Question

case 1 : I have a MFC dialog box having a LisBox.
I have added two items in listbox.
Whenever i am double clicking on empty area of list box i.e. not double clicking 
on either of two item. 
Double click is detecting on empty area of listbox.

case 2: When i created a small MFC test application with listbox. it iis detecting double click only on item, not on empty area.
I compared all properties of both cases but couldn't figure out what is the problem.

Anyone has idea what is going wrong in case 1.

Answer 1

我认为这是异常过程。我已经在 VS2010 中测试了您的情况。在我的MFC测试应用程序中，当我双击空白区域时发送了LBN_DBLCLK。如果你真的不想知道这种情况的原因，你可以检查是否在空白区域发生了双击事件。我认为这是节省时间的更好方法。

void CMfcDlgTestDlg::OnLbnDblclkList2()
{
    // TODO: Add your control notification handler code here
    CListBox* list =  (CListBox*)(GetDlgItem(IDC_LIST2));
    int cur_sel = list->GetCurSel();
    if (cur_sel == -1)
    {
        return;
    }
}

编辑：另一种情况 当已经选择了一个列表框项目时，它如何处理ON_LBN_DBLCLK处理程序？我认为会有一些可用的方法来解决这个问题，但是我使用下面的代码并且它也是有用的方法。

void CMfcDlgTestDlg::OnLbnDblclkList2()
{
    // TODO: Add your control notification handler code here

    CListBox* list =  (CListBox*)(GetDlgItem(IDC_LIST2));

    CPoint cursor;
    cursor.x = GetCurrentMessage()->pt.x;
    cursor.y = GetCurrentMessage()->pt.y;

    list->ScreenToClient(&cursor);

    BOOL is_outside = FALSE;
    UINT item_index = list->ItemFromPoint(cursor, is_outside);

    if(is_outside)
    {
        //mouse clicked on empty area
        return ;
    }
    else
    {
        // do something with 'item_index'

    }

}

我希望这对你有所帮助。

为什么在mfc中对listBox的空白区域进行双击事件检测

1 个答案: