public void AdjustDecimals(TextBox textbox)
{
var textStatus = new NumericalTextStatus(textbox.Text);
// 小数部を持っているか
if (Decimals > 0)
{
if (!textStatus.HasDecimal || textStatus.DecimalPartText.Length != Decimals)
{
var newText = textStatus.SetDecimals(Decimals);
textbox.Text = newText;
}
}
}
private void Input(TextBox textbox, Key key, ref bool isHandled)
{
if (textbox == null)
{
return;
}
var oldText = textbox.Text;
var newText = "";
// 例外
if (key == Key.Enter)
{
return;
}
else if (key == Key.Tab)
{
MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
return;
}
else if (key == Key.Left || key == Key.Right)
{
return;
}
else if (key == Key.OemPeriod || key == Key.Decimal)
{
var decimalSelectionStart = Text.IndexOf('.');
if (decimalSelectionStart > 0)
{
textbox.SelectionStart = decimalSelectionStart + 1;
}
isHandled = true; // .は 2重に入力できない
return;
}
var selectionStart = textbox.SelectionStart;
var textStatus = new NumericalTextStatus(Text);
if (key == Key.Delete)
{
newText = textStatus.Delete(selectionStart);
textbox.Text = newText;
textbox.SelectionStart = selectionStart;
}
else if (key == Key.Back)
{
if (selectionStart > 0)
{
selectionStart -= 1;
}
newText = textStatus.Delete(selectionStart);
textbox.Text = newText;
textbox.SelectionStart = selectionStart;
}
else
{
// キーの数値入力を取得する
var keyValue = GetKeyValue(key);
if (keyValue < 0)
{
isHandled = true;
return;
}
newText = textStatus.InsertOrReplace(keyValue, selectionStart);
textbox.Text = newText;
if (newText.Length != oldText.Length)
{
textbox.SelectionStart = selectionStart + 1;
}
else
{
if (textStatus.IndexOfDecimal + 1 <= selectionStart)
{
textbox.SelectionStart = selectionStart + 1;
}
else
{
textbox.SelectionStart = selectionStart;
}
}
}
isHandled = true;
}
/*
* private SimpleCommand _DeleteCommand;
*
* public SimpleCommand DeleteCommand
* {
* get
* {
* return _DeleteCommand = _DeleteCommand ?? new SimpleCommand(() =>
* {
* Debug.WriteLine($"{nameof(DeleteCommand)} Called.");
* });
* }
* }
*/
#endregion
public FixedDecimalPointTextBox()
{
CommandManager.AddPreviewExecutedHandler(this, (sender, e) =>
{
if (e.Command == ApplicationCommands.Paste || e.Command == ApplicationCommands.Cut)
{
e.Handled = true;
}
});
// InputBindings.Add(new KeyBinding(DeleteCommand, Key.Delete, ModifierKeys.None));
FocusManager.SetFocusedElement(this, null);
SelectionChanged += (sender, e) =>
{
// Console.WriteLine($"\"{nameof(SelectionChanged)}\" event has occurred. {DateTime.Now}");
var textbox = e.Source as TextBox;
if (textbox == null)
{
return;
}
if (textbox.SelectionLength != 0)
{
textbox.SelectionLength = 0;
e.Handled = true;
}
};
PreviewMouseDown += (sender, e) =>
{
Console.WriteLine($"\"{nameof(PreviewMouseDown)}\" event has occurred. {DateTime.Now}");
var textbox = e.Source as TextBox;
if (textbox == null)
{
return;
}
textbox.Focus();
// マウスの選択位置にキャレットが移動するのを GotFocus で指定した位置に固定する
e.Handled = true;
};
GotFocus += (sender, e) =>
{
Console.WriteLine($"\"{nameof(GotFocus)}\" event has occurred. {DateTime.Now}");
var textbox = e.Source as TextBox;
if (textbox == null)
{
return;
}
var textStatus = new NumericalTextStatus(textbox.Text);
if (textStatus.HasDecimal)
{
textbox.SelectionStart = textStatus.IndexOfDecimal;
}
else
{
textbox.SelectionStart = textStatus.Length;
}
};
PreviewKeyDown += (sender, e) =>
{
Console.WriteLine($"\"{nameof(PreviewKeyDown)}\" event has occurred. {DateTime.Now}");
var textbox = e.Source as TextBox;
var isHandled = false;
Input(textbox, e.Key, ref isHandled);
e.Handled = isHandled;
};
TextChanged += (sender, e) =>
{
var textbox = e.Source as TextBox;
if (textbox == null)
{
return;
}
AdjustDecimals(textbox);
};
}
