（三十五）c#Winform自定义控件-Tab页
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前提
入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。
GitHub：https://github.com/kwwwvagaa/NetWinformControl
码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
如果觉得写的还行，请点个 star 支持一下吧
欢迎前来交流探讨： 企鹅群568015492 idkey=6e08741ef16fe53bf0314c1c9e336c4f626047943a8b76bac062361bab6b4f8d">
目录
https://www.cnblogs.com/bfyx/p/11364884.html
准备工作
此控件在https://www.cnblogs.com/belx/articles/9188577.html基础上调整修改，特此感谢
开始
添加一个用户组件，命名TabControlExt，继承自TabControl
几个重写属性
private Color _backColor = Color.White;
[Browsable(true)]
[EditorBrowsable(EditorBrowsableState.Always)]
[DefaultValue(typeof(Color), "White")]
public override Color BackColor
{
get { return _backColor; }
set
{
_backColor = value;
base.Invalidate(true);
}
} private Color _borderColor = Color.FromArgb(, , );
[DefaultValue(typeof(Color), "232, 232, 232")]
[Description("TabContorl边框色")]
public Color BorderColor
{
get { return _borderColor; }
set
{
_borderColor = value;
base.Invalidate(true);
}
} private Color _headSelectedBackColor = Color.FromArgb(, , );
[DefaultValue(typeof(Color), "255, 85, 51")]
[Description("TabPage头部选中后的背景颜色")]
public Color HeadSelectedBackColor
{
get { return _headSelectedBackColor; }
set { _headSelectedBackColor = value; }
} private Color _headSelectedBorderColor = Color.FromArgb(, , );
[DefaultValue(typeof(Color), "232, 232, 232")]
[Description("TabPage头部选中后的边框颜色")]
public Color HeadSelectedBorderColor
{
get { return _headSelectedBorderColor; }
set { _headSelectedBorderColor = value; }
} private Color _headerBackColor = Color.White;
[DefaultValue(typeof(Color), "White")]
[Description("TabPage头部默认背景颜色")]
public Color HeaderBackColor
{
get { return _headerBackColor; }
set { _headerBackColor = value; }
}
重写背景
protected override void OnPaintBackground(PaintEventArgs pevent)
{
if (this.DesignMode == true)
{
LinearGradientBrush backBrush = new LinearGradientBrush(
this.Bounds,
SystemColors.ControlLightLight,
SystemColors.ControlLight,
LinearGradientMode.Vertical);
pevent.Graphics.FillRectangle(backBrush, this.Bounds);
backBrush.Dispose();
}
else
{
this.PaintTransparentBackground(pevent.Graphics, this.ClientRectangle);
}
}
/// <summary>
/// TabContorl 背景色设置
/// </summary>
/// <param name="g"></param>
/// <param name="clipRect"></param>
protected void PaintTransparentBackground(Graphics g, Rectangle clipRect)
{
if ((this.Parent != null))
{
clipRect.Offset(this.Location);
PaintEventArgs e = new PaintEventArgs(g, clipRect);
GraphicsState state = g.Save();
g.SmoothingMode = SmoothingMode.HighSpeed;
try
{
g.TranslateTransform((float)-this.Location.X, (float)-this.Location.Y);
this.InvokePaintBackground(this.Parent, e);
this.InvokePaint(this.Parent, e);
}
finally
{
g.Restore(state);
clipRect.Offset(-this.Location.X, -this.Location.Y);
//新加片段,待测试
using (SolidBrush brush = new SolidBrush(_backColor))
{
clipRect.Inflate(, );
g.FillRectangle(brush, clipRect);
}
}
}
else
{
System.Drawing.Drawing2D.LinearGradientBrush backBrush = new System.Drawing.Drawing2D.LinearGradientBrush(this.Bounds, SystemColors.ControlLightLight, SystemColors.ControlLight, System.Drawing.Drawing2D.LinearGradientMode.Vertical);
g.FillRectangle(backBrush, this.Bounds);
backBrush.Dispose();
}
}
重绘
protected override void OnPaint(PaintEventArgs e)
{
// Paint the Background
base.OnPaint(e);
this.PaintTransparentBackground(e.Graphics, this.ClientRectangle);
this.PaintAllTheTabs(e);
this.PaintTheTabPageBorder(e);
this.PaintTheSelectedTab(e);
