Add WTableView::visibleRowCount

Author: m-seibt

src/Wt/WTableView.C

@@ -1893,6 +1893,14 @@ WModelIndex WTableView::modelIndexAt(WWidget *widget) const
   return WModelIndex();
 }
 
+int WTableView::visibleRowCount() const
+{
+  if (ajaxMode())
+    return viewportHeight_ / static_cast<int>(rowHeight().toPixels());
+  else
+    return renderedLastRow_ - renderedFirstRow_;
+}
+
 WModelIndex WTableView::translateModelIndex(bool headerColumns,
                                             const WMouseEvent& event)
 {

src/Wt/WTableView.h

@@ -158,6 +158,12 @@ class WT_API WTableView : public WAbstractItemView
    */
   WModelIndex modelIndexAt(WWidget *widget) const;
 
+  /*! \brief Returns the number of entirely visible rows.
+   *
+   * \note In plain HTML mode, it returns a guess based on the rendered rows.
+   */
+  int visibleRowCount() const;
+
   virtual EventSignal<WScrollEvent>& scrolled() override;
 
 #ifdef WT_TEST_VISIBILITY