自定义编辑控件win32

Posted 2021-03-30

我终于设法使用richedit和iczelion的教程完成了语法高亮。现在我发现它，它肯定不够快。我想提前一步：自定义编辑控件。但我不知道如何去做。你能告诉我怎么去吗？给我一些信息开始？也许甚至一些教程或建议一些书？

现在我不是要求你们为我拼出来，只是要开始。我将使用C ++ / ASM / Win32 API。我相信你们中的许多人之前已经制作了自定义编辑控件，所以你甚至可以分享你的经验。

谢谢，

Devjeet

答案

您将要查看所有者绘制的控件。 MSDN有一个example of doing this with a list box。您可以将其调整为Edit控件。

另一答案

我花了一天时间编写我自己的自定义编辑控件 - 它运行良好，所以我想在这里分享我的经验，也许对于这个代码可能有帮助的人...因为自定义绘制一个共同的编辑控件是不可能的（see here），你必须编写自己的编辑控件。一般步骤是：

// global vars
int select; // current selection position
int cursor; // current cursor position
HWND parent; // parent window
wchar_t buf[MAXINPUTBUF]; // edit buffer
WNDPROC oldproc; // old window procedure

// create custom control window
hWnd = CreateWindowW(L"static", NULL, WS_CHILD | WS_TABSTOP | SS_LEFT | SS_NOTIFY, 0, 0, 0, 0, parent, NULL, (HINSTANCE)GetWindowLongPtr(parent, GWL_HINSTANCE), NULL);

// todo: use SetProp() to store all global vars
oldproc = (WNDPROC)SetWindowLongPtrW(hWnd, GWL_WNDPROC, (LONG_PTR)InputWndProc);

SetWindowPos(hWnd, HWND_TOP, x, y, cx, cy, 0);

如何显示键盘输入描述here。我的窗口过程如下所示

LRESULT CALLBACK InputWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{

    switch (msg)
    {
    case WM_LBUTTONDOWN:
        //SetFocus(hWnd);
        PostMessageW(GetParent(hWnd), WM_NEXTDLGCTL, (WPARAM)hWnd, TRUE);
        break;

    case WM_KILLFOCUS: 
        HideCaret(hWnd);
        DestroyCaret();
        break; 

    case WM_SETFOCUS:
        {
            RECT r;
            GetClientRect(hWnd, &r);
            // Create a solid black caret. 
            CreateCaret(hWnd, (HBITMAP) NULL, 2, r.bottom-r.top);

            ShowCaret(hWnd);
            InputWndRedraw(hWnd);

        }

        return FALSE;

    case WM_GETDLGCODE:
        return DLGC_WANTALLKEYS | DLGC_WANTARROWS;

    case WM_KEYDOWN:
    {
        switch (wParam)
        {
        case 'V':
            if (0x8000 & GetKeyState(VK_CONTROL))
            {
                HANDLE h;
                wchar_t *cb;
                int len,slen;

                InputWndDelete(hWnd);

                OpenClipboard(NULL);
                h = GetClipboardData(CF_UNICODETEXT);

                cb = (wchar_t*)GlobalLock(h);

                if (cb)
                {
                    memcpy(buf+(cursor+len)*sizeof(wchar_t), buf+cursor*sizeof(wchar_t), (slen-cursor)*sizeof(wchar_t));
                    memcpy(buf+cursor*sizeof(wchar_t), cb, len*sizeof(wchar_t));
                }

                GlobalUnlock(h);
                CloseClipboard();
                InputWndRedraw(hWnd);
            }
            break;

        case VK_RIGHT:

                if (cursor-1 >= MAXINPUTBUF || cursor >= (int)wcslen(buf))
                    break;

                cursor++;

                if (!(GetKeyState(VK_SHIFT) & 0x8000))
                    select = cursor;

                InputWndRedraw(hWnd);
                break;

            case VK_TAB:
                PostMessageW(GetParent(hWnd), WM_NEXTDLGCTL, GetKeyState(VK_SHIFT) & 0x8000, FALSE);
                break;

            case VK_LEFT:
                if (cursor <= 0)
                    break;

                cursor--;

                if (!(GetKeyState(VK_SHIFT) & 0x8000))
                    select = cursor;

