我有一个PictureBox,可在其中使用以下代码移动对象.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
像Form.Load()上的PictureBox.Focus()和PictureBox.Select()之类的方法,并在此答案here上完全禁用箭头键导航,但我的对象将不再移动.
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方向键导航,而又不影响UpdateScreen()中的代码?
解决方法:
PictureBox控件是不可选择的,因此无法处理键盘事件.要解决此问题,您首先应该使控件成为可选择的:
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:
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;
}
}