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193 lines
9.1 KiB
C++
193 lines
9.1 KiB
C++
/*
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Copyright (c) 2008-2022 Jan W. Krieger (<jan@jkrieger.de>)
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with contributions from: Razi Alavizadeh
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This software is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License (LGPL) as published by
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the Free Software Foundation, either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License (LGPL) for more details.
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You should have received a copy of the GNU Lesser General Public License (LGPL)
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef JKQTMATHTEXTLISTNODE_H
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#define JKQTMATHTEXTLISTNODE_H
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#include "jkqtmathtext/jkqtmathtext_imexport.h"
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#include "jkqtmathtext/jkqtmathtexttools.h"
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#include "jkqtmathtext/nodes/jkqtmathtextnode.h"
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#include <QPainter>
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#include <QFontMetricsF>
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class JKQTMathText; // forward
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// JKQTMATHTEXT_LIB_EXPORT
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/** \brief subclass representing a list of nodes in the syntax tree, layed out horizontally
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* \ingroup jkqtmathtext_items
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*
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* \note This type of node also implements typesetting sub-/superscript above/below the previous node (if
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* JKQTMathTextNode::is() is \c true for that previus node. The drawing is done as defined in the
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* following image \image html jkqtmathtext_subsuper_with_limits.png
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*
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* \see JKQTMathTextVerticalListNode
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*/
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class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextHorizontalListNode: public JKQTMathTextMultiChildNode {
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public:
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explicit JKQTMathTextHorizontalListNode(JKQTMathText* parent);
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virtual ~JKQTMathTextHorizontalListNode() override;
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/** \copydoc JKQTMathTextNode::getTypeName() */
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virtual QString getTypeName() const override;
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/** \copydoc JKQTMathTextNode::draw() */
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virtual double draw(QPainter& painter, double x, double y, JKQTMathTextEnvironment currentEv, const JKQTMathTextNodeSize* prevNodeSize=nullptr) override;
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/** \copydoc JKQTMathTextNode::toHtml() */
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virtual bool toHtml(QString& html, JKQTMathTextEnvironment currentEv, JKQTMathTextEnvironment defaultEv) override;
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/** \brief add a child node */
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void addChild(JKQTMathTextNode* n);
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/** \copydoc JKQTMathTextMultiChildNode::getChildren() */
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virtual QList<JKQTMathTextNode*> getChildren() override;
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/** \copydoc JKQTMathTextMultiChildNode::childCount() */
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virtual int childCount() const override;
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/** \copydoc JKQTMathTextMultiChildNode::clearChildren() */
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virtual void clearChildren(bool deleteChildren=true) override;
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/** \copydoc JKQTMathTextMultiChildNode::getChild() */
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virtual JKQTMathTextNode* getChild(int i) override;
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/** \copydoc JKQTMathTextMultiChildNode::getChild() */
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virtual const JKQTMathTextNode* getChild(int i) const override;
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/** \copydoc JKQTMathTextMultiChildNode::getChild() */
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virtual JKQTMathTextNode* replaceChild(int i, JKQTMathTextNode* newChild) override;
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protected:
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/** \copydoc JKQTMathTextNode::getSizeInternal() */
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virtual void getSizeInternal(QPainter& painter, JKQTMathTextEnvironment currentEv, double& width, double& baselineHeight, double& overallHeight, double& strikeoutPos, const JKQTMathTextNodeSize* prevNodeSize=nullptr) override;
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QList<JKQTMathTextNode*> nodes;
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private:
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/** \brief internal implementation of clearChildren() that is non-virtual, so can be used in the destructor */
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void clearChildrenImpl(bool deleteChildren);
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};
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/** \brief subclass representing a list of nodes in the syntax tree, layed out vertically
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* \ingroup jkqtmathtext_items
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*
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* Each child can be thought of as a line, so this node represents a list of lines.
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* The layout of the lines can left-aligned, right-aligned or centered.