                InputWndRedraw(hWnd);
                break;

            case VK_HOME:
                cursor = 0;

                if (!(GetKeyState(VK_SHIFT) & 0x8000))
                    select = cursor;

                InputWndRedraw(hWnd);
                break;

            case VK_END:
                cursor = wcslen(buf);

                if (!(GetKeyState(VK_SHIFT) & 0x8000))
                    select = cursor;

                InputWndRedraw(hWnd);
                break;

            case VK_DELETE:
                if (cursor >= (int)wcslen(buf))
                {
                    InputWndDelete(hWnd);
                    InputWndRedraw(hWnd);
                    break;
                }

                if (select == cursor)
                    select ++;

                InputWndDelete(hWnd);
                InputWndRedraw(hWnd);
            break;

            case VK_BACK:

                if (cursor <= 0)
                {
                    InputWndDelete(hWnd);
                    InputWndRedraw(hWnd);
                    break;
                }


                if (select == cursor)
                    cursor --;


                InputWndDelete(hWnd);
                InputWndRedraw(hWnd);
            }

        }
        break;

    case WM_CHAR: 
        if (wParam < VK_SPACE)
        break;


        InputWndDelete(hWnd);

        if (wcslen(buf)+1 < MAXINPUTBUF)
        {
            wmemmove(buf+(cursor+1)*sizeof(wchar_t), buf+cursor*sizeof(wchar_t), wcslen(s->buf)-cursor);
            buf[cursor] = wParam;
            cursor++;
            select = cursor;
        }

        InputWndRedraw(hWnd);

        break;

    case WM_ERASEBKGND:
        // no flickering
        return TRUE;

    case WM_PAINT:
        {
            HDC dc;
            PAINTSTRUCT paint;

            dc = BeginPaint(hWnd, &paint);
            InputWndDraw(hWnd, dc);
            EndPaint(hWnd, &paint);

        }
        return TRUE;

    }

    return CallWindowProcW(oldproc, hWnd, msg, wParam, lParam);
}

删除当前选定的文本（从选择到光标）。

void InputWndDelete(HWND hWnd)
{
    int len;

    len = wcslen(buf);

    if (select > cursor)
    {
        memcpy(buf+cursor*sizeof(wchar_t), buf+select*sizeof(wchar_t), (len - select)*sizeof(wchar_t));
        ZeroMemory(buf+(len-select+cursor)*sizeof(wchar_t), (MAXINPUTBUF-len+select-cursor)*sizeof(wchar_t));
        select = cursor;
    }
    else if (select < cursor)
    {
        memcpy(buf+select*sizeof(wchar_t), buf+cursor*sizeof(wchar_t), (len - cursor)*sizeof(wchar_t));
        ZeroMemory(buf+(len-cursor+select)*sizeof(wchar_t), (MAXINPUTBUF-len+cursor-select)*sizeof(wchar_t));
        cursor = select;
    }
    else
    {
        select = cursor;
    }
}

在窗口DC上绘制窗口

void InputWndRedraw(HWND hWnd)
{
    HDC hdc;

    HideCaret(hWnd); 

    hdc = GetDC(hWnd); 
    InputWndDraw(hWnd, hdc);
    ReleaseDC(hWnd, hdc); 

    ShowCaret(hWnd); 

}

在设备上下文中绘制输入缓冲区（buf *）。语法高亮和其他格式化功能在这里...

void InputWndDraw(HWND hWnd, HDC hdc)
{
    RECT r,cr;

    GetClientRect(hWnd, &cr);

    // draw selected rectangle FillRect()...

    CopyRect(&r,&cr);
    DrawTextW(hdc, buf, -1, &r, DT_LEFT | DT_TOP);


    if (cursor)
        DrawTextW(hdc, buf, cursor, &r, DT_LEFT | DT_TOP | DT_CALCRECT);
    else
        r.right = cr.left;

    if (GetFocus() == hWnd)
    {
        if (r.right > cr.right)
            SetCaretPos(cr.right, cr.top); 
        else
            SetCaretPos(r.right, cr.top); 
    }
}