Method AnimateTextBlock

Apps/05-Typography/TypographyApp.cpp:344–391

}

void TypographyApp::AnimateTextBlock(size_t block_index, int32_t& vertical_text_pos_in_dots)
{
    const gui::TextItem& text       = *m_texts[block_index];
    const std::u32string& full_text = g_text_blocks[block_index];
    const size_t text_block_length  = full_text.length();
    size_t& displayed_text_length   = m_displayed_text_lengths[block_index];

    if (displayed_text_length == (m_settings.is_forward_typing_direction ? 0 : text_block_length))
    {
        text.SetText(m_settings.is_forward_typing_direction ? std::u32string() : full_text);
        if (!m_settings.is_forward_typing_direction)
            vertical_text_pos_in_dots = text.GetRectInDots().GetBottom() + g_margin_size_in_dots;
        return;
    }

    if (displayed_text_length == (m_settings.is_forward_typing_direction ? text_block_length : 0))
    {
        if (block_index == (m_settings.is_forward_typing_direction ? g_text_blocks_count - 1 : 0))
        {
            ResetAnimation();
            return;
        }

        vertical_text_pos_in_dots = text.GetRectInDots().GetBottom() + g_margin_size_in_dots;
        size_t next_block_index = block_index + (m_settings.is_forward_typing_direction ? 1 : -1);
        size_t& next_displayed_text_length = m_displayed_text_lengths[next_block_index];

        if (m_settings.is_forward_typing_direction && next_displayed_text_length == 0)
            next_displayed_text_length = 1;

        if (!m_settings.is_forward_typing_direction && next_displayed_text_length == g_text_blocks[next_block_index].length())
            next_displayed_text_length = g_text_blocks[next_block_index].length() - 1;

        return;
    }

    if (m_settings.is_forward_typing_direction)
        displayed_text_length++;
    else
        displayed_text_length--;

    const std::u32string displayed_text = full_text.substr(0, displayed_text_length);
    const gui::UnitRect  text_block_rect = GetTextBlockRectInDots(block_index, vertical_text_pos_in_dots, GetFrameSizeInDots());

    m_text_update_duration = UpdateText(text, displayed_text, text_block_rect);

    vertical_text_pos_in_dots = text.GetRectInDots().GetBottom() + g_margin_size_in_dots;
}

void TypographyApp::ResetAnimation()
{