如何获取方向键的按下？急！

wuxking 2003-10-27 04:58:14

如何获取方向键的按下？例如我按下 up 要求做 Edit1->SetFocus();
并且对于left right down 分别判断，如何进行？谢谢。

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wuxsun 2004-01-08

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利用KeyDown事件 VK_UP VK_DOWN VK_LEFT VK_RIGHT
就可以了。

guanshangming 2003-10-27

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Specifies the control that has focus on the form.

__property Controls::TWidgetControl* ActiveControl = {read
=FActiveControl, write=SetActiveControl, stored=IsForm};

Description

Use ActiveControl to get or set the control that has focus on the form. Only one control can have focus at a given time in an application.

If the form does not have focus, ActiveControl is the control on the form that will receive focus when the form receives focus.

Note: When focus shifts to another control, ActiveControl is updated before the OnExit event occurs.

wuxking 2003-10-27

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qiuafa() ：

如果在form上面获取KeyDown，那么我如何知道当前tab在哪个控件（class）上面？就是哪个对象是得到focus的？谢谢。

我不懂电脑 2003-10-27

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void __fastcall TForm1::Button1KeyDown(TObject *Sender, WORD &Key,
TShiftState Shift)
{
if (Key == VK_UP) {
}
}

wuxking 2003-10-27

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我在Edit1 里面按下方向键，如何让Edit2->SetFocus() ？

不是在Form上面，谢谢！

yayowd 2003-10-27

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设置Form的属性KeyPreview为true；然后处理FormKeyDown事件，就可以在任何时候响应方向键了！

qiuafa 2003-10-27

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void __fastcall TForm1::FormShortCut(TWMKey &Msg, bool &Handled)
{
switch (Msg.CharCode)
{
case VK_UP : Edit1->SetFocus(); break;
case VK_DOWN : break;

}
}

semitone 2003-10-27