qmlprinter.cpp 12.6 KB
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#include "qmlprinter.h"

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#include <QLoggingCategory>
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#include <QAbstractTextDocumentLayout>
#include <QPainter>
#include <QPrinter>
#include <QQuickItem>
#include <QQuickWindow>
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#include <QtMath>
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#include <QQuickItemGrabResult>
#include <QGuiApplication>
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Q_LOGGING_CATEGORY(lc, "qt.qmlprinter")

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QmlPrinter::QmlPrinter() {}
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QmlPrinter::~QmlPrinter() {}
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void QmlPrinter::changePrinterOrientation(QPrinter &printer, const int &width,
                                          const int &height) {
  if (width > height)
    printer.setOrientation(QPrinter::Landscape);
  else
    printer.setOrientation(QPrinter::Portrait);
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}
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bool QmlPrinter::printPdf(const QString &location, QQuickItem *rootItem) {
  if (!rootItem) {
      return false;
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  }
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  auto width = rootItem->property("width").toInt();
  auto height = rootItem->property("height").toInt();
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  QPrinter printer(QPrinter::HighResolution);
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  printer.setOutputFormat(QPrinter::PdfFormat);
  printer.setOutputFileName(location);
  printer.setFullPage(true);
  printer.setPageLayout(QPageLayout(QPageSize(QSize(height, width)),
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                                    QPageLayout::Landscape,
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                                    QMarginsF(0, 0, 0, 0), QPageLayout::Pica));
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  printer.setResolution(resolution());
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  // Change the printer orientation based on the presentation
  // This needs to be called before the painting is started as it will only take
  // effect after newPage is called (painter.begin() calls this method)
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  changePrinterOrientation(printer, width, height);
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  SubItemStrategy strategy;
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  ///@todo create other strategies for generating a PDF from a QuickItem,
  ///  e.g. by using
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/*
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  PrintStrategy strategy = [](QQuickItem* root, ItemList& items, ItemList& masterItems) {
      items.push_back({ root, QVariantMap() });
      return true;
  };
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*/
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  return printItems(printer,rootItem,strategy);
}

bool QmlPrinter::printItems(QPrinter& printer, ItemList const& items,
                            ItemList const& masterItems) const {
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  QPainter painter;
  // It's possible to fail here for example if the file location does not allow
  // writing
  if (!painter.begin(&printer)) {
    return false;
  }
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  for (size_t i = 0; i < items.size(); ++i) {
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      auto item = items.at(i).item;
      if (!item->property("noMaster").toBool()) {
           // Paint master slide elements
            for (auto &masterItem : masterItems) {
              masterItem.item->setProperty("slideNumber",int(i+1));
              paintItem(masterItem, &painter);
            }
      }
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      // Paint current slide
      paintItem(items.at(i), &painter);
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      // We need to lookahead so we can setup the printer orientation for the next
      // item and add a new page to the printer
      size_t next = i + 1;
      if (next < items.size()) {
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      changePrinterOrientation(printer,
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                               int(items.at(next).item->width()),
                               int(items.at(next).item->height()));
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      printer.newPage();
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    }
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  }
  return true;
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}

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bool QmlPrinter::printItems(QPrinter &printer, QQuickItem *rootItem, PrintStrategy strategy) const
{
  ItemList items, masterItems;
  if (!strategy(rootItem,items,masterItems)) {
    return false;
  }

  return printItems(printer,items,masterItems);

}

int QmlPrinter::resolution() const
{
    return m_options.count("resolution") ? m_options.value("resolution").toInt() : 72;
}

void QmlPrinter::setResolution(int resolution)
{
    m_options["resolution"] = resolution;
}

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void QmlPrinter::paintItem(QQuickItem *item, QQuickWindow *window,
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                           QPainter *painter) const {
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  if (!item || !item->isVisible())
    return;

  bool drawChildren = true;

  painter->save();
  painter->setMatrix(transformMatrix(item));
  painter->setMatrixEnabled(true);
  if (item->clip()) {
    painter->setClipping(true);
    painter->setClipRect(item->clipRect());
  }

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  if (inherits(item->metaObject(), "QQuickRow") ||
      inherits(item->metaObject(), "QQuickColumn")) {
      QMetaObject::invokeMethod(item,"forceLayout");
  }
  item->update();
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  // This is a bit special case as we need to use childItems instead of children
  if (inherits(item->metaObject(), "QQuickListView")) {
    drawChildren = false;
    QList<QQuickItem *> childItems = item->childItems();
    if (childItems.length() > 0) {
      // First item is the QML ListView
      QQuickItem *listView = childItems.at(0);
      if (listView != nullptr) {
        // Draw the child items of the QML ListView
        QList<QQuickItem *> listViewChildren = listView->childItems();
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        for (QQuickItem *children : listViewChildren) {
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          paintItem(children, window, painter);
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        }
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      }
    }
  } else if (item->flags().testFlag(QQuickItem::ItemHasContents)) {

    if (inherits(item->metaObject(), "QQuickRectangle")) {
      paintQQuickRectangle(item, painter);
    } else if (inherits(item->metaObject(), "QQuickText")) {
      paintQQuickText(item, painter);
    } else if (inherits(item->metaObject(), "QQuickImage")) {
      paintQQuickImage(item, painter);
    } else if (inherits(item->metaObject(), "QQuickCanvasItem")) {
      paintQQuickCanvasItem(item, window, painter);
    } else {
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      // Fallback to screen capture if we are unable to parse the data
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      QRectF rect(0,0,item->width(),item->height());
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      if (window != nullptr) {
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        auto imageGrabResult = item->grabToImage(rect.size().toSize());

        bool ready = false;

        if (imageGrabResult) {
            QObject::connect( imageGrabResult.data(), &QQuickItemGrabResult::ready,
                              [&]() {
                painter->drawImage(rect, imageGrabResult->image(), rect);
                ready = true;
            });
        } else {
          ready = true;
        }

        while(!ready) { qGuiApp->processEvents(); }
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      }
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      drawChildren = false;
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    }
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  }
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  if (drawChildren) {
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    auto items = item->childItems();
    std::sort(items.begin(), items.end(), [](QQuickItem *lhs, QQuickItem *rhs) {
      return lhs->z() < rhs->z();
    });
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    for (auto item : items)
      paintItem(item, window, painter);
  }
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  painter->restore();
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}

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void QmlPrinter::paintItem(const ItemWithProperties& item, QPainter *painter) const {
    auto& props = item.properties;
    for (const auto& key : props.keys()) {
        item.item->setProperty(key.toStdString().c_str(),props.value(key));
    }
    paintItem(item.item,item.item->window(),painter);
}

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void QmlPrinter::paintQQuickCanvasItem(QQuickItem *item, QQuickWindow *window,
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                                       QPainter *painter) const {
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  // No point in continuing as we are unable to grab the image
  if (window == nullptr)
    return;
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  const QRect rect(0, 0, int(item->width()), int(item->height()));
  QImage image = window->grabWindow();
  painter->drawImage(0, 0, image, 0, 0, rect.width(), rect.height());
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}

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void QmlPrinter::paintQQuickRectangle(QQuickItem *item, QPainter *painter) const {
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  const QRectF rect(0, 0, item->width(), item->height());

  const QColor color = item->property("color").value<QColor>();
  const QObject *border = item->property("border").value<QObject *>();
  const qreal borderWidth = border->property("width").value<qreal>();
  const QColor borderColor = border->property("color").value<QColor>();
  const qreal radius = item->property("radius").value<qreal>();
  const qreal opacity = item->property("opacity").value<qreal>();

  painter->setBrush(color);
  painter->setOpacity(opacity);

  if (borderWidth > 0.0 && !(borderWidth == 1.0 && borderColor == QColor(Qt::black))) {
    painter->setPen(QPen(borderColor, borderWidth));
  } else {
    painter->setPen(Qt::NoPen);
  }

  if (radius > 0.0) {
    painter->drawRoundedRect(rect, radius, radius);
  } else {
    painter->drawRect(rect);
  }
}
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void QmlPrinter::paintQQuickText(QQuickItem *item, QPainter *painter) const {
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  const QRectF rect(0, 0, item->width(), item->height());
  const QFont font = item->property("font").value<QFont>();
  const QString text = item->property("text").value<QString>();
  const QColor color = item->property("color").value<QColor>();
  const int wrapMode = item->property("wrapMode").value<int>();
  int textFormat = item->property("textFormat").value<int>();
  const int horizontalAlignment =
      item->property("horizontalAlignment").value<int>();
  const int verticalAlignment =
      item->property("verticalAlignment").value<int>();

  QTextOption textOption;
  textOption.setWrapMode(QTextOption::WrapMode(wrapMode));
  textOption.setAlignment(
      static_cast<Qt::Alignment>(horizontalAlignment | verticalAlignment));

  QFontMetrics fm(font);

  textFormat = Qt::RichText;
  if (textFormat == Qt::AutoText) {
    textFormat = Qt::mightBeRichText(text) ? 4 : Qt::PlainText;
  }
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  item->polish();
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  QTextDocument document;
  document.setPageSize(item->size());
  document.setDocumentMargin(0.0);
  document.setUseDesignMetrics(true);
  document.setTextWidth(rect.width());
  document.setDefaultTextOption(textOption);
  document.setDefaultFont(font);

  if (textFormat == Qt::PlainText)
    document.setPlainText(text);
  else
    document.setHtml(text);

  QAbstractTextDocumentLayout::PaintContext context;
  context.palette.setColor(QPalette::Text, color);

  QAbstractTextDocumentLayout *layout = document.documentLayout();
  painter->translate(rect.topLeft());
  painter->setRenderHint(QPainter::Antialiasing, true);
  layout->draw(painter, context);
}
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void QmlPrinter::paintQQuickImage(QQuickItem *item, QPainter *painter) const {
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  const QUrl url = item->property("source").value<QUrl>();
  const int fillMode = item->property("fillMode").value<int>();

  QImage image(url.toLocalFile());

  QRectF rect(0, 0, item->width(), item->height());
  QRectF sourceRect(0, 0, image.width(), image.height());

  switch (fillMode) {
  default:
    qWarning() << "QuickItemPainter::paintQuickImage unimplemented fill mode: "
               << fillMode;
    break;
  case 0: // Image.Stretch
    break;
  case 1: { // Image.PreserveAspectFit
    QSizeF size = sourceRect.size();
    size.scale(rect.width(), rect.height(), Qt::KeepAspectRatio);
  } break;
  case 6: { // Image.Pad
    if (sourceRect.width() > rect.width()) {
      rect.setWidth(sourceRect.width());
    } else {
      sourceRect.setWidth(rect.width());
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    }
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    if (sourceRect.height() > rect.height()) {
      rect.setHeight(sourceRect.height());
    } else {
      sourceRect.setHeight(rect.height());
    }
  } break;
  }
  painter->drawImage(rect, image, sourceRect);
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}

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bool QmlPrinter::inherits(const QMetaObject *metaObject, const QString &name) {
  if (metaObject->className() == name) {
    return true;
  } else if (metaObject->superClass()) {
    return inherits(metaObject->superClass(), name);
  }
  return false;
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}

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QMatrix QmlPrinter::transformMatrix(QQuickItem *item) {

  QTransform t;
  if (item->parentItem())
    t = QTransform(transformMatrix(item->parentItem()));

  t.translate(item->x(), item->y());

  auto transforms = item->transform();
  auto tCount = transforms.count(&transforms);

  if (!tCount) {
    QMatrix4x4 m(t);
    for (int ii = tCount - 1; ii >= 0; --ii)
      transforms.at(&transforms, ii)->applyTo(&m);
    t = m.toTransform();
  }

  auto computeTransformOrigin = [](QQuickItem *item) {
    switch (item->transformOrigin()) {
    case QQuickItem::TopLeft:
      return QPointF(0, 0);
    case QQuickItem::Top:
      return QPointF(item->width() / 2., 0);
    case QQuickItem::TopRight:
      return QPointF(item->width(), 0);
    case QQuickItem::Left:
      return QPointF(0, item->height() / 2.);
    case QQuickItem::Center:
      return QPointF(item->width() / 2., item->height() / 2.);
    case QQuickItem::Right:
      return QPointF(item->width(), item->height() / 2.);
    case QQuickItem::BottomLeft:
      return QPointF(0, item->height());
    case QQuickItem::Bottom:
      return QPointF(item->width() / 2., item->height());
    case QQuickItem::BottomRight:
      return QPointF(item->width(), item->height());
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    }
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    return QPointF(0.0,0.0);
  };

  if (item->scale() != 1. || item->rotation() != 0.) {
    QPointF tp = computeTransformOrigin(item);
    t.translate(tp.x(), tp.y());
    t.scale(item->scale(), item->scale());
    t.rotate(item->rotation());
    t.translate(-tp.x(), -tp.y());
  }

  return t.toAffine();
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}
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bool SubItemStrategy::operator()(QQuickItem *rootItem, ItemList &items, ItemList &masterItems)
{
  rootItem->setProperty(
      "allowDelay",
      QVariant(false)); // Disable partial reveals on slide pages

  for (auto &item : rootItem->childItems()) {
    if (item->property("isMaster").toBool()) {
      masterItems.push_back({item, QVariantMap()});
    } else {
        if (item->metaObject()->className() != QStringLiteral("QQuickRepeater"))
            items.push_back({item, QVariantMap()});
    }
  }
  return !items.empty();
}