系统有很多光标类型 ：Cursors 类 (System.Windows.Input) | Microsoft Docs
本章介绍如何自定义光标、并动态切换光标类型。
动态切换光标类型
以白板书写为例：鼠标操作时,Cursor为红点；触摸时，Cursor为空；
public MainWindow()
{
InitializeComponent();
MouseEnter += (s, e) =>
{
ShowMouseCursor(e);
};
MouseMove += (s, e) =>
{
ShowMouseCursor(e);
};
StylusMove += (s, e) =>
{
ShowNoneCursor();
};
}设置光标显示：
private void ShowNoneCursor()
{
if (Cursor == Cursors.None)
{
return;
}
Cursor = Cursors.None;
Mouse.UpdateCursor();
}
private void ShowMouseCursor(MouseEventArgs e)
{
if (e.StylusDevice != null && e.StylusDevice.Id > -1)
{
return;
}
if (Cursor == GetFillCursor())
{
return;
}
Cursor = GetFillCursor();
Mouse.UpdateCursor();
}
private Cursor _fillCursor = null;
private Cursor GetFillCursor()
{
return _fillCursor ?? (_fillCursor = CursorHelper.CreateFillCursor());
}触摸书写时，会有个默认光标，所以此处把触摸时的光标置空Cursors.None。
Mouse.UpdateCursor()能强制更新光标。当然，不调用这个更新方法肉眼其实也看不出啥。。。
光标切换效果如上，前面一段是用鼠标书写，后面是触摸书写，光标类型有切换。红点光标自定义方案见下方。
自定义光标
自定义一个纯色的圆形光标：
public static Cursor CreateFillCursor(int size = 24, Brush fillBrush = null)
{
int unitSize = size / 4;
var bmp = new Bitmap(size, size);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clip = new Region(new Rectangle(0, 0, size, size));
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
using (var pen = new Pen(fillBrush ?? Brushes.Red, unitSize))
{
g.DrawEllipse(pen, new Rectangle(unitSize, unitSize, unitSize, unitSize));
}
}
return BitmapCursor.CreateBmpCursor(bmp);
}也可以通过图片资源BitmapSource来生成光标：
public static Cursor CreateFromBitmapSource(BitmapSource source)
{
var bitmap = BitmapSourceToBitmap(source);
return BitmapCursor.CreateBmpCursor(bitmap);
}
private static Bitmap BitmapSourceToBitmap(BitmapSource source)
{
using (var stream = new MemoryStream())
{
var e = new BmpBitmapEncoder();
e.Frames.Add(BitmapFrame.Create(source));
e.Save(stream);
var bmp = new Bitmap(stream);
return bmp;
}
}BitmapCursor:
internal class BitmapCursor : SafeHandle
{
public override bool IsInvalid => handle == (IntPtr)(-1);
public static Cursor CreateBmpCursor(Bitmap cursorBitmap)
{
var c = new BitmapCursor(cursorBitmap);
return CursorInteropHelper.Create(c);
}
protected BitmapCursor(Bitmap cursorBitmap)
: base((IntPtr)(-1), true)
{
handle = cursorBitmap.GetHicon();
}
protected override bool ReleaseHandle()
{
bool result = DestroyIcon(handle);
handle = (IntPtr)(-1);
return result;
}
[DllImport("user32")]
private static extern bool DestroyIcon(IntPtr hIcon);
}到此这篇关于C#实现自定义光标并动态切换的文章就介绍到这了,更多相关C#光标内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
