/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


#include "controller/SlsPageSelector.hxx"

#include "SlideSorter.hxx"
#include "SlideSorterViewShell.hxx"
#include "controller/SlideSorterController.hxx"
#include "controller/SlsSelectionManager.hxx"
#include "controller/SlsAnimator.hxx"
#include "controller/SlsCurrentSlideManager.hxx"
#include "controller/SlsVisibleAreaManager.hxx"
#include "model/SlsPageDescriptor.hxx"
#include "model/SlsPageEnumerationProvider.hxx"
#include "model/SlideSorterModel.hxx"
#include "view/SlideSorterView.hxx"

#include "sdpage.hxx"
#include "ViewShell.hxx"
#include "DrawViewShell.hxx"
#include "ViewShellBase.hxx"
#include <com/sun/star/drawing/XDrawView.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>
#include <boost/shared_ptr.hpp>


using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;
using namespace ::sd::slidesorter::model;
using namespace ::sd::slidesorter::view;


namespace sd { namespace slidesorter { namespace controller {

PageSelector::PageSelector (SlideSorter& rSlideSorter)
    : mrModel(rSlideSorter.GetModel()),
      mrSlideSorter(rSlideSorter),
      mrController(mrSlideSorter.GetController()),
      mnSelectedPageCount(0),
      mnBroadcastDisableLevel(0),
      mbSelectionChangeBroadcastPending(false),
      mpMostRecentlySelectedPage(),
      mpSelectionAnchor(),
      mpCurrentPage(),
      mnUpdateLockCount(0),
      mbIsUpdateCurrentPagePending(false)
{
    CountSelectedPages ();
}




void PageSelector::SelectAllPages (void)
{
    VisibleAreaManager::TemporaryDisabler aDisabler (mrSlideSorter);
    PageSelector::UpdateLock aLock (*this);

    int nPageCount = mrModel.GetPageCount();
    for (int nPageIndex=0; nPageIndex<nPageCount; nPageIndex++)
        SelectPage(nPageIndex);
}




void PageSelector::DeselectAllPages (void)
{
    VisibleAreaManager::TemporaryDisabler aDisabler (mrSlideSorter);
    PageSelector::UpdateLock aLock (*this);

    int nPageCount = mrModel.GetPageCount();
    for (int nPageIndex=0; nPageIndex<nPageCount; nPageIndex++)
        DeselectPage(nPageIndex);

    DBG_ASSERT (mnSelectedPageCount==0,
        "PageSelector::DeselectAllPages: the selected pages counter is not 0");
    mnSelectedPageCount = 0;
    mpSelectionAnchor.reset();
}




void PageSelector::GetCoreSelection (void)
{
    PageSelector::UpdateLock aLock (*this);

    bool bSelectionHasChanged (true);
    mnSelectedPageCount = 0;
    model::PageEnumeration aAllPages (
        model::PageEnumerationProvider::CreateAllPagesEnumeration(mrModel));
    while (aAllPages.HasMoreElements())
    {
        model::SharedPageDescriptor pDescriptor (aAllPages.GetNextElement());
        if (pDescriptor->GetCoreSelection())
        {
            mrSlideSorter.GetController().GetVisibleAreaManager().RequestVisible(pDescriptor);
            mrSlideSorter.GetView().RequestRepaint(pDescriptor);
            bSelectionHasChanged = true;
        }

        if (pDescriptor->HasState(PageDescriptor::ST_Selected))
            mnSelectedPageCount++;
    }

    if (bSelectionHasChanged)
    {
        if (mnBroadcastDisableLevel > 0)
            mbSelectionChangeBroadcastPending = true;
        else
            mrController.GetSelectionManager()->SelectionHasChanged();
    }
}




void PageSelector::SetCoreSelection (void)
{
    model::PageEnumeration aAllPages (
        model::PageEnumerationProvider::CreateAllPagesEnumeration(mrModel));
    while (aAllPages.HasMoreElements())
    {
        model::SharedPageDescriptor pDescriptor (aAllPages.GetNextElement());
        pDescriptor->SetCoreSelection();
    }
}




void PageSelector::SelectPage (int nPageIndex)
{
    SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nPageIndex));
    if (pDescriptor.get() != NULL)
        SelectPage(pDescriptor);
}




