Method drawTransform_

source/MRViewer/ImGuiMenu.cpp:2744–2925

}

float ImGuiMenu::drawTransform_()
{
    // Use topmost-selected objects so that when a parent and its child are both selected,
    // only the parent is edited — otherwise applying the same xf to both would move the
    // child twice (once through its own xf, once through the parent's cascade).
    const auto& selected = SceneCache::getAllTopmostObjects<Object, ObjectSelectivityType::Selected>();

    // Hide the panel if nothing is selected or any selected object is locked —
    // a generalisation of the original single-object `!selected[0]->isLocked()` gate.
    const bool canShow = !selected.empty()
        && std::none_of( selected.begin(), selected.end(),
            []( const auto& o ){ return o->isLocked(); } );
    if ( !canShow )
    {
        transformBlockShown_ = false;
        return 0.f;
    }

    auto& style = ImGui::GetStyle();

    // Fix up the scene-list scroll on the frame the transform block first appears, so the
    // selected row stays in view as the properties panel grows by the block's height.
    if ( !transformBlockShown_ )
    {
        transformBlockShown_ = true;
        sceneObjectsList_->setNextFrameFixScroll();
    }

    // When transforms differ across the selection, we display "—" in the fields, do not
    // enter the editing path, and do not open the context menu — its Copy/Paste/Reset
    // operations assume a single shared xf to read from and write back to.
    const AffineXf3f& xf0 = selected.front()->xf();
    const bool allSame = std::all_of( selected.begin() + 1, selected.end(),
        [&]( const auto& o ){ return o->xf() == xf0; } );

    float resultHeight_ = ImGui::GetTextLineHeight() + style.FramePadding.y * 2 + style.ItemSpacing.y;
    bool openedContext = false;
    if ( drawCollapsingHeaderTransform_() )
    {
        openedContext = drawTransformContextMenu_( selected );
        const float transformHeight = ( ImGui::GetTextLineHeight() + style.FramePadding.y * 2 ) * 3 + style.ItemSpacing.y * 2;
        resultHeight_ += transformHeight + style.ItemSpacing.y;
        ImGui::BeginChild( "SceneTransform", ImVec2( 0, transformHeight ) );

        auto xf = xf0;
        Matrix3f q, r;
        Vector3f euler;
        Vector3f scale;
        if ( allSame )
        {
            decomposeMatrix3( xf.A, q, r );
            euler = ( 180 / PI_F ) * q.toEulerAngles();
            scale = Vector3f{ r.x.x, r.y.y, r.z.z };
        }

        bool inputDeactivated = false;
        bool inputChanged = false;