使用箭头键移动PictureBox-处理PictureBox中的键盘事件 [英] Move PictureBox using Arrow Keys - Handle keyboard events in PictureBox

问题描述

我有一个PictureBox，使用下面的代码移动对象.我需要在表单中添加一些按钮，但是，当我启动程序时，箭头键会在按钮中导航，而不是在输入按键中导航.我已经尝试了很多 Form.Load()上的PictureBox.Focus()和PictureBox.Select()之类的方法，并在此处上完全禁用此答案上的箭头键导航，但是对象将不再移动.

I have a PictureBox where I use the code below to move my object. I need to add a few buttons in the form, however when I start the program the arrow keys navigate through the buttons instead of my input keypresses. I've tried many ways like PictureBox.Focus() and PictureBox.Select() on Form.Load(), and disabling the arrow key navigation completely on this answer here, but my object will not move anymore.

private void UpdateScreen(object sender, EventArgs e) {

    if (Input.KeyPressed(Keys.Right) && Settings.direction != Direction.Left) {
        Settings.direction = Direction.Right;
    }
    else if (Input.KeyPressed(Keys.Left) && Settings.direction != Direction.Right) {
        Settings.direction = Direction.Left;
    }  
    else if (Input.KeyPressed(Keys.Up) && Settings.direction != Direction.Down) {
        Settings.direction = Direction.Up;
    }
    else if (Input.KeyPressed(Keys.Down) && Settings.direction != Direction.Up) {
        Settings.direction = Direction.Down;
    }
}

如何仅禁用所有按钮的箭头键导航，而又不影响UpdateScreen()中的代码?

How do I just disable the arrow key navigation for all my buttons without affecting my code in UpdateScreen()?

推荐答案

PictureBox控件不是Selectable，因此无法处理键盘事件.要解决此问题，您首先应该使控件变为可选:

PictureBox control is not Selectable and therefore it can not handle Keyboard events. To solve the problem, you should first make the control selectable:

using System;
using System.Windows.Forms;
class SelectablePictureBox : PictureBox
{
    public SelectablePictureBox()
    {
        SetStyle(ControlStyles.Selectable, true);
        SetStyle(ControlStyles.UserMouse, true);
        TabStop = true;
    }

    protected override void OnEnter(EventArgs e)
    {
        base.OnEnter(e);
        this.Invalidate();
    }
    protected override void OnLeave(EventArgs e)
    {
        base.OnLeave(e);
        this.Invalidate();
    }
    protected override void OnPaint(PaintEventArgs pe)
    {
        base.OnPaint(pe);
        if (this.Focused)
            ControlPaint.DrawFocusRectangle(pe.Graphics, ClientRectangle);
    }
}

然后您可以处理它的PreviewKeyDown事件:

Then you can handle PreviewKeyDown event of it:

private void selectablePictureBox1_PreviewKeyDown(object sender,
    PreviewKeyDownEventArgs e)
{
    if (e.KeyCode == Keys.Left)
    {
        e.IsInputKey = true;
        myPictureBox1.Left -= 10;
    }
    else if (e.KeyCode == Keys.Right)
    {
        e.IsInputKey = true;
        myPictureBox1.Left += 10;
    }
}

这篇关于使用箭头键移动PictureBox-处理PictureBox中的键盘事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！