如何在滑鼠懸停時繪制文本控制元件？-有解無憂

我在繪制靜態文本控制元件時遇到了麻煩。我對這件事做了一些閱讀，也嘗試了一些代碼，但都沒有奏效。我設法得到的最接近的是直到文本控制元件檢測到我的滑鼠懸停事件。為此，我使用控制元件子類化。但是，我不知道如何在滑鼠懸停時繪制文本控制元件。

我的問題是：

我很困惑是否將負責繪制文本控制元件的代碼放在子類中WM_MOUSEMOVE或WM_MOUSEHOVER子類中。原因是因為在WM_MOUSEMOVE，我設定了這樣當文本控制元件的矩形區域檢測到游標時，應該發生繪畫。同時，我覺得很奇怪，因為那個特定的角色不應該已經由WM_MOUSEHOVER嗎？
我真的需要關于如何在滑鼠懸停時突出顯示文本控制元件的幫助。

// global text control handler
HWND txtHwnd; //somewhere in the global area of codes

//class for mouse event tracking
class MouseTrackEvents
{
    bool m_bMouseTracking;

public:
    MouseTrackEvents() : m_bMouseTracking(false) {}

    void OnMouseMove(HWND hwnd)
    {
        if (!m_bMouseTracking)
        {
            // Enable mouse tracking.
            TRACKMOUSEEVENT tme;
            tme.cbSize = sizeof(tme);
            tme.hwndTrack = hwnd;
            tme.dwFlags = TME_HOVER;
            tme.dwHoverTime = 100; //0.1s
            TrackMouseEvent(&tme);
            m_bMouseTracking = true;
        }
    }
    void Reset(HWND hwnd)
    {
        m_bMouseTracking = false;
    }
};

//subclass proc for text control
LRESULT CALLBACK OwnerTxtProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData) {
    //local mouse track object
    MouseTrackEvents mouseTrack;

    const int numOfMsg = 4;
    int myMsgBox[numOfMsg]; //limit to only 4

    HBRUSH hbrBkgndA = CreateSolidBrush(RGB(0, 255, 0));

    //just want to print what wparam is..
    int wmId, wmEvent;

    wchar_t wParamHI[1000];
    wchar_t wParamLO[1000];

    //for painting
    COLORREF hbrHighlight;
    //HBRUSH hbrHighlight;
    HDC txtHDC;
    RECT txtRect;

    POINT txtPt;
    RECT txtRt;

    switch (uMsg) {
        case WM_CREATE: {
            //testing purposes
            myMsgBox[0] = MessageBox(nullptr, L"Yessir!", L":D", MB_OK | MB_ICONINFORMATION);
            break;
        }

        case WM_MOUSEMOVE: {
            mouseTrack.OnMouseMove(hWnd); //activate mouse tracking
            GetWindowRect(hWnd, &txtRt); //see what value lies within

            GetCursorPos(&txtPt);

            if (PtInRect(&txtRt, txtPt)) {
                //to check whether cursor is in text rect or not
                MessageBox(nullptr, L"Okea..nice..!", L":D", MB_OK | MB_ICONINFORMATION);

                //i dont know what to do here
                //i was thinking that painting should be placed here...
                //HBRUSH hbrBkgndEdit = CreateSolidBrush(RGB(100, 100, 255));
                
            }
            else {
                //to check whether cursor is in text rect or not
                MessageBox(nullptr, L"Oh noooo!", L":D", MB_OK | MB_ICONINFORMATION);
            }

            break;
        }

        case WM_MOUSEHOVER: {
            //do something when txt ctrl is hovered
            //to test whether wm_mousehover works, and the text control is mouse hovered
            //myMsgBox[1] = MessageBox(nullptr, L"Yahooooo!", L":D", MB_OK | MB_ICONINFORMATION);
            OutputDebugString(L"--------------This text control is being hovered---------------\n");

            //testing painting when hovered
            //plan is to send message to hChild to manage the painting since it is the parent window
            //HDC theHDC = (HDC)wParam;
            //SendMessage(hWnd, WM_CTLCOLORSTATIC, (WPARAM)theHDC, (LPARAM)txtHwnd);

            //SendMessage(hWnd, WM_CTLCOLORSTATIC, (WPARAM)theHDC, lParam);

            //for painting
            //hbrHighlight = (COLORREF)(GetSysColor(COLOR_HIGHLIGHT));
            //HDC hdcStatic = (HDC)wParam;
            ////SetTextColor(hdcStatic, RGB(0, 0, 0));
            //SetBkColor(hdcStatic, hbrHighlight);

            //for painting II
            //HDC txtCtrlMe = (HDC)wParam;


            //SetTextColor(txtCtrl, RGB(0, 0, 0));
            //SetBkColor(txtCtrlMe, RGB(0, 255, 0));

            //SendMessage(hChild, WM_CTLCOLORSTATIC, (WPARAM)txtCtrlMe, (LPARAM)txtHwnd);

            //DeleteBrush(hbrBkgndA);

            mouseTrack.Reset(hWnd);
            //return (INT_PTR)hbrHighlight;

            //mouseTrack.Reset(hWnd);
            break;
            //return TRUE;
        }

        //case WM_CTLCOLORSTATIC:
        //{
        //  HDC txtCtrlMe = (HDC)wParam;

        //  //SetTextColor(txtCtrl, RGB(0, 0, 0));
        //  SetBkColor(txtCtrlMe, RGB(0, 255, 0));

        //  if (hbrBkgndA == NULL)
        //  {
        //      hbrBkgndA = CreateSolidBrush(RGB(255, 255, 255)); //eqivalent to delete brush objet
        //  }
        //  return (INT_PTR)hbrBkgndA;
        //  //break;
        //}

        //painting
        /*
            SendMessage(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
            SendMessage(hChild, WM_CTLCOLORSTATIC, (WPARAM)txtCtrlMe, (LPARAM)txtHwnd);
        */

        //you can just ignore this, this is just for me to see whats inside wParam of the subclass
        case WM_LBUTTONDOWN: {
            wmId = LOWORD(wParam);
            wmEvent = HIWORD(wParam);

            int HI = swprintf_s(wParamHI, 1000, L"wParamHI: %d", wmEvent);
            MessageBox(nullptr, wParamHI, L":D", MB_OK | MB_ICONINFORMATION);

            int LO = swprintf_s(wParamLO, 1000, L"wParamLO: %d", wmId);
            MessageBox(nullptr, wParamLO, L":D", MB_OK | MB_ICONINFORMATION);
            break;
        }
    }
    return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}

//child window proc, which contains the static text control
LRESULT CALLBACK WndProcChild(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch (message) {
        //...some other codes...

        txtHwnd = CreateWindow(L"Static", L"Hello World!", WS_VISIBLE | WS_CHILD | SS_NOTIFY, 100, 100, 120, 15, hChild, (HMENU)testingTxtID, nullptr, nullptr);

        //control subclassing
        //a.k.a attaching subclass proc to the static text control
        SetWindowSubclass(txtHwnd, OwnerTxtProc, 0, 0);

        //...some other codes...

        default: {
           return DefWindowProc(hChild, message, wParam, lParam);
        }
    return 0;
}

請忽略我在里面WM_MOUSEHOVER和WM_CTLCOLORSTATIC里面注釋掉的代碼OwnerTxtProc(...)。它們只是我用來嘗試繪制文本控制元件的代碼，但不起作用。

更新：

感謝上帝，也非常感謝 Remy Lebeau，我設法解決了我在這件事上的問題。

//global variable(s)
COLORREF bkgndColor;
COLORREF txtColor;
HBRUSH hbrBkgnd = nullptr;
const UINT APP_CTLCOLORSTATIC = WM_APP   1;

