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qgslayout.h
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qgslayout.h
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/***************************************************************************
qgslayout.h
-------------------
begin : June 2017
copyright : (C) 2017 by Nyall Dawson
email : nyall dot dawson at gmail dot com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSLAYOUT_H
#define QGSLAYOUT_H
#include "qgis_core.h"
#include <QGraphicsScene>
#include "qgslayoutsnapper.h"
#include "qgsexpressioncontextgenerator.h"
#include "qgslayoutgridsettings.h"
#include "qgslayoutguidecollection.h"
#include "qgslayoutexporter.h"
class QgsLayoutItemMap;
class QgsLayoutModel;
class QgsLayoutMultiFrame;
class QgsLayoutPageCollection;
class QgsLayoutUndoStack;
class QgsLayoutRenderContext;
class QgsLayoutReportContext;
/**
* \ingroup core
* \class QgsLayout
* \brief Base class for layouts, which can contain items such as maps, labels, scalebars, etc.
*
* While the raw QGraphicsScene API can be used to render the contents of a QgsLayout
* to a QPainter, it is recommended to instead use a QgsLayoutExporter to handle rendering
* layouts instead. QgsLayoutExporter automatically takes care of the intracacies of
* preparing the layout and paint devices for correct exports, respecting various
* user settings such as the layout context DPI.
*
* \since QGIS 3.0
*/
class CORE_EXPORT QgsLayout : public QGraphicsScene, public QgsExpressionContextGenerator, public QgsLayoutUndoObjectInterface
{
Q_OBJECT
Q_PROPERTY( QString name READ name WRITE setName NOTIFY nameChanged )
public:
//! Preset item z-values, to ensure correct stacking
enum ZValues
{
ZPage = 0, //!< Z-value for page (paper) items
ZItem = 1, //!< Minimum z value for items
ZGrid = 9997, //!< Z-value for page grids
ZGuide = 9998, //!< Z-value for page guides
ZSmartGuide = 9999, //!< Z-value for smart (item bounds based) guides
ZMouseHandles = 10000, //!< Z-value for mouse handles
ZViewTool = 10001, //!< Z-value for temporary view tool items
ZSnapIndicator = 10002, //!< Z-value for snapping indicator
};
//! Layout undo commands, used for collapsing undo commands
enum UndoCommand
{
UndoLayoutDpi, //!< Change layout default DPI
UndoNone = -1, //!< No command suppression
};
/**
* Construct a new layout linked to the specified \a project.
*
* If the layout is a "new" layout (as opposed to a layout which will
* restore a previous state from XML) then initializeDefaults() should be
* called on the new layout.
*/
QgsLayout( QgsProject *project );
~QgsLayout() override;
/**
* Creates a clone of the layout. Ownership of the return layout
* is transferred to the caller.
*/
virtual QgsLayout *clone() const SIP_FACTORY;
/**
* Initializes an empty layout, e.g. by adding a default page to the layout. This should be called after creating
* a new layout.
*/
void initializeDefaults();
/**
* Clears the layout.
*
* Calling this method removes all items and pages from the layout.
*/
void clear();
/**
* The project associated with the layout. Used to get access to layers, map themes,
* relations and various other bits. It is never null.
*
*/
QgsProject *project() const;
/**
* Returns the items model attached to the layout.
*/
QgsLayoutModel *itemsModel();
/**
* Returns the layout's name.
* \see setName()
*/
QString name() const { return mName; }
/**
* Sets the layout's name.
* \see name()
*/
void setName( const QString &name );
/**
* Returns a list of layout items of a specific type.
* \note not available in Python bindings
*/
template<class T> void layoutItems( QList<T *> &itemList ) const SIP_SKIP
{
itemList.clear();
QList<QGraphicsItem *> graphicsItemList = items();
QList<QGraphicsItem *>::iterator itemIt = graphicsItemList.begin();
for ( ; itemIt != graphicsItemList.end(); ++itemIt )
{
T *item = dynamic_cast<T *>( *itemIt );
if ( item )
{
itemList.push_back( item );
}
}
}
/**
* Returns list of selected layout items.
