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Handling Selection get/set in TextInputMethodClient #421

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Handling Selection get/set in TextInputMethodClient #421

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caf8083
Change TextInputMethodClient Selection
May 2, 2024
4b26b40
Remove not necessary checks
May 2, 2024
e42d97e
Merge branch 'master' into selection-change
Necromanika May 31, 2024
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56 changes: 50 additions & 6 deletions src/AvaloniaEdit/Editing/TextArea.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1137,6 +1137,7 @@ public void RaiseScrollInvalidated(EventArgs e)
private class TextAreaTextInputMethodClient : TextInputMethodClient
{
private TextArea _textArea;
private TextSelection _emptySelection;

public TextAreaTextInputMethodClient()
{
Expand Down Expand Up @@ -1196,17 +1197,39 @@ public override TextSelection Selection
{
if (_textArea == null)
return new TextSelection(0, 0);
return new TextSelection(_textArea.Caret.Position.Column, _textArea.Caret.Position.Column + _textArea.Selection.Length);

if (_textArea.Selection.IsEmpty)
return _emptySelection;

var startLocation = _textArea.Selection.StartPosition.Location;
var endLocation = _textArea.Selection.EndPosition.Location;

var lineNumber = _textArea.Caret.Line;
var line = _textArea.Document.GetLineByNumber(lineNumber);

var selectionStart = startLocation.Line == lineNumber
? startLocation.Column - 1
: line.Offset;
var selectionEnd = endLocation.Line == lineNumber
? endLocation.Column - 1
: line.EndOffset;

return new TextSelection(selectionStart, selectionEnd);
}
set
{
if (_textArea == null) return;
var selection = _textArea.Selection;
if (selection.StartPosition.Line == 0) return;
var selection = _textArea.Selection;

var lineNumber = _textArea.Caret.Line;
var start = value.Start + 1;
var end = value.End + 1;

_textArea.Selection = selection.StartSelectionOrSetEndpoint(
new TextViewPosition(selection.StartPosition.Line, value.Start),
new TextViewPosition(selection.StartPosition.Line, value.End));
new TextViewPosition(lineNumber, start),
new TextViewPosition(lineNumber, end));

RaiseSelectionChanged();
}
}

Expand All @@ -1215,13 +1238,15 @@ public void SetTextArea(TextArea textArea)
if (_textArea != null)
{
_textArea.Caret.PositionChanged -= Caret_PositionChanged;
_textArea.SelectionChanged -= TextArea_SelectionChanged;
}

_textArea = textArea;

if (_textArea != null)
{
_textArea.Caret.PositionChanged += Caret_PositionChanged;
_textArea.SelectionChanged += TextArea_SelectionChanged;
}

RaiseTextViewVisualChanged();
Expand All @@ -1231,11 +1256,30 @@ public void SetTextArea(TextArea textArea)
RaiseSurroundingTextChanged();
}

private void TextArea_SelectionChanged(object sender, EventArgs e)
{
RaiseSelectionChanged();
}

private void Caret_PositionChanged(object sender, EventArgs e)
{
RaiseCursorRectangleChanged();
RaiseSurroundingTextChanged();
RaiseSelectionChanged();

if (_textArea.Selection.IsEmpty)
{
// We need to select something before empty selection so that the IME be able to complete/correct words
// Atleast while its working so
// Maybe this was designed for Avalonia TextBox where selection changing by two steps (start index, end index)
var currentSelectionIdx = _textArea.Caret.Position.Column - 1;

// Raise selection step by step to new location
_emptySelection.Start = currentSelectionIdx;
RaiseSelectionChanged();

_emptySelection.End = currentSelectionIdx;
RaiseSelectionChanged();
}
}

public override void SetPreeditText(string text)
Expand Down