private async void SetColorbar(int imageID)
        {
            if (_imageID != -1)
            {
                List <Model.ImageColorInfo> lst = await SqliteUtil.Current.QueryImageColorInfoByImageID(_imageID);

                foreach (ImageColorInfo color in lst)
                {
                    BoxView box = new BoxView();
                    box.Color        = Xamarin.Forms.Color.FromHex(color.HEXValue);
                    box.CornerRadius = new CornerRadius(10);
                    pickColorList.Children.Add(box);
                }

                if (lst.Count > 0)
                {
                    ColorCode colorcd = new ColorCode();
                    string    hex     = lst[lst.Count - 1].HEXValue;
                    btnColor.BackgroundColor = Xamarin.Forms.Color.FromHex(hex);
                    lblSelected.Text         = hex;
                    lblHex.Text = hex;

                    Rgb rgb = colorcd.getRgb(hex);
                    lblRgb.Text     = colorcd.getRgbString(rgb);
                    lblHsl.Text     = colorcd.getHslString(rgb);
                    lblHsv.Text     = colorcd.getHsvString(rgb);
                    lblCmyk.Text    = colorcd.getCmykString(rgb);
                    lblLab.Text     = colorcd.getLabString(rgb);
                    lblMunsell.Text = colorcd.getMunsellString(rgb);
                    lblPccs.Text    = colorcd.getPCCSTone(rgb);
                    lblJis.Text     = JisUtil.getJisByMunsell(lblMunsell.Text);
                }
            }
        }
        /// <summary>
        /// 選択した色リストを更新する
        /// </summary>
        /// <param name="lst"></param>
        private void updatecolorBar(List <ImageColorInfo> lst, string pickColor = "")
        {
            pickColorList.Children.Clear();

            int    colorcnt    = lst.Count;
            double heightValue = pickColorList.Width / 10;

            ColorCode colorcd = new ColorCode();

            foreach (ImageColorInfo color in lst)
            {
                BoxView box = new BoxView();
                box.BackgroundColor = Xamarin.Forms.Color.FromHex(color.HEXValue);
                box.Color           = Xamarin.Forms.Color.FromHex(color.HEXValue);
                double widthHeight = pickColorList.Width / colorcnt;
                box.WidthRequest  = widthHeight;
                box.HeightRequest = heightValue;

                if (lblSelected.Text.Equals(color.HEXValue))
                {
                    box.HeightRequest = heightValue * 2;
                    box.Margin        = new Thickness(0, 0, 0, -heightValue);
                }
                var tapGestureRecognizer = new TapGestureRecognizer();
                tapGestureRecognizer.Tapped += (s, e) =>
                {
                    foreach (BoxView newBox in pickColorList.Children)
                    {
                        newBox.HeightRequest = heightValue;
                        newBox.Margin        = 0;
                    }
                    BoxView boxview = (BoxView)s;
                    boxview.HeightRequest    = heightValue * 2;
                    boxview.Margin           = new Thickness(0, 0, 0, -heightValue);
                    btnColor.BackgroundColor = boxview.Color;

                    lblSelected.Text = ToHex(boxview.BackgroundColor.ToSKColor());

                    string hex = ToHex(boxview.BackgroundColor.ToSKColor());
                    lblHex.Text = hex;
                    Rgb rgb = colorcd.getRgb(hex);
                    lblRgb.Text     = colorcd.getRgbString(rgb);
                    lblHsl.Text     = colorcd.getHslString(rgb);
                    lblHsv.Text     = colorcd.getHsvString(rgb);
                    lblCmyk.Text    = colorcd.getCmykString(rgb);
                    lblLab.Text     = colorcd.getLabString(rgb);
                    lblMunsell.Text = colorcd.getMunsellString(rgb);
                    lblPccs.Text    = colorcd.getPCCSTone(rgb);
                    lblJis.Text     = JisUtil.getJisByMunsell(lblMunsell.Text);
                };
                box.GestureRecognizers.Add(tapGestureRecognizer);

                pickColorList.Children.Add(box);
            }
        }
        private void btn_Delete_Click(object sender, EventArgs e)
        {
            string    strHex  = lblSelected.Text;
            ColorCode colorcd = new ColorCode();

            foreach (ImageColorInfo info in qList)
            {
                if (info.HEXValue.Equals(strHex))
                {
                    qList.Remove(info);
                    break;
                }
            }
            _point    = new Xamarin.Forms.Point(0.0, 0.0);
            lastXMove = lastXMoveBak;
            lastYMove = lastYMoveBak;
            if (qList.Count > 0)
            {
                string hex = qList[qList.Count - 1].HEXValue;
                btnColor.BackgroundColor = Xamarin.Forms.Color.FromHex(hex);
                lblSelected.Text         = hex;
                lblHex.Text = hex;
                Rgb rgb = colorcd.getRgb(hex);
                lblRgb.Text     = colorcd.getRgbString(rgb);
                lblHsl.Text     = colorcd.getHslString(rgb);
                lblHsv.Text     = colorcd.getHsvString(rgb);
                lblCmyk.Text    = colorcd.getCmykString(rgb);
                lblLab.Text     = colorcd.getLabString(rgb);
                lblMunsell.Text = colorcd.getMunsellString(rgb);
                lblPccs.Text    = colorcd.getPCCSTone(rgb);
                lblJis.Text     = JisUtil.getJisByMunsell(lblMunsell.Text);
            }
            else
            {
                btnColor.BackgroundColor = Xamarin.Forms.Color.White;
                lblSelected.Text         = string.Empty;
                lblHex.Text     = string.Empty;
                lblRgb.Text     = string.Empty;
                lblHsl.Text     = string.Empty;
                lblHsv.Text     = string.Empty;
                lblCmyk.Text    = string.Empty;
                lblLab.Text     = string.Empty;
                lblMunsell.Text = string.Empty;
                lblPccs.Text    = string.Empty;
                lblJis.Text     = string.Empty;
            }

            // カンバス更新
            canvasView.InvalidateSurface();
        }
        public void reload()
        {
            ColorCode colorcd = new ColorCode();

            if (qList.Count > 0)
            {
                string hex = qList[qList.Count - 1].HEXValue;
                btnColor.BackgroundColor = Xamarin.Forms.Color.FromHex(hex);
                lblSelected.Text         = hex;
                lblHex.Text = hex;

                Rgb rgb = colorcd.getRgb(hex);
                lblRgb.Text     = colorcd.getRgbString(rgb);
                lblHsl.Text     = colorcd.getHslString(rgb);
                lblHsv.Text     = colorcd.getHsvString(rgb);
                lblCmyk.Text    = colorcd.getCmykString(rgb);
                lblLab.Text     = colorcd.getLabString(rgb);
                lblMunsell.Text = colorcd.getMunsellString(rgb);
                lblPccs.Text    = colorcd.getPCCSTone(rgb);
                lblJis.Text     = JisUtil.getJisByMunsell(lblMunsell.Text);
            }
            else
            {
                btnColor.BackgroundColor = Xamarin.Forms.Color.White;
                lblSelected.Text         = string.Empty;
                lblHex.Text     = string.Empty;
                lblRgb.Text     = string.Empty;
                lblHsl.Text     = string.Empty;
                lblHsv.Text     = string.Empty;
                lblCmyk.Text    = string.Empty;
                lblLab.Text     = string.Empty;
                lblMunsell.Text = string.Empty;
                lblPccs.Text    = string.Empty;
                lblJis.Text     = string.Empty;
            }

            // カンバス更新
            canvasView.InvalidateSurface();
        }