C ++ WinAPI [GDI]。自定义gui正确重绘

Question

我正在使用WinAPI和GDI创建自定义gui。我有一些问题，重新绘制它。如果我将拖动窗口，它重绘很好，但如果我拖动窗口超出屏幕它不重绘。看下面的截图：

Normal window moving

Move window beyond the screen

Move back

ToxicInjector.cpp：

#include "ToxicInjector.h"

...

// Method register native window object
bool ToxicInject::Application::RegisterNativeWindow()
{
    WNDCLASSEX wc{ sizeof(WNDCLASSEX) };
    ...
    wc.style = CS_VREDRAW | CS_HREDRAW;

    ...
}

// Window message procedure
LRESULT ToxicInject::Application::WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        // Executes when window creates
        case WM_CREATE:
        {
            this->CreateNativeControls();
            ...
        }
        break;

        ...

        // Need for draw custom controls
        case WM_DRAWITEM:
        {
            static LPDRAWITEMSTRUCT pdis = reinterpret_cast<LPDRAWITEMSTRUCT>(lParam);
            switch (pdis->CtlID)
            {
                case UPDATE_BUTTON:
                {
                    if (pdis->itemState & ODS_SELECTED)
                        this->isMouseOnUpdateBtn = true;
                    else
                        this->isMouseOnUpdateBtn = false;

                    this->DrawUpdateButton(pdis->hDC);
                }
                break;

                case INJECT_BUTTON:
                {
                    if (pdis->itemState & ODS_SELECTED)
                        this->isMouseOnInjectBtn = true;
                    else
                        this->isMouseOnInjectBtn = false;
                    this->DrawInjectButton(pdis->hDC);
                }
                break;

                case BROWSE_BUTTON:
                {
                    if (pdis->itemState & ODS_SELECTED)
                        this->isMouseOnBrowseBtn = true;
                    else
                        this->isMouseOnBrowseBtn = false;

                    this->DrawBrowseButton(pdis->hDC);
                }
                break;
            }
        }
        break;

        ...

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

...

// Method creates all native-window controls
void ToxicInject::Application::CreateNativeControls()
{
    ...

    this->hUpdate_Button = CreateWindow(L"BUTTON", L"", WS_VISIBLE| WS_CHILD | BS_OWNERDRAW, 224, 50, 212, 26, this->hwnd, reinterpret_cast<HMENU>(this->UPDATE_BUTTON), 0, 0);
    this->hInject_Button = CreateWindow(L"BUTTON", L"", WS_VISIBLE| WS_CHILD | BS_OWNERDRAW, 224, 76 + 15, 212, 26, this->hwnd, reinterpret_cast<HMENU>(this->INJECT_BUTTON), 0, 0);
    this->hBrowse_Button = CreateWindow(L"BUTTON", L"", WS_VISIBLE| WS_CHILD | BS_OWNERDRAW, 224, 91 + 26 + 15, 212, 26, this->hwnd, reinterpret_cast<HMENU>(this->BROWSE_BUTTON), 0, 0);
}

...

// Method draw update button
void ToxicInject::Application::DrawUpdateButton(HDC hDC)
{
    ...

    if (this->isMouseOnUpdateBtn)
    {
        bg = CreateSolidBrush(RGB(44, 97, 46));

        /*DRAW BACKGROUND*/
        FillRect(hDC, &rc, bg);

        /*DRAW BOTTOM LINE*/
        SelectObject(hDC, hPen);
        MoveToEx(hDC, 0, 26, 0);
        LineTo(hDC, 212, 26);

        /*DRAW TEXT*/
        SetBkColor(hDC, RGB(44, 97, 46));
        SetTextColor(hDC, RGB(255, 255, 255));
        SelectObject(hDC, hTahoma_Regular);

        TextOut(hDC, 83, 3, L"Update", 7);

        /*FREE GDI MEMORY*/
        DeleteObject(bg);
        DeleteObject(hTahoma_Regular);
        DeleteObject(hPen);
    }
    else
    {
        bg = CreateSolidBrush(RGB(67, 156, 70));

        /*DRAW BACKGROUND*/
        FillRect(hDC, &rc, bg);

        /*DRAW BOTTOM LINE*/
        SelectObject(hDC, hPen);
        MoveToEx(hDC, 0, 26, 0);
        LineTo(hDC, 212, 26);

        /*DRAW TEXT*/
        SetBkColor(hDC, RGB(67, 156, 70));
        SetTextColor(hDC, RGB(255, 255, 255));
        SelectObject(hDC, hTahoma_Regular);

        TextOut(hDC, 83, 2, L"Update", 7);

        /*FREE GDI MEMORY*/
        DeleteObject(bg);
        DeleteObject(hTahoma_Regular);
        DeleteObject(hPen);
    }
}

...

抱歉我的英文=）。如何解决这个问题？

Answer 1

所以我修好了！

        case WM_DRAWITEM:
        {
            LPDRAWITEMSTRUCT pdis = reinterpret_cast<LPDRAWITEMSTRUCT>(lParam);
            switch (pdis->CtlID)
            ...
        }

指向DRAWITEMSTRUCT的指针应该是非静态的！这是逻辑错误，我的错误。完美的工作=）。

Answer 2

您可以强制重绘以回答WM_MOVE

case WM_MOVE:
    this->OnWindow_Paint();
    break;