如何仅垂直移动无边框表单

Question

我为学校项目创建了一个winform 应用程序。但在某些情况下，我想让用户仅通过拖动表单来垂直移动表单。

所以，我试过这个。

 private bool dragging = false;
 private Point pointClicked;
 private void Form1_MouseMove(object sender, MouseEventArgs e)
 {
     if (dragging)
     {
         Point pointMoveTo;
         pointMoveTo = this.PointToScreen(new Point(e.Y,e.Y));
         pointMoveTo.Offset(-pointClicked.X, -pointClicked.Y);
         this.Location = pointMoveTo;
     }
 }
 private void Form1_MouseDown(object sender, MouseEventArgs e)
 {
     dragging = true;
     pointClicked = new Point(e.X, e.Y);
 }
 private void Form1_MouseDown(object sender, MouseEventArgs e)
 {
     dragging = false;
 }

但它似乎不起作用。它在屏幕上移动窗体。那么，有没有办法将表单移动限制为垂直？

Answer 1

不应设置

this.Location ，而应仅设置 this.Location.Y 值：

this.Location = pointToMoveTo;

应该成为

this.Top = pointToMoveTo.Y;

您的原始代码更改了 X 和 Y 坐标，有效地执行了对角线移动。

Answer 2

尝试这样的事情：

public partial class Form1 : Form
{
    private bool dragging = false;
    private int pointClickedY;
    public Form1() {
        InitializeComponent();
    }
    private void Form1_MouseDown(object sender, MouseEventArgs e) {
        dragging = true;
        pointClickedY = e.Y;
    }
    private void Form1_MouseUp(object sender, MouseEventArgs e) {
        dragging = false;
    }
    private void Form1_MouseMove(object sender, MouseEventArgs e) {
        if (dragging) {
            int pointMoveToY = e.Y;
            int delta = pointMoveToY - pointClickedY;
            Location = new Point(Location.X, Location.Y + delta);
        }
    }
}