OpenTween.FilterDialog.ButtonDown_Click C# (CSharp) Method

        private void ButtonDown_Click(object sender, EventArgs e)
        {
            if (this.ListTabs.SelectedIndex == -1 || this.ListTabs.SelectedIndex == this.ListTabs.Items.Count - 1)
                return;

            var selectedTabName = (string)this.ListTabs.SelectedItem;
            var selectedTab = this._sts.Tabs[selectedTabName];

            var targetTabName = (string)this.ListTabs.Items[this.ListTabs.SelectedIndex + 1];
            var targetTab = this._sts.Tabs[targetTabName];

            // ミュートタブは移動禁止
            if (selectedTab.TabType == MyCommon.TabUsageType.Mute || targetTab.TabType == MyCommon.TabUsageType.Mute)
                return;

            var tweenMain = (TweenMain)this.Owner;
            tweenMain.ReOrderTab(selectedTabName, targetTabName, false);

            // ListTab のアイテム並び替え
            // 選択が解除されてしまうのを防ぐため SelectedIndex のアイテムは操作せず前後のアイテムを移動する
            var idx = this.ListTabs.SelectedIndex;
            this.ListTabs.Items.RemoveAt(idx + 1);
            this.ListTabs.Items.Insert(idx, targetTabName);
        }