c# 颜色选择控件的实现代码

参考ColorComboBox做修改，并对颜色名做些修正，用于CR MVMixer产品中，聊作备忘~

效果图：

代码：

//颜色拾取框
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace CRMVMixer
{
   //event handler delegate
   public delegate void ColorChangedHandler(object sender, ColorChangeArgs e);

[ToolboxBitmap(typeof(ComboBox))]
   public class ColorComboBox : ComboBox
   {
       private PopupWindow popupWnd;
       private ColorPopup colors = new ColorPopup();
       private Color selectedColor = Color.Black;
       private Timer timer = new Timer();
       public event ColorChangedHandler ColorChanged;

//constructor...
       public ColorComboBox()
           : this(Color.Black)
       {
       }

public ColorComboBox(Color selectedColor)
       {
           this.SuspendLayout();
           //
           // ColorCombo
           //
           this.AutoSize = false;
           this.Size = new Size(92, 22);
           this.Text = string.Empty;
           this.DrawMode = DrawMode.OwnerDrawFixed;
           this.DropDownStyle = ComboBoxStyle.DropDownList;
           this.ItemHeight = 16;

timer.Tick += new EventHandler(OnCheckStatus);
           timer.Interval = 50;
           timer.Start();
           colors.SelectedColor = this.selectedColor = selectedColor;
           this.ResumeLayout(false);
       }

[DefaultValue(typeof(Color), "Black")]
       public Color SelectedColor
       {
           get { return selectedColor; }
           set
           {
               selectedColor = value;
               colors.SelectedColor = value;
               Invalidate();
           }
       }

protected override void WndProc(ref Message m)
       {
           //256: WM_KEYDOWN, 513: WM_LBUTTONDOWN, 515: WM_LBUTTONDBLCLK
           if (m.Msg == 256 || m.Msg == 513 || m.Msg == 515)
           {
               if (m.Msg == 513)
                   PopupColorPalette();
               return;
           }
           base.WndProc(ref   m);
       }

private void PopupColorPalette()
       {
           //create a popup window
           popupWnd = new PopupWindow(colors);

//calculate its position in screen coordinates
           Rectangle rect = Bounds;
           rect = this.Parent.RectangleToScreen(rect);
           Point pt = new Point(rect.Left, rect.Bottom);

//tell it that we want the ColorChanged event
           popupWnd.ColorChanged += new ColorChangedHandler(OnColorChanged);

//show the popup
           popupWnd.Show(pt);
           //disable the button so that the user can't click it
           //while the popup is being displayed
           this.Enabled = false;
           this.timer.Start();
       }

//event handler for the color change event from the popup window
       //simply relay the event to the parent control
       protected void OnColorChanged(object sender, ColorChangeArgs e)
       {
           //if a someone wants the event, and the color has actually changed
           //call the event handler
           if (ColorChanged != null && e.color != this.selectedColor)
           {
               this.selectedColor = e.color;
               ColorChanged(this, e);
           }
           else //otherwise simply make note of the new color
               this.selectedColor = e.color;
       }

protected override void OnDrawItem(DrawItemEventArgs e)
       {
           var g = e.Graphics;
           e.DrawBackground();
           var brush = new SolidBrush(this.selectedColor);
           var rect = e.Bounds;
           rect.Width -= 1;
           rect.Height -= 1;
           g.FillRectangle(brush, rect);
           g.DrawRectangle(Pens.Black, rect);
           e.DrawFocusRectangle();
       }

//This is the timer call back function. It checks to see
       //if the popup went from a visible state to an close state
       //if so then it will uncheck and enable the button
       private void OnCheckStatus(object sender, EventArgs e)
       {
           if (popupWnd != null && !popupWnd.Visible)
           {
               this.timer.Stop();
               this.Enabled = true;
           }
       }

/// <summary>
       /// a button style radio button that shows a color
       /// </summary>
       private class ColorRadioButton : RadioButton
       {
           public ColorRadioButton(Color color, Color backColor)
           {
               this.ClientSize = new Size(21, 21);
               this.Appearance = Appearance.Button;
               this.Name = "button";
               this.Visible = true;
               this.ForeColor = color;
               this.FlatAppearance.BorderColor = backColor;
               this.FlatAppearance.BorderSize = 0;
               this.FlatStyle = FlatStyle.Flat;
               this.Paint += new PaintEventHandler(OnPaintButton);
           }

private void OnPaintButton(object sender, PaintEventArgs e)
           {
               //paint a square on the face of the button using the controls foreground color
               Rectangle colorRect = new Rectangle(ClientRectangle.Left + 5, ClientRectangle.Top + 5, ClientRectangle.Width - 9, ClientRectangle.Height - 9);
               e.Graphics.FillRectangle(new SolidBrush(this.ForeColor), colorRect);
               e.Graphics.DrawRectangle(Pens.DarkGray, colorRect);
           }
       }

///<summary>
       ///this is the popup window.  This window will be the parent of the
       ///window with the color controls on it
       ///</summary>
       private class PopupWindow : ToolStripDropDown
       {
           public event ColorChangedHandler ColorChanged;
           private ToolStripControlHost host;
           private ColorPopup content;

public Color SelectedColor
           {
               get { return content.SelectedColor; }
           }

public PopupWindow(ColorPopup content)
           {
               if (content == null)
                   throw new ArgumentNullException("content");

this.content = content;
               this.AutoSize = false;
               this.DoubleBuffered = true;
               this.ResizeRedraw = true;
               //create a host that will host the content
               host = new ToolStripControlHost(content);

this.Padding = Margin = host.Padding = host.Margin = Padding.Empty;
               this.MinimumSize = content.MinimumSize;
               content.MinimumSize = content.Size;
               MaximumSize = new Size(content.Size.Width + 1, content.Size.Height + 1);
               content.MaximumSize = new Size(content.Size.Width + 1, content.Size.Height + 1);
               Size = new Size(content.Size.Width + 1, content.Size.Height + 1);

content.Location = Point.Empty;
               //add the host to the list
               Items.Add(host);
           }

protected override void OnClosed(ToolStripDropDownClosedEventArgs e)
           {
               //when the window close tell the parent that the color changed
               if (ColorChanged != null)
                   ColorChanged(this, new ColorChangeArgs(this.SelectedColor));
           }
       }

///<summary>
       ///this class represends the control that has all the color radio buttons.
       ///this control gets embedded into the PopupWindow class.
       ///</summary>
       private class ColorPopup : UserControl
       {
           //private Color[] colors = { Color.Black, Color.Gray, Color.Maroon, Color.Olive, Color.Green, Color.Teal, Color.Navy, Color.Purple, Color.White, Color.Silver, Color.Red, Color.Yellow, Color.Lime, Color.Aqua, Color.Blue, Color.Fuchsia };
           private Color[] colors = {
               Color.Black, Color.Navy, Color.DarkGreen, Color.DarkCyan, Color.DarkRed, Color.DarkMagenta, Color.Olive,
               Color.LightGray, Color.DarkGray, Color.Blue, Color.Lime, Color.Cyan, Color.Red, Color.Fuchsia,
               Color.Yellow, Color.White, Color.RoyalBlue, Color.MediumBlue,  Color.LightGreen, Color.MediumSpringGreen, Color.Chocolate,
               Color.Pink, Color.Khaki, Color.WhiteSmoke, Color.BlueViolet, Color.DeepSkyBlue, Color.OliveDrab, Color.SteelBlue,
               Color.DarkOrange, Color.Tomato, Color.HotPink, Color.DimGray,
           };
           private string[] colorNames = {
               "黑色", "藏青", "深绿", "深青", "红褐", "洋红", "褐绿",
               "浅灰", "灰色", "蓝色", "绿色", "青色", "红色", "紫红",
               "黄色", "白色", "蓝灰", "藏蓝", "淡绿", "青绿", "黄褐",
               "粉红", "嫩黄", "银白", "紫色", "天蓝", "灰绿", "青蓝",
               "橙黄", "桃红", "英红", "深灰"
           };
           private ToolTip toolTip = new ToolTip();
           private ColorRadioButton[] buttons;
           private Button moreColorsBtn;
           private Color selectedColor = Color.Black;

///<summary>
           ///get or set the selected color
           ///</summary>
           public Color SelectedColor
           {
               get { return selectedColor; }
               set
               {
                   selectedColor = value;
                   Color[] colors = this.colors;
                   for (int i = 0; i < colors.Length; i++)
                       buttons[i].Checked = selectedColor == colors[i];
               }
           }

private void InitializeComponent()
           {
               this.SuspendLayout();
               this.Name = "Color Popup";
               this.Text = string.Empty;
               this.ResumeLayout(false);
           }

public ColorPopup()
           {
               InitializeComponent();

SetupButtons();
               this.Paint += new PaintEventHandler(OnPaintBorder);
           }

//place the buttons on the window.
           private void SetupButtons()
           {
               Controls.Clear();

int x = 1;
               int y = 2;
               int breakCount = 7;
               Color[] colors = this.colors;
               this.buttons = new ColorRadioButton[colors.Length];
               this.ClientSize = new Size(139, 137);
               //color buttons
               for (int i = 0; i < colors.Length; i++)
               {
                   if (i > 0 && i ％ breakCount == 0)
                   {
                       y += 19;
                       x = 1;
                   }
                   buttons[i] = new ColorRadioButton(colors[i], this.BackColor);
                   buttons[i].Location = new Point(x, y);
                   toolTip.SetToolTip(buttons[i], colorNames[i]);
                   Controls.Add(buttons[i]);
                   buttons[i].Click += new EventHandler(BtnClicked);
                   if (selectedColor == colors[i])
                       buttons[i].Checked = true;
                   x += 19;
               }

//line...
               y += 24;
               var label = new Label();
               label.AutoSize = false;
               label.Text = string.Empty;
               label.Width = this.Width - 5;
               label.Height = 2;
               label.BorderStyle = BorderStyle.Fixed3D;
               label.Location = new Point(4, y);
               Controls.Add(label);

//button
               y += 7;
               moreColorsBtn = new Button();
               moreColorsBtn.FlatStyle = FlatStyle.Popup;
               moreColorsBtn.Text = "其它颜色...";
               moreColorsBtn.Location = new Point(6, y);
               moreColorsBtn.ClientSize = new Size(127, 23);
               moreColorsBtn.Click += new EventHandler(OnMoreClicked);
               Controls.Add(moreColorsBtn);
           }

private void OnPaintBorder(object sender, PaintEventArgs e)
           {
               var rect = this.ClientRectangle;
               rect.Width -= 1;
               rect.Height -= 1;
               e.Graphics.DrawRectangle(new Pen(SystemColors.WindowFrame), rect);
           }

public void BtnClicked(object sender, EventArgs e)
           {
               selectedColor = ((ColorRadioButton)sender).ForeColor;
               ((ToolStripDropDown)Parent).Close();
           }

public void OnMoreClicked(object sender, EventArgs e)
           {
               ColorDialog dlg = new ColorDialog();
               dlg.Color = SelectedColor;
               if (dlg.ShowDialog(this) == DialogResult.OK)
                   selectedColor = dlg.Color;
               ((ToolStripDropDown)Parent).Close();
           }
       }
   }

//define the color changed event argument
   public class ColorChangeArgs : System.EventArgs
   {
       //the selected color
       public Color color;
       public ColorChangeArgs(Color color)
       {
           this.color = color;
       }
   }
}

来源：https://www.cnblogs.com/crwy/p/14673041.html