C# Winform DatePicker 重绘 _Winform

常设置属性、事件

CustomFormat：当Format属性设置为自定义类型时可自定义控件时间的显示格式；
Enabled：指示是否启用该控件，true为启用状态可编辑，false为禁用状态不可编辑；
MaxDate：设置控件可选择或输入的最大日期；
MinDate：设置控件可选择或输入的最小日期；
Name：指示代码中用来标识该对象的名称；
ShowUpDown：是否使用下拉日历修改日期，false为下拉日历模式，true为区域数字增减模式；
Text：与控件关联的文本，显示给用户看的内容说明；
ValueChanged事件：控件值更改时发生；

文章插图
【C# Winform DatePicker 重绘】

public class BzDatePicker : DateTimePicker{private Color skinColor = Color.MediumSlateBlue;private Color textColor = Color.White;private Color borderColor = Color.PaleVioletRed;private int borderSize = 0;private bool drppedDown = false;private Image calendarIcon = Properties.Resources.calendar_white_m;private RectangleF iconbuttonArea;private const int calendarIconWidth = 34;private const int arrowIconWidth = 17;[Category("BZ Advance")]public Color SkinColor{get{return skinColor;}set{skinColor = value;if (skinColor.GetBrightness() >= 0.8F){calendarIcon = Properties.Resources.calendar_white_m;}else{calendarIcon = Properties.Resources.calendar_drak_m;}this.Invalidate();}}[Category("BZ Advance")]public Color TextColor{get{return textColor;}set{textColor = value;this.Invalidate();}}[Category("BZ Advance")]public Color BorderColor{get{return borderColor;}set{borderColor = value;this.Invalidate();}}[Category("BZ Advance")]public int BorderSize{get{return borderSize;}set{borderSize = value;this.Invalidate();}}public BzDatePicker(){this.SetStyle(ControlStyles.UserPaint, true);this.MinimumSize = new Size(0, 35);this.Font = new Font(this.Font.Name, 9.5F);}protected override void OnDropDown(EventArgs eventargs){base.OnDropDown(eventargs);drppedDown = true;}protected override void OnCloseUp(EventArgs eventargs){base.OnCloseUp(eventargs);drppedDown = false;}protected override void OnKeyPress(KeyPressEventArgs e){base.OnKeyPress(e);e.Handled = true;}/// <summary>/// 重绘/// </summary>/// <param name="e"></param>protected override void OnPaint(PaintEventArgs e){using (Graphics g = this.CreateGraphics())using (Pen penBorder = new Pen(borderColor, BorderSize))using (SolidBrush skinBrush = new SolidBrush(skinColor))using (SolidBrush openIocnBrush = new SolidBrush(Color.FromArgb(50, 64, 64, 64)))using (SolidBrush textBrush = new SolidBrush(textColor))using (StringFormat textFormat = new StringFormat()){RectangleF clientArea = new RectangleF(0, 0, this.Width - 0.5F, this.Height - 0.5F);RectangleF iconArea = new RectangleF(clientArea.Width - calendarIconWidth, 0, calendarIconWidth, clientArea.Height);penBorder.Alignment = PenAlignment.Inset;textFormat.LineAlignment = StringAlignment.Center;g.FillRectangle(skinBrush, clientArea);g.DrawString(" " + this.Text, this.Font, textBrush, clientArea, textFormat);if (drppedDown){g.FillRectangle(openIocnBrush, iconArea);}if (borderSize >= 1){g.DrawRectangle(penBorder, clientArea.X, clientArea.Y, clientArea.Width, clientArea.Height);}g.DrawImage(calendarIcon, this.Width - calendarIcon.Width-5, (this.Height - calendarIcon.Height) / 2);}}protected override void OnHandleCreated(EventArgs e){base.OnHandleCreated(e);int iconWidth = GetIconButtonWidth();iconbuttonArea= new RectangleF(this.Width - iconWidth, 0, iconWidth, this.Height);}protected override void OnMouseMove(MouseEventArgs e){base.OnMouseMove(e);if (iconbuttonArea.Contains(e.Location)){this.Cursor = Cursors.Hand;}else{this.Cursor = Cursors.Default;}}/// <summary>/// 设置图标/// </summary>/// <returns></returns>private int GetIconButtonWidth(){int textWidth = TextRenderer.MeasureText(this.Text, this.Font).Width;if (textWidth < this.Width - (calendarIconWidth + 20)){return calendarIconWidth;}return arrowIconWidth;}