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*
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* \image html jkqtmathtext_verticallist.png
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*
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* \image html jkqtmathtext_verticalalignment.png
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*
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* \image html jkqtmathtext_horizontalalignment.png
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*
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* \see JKQTMathTextHorizontalListNode
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*/
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class JKQTMATHTEXT_LIB_EXPORT JKQTMathTextVerticalListNode: public JKQTMathTextMultiChildNode {
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public:
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/** \brief defines, how lines are beeing spaced by the node
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*
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* \image html jkqtmathtext_verticallist.png
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*/
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enum SpacingMode {
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SMDefault, /*!< space the lines with equilibrated spacing, i.e. the baselines are at least \c QFontMetricsF::lineSpacing()*JKQTMathTextVerticalListNode::lineSpacingFactor apart, but even more, if the height of the text bloxk is larger than the the font's ascent+descent */
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SMMinimal /*!< space the lines as tight as possible, i.e. each line is separated by \c QFontMetricsF::leading()*JKQTMathTextVerticalListNode::lineSpacingFactor from the next line. This is a s compact as possible */
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};
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/** \brief convert a SpacingMode to a String */
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static QString SpacingMode2String(SpacingMode mode);
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/** \brief convert a String to a SpacingMode */
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static SpacingMode String2SpacingMode(QString mode);
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explicit JKQTMathTextVerticalListNode(JKQTMathText* parent, JKQTMathTextHorizontalAlignment _alignment=MTHACentered, double _linespacingFactor=1.0, SpacingMode spacingMode_=SMDefault, JKQTMathTextVerticalOrientation _verticalOrientation=MTVOFirstLine);
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virtual ~JKQTMathTextVerticalListNode() override;
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/** \copydoc JKQTMathTextNode::getTypeName() */
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virtual QString getTypeName() const override;
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/** \copydoc JKQTMathTextNode::draw() */
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virtual double draw(QPainter& painter, double x, double y, JKQTMathTextEnvironment currentEv, const JKQTMathTextNodeSize* prevNodeSize=nullptr) override;
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/** \copydoc JKQTMathTextNode::toHtml() */
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virtual bool toHtml(QString& html, JKQTMathTextEnvironment currentEv, JKQTMathTextEnvironment defaultEv) override;
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/** \brief add a child node */
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void addChild(JKQTMathTextNode* n);
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/** \copydoc JKQTMathTextMultiChildNode::getChildren() */
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virtual QList<JKQTMathTextNode*> getChildren() override;
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/** \copydoc JKQTMathTextMultiChildNode::childCount() */
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virtual int childCount() const override;
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/** \copydoc JKQTMathTextMultiChildNode::clearChildren() */
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virtual void clearChildren(bool deleteChildren=true) override;
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/** \copydoc JKQTMathTextMultiChildNode::getChild() */
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virtual JKQTMathTextNode* getChild(int i) override;
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/** \copydoc JKQTMathTextMultiChildNode::getChild() */
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virtual const JKQTMathTextNode* getChild(int i) const override;
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/** \copydoc JKQTMathTextMultiChildNode::getChild() */
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virtual JKQTMathTextNode* replaceChild(int i, JKQTMathTextNode* newChild) override;
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/** \copydoc alignment */
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JKQTMathTextHorizontalAlignment getAlignment() const;
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/** \copydoc verticalOrientation */
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JKQTMathTextVerticalOrientation getVerticalOrientation() const;
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/** \copydoc lineSpacingFactor */
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double getLineSpacingFactor() const;
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/** \copydoc spacingMode */
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SpacingMode getSpacingMode() const;
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protected:
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/** \copydoc JKQTMathTextNode::getSizeInternal() */
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virtual void getSizeInternal(QPainter& painter, JKQTMathTextEnvironment currentEv, double& width, double& baselineHeight, double& overallHeight, double& strikeoutPos, const JKQTMathTextNodeSize* prevNodeSize=nullptr) override;
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/** \brief describes the layout of the whole node */
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struct LayoutInfo: public JKQTMathTextNodeSize {
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LayoutInfo();
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/** \brief drawing position for each line */
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QList<QPointF> X;
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};
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/** \brief calclates the layout of the whole block/node */
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LayoutInfo calcLayout(QPainter& painter, JKQTMathTextEnvironment currentEv) const;
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/** \brief list of child nodes, each representing one line */
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QList<JKQTMathTextNode*> nodes;
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/** \brief alignment scheme used to lay out all lines
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*
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* \image html jkqtmathtext_horizontalalignment.png
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*/
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JKQTMathTextHorizontalAlignment alignment;
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/** \brief spacing of the separate lines, as factor of the default line-spacing [Default: 1].
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*
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* This property can be used to move the lines closer together or farther apart.
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*
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* \image html jkqtmathtext_verticallist.png
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*/
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double lineSpacingFactor;
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/** \brief vertical orientation of the baseline of the whole block (with respect to the single lines)
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*
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* \image html jkqtmathtext_verticalorientation.png
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*/
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JKQTMathTextVerticalOrientation verticalOrientation;
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/** \brief defines how the layout algorithm (see calcLayout() ) lays out the single lines */
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SpacingMode spacingMode;
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private:
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/** \brief internal implementation of clearChildren() that is non-virtual, so can be used in the destructor */
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void clearChildrenImpl(bool deleteChildren);
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};
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#endif // JKQTMATHTEXTLISTNODE_H
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