}
辅助函数
private void PaintAllTheTabs(System.Windows.Forms.PaintEventArgs e)
{
if (this.TabCount > )
{
for (int index = ; index < this.TabCount; index++)
{
this.PaintTab(e, index);
}
}
} private void PaintTab(System.Windows.Forms.PaintEventArgs e, int index)
{
GraphicsPath path = this.GetTabPath(index);
this.PaintTabBackground(e.Graphics, index, path);
this.PaintTabBorder(e.Graphics, index, path);
this.PaintTabText(e.Graphics, index);
this.PaintTabImage(e.Graphics, index);
} /// <summary>
/// 设置选项卡头部颜色
/// </summary>
/// <param name="graph"></param>
/// <param name="index"></param>
/// <param name="path"></param>
private void PaintTabBackground(System.Drawing.Graphics graph, int index, System.Drawing.Drawing2D.GraphicsPath path)
{
Rectangle rect = this.GetTabRect(index);
System.Drawing.Brush buttonBrush = new System.Drawing.Drawing2D.LinearGradientBrush(rect, _headerBackColor, _headerBackColor, LinearGradientMode.Vertical); //非选中时候的 TabPage 页头部背景色
graph.FillPath(buttonBrush, path);
//if (index == this.SelectedIndex)
//{
// //buttonBrush = new System.Drawing.SolidBrush(_headSelectedBackColor);
// graph.DrawLine(new Pen(_headerBackColor), rect.Right+2, rect.Bottom, rect.Left + 1, rect.Bottom);
//}
buttonBrush.Dispose();
} /// <summary>
/// 设置选项卡头部边框色
/// </summary>
/// <param name="graph"></param>
/// <param name="index"></param>
/// <param name="path"></param>
private void PaintTabBorder(System.Drawing.Graphics graph, int index, System.Drawing.Drawing2D.GraphicsPath path)
{
Pen borderPen = new Pen(_borderColor);// TabPage 非选中时候的 TabPage 头部边框色
if (index == this.SelectedIndex)
{
borderPen = new Pen(_headSelectedBorderColor); // TabPage 选中后的 TabPage 头部边框色
}
graph.DrawPath(borderPen, path);
borderPen.Dispose();
} private void PaintTabImage(System.Drawing.Graphics g, int index)
{
Image tabImage = null;
if (this.TabPages[index].ImageIndex > - && this.ImageList != null)
{
tabImage = this.ImageList.Images[this.TabPages[index].ImageIndex];
}
else if (this.TabPages[index].ImageKey.Trim().Length > && this.ImageList != null)
{
tabImage = this.ImageList.Images[this.TabPages[index].ImageKey];
}
if (tabImage != null)
{
Rectangle rect = this.GetTabRect(index);
g.DrawImage(tabImage, rect.Right - rect.Height - , , rect.Height - , rect.Height - );
}
} private void PaintTabText(System.Drawing.Graphics graph, int index)
{
string tabtext = this.TabPages[index].Text; System.Drawing.StringFormat format = new System.Drawing.StringFormat();
format.Alignment = StringAlignment.Near;
format.LineAlignment = StringAlignment.Center;
format.Trimming = StringTrimming.EllipsisCharacter; Brush forebrush = null; if (this.TabPages[index].Enabled == false)
{
forebrush = SystemBrushes.ControlDark;
}
else
{
forebrush = SystemBrushes.ControlText;
} Font tabFont = this.Font;
if (index == this.SelectedIndex)
{
if (this.TabPages[index].Enabled != false)
{
forebrush = new SolidBrush(_headSelectedBackColor);
}
} Rectangle rect = this.GetTabRect(index); var txtSize = ControlHelper.GetStringWidth(tabtext, graph, tabFont);
Rectangle rect2 = new Rectangle(rect.Left + (rect.Width - txtSize) / - , rect.Top, rect.Width, rect.Height); graph.DrawString(tabtext, tabFont, forebrush, rect2, format);
} /// <summary>
/// 设置 TabPage 内容页边框色
/// </summary>
/// <param name="e"></param>
private void PaintTheTabPageBorder(System.Windows.Forms.PaintEventArgs e)
{
if (this.TabCount > )
{
Rectangle borderRect = this.TabPages[].Bounds;
//borderRect.Inflate(1, 1);
Rectangle rect = new Rectangle(borderRect.X - , borderRect.Y-, borderRect.Width + , borderRect.Height+);
ControlPaint.DrawBorder(e.Graphics, rect, this.BorderColor, ButtonBorderStyle.Solid);
}
} /// <summary>
/// // TabPage 页头部间隔色
/// </summary>
/// <param name="e"></param>
private void PaintTheSelectedTab(System.Windows.Forms.PaintEventArgs e)
{
if (this.SelectedIndex == -)
return;
Rectangle selrect;
int selrectRight = ;
selrect = this.GetTabRect(this.SelectedIndex);
selrectRight = selrect.Right;
e.Graphics.DrawLine(new Pen(_headSelectedBackColor), selrect.Left, selrect.Bottom + , selrectRight, selrect.Bottom + );
} private GraphicsPath GetTabPath(int index)
{
System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
path.Reset(); Rectangle rect = this.GetTabRect(index); switch (Alignment)
{
case TabAlignment.Top: break;
case TabAlignment.Bottom: break;
case TabAlignment.Left: break;
case TabAlignment.Right: break;
} path.AddLine(rect.Left, rect.Top, rect.Left, rect.Bottom + );
path.AddLine(rect.Left, rect.Top, rect.Right , rect.Top);
path.AddLine(rect.Right , rect.Top, rect.Right , rect.Bottom + );
path.AddLine(rect.Right , rect.Bottom + , rect.Left, rect.Bottom + ); return path;
}
2个重写函数处理字体相关
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
private const int WM_SETFONT = 0x30;
private const int WM_FONTCHANGE = 0x1d;
protected override void OnCreateControl()
{
base.OnCreateControl();
this.OnFontChanged(EventArgs.Empty);
}
protected override void OnFontChanged(EventArgs e)
{
base.OnFontChanged(e);
IntPtr hFont = this.Font.ToHfont();
SendMessage(this.Handle, WM_SETFONT, hFont, (IntPtr)(-));
SendMessage(this.Handle, WM_FONTCHANGE, IntPtr.Zero, IntPtr.Zero);
this.UpdateStyles();
}
完整代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms; namespace HZH_Controls.Controls
{
public class TabControlExt : TabControl
{
public TabControlExt()
: base()
{
SetStyles();
this.Multiline = true;
this.ItemSize = new Size(this.ItemSize.Width, );
} private void SetStyles()
{
base.SetStyle(
ControlStyles.UserPaint |
ControlStyles.DoubleBuffer |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.AllPaintingInWmPaint |
ControlStyles.ResizeRedraw |
ControlStyles.SupportsTransparentBackColor, true);
base.UpdateStyles();
} private Color _backColor = Color.White;
[Browsable(true)]
[EditorBrowsable(EditorBrowsableState.Always)]
[DefaultValue(typeof(Color), "White")]
public override Color BackColor
{
get { return _backColor; }
set
{
_backColor = value;
base.Invalidate(true);
}
} private Color _borderColor = Color.FromArgb(, , );
[DefaultValue(typeof(Color), "232, 232, 232")]
[Description("TabContorl边框色")]
public Color BorderColor
{
get { return _borderColor; }
set
{
_borderColor = value;
base.Invalidate(true);
}
} private Color _headSelectedBackColor = Color.FromArgb(, , );
[DefaultValue(typeof(Color), "255, 85, 51")]
[Description("TabPage头部选中后的背景颜色")]
public Color HeadSelectedBackColor
{
get { return _headSelectedBackColor; }
set { _headSelectedBackColor = value; }
} private Color _headSelectedBorderColor = Color.FromArgb(, , );
[DefaultValue(typeof(Color), "232, 232, 232")]
[Description("TabPage头部选中后的边框颜色")]
public Color HeadSelectedBorderColor
{
get { return _headSelectedBorderColor; }
set { _headSelectedBorderColor = value; }
} private Color _headerBackColor = Color.White;
[DefaultValue(typeof(Color), "White")]
[Description("TabPage头部默认背景颜色")]
public Color HeaderBackColor
{
get { return _headerBackColor; }
set { _headerBackColor = value; }
} protected override void OnPaintBackground(PaintEventArgs pevent)
{
if (this.DesignMode == true)
{
LinearGradientBrush backBrush = new LinearGradientBrush(
this.Bounds,
SystemColors.ControlLightLight,
SystemColors.ControlLight,
LinearGradientMode.Vertical);
pevent.Graphics.FillRectangle(backBrush, this.Bounds);
backBrush.Dispose();
}
else
{
this.PaintTransparentBackground(pevent.Graphics, this.ClientRectangle);
}
} /// <summary>
/// TabContorl 背景色设置
/// </summary>
/// <param name="g"></param>
/// <param name="clipRect"></param>
protected void PaintTransparentBackground(Graphics g, Rectangle clipRect)
{
if ((this.Parent != null))
{
clipRect.Offset(this.Location);
PaintEventArgs e = new PaintEventArgs(g, clipRect);
GraphicsState state = g.Save();
g.SmoothingMode = SmoothingMode.HighSpeed;
try
{
g.TranslateTransform((float)-this.Location.X, (float)-this.Location.Y);
this.InvokePaintBackground(this.Parent, e);
this.InvokePaint(this.Parent, e);
}
finally
{
g.Restore(state);
clipRect.Offset(-this.Location.X, -this.Location.Y);
//新加片段,待测试
using (SolidBrush brush = new SolidBrush(_backColor))
{
clipRect.Inflate(, );
g.FillRectangle(brush, clipRect);
}
}
}
else
{
System.Drawing.Drawing2D.LinearGradientBrush backBrush = new System.Drawing.Drawing2D.LinearGradientBrush(this.Bounds, SystemColors.ControlLightLight, SystemColors.ControlLight, System.Drawing.Drawing2D.LinearGradientMode.Vertical);
g.FillRectangle(backBrush, this.Bounds);
backBrush.Dispose();
}
} protected override void OnPaint(PaintEventArgs e)
{
// Paint the Background
base.OnPaint(e);
this.PaintTransparentBackground(e.Graphics, this.ClientRectangle);
this.PaintAllTheTabs(e);
this.PaintTheTabPageBorder(e);
this.PaintTheSelectedTab(e);
} private void PaintAllTheTabs(System.Windows.Forms.PaintEventArgs e)
{
if (this.TabCount > )
{
for (int index = ; index < this.TabCount; index++)
{
this.PaintTab(e, index);
}
}
} private void PaintTab(System.Windows.Forms.PaintEventArgs e, int index)
{
GraphicsPath path = this.GetTabPath(index);
this.PaintTabBackground(e.Graphics, index, path);
this.PaintTabBorder(e.Graphics, index, path);
this.PaintTabText(e.Graphics, index);
this.PaintTabImage(e.Graphics, index);
} /// <summary>
/// 设置选项卡头部颜色
/// </summary>
/// <param name="graph"></param>
/// <param name="index"></param>
/// <param name="path"></param>
private void PaintTabBackground(System.Drawing.Graphics graph, int index, System.Drawing.Drawing2D.GraphicsPath path)
{
Rectangle rect = this.GetTabRect(index);
System.Drawing.Brush buttonBrush = new System.Drawing.Drawing2D.LinearGradientBrush(rect, _headerBackColor, _headerBackColor, LinearGradientMode.Vertical); //非选中时候的 TabPage 页头部背景色
graph.FillPath(buttonBrush, path);
//if (index == this.SelectedIndex)
//{
// //buttonBrush = new System.Drawing.SolidBrush(_headSelectedBackColor);
// graph.DrawLine(new Pen(_headerBackColor), rect.Right+2, rect.Bottom, rect.Left + 1, rect.Bottom);
//}
buttonBrush.Dispose();
} /// <summary>
/// 设置选项卡头部边框色
/// </summary>
/// <param name="graph"></param>
/// <param name="index"></param>
/// <param name="path"></param>
private void PaintTabBorder(System.Drawing.Graphics graph, int index, System.Drawing.Drawing2D.GraphicsPath path)
{
Pen borderPen = new Pen(_borderColor);// TabPage 非选中时候的 TabPage 头部边框色
if (index == this.SelectedIndex)
{
borderPen = new Pen(_headSelectedBorderColor); // TabPage 选中后的 TabPage 头部边框色
}
graph.DrawPath(borderPen, path);
borderPen.Dispose();
} private void PaintTabImage(System.Drawing.Graphics g, int index)
{
