使用按键移动图片 [英] Move pictures using keys

问题描述

我想基于按键来移动图片.
你能告诉我一种优雅的方法吗?


建议一种在应用程序运行时选择控件(例如Picturebox)的方法.
例如-我想使用鼠标拖动图片.

I want to move my pictures in the form based on key pressing .
Can you tell me an elegant way of doing it.


Suggest a way of selecting a control (eg Picturebox) when application is running.
For eg.-- i want to drag the picture in the form using mouse.

推荐答案

重要的是使用KeyDown事件，而不是KeyPress :

It''s important to use KeyDown event, not KeyPress:

MyControl.KeyDown += (sender, eventArgs) => {
    switch switch (eventArgs.KeyCode) {
        case Keys.Left: Image.Left -= step; break;
        case Keys.Right: Image.Left += step; break;
        case Keys.Up: Image.Top -= step; break;
        case Keys.Down: Image.Top += step; break;
    }
}

检查eventArgs.Modifiers并根据是否按下Alt，Control或Shift选择不同的step也是很好的选择.

—SA

It''s also can be good to check up eventArgs.Modifiers and choose different step depending on if Alt, Control or Shift is pressed.

—SA

处理键事件，根据需要移动.

Handle key event, move as necessary.

private void onKey(object sender, KeyEventArgs e)
{
  switch(e.KeyCode)
  {
     case Keys.Left:
        img.Left++;
        break;
     case Keys.Up:
       img.Top++;
       break;

    ...
  }
}

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