/// <summary>
/// 項目ラベルマウスダウン時の処理
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnItemLabelMouseDown(object sender, MouseEventArgs e)
{
Label label = sender as Label;
TechLabelInfo info = label?.Tag as TechLabelInfo;
if (info == null)
{
return;
}
// ドラッグアンドドロップの開始準備
if (AllowDragDrop)
{
// 左ボタンダウンでなければドラッグ状態を解除する
if (e.Button != MouseButtons.Left)
{
_dragPoint = Point.Empty;
Cursor.Current = Cursors.Default;
return;
}
// ドラッグ開始位置を設定する
_dragPoint = new Point(label.Left + e.X, label.Top + e.Y);
}
// イベントハンドラを呼び出す
ItemMouseDown?.Invoke(sender, new ItemMouseEventArgs(info.Item, info.Position, e));
}
/// <summary>
/// The coordinates are in legend coordinates, but a LegendBox is provided to define the
/// coordinates of the specified object.
/// </summary>
/// <param name="e">An ItemMouseEventArgs</param>
protected virtual void OnItemMouseDown(ItemMouseEventArgs e)
{
ItemMouseDown?.Invoke(this, e);
}