*
* If \a includeLockedItems is set to true, then locked items will also be included
* in the returned list.
*/
QList<QgsLayoutItem *> selectedLayoutItems( const bool includeLockedItems = true );
/**
* Clears any selected items and sets \a item as the current selection.
*/
void setSelectedItem( QgsLayoutItem *item );
/**
* Clears any selected items in the layout.
*
* Call this method rather than QGraphicsScene::clearSelection, as the latter does
* not correctly emit signals to allow the layout's model to update.
*/
void deselectAll();
/**
* Raises an \a item up the z-order.
* Returns true if the item was successfully raised.
*
* If \a deferUpdate is true, the scene will not be visibly updated
* to reflect the new stacking order. This allows multiple
* raiseItem() calls to be made in sequence without the cost of
* updating the scene for each one.
*
* \see lowerItem()
* \see updateZValues()
*/
bool raiseItem( QgsLayoutItem *item, bool deferUpdate = false );
/**
* Lowers an \a item down the z-order.
* Returns true if the item was successfully lowered.
*
* If \a deferUpdate is true, the scene will not be visibly updated
* to reflect the new stacking order. This allows multiple
* raiseItem() calls to be made in sequence without the cost of
* updating the scene for each one.
*
* \see raiseItem()
* \see updateZValues()
*/
bool lowerItem( QgsLayoutItem *item, bool deferUpdate = false );
/**
* Raises an \a item up to the top of the z-order.
* Returns true if the item was successfully raised.
*
* If \a deferUpdate is true, the scene will not be visibly updated
* to reflect the new stacking order. This allows multiple
* raiseItem() calls to be made in sequence without the cost of
* updating the scene for each one.
*
* \see moveItemToBottom()
* \see updateZValues()
*/
bool moveItemToTop( QgsLayoutItem *item, bool deferUpdate = false );
/**
* Lowers an \a item down to the bottom of the z-order.
* Returns true if the item was successfully lowered.
* If \a deferUpdate is true, the scene will not be visibly updated
* to reflect the new stacking order. This allows multiple
* raiseItem() calls to be made in sequence without the cost of
* updating the scene for each one.
*
* \see moveItemToTop()
* \see updateZValues()
*/
bool moveItemToBottom( QgsLayoutItem *item, bool deferUpdate = false );
/**
* Resets the z-values of items based on their position in the internal
* z order list. This should be called after any stacking changes
* which deferred z-order updates.
*/
void updateZValues( const bool addUndoCommands = true );
/**
* Returns the layout item with matching \a uuid unique identifier, or a nullptr
* if a matching item could not be found.
*
* If \a includeTemplateUuids is true, then item's QgsLayoutItem::templateUuid()
* will also be tested when trying to match the uuid.
*
* \see multiFrameByUuid()
* \see itemById()
*/
QgsLayoutItem *itemByUuid( const QString &uuid, bool includeTemplateUuids = false ) const;
/**
* Returns a layout item given its \a id.
* Since item IDs are not necessarely unique, this function returns the first matching
* item found.
* \see itemByUuid()
*/
QgsLayoutItem *itemById( const QString &id ) const;
/**
* Returns the layout multiframe with matching \a uuid unique identifier, or a nullptr
* if a matching multiframe could not be found.
* \see itemByUuid()
*/
QgsLayoutMultiFrame *multiFrameByUuid( const QString &uuid ) const;
/**
* Returns the topmost layout item at a specified \a position. Ignores paper items.
* If \a ignoreLocked is set to true any locked items will be ignored.
*/
QgsLayoutItem *layoutItemAt( QPointF position, const bool ignoreLocked = false ) const;
/**
* Returns the topmost composer item at a specified \a position which is below a specified \a item. Ignores paper items.
