/// <summary>
/// Get the preview temp file for a file extension.
/// If the temp file already exists, use that one. Otherwise, create a new one.
/// </summary>
/// <param name="fileExtension">The file extension.</param>
/// <returns>The preview temp file with file path, invisible editor and text buffer inforamtion.</returns>
private PreviewTempFile GetPreviewTempFile(string fileExtension)
{
ArgumentValidation.CheckForNullReference(fileExtension, "fileExtension");
PreviewTempFile tempFile = null;
// If the temp file already exists, use that one.
if (!_tempFiles.TryGetValue(fileExtension, out tempFile))
{
var failed = false;
// Create a new preview temp file
var tempFilePath = CreatePreviewTempFile(fileExtension);
if (!File.Exists(tempFilePath))
{
// Failed to create the temp file.
failed = true;
}
else
{
// Open the file in invisible editor and get text buffer from it.
IVsInvisibleEditor invisibleEditor = null;
IVsTextLines textBuffer = null;
if (RdtManager.Instance.TryGetTextLinesAndInvisibleEditor(tempFilePath, out invisibleEditor, out textBuffer) &&
invisibleEditor != null &&
textBuffer != null)
{
// Temp file is opened in invisible editor, and we got the text buffer from it.
tempFile = new PreviewTempFile(tempFilePath, invisibleEditor, textBuffer);
_tempFiles.Add(fileExtension, tempFile);
}
else
{
failed = true;
}
}
if (failed)
{
// Failed to get InvisibleEditor or TextBuffer for that file,
// throw exception.
throw new InvalidOperationException(
string.Format(
CultureInfo.CurrentCulture,
Resources.Exception_CannotGetTextBuffer,
tempFilePath));
}
}
return(tempFile);
}
/// <summary>
/// Get the preview temp file for a file extension.
/// If the temp file already exists, use that one. Otherwise, create a new one.
/// </summary>
/// <param name="fileExtension">The file extension.</param>
/// <returns>The preview temp file with file path, invisible editor and text buffer inforamtion.</returns>
private PreviewTempFile GetPreviewTempFile(string fileExtension)
{
ArgumentValidation.CheckForNullReference(fileExtension, "fileExtension");
PreviewTempFile tempFile = null;
// If the temp file already exists, use that one.
if (!_tempFiles.TryGetValue(fileExtension, out tempFile))
{
var failed = false;
// Create a new preview temp file
var tempFilePath = CreatePreviewTempFile(fileExtension);
if (!File.Exists(tempFilePath))
{
// Failed to create the temp file.
failed = true;
}
else
{
// Open the file in invisible editor and get text buffer from it.
IVsInvisibleEditor invisibleEditor = null;
IVsTextLines textBuffer = null;
if (RdtManager.Instance.TryGetTextLinesAndInvisibleEditor(tempFilePath, out invisibleEditor, out textBuffer)
&& invisibleEditor != null
&& textBuffer != null)
{
// Temp file is opened in invisible editor, and we got the text buffer from it.
tempFile = new PreviewTempFile(tempFilePath, invisibleEditor, textBuffer);
_tempFiles.Add(fileExtension, tempFile);
}
else
{
failed = true;
}
}
if (failed)
{
// Failed to get InvisibleEditor or TextBuffer for that file,
// throw exception.
throw new InvalidOperationException(
string.Format(
CultureInfo.CurrentCulture,
Resources.Exception_CannotGetTextBuffer,
tempFilePath));
}
}
return tempFile;
}
/// <summary>
/// Display the refactoring preview for a selected preview changes node.
/// </summary>
/// <param name="vsTextView">The text view to show the file contents.</param>
/// <param name="fileChange">All changes in one file.</param>
/// <param name="node">The selected PreviewChangesNode.</param>
public void DisplayPreview(IVsTextView vsTextView, FileChange fileChange, PreviewChangesNode node)
{
ArgumentValidation.CheckForNullReference(vsTextView, "vsTextView");
ArgumentValidation.CheckForNullReference(node, "previewChangeNode");
if (fileChange != null)
{
// Get the temp file for this file extension, and copy all file content to the temp file text buffer
PreviewTempFile tempFile = null;
try
{
tempFile = GetPreviewTempFile(Path.GetExtension(fileChange.FileName));
}
catch (InvalidOperationException)
{
// Failed to get text buffer, just set the text view to nothing.
NativeMethods.ThrowOnFailure(vsTextView.SetBuffer(_bufferForNoChanges));
return;
}
// Copy the content of source file to that temp file text buffer
CopyFileToBuffer(fileChange.FileName, tempFile.TextBuffer);
// Create text markers on all changes on this file
RefactoringOperationBase.ApplyChangesToOneFile(fileChange, tempFile.TextBuffer, true, node.ChangeProposal);
// Set language service ID
// Get Language service ID on this change node
var languageServiceID = node.LanguageServiceID;
if (languageServiceID == Guid.Empty &&
node.ChildList != null &&
node.ChildList.Count > 0)
{
// If can not get the language service ID, check if it has child nodes
// if so, get the language service ID for first change in this file node.
languageServiceID = node.ChildList[0].LanguageServiceID;
}
if (languageServiceID != Guid.Empty)
{
NativeMethods.ThrowOnFailure(tempFile.TextBuffer.SetLanguageServiceID(ref languageServiceID));
}
// Set the vsTextView with textBuffer
NativeMethods.ThrowOnFailure(vsTextView.SetBuffer(tempFile.TextBuffer));
// Ensure visible of first line and set the caret to position (0,0)
ScrollInView(vsTextView, 0, 0, 0, 1);
// If there is ChangeProposal, make sure that change is visible in the text view.
// If ChangeProposal is null, that might be file node, make the first chagne visible.
// Here we will only work with Text based change proposal.
var visibleChange = node.ChangeProposal as TextChangeProposal;
if (visibleChange == null)
{
// Try to get first change in this file
if (node.ChildList != null &&
node.ChildList.Count > 0)
{
visibleChange = node.ChildList[0].ChangeProposal as TextChangeProposal;
}
}
if (visibleChange != null)
{
// There are some changes, create TextSpan for first change,
// and make the cursor position to that TextSpan.
ScrollInView(
vsTextView, visibleChange.StartLine, visibleChange.StartColumn,
visibleChange.EndLine, visibleChange.EndColumn);
}
// Save the state, this will be used to refresh the text view when preview request
// changed, such as check/uncheck
_lastTextView = vsTextView;
_lastDisplayedFileChange = fileChange;
_lastDisplayedNode = node;
}
else
{
// No related file to this node, set nothing for the text view.
NativeMethods.ThrowOnFailure(vsTextView.SetBuffer(_bufferForNoChanges));
}
}
