通过

Glyph.GetHitTest(Point) 方法

  • 参考

定义

命名空间:
System.Windows.Forms.Design.Behavior
程序集:
System.Design.dll
程序集:
System.Windows.Forms.Design.dll

提供命中测试逻辑。

public:
 abstract System::Windows::Forms::Cursor ^ GetHitTest(System::Drawing::Point p);
public abstract System.Windows.Forms.Cursor GetHitTest (System.Drawing.Point p);
public abstract System.Windows.Forms.Cursor? GetHitTest (System.Drawing.Point p);
abstract member GetHitTest : System.Drawing.Point -> System.Windows.Forms.Cursor
Public MustOverride Function GetHitTest (p As Point) As Cursor

参数

p
Point

要进行命中测试的点。

返回

Cursor

如果 Cursor 与 p 关联，则为 Glyph；否则为 null。

示例

以下示例演示如何重写 GetHitTest 以查看点是否在此字形中。 此代码示例是为 BehaviorService 类提供的一个更大示例的一部分。

public:
    virtual Cursor^ GetHitTest(Point p) override
    {
        // GetHitTest is called to see if the point is
        // within this glyph.  This gives us a chance to decide
        // what cursor to show.  Returning null from here means
        // the mouse pointer is not currently inside of the
        // glyph.  Returning a valid cursor here indicates the
        // pointer is inside the glyph, and also enables our
        // Behavior property as the active behavior.
        if (Bounds.Contains(p))
        {
            return Cursors::Hand;
        }
        return nullptr;
    }

public override Cursor GetHitTest(Point p)
{
    // GetHitTest is called to see if the point is
    // within this glyph.  This gives us a chance to decide
    // what cursor to show.  Returning null from here means
    // the mouse pointer is not currently inside of the glyph.
    // Returning a valid cursor here indicates the pointer is
    // inside the glyph, and also enables our Behavior property
    // as the active behavior.
    if (Bounds.Contains(p))
    {
        return Cursors.Hand;
    }

    return null;
}

Public Overrides Function GetHitTest(ByVal p As Point) As Cursor
    ' GetHitTest is called to see if the point is
    ' within this glyph.  This gives us a chance to decide
    ' what cursor to show.  Returning null from here means
    ' the mouse pointer is not currently inside of the glyph.
    ' Returning a valid cursor here indicates the pointer is
    ' inside the glyph,and also enables our Behavior property
    ' as the active behavior.
    If Bounds.Contains(p) Then
        Return Cursors.Hand
    End If

    Return Nothing

End Function

注解

方法是 GetHitTest 强制 abstract 实现提供命中测试逻辑的方法 Glyph 。 给定任何点，如果 Glyph 已决定与该位置相关，则需要返回有效的 Cursor。 否则，返回 null 将导致 BehaviorService 忽略位置。

适用于

另请参阅