C++ (Cpp) DrawingContext::Pop示例

void HorizontalLayout::Draw(DrawingContext & drawingContext)
{
    UpdateLayout();
    POMDOG_ASSERT(!needToUpdateLayout);

    auto transform = GetTransform() * drawingContext.Top();

#if 0
    renderCommand.SetInvoker([transform, this](PrimitiveBatch& primitiveBatch) {
        const Color backgroundColor = {45, 45, 48, 225};
        const Color borderColor = {40, 40, 40, 255};
        const Color highlightColor = {106, 106, 106, 255};

        const auto width = static_cast<float>(GetWidth());
        const auto height = static_cast<float>(GetHeight());

        primitiveBatch.DrawRectangle(transform, Vector2::Zero, width, height, backgroundColor);

        primitiveBatch.DrawLine(transform, Vector2{0.0f, 0.0f}, Vector2{width, 0.0f}, borderColor, 1.0f);
        primitiveBatch.DrawLine(transform, Vector2{0.0f, 0.0f}, Vector2{0.0f, height}, borderColor, 1.0f);
        primitiveBatch.DrawLine(transform, Vector2{0.0f, height}, Vector2{width, height}, borderColor, 1.0f);
        primitiveBatch.DrawLine(transform, Vector2{width, 0.0f}, Vector2{width, height}, borderColor, 1.0f);
    });
    drawingContext.PushCommand(renderCommand);
#endif

    drawingContext.Push(transform);

    for (auto & child : children) {
        POMDOG_ASSERT(child);
        child->Draw(drawingContext);
    }

    drawingContext.Pop();
}