galleryslideview.cpp

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// C++
#include <utility>
 
// MythTV
#include "libmythbase/mythcorecontext.h"
#include "libmythbase/mythlogging.h"
#include "libmythui/mythdialogbox.h"
#include "libmythui/mythmainwindow.h"
#include "libmythui/mythuitext.h"
 
// MythFrontend
#include "galleryslideview.h"
#include "galleryviews.h"
 
#define LOC QString("Slideview: ")
 
// EXIF tag 0x9286 UserComment can contain garbage
static QString clean_comment(const QString &comment)
{
    QString result;
    std::copy_if(comment.cbegin(), comment.cend(), std::back_inserter(result), [](QChar x) { return x.isPrint(); } );
    return result;
}
 
GallerySlideView::GallerySlideView(MythScreenStack *parent, const char *name,
                                   bool editsAllowed)
    : MythScreenType(parent, name),
      m_mgr(ImageManagerFe::getInstance()),
      m_availableTransitions(GetMythPainter()->SupportsAnimation()),
      m_transition(m_availableTransitions.Select(
                       gCoreContext->GetNumSetting("GalleryTransitionType",
                                                   kBlendTransition))),
      m_infoList(*this),
      m_slideShowTime(gCoreContext->GetDurSetting<std::chrono::milliseconds>("GallerySlideShowTime", 3s)),
      m_showCaptions(gCoreContext->GetBoolSetting("GalleryShowSlideCaptions", true)),
      m_editsAllowed(editsAllowed)
{
    // Detect when transitions finish. Queued signal to allow redraw/pulse to
    // complete before handling event.
    connect(&m_transition, &Transition::finished,
            this, &GallerySlideView::TransitionComplete, Qt::QueuedConnection);
    connect(&m_updateTransition, &Transition::finished,
            this, &GallerySlideView::TransitionComplete, Qt::QueuedConnection);
 
    // Initialise slideshow timer
    m_timer.setSingleShot(true);
    m_timer.setInterval(m_slideShowTime);
    connect(&m_timer, &QTimer::timeout,
            this, qOverload<>(&GallerySlideView::ShowNextSlide));
 
    // Initialise status delay timer
    m_delay.setSingleShot(true);
    m_delay.setInterval(gCoreContext->GetDurSetting<std::chrono::milliseconds>("GalleryStatusDelay", 0s));
    connect(&m_delay, &QTimer::timeout, this, &GallerySlideView::ShowStatus);
 
    MythMainWindow::DisableScreensaver();
    LOG(VB_GUI, LOG_DEBUG, "Created Slideview");
}
 
 
GallerySlideView::~GallerySlideView()
{
    delete m_view;
    MythMainWindow::RestoreScreensaver();
    LOG(VB_GUI, LOG_DEBUG, "Deleted Slideview");
}
 
 
bool GallerySlideView::Create()
{
    if (!LoadWindowFromXML("image-ui.xml", "slideshow", this))
        return false;
 
    // Get widgets from XML
    bool err = false;
    UIUtilE::Assign(this, m_uiImage, "image", &err);
    UIUtilW::Assign(this, m_uiStatus, "status");
    UIUtilW::Assign(this, m_uiSlideCount, "slidecount");
    UIUtilW::Assign(this, m_uiCaptionText, "caption");
    UIUtilW::Assign(this, m_uiHideCaptions, "hidecaptions");
 
    if (err)
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Cannot load screen 'Slideshow'");
        return false;
    }
 
    // Initialise details list
    if (!m_infoList.Create(true))
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + "Cannot load 'Info buttonlist'");
        return false;
    }
 
    // Create display buffer
    m_slides.Initialise(*m_uiImage);
 
    if (m_uiHideCaptions)
        m_uiHideCaptions->SetText(m_showCaptions ? "" : tr("Hide"));
 
    BuildFocusList();
    SetFocusWidget(m_uiImage);
 
    // Detect when slides are available for display.
    // Queue so that keypress events always complete before transition starts
    connect(&m_slides, &SlideBuffer::SlideReady,
            this, &GallerySlideView::SlideAvailable, Qt::QueuedConnection);
 
    return true;
}
 
 
void GallerySlideView::Pulse()
{
    // Update transition animations
    m_transition.Pulse();
    MythScreenType::Pulse();
}
 
 
bool GallerySlideView::keyPressEvent(QKeyEvent *event)
{
    if (GetFocusWidget()->keyPressEvent(event))
        return true;
 
    QStringList actions;
    bool handled = GetMythMainWindow()->TranslateKeyPress("Images", event, actions);
 
    for (int i = 0; i < actions.size() && !handled; i++)
    {
        const QString& action = actions[i];
        handled = true;
 
        if (action == "LEFT")
            ShowPrevSlide(1);
        else if (action == "RIGHT")
            ShowNextSlide(1);
        else if (action == "UP")
            ShowPrevSlide(10);
        else if (action == "DOWN")
            ShowNextSlide(10);
        else if (action == "INFO")
            ShowInfo();
        else if (action == "MENU")
            MenuMain();
        else if (action == "PLAY")
        {
            if (m_playing)
                Stop();
            else
                Play();
        }
        else if (action == "SELECT")
        {
            PlayVideo();
        }
        else if (action == "STOP")
        {
            Stop();
        }
        else if (action == "ROTRIGHT")
        {
            Transform(kRotateCW);
        }
        else if (action == "ROTLEFT")
        {
            Transform(kRotateCCW);
        }
        else if (action == "FLIPHORIZONTAL")
        {
            Transform(kFlipHorizontal);
        }
        else if (action == "FLIPVERTICAL")
        {
            Transform(kFlipVertical);
        }
        else if (action == "ZOOMIN")
        {
            Zoom(10);
        }
        else if (action == "ZOOMOUT")
        {
            Zoom(-10);
        }
        else if (action == "FULLSIZE")
        {
            Zoom();
        }
        else if (action == "SCROLLUP")
        {
            Pan(QPoint(0, 100));
        }
        else if (action == "SCROLLDOWN")
        {
            Pan(QPoint(0, -100));
        }
        else if (action == "SCROLLLEFT")
        {
            Pan(QPoint(-120, 0));
        }
        else if (action == "SCROLLRIGHT")
        {
            Pan(QPoint(120, 0));
        }
        else if (action == "RECENTER")
        {
            Pan();
        }
        else if (action == "ESCAPE" && !GetMythMainWindow()->IsExitingToMain())
        {
            // Exit info details, if shown
            handled = m_infoList.Hide();
        }
        else
        {
            handled = false;
        }
    }
 
    if (!handled)
        handled = MythScreenType::keyPressEvent(event);
 
    return handled;
}
 
 
void GallerySlideView::customEvent(QEvent *event)
{
    if (event->type() == MythEvent::kMythEventMessage)
    {
        auto *me = dynamic_cast<MythEvent *>(event);
        if (me == nullptr)
            return;
 
        const QString& message = me->Message();
 
        QStringList extra = me->ExtraDataList();
 
        if (message == "IMAGE_METADATA" && !extra.isEmpty())
        {
            int id = extra[0].toInt();
            ImagePtrK selected = m_view->GetSelected();
 
            if (selected && selected->m_id == id)
                m_infoList.Display(*selected, extra.mid(1));
        }
        else if (message == "THUMB_AVAILABLE")
        {
            if (!extra.isEmpty() && m_view->Update(extra[0].toInt()))
                ShowSlide(0);
        }
    }
    else if (event->type() == DialogCompletionEvent::kEventType)
    {
        auto *dce = (DialogCompletionEvent *)(event);
 
        QString resultid  = dce->GetId();
        int     buttonnum = dce->GetResult();
 
        if (resultid == "metadatamenu")
        {
            switch (buttonnum)
            {
            case 0: Transform(kRotateCW); break;
            case 1: Transform(kRotateCCW); break;
            case 2: Transform(kFlipHorizontal); break;
            case 3: Transform(kFlipVertical); break;
            case 4: Transform(kResetToExif); break;
            case 5: Zoom(10); break;
            case 6: Zoom(-10); break;
            }
        }
    }
}
 
 
void GallerySlideView::MenuMain()
{
    // Create the main menu that will contain the submenus above
    auto *menu = new MythMenu(tr("Slideshow Options"), this, "mainmenu");
 
    ImagePtrK im = m_slides.GetCurrent().GetImageData();
    if (im && im->m_type == kVideoFile)
        menu->AddItem(tr("Play Video"), qOverload<>(&GallerySlideView::PlayVideo));
 
    if (m_playing)
        menu->AddItem(tr("Stop"), &GallerySlideView::Stop);
    else
        menu->AddItem(tr("Start SlideShow"), qOverload<>(&GallerySlideView::Play));
 
    if (gCoreContext->GetBoolSetting("GalleryRepeat", false))
        menu->AddItem(tr("Turn Repeat Off"), &GallerySlideView::RepeatOff);
    else
        menu->AddItem(tr("Turn Repeat On"), qOverload<>(&GallerySlideView::RepeatOn));
 
    MenuTransforms(*menu);
 
    if (m_uiHideCaptions)
    {
        if (m_showCaptions)
            menu->AddItem(tr("Hide Captions"), &GallerySlideView::HideCaptions);
        else
            menu->AddItem(tr("Show Captions"), &GallerySlideView::ShowCaptions);
    }
 
    QString details;
    switch (m_infoList.GetState())
    {
    case kBasicInfo: details = tr("More Details"); break;
    case kFullInfo:  details = tr("Less Details"); break;
    default:
    case kNoInfo:    details = tr("Show Details"); break;
    }
    menu->AddItem(details, &GallerySlideView::ShowInfo);
 
    if (m_infoList.GetState() != kNoInfo)
        menu->AddItem(tr("Hide Details"), &GallerySlideView::HideInfo);
 
    MythScreenStack *popupStack = GetMythMainWindow()->GetStack("popup stack");
    auto *menuPopup = new MythDialogBox(menu, popupStack, "menuPopup");
    if (menuPopup->Create())
        popupStack->AddScreen(menuPopup);
    else
        delete menuPopup;
}
 
 
void GallerySlideView::MenuTransforms(MythMenu &mainMenu)
{
    ImagePtrK im = m_slides.GetCurrent().GetImageData();
    if (im && !m_playing)
    {
        auto *menu = new MythMenu(tr("Transform Options"),
                                      this, "metadatamenu");
        if (m_editsAllowed)
        {
            menu->AddItem(tr("Rotate CW"));
            menu->AddItem(tr("Rotate CCW"));
            menu->AddItem(tr("Flip Horizontal"));
            menu->AddItem(tr("Flip Vertical"));
            menu->AddItem(tr("Reset to Exif"));
        }
 
        if (m_slides.GetCurrent().CanZoomIn())
            menu->AddItem(tr("Zoom In"));
 
        if (m_slides.GetCurrent().CanZoomOut())
            menu->AddItem(tr("Zoom Out"));
 
        mainMenu.AddItem(tr("Transforms"), nullptr, menu);
    }
}
 
 
void GallerySlideView::Start(ImageSlideShowType type, int parentId, int selectedId)
{
    gCoreContext->addListener(this);
 
    if (type == kBrowseSlides)
    {
        // Browsing views a single ordered directory
        m_view = new FlatView(kOrdered);
 
        // Load db images
        m_view->LoadFromDb(parentId);
 
        // Display current selection, falling back to first
        m_view->Select(selectedId);
 
        // Display slide immediately
        ShowSlide();
    }
    else
    {
        int orderInt = gCoreContext->GetNumSetting("GallerySlideOrder", kOrdered);
 
        SlideOrderType order = (orderInt < kOrdered) || (orderInt > kSeasonal)
                ? kOrdered
                : static_cast<SlideOrderType>(orderInt);
 
        // Recursive uses a view of a directory subtree; Normal views a single directory
        m_view = (type == kRecursiveSlideShow) ? new TreeView(order)
                                               : new FlatView(order);
        // Load db images
        m_view->LoadFromDb(parentId);
 
        // Ordered views start from selected image
        if (order == kOrdered)
            // Adjust view so that slideshows show count rather than position
            m_view->Rotate(selectedId);
 
        // No transition for first image
        Play(false);
    }
}
 
 
void GallerySlideView::Close()
{
    gCoreContext->removeListener(this);
 
    // Stop further loads
    m_slides.Teardown();
 
    // Update gallerythumbview selection
    ImagePtrK im = m_view->GetSelected();
    if (im)
        emit ImageSelected(im->m_id);
 
    MythScreenType::Close();
}
 
 
void GallerySlideView::Stop()
{
    m_playing = false;
    m_timer.stop();
    SetStatus(tr("Stopped"));
}
 
 
void GallerySlideView::Play(bool useTransition)
{
    // Start from next slide
    ShowNextSlide(1, useTransition);
 
    m_playing = true;
    if (!m_suspended)
        m_timer.start();
    SetStatus(tr("Playing"), true);
}
 
 
void GallerySlideView::Suspend()
{
    m_timer.stop();
    m_suspended = true;
}
 
 
void GallerySlideView::Release()
{
    m_suspended = false;
    if (m_playing)
        m_timer.start();
}
 
 
void GallerySlideView::Transform(ImageFileTransform state)
{
    ImagePtrK im = m_view->GetSelected();
    if (im && !m_playing)
    {
        ImageIdList list;
        list.append(im->m_id);
        QString err = m_mgr.ChangeOrientation(state, list);
        if (!err.isEmpty())
            ShowOkPopup(err);
    }
}
 
 
void GallerySlideView::Zoom(int increment)
{
    if (!m_playing)
        m_slides.GetCurrent().Zoom(increment);
}
 
 
void GallerySlideView::Pan(QPoint offset)
{
    if (!m_playing)
        m_slides.GetCurrent().Pan(offset);
}
 
 
void GallerySlideView::ShowInfo()
{
    m_infoList.Toggle(m_slides.GetCurrent().GetImageData());
}
 
 
void GallerySlideView::HideInfo()
{
    m_infoList.Hide();
}
 
 
void GallerySlideView::ShowCaptions()
{
    m_showCaptions = true;
    m_uiHideCaptions->Reset();
}
 
 
void GallerySlideView::HideCaptions()
{
    m_showCaptions = false;
    m_uiHideCaptions->SetText(tr("Hide"));
}
 
 
void GallerySlideView::ShowSlide(int direction)
{
    ImagePtrK im = m_view->GetSelected();
    if (!im)
        // Reached view limits
        return;
 
    LOG(VB_FILE, LOG_DEBUG, LOC + QString("Selected %1").arg(im->m_filePath));
 
    // Suspend the timer until the transition has finished
    Suspend();
 
    // Load image from file
    if (!m_slides.Load(im, direction))
        // Image not yet available: show loading status
        SetStatus(tr("Loading"), true);
}
 
 
void GallerySlideView::SlideAvailable(int count)
{
    // Transition speed = 0.5x for every slide waiting. Min = 1x, Max = Half buffer size
    float speed = 0.5 + (count / 2.0);
 
    // Are we transitioning ?
    if (m_transitioning)
    {
        // More slides waiting for display: accelerate current transition
        LOG(VB_FILE, LOG_DEBUG, LOC + QString("Changing speed to %1").arg(speed));
        m_transition.SetSpeed(speed);
        return;
    }
 
    // We've been waiting for this slide: transition immediately
    m_transitioning = true;
 
    // Take next slide
    Slide &next = m_slides.GetNext();
 
    // Update loading status
    ClearStatus(next);
 
    // Update slide counts
    if (m_uiSlideCount)
        m_uiSlideCount->SetText(m_view->GetPosition());
 
    int direction = next.GetDirection();
 
    // Use instant transition for start-up & updates (dir = 0)
    // and browsing with transitions turned off
    Transition &transition =
            (direction != 0 &&
             (m_playing || gCoreContext->GetBoolSetting("GalleryBrowseTransition", false)))
            ? m_transition : m_updateTransition;
 
    // Reset any zoom before starting transition
    Zoom();
    transition.Start(m_slides.GetCurrent(), next, direction >= 0, speed);
}
 
 
void GallerySlideView::TransitionComplete()
{
    if (m_isDeleting)
        return;
 
    m_transitioning = false;
 
    // Release old slide, which may start a new transition
    m_slides.ReleaseCurrent();
 
    // No further actions when skipping
    // cppcheck-suppress knownConditionTrueFalse
    if (m_transitioning)
        return;
 
    // Preload next slide, if any
    m_slides.Preload(m_view->HasNext(1));
 
    // Populate display for new slide
    ImagePtrK im  = m_slides.GetCurrent().GetImageData();
 
    // Update any file details information
    m_infoList.Update(im);
 
    if (im && m_uiCaptionText)
    {
        // show the date & comment
        QStringList text;
        text << ImageManagerFe::LongDateOf(im);
 
        QString comment = clean_comment(im->m_comment);
        if (!comment.isEmpty())
            text << comment;
 
        m_uiCaptionText->SetText(text.join(" - "));
    }
 
    // Start any video unless we're paused or browsing
    if (im && im->m_type == kVideoFile)
    {
        if (m_playing)
            PlayVideo();
        else
            SetStatus(tr("Video"));
    }
 
    // Resume slideshow timer
    Release();
}
 
 
void GallerySlideView::ShowPrevSlide(int inc)
{
    if (m_playing && m_view->HasPrev(inc) == nullptr)
    {
        // Prohibit back-wrapping during slideshow: it will cause premature end
        //: Cannot go back beyond first slide of slideshow
        SetStatus(tr("Start"));
    }
    else if (m_view->Prev(inc))
    {
        ShowSlide(-1);
    }
}
 
 
void GallerySlideView::ShowNextSlide(int inc, bool useTransition)
{
    // Browsing always wraps; slideshows depend on repeat setting
    if (m_playing && m_view->HasNext(inc) == nullptr
            && !gCoreContext->GetBoolSetting("GalleryRepeat", false))
    {
        // Don't stop due to jumping past end
        if (inc == 1)
        {
            Stop();
            //: Slideshow has reached last slide
            SetStatus(tr("End"));
        }
    }
    else if (m_view->Next(inc))
    {
        ShowSlide(useTransition ? 1 : 0);
    }
    else
    {
        // No images
        Stop();
        m_infoList.Hide();
        m_slides.GetCurrent().Clear();
        if (m_uiSlideCount)
            m_uiSlideCount->SetText("0/0");
        if (m_uiCaptionText)
            m_uiCaptionText->Reset();
    }
}
void GallerySlideView::ShowNextSlide(void)
{
    ShowNextSlide(1, true);
}
 
 
void GallerySlideView::PlayVideo()
{
    if (m_slides.GetCurrent().FailedLoad())
        return;
 
    ImagePtrK im = m_slides.GetCurrent().GetImageData();
 
    if (im && im->m_type == kVideoFile)
        GetMythMainWindow()->HandleMedia("Internal", im->m_url);
}
 
 
void GallerySlideView::SetStatus(QString msg, bool delay)
{
    m_statusText = std::move(msg);
    if (m_uiStatus)
    {
        if (delay)
            m_delay.start();
        else
            ShowStatus();
    }
}
 
 
void GallerySlideView::ShowStatus()
{
    if (m_uiStatus)
        m_uiStatus->SetText(m_statusText);
}
 
 
void GallerySlideView::ClearStatus(const Slide &slide)
{
    if (m_uiStatus)
    {
        m_delay.stop();
 
        if (slide.FailedLoad())
        {
            ImagePtrK im = slide.GetImageData();
            SetStatus(tr("Failed to load %1").arg(im ? im->m_filePath : "?"));
        }
        else
        {
            m_uiStatus->Reset();
        }
    }
}
 
void GallerySlideView::RepeatOn(int on)
{
    gCoreContext->SaveSetting("GalleryRepeat", on);
}