如何在运行时在mousemove上移动控件？

问题描述

我有一个WinForm应用程序，我正在尝试使用 MouseMove事件在窗体中移动pictureBox，但是我不知道该怎么计算？在MouseMove上执行操作时，当我第一次使用pictureBox时，其位置会以无意义的方式更改，然后在移动pictureBox时位置会正确移动。

I have a WinForm application, I'm trying to move a pictureBox in a Form using MouseMove Event, but i can't figure out what's the right calculation should i do on MouseMove, when i first the pictureBox , its location changes in a senseless way then on moving the pictureBox Location moves correctly.

这是面板名称 OuterPanel ，其中包含pictureBox picBox ，此处的代码im使用：

It's a Panel name OuterPanel which contains the pictureBox picBox, here the code im using :

private void picBox_MouseMove(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        Point p = OuterPanel.PointToClient(MousePosition);
        picBox.Location = this.PointToClient(p);
    }
}

PS：目标是在放大后移动图像，像Windows照片查看器

P.S : the goal is moving image after zooming in, like windows photo viewer

更新： ConvertFromChildToForm 方法

private Point ConvertFromChildToForm(int x, int y,Control control)
{
    Point p = new Point(x, y);
    control.Location = p;
    return p;
}

推荐答案

您必须管理三个事件使其正确完成：

You have to Manage three Events to get it done correctly :

• MouseDown


• MouseMove


• MouseUp

• MouseDown
• MouseMove
• MouseUp

picBox 的代码：

private void picBox_MouseDown(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Left)
    {
        Point p = ConvertFromChildToForm(e.X, e.Y, picBox);
        iOldX = p.X;
        iOldY = p.Y;
        iClickX = e.X;
        iClickY = e.Y;
        clicked = true;
    }
}

private void picBox_MouseMove(object sender, MouseEventArgs e)
{
    if (clicked)
    {
        Point p = new Point(); // New Coordinate
        p.X =  e.X + picBox.Left;
        p.Y =  e.Y + picBox.Top;
        picBox.Left = p.X - iClickX;
        picBox.Top = p.Y - iClickY;
    }
}

private void picBox_MouseUp(object sender, MouseEventArgs e)
{
    clicked = false;
}

private Point ConvertFromChildToForm(int x, int y, Control control)
{
    Point p = new Point(x, y);
    control.Location = p;
    return p;
}

ConvertFromChildToForm 方法

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