- (BOOL)fullRefreshRequared
{
    // èÓÎÌÓ ӷÌÓ‚ÎÂÌË ÌÂÓ·ıÓ‰ËÏÓ, ÂÒÎË:

    // äÓÌÚÂÌÚ ·‡Ú‡ ¢fi ÌË ‡ÁÛ Ì ‡Ò˜ËÚ‡Ì
    if (!isRendered)
        return YES;

    // ëÏÂÌfiÌ ÂÊËÏ ÓÚÓ·‡ÊÂÌËfl Ú‡·‡
    if (viewParams.viewMode != renderViewParams.viewMode)
        return YES;

    // Ç ÂÊËÏ ·ÂÁ ÔÂÂÌÓÒ‡ ·ÎÓÍÓ‚ ËÁÏÂÌÂÌ˚ Á̇˜ÂÌËfl
    if ((viewParams.viewMode == _prefix_ModePlain) &&
        ((viewParams.fontSize != renderViewParams.fontSize) ||                      // ÁÛχ
         (viewParams.transpose != renderViewParams.transpose) ||                      // Ú‡ÌÒÔÓÁ‡
         (![(viewParams.fontName) isEqualToString:(renderViewParams.fontName)])       // ¯ËÙÚ‡
         ))
        return YES;

    // Ç Ó‰ÌÓÒÚ‡Ì˘ÌÓÏ ÂÊËÏ ËÁÏÂÌÂÌ˚ Á̇˜ÂÌËfl
    if ((viewParams.viewMode == _prefix_ModeOnePage) &&
        ((viewParams.viewportSize.width != renderViewParams.viewportSize.width) ||    // ¯ËËÌ˚ ӷ·ÒÚË ÔÓÒÏÓÚ‡
         (viewParams.fontSize != renderViewParams.fontSize) ||                      // ÁÛχ
         (viewParams.transpose != renderViewParams.transpose) ||                      // Ú‡ÌÒÔÓÁ‡
         (![(viewParams.fontName) isEqualToString:(renderViewParams.fontName)])       // ¯ËÙÚ‡
         ))
        return YES;

    // Ç ÏÌÓ„ÓÒÚ‡Ì˘ÌÓÏ ÂÊËÏ ËÁÏÂÌÂÌ˚ Á̇˜ÂÌËfl
    if ((viewParams.viewMode == _prefix_ModePaged) &&
        ((viewParams.viewportSize.width != renderViewParams.viewportSize.width) ||    // ¯ËËÌ˚ ӷ·ÒÚË ÔÓÒÏÓÚ‡
         (viewParams.viewportSize.height != renderViewParams.viewportSize.height) ||  // ‚˚ÒÓÚ˚ ӷ·ÒÚË ÔÓÒÏÓÚ‡
         (viewParams.fontSize != renderViewParams.fontSize) ||                      // ÁÛχ
         (viewParams.transpose != renderViewParams.transpose) ||                      // Ú‡ÌÒÔÓÁ‡
         (![(viewParams.fontName) isEqualToString:(renderViewParams.fontName)])       // ¯ËÙÚ‡
         ))
        return YES;

    return NO;
}