Only update the `max-height` of the `SecondaryToolbar` when it's actually visible

There's really no good reason to attempt to adjust the `max-height` of the `SecondaryToolbar` when it's not visible, so let's not do that anymore.
Also, we can listen for the `resize` event in `SecondaryToolbar`, to avoid having to manually call the `max-height` adjust function from various event handlers in `app.js`. Please note that by always adjusting the `max-height` when the toolbar is opened we no longer need the `localized` event, since it was mainly used to set a correct inital `max-height` value.

web/app.js

@@ -270,7 +270,7 @@ var PDFViewerApplication = {
       new PDFDocumentProperties(appConfig.documentProperties);
 
     this.secondaryToolbar =
-      new SecondaryToolbar(appConfig.secondaryToolbar, eventBus);
+      new SecondaryToolbar(appConfig.secondaryToolbar, container, eventBus);
 
     if (this.supportsFullscreen) {
       this.pdfPresentationMode = new PDFPresentationMode({
@@ -1807,10 +1807,6 @@ function webViewerResize() {
     }
     PDFViewerApplication.pdfViewer.update();
   }
-
-  // Set the 'max-height' CSS property of the secondary toolbar.
-  var mainContainer = PDFViewerApplication.appConfig.mainContainer;
-  PDFViewerApplication.secondaryToolbar.setMaxHeight(mainContainer);
 }
 
 window.addEventListener('hashchange', function webViewerHashchange(evt) {
@@ -1894,10 +1890,6 @@ function webViewerLocalized() {
       container.setAttribute('style', 'min-width: ' + width + 'px; ' +
                                       'max-width: ' + width + 'px;');
     }
-
-    // Set the 'max-height' CSS property of the secondary toolbar.
-    var mainContainer = PDFViewerApplication.appConfig.mainContainer;
-    PDFViewerApplication.secondaryToolbar.setMaxHeight(mainContainer);
   });
 }
 

web/secondary_toolbar.js

@@ -34,6 +34,9 @@ var mozL10n = uiUtils.mozL10n;
  * @property {HTMLDivElement} toolbar - Container for the secondary toolbar.
  * @property {HTMLButtonElement} toggleButton - Button to toggle the visibility
  *   of the secondary toolbar.
+ * @property {HTMLDivElement} toolbarButtonContainer - Container where all the
+ *   toolbar buttons are placed. The maximum height of the toolbar is controlled
+ *   dynamically by adjusting the 'max-height' CSS property of this DOM element.
  * @property {HTMLButtonElement} presentationModeButton - Button for entering
  *   presentation mode.
  * @property {HTMLButtonElement} openFileButton - Button to open a file.
@@ -63,11 +66,13 @@ var SecondaryToolbar = (function SecondaryToolbarClosure() {
   /**
    * @constructs SecondaryToolbar
    * @param {SecondaryToolbarOptions} options
+   * @param {HTMLDivElement} mainContainer
    * @param {EventBus} eventBus
    */
-  function SecondaryToolbar(options, eventBus) {
+  function SecondaryToolbar(options, mainContainer, eventBus) {
     this.toolbar = options.toolbar;
     this.toggleButton = options.toggleButton;
+    this.toolbarButtonContainer = options.toolbarButtonContainer;
     this.buttons = [
       { element: options.presentationModeButton, eventName: 'presentationmode',
         close: true },
@@ -87,16 +92,19 @@ var SecondaryToolbar = (function SecondaryToolbarClosure() {
         eventName: 'documentproperties', close: true }
     ];
 
+    this.mainContainer = mainContainer;
     this.eventBus = eventBus;
 
     this.opened = false;
+    this.containerHeight = null;
     this.previousContainerHeight = null;
-    this.newContainerHeight = null;
-    this.buttonContainer = this.toolbar.firstElementChild;
 
     // Bind the event listeners for click and hand tool actions.
     this._bindClickListeners();
     this._bindHandToolListener(options.toggleHandToolButton);
+
+    // Bind the event listener for adjusting the 'max-height' of the toolbar.
+    this.eventBus.on('resize', this._setMaxHeight.bind(this));
   }
 
   SecondaryToolbar.prototype = {
@@ -155,6 +163,8 @@ var SecondaryToolbar = (function SecondaryToolbarClosure() {
         return;
       }
       this.opened = true;
+      this._setMaxHeight();
+
       this.toggleButton.classList.add('toggled');
       this.toolbar.classList.remove('hidden');
     },
@@ -176,18 +186,22 @@ var SecondaryToolbar = (function SecondaryToolbarClosure() {
       }
     },
 
-    setMaxHeight: function SecondaryToolbar_setMaxHeight(container) {
-      if (!container || !this.buttonContainer) {
-        return;
+    /**
+     * @private
+     */
+    _setMaxHeight: function SecondaryToolbar_setMaxHeight() {
+      if (!this.opened) {
+        return; // Only adjust the 'max-height' if the toolbar is visible.
       }
-      this.newContainerHeight = container.clientHeight;
-      if (this.previousContainerHeight === this.newContainerHeight) {
+      this.containerHeight = this.mainContainer.clientHeight;
+
+      if (this.containerHeight === this.previousContainerHeight) {
         return;
       }
-      var maxHeight = this.newContainerHeight - SCROLLBAR_PADDING;
-      this.buttonContainer.setAttribute('style',
-        'max-height: ' + maxHeight + 'px;');
-      this.previousContainerHeight = this.newContainerHeight;
+      this.toolbarButtonContainer.setAttribute('style',
+        'max-height: ' + (this.containerHeight - SCROLLBAR_PADDING) + 'px;');
+
+      this.previousContainerHeight = this.containerHeight;
     }
   };
 

web/viewer.js

@@ -79,6 +79,8 @@ function getViewerConfiguration() {
     secondaryToolbar: {
       toolbar: document.getElementById('secondaryToolbar'),
       toggleButton: document.getElementById('secondaryToolbarToggle'),
+      toolbarButtonContainer:
+        document.getElementById('secondaryToolbarButtonContainer'),
       presentationModeButton:
         document.getElementById('secondaryPresentationMode'),
       openFileButton: document.getElementById('secondaryOpenFile'),