Method window

common/script/scriptlogview.cpp:64–100

}

ScriptLogView::Window ScriptLogView::window(void)
{
    ScriptConsole& console = ScriptConsole::get();

    Window w;
    w.total = console.lineCount();
    if (w.total == 0) {
        mRows.clear();
        return w;
    }

    // Pinned to the tail unless the user scrolled back, so a talking script
    // pushes the view along instead of scrolling out from under them. The
    // scrollback is clamped again here rather than trusted: the console drops
    // its oldest lines as it grows, which can move the tail under a scrollback
    // that was in range when it was set.
    const size_t maxFirst = w.total > (size_t)mViewport ? w.total - (size_t)mViewport : 0;
    const size_t back     = std::min((size_t)mScrollBack, maxFirst);
    w.first               = maxFirst - back;

    // Re-copy only when the content or the window actually moved.
    const unsigned gen = console.generation();
    if (gen != mSeenGeneration || w.first != mSeenFirst || mRows.size() != (size_t)mViewport) {
        console.copyWindow(w.first, (size_t)mViewport, mRows);
        mSeenGeneration = gen;
        mSeenFirst      = w.first;
    }

    // Scrollbar only once there is more than one screenful. maxFirst is then
    // non-zero, so the travel fraction is safe to divide.
    w.scrollbar = w.total > (size_t)mViewport;
    if (w.scrollbar) {
        w.thumbSpan   = (float)mViewport / (float)w.total;
        w.thumbTravel = (float)w.first / (float)maxFirst;
    }
    return w;
}