//class for mouse event
class MouseTrackEvents
{
    bool m_bMouseTracking;

public:
    MouseTrackEvents() : m_bMouseTracking(false) {}

    void OnMouseMove(HWND hwnd)
    {
        if (!m_bMouseTracking)
        {
            // Enable mouse tracking.
            TRACKMOUSEEVENT tme;
            tme.cbSize = sizeof(tme);
            tme.hwndTrack = hwnd;
            tme.dwFlags = TME_HOVER | TME_LEAVE;
            tme.dwHoverTime = 10; //1ms
            TrackMouseEvent(&tme);
            m_bMouseTracking = true;
        }
    }
    void Reset(HWND hwnd)
    {
        m_bMouseTracking = false;
    }
};

//proc for static text contorl subclass
LRESULT CALLBACK OwnerTxtProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData) {
    //local mouse track variable
    MouseTrackEvents mouseTrack;

    RECT txtRt;
    GetWindowRect(hWnd, &txtRt);

    POINT txtPt;
    GetCursorPos(&txtPt);

    switch (uMsg) {
        
        //...some other codes...

        case WM_NCDESTROY: {
            RemoveWindowSubclass(hWnd, OwnerTxtProc, uIdSubclass);
            if (hbrBkgnd) {
                DeleteBrush(hbrBkgnd);
                hbrBkgnd = NULL;
            }

            mouseTrack.Reset(hWnd);
            break;
        }

        case WM_MOUSEMOVE: {
            mouseTrack.OnMouseMove(hWnd); //activate mouse tracking

            break;
        }

        case WM_MOUSEHOVER: {
            if (PtInRect(&txtRt, txtPt)) {
                OutputDebugString(L"--------------This text control is being hovered---------------\n");
                bkgndColor = RGB(0, 0, 200); // blue
                txtColor = RGB(200, 0, 0); // red
                InvalidateRect(hWnd, NULL, FALSE);
            }
            else {
                OutputDebugString(L"--------------This text control is being left---------------\n");
                bkgndColor = RGB(100, 0, 0); // red bg
                txtColor = RGB(0, 100, 0); // green txt
                InvalidateRect(hWnd, NULL, FALSE);
            }

            mouseTrack.Reset(hWnd);

            break;
        }

        case WM_MOUSELEAVE: {
            if (!(PtInRect(&txtRt, txtPt))) {
                OutputDebugString(L"--------------This text control is being hovered---------------\n");
                bkgndColor = RGB(100, 0, 0); // red bg
                txtColor = RGB(0, 100, 0); // green txt
                InvalidateRect(hWnd, NULL, FALSE);
            }

            mouseTrack.Reset(hWnd);

            break;
        }

        case APP_CTLCOLORSTATIC: {
            HDC hdc = reinterpret_cast<HDC>(wParam);

            SetTextColor(hdc, txtColor);
            SetBkColor(hdc, bkgndColor);

            if (hbrBkgnd) {
                DeleteBrush(hbrBkgnd);
            }
            hbrBkgnd = CreateSolidBrush(bkgndColor);

            //return reinterpret_cast<LRESULT&>(bkgndColor); //--> error --> so i added '&'
            return (LRESULT)hbrBkgnd;
        }

        //...some other codes...
    }
    return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}

//parent of static text control
LRESULT CALLBACK WndProcChild(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    //...some other codes...

    switch (message)
    {
    case WM_CTLCOLORSTATIC:
    {
        return SendMessage(reinterpret_cast<HWND>(lParam), APP_CTLCOLORSTATIC, wParam, 0);
    }

    case WM_CREATE: //put all sorts of stuff when the context menu is called
    {
        //font to be set to
        hFont = CreateFont(17, 0, 0, 0, FW_DONTCARE, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_TT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, TEXT("Segoe UI"));

        //set font of the textCtrl
        //doesnt work if handler target = hChild
        for (int i = 0; i < textCtrlSize; i  ) {
            SendMessage(textCtrl[i], WM_SETFONT, (WPARAM)hFont, TRUE);
        }

        bkgndColor = RGB(100, 0, 0); // red bg
        txtColor = RGB(0, 100, 0); // green txt

        txtHwnd = CreateWindow(L"Static", L"Hello World!", WS_VISIBLE | WS_CHILD | SS_NOTIFY, 100, 100, 120, 30, hChild, (HMENU)testingTxtID, nullptr, nullptr);
        SetWindowSubclass(txtHwnd, OwnerTxtProc, 0, 0);

        break;
    }

    //...some other codes...

    default:
        return DefWindowProc(hChild, message, wParam, lParam);
    }
    return 0;
}

uj5u.com熱心網友回復：

控制元件的所有繪制操作應該只在WM_CTLCOLORSTATIC處理程式內部，甚至是WM_PAINT處理程式內部。

要觸發控制元件的重繪，只需使用InvalidateRect().

如果要更改涂裝條件，請將相關資訊存盤在涂裝代碼使用的變數中，然后在使控制元件無效之前更新這些變數。

嘗試這樣的事情：

HWND txtHwnd;
bool bMouseTracking = false;
COLORREF bkgndColor = ...; // whatever you want...
COLORREF txtColor = ...; // whatever you want...
HBRUSH hbrBkgnd = nullptr;

const UINT APP_CTLCOLORSTATIC = WM_APP   1;

LRESULT CALLBACK StaticTxtProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData) {
    switch (uMsg) {
        case WM_NCDESTROY: {
            RemoveWindowSubclass(hWnd, StaticTxtProc, uIdSubclass);
            if (hbrBkgnd) {
                DeleteBrush(hbrBkgnd);
                hbrBkgnd = NULL;
            }
            bMouseTracking = false;
            break;
        }

        case WM_MOUSEMOVE: {
            if (!bMouseTracking) {
                TRACKMOUSEEVENT tme = {};
                tme.cbSize = sizeof(tme);
                tme.hwndTrack = hWnd;
                tme.dwFlags = TME_HOVER;
                tme.dwHoverTime = 100; //0.1s
                bMouseTracking = TrackMouseEvent(&tme);
            }

            RECT txtRt;
            GetWindowRect(hWnd, &txtRt);

            POINT txtPt;
            GetCursorPos(&txtPt);

            if (PtInRect(&txtRt, txtPt)) {
                bkgndColor = ...; // whatever you want...
                txtColor = ...; // whatever you want...
                InvalidateRect(hWnd, NULL, TRUE);
            }

            break;
        }

        case WM_MOUSEHOVER: {
            mMouseTracking = false;
            bkgndColor = ...; // whatever you want...
            txtColor = ...; // whatever you want...
            InvalidateRect(hWnd, NULL, TRUE);
            break;
        }

        case APP_CTLCOLORSTATIC: {
            HDC hdc = reinterpret_cast<HDC>(wParam);

            SetTextColor(hdc, txtColor);
            SetBkColor(hdc, bkgndColor);

            if (hbrBkgnd)
                DeleteBrush(hbrBkgnd);
            hbrBkgnd = CreateSolidBrush(bkgndColor);

            return reinterpret_cast<LRESULT>(bkgndColor);
        }

        case WM_LBUTTONDOWN: {
            // ...
            break;
        }
    }

    return DefSubclassProc(hWnd, uMsg, wParam, lParam);
}

LRESULT CALLBACK WndProcChild(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch (message) {
        case WM_CREATE: {
            bkgndColor = ...; // whatever you want...
            txtColor = ...; // whatever you want...

            txtHwnd = CreateWindow(L"Static", L"Hello World!", WS_VISIBLE | WS_CHILD | SS_NOTIFY, 100, 100, 120, 15, hChild, (HMENU)testingTxtID, nullptr, nullptr);
            SetWindowSubclass(txtHwnd, StaticTxtProc, 0, 0);

            break;
        }

        case WM_CTLCOLORSTATIC: {
            return SendMessage(reinterpret_cast<HWND>(lParam), APP_CTLCOLORSTATIC, wParam, 0);
        }

        //...some other codes...

        default: {
            return DefWindowProc(hChild, message, wParam, lParam);
        }
    }

    return 0;
}

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