Question

我正在编写一个简单的Win32程序，该程序具有带复选框和启用多行选择的ListView。：

似乎复选框检查和行选择是两种不同的行为。有没有办法同步这两种行为，每当选中一个复选框时，将选择该行，每当选中一行时，将检查相应的复选框？

Answer 1

“每当选择一行时，都会选中相应的复选框”

检查WM_NOTIFY和LVIS_SELECTED标志以检测用户何时选择行。并使用ListView_SetCheckState检查复选框：

BOOL CALLBACK DialogProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static HWND hListView;
    switch (msg)
    {
    case WM_INITDIALOG:
        hListView = GetDlgItem(hWnd, IDC_LIST1);
        break;

    case WM_NOTIFY:
    {
        NMHDR* header = (NMHDR*)lParam;
        NMLISTVIEW* nmlist = (NMLISTVIEW*)lParam;
        if (header && header->idFrom == IDC_LIST1 && header->code == LVN_ITEMCHANGED)
            if (nmlist->uNewState & LVIS_SELECTED)
                ListView_SetCheckState(hListView, nmlist->iItem, 1);
        break;
    }
    ...
}

“只要选中复选框，就会选中该行”

选中WM_NOTIFY和LVIS_STATEIMAGEMASK标志以检测何时选中复选框，然后使用ListView_SetItemState选择行。

这也可能导致递归调用，因为我们更改了响应复选框的行，并且我们更改了复选框以响应行选择。使用busy变量来停止递归调用。

case WM_NOTIFY:
    if (lParam)
    {
        NMHDR* header = (NMHDR*)lParam;
        NMLISTVIEW* nmlist = (NMLISTVIEW*)lParam;

        //use `busy` as a flag to prevent recursive calls:
        static BOOL busy = FALSE;
        if (!busy && header->hwndFrom == hListView && header->code == LVN_ITEMCHANGED)
        {
            busy = TRUE;
            if (nmlist->uNewState & LVIS_SELECTED)
            {
                //row has been selected => check the checkbox
                ListView_SetCheckState(hListView, nmlist->iItem, 1);
            }
            else if (nmlist->uNewState & LVIS_STATEIMAGEMASK)
            {
                //checkbox has been changed => select/unselect the row
                BOOL checked = ListView_GetCheckState(hListView, nmlist->iItem);
                ListView_SetItemState(hListView, nmlist->iItem,
                     checked ? LVIS_SELECTED : 0, LVIS_SELECTED);
            }
            busy = FALSE;
        }
    }
    break;

如何将ListView复选框与选择同步？（WIN32）

1 个答案: