Question

我创建了一个编辑框和一个列表框。当它们重叠时，列表框位于顶部，当鼠标光标位于覆盖编辑框部分的列表框部分上方时，鼠标光标将变为工字形光标，并显示编辑框的轮廓：

鼠标悬停之前：

鼠标悬停后：

用于创建控件的代码：

    HWND hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, WC_EDIT, "xxx", WS_CHILD | WS_VISIBLE| ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,
        50, 100, 200, 100, hWnd, (HMENU)IDC_MAIN_EDIT, GetModuleHandle(NULL), NULL);

    HWND hList = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTVIEW, _T(""), WS_VISIBLE | WS_CHILD | LVS_REPORT | LVS_EDITLABELS,
        70, 150, 200, 100, hWnd, (HMENU)ID_LIST_VIEW, GetModuleHandle(NULL), NULL);

我尝试使用SetWindowPos摆弄x顺序，但它并没有改变行为。无论如何，我认为控制订单的创建应该将列表框放在编辑控件之上。

为什么要这样做，更重要的是，如何修复它以便编辑保持覆盖？

要重现，请在VS2015中创建一个win32项目。将以上2行添加到WM_CREATE以及相应的包含定义等等。这几乎就是它。以下代码没有添加任何项目listview。

更新：根据大众需求，这里是完整的代码：

#include "stdafx.h"
#include "Win32Project3.h"
#include <commctrl.h>

#define MAX_LOADSTRING 100
#define IDC_MAIN_EDIT   140
#define ID_LIST_VIEW 143

#pragma comment( lib, "comctl32.lib")
#pragma comment(linker, "\"/manifestdependency:type='Win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                 _In_opt_ HINSTANCE hPrevInstance,
                 _In_ LPWSTR    lpCmdLine,
                 _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_WIN32PROJECT3, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    HACCEL hAccelTable = LoadAccelerators(hInstance,MAKEINTRESOURCE(IDC_WIN32PROJECT3));

    MSG msg;

    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
    return (int) msg.wParam;
}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW wcex;
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WIN32PROJECT3));
    wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_WIN32PROJECT3);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassExW(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   hInst = hInstance; // Store instance handle in our global variable
   HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
  CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
    {
        HWND hList = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTBOX, _T(""), WS_VISIBLE | WS_CHILD | LVS_REPORT | LVS_EDITLABELS,
        70, 150, 200, 100, hWnd, (HMENU)ID_LIST_VIEW, GetModuleHandle(NULL),NULL);

        HWND hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, WC_EDIT, _T("xxx"), WS_VISIBLE | WS_CHILD | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,
        50, 100, 200, 160, hWnd, (HMENU)IDC_MAIN_EDIT, GetModuleHandle(NULL), NULL);
    }
    case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_ABOUT:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
                break;
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
            EndPaint(hWnd, &ps);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

Answer 1

效果是由一个控件渲染到另一个控件的客户区域引起的，因为它正在处理WM_PAINT个消息。

为了防止这种情况发生，需要剪裁渲染，以便排除其他控件占用的区域。在控件上设置WS_CLIPSIBLINGS window style会指示系统应用适当的剪切区域：

将儿童窗户相对夹住;也就是说，当特定子窗口收到WM_PAINT消息时， WS_CLIPSIBLINGS 样式会剪切要更新的子窗口区域之外的所有其他重叠子窗口。如果未指定 WS_CLIPSIBLINGS 且子窗口重叠，则在子窗口的客户区域内绘制时，可以在相邻子窗口的客户区域内绘制。

如何防止编辑控件在被另一个控件覆盖时显示？

1 个答案: