/// <include file='doc\ShellDocumentManager.uex' path='docs/doc[@for="ShellDocumentManager.GetHostFromFrame"]/*' />
/// <devdoc>
/// Private helper buddy that tries to get an IDesignerHost from a window frame. This will
/// return null if the host could not be resolved.
/// </devdoc>
private IDesignerHost GetHostFromFrame(IVsWindowFrame frame)
{
if (frame != null)
{
// Get the document view and see if it's one of ours
//
Object view = null;
int hr = NativeMethods.S_OK;
#if GETPROPERTY_MARSHAL
hr = frame.GetProperty(__VSFPROPID.VSFPROPID_DocView, ref view);
if (!NativeMethods.Succeeded(hr))
{
Debug.Fail("Error getting document view for IVsWindowFrame... hresult=0x" + Convert.ToString(hr, 16));
throw new COMException("Error getting document view", hr);
}
#else
view = frame.GetProperty(__VSFPROPID.VSFPROPID_DocView);
#endif
IDesignerHost host = null;
if (view is IServiceProvider)
{
host = ((IServiceProvider)view).GetService(typeof(IVSMDDesigner)) as IDesignerHost;
}
if (host == null && view is NativeMethods.IOleServiceProvider)
{
// We query the view for IVSMDDesigner, which will succeed for HTMED and vswindow panes,
// etc.
//
Guid tmpGuid = (typeof(IVSMDDesigner)).GUID;
IntPtr pUnk;
hr = ((NativeMethods.IOleServiceProvider)view).QueryService(ref tmpGuid, ref tmpGuid, out pUnk);
if (NativeMethods.Failed(hr) || pUnk == (IntPtr)0)
{
Debug.Assert(NativeMethods.Failed(hr), "QueryService succeeded but reurned a NULL pointer.");
return(null);
}
object obj = Marshal.GetObjectForIUnknown(pUnk);
Marshal.Release(pUnk);
host = (IDesignerHost)obj;
}
return(host);
}
return(null);
}
protected virtual IVsTextLines GetTextBuffer(System.IntPtr docDataExisting, string filename)
{
ThreadHelper.ThrowIfNotOnUIThread();
IVsTextLines textLines;
if (docDataExisting == IntPtr.Zero)
{
// Create a new IVsTextLines buffer.
Type textLinesType = typeof(IVsTextLines);
Guid riid = textLinesType.GUID;
Guid clsid = typeof(VsTextBufferClass).GUID;
textLines = _package.CreateInstance(ref clsid, ref riid, textLinesType) as IVsTextLines;
// set the buffer's site
((IObjectWithSite)textLines).SetSite(_serviceProvider.GetService(typeof(IOleServiceProvider)));
}
else
{
// Use the existing text buffer
object dataObject = Marshal.GetObjectForIUnknown(docDataExisting);
textLines = dataObject as IVsTextLines;
if (textLines == null)
{
// Try get the text buffer from textbuffer provider
if (dataObject is IVsTextBufferProvider textBufferProvider)
{
textBufferProvider.GetTextBuffer(out textLines);
}
}
if (textLines == null)
{
// Unknown docData type then, so we have to force VS to close the other editor.
throw Marshal.GetExceptionForHR(VSConstants.VS_E_INCOMPATIBLEDOCDATA);
}
}
return(textLines);
}