show);
+    },
+
+    /**
+     * Called when the destination item is activated. Check if the printer needs
+     * to be set up first before activation.
      * @private
      */
     onActivate_: function() {
+      if (!cr.isChromeOS) {
+        onDestinationActivated_();
+        return;
+      }
+
+      // Check if the printer needs configuration before using. The user is only
+      // allowed to set up one printer at one time.
+      var configureEvent = new CustomEvent(
+          DestinationListItem.EventType.CONFIGURE_REQUEST,
+          {detail: {destination: this.destination_}});
+      this.eventTarget_.dispatchEvent(configureEvent);
+    },
+
+    /**
+     * Called when the destination has been resolved successfully and needs to
+     * be activated. Dispatches a SELECT event on the given event target.
+     * @private
+     */
+    onDestinationActivated_: function() {
       if (this.destination_.id ==
               print_preview.Destination.GooglePromotedId.FEDEX &&
           !this.destination_.isTosAccepted) {