void PageSelector::SelectPage (const SdPage* pPage)
{
    const sal_Int32 nPageIndex (mrModel.GetIndex(pPage));
    SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nPageIndex));
    if (pDescriptor.get()!=NULL && pDescriptor->GetPage()==pPage)
        SelectPage(pDescriptor);
}




void PageSelector::SelectPage (const SharedPageDescriptor& rpDescriptor)
{
    if (rpDescriptor.get()!=NULL
        && mrSlideSorter.GetView().SetState(rpDescriptor, PageDescriptor::ST_Selected, true))
    {
        ++mnSelectedPageCount;
        mrSlideSorter.GetController().GetVisibleAreaManager().RequestVisible(rpDescriptor,true);
        mrSlideSorter.GetView().RequestRepaint(rpDescriptor);

        mpMostRecentlySelectedPage = rpDescriptor;
        if (mpSelectionAnchor == 0)
            mpSelectionAnchor = rpDescriptor;

        if (mnBroadcastDisableLevel > 0)
            mbSelectionChangeBroadcastPending = true;
        else
            mrController.GetSelectionManager()->SelectionHasChanged();
        UpdateCurrentPage();

        CheckConsistency();
    }
}




void PageSelector::DeselectPage (
    int nPageIndex,
    const bool bUpdateCurrentPage)
{
    model::SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nPageIndex));
    if (pDescriptor.get() != NULL)
        DeselectPage(pDescriptor, bUpdateCurrentPage);
}




void PageSelector::DeselectPage (
    const SharedPageDescriptor& rpDescriptor,
    const bool bUpdateCurrentPage)
{
    if (rpDescriptor.get()!=NULL
        && mrSlideSorter.GetView().SetState(rpDescriptor, PageDescriptor::ST_Selected, false))
    {
        --mnSelectedPageCount;
        mrSlideSorter.GetController().GetVisibleAreaManager().RequestVisible(rpDescriptor);
        mrSlideSorter.GetView().RequestRepaint(rpDescriptor);
        if (mpMostRecentlySelectedPage == rpDescriptor)
            mpMostRecentlySelectedPage.reset();
        if (mnBroadcastDisableLevel > 0)
            mbSelectionChangeBroadcastPending = true;
        else
            mrController.GetSelectionManager()->SelectionHasChanged();
        if (bUpdateCurrentPage)
            UpdateCurrentPage();

        CheckConsistency();
    }
}




void PageSelector::CheckConsistency (void) const
{
    int nSelectionCount (0);
    for (int nPageIndex=0,nPageCount=mrModel.GetPageCount(); nPageIndex<nPageCount; nPageIndex++)
    {
        SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nPageIndex));
        assert(pDescriptor);
        if (pDescriptor->HasState(PageDescriptor::ST_Selected))
            ++nSelectionCount;
    }
    if (nSelectionCount!=mnSelectedPageCount)
    {
        // #i120020# The former call to assert(..) internally calls
        // SlideSorterModel::GetPageDescriptor which will crash in this situation
        // (only in non-pro code). All what is wanted there is to assert it (the
        // error is already detected), so do this directly.
        OSL_ENSURE(false, "PageSelector: Consistency error (!)");
    }
}




bool PageSelector::IsPageSelected (int nPageIndex)
{
    SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nPageIndex));
    if (pDescriptor.get() != NULL)
        return pDescriptor->HasState(PageDescriptor::ST_Selected);
    else
        return false;
}




int PageSelector::GetPageCount (void) const
{
    return mrModel.GetPageCount();
}




int PageSelector::GetSelectedPageCount (void) const
{
    return mnSelectedPageCount;
}




SharedPageDescriptor PageSelector::GetSelectionAnchor (void) const
{
    return mpSelectionAnchor;
}




void PageSelector::CountSelectedPages (void)
{
    mnSelectedPageCount = 0;
    model::PageEnumeration aSelectedPages (
        model::PageEnumerationProvider::CreateSelectedPagesEnumeration(mrModel));
    while (aSelectedPages.HasMoreElements())
    {
        mnSelectedPageCount++;
        aSelectedPages.GetNextElement();
    }
}




void PageSelector::EnableBroadcasting (void)
{
    if (mnBroadcastDisableLevel > 0)
        mnBroadcastDisableLevel --;
    if (mnBroadcastDisableLevel==0 && mbSelectionChangeBroadcastPending)
    {
        mrController.GetSelectionManager()->SelectionHasChanged();
        mbSelectionChangeBroadcastPending = false;
    }
}




void PageSelector::DisableBroadcasting (void)
{
    mnBroadcastDisableLevel ++;
}




::boost::shared_ptr<PageSelector::PageSelection> PageSelector::GetPageSelection (void) const
{
    ::boost::shared_ptr<PageSelection> pSelection (new PageSelection());
    pSelection->reserve(GetSelectedPageCount());

    int nPageCount = GetPageCount();
    for (int nIndex=0; nIndex<nPageCount; nIndex++)
    {
        SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nIndex));
        if (pDescriptor.get()!=NULL && pDescriptor->HasState(PageDescriptor::ST_Selected))
            pSelection->push_back(pDescriptor->GetPage());
    }

    return pSelection;
}




void PageSelector::SetPageSelection (
    const ::boost::shared_ptr<PageSelection>& rpSelection,
    const bool bUpdateCurrentPage)
{
    PageSelection::const_iterator iPage;
    for (iPage=rpSelection->begin(); iPage!=rpSelection->end(); ++iPage)
        SelectPage(*iPage);
    if (bUpdateCurrentPage)
        UpdateCurrentPage();
}




void PageSelector::UpdateCurrentPage (const bool bUpdateOnlyWhenPending)
{
    if (mnUpdateLockCount > 0)
    {
        mbIsUpdateCurrentPagePending = true;
        return;
    }

    if ( ! mbIsUpdateCurrentPagePending && bUpdateOnlyWhenPending)
        return;

    mbIsUpdateCurrentPagePending = false;

    // Make the first selected page the current page.
    const sal_Int32 nPageCount (GetPageCount());
    for (sal_Int32 nIndex=0; nIndex<nPageCount; ++nIndex)
    {
        SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(nIndex));
        if (pDescriptor && pDescriptor->HasState(PageDescriptor::ST_Selected))
        {
            // Switching the current slide normally sets also the selection
            // to just the new current slide.  To prevent that, we store
            // (and at the end of this scope restore) the current selection.
            ::boost::shared_ptr<PageSelection> pSelection (GetPageSelection());

            mrController.GetCurrentSlideManager()->SwitchCurrentSlide(pDescriptor);

            // Restore the selection and prevent a recursive call to
            // UpdateCurrentPage().
            SetPageSelection(pSelection, false);
            return;
        }
    }

    // No page is selected.  Do not change the current slide.
}




//===== PageSelector::UpdateLock ==============================================

PageSelector::UpdateLock::UpdateLock (SlideSorter& rSlideSorter)
    : mpSelector(&rSlideSorter.GetController().GetPageSelector())
{
    ++mpSelector->mnUpdateLockCount;
}




PageSelector::UpdateLock::UpdateLock (PageSelector& rSelector)
    : mpSelector(&rSelector)
{
    ++mpSelector->mnUpdateLockCount;
}




PageSelector::UpdateLock::~UpdateLock (void)
{
    Release();
}

void PageSelector::UpdateLock::Release (void)
{
    if (mpSelector != NULL)
    {
        --mpSelector->mnUpdateLockCount;
        OSL_ASSERT(mpSelector->mnUpdateLockCount >= 0);
        if (mpSelector->mnUpdateLockCount == 0)
            mpSelector->UpdateCurrentPage(true);

        mpSelector = NULL;
    }
}




//===== PageSelector::BroadcastLock ==============================================

PageSelector::BroadcastLock::BroadcastLock (SlideSorter& rSlideSorter)
    : mrSelector(rSlideSorter.GetController().GetPageSelector())
{
    mrSelector.DisableBroadcasting();
}




PageSelector::BroadcastLock::BroadcastLock (PageSelector& rSelector)
    : mrSelector(rSelector)
{
    mrSelector.DisableBroadcasting();
}




PageSelector::BroadcastLock::~BroadcastLock (void)
{
    mrSelector.EnableBroadcasting();
}

} } } // end of namespace ::sd::slidesorter::controller

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */