/// <summary>
/// Construct a new edit span object
/// </summary>
/// <param name="toReplace">The text span to remove from the buffer (can be empty)</param>
/// <param name="insertText">The text to insert in it's place (can be null)</param>
internal EditSpan(TextSpan toReplace, string insertText)
{
if (!TextSpanHelper.IsPositive(toReplace))
{
TextSpanHelper.MakePositive(ref toReplace);
}
this.span = toReplace;
this.text = insertText;
this.lineCount = -1;
}
// It is important that this function not throw an exception.
protected override void OnNavigate(EventArgs e)
{
try {
TextSpan span = this.span;
if (textLineMarker != null)
{
TextSpan[] spanArray = new TextSpan[1];
if (NativeMethods.Failed(textLineMarker.GetCurrentSpan(spanArray)))
{
Debug.Assert(false, "Unexpected error getting current span in OnNavigate");
return;
}
span = spanArray[0];
}
IVsUIHierarchy hierarchy;
uint itemID;
IVsWindowFrame docFrame;
IVsTextView textView;
try {
VsShell.OpenDocument(this.site, this.fileName, NativeMethods.LOGVIEWID_Code, out hierarchy, out itemID, out docFrame, out textView);
} catch (System.ArgumentException) {
// No assert here because this can legitimately happen when quickly doing F8 during a refresh of language service errors (see 4846)
return;
}
catch (System.IO.FileNotFoundException)
{
// No assert here because this can legitimately happen, e.g. with type provider errors (which are attributed to "FSC" file), or other cases
return;
}
if (NativeMethods.Failed(docFrame.Show()))
{
// No assert here because this can legitimately happen when quickly doing F8 during a refresh of language service errors (see 4846)
return;
}
if (textView != null)
{
// In the off-chance these methods fail, we 'recover' by continuing. It is more helpful to show the user the file if possible than not.
textView.SetCaretPos(span.iStartLine, span.iStartIndex);
TextSpanHelper.MakePositive(ref span);
textView.SetSelection(span.iStartLine, span.iStartIndex, span.iEndLine, span.iEndIndex);
textView.EnsureSpanVisible(span);
}
base.OnNavigate(e);
} catch (Exception exn) {
System.Diagnostics.Debug.Assert(false, "Unexpected exception thrown from DocumentTask.OnNavigate" + exn.ToString() + exn.StackTrace);
}
}
