如何将图片框与列表框箭头键？ [英] How to move picturebox with arrow keys with listbox?

问题描述

每个事情是确定的Form1中+ picturebox1我可以用很好跌破codeS：

Every things is ok form1+picturebox1 i can use good below codes:

   public Form1()
        {
            InitializeComponent();
            KeyDown += new KeyEventHandler(Form1_KeyDown);
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            int x = pictureBox1.Location.X;
            int y = pictureBox1.Location.Y;

            if (e.KeyCode == Keys.Right) x += 5;
            else if (e.KeyCode == Keys.Left) x -= 5;
            else if (e.KeyCode == Keys.Up) y -= 5;
            else if (e.KeyCode == Keys.Down) y += 5;

            pictureBox1.Location = new Point(x, y);

        }

但; 如果我添加列表框编写位置PictureBox的，我不能移动图片框与箭头键我怎么能做到这一点？

BUT; if i add listbox to write position picturebox, i can not move picturebox with arrow keys how can i do that?

推荐答案

Probalby您的列表框获得焦点的不是形式，你可能要听的listboxs KEYDOWN事件。

Probalby your listbox gets the focus an not the form, you probably have to listen the listboxs keydown-event.

编辑：

使用这种可聚焦PictureBoxEx，听其previewkeydown事件：

Use this focusable PictureBoxEx and listen to its previewkeydown-event :

public class PictureBoxEx : PictureBox
{
    public PictureBoxEx()
    {
        this.SetStyle(ControlStyles.Selectable, true);
    }

    protected override void OnClick(EventArgs e)
    {
        this.Focus();
        base.OnClick(e);
    }
}

编辑：

或使用以下。有了这个，你不必在移动形式的控制，而只是将图像的控制范围之内。

Or use the following. with this you don't have to move a control in the form, but just move the image within the control.

public class PictureBoxEx : Control
    {
        public PictureBoxEx()
        {
            this.SetStyle(ControlStyles.Selectable | ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer, true);


        }


        protected override void OnClick(EventArgs e)
        {
            this.Select();
            base.OnClick(e);
        }

        private Image _Image;
        public Image Image
        {
            get
            {
                return _Image;
            }
            set
            {
                _Image = value;
                this.Invalidate();
            }
        }

        private Point _ImageLocation = new Point(0,0);
        public Point ImageLocation
        {
            get
            {
                return _ImageLocation;
            }
            set
            {
                _ImageLocation = value;
                this.Invalidate();
            }
        }

        private int _ImageLocationLeft = 0;
        public int ImageLocationLeft
        {
            get
            {
                return _ImageLocationLeft;
            }
            set
            {
                _ImageLocationLeft = value;
                ImageLocation = new Point(value, ImageLocationTop);
            }
        }

        private int _ImageLocationTop = 0;
        public int ImageLocationTop
        {
            get
            {
                return _ImageLocationTop;
            }
            set
            {
                _ImageLocationTop = value;
                ImageLocation = new Point(ImageLocationLeft, value);
            }
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            if (Image != null)
            {
                pe.Graphics.DrawImage(Image, ImageLocation);
            }
            base.OnPaint(pe);
        }

        protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)
        {
            if (e.KeyData == Keys.Up || e.KeyData == Keys.Down || e.KeyData == Keys.Left || e.KeyData == Keys.Right)
            e.IsInputKey = true;
            base.OnPreviewKeyDown(e);
        }
    }

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