Method updateGridCursor

switch/source/MainScreen.cpp:266–319

}

void MainScreen::updateGridCursor(const InputState& input, size_t count)
{
    if (count == 0) {
        mCursor    = 0;
        mScrollRow = 0;
        return;
    }
    if (mCursor >= count) {
        mCursor = count - 1;
    }

    const u64 now = armGetSystemTick();
    // A fresh press moves immediately; a held direction repeats every
    // GRID_REPEAT_TICKS (which also serves as the initial delay).
    auto pressed = [&](u64 mask) { return (input.kDown & mask) || ((input.kHeld & mask) && now > mLastMoveTick + GRID_REPEAT_TICKS); };

    const size_t lastRow = (count - 1) / GRID_COLS;
    const size_t row     = mCursor / GRID_COLS;
    bool moved           = false;

    if (pressed(HidNpadButton_AnyUp)) {
        if (row > 0) {
            mCursor -= GRID_COLS;
            moved = true;
        }
    }
    else if (pressed(HidNpadButton_AnyDown)) {
        if (row < lastRow) {
            mCursor = std::min(mCursor + GRID_COLS, count - 1);
            moved   = true;
        }
    }
    else if (pressed(HidNpadButton_AnyLeft)) {
        // Left at column 0 is the sidebar-entry gesture, handled by the
        // caller before this runs.
        if (mCursor % GRID_COLS != 0) {
            mCursor--;
            moved = true;
        }
    }
    else if (pressed(HidNpadButton_AnyRight)) {
        // Row-major continuation: right on the last column flows to the next
        // row's first tile.
        if (mCursor + 1 < count) {
            mCursor++;
            moved = true;
        }
    }

    if (moved) {
        mLastMoveTick = now;
    }
    scrollToCursor(count);
}

void MainScreen::setSaveTypeFilter(saveTypeFilter_t filter)
{