/// <summary>
/// Creates a new TextAreaDefaultInputHandler instance.
/// </summary>
public TextAreaDefaultInputHandler(TextArea textArea) : base(textArea)
{
this.NestedInputHandlers.Add(CaretNavigation = CaretNavigationCommandHandler.Create(textArea));
this.NestedInputHandlers.Add(Editing = EditingCommandHandler.Create(textArea));
this.NestedInputHandlers.Add(MouseSelection = new SelectionMouseHandler(textArea));
this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Undo, ExecuteUndo, CanExecuteUndo));
this.CommandBindings.Add(new CommandBinding(ApplicationCommands.Redo, ExecuteRedo, CanExecuteRedo));
}
static ExecutedRoutedEventHandler OnDelete(CaretMovementType caretMovement)
{
return((target, args) => {
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
if (textArea.Selection.IsEmpty)
{
TextViewPosition startPos = textArea.Caret.Position;
bool enableVirtualSpace = textArea.Options.EnableVirtualSpace;
// When pressing delete; don't move the caret further into virtual space - instead delete the newline
if (caretMovement == CaretMovementType.CharRight)
{
enableVirtualSpace = false;
}
double desiredXPos = textArea.Caret.DesiredXPos;
TextViewPosition endPos = CaretNavigationCommandHandler.GetNewCaretPosition(
textArea.TextView, startPos, caretMovement, enableVirtualSpace, ref desiredXPos);
// GetNewCaretPosition may return (0,0) as new position,
// thus we need to validate endPos before using it in the selection.
if (endPos.Line < 1 || endPos.Column < 1)
{
endPos = new TextViewPosition(Math.Max(endPos.Line, 1), Math.Max(endPos.Column, 1));
}
// Don't do anything if the number of lines of a rectangular selection would be changed by the deletion.
if (textArea.Selection is RectangleSelection && startPos.Line != endPos.Line)
{
return;
}
// Don't select the text to be deleted; just reuse the ReplaceSelectionWithText logic
// Reuse the existing selection, so that we continue using the same logic
textArea.Selection.StartSelectionOrSetEndpoint(startPos, endPos)
.ReplaceSelectionWithText(string.Empty);
}
else
{
textArea.RemoveSelectedText();
}
textArea.Caret.BringCaretToView();
args.Handled = true;
}
});
}
static ExecutedRoutedEventHandler OnDelete(CaretMovementType caretMovement)
{
return((target, args) => {
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
if (textArea.Selection.IsEmpty)
{
TextViewPosition startPos = textArea.Caret.Position;
bool enableVirtualSpace = textArea.Options.EnableVirtualSpace;
// When pressing delete; don't move the caret further into virtual space - instead delete the newline
if (caretMovement == CaretMovementType.CharRight)
{
enableVirtualSpace = false;
}
double desiredXPos = textArea.Caret.DesiredXPos;
TextViewPosition endPos = CaretNavigationCommandHandler.GetNewCaretPosition(
textArea.TextView, startPos, caretMovement, enableVirtualSpace, ref desiredXPos);
// GetNewCaretPosition may return (0,0) as new position,
// thus we need to validate endPos before using it in the selection.
if (endPos.Line < 1 || endPos.Column < 1)
{
endPos = new TextViewPosition(Math.Max(endPos.Line, 1), Math.Max(endPos.Column, 1));
}
// Don't select the text to be deleted; just reuse the ReplaceSelectionWithText logic
var sel = new SimpleSelection(textArea, startPos, endPos);
sel.ReplaceSelectionWithText(string.Empty);
}
else
{
textArea.RemoveSelectedText();
}
textArea.Caret.BringCaretToView();
args.Handled = true;
}
});
}
// Make life easier for text editor extensions that use a different cursor based on the pressed modifier keys.
/// <inheritdoc/>
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
// [DIGITALRUNE] Scroll up/down by one line with Ctrl-Up/Down.
if (!e.Handled && Keyboard.Modifiers == ModifierKeys.Control)
{
if (e.Key == Key.Up)
{
scrollInfo.LineUp();
// Keep caret within the visible area.
if (TextView.VerticalOffset + TextView.ActualHeight - TextView.DefaultLineHeight < TextView.GetVisualTopByDocumentLine(Caret.Line))
{
ClearSelection();
CaretNavigationCommandHandler.MoveCaret(this, CaretMovementType.LineUp);
}
e.Handled = true;
}
else if (e.Key == Key.Down)
{
scrollInfo.LineDown();
// Keep caret within the visible area.
if (TextView.VerticalOffset > TextView.GetVisualTopByDocumentLine(Caret.Line))
{
ClearSelection();
CaretNavigationCommandHandler.MoveCaret(this, CaretMovementType.LineDown);
}
e.Handled = true;
}
}
TextView.InvalidateCursorIfMouseWithinTextView();
}
private static ExecutedRoutedEventHandler OnDelete(CaretMovementType caretMovement)
{
return((target, args) =>
{
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
if (textArea.Selection.IsEmpty)
{
TextViewPosition startPos = textArea.Caret.Position;
bool enableVirtualSpace = textArea.Options.EnableVirtualSpace;
// When pressing delete; don't move the caret further into virtual space - instead delete the newline
if (caretMovement == CaretMovementType.CharRight)
{
enableVirtualSpace = false;
}
double desiredXPos = textArea.Caret.DesiredXPos;
TextViewPosition endPos = CaretNavigationCommandHandler.GetNewCaretPosition(
textArea.TextView, startPos, caretMovement, enableVirtualSpace, ref desiredXPos);
// GetNewCaretPosition may return (0,0) as new position,
// thus we need to validate endPos before using it in the selection.
if (endPos.Line < 1 || endPos.Column < 1)
{
endPos = new TextViewPosition(Math.Max(endPos.Line, 1), Math.Max(endPos.Column, 1));
}
// Don't select the text to be deleted; just reuse the ReplaceSelectionWithText logic
if (endPos.Column == 1)
{
var a = textArea.Document.GetLineByNumber(textArea.Caret.Line);
var b = a.PreviousLine;
if (b != null)
{
var c = b.PreviousLine;
if (b.obs != null)
{
var obs = c.obs;
var sa = textArea.Document.Text.Substring(a.Offset, a.Length + a.DelimiterLength);
var bs = textArea.Document.Text.Substring(b.Offset, b.Length + b.DelimiterLength);
var cs = textArea.Document.Text.Substring(c.Offset, c.Length + c.DelimiterLength);
textArea.Document.Remove(c.Offset + c.Length, bs.Length + sa.Length /* + c.DelimiterLength*//* + a.DelimiterLength + b.DelimiterLength*/);
textArea.Document.Insert(c.Offset + c.Length, sa);
}
else
{
var sel = new SimpleSelection(textArea, startPos, endPos);
sel.ReplaceSelectionWithText(string.Empty);
}
}
else
{
var sel = new SimpleSelection(textArea, startPos, endPos);
sel.ReplaceSelectionWithText(string.Empty);
}
}
else
{
var sel = new SimpleSelection(textArea, startPos, endPos);
sel.ReplaceSelectionWithText(string.Empty);
}
}
else
{
textArea.RemoveSelectedText();
}
}
textArea.Caret.BringCaretToView();
args.Handled = true;
});
}
