通过上面的效果截图可以看到，重绘后的MenuStrip和ContextMenuStrip可以添加自己的LOGO信息，实现了类似OFFICE2007的菜单显示效果。
.NET对菜单控件的绘制提供了一个抽象类ToolStripRenderer，这个类里面提供了相应的绘制函数，只要重写这些函数，就可以实现菜单的重绘。MenuStrip和ContextMenuStrip提供了一个属性Renderer，该属性就是由ToolStripRenderer定义的，MenuStrip和ContextMenuStrip的Renderer属性设置为继承ToolStripRenderer的绘制类，就可以轻松的绘制MenuStrip和ContextMenuStrip的皮肤了。
下面就是继承ToolStripRenderer类实现的本文开始贴出的菜单效果图的ProfessionalToolStripRendererEx类的代码：
public class ProfessionalToolStripRendererEx
: ToolStripRenderer
{
private static readonly int OffsetMargin = 24;
private string _menuLogoString = "更多精彩尽在 www.csharpwin.com";
private ToolStripColorTable _colorTable;
public ProfessionalToolStripRendererEx()
: base()
{
}
public ProfessionalToolStripRendererEx(
ToolStripColorTable colorTable) : base()
{
_colorTable = colorTable;
}
public string MenuLogoString
{
get { return _menuLogoString; }
set { _menuLogoString = value; }
}
protected virtual ToolStripColorTable ColorTable
{
get
{
if (_colorTable == null)
{
_colorTable = new ToolStripColorTable();
}
return _colorTable;
}
}
protected override void OnRenderToolStripBackground(
ToolStripRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
Graphics g = e.Graphics;
Rectangle bounds = e.AffectedBounds;
if (toolStrip is ToolStripDropDown)
{
RegionHelper.CreateRegion(toolStrip, bounds);
using (SolidBrush brush = new SolidBrush(ColorTable.BackNormal))
{
g.FillRectangle(brush, bounds);
}
}
else if (toolStrip is MenuStrip)
{
LinearGradientMode mode =
toolStrip.Orientation == Orientation.Horizontal ?
LinearGradientMode.Vertical : LinearGradientMode.Horizontal;
RenderHelper.RenderBackgroundInternal(
g,
bounds,
ColorTable.Base,
ColorTable.Border,
ColorTable.BackNormal,
RoundStyle.None,
0,
.35f,
false,
false,
mode);
}
else
{
base.OnRenderToolStripBackground(e);
}
}
protected override void OnRenderImageMargin(
ToolStripRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
Graphics g = e.Graphics;
Rectangle bounds = e.AffectedBounds;
if (toolStrip is ToolStripDropDown)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
bool bRightToLeft = toolStrip.RightToLeft == RightToLeft.Yes;
Rectangle imageBackRect = bounds;
imageBackRect.Width = OffsetMargin;
if (bDrawLogo)
{
Rectangle logoRect = bounds;
logoRect.Width = OffsetMargin;
if (bRightToLeft)
{
logoRect.X -= 2;
imageBackRect.X = logoRect.X - OffsetMargin;
}
else
{
logoRect.X += 2;
imageBackRect.X = logoRect.Right;
}
logoRect.Y += 1;
logoRect.Height -= 2;
using (LinearGradientBrush brush = new LinearGradientBrush(
logoRect,
ColorTable.BackHover,
ColorTable.BackNormal,
90f))
{
Blend blend = new Blend();
blend.Positions = new float[] { 0f, .2f, 1f };
blend.Factors = new float[] { 0f, 0.1f, .9f };
brush.Blend = blend;
logoRect.Y += 1;
logoRect.Height -= 2;
using (GraphicsPath path =
GraphicsPathHelper.CreatePath(logoRect, 8, RoundStyle.All, false))
{
using (SmoothingModeGraphics sg = new SmoothingModeGraphics(g))
{
g.FillPath(brush, path);
}
}
}
StringFormat sf = new StringFormat(StringFormatFlags.NoWrap);
Font font = new Font(
toolStrip.Font.FontFamily, 11, FontStyle.Bold);
sf.Alignment = StringAlignment.Near;
sf.LineAlignment = StringAlignment.Center;
sf.Trimming = StringTrimming.EllipsisCharacter;
g.TranslateTransform(logoRect.X, logoRect.Bottom);
g.RotateTransform(270f);
if (!string.IsNullOrEmpty(MenuLogoString))
{
Rectangle newRect = new Rectangle(
0, 0, logoRect.Height, logoRect.Width);
using (Brush brush = new SolidBrush(ColorTable.Fore))
{
using (TextRenderingHintGraphics tg =
new TextRenderingHintGraphics(g))
{
g.DrawString(
MenuLogoString,
font,
brush,
newRect,
sf);
}
}
}
g.ResetTransform();
}
else
{
if (bRightToLeft)
{
imageBackRect.X -= 3;
}
else
{
imageBackRect.X += 3;
}
}
imageBackRect.Y += 2;
imageBackRect.Height -= 4;
using (SolidBrush brush = new SolidBrush(ColorTable.DropDownImageBack))
{
g.FillRectangle(brush, imageBackRect);
}
Point ponitStart;
Point pointEnd;
if (bRightToLeft)
{
ponitStart = new Point(imageBackRect.X, imageBackRect.Y);
pointEnd = new Point(imageBackRect.X, imageBackRect.Bottom);
}
else
{
ponitStart = new Point(imageBackRect.Right - 1, imageBackRect.Y);
pointEnd = new Point(imageBackRect.Right - 1, imageBackRect.Bottom);
}
using (Pen pen = new Pen(ColorTable.DropDownImageSeparator))
{
g.DrawLine(pen, ponitStart, pointEnd);
}
}
else
{
base.OnRenderImageMargin(e);
}
}
protected override void OnRenderToolStripBorder(
ToolStripRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
Graphics g = e.Graphics;
Rectangle bounds = e.AffectedBounds;
if (toolStrip is ToolStripDropDown)
{
using (SmoothingModeGraphics sg = new SmoothingModeGraphics(g))
{
using (GraphicsPath path =
GraphicsPathHelper.CreatePath(bounds, 8, RoundStyle.All, true))
{
using (Pen pen = new Pen(ColorTable.DropDownImageSeparator))
{
path.Widen(pen);
g.DrawPath(pen, path);
}
}
}
bounds.Inflate(-1, -1);
using (GraphicsPath innerPath = GraphicsPathHelper.CreatePath(
bounds, 8, RoundStyle.All, true))
{
using (Pen pen = new Pen(ColorTable.BackNormal))
{
g.DrawPath(pen, innerPath);
}
}
}
else if (toolStrip is StatusStrip)
{
using (Pen pen = new Pen(ColorTable.Border))
{
e.Graphics.DrawRectangle(
pen, 0, 0, e.ToolStrip.Width - 1, e.ToolStrip.Height - 1);
}
}
else if (toolStrip is MenuStrip)
{
base.OnRenderToolStripBorder(e);
}
else
{
using (Pen pen = new Pen(ColorTable.Border))
{
g.DrawRectangle(
pen, 0, 0, e.ToolStrip.Width - 1, e.ToolStrip.Height - 1);
}
}
}
protected override void OnRenderMenuItemBackground(
ToolStripItemRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
ToolStripItem item = e.Item;
if (!item.Enabled)
{
return;
}
Graphics g = e.Graphics;
Rectangle rect = new Rectangle(Point.Empty, e.Item.Size);
if (toolStrip is MenuStrip)
{
LinearGradientMode mode =
toolStrip.Orientation == Orientation.Horizontal ?
LinearGradientMode.Vertical : LinearGradientMode.Horizontal;
if (item.Selected)
{
RenderHelper.RenderBackgroundInternal(
g,
rect,
ColorTable.BackHover,
ColorTable.Border,
ColorTable.BackNormal,
RoundStyle.All,
true,
true,
mode);
}
else if (item.Pressed)
{
RenderHelper.RenderBackgroundInternal(
g,
rect,
ColorTable.BackPressed,
ColorTable.Border,
ColorTable.BackNormal,
RoundStyle.All,
true,
true,
mode);
}
else
{
base.OnRenderMenuItemBackground(e);
}
}
else if (toolStrip is ToolStripDropDown)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
int offsetMargin = bDrawLogo ? OffsetMargin : 0;
if (item.RightToLeft == RightToLeft.Yes)
{
rect.X += 4;
}
else
{
rect.X += offsetMargin + 4;
}
rect.Width -= offsetMargin + 8;
rect.Height--;
if (item.Selected)
{
RenderHelper.RenderBackgroundInternal(
g,
rect,
ColorTable.BackHover,
ColorTable.Border,
ColorTable.BackNormal,
RoundStyle.All,
true,
true,
LinearGradientMode.Vertical);
}
else
{
base.OnRenderMenuItemBackground(e);
}
}
else
{
base.OnRenderMenuItemBackground(e);
}
}
protected override void OnRenderItemImage(
ToolStripItemImageRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
Graphics g = e.Graphics;
if (toolStrip is ToolStripDropDown &&
e.Item is ToolStripMenuItem)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
int offsetMargin = bDrawLogo ? OffsetMargin : 0;
ToolStripMenuItem item = (ToolStripMenuItem)e.Item;
if (item.Checked)
{
return;
}
Rectangle rect = e.ImageRectangle;
if (e.Item.RightToLeft == RightToLeft.Yes)
{
rect.X -= offsetMargin + 2;
}
else
{
rect.X += offsetMargin + 2;
}
using (InterpolationModeGraphics ig =
new InterpolationModeGraphics(g))
{
ToolStripItemImageRenderEventArgs ne =
new ToolStripItemImageRenderEventArgs(
g, e.Item, e.Image, rect);
base.OnRenderItemImage(ne);
}
}
else
{
base.OnRenderItemImage(e);
}
}
protected override void OnRenderItemText(
ToolStripItemTextRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
e.TextColor = ColorTable.Fore;
if (toolStrip is ToolStripDropDown &&
e.Item is ToolStripMenuItem)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
int offsetMargin = bDrawLogo ? 18 : 0;
Rectangle rect = e.TextRectangle;
if (e.Item.RightToLeft == RightToLeft.Yes)
{
rect.X -= offsetMargin;
}
else
{
rect.X += offsetMargin;
}
e.TextRectangle = rect;
}
base.OnRenderItemText(e);
}
protected override void OnRenderItemCheck(
ToolStripItemImageRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
Graphics g = e.Graphics;
if (toolStrip is ToolStripDropDown &&
e.Item is ToolStripMenuItem)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
int offsetMargin = bDrawLogo ? OffsetMargin : 0;
Rectangle rect = e.ImageRectangle;
if (e.Item.RightToLeft == RightToLeft.Yes)
{
rect.X -= offsetMargin + 2;
}
else
{
rect.X += offsetMargin + 2;
}
rect.Width = 13;
rect.Y += 1;
rect.Height -= 3;
using (SmoothingModeGraphics sg = new SmoothingModeGraphics(g))
{
using (GraphicsPath path = new GraphicsPath())
{
path.AddRectangle(rect);
using (PathGradientBrush brush = new PathGradientBrush(path))
