StackedWidget.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "visualization/gui/StackedWidget.h"
 
#include <algorithm>  // for std::max, std::min
 
namespace cloudViewer {
namespace visualization {
namespace gui {
 
struct StackedWidget::Impl {
    int selected_index_ = 0;
};
 
StackedWidget::StackedWidget() : impl_(new StackedWidget::Impl()) {}
 
StackedWidget::~StackedWidget() {}
 
void StackedWidget::SetSelectedIndex(int index) {
    impl_->selected_index_ = index;
}
 
int StackedWidget::GetSelectedIndex() const { return impl_->selected_index_; }
 
Size StackedWidget::CalcPreferredSize(const LayoutContext& context,
                                      const Constraints& constraints) const {
    Size size(0, 0);
    for (auto child : GetChildren()) {
        auto sz = child->CalcPreferredSize(context, constraints);
        size.width = std::max(size.width, sz.width);
        size.height = std::max(size.height, sz.height);
    }
    return size;
}
 
void StackedWidget::Layout(const LayoutContext& context) {
    auto& frame = GetFrame();
    for (auto child : GetChildren()) {
        child->SetFrame(frame);
    }
 
    Super::Layout(context);
}
 
Widget::DrawResult StackedWidget::Draw(const DrawContext& context) {
    // Don't Super, because Widget::Draw will draw all the children,
    // and we only want to draw the selected child.
    if (impl_->selected_index_ >= 0 &&
        impl_->selected_index_ < int(GetChildren().size())) {
        return GetChildren()[impl_->selected_index_]->Draw(context);
    }
    return DrawResult::NONE;
}
 
}  // namespace gui
}  // namespace visualization
}  // namespace cloudViewer