mirror of https://github.com/JakubMelka/PDF4QT.git
XFA: layout algorithm (WIP)
This commit is contained in:
Jakub Melka
parent
42926d37bf
commit
6b7e839618
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@ -9612,12 +9612,30 @@ public:
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void setDocument(const PDFModifiedDocument& document, PDFForm* form);
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struct LayoutItem
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{
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QRectF nominalExtent;
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const xfa::XFA_draw* draw = nullptr;
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const xfa::XFA_field* field = nullptr;
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};
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using LayoutItems = std::vector<LayoutItem>;
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void setLayoutItems(PDFInteger pageIndex, LayoutItems layoutItems) { m_layout.layoutItems[pageIndex] = std::move(layoutItems); }
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private:
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struct Layout
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{
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std::map<PDFInteger, LayoutItems> layoutItems;
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};
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void clear();
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xfa::XFA_Node<xfa::XFA_template> m_template;
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const PDFDocument* m_document;
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PDFForm* m_form;
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Layout m_layout;
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};
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class PDFXFALayoutEngine : public xfa::XFA_AbstractVisitor
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@ -9633,6 +9651,8 @@ public:
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virtual void visit(const xfa::XFA_draw* node) override;
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virtual void visit(const xfa::XFA_field* node) override;
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void performLayout(PDFXFAEngineImpl* engine, const xfa::XFA_template* node);
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private:
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enum class ContentAreaScope
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{
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@ -9675,6 +9695,26 @@ private:
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QRectF contentBox;
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};
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struct SizeInfo
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{
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/// Size of item
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QSizeF origSize;
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/// Effective size - size computed, bounded by min/max size
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QSizeF effSize;
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/// Minimal size of item
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QSizeF minSize;
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/// Maximal size of item
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QSizeF maxSize;
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QSizeF adjustNominalExtentSize(const QSizeF size);
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};
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template<typename Node>
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SizeInfo getSizeInfo(const Node* node) const;
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/// Represents single item layouted onto page (for example,
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/// field, graphics etc.). Nominal extent can be relative to the
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/// parent, or it can be absolute (if parent is a page).
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@ -9682,6 +9722,26 @@ private:
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{
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void translate(PDFReal dx, PDFReal dy) { nominalExtent.translate(dx, dy); }
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void updatePresence(xfa::XFA_BaseNode::PRESENCE presence)
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{
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switch (presence)
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{
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case xfa::XFA_BaseNode::PRESENCE::Visible:
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break;
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case xfa::XFA_BaseNode::PRESENCE::Hidden:
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case xfa::XFA_BaseNode::PRESENCE::Inactive:
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Q_ASSERT(false); // These should not be lay-out
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break;
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case xfa::XFA_BaseNode::PRESENCE::Invisible:
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presence = xfa::XFA_BaseNode::PRESENCE::Invisible;
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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}
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/// Nominal extent for this item (relative to the parent item)
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QRectF nominalExtent;
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xfa::XFA_BaseNode::PRESENCE presence = xfa::XFA_BaseNode::PRESENCE::Visible;
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@ -9697,6 +9757,11 @@ private:
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std::for_each(items.begin(), items.end(), [dx, dy](auto& item) { item.translate(dx, dy); });
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}
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void updatePresence(xfa::XFA_BaseNode::PRESENCE presence)
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{
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std::for_each(items.begin(), items.end(), [presence](auto& item) { item.updatePresence(presence); });
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}
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/// Page index (or, more precisely, index of content area)
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size_t pageIndex = 0;
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@ -9718,14 +9783,8 @@ private:
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/// layouted, then this layout is used - for direct subitems)
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xfa::XFA_BaseNode::LAYOUT layoutType = xfa::XFA_BaseNode::LAYOUT::Position;
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/// Size of actual item
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QSizeF size;
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/// Minimal size of actual item
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QSizeF minSize;
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/// Maximal size of actual item
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QSizeF maxSize;
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/// Size info
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SizeInfo sizeInfo;
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/// Actual x-offset relative to the parent container (in case of positional
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/// layout settings)
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@ -9769,6 +9828,11 @@ private:
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{
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m_engine->layout(std::move(parameters));
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}
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else
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{
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// Store final layout
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m_engine->m_layout.insert(m_engine->m_layout.end(), std::make_move_iterator(parameters.layout.begin()), std::make_move_iterator(parameters.layout.end()));
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}
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}
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private:
