今天想做一个可编辑单元格的 listview，样式是 LVS_REPORT 与 LVS_EDITLABELS
网上搜索了一些相关资料，照葫芦画瓢写了一个，可测试的时候发现，当从第2列开始编辑的时候，第1列的内容就显示不出来。
网上搜索了一下，有一个网友和我遇到的问题一样： https://*.com/questions/8658128/subclassing-list-view-to-edit-only-its-subitems?rq=1
下面是他贴出来的代码：
WNDPROC wpOrigEditProc;
RECT rcSubItem; LRESULT CALLBACK WndProcEditList(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
switch (uMsg) {
case WM_WINDOWPOSCHANGING:
{
WINDOWPOS *pos = (WINDOWPOS*) lParam; pos->x = rcSubItem.left; // 定位 listview 编辑框的位置
pos->cx = rcSubItem.right;
}
break;
default:
return CallWindowProc(wpOrigEditProc, hWnd, uMsg, wParam, lParam);
}
return ;
} LRESULT CALLBACK WndProcList(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
static HWND hEdit;
static RECT rc;
static LVITEM lvI;
static unsigned char bEditing = ;
switch (uMsg) {
case WM_NOTIFY:
switch (((NMHDR*) lParam)->code) {
case NM_CLICK:
lvI.iItem = ((NMITEMACTIVATE*) lParam)->iItem;
lvI.iSubItem = ((NMITEMACTIVATE*) lParam)->iSubItem;
break;
case NM_DBLCLK:
SendMessage(hWnd, LVM_EDITLABEL, lvI.iItem, );
break;
case LVN_BEGINLABELEDIT:
{
char text[];
bEditing = ;
hEdit = (HWND) SendMessage(hWnd, LVM_GETEDITCONTROL, , );
rcSubItem.top = lvI.iSubItem;
rcSubItem.left = LVIR_LABEL;
SendMessage(hWnd, LVM_GETSUBITEMRECT, lvI.iItem, (long) &rcSubItem);
rcSubItem.right = SendMessage(hWnd, LVM_GETCOLUMNWIDTH, lvI.iSubItem, );
wpOrigEditProc = (WNDPROC) SetWindowLong(hEdit, GWL_WNDPROC, (long) WndProcEditList);
lvI.pszText = text;
lvI.cchTextMax = ;
SendMessage(hWnd, LVM_GETITEMTEXT, lvI.iItem, (long) &lvI);
SetWindowText(hEdit, lvI.pszText);
}
break;
case LVN_ENDLABELEDIT:
bEditing = ;
SetWindowLong(hEdit, GWL_WNDPROC, (long) wpOrigEditProc);
if (!lvI.iSubItem) return ;
lvI.pszText = ((NMLVDISPINFO*) lParam)->item.pszText;
if (!lvI.pszText) return ;
SendMessage(hWnd, LVM_SETITEMTEXT, lvI.iItem, (long) &lvI);
break;
default:
return CallWindowProc((WNDPROC) GetClassLong(hWnd, GCL_WNDPROC), hWnd, uMsg, wParam, lParam);
}
break;
case WM_PAINT:
if (bEditing) {
RECT rcItem;
if (lvI.iSubItem > ) {
rcItem.left = LVIR_LABEL;
if (SendMessage(hWnd, LVM_GETITEMRECT, lvI.iItem, (long) &rcItem))
ValidateRect(hWnd, &rcItem);
}
}
default:
return CallWindowProc((WNDPROC) GetClassLong(hWnd, GCL_WNDPROC), hWnd, uMsg, wParam, lParam);
}
return ;
} LRESULT CALLBACK WndProcMain(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
static HWND hList;
static RECT rc;
switch (uMsg) {
case WM_NOTIFY:
switch (((NMHDR*) lParam)->code) {
case NM_CLICK:
case NM_DBLCLK:
case LVN_BEGINLABELEDIT:
case LVN_ENDLABELEDIT:
return CallWindowProc(WndProcList, ((NMHDR*) lParam)->hwndFrom, uMsg, wParam, lParam);
}
break;
case WM_CREATE:
{
LVCOLUMN lvc;
LVITEM lvI;
unsigned int i;
float vertex;
char text[]; hList = CreateWindow(WC_LISTVIEW, , WS_CHILD | WS_VISIBLE | LVS_REPORT | LVS_EDITLABELS, rc.left, rc.top, rc.right, rc.bottom, hWnd, , hInstance, );
SendMessage(hList, LVM_SETEXTENDEDLISTVIEWSTYLE, , LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES);
SetWindowLong(hList, GWL_WNDPROC, (long) WndProcList); lvc.mask = LVCF_WIDTH;
lvc.cx = ;
SendMessage(hList, LVM_INSERTCOLUMN, , (LPARAM) &lvc); lvc.mask = LVCF_TEXT;
lvc.pszText = "Vertex";
SendMessage(hList, LVM_INSERTCOLUMN, , (LPARAM) &lvc);
SendMessage(hList, LVM_SETCOLUMNWIDTH, , LVSCW_AUTOSIZE_USEHEADER); lvI.mask = LVIF_TEXT;
lvI.pszText = text; for (i = ; i < ; i++) {
vertex = (float) i;
lvI.iItem = i;
lvI.iSubItem = ;
sprintf(text, "%d", i);
SendMessage(hList, LVM_INSERTITEM, , (LPARAM) &lvI);
lvI.iSubItem = ;
sprintf(text, "%f, %f, %f", vertex - , vertex, vertex + );
SendMessage(hList, LVM_SETITEM, , (LPARAM) &lvI);
}
}
break;
case WM_SIZE:
GetClientRect(hWnd, &rc);
MoveWindow(hList, rc.left, rc.top, rc.right, rc.bottom, );
SendMessage(hList, LVM_SETCOLUMNWIDTH, , LVSCW_AUTOSIZE_USEHEADER);
break;
case WM_DESTROY:
PostQuitMessage();
break;
default:
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
return ;
}
至于为什么当编辑第2,3,... 列时，当前行的第1列的内容不显示的原因，我还是没找到。
不过我找到了一个解决办法： 就是给 listview 添加一个空白列, 宽度设置为 0
lvc.mask = LVCF_TEXT | LVCF_WIDTH | LVCF_FMT;
lvc.pszText = "";
lvc.cx = 0; //宽度设置为 0
lvc.fmt = LVCFMT_CENTER;
这也是不是办法的办法了，反正我没有更好的解决方案。