在 Form 中有好幾個物件,如 Button, Edit, ListBox ..等,按TAB鍵會切換物件, 要如何知道目前切到哪個物件呢?

1.FORM的KeyPreview設定為true.
2.在On Keydown裡面攔截 VK_TAB.
3.以 this->ActiveControl 找出目前具有 focus 的子物件。

TabOrder 有 0~15 , 按 Tab 鍵為 0 ~10 循環 , 按另一個 button 只要 0,1,2,7,11,0,1,2,7,11,0 ..... 循環 ,要如何做呢?

目前作法
switch(Tab_Count)
{
case 0: this->ActiveControl->TabOrder = 0;
break;
case 1: this->ActiveControl->TabOrder = 1;
break;
case 2: this->ActiveControl->TabOrder = 6;
break;
case 3: this->ActiveControl->TabOrder = 10;
break;
case 4: this->ActiveControl->TabOrder = 15;
break;
}
if(Tab_Count == 4)
Tab_Count = 0;
else
Tab_Count ;
Perform(WM_NEXTDLGCTL,0,0);

執行結果: 0,1,2,7,11,0,1,2,8,11,0,1,2,9,11 .......