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@ -9787,6 +9851,7 @@ private:
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const LayoutParameters& getLayoutParameters() const { return m_layoutParameters.top(); }
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std::vector<PageInfo> m_pages;
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std::vector<Layout> m_layout;
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std::stack<LayoutParameters> m_layoutParameters;
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size_t m_currentPageIndex = 0;
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size_t m_maximalPageCount = 128;
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@ -9804,7 +9869,6 @@ void PDFXFALayoutEngine::visit(const xfa::XFA_area* node)
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node->getArea(),
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node->getDraw(),
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node->getExclGroup(),
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node->getExclGroup(),
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node->getField(),
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node->getSubform(),
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node->getSubformSet());
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@ -9828,10 +9892,147 @@ void PDFXFALayoutEngine::layout(LayoutParameters layoutParameters)
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for (Layout& layout : layoutParameters.layout)
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{
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layoutsPerPage[layout.pageIndex] = std::move(layout);
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layoutsPerPage[layout.pageIndex].emplace_back(std::move(layout));
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}
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LayoutParameters& currentLayoutParameters = getLayoutParameters();
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for (auto& item : layoutsPerPage)
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{
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const size_t pageIndex = item.first;
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std::vector<Layout> layouts = std::move(item.second);
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for (Layout& layout : layouts)
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{
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layout.updatePresence(currentLayoutParameters.presence);
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}
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switch (currentLayoutParameters.layoutType)
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{
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case xfa::XFA_BaseNode::LAYOUT::Position:
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{
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Layout finalLayout;
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finalLayout.pageIndex = pageIndex;
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PDFReal x = layoutParameters.xOffset + currentLayoutParameters.margins.left();
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PDFReal y = layoutParameters.yOffset + currentLayoutParameters.margins.top();
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for (Layout& layout : layouts)
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{
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// Jakub Melka: we must add offset from anchor type
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switch (layoutParameters.anchorType)
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{
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::TopLeft:
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::BottomCenter:
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x -= layout.nominalExtent.width() * 0.5;
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y -= layout.nominalExtent.height();
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::BottomLeft:
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y -= layout.nominalExtent.height();
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::BottomRight:
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x -= layout.nominalExtent.width();
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y -= layout.nominalExtent.height();
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::MiddleCenter:
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x -= layout.nominalExtent.width() * 0.5;
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y -= layout.nominalExtent.height() * 0.5;
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::MiddleLeft:
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y -= layout.nominalExtent.height() * 0.5;
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::MiddleRight:
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x -= layout.nominalExtent.width();
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y -= layout.nominalExtent.height() * 0.5;
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::TopCenter:
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x -= layout.nominalExtent.width() * 0.5;
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break;
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case pdf::xfa::XFA_BaseNode::ANCHORTYPE::TopRight:
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x -= layout.nominalExtent.width();
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break;
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default:
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Q_ASSERT(false);
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break;
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}
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layout.translate(x, y);
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finalLayout.items.insert(finalLayout.items.end(), layout.items.begin(), layout.items.end());
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}
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QSizeF nominalExtentSize = currentLayoutParameters.sizeInfo.effSize;
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finalLayout.nominalExtent = QRectF(QPointF(0, 0), nominalExtentSize);
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if (!finalLayout.items.empty())
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{
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currentLayoutParameters.layout.emplace_back(std::move(finalLayout));
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}
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break;
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}
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case xfa::XFA_BaseNode::LAYOUT::Lr_tb:
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break;
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case xfa::XFA_BaseNode::LAYOUT::Rl_row:
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break;
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case xfa::XFA_BaseNode::LAYOUT::Rl_tb:
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break;
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case xfa::XFA_BaseNode::LAYOUT::Row:
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break;
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case xfa::XFA_BaseNode::LAYOUT::Table:
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break;
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case xfa::XFA_BaseNode::LAYOUT::Tb:
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{
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// Top-to-bottom layout
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Layout finalLayout;
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finalLayout.pageIndex = pageIndex;
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PDFReal x = 0.0;
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PDFReal y = 0.0;
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PDFReal maxW = 0.0;
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for (Layout& layout : layouts)
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{
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layout.translate(x, y);
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finalLayout.items.insert(finalLayout.items.end(), layout.items.begin(), layout.items.end());
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y += layout.nominalExtent.height();
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maxW = qMax(maxW, layout.nominalExtent.width());
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}
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// Translate by margin
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finalLayout.translate(currentLayoutParameters.margins.left(), currentLayoutParameters.margins.top());
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QSizeF nominalContentSize(maxW, y);
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QSizeF nominalExtentSize = nominalContentSize.grownBy(currentLayoutParameters.margins);
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nominalExtentSize = currentLayoutParameters.sizeInfo.adjustNominalExtentSize(nominalExtentSize);
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QRectF nominalExtentRegion(QPointF(0, 0), nominalExtentSize);
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finalLayout.nominalExtent = nominalExtentRegion;
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if (!finalLayout.items.empty())
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{
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currentLayoutParameters.layout.emplace_back(std::move(finalLayout));
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}
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break;
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}
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default:
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Q_ASSERT(false);
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break;
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}
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}
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}
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void PDFXFALayoutEngine::visit(const xfa::XFA_draw* node)
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@ -9849,23 +10050,16 @@ void PDFXFALayoutEngine::visit(const xfa::XFA_draw* node)
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break;
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}
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QSizeF size = getSizeFromMeasurement(node->getW(), node->getH());
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QSizeF minSize = getSizeFromMeasurement(node->getMinW(), node->getMinH());
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QSizeF maxSize = getSizeFromMeasurement(node->getMaxW(), node->getMaxH());
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SizeInfo sizeInfo = getSizeInfo(node);
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if (size.isNull())
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{
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size = minSize;
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}
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if (size.isNull())
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if (sizeInfo.effSize.isNull())
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{
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// Empty draw, do nothing
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return;
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}
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QPointF point = getPointFromMeasurement(node->getX(), node->getY());
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QRectF nominalExtent(QPoint(0, 0), size);
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QRectF nominalExtent(QPoint(0, 0), sizeInfo.effSize);
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LayoutParametersStackGuard guard(this);
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LayoutParameters& parameters = getLayoutParameters();
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@ -9873,9 +10067,7 @@ void PDFXFALayoutEngine::visit(const xfa::XFA_draw* node)
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parameters.yOffset = point.y();
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parameters.anchorType = node->getAnchorType();
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parameters.presence = node->getPresence();
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parameters.size = size;
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parameters.minSize = minSize;
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parameters.maxSize = maxSize;
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parameters.sizeInfo = sizeInfo;
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Layout layout = initializeSingleLayout(nominalExtent);
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layout.items.back().presence = node->getPresence();
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@ -9886,6 +10078,80 @@ void PDFXFALayoutEngine::visit(const xfa::XFA_draw* node)
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void PDFXFALayoutEngine::visit(const xfa::XFA_field* node)
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{
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switch (node->getPresence())
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{
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case xfa::XFA_BaseNode::PRESENCE::Visible:
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break;
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case xfa::XFA_BaseNode::PRESENCE::Hidden:
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case xfa::XFA_BaseNode::PRESENCE::Inactive:
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return;
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case xfa::XFA_BaseNode::PRESENCE::Invisible:
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break;
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}
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SizeInfo sizeInfo = getSizeInfo(node);
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if (sizeInfo.effSize.isNull())
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{
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// Empty draw, do nothing
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return;
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}
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QPointF point = getPointFromMeasurement(node->getX(), node->getY());
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QRectF nominalExtent(QPoint(0, 0), sizeInfo.effSize);
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LayoutParametersStackGuard guard(this);
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LayoutParameters& parameters = getLayoutParameters();
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parameters.xOffset = point.x();
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parameters.yOffset = point.y();
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parameters.anchorType = node->getAnchorType();
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parameters.presence = node->getPresence();
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parameters.sizeInfo = sizeInfo;
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Layout layout = initializeSingleLayout(nominalExtent);
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layout.items.back().presence = node->getPresence();
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layout.items.back().field = node;
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parameters.layout.emplace_back(std::move(layout));
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}
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void PDFXFALayoutEngine::performLayout(PDFXFAEngineImpl* engine, const xfa::XFA_template* node)
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{
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node->accept(this);
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std::map<PDFInteger, std::vector<Layout>> layoutPerPage;
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for (Layout& layout : m_layout)
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{
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layoutPerPage[layout.pageIndex].emplace_back(std::move(layout));
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}
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PDFInteger pageIndex = 0;
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for (const auto& layoutSinglePage : layoutPerPage)
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{
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PDFXFAEngineImpl::LayoutItems layoutItems;
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for (const Layout& layout : layoutSinglePage.second)
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{
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for (const LayoutItem& layoutItem : layout.items)
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{
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// Invisible item?
