创建列表视图后无法更改其列宽

Question

在将一些项目添加到列表视图后，我需要使用 win32 api 更改列宽，因为垂直滚动条的宽度会导致显示水平滚动条，我想将其删除。

但ListView_SetColumnWidth() 不会改变列宽。

//Column
int CreateColumn(HWND hwndLV, int iCol, char* Text, int iBreite)
{

LVCOLUMN lvc;

lvc.mask = LVCF_FMT | LVCF_WIDTH | LVCF_TEXT ;
lvc.fmt=LVCFMT_LEFT;
lvc.cx = iBreite;
lvc.pszText =(LPWSTR)Text;  
lvc.iSubItem = iCol;

return ListView_InsertColumn(hwndLV, iCol, &lvc);
}

//item
int CreateItem(HWND hwndList, char*  Text)
{ 
 LVITEM lvi = {0};

 lvi.mask = LVIF_TEXT | LVCFMT_LEFT;
 lvi.pszText = (LPWSTR)Text;

 return ListView_InsertItem(hwndList, &lvi);
} 

 //Some code ...
 hwndList = CreateWindow(WC_LISTVIEW , L"" ,  WS_VISIBLE | WS_CHILD | LVS_REPORT | WS_BORDER  | WS_VSCROLL , 10 , 10 ,300 , 200, hwnd, NULL, GetModuleHandle(NULL), 0); 

 SendMessage(hwndList,LVM_SETEXTENDEDLISTVIEWSTYLE,LVS_EX_FULLROWSELECT,LVS_EX_FULLROWSELECT); 
 GetClientRect(hwndList , &rect);
 CreateColumn(hwndList , 0 , (char*)L"HEADER" , rect.right );

//Some other codes for adding items here

 ListView_SetColumnWidth(hwndList, 0,200); //Does not change the width

如何更改列的宽度？

Answer 1

对于初学者，您应该如下更改您的两个“创建”函数（第二个与您的代码有很大不同）：

//Column
int CreateColumn(HWND hwndLV, int iCol, const wchar_t* Text, int iBreite)
{
    LVCOLUMN lvc;
    lvc.mask = LVCF_FMT | LVCF_WIDTH | LVCF_TEXT | LVCF_SUBITEM; // You set iSubItem
    lvc.fmt = LVCFMT_LEFT;
    lvc.cx = iBreite;
    lvc.pszText = const_cast<wchar_t*>(Text);
    lvc.iSubItem = iCol;
    return ListView_InsertColumn(hwndLV, iCol, &lvc);
}

//item
int CreateItem(HWND hwndList, wchar_t* Text, int nItem) // Must have an item ID!
{
    LVITEM lvi; // Don't set to { 0, } as you immediately overwrite first item ...
    lvi.mask = LVIF_TEXT; // LVCFMT_LEFT is just plain wrong, here!
    lvi.pszText = Text;
    lvi.iItem = nItem;    // Must set this value;
    lvi.iSubItem = 0;
    return ListView_InsertItem(hwndList, &lvi);
}

您没有向我们展示添加项目的代码，但您需要为每个调用提供一个递增的nItem 值。否则，您的商品将以相反的顺序显示！

我还假设您将非常量（即不是字符串文字）传递给 CreateItem。如果不是，则更改它，使其在处理Text 的方式上类似于CreateColumn。

希望这会有所帮助！