CanvasUpdateRequester.cxx

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#include "CanvasUpdateRequester.hxx"
#include <vcl/svapp.hxx>
#include <com/sun/star/lang/XComponent.hpp>
#include <com/sun/star/rendering/XSpriteCanvas.hpp>
#include <cppuhelper/weakref.hxx>
#include <vector>
 
using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;
 
namespace sd::presenter {
 
//===== CanvasUpdateRequester::Deleter ========================================
 
class CanvasUpdateRequester::Deleter
{
public:
    void operator() (CanvasUpdateRequester* pObject) { delete pObject; }
};
 
//===== CanvasUpdateRequester =================================================
 
std::shared_ptr<CanvasUpdateRequester> CanvasUpdateRequester::Instance (
    const Reference<rendering::XSpriteCanvas>& rxSharedCanvas)
{
    // this global must not own anything or we crash on shutdown
    static std::vector<std::pair<
        uno::WeakReference<rendering::XSpriteCanvas>,
        std::weak_ptr<CanvasUpdateRequester>>> s_RequesterMap;
    for (auto it = s_RequesterMap.begin(); it != s_RequesterMap.end(); )
    {
        uno::Reference<rendering::XSpriteCanvas> const xCanvas(it->first);
        if (!xCanvas.is())
        {
            it = s_RequesterMap.erase(it); // remove stale entry
        }
        else if (xCanvas == rxSharedCanvas)
        {
            std::shared_ptr<CanvasUpdateRequester> pRequester(it->second);
            if (pRequester)
            {
                return pRequester;
            }
            else
            {
                std::shared_ptr<CanvasUpdateRequester> const pNew(
                        new CanvasUpdateRequester(rxSharedCanvas), Deleter());
                it->second = pNew;
                return pNew;
            }
        }
        else
        {
            ++it;
        }
    }
 
    // No requester for the given canvas found.  Create a new one.
    std::shared_ptr<CanvasUpdateRequester> pRequester (
        new CanvasUpdateRequester(rxSharedCanvas), Deleter());
    s_RequesterMap.emplace_back(rxSharedCanvas, pRequester);
    return pRequester;
}
 
 
CanvasUpdateRequester::CanvasUpdateRequester (
        const Reference<rendering::XSpriteCanvas>& rxCanvas)
    : mxCanvas(rxCanvas)
    , m_pUserEventId(nullptr)
    , mbUpdateFlag(false)
{
    Reference<lang::XComponent> xComponent (mxCanvas, UNO_QUERY);
    if (xComponent.is())
    {
        //xComponent->addEventListener(this);
    }
}
 
CanvasUpdateRequester::~CanvasUpdateRequester()
{
    assert(m_pUserEventId == nullptr);
}
 
void CanvasUpdateRequester::RequestUpdate (const bool bUpdateAll)
{
    if (m_pUserEventId == nullptr)
    {
        m_pThis = shared_from_this(); // keep instance alive until dispatch
        mbUpdateFlag = bUpdateAll;
        m_pUserEventId = Application::PostUserEvent(LINK(this, CanvasUpdateRequester, Callback));
    }
    else
    {
        mbUpdateFlag |= bUpdateAll;
    }
}
 
IMPL_LINK_NOARG(CanvasUpdateRequester, Callback, void*, void)
{
    m_pUserEventId = nullptr;
    if (mxCanvas.is())
    {
        mxCanvas->updateScreen(mbUpdateFlag);
        mbUpdateFlag = false;
    }
    assert(m_pThis);
    m_pThis.reset(); // possibly delete "this"
}
 
} // end of namespace ::sd::presenter
 
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