Image tabImage = null;
if (this.TabPages[index].ImageIndex > - && this.ImageList != null)
{
tabImage = this.ImageList.Images[this.TabPages[index].ImageIndex];
}
else if (this.TabPages[index].ImageKey.Trim().Length > && this.ImageList != null)
{
tabImage = this.ImageList.Images[this.TabPages[index].ImageKey];
}
if (tabImage != null)
{
Rectangle rect = this.GetTabRect(index);
g.DrawImage(tabImage, rect.Right - rect.Height - , , rect.Height - , rect.Height - );
}
} private void PaintTabText(System.Drawing.Graphics graph, int index)
{
string tabtext = this.TabPages[index].Text; System.Drawing.StringFormat format = new System.Drawing.StringFormat();
format.Alignment = StringAlignment.Near;
format.LineAlignment = StringAlignment.Center;
format.Trimming = StringTrimming.EllipsisCharacter; Brush forebrush = null; if (this.TabPages[index].Enabled == false)
{
forebrush = SystemBrushes.ControlDark;
}
else
{
forebrush = SystemBrushes.ControlText;
} Font tabFont = this.Font;
if (index == this.SelectedIndex)
{
if (this.TabPages[index].Enabled != false)
{
forebrush = new SolidBrush(_headSelectedBackColor);
}
} Rectangle rect = this.GetTabRect(index); var txtSize = ControlHelper.GetStringWidth(tabtext, graph, tabFont);
Rectangle rect2 = new Rectangle(rect.Left + (rect.Width - txtSize) / - , rect.Top, rect.Width, rect.Height); graph.DrawString(tabtext, tabFont, forebrush, rect2, format);
} /// <summary>
/// 设置 TabPage 内容页边框色
/// </summary>
/// <param name="e"></param>
private void PaintTheTabPageBorder(System.Windows.Forms.PaintEventArgs e)
{
if (this.TabCount > )
{
Rectangle borderRect = this.TabPages[].Bounds;
//borderRect.Inflate(1, 1);
Rectangle rect = new Rectangle(borderRect.X - , borderRect.Y - , borderRect.Width + , borderRect.Height + );
ControlPaint.DrawBorder(e.Graphics, rect, this.BorderColor, ButtonBorderStyle.Solid);
}
} /// <summary>
/// // TabPage 页头部间隔色
/// </summary>
/// <param name="e"></param>
private void PaintTheSelectedTab(System.Windows.Forms.PaintEventArgs e)
{
if (this.SelectedIndex == -)
return;
Rectangle selrect;
int selrectRight = ;
selrect = this.GetTabRect(this.SelectedIndex);
selrectRight = selrect.Right;
e.Graphics.DrawLine(new Pen(_headSelectedBackColor), selrect.Left, selrect.Bottom + , selrectRight, selrect.Bottom + );
} private GraphicsPath GetTabPath(int index)
{
System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
path.Reset(); Rectangle rect = this.GetTabRect(index); switch (Alignment)
{
case TabAlignment.Top: break;
case TabAlignment.Bottom: break;
case TabAlignment.Left: break;
case TabAlignment.Right: break;
} path.AddLine(rect.Left, rect.Top, rect.Left, rect.Bottom + );
path.AddLine(rect.Left, rect.Top, rect.Right, rect.Top);
path.AddLine(rect.Right, rect.Top, rect.Right, rect.Bottom + );
path.AddLine(rect.Right, rect.Bottom + , rect.Left, rect.Bottom + ); return path;
} [DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); private const int WM_SETFONT = 0x30;
private const int WM_FONTCHANGE = 0x1d; protected override void OnCreateControl()
{
base.OnCreateControl();
this.OnFontChanged(EventArgs.Empty);
} protected override void OnFontChanged(EventArgs e)
{
base.OnFontChanged(e);
IntPtr hFont = this.Font.ToHfont();
SendMessage(this.Handle, WM_SETFONT, hFont, (IntPtr)(-));
SendMessage(this.Handle, WM_FONTCHANGE, IntPtr.Zero, IntPtr.Zero);
this.UpdateStyles();
}
}
}
用处及效果
最后的话
如果你喜欢的话，请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星 星吧
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