C#皮肤－DateTimePicker 控件实现 - 苏飞论坛

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下面我们一起来看看是怎么样实现的

这个暂时实现的比较简单一些，我只是给他加了一个外衣，其它的基本没有动，就是现在看到的效果，点开之后是和系统是控件DateTimePicker一个样子，呵呵    所以我在这里就不在多说什么了，实现的很不进如人意，我会慢慢更新的，在这里只是先把代码放在这里，大家感觉那里不合适的可以帮助我改动一下，感谢

1.怎么样实现的上图效果
[code=csharp]public void ResetBitmap()
      {
         this.NormalImage = Shared.NomalDrawButton;
         this.MouseDownImage = Shared.MouseDownDrawButton;
         this.MouseMoveImage = Shared.MouseMoveDrawButton;
      }

      protected override void OnValueChanged(EventArgs eventargs)
      {
         base.OnValueChanged(eventargs);
         this.Invalidate();
      }  private void OverrideDropDown(Graphics g)
      {
         //if (!this.ShowUpDown)
         //{
         Rectangle rect = new Rectangle(this.Width - DropDownButtonWidth, 0, DropDownButtonWidth, this.Height);
         //ControlPaint.DrawComboButton(g, rect, ButtonState.Flat);
         //}
         g.FillRectangle(new SolidBrush(Color.White), rect);

         if (this.Enabled)
         {
            if (_mouseEnter)
            {
                  g.DrawImage(this.MouseMoveImage, new Rectangle(this.Width - 20, 3, 16, 16));
            }
            else
            {
                  g.DrawImage(this.NormalImage, new Rectangle(this.Width - 20, 3, 16, 16));
            }
         }
         else
         {
            g.DrawImage(Shared.NotEnableDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));
         }
      }[/code]

2.时间和日期绘制
..................
3.几个常用事件的处理
..................

下面是程序所有代码

[code=csharp]using System;
using System.Collections.Generic;

using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Drawing;
using CRD.Common;

namespace CRD.WinUI.Misc
{
public class DateTimePicker : System.Windows.Forms.DateTimePicker
{
      private Image _mouseMoveImage = null;
      private Image _mouseDownImage = null;
      private Image _normalImage = null;

      #region ComboInfoHelper
      internal class ComboInfoHelper
      {
         [DllImport("user32")]
         private static extern bool GetComboBoxInfo(IntPtr hwndCombo, ref ComboBoxInfo info);

         #region RECT struct
         [StructLayout(LayoutKind.Sequential)]
         private struct RECT
         {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
         }
         #endregion

         #region ComboBoxInfo Struct
         [StructLayout(LayoutKind.Sequential)]
         private struct ComboBoxInfo
         {
            public int cbSize;
            public RECT rcItem;
            public RECT rcButton;
            public IntPtr stateButton;
            public IntPtr hwndCombo;
            public IntPtr hwndEdit;
            public IntPtr hwndList;
         }
         #endregion

         public static int GetComboDropDownWidth()
         {
            ComboBox cb = new ComboBox();
            int width = GetComboDropDownWidth(cb.Handle);
            cb.Dispose();
            return width;
         }
         public static int GetComboDropDownWidth(IntPtr handle)
         {
            ComboBoxInfo cbi = new ComboBoxInfo();
            cbi.cbSize = Marshal.SizeOf(cbi);
            GetComboBoxInfo(handle, ref cbi);
            int width = cbi.rcButton.Right - cbi.rcButton.Left;
            return width;
         }
      }
      #endregion

      [DllImport("user32.dll", EntryPoint = "SendMessageA")]
      private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, object lParam);

      [DllImport("user32")]
      private static extern IntPtr GetWindowDC(IntPtr hWnd);

      [DllImport("user32")]
      private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

      const int WM_ERASEBKGND = 0x14;
      const int WM_PAINT = 0xF;
      const int WM_NC_HITTEST = 0x84;
      const int WM_NC_PAINT = 0x85;
      const int WM_PRINTCLIENT = 0x318;
      const int WM_SETCURSOR = 0x20;

      private Pen BorderPen = new Pen(Shared.ControlBorderBackColor, 2);
      private Pen BorderPenControl = new Pen(Shared.ControlBorderBackColor, 2);
      private bool DroppedDown = false;
      private int InvalidateSince = 0;
      private static int DropDownButtonWidth = 17;

      static DateTimePicker()
      {
         // 2 pixel extra is for the 3D border around the pulldown button on the left and right
         DropDownButtonWidth = ComboInfoHelper.GetComboDropDownWidth() + 2;
      }

      public DateTimePicker()
         : base()
      {
         this.SetStyle(ControlStyles.DoubleBuffer, true);
         this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
      }

      protected override void OnCreateControl()
      {
         base.OnCreateControl();
         ResetBitmap();
      }

      public Image MouseMoveImage
      {
         get
         {
            return _mouseMoveImage;
         }
         set
         {
            _mouseMoveImage = value;
         }
      }

      public Image MouseDownImage
      {
         get
         {
            return _mouseDownImage;
         }
         set
         {
            _mouseDownImage = value;
         }
      }

      public Image NormalImage
      {
         get
         {
            return _normalImage;
         }
         set
         {
            _normalImage = value;
         }
      }

      public void ResetBitmap()
      {
         this.NormalImage = Shared.NomalDrawButton;
         this.MouseDownImage = Shared.MouseDownDrawButton;
         this.MouseMoveImage = Shared.MouseMoveDrawButton;
      }

      protected override void OnValueChanged(EventArgs eventargs)
      {
         base.OnValueChanged(eventargs);
         this.Invalidate();
      }

      protected override void WndProc(ref Message m)
      {

         IntPtr hDC = IntPtr.Zero;
         Graphics gdc = null;
         switch (m.Msg)
         {
            case WM_NC_PAINT:
                  hDC = GetWindowDC(m.HWnd);
                  gdc = Graphics.FromHdc(hDC);
                  SendMessage(this.Handle, WM_ERASEBKGND, hDC, 0);
                  SendPrintClientMsg();
                  SendMessage(this.Handle, WM_PAINT, IntPtr.Zero, 0);
                  OverrideControlBorder(gdc);
                  m.Result = (IntPtr)1; // indicate msg has been processed
                  ReleaseDC(m.HWnd, hDC);
                  gdc.Dispose();
                  break;
            case WM_PAINT:
                  base.WndProc(ref m);
                  hDC = GetWindowDC(m.HWnd);
                  gdc = Graphics.FromHdc(hDC);
                  OverrideDropDown(gdc);
                  OverrideControlBorder(gdc);
                  ReleaseDC(m.HWnd, hDC);
                  gdc.Dispose();
                  break;

            case WM_SETCURSOR:
                  base.WndProc(ref m);

                  if (DroppedDown && InvalidateSince < 3)
                  {
                     Invalidate();
                     InvalidateSince++;
                  }
                  break;
            default:
                  base.WndProc(ref m);
                  break;
         }
      }

      private void SendPrintClientMsg()
      {
         // We send this message for the control to redraw the client area
         Graphics gClient = this.CreateGraphics();
         IntPtr ptrClientDC = gClient.GetHdc();
         SendMessage(this.Handle, WM_PRINTCLIENT, ptrClientDC, 0);
         gClient.ReleaseHdc(ptrClientDC);
         gClient.Dispose();
      }

      private void OverrideDropDown(Graphics g)
      {
         //if (!this.ShowUpDown)
         //{
         Rectangle rect = new Rectangle(this.Width - DropDownButtonWidth, 0, DropDownButtonWidth, this.Height);
         //ControlPaint.DrawComboButton(g, rect, ButtonState.Flat);
         //}
         g.FillRectangle(new SolidBrush(Color.White), rect);

         if (this.Enabled)
         {
            if (_mouseEnter)
            {
                  g.DrawImage(this.MouseMoveImage, new Rectangle(this.Width - 20, 3, 16, 16));
            }
            else
            {
                  g.DrawImage(this.NormalImage, new Rectangle(this.Width - 20, 3, 16, 16));
            }
         }
         else
         {
            g.DrawImage(Shared.NotEnableDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));
         }
      }

      private bool _mouseEnter = false;

      protected override void OnMouseEnter(EventArgs e)
      {
         _mouseEnter = true;
         IntPtr hDC = IntPtr.Zero;
         Graphics gdc = null;
         hDC = Win32.GetWindowDC(this.Handle);
         gdc = Graphics.FromHdc(hDC);

         gdc.DrawImage(Shared.MouseMoveDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));

         Win32.ReleaseDC(this.Handle, hDC);
         gdc.Dispose();
         base.OnMouseEnter(e);
      }

      protected override void OnMouseLeave(EventArgs e)
      {
         _mouseEnter = false;
         IntPtr hDC = IntPtr.Zero;
         Graphics gdc = null;
         hDC = Win32.GetWindowDC(this.Handle);
         gdc = Graphics.FromHdc(hDC);

         gdc.DrawImage(Shared.NomalDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));

         Win32.ReleaseDC(this.Handle, hDC);
         gdc.Dispose();
         base.OnMouseLeave(e);
      }

      private void OverrideControlBorder(Graphics g)
      {
         g.DrawRectangle(new Pen(Shared.ControlBorderBackColor, 2), new Rectangle(0, 0, this.Width, this.Height));
      }

      protected override void OnDropDown(EventArgs eventargs)
      {
         InvalidateSince = 0;
         DroppedDown = true;
         base.OnDropDown(eventargs);
      }
      protected override void OnCloseUp(EventArgs eventargs)
      {
         DroppedDown = false;
         base.OnCloseUp(eventargs);
      }

      protected override void OnLostFocus(System.EventArgs e)
      {
         base.OnLostFocus(e);
         this.Invalidate();
      }

      protected override void OnGotFocus(System.EventArgs e)
      {
         base.OnGotFocus(e);
         this.Invalidate();
      }
      protected override void OnResize(EventArgs e)
      {
         base.OnResize(e);
         this.Invalidate();
      }

}
}[/code]

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