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POEclipse RCP - ILazyTreeContentProvider implementation is unexpectedly eager
 

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  1. POEclipse RCP - ILazyTreeContentProvider implementation is unexpectedly eager
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    <p>I am developing an Eclipse RCP application, and am trying to use a <code>ILazyTreeContentProvider</code> implementation in order to show only the visible items at a certain time. </p> <p>The code:</p> <p>Inside the class extending ViewPart:</p> <pre><code>public void createPartControl(Composite parent) { viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.VIRTUAL); drillDownAdapter = new DrillDownAdapter(viewer); viewer.setContentProvider(new ViewContentProvider()); viewer.setLabelProvider(new ViewLabelProvider()); //viewer.setSorter(new NameSorter()); viewer.setInput(getViewSite()); // Create the help context id for the viewer's control PlatformUI.getWorkbench().getHelpSystem().setHelp(viewer.getControl(), "test.provider.lazy.viewer"); makeActions(); hookContextMenu(); hookDoubleClickAction(); contributeToActionBars(); } </code></pre> <p>Inside the ContentProvider:</p> <pre><code>@Override public void updateElement(Object parent, int index) { System.out.println(updateElementCounter++); if (parent.equals(getViewSite())) { if (index == 0) { TreeParent child = new TreeParent("Parent 1"); viewer.replace(parent, index, child); viewer.setHasChildren(child, true); } else { TreeParent child = new TreeParent("Parent 2"); viewer.replace(parent, index, child); viewer.setHasChildren(child, true); //viewer.setChildCount(child, 1); } } else { if (parent instanceof TreeParent) { TreeParent treeParent = (TreeParent) parent; if (treeParent.getName().equals("Parent 1")) { TreeObject child = new TreeObject("Leaf "+index); viewer.replace(treeParent, index, child); viewer.setHasChildren(child, false); //viewer.setChildCount(child, 0); } else { TreeObject child = new TreeObject("Special One"); viewer.replace(treeParent, index, child); viewer.setHasChildren(child, false); //viewer.setChildCount(child,0); } } } } @Override public void updateChildCount(Object element, int currentChildCount) { if (element.equals(getViewSite())) { viewer.setChildCount(getViewSite(), 2); } else if (element instanceof TreeParent) { TreeParent parent = (TreeParent) element; if (parent.getName().equals("Root")) { viewer.setChildCount(parent, 2); } else if (parent.getName().equals("Parent 1")) { viewer.setChildCount(parent, 20); } else { viewer.setChildCount(parent, 1); } } else { viewer.setChildCount(element, 0); } } </code></pre> <p>The problem is that each time I expand the children of a TreeItem, it loads all the subelements, not just the visible ones, whereas the <code>System.out.println(updateElementCounter++);</code> command prints out all 22 despite having only 7 Tree Items visible.</p> <p><img src="https://i.stack.imgur.com/QLSRf.png" alt="enter image description here"></p> <p>Shouldn't the <code>ILazyTreeContentProvider</code> only load the ones that are visible? (In this case it's 7 items) </p> <p>I must be doing something wrong...</p> <p>Anyways, any opinions are very appreciated!</p>
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