将“this”参数传递给另一个类

本文关键字：另一个 参数传递 this | 更新日期: 2023-09-27 18:32:24

假设，我的表单没有边框，我将制作一个图像将是一个自定义标题栏

我想创建调用标题栏的类，有一个方法应用标题栏（控件 c）;在项目中的任何表单中，只需调用 ApllyTitleBar（） 到表单上的任何控件，当鼠标按下和鼠标移动时，表单也会移动。

类标题栏中的代码：

public class TitleBar
{
    private bool drag = false; // determine if we should be moving the form
    private Point startPoint = new Point(0, 0);
    public void ApplyTitleBar(Control c)
    {
        c.MouseUp += new MouseEventHandler(panelTitleBar_MouseUp);
        c.MouseMove += new MouseEventHandler(panelTitleBar_MouseMove);
        c.MouseDown += new MouseEventHandler(panelTitleBar_MouseDown);
    }
    void panelTitleBar_MouseUp(object sender, MouseEventArgs e)
    {
        this.drag = false;
    }
    void panelTitleBar_MouseDown(object sender, MouseEventArgs e)
    {
        this.startPoint = e.Location;
        this.drag = true;
    }
    void panelTitleBar_MouseMove(object sender, MouseEventArgs e)
    {
        if (this.drag)
        { // if we should be dragging it, we need to figure out some movement
            Point p1 = new Point(e.X, e.Y);
            Point p2 = this.PointToScreen(p1);
            Point p3 = new Point(p2.X - this.startPoint.X,
                                 p2.Y - this.startPoint.Y);
            this.Location = p3;
        }
    }

}

假设在另一种形式中，我有标签 lblTitleBar 并希望它是一个"标题栏"

TitleBar tb=new TitleBar();
tb.Apply(lblTitleBar);
我知道类 TitleBar 中的"this"

参数不能有方法 Location（） 和 PointToScreen（），因为"this"是 TitleBar 的实例，而不是 Form 的实例。有没有另一种方法可以将类传递给这个，或者那个方法???

tb.Apply(lblTitleBar,this);

将“this”参数传递给另一个类

我认为你在这里追求的是对该形式的引用：

public class TitleBar
{
    private bool drag = false; // determine if we should be moving the form
    private Point startPoint = new Point(0, 0);
    private Form form;
    public void ApplyTitleBar(Control c, Form f)
    {
        c.MouseUp += new MouseEventHandler(panelTitleBar_MouseUp);
        c.MouseMove += new MouseEventHandler(panelTitleBar_MouseMove);
        c.MouseDown += new MouseEventHandler(panelTitleBar_MouseDown);
        this.form = f;
    }
    ....

然后稍后你可以这样做：

void panelTitleBar_MouseMove(object sender, MouseEventArgs e)
{
    if (this.drag)
    { // if we should be dragging it, we need to figure out some movement
        Point p1 = new Point(e.X, e.Y);
        Point p2 = form.PointToScreen(p1);
        Point p3 = new Point(p2.X - form.startPoint.X,
                             p2.Y - form.startPoint.Y);
        form.Location = p3;
    }
}

而且，假设您从表单中实例化所有这些，您确实会这样称呼它：

tb.ApplyTitleBar(lblTitleBar,this);

您可以尝试检索包含目标控件的窗体。

void panelTitleBar_MouseMove(object sender, MouseEventArgs e)
{
    Control control = sender as Control;
    if(null != control)
    {
        Form form = control.FindForm();
        if(null != form)
        {
            if (this.drag)
            { // if we should be dragging it, we need to figure out some movement
                Point p1 = new Point(e.X, e.Y);
                Point p2 = form.PointToScreen(p1);
                Point p3 = new Point(p2.X - this.startPoint.X,
                                     p2.Y - this.startPoint.Y);
                form.Location = p3;
            }
        }
    }
}
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