{
brush.CenterColor = Color.White;
brush.SurroundColors = new Color[] { ControlPaint.Light(ColorTable.BackNormal) };
Blend blend = new Blend();
blend.Positions = new float[] { 0f, 0.3f, 1f };
blend.Factors = new float[] { 0f, 0.5f, 1f };
brush.Blend = blend;
g.FillRectangle(brush, rect);
}
}
using (Pen pen = new Pen(ControlPaint.Light(ColorTable.BackNormal)))
{
g.DrawRectangle(pen, rect);
}
ControlPaintEx.DrawCheckedFlag(g, rect, ColorTable.Fore);
}
}
else
{
base.OnRenderItemCheck(e);
}
}
protected override void OnRenderArrow(
ToolStripArrowRenderEventArgs e)
{
if (e.Item.Enabled)
{
e.ArrowColor = ColorTable.Fore;
}
ToolStrip toolStrip = e.Item.Owner;
if (toolStrip is ToolStripDropDown &&
e.Item is ToolStripMenuItem)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
int offsetMargin = bDrawLogo ? 3 : 0;
Rectangle rect = e.ArrowRectangle;
if (e.Item.RightToLeft == RightToLeft.Yes)
{
rect.X -= offsetMargin;
}
else
{
rect.X += offsetMargin;
}
e.ArrowRectangle = rect;
}
base.OnRenderArrow(e);
}
protected override void OnRenderSeparator(
ToolStripSeparatorRenderEventArgs e)
{
ToolStrip toolStrip = e.ToolStrip;
Rectangle rect = e.Item.ContentRectangle;
Graphics g = e.Graphics;
if (toolStrip is ToolStripDropDown)
{
bool bDrawLogo = NeedDrawLogo(toolStrip);
int offsetMargin = bDrawLogo ?
OffsetMargin * 2 : OffsetMargin;
if (e.Item.RightToLeft != RightToLeft.Yes)
{
rect.X += offsetMargin + 2;
}
rect.Width -= offsetMargin + 4;
}
RenderSeparatorLine(
g,
rect,
ColorTable.DropDownImageSeparator,
ColorTable.BackNormal,
SystemColors.ControlLightLight,
e.Vertical);
}
internal void RenderSeparatorLine(
Graphics g,
Rectangle rect,
Color baseColor,
Color backColor,
Color shadowColor,
bool vertical)
{
float angle;
if (vertical)
{
angle = 90F;
}
else
{
angle = 180F;
}
using (LinearGradientBrush brush = new LinearGradientBrush(
rect,
baseColor,
backColor,
angle))
{
Blend blend = new Blend();
blend.Positions = new float[] { 0f, .2f, .5f, .8f, 1f };
blend.Factors = new float[] { 1f, .3f, 0f, .3f, 1f };
brush.Blend = blend;
using (Pen pen = new Pen(brush))
{
if (vertical)
{
g.DrawLine(pen, rect.X, rect.Y, rect.X, rect.Bottom);
}
else
{
g.DrawLine(pen, rect.X, rect.Y, rect.Right, rect.Y);
}
brush.LinearColors = new Color[] {
shadowColor, ColorTable.BackNormal };
pen.Brush = brush;
if (vertical)
{
g.DrawLine(pen, rect.X + 1, rect.Y, rect.X + 1, rect.Bottom);
}
else
{
g.DrawLine(pen, rect.X, rect.Y + 1, rect.Right, rect.Y + 1);
}
}
}
}
internal bool NeedDrawLogo(ToolStrip toolStrip)
{
ToolStripDropDown dropDown = toolStrip as ToolStripDropDown;
bool bDrawLogo =
(dropDown.OwnerItem != null &&
dropDown.OwnerItem.Owner is MenuStrip) ||
(toolStrip is ContextMenuStrip);
return bDrawLogo;
}
}
}
实现MenuStrip和ContextMenuStrip重绘并不是很难的事情，这里就不过多的介绍，C# 使用GDI+绘制漂亮的MenuStrip和ContextMenuStrip皮肤就为你介绍到这里，希望你能喜欢。
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作者：Starts_2000
出处：CS 程序员之窗 http://www.csharpwin.com。
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