我尝试向ListView
添加空标记,但是当我使用SetWindowTheme
或AutoResizeColumns
时,标记会消失。这是一个例子:
internal static class ExtensionMethods
{
public static void SetDoubleBuffered(this ListView listview, bool value)
{
PropertyInfo pi = typeof(ListView).GetProperty("DoubleBuffered", BindingFlags.NonPublic | BindingFlags.Instance);
pi.SetValue(listview, value);
}
public static void SetWindowTheme(this ListView listview, string pszSubAppName, string pszSubIdList)
{
NativeMethods.SetWindowTheme(listview.Handle, pszSubAppName, pszSubIdList);
}
}
internal static class NativeMethods
{
public const Int32 WM_NOTIFY = 0x004e;
public const Int32 WM_LBUTTONDBLCLK = 0x0203;
public const Int32 WM_USER = 0x0400;
public const UInt32 LVN_FIRST = unchecked(0u - 100u);
public const UInt32 LVN_GETEMPTYMARKUP = LVN_FIRST - 87;
public const Int32 L_MAX_URL_LENGTH = 2084;
[StructLayout(LayoutKind.Sequential)]
public struct NMHDR
{
public IntPtr hwndFrom;
public IntPtr idFrom;
public UInt32 code;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct NMLVEMPTYMARKUP
{
public NMHDR hdr;
public UInt32 dwFlags;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = L_MAX_URL_LENGTH)]
public String szMarkup;
}
[DllImport("uxtheme.dll", CharSet = CharSet.Unicode)]
public static extern Int32 SetWindowTheme(IntPtr hWnd, String pszSubAppName, String pszSubIdList);
}
public partial class MainForm : Form
{
private ListView listView1 = new ListView();
public MainForm()
{
InitializeComponent();
this.Controls.Add(listView1);
listView1.Dock = DockStyle.Fill;
listView1.View = View.Details;
listView1.Columns.Add("Test");
listView1.SetDoubleBuffered(true);
// listView1.SetWindowTheme("Explorer", null);
// listView1.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case NativeMethods.WM_NOTIFY:
var nmhdr = (NativeMethods.NMHDR)m.GetLParam(typeof(NativeMethods.NMHDR));
switch (nmhdr.code)
{
case NativeMethods.LVN_GETEMPTYMARKUP:
if (Control.FromHandle(nmhdr.hwndFrom) == listView1)
{
var markup = (NativeMethods.NMLVEMPTYMARKUP)m.GetLParam(typeof(NativeMethods.NMLVEMPTYMARKUP));
markup.szMarkup = "This is an empty ListView.";
Marshal.StructureToPtr(markup, m.LParam, false);
m.Result = new IntPtr(1);
return;
}
break;
}
break;
}
base.WndProc(ref m);
}
}
这很有效。但如果我取消注释任何一行
// listView1.SetWindowTheme("Explorer", null);
// listView1.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
空标记消失。如何在使用SetWindowTheme
和AutoResizeColumns
?
更新
我写了一个C版本的例子,它确认空标记可以与SetWindowTheme
和Win32级别的AutoResizeColumns
一起使用。但为什么不是C#?
