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Fixes for block select slowness and jumping caret issues #269

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Fixes for block select slowness and jumping caret issues #269

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a518dc1
Fixes for block select slowness and jumping caret issues
Mar 8, 2021
757a54c
Update solution based on suggestions
Mar 8, 2021
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20 changes: 13 additions & 7 deletions ICSharpCode.AvalonEdit/Editing/RectangleSelection.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -288,12 +288,15 @@ int GetVisualColumnFromXPos(int line, double xPos)
/// <inheritdoc/>
public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
{
TextLocation newStartLocation = textArea.Document.GetLocation(e.GetNewOffset(topLeftOffset, AnchorMovementType.AfterInsertion));
TextLocation newEndLocation = textArea.Document.GetLocation(e.GetNewOffset(bottomRightOffset, AnchorMovementType.BeforeInsertion));

return new RectangleSelection(textArea,
new TextViewPosition(newStartLocation, GetVisualColumnFromXPos(newStartLocation.Line, startXPos)),
new TextViewPosition(newEndLocation, GetVisualColumnFromXPos(newEndLocation.Line, endXPos)));
// we don't want to recalculate the whole selection, as this is called for every line within the selection
// and it can cause selection changes to take a wildly-long time.
return this;
//TextLocation newStartLocation = textArea.Document.GetLocation(e.GetNewOffset(topLeftOffset, AnchorMovementType.AfterInsertion));
//TextLocation newEndLocation = textArea.Document.GetLocation(e.GetNewOffset(bottomRightOffset, AnchorMovementType.BeforeInsertion));

//return new RectangleSelection(textArea,
// new TextViewPosition(newStartLocation, GetVisualColumnFromXPos(newStartLocation.Line, startXPos)),
// new TextViewPosition(newEndLocation, GetVisualColumnFromXPos(newEndLocation.Line, endXPos)));
}

/// <inheritdoc/>
Expand Down Expand Up @@ -331,7 +334,10 @@ public override void ReplaceSelectionWithText(string newText)
pos = new TextViewPosition(document.GetLocation(editOffset + firstInsertionLength));
textArea.ClearSelection();
}
textArea.Caret.Position = textArea.TextView.GetPosition(new Point(GetXPos(textArea, pos), textArea.TextView.GetVisualTopByDocumentLine(Math.Max(startLine, endLine)))).GetValueOrDefault();
TextViewPosition? calculatedPositon = textArea.TextView.GetPosition(new Point(GetXPos(textArea, pos), textArea.TextView.GetVisualTopByDocumentLine(Math.Max(startLine, endLine))));
if (calculatedPositon != null) {
textArea.Caret.Position = calculatedPositon.GetValueOrDefault();
}
}
}

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