Function MessageDialogFunc

echo.c:527–636

A modeless message box. * Use AddMessageBoxText to add content and display * the window. On WM_CLOSE the window is hidden, not destroyed. */

 * the window. On WM_CLOSE the window is hidden, not destroyed.
 */
static INT_PTR CALLBACK
MessageDialogFunc(HWND hwnd, UINT msg, UNUSED WPARAM wParam, LPARAM lParam)
{
    HICON hIcon;
    HWND hmsg;
    const UINT top_margin = DPI_SCALE(16);
    const UINT side_margin = DPI_SCALE(20);
    NMHDR *nmh;

    switch (msg)
    {
        case WM_INITDIALOG:
            hIcon = LoadLocalizedIcon(ID_ICO_APP);
            if (hIcon)
            {
                SendMessage(hwnd, WM_SETICON, (WPARAM)(ICON_SMALL), (LPARAM)(hIcon));
                SendMessage(hwnd, WM_SETICON, (WPARAM)(ICON_BIG), (LPARAM)(hIcon));
            }
            hmsg = GetDlgItem(hwnd, ID_TXT_MESSAGE);
            SetWindowText(hwnd, L"OpenVPN Messages");
            SendMessage(hmsg,
                        EM_SETMARGINS,
                        EC_LEFTMARGIN | EC_RIGHTMARGIN,
                        MAKELPARAM(side_margin, side_margin));
            if (LangFlowDirection() == 1)
            {
                LONG exstyle = GetWindowLong(hwnd, GWL_EXSTYLE);
                SetWindowLong(hwnd, GWL_EXSTYLE, exstyle | WS_EX_RTLREADING | WS_EX_LAYOUTRTL);
                exstyle = GetWindowLong(hmsg, GWL_EXSTYLE);
                SetWindowLong(hmsg, GWL_EXSTYLE, exstyle | WS_EX_LEFTSCROLLBAR);
            }

            enable_url_detection(hmsg);

            /* Position the window close to top right corner of the screen */
            RECT rc;
            GetWindowRect(hwnd, &rc);
            OffsetRect(&rc, -rc.left, -rc.top);
            int ox = GetSystemMetrics(SM_CXSCREEN); /* screen size along x */
            ox -= rc.right + DPI_SCALE(rand() % 50 + 25);
            int oy = DPI_SCALE(rand() % 50 + 25);
            SetWindowPos(hwnd, HWND_TOP, ox > 0 ? ox : 0, oy, 0, 0, SWP_NOSIZE);

            return TRUE;

        case WM_SIZE:
            hmsg = GetDlgItem(hwnd, ID_TXT_MESSAGE);
            /* leave some space as top margin */
            SetWindowPos(hmsg, NULL, 0, top_margin, LOWORD(lParam), HIWORD(lParam) - top_margin, 0);
            InvalidateRect(hwnd, NULL, TRUE);
            break;

        /* set the whole client area background to white */
        case WM_CTLCOLORDLG:
        case WM_CTLCOLORSTATIC:
            return (INT_PTR)GetStockObject(WHITE_BRUSH);
            break;