#define _CRT_SECURE_NO_DEPRECATE
#define WIN32_LEAN_AND_MEAN
#define STRICT
#include <tchar.h>
#include <Windows.h>
#include <windowsx.h>
#include <CommCtrl.h>
#include <Uxtheme.h>
#pragma comment(lib, "uxtheme.lib")
#pragma comment(linker, "\"/manifestdependency:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
BOOL MainWindow_OnCreate(HWND hWnd, LPCREATESTRUCT lpCreateStruct);
void MainWindow_OnDestroy(HWND hWnd);
void MainWindow_OnSize(HWND hWnd, UINT state, int cx, int cy);
void MainWindow_OnPaint(HWND hWnd);
LRESULT MainWindow_OnNotify(HWND hWnd, int idFrom, LPNMHDR pnmhdr);
#define ID_LISTVIEW 100
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wcex = { 0 };
HWND hWnd;
BOOL ret;
MSG msg;
wcex.cbSize = sizeof(wcex);
wcex.lpfnWndProc = WindowProc;
wcex.hInstance = hInstance;
wcex.hIcon = (HICON)LoadImage(NULL, IDI_APPLICATION, IMAGE_ICON, 0, 0, LR_SHARED);
wcex.hCursor = (HCURSOR)LoadImage(NULL, IDC_ARROW, IMAGE_CURSOR, 0, 0, LR_SHARED);
wcex.lpszClassName = TEXT("MainWindow");
if (!RegisterClassEx(&wcex))
{
return 1;
}
hWnd = CreateWindow(wcex.lpszClassName, TEXT("Win32Test"), WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, HWND_DESKTOP, NULL, hInstance, NULL);
if (!hWnd)
{
return 1;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
while ((ret = GetMessage(&msg, NULL, 0, 0)) != 0)
{
if (ret == -1)
{
return 1;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
HANDLE_MSG(hWnd, WM_CREATE, MainWindow_OnCreate);
HANDLE_MSG(hWnd, WM_DESTROY, MainWindow_OnDestroy);
HANDLE_MSG(hWnd, WM_SIZE, MainWindow_OnSize);
HANDLE_MSG(hWnd, WM_PAINT, MainWindow_OnPaint);
HANDLE_MSG(hWnd, WM_NOTIFY, MainWindow_OnNotify);
default:
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
}
BOOL MainWindow_OnCreate(HWND hWnd, LPCREATESTRUCT lpCreateStruct)
{
HWND h_listview = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTVIEW, NULL, WS_CHILD | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, hWnd, (HMENU)ID_LISTVIEW, GetModuleHandle(NULL), NULL);
LVCOLUMN lvc = { 0 };
SetWindowTheme(h_listview, TEXT("Explorer"), NULL);
ListView_SetExtendedListViewStyle(h_listview, LVS_EX_DOUBLEBUFFER);
ListView_SetView(h_listview, LV_VIEW_DETAILS);
lvc.mask = LVCF_TEXT;
lvc.pszText = TEXT("Column 1");
ListView_InsertColumn(h_listview, 0, &lvc);
ListView_SetColumnWidth(h_listview, 0, LVSCW_AUTOSIZE_USEHEADER);
return TRUE;
}
void MainWindow_OnDestroy(HWND hWnd)
{
PostQuitMessage(0);
}
void MainWindow_OnSize(HWND hWnd, UINT state, int cx, int cy)
{
MoveWindow(GetDlgItem(hWnd, ID_LISTVIEW), 11, 11, cx - 22, cy - 22, TRUE);
}
void MainWindow_OnPaint(HWND hWnd)
{
PAINTSTRUCT ps;
BeginPaint(hWnd, &ps);
FillRect(ps.hdc, &ps.rcPaint, GetSysColorBrush(COLOR_3DFACE));
EndPaint(hWnd, &ps);
}
LRESULT MainWindow_OnNotify(HWND hWnd, int idFrom, LPNMHDR pnmhdr)
{
switch (pnmhdr->code)
{
case LVN_GETEMPTYMARKUP:
{
if (pnmhdr->hwndFrom == GetDlgItem(hWnd, ID_LISTVIEW))
{
NMLVEMPTYMARKUP *pmarkup = (NMLVEMPTYMARKUP *)pnmhdr;
_tcscpy(pmarkup->szMarkup, TEXT("This is an empty ListView."));
return TRUE;
}
return FORWARD_WM_NOTIFY(hWnd, idFrom, pnmhdr, DefWindowProc);
}
default:
return FORWARD_WM_NOTIFY(hWnd, idFrom, pnmhdr, DefWindowProc);
}
}
答案 0 :(得分:0)
我可以移动
listView1.SetWindowTheme("Explorer", null);
listView1.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
进入Form
的{{1}}事件。这有效,但我不知道为什么。
我也可以覆盖Load
,并将这两行移到OnHandleCreated
。我也不知道为什么。