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if (layoutItem.presence != xfa::XFA_BaseNode::PRESENCE::Visible)
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{
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continue;
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}
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PDFXFAEngineImpl::LayoutItem engineLayoutItem;
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engineLayoutItem.nominalExtent = layoutItem.nominalExtent;
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engineLayoutItem.draw = layoutItem.draw;
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engineLayoutItem.field = layoutItem.field;
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layoutItems.emplace_back(std::move(engineLayoutItem));
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}
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}
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engine->setLayoutItems(pageIndex++, std::move(layoutItems));
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}
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}
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void PDFXFALayoutEngine::visit(const xfa::XFA_pageArea* node)
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@ -10027,7 +10293,16 @@ void PDFXFALayoutEngine::visit(const xfa::XFA_subform* node)
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}
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LayoutParametersStackGuard guard(this);
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getLayoutParameters().presence = node->getPresence();
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SizeInfo sizeInfo = getSizeInfo(node);
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QPointF point = getPointFromMeasurement(node->getX(), node->getY());
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LayoutParameters& parameters = getLayoutParameters();
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parameters.xOffset = point.x();
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parameters.yOffset = point.y();
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parameters.anchorType = node->getAnchorType();
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parameters.presence = node->getPresence();
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parameters.sizeInfo = sizeInfo;
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// Handle break before
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handleBreak(node->getBreak(), true);
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@ -10462,7 +10737,7 @@ void PDFXFAEngineImpl::setDocument(const PDFModifiedDocument& document, PDFForm*
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if (m_template.hasValue())
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{
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PDFXFALayoutEngine layoutEngine;
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m_template.getValue()->accept(&layoutEngine);
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layoutEngine.performLayout(this, m_template.getValue());
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}
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}
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}
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@ -10472,6 +10747,66 @@ void PDFXFAEngineImpl::clear()
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{
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// Clear the template
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m_template = xfa::XFA_Node<xfa::XFA_template>();
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m_layout = Layout();
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}
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template<typename Node>
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PDFXFALayoutEngine::SizeInfo PDFXFALayoutEngine::getSizeInfo(const Node* node) const
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{
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SizeInfo info;
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info.origSize = getSizeFromMeasurement(node->getW(), node->getH());
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info.minSize = getSizeFromMeasurement(node->getMinW(), node->getMinH());
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info.maxSize = getSizeFromMeasurement(node->getMaxW(), node->getMaxH());
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info.effSize = info.origSize;
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info.effSize.setWidth(qMax(info.effSize.width(), info.minSize.width()));
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info.effSize.setHeight(qMax(info.effSize.height(), info.minSize.height()));
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if (!qFuzzyIsNull(info.maxSize.width()))
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{
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info.effSize.setWidth(qMin(info.effSize.width(), info.maxSize.width()));
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}
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if (!qFuzzyIsNull(info.maxSize.height()))
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{
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info.effSize.setHeight(qMin(info.effSize.height(), info.maxSize.height()));
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}
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return info;
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}
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QSizeF PDFXFALayoutEngine::SizeInfo::adjustNominalExtentSize(const QSizeF size)
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{
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PDFReal minW = origSize.width();
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PDFReal minH = origSize.height();
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|
||||
if (qFuzzyIsNull(minW))
|
||||
{
|
||||
minW = minSize.width();
|
||||
}
|
||||
|
||||
if (qFuzzyIsNull(minH))
|
||||
{
|
||||
minH = minSize.height();
|
||||
}
|
||||
|
||||
PDFReal maxW = origSize.width();
|
||||
PDFReal maxH = origSize.height();
|
||||
|
||||
if (qFuzzyIsNull(maxW))
|
||||
{
|
||||
maxW = maxSize.width();
|
||||
}
|
||||
|
||||
if (qFuzzyIsNull(maxH))
|
||||
{
|
||||
maxH = maxSize.height();
|
||||
}
|
||||
|
||||
PDFReal correctedWidth = qBound(minW, size.width(), maxW);
|
||||
PDFReal correctedHeight = qBound(minH, size.height(), maxH);
|
||||
|
||||
return QSizeF(correctedWidth, correctedHeight);
|
||||
}
|
||||
|
||||
} // namespace pdf
|
||||
|
|
|
|||
Loading…
Reference in New Issue