reactos/base/applications/rapps/include/crichedit.h

#pragma once
#include <ui/rosctrls.h>

class CRichEdit : public CWindow
{
    HMODULE m_LoadedLibrary;

    VOID
    GenericInsertText(LPCWSTR lpszText, SIZE_T InsertedTextLen, DWORD dwEffects)
    {
        SETTEXTEX SetText;
        SIZE_T Len = GetTextLen();

        if (InsertedTextLen)
        {
            /* Insert new text */
            SetText.flags = ST_SELECTION;
            SetText.codepage = 1200;

            SendMessageW(EM_SETTEXTEX, (WPARAM)&SetText, (LPARAM)lpszText);

            if ((dwEffects == CFM_LINK) && !PathIsURLW(lpszText))
            {
                // if text is not an URL, no styling is used
                SetRangeFormatting(Len, Len + InsertedTextLen, 0);
            }
            else
            {
                SetRangeFormatting(Len, Len + InsertedTextLen, dwEffects);
            }
        }
    }

  public:
    CRichEdit() : CWindow(), m_LoadedLibrary(NULL)
    {
    }

    VOID
    SetRangeFormatting(SIZE_T Start, SIZE_T End, DWORD dwEffects)
    {
        CHARFORMAT2W CharFormat;

        SendMessageW(EM_SETSEL, Start, End);

        ZeroMemory(&CharFormat, sizeof(CharFormat));

        CharFormat.cbSize = sizeof(CharFormat);
        CharFormat.dwMask = dwEffects;
        CharFormat.dwEffects = dwEffects;

        SendMessageW(EM_SETCHARFORMAT, SCF_WORD | SCF_SELECTION, (LPARAM)&CharFormat);

        SendMessageW(EM_SETSEL, End, End + 1);
    }

    LONG
    GetTextLen()
    {
        GETTEXTLENGTHEX TxtLenStruct;

        TxtLenStruct.flags = GTL_NUMCHARS;
        TxtLenStruct.codepage = 1200;

        return (LONG)SendMessageW(EM_GETTEXTLENGTHEX, (WPARAM)&TxtLenStruct, 0);
    }

    /*
     * Insert text (without cleaning old text)
     * Supported effects:
     *   - CFM_BOLD
     *   - CFM_ITALIC
     *   - CFM_UNDERLINE
     *   - CFM_LINK
     */
    VOID
    InsertText(LPCWSTR lpszText, DWORD dwEffects)
    {
        GenericInsertText(lpszText, wcslen(lpszText), dwEffects);
    }

    VOID
    InsertText(const CStringW &szText, DWORD dwEffects)
    {
        GenericInsertText(szText.GetString(), szText.GetLength(), dwEffects);
    }
    /*
     * Clear old text and add new
     */
    VOID
    SetText(LPCWSTR lpszText, DWORD dwEffects)
    {
        SetWindowTextW(L"");
        InsertText(lpszText, dwEffects);
    }

    VOID
    SetText(const CStringW &szText, DWORD dwEffects)
    {
        SetText(szText.GetString(), dwEffects);
    }

    HWND
    Create(HWND hwndParent)
    {
        m_LoadedLibrary = LoadLibraryW(L"riched20.dll");

        m_hWnd = CreateWindowExW(
            0, L"RichEdit20W", NULL, WS_CHILD | WS_VISIBLE | ES_MULTILINE | ES_LEFT | ES_READONLY, 205, 28, 465, 100,
            hwndParent, NULL, _AtlBaseModule.GetModuleInstance(), NULL);

        if (m_hWnd)
        {
            SendMessageW(EM_SETBKGNDCOLOR, 0, GetSysColor(COLOR_BTNFACE));
            SendMessageW(WM_SETFONT, (WPARAM)GetStockObject(DEFAULT_GUI_FONT), 0);
            SendMessageW(EM_SETEVENTMASK, 0, ENM_LINK | ENM_MOUSEEVENTS);
            SendMessageW(EM_SHOWSCROLLBAR, SB_VERT, TRUE);
        }

        return m_hWnd;
    }

    virtual VOID
    OnLink(ENLINK *Link)
    {
    }

    ~CRichEdit()
    {
        if (m_LoadedLibrary)
        {
            FreeLibrary(m_LoadedLibrary);
        }
    }
};