一、 设计一个弹出窗口基类。

    1、通过继承窗体类创建基类。

public class ColorCommonForm : System.Windows.Forms.Form
   2、创建虚拟方法 Show 来指定窗体位置。

        /**//// <summary>
        /// 自己定义的 show
        /// </summary>
        /// <param name="Ctl">要在那个控件附近 show 出本窗口</param>
        public virtual void Show(Control Ctl)
        ...{
            Rectangle rect = Ctl.RectangleToScreen(new Rectangle(0, 0, Ctl.Width, Ctl.Height));
            this.Left = rect.Left;
            this.Top = rect.Top + Ctl.Height;
            Rectangle ScreenRect = Screen.PrimaryScreen.WorkingArea;
            if (this.Right > ScreenRect.Width || this.Bottom > ScreenRect.Height)
            ...{
                this.Left = rect.Left - this.Width + Ctl.Width;
                this.Top = rect.Top - this.Height;
            }
            this.Show();
        }
     3、重写 WndProc（窗体消息）

        /**//// <summary>
        /// 重写 WndProc
        /// </summary>
        /// <param name="m"></param>
        protected override void WndProc(ref Message m)
        ...{
            //如果整个程序失去就隐藏
            if (m.Msg == SystemShell.WM_ACTIVATEAPP && m.WParam == IntPtr.Zero)
            ...{
                this.Hide();
            }
            base.WndProc(ref m);
        }
 

二、设计颜色弹出窗口，并把颜色绘制到窗口上。

      1、定义需要绘制到窗体的颜色。

        private static string[] colorList =
                ...{
            "#000000","#973302","#343200","#013300","#003466","#000083","#313398","#333333","#810004",
            "#FD6802","#858200","#008002","#008081","#0201FF","#69669D","#80807E","#FE0002","#FE9B00",
            "#9ACB00","#339A65","#33CBCC","#3C62FF","#780179","#99999B","#FF00FE","#FFCB03","#FFFE01",
            "#00FF01","#01FFFF","#00CCFF","#993365","#C0C0C0","#FF99CB","#FFCA9B","#FFFE99","#CDFFCC",
            "#CDFFFF","#99CDFD","#C89CFB","#FFFFFF"
        };
       2、绘制颜色到窗体的画布

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        ...{
            int x = 5, y = 5, count = 1;
            using (SolidBrush MyBrush1 = new SolidBrush(Color.Black))
            ...{
                Rectangle r1 = new Rectangle(x, y, 130, 12);
                e.Graphics.DrawRectangle(new Pen(Color.FromArgb(172, 168, 153)), x, y, 12, 12);
                e.Graphics.FillRectangle(MyBrush1, x, y, 12, 12);
                Point p = new Point(x + 50, y - 1);
                Font drawFont = new Font("Arial", 8);
                e.Graphics.DrawString("自动", drawFont, MyBrush1, p);
                y += 20;
                for (int i = 0; i < colorList.Length; i++)
                ...{
                    if (count < 8)
                    ...{
                        SolidBrush MyBrush = new SolidBrush(ColorTranslator.FromHtml(colorList[i].ToString()));
                        e.Graphics.DrawRectangle(new Pen(Color.FromArgb(172, 168, 153)), x, y, 12, 12);
                        Rectangle r = new Rectangle(x, y, 12, 12);
                        count = i + 1;
                        allRec.SetValue(r, i);
                        e.Graphics.FillRectangle(MyBrush, x, y, 12, 12);
                        x += 17;
                    }
                    else
                    ...{
                        int row = count / 8 + 1;   //
                        if (count % 8 == 0)
                        ...{
                            x = 5;
                            if (row == 0)
                            ...{
                                y = 43;
                            }
                            else
                            ...{
                                y = 17 * row + 8;
                            }
                        }
                        SolidBrush MyBrush = new SolidBrush(ColorTranslator.FromHtml(colorList[i].ToString()));
                        Rectangle r = new Rectangle(x, y, 12, 12);
                        e.Graphics.DrawRectangle(new Pen(Color.FromArgb(172, 168, 153)), r);
                        count = i + 1;
                        allRec.SetValue(r, i);
                        e.Graphics.FillRectangle(MyBrush, x, y, 12, 12);
                        x += 17;
                    }
                }
                allRec.SetValue(r1, 40);
            }
        }
       3、定义鼠标移动选择颜色（移动到颜色上产生提示）

        /**//// 如果鼠标进入 (更多) 的范围将 label1背景改变
        private void ColorSelectForm_MouseMove(object sender, MouseEventArgs e)
        ...{
            Point pt = Control.MousePosition;
            Color cl = Color.FromArgb(247, 246, 241);
            if (!(pt.X > this.Right || pt.X < this.Left || pt.Y > this.Bottom || pt.Y < this.Top))
            ...{
                Rectangle rect = label1.RectangleToScreen(new Rectangle(0, 0, label1.Width, label1.Height));
                if (!(pt.X > rect.Right || pt.X < rect.X || pt.Y > rect.Bottom || pt.Y < rect.Y))
                ...{
                    cl = Color.FromArgb(214, 238, 252);
                }
                else
                ...{
                    using (Graphics g = this.pictureBox1.CreateGraphics())
                    ...{
                        Point p = new Point(e.X, e.Y);
                        for (int i = 0; i < allRec.Length; i++)
                        ...{
                            if (allRec[i].Contains(p))
                            ...{
                                this.pictureBox1.Cursor = Cursors.Arrow;
                                if (i == 40)
                                ...{
                                    tempColor = ColorTranslator.FromHtml("#000000");
                                }
                                else
                                ...{
                                    tempColor = ColorTranslator.FromHtml(colorList[i]);
                                }
                                g.DrawRectangle(pen, allRec[i]);
                                return;
                            }
                            else
                            ...{
                                if (i != 40)
                                ...{
                                    g.DrawRectangle(new Pen(Color.FromArgb(172, 168, 153)), allRec[i]);
                                }
                                else
                                ...{
                                    g.DrawRectangle(new Pen(Color.FromArgb(246, 246, 246)), 5, 5, 130, 12);
                                }
                            }
                        }
                    }
                }
            }
            label1.BackColor = cl;
        }
      4、鼠标按下选择颜色事件

        /**//// 如果鼠标按下进行一系列处理
        private void ColorSelectForm_MouseDown(object sender, MouseEventArgs e)
        ...{
            this.Capture = false;  //释放鼠标
            Point pt = Control.MousePosition;
            Color cl = Color.Empty;
            while (true)
            ...{
                if (!(pt.X > this.Right || pt.X < this.Left || pt.Y > this.Bottom || pt.Y < this.Top))//是否在窗口范围内
                ...{
                    Rectangle rect = label1.RectangleToScreen(new Rectangle(0, 0, label1.Width, label1.Height));
                    if (!(pt.X > rect.Right || pt.X < rect.X || pt.Y > rect.Bottom || pt.Y < rect.Y))//如果鼠标点击在(更多)上弹出 colorDialog1
                    ...{
                        if (colorDialog1.ShowDialog() == DialogResult.OK)
                        ...{
                            cl = colorDialog1.Color;
                        }
                        break;
                    }
                    rect = pictureBox1.RectangleToScreen(new Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));
                    if (!(pt.X > rect.Right || pt.X < rect.X || pt.Y > rect.Bottom || pt.Y < rect.Y))//判断鼠标是否点击到了 pictureBox1
                    ...{
                        if (this.Cursor == Cursors.Arrow)
                        ...{
                            cl = tempColor;
                        }
                    }

                }
                break;
            }
            if (SelectColor != null && cl != Color.Empty)
            ...{
                SelectColor(cl);
            }
            this.Dispose();
        }
三、通过继承 ComboBox 设计类似 WORD 下拉选框。

    1、构造颜色下拉控件

            this.Cursor = Cursors.Hand;
            this.ItemHeight = 16;
            this.BackColor = System.Drawing.Color.Green;
            this.DropDownHeight = 1;
            this.DropDownWidth = 1;
            this.DrawMode = DrawMode.OwnerDrawFixed;    //指定控件元素为自定义绘制
     2、定义控件的单击事件,弹出颜色框

        protected override void OnClick(EventArgs e)
        ...{
            ColorBoxForm a = new ColorBoxForm();
            a.SelectColor += new ColorBoxForm.MouseSelectColor(ColorForm_SelectColor);  //代码中省略了命名空间
            a.Show(this);
            base.OnClick(e);
        }
    3、自定义绘制下拉元素（可省略）

        protected override void OnDrawItem(DrawItemEventArgs e)
        ...{
            base.OnDrawItem(e);
        }
    以上控件制作完成，得到效果如下：