bool IsEmptySelectionContext(IVsTrackSelectionEx selCtx)
{
ThreadHelper.ThrowIfNotOnUIThread();
Validate.IsNotNull(selCtx, "selCtx");
IVsMonitorSelection2 monitorSelection2 = Package.GetGlobalService(typeof(SVsShellMonitorSelection)) as IVsMonitorSelection2;
monitorSelection2.GetEmptySelectionContext(out var emptySelCtxt);
return(ComUtilities.IsSameComObject(selCtx, emptySelCtxt));
}
/// <summary>
/// Create the list of selection elements for the selection view. This includes the core slots as well as any
/// registered extension provided selection elenents
/// </summary>
void InitializeSelectionItems()
{
ThreadHelper.ThrowIfNotOnUIThread();
IVsMonitorSelection selectionMonitor = Package.GetGlobalService(typeof(SVsShellMonitorSelection)) as IVsMonitorSelection;
object elementValue;
string elementName;
// Initialize the current selection objects
IVsHierarchy hierarchy = null;
ISelectionContainer selectionContainer = null;
selectionMonitor.GetCurrentSelection(out var pHierarchy, out var itemID, out var multiSelect, out var pSelectionContainer);
if (pHierarchy != IntPtr.Zero)
{
hierarchy = Marshal.GetObjectForIUnknown(pHierarchy) as IVsHierarchy;
}
if (pSelectionContainer != IntPtr.Zero)
{
selectionContainer = Marshal.GetObjectForIUnknown(pSelectionContainer) as ISelectionContainer;
}
// Sync descriptions with selection by calling OnSelectionChanged
SelectionItems.Add(new SelectionItemInfo((VSConstants.SelectionElement)SelectionItemInfo.SpecialElement.Hierarchy, description: string.Empty, owner: string.Empty));
SelectionItems.Add(new SelectionItemInfo((VSConstants.SelectionElement)SelectionItemInfo.SpecialElement.ItemID, description: string.Empty, owner: string.Empty));
SelectionItems.Add(new SelectionItemInfo((VSConstants.SelectionElement)SelectionItemInfo.SpecialElement.SelectionContainer, description: string.Empty, owner: string.Empty));
SelectionItems.Add(new SelectionItemInfo((VSConstants.SelectionElement)SelectionItemInfo.SpecialElement.MultiItemSelect, description: string.Empty, owner: string.Empty));
OnSelectionChanged(null, 0, null, null, hierarchy, itemID, multiSelect, selectionContainer);
// Initialize the current selection data with the element values
VSConstants.SelectionElement[] elements = { VSConstants.SelectionElement.WindowFrame,
VSConstants.SelectionElement.DocumentFrame,
VSConstants.SelectionElement.UndoManager,
VSConstants.SelectionElement.StartupProject,
VSConstants.SelectionElement.UserContext,
VSConstants.SelectionElement.PropertyBrowserSID,
VSConstants.SelectionElement.ResultList,
VSConstants.SelectionElement.LastWindowFrame };
foreach (VSConstants.SelectionElement element in elements)
{
selectionMonitor.GetCurrentElementValue((uint)element, out elementValue);
object valueOwner = GetOwnerForSelectedElement(element);
SelectionItems.Add(new SelectionItemInfo(element, GetSelectionElementDescription(elementValue), GetSelectionElementDescription(valueOwner)));
}
// Read the VSIP registered selection elements
// Skip this one, it is not supported yet and will always be empty
Guid surfaceSelectionElement = new Guid("{64db9e55-5614-44b3-93c9-e617b95eeb5f}");
IVsMonitorSelection2 selectionMonitor2 = Package.GetGlobalService(typeof(SVsShellMonitorSelection)) as IVsMonitorSelection2;
using RegistryKey rootKey = GetRegistryRoot();
using RegistryKey elementsKey = rootKey.OpenSubKey("SelectionElements");
if (elementsKey != null)
{
string[] elementGuids = elementsKey.GetSubKeyNames();
foreach (string guidString in elementGuids)
{
using RegistryKey elementKey = elementsKey.OpenSubKey(guidString);
Guid elementGuid = new Guid(guidString);
selectionMonitor2.GetElementID(ref elementGuid, out var selElem);
selectionMonitor.GetCurrentElementValue(selElem, out elementValue);
elementName = (string)elementKey.GetValue("Name", defaultValue: string.Empty);
// Skip this one, it is not supported yet and will always be empty
if (elementGuid == surfaceSelectionElement)
{
continue;
}
object contextOwner = GetOwnerForSelectedElement((VSConstants.SelectionElement)selElem);
SelectionItems.Add(new SelectionItemInfo((VSConstants.SelectionElement)selElem, elementName, GetSelectionElementDescription(elementValue), GetSelectionElementDescription(contextOwner)));
}
}
}