OpenTween.TweenMain.ProcessDialogKey C# (CSharp) Method

        protected override bool ProcessDialogKey(Keys keyData)
        {
            //TextBox1でEnterを押してもビープ音が鳴らないようにする
            if ((keyData & Keys.KeyCode) == Keys.Enter)
            {
                if (StatusText.Focused)
                {
                    bool _NewLine = false;
                    bool _Post = false;

                    if (this._cfgCommon.PostCtrlEnter) //Ctrl+Enter投稿時
                    {
                        if (StatusText.Multiline)
                        {
                            if ((keyData & Keys.Shift) == Keys.Shift && (keyData & Keys.Control) != Keys.Control) _NewLine = true;

                            if ((keyData & Keys.Control) == Keys.Control) _Post = true;
                        }
                        else
                        {
                            if (((keyData & Keys.Control) == Keys.Control)) _Post = true;
                        }

                    }
                    else if (this._cfgCommon.PostShiftEnter) //SHift+Enter投稿時
                    {
                        if (StatusText.Multiline)
                        {
                            if ((keyData & Keys.Control) == Keys.Control && (keyData & Keys.Shift) != Keys.Shift) _NewLine = true;

                            if ((keyData & Keys.Shift) == Keys.Shift) _Post = true;
                        }
                        else
                        {
                            if (((keyData & Keys.Shift) == Keys.Shift)) _Post = true;
                        }

                    }
                    else //Enter投稿時
                    {
                        if (StatusText.Multiline)
                        {
                            if ((keyData & Keys.Shift) == Keys.Shift && (keyData & Keys.Control) != Keys.Control) _NewLine = true;

                            if (((keyData & Keys.Control) != Keys.Control && (keyData & Keys.Shift) != Keys.Shift) ||
                                ((keyData & Keys.Control) == Keys.Control && (keyData & Keys.Shift) == Keys.Shift)) _Post = true;
                        }
                        else
                        {
                            if (((keyData & Keys.Shift) == Keys.Shift) ||
                                (((keyData & Keys.Control) != Keys.Control) &&
                                ((keyData & Keys.Shift) != Keys.Shift))) _Post = true;
                        }
                    }

                    if (_NewLine)
                    {
                        int pos1 = StatusText.SelectionStart;
                        if (StatusText.SelectionLength > 0)
                        {
                            StatusText.Text = StatusText.Text.Remove(pos1, StatusText.SelectionLength);  //選択状態文字列削除
                        }
                        StatusText.Text = StatusText.Text.Insert(pos1, Environment.NewLine);  //改行挿入
                        StatusText.SelectionStart = pos1 + Environment.NewLine.Length;    //カーソルを改行の次の文字へ移動
                        return true;
                    }
                    else if (_Post)
                    {
                        PostButton_Click(null, null);
                        return true;
                    }
                }
                else if (_statuses.Tabs[ListTab.SelectedTab.Text].TabType == MyCommon.TabUsageType.PublicSearch &&
                         (ListTab.SelectedTab.Controls["panelSearch"].Controls["comboSearch"].Focused ||
                         ListTab.SelectedTab.Controls["panelSearch"].Controls["comboLang"].Focused))
                {
                    this.SearchButton_Click(ListTab.SelectedTab.Controls["panelSearch"].Controls["comboSearch"], null);
                    return true;
                }
            }

            return base.ProcessDialogKey(keyData);
        }