WidgetStack.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "cloudViewer/visualization/gui/WidgetStack.h"
 
#include <stack>
 
namespace cloudViewer {
namespace visualization {
namespace gui {
struct WidgetStack::Impl {
    std::stack<std::shared_ptr<Widget>> widgets_;
    std::function<void(std::shared_ptr<Widget>)> on_top_callback_;
};
 
WidgetStack::WidgetStack() : impl_(new WidgetStack::Impl()) {}
WidgetStack::~WidgetStack() = default;
 
void WidgetStack::PushWidget(std::shared_ptr<Widget> widget) {
    impl_->widgets_.push(widget);
    SetWidget(widget);
}
 
std::shared_ptr<Widget> WidgetStack::PopWidget() {
    std::shared_ptr<Widget> ret;
    if (!impl_->widgets_.empty()) {
        ret = impl_->widgets_.top();
        impl_->widgets_.pop();
        if (!impl_->widgets_.empty()) {
            SetWidget(impl_->widgets_.top());
            if (impl_->on_top_callback_) {
                impl_->on_top_callback_(impl_->widgets_.top());
            }
        } else {
            SetWidget(nullptr);
        }
    }
    return ret;
}
void WidgetStack::SetOnTop(
        std::function<void(std::shared_ptr<Widget>)> onTopCallback) {
    impl_->on_top_callback_ = onTopCallback;
}
 
}  // namespace gui
}  // namespace visualization
}  // namespace cloudViewer