有的时候,一个自定义的鼠标光标能给你的程序增色不少。本文这里介绍一下如何在.net桌面程序中自定义鼠标光标。由于.net的桌面程序分为WinForm和WPF两种,这里分别介绍一下。
WinForm程序
对于WinForm程序,可以通过修改Control.Cursor属性来实现光标的修改,如果我们有光标文件的话,可以直接通过如下代码实现自定义光标:
this.Cursor = new Cursor("myCursor.cur");
但这种方式不是本文介绍的重点,本文主要介绍如何自己绘制光标,这样则具有更多的可控性和灵活性。
创建一个自定义光标,首先需要定义需要一个光标结构 ICONINFO ,它的.net版本如下:
public struct IconInfo
{
public bool fIcon;
public int xHotspot;
public int yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
然后通过GetIconInfo and CreateIconIndirect两个函数来合成光标。完整代码如下:
public class CursorHelper
{
static class NativeMethods
{
public struct IconInfo
{
public bool fIcon;
public int xHotspot;
public int yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
[DllImport("user32.dll")]
public static extern IntPtr CreateIconIndirect(ref IconInfo icon);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
}
public static Cursor CreateCursor(Bitmap bmp, int xHotSpot, int yHotSpot)
{
var icon = new NativeMethods.IconInfo
{
xHotspot = xHotSpot,
yHotspot = yHotSpot,
fIcon = false
};
NativeMethods.GetIconInfo(bmp.GetHicon(), ref icon);
return new Cursor(NativeMethods.CreateIconIndirect(ref icon));
}
}
测试代码为:
using (Bitmap bitmap = new Bitmap(21, 26))
using (Graphics g = Graphics.FromImage(bitmap))
{
g.DrawRectangle(Pens.Red, 0, 0, 20, 25);
this.Cursor = CursorHelper.CreateCursor(bitmap, 3, 3);
}
WPF程序
至于WPF程序,和WinForm程序是非常类似的,一方面,它也可以通过光标文件来实现写入Cursor属性来自定义光标文件。
至于自己绘制光标,上面的代码基本上也是可以复用的,不过相对的要重新封装一下,完整代码如下:
public class CursorHelper
{
static class NativeMethods
{
public struct IconInfo
{
public bool fIcon;
public int xHotspot;
public int yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
[DllImport("user32.dll")]
public static extern SafeIconHandle CreateIconIndirect(ref IconInfo icon);
[DllImport("user32.dll")]
public static extern bool DestroyIcon(IntPtr hIcon);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
}
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
class SafeIconHandle : SafeHandleZeroOrMinusOneIsInvalid
{
public SafeIconHandle()
: base(true)
{
}
protected override bool ReleaseHandle()
{
return NativeMethods.DestroyIcon(handle);
}
}
static Cursor InternalCreateCursor(System.Drawing.Bitmap bitmap, int xHotSpot, int yHotSpot)
{
var iconInfo = new NativeMethods.IconInfo
{
xHotspot = xHotSpot,
yHotspot = yHotSpot,
fIcon = false
};
NativeMethods.GetIconInfo(bitmap.GetHicon(), ref iconInfo);
var cursorHandle = NativeMethods.CreateIconIndirect(ref iconInfo);
return CursorInteropHelper.Create(cursorHandle);
}
public static Cursor CreateCursor(UIElement element, int xHotSpot = 0, int yHotSpot = 0)
{
element.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
element.Arrange(new Rect(new Point(), element.DesiredSize));
var renderTargetBitmap = new RenderTargetBitmap(
(int)element.DesiredSize.Width, (int)element.DesiredSize.Height,
96, 96, PixelFormats.Pbgra32);
renderTargetBitmap.Render(element);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
using (var memoryStream = new MemoryStream())
{
encoder.Save(memoryStream);
using (var bitmap = new System.Drawing.Bitmap(memoryStream))
{
return InternalCreateCursor(bitmap, xHotSpot, yHotSpot);
}
}
}
}
需要注意的是,由于使用的System.Drawing.BitMap,是需要引用System.Drawing.dll的
封装之后,是可以直接传入UIElement作为自绘制的光标的,得益于WPF的强大绘图功能,是可以非常容易的绘制漂亮的光标的。测试代码如下:
this.Cursor= CursorHelper.CreateCursor(new UserControl1());
到此这篇关于C#对桌面应用程序自定义鼠标光标的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持编程网。