* If \a ignoreLocked is set to true any locked items will be ignored.
*/
QgsLayoutItem *layoutItemAt( QPointF position, const QgsLayoutItem *belowItem, const bool ignoreLocked = false ) const;
/**
* Sets the native measurement \a units for the layout. These also form the default unit
* for measurements for the layout.
* \see units()
* \see convertToLayoutUnits()
*/
void setUnits( QgsUnitTypes::LayoutUnit units ) { mUnits = units; }
/**
* Returns the native units for the layout.
* \see setUnits()
* \see convertToLayoutUnits()
*/
QgsUnitTypes::LayoutUnit units() const { return mUnits; }
/**
* Converts a measurement into the layout's native units.
* \returns length of measurement in layout units
* \see convertFromLayoutUnits()
* \see units()
*/
double convertToLayoutUnits( const QgsLayoutMeasurement &measurement ) const;
/**
* Converts a size into the layout's native units.
* \returns size of measurement in layout units
* \see convertFromLayoutUnits()
* \see units()
*/
QSizeF convertToLayoutUnits( const QgsLayoutSize &size ) const;
/**
* Converts a \a point into the layout's native units.
* \returns point in layout units
* \see convertFromLayoutUnits()
* \see units()
*/
QPointF convertToLayoutUnits( const QgsLayoutPoint &point ) const;
/**
* Converts a \a length measurement from the layout's native units to a specified target \a unit.
* \returns length of measurement in specified units
* \see convertToLayoutUnits()
* \see units()
*/
QgsLayoutMeasurement convertFromLayoutUnits( const double length, const QgsUnitTypes::LayoutUnit unit ) const;
/**
* Converts a \a size from the layout's native units to a specified target \a unit.
* \returns size of measurement in specified units
* \see convertToLayoutUnits()
* \see units()
*/
QgsLayoutSize convertFromLayoutUnits( const QSizeF &size, const QgsUnitTypes::LayoutUnit unit ) const;
/**
* Converts a \a point from the layout's native units to a specified target \a unit.
* \returns point in specified units
* \see convertToLayoutUnits()
* \see units()
*/
QgsLayoutPoint convertFromLayoutUnits( const QPointF &point, const QgsUnitTypes::LayoutUnit unit ) const;
/**
* Returns a reference to the layout's render context, which stores information relating to the
* current rendering settings for the layout.
*/
QgsLayoutRenderContext &renderContext();
/**
* Returns a reference to the layout's render context, which stores information relating to the
* current rendering settings for the layout.
*/
SIP_SKIP const QgsLayoutRenderContext &renderContext() const;
/**
* Returns a reference to the layout's report context, which stores information relating to the
* current reporting context for the layout.
*/
QgsLayoutReportContext &reportContext();
/**
* Returns a reference to the layout's report context, which stores information relating to the
* current reporting context for the layout.
*/
SIP_SKIP const QgsLayoutReportContext &reportContext() const;
/**
* Returns a reference to the layout's snapper, which stores handles layout snap grids and lines
* and snapping points to the nearest matching point.
*/
QgsLayoutSnapper &snapper() { return mSnapper; }
/**
* Returns a reference to the layout's snapper, which stores handles layout snap grids and lines
* and snapping points to the nearest matching point.
*/
SIP_SKIP const QgsLayoutSnapper &snapper() const { return mSnapper; }
/**
* Returns a reference to the layout's grid settings, which stores settings relating
* to grid appearance, spacing and offsets.
*/
QgsLayoutGridSettings &gridSettings() { return mGridSettings; }
/**
* Returns a reference to the layout's grid settings, which stores settings relating
* to grid appearance, spacing and offsets.
*/
SIP_SKIP const QgsLayoutGridSettings &gridSettings() const { return mGridSettings; }
/**
* Returns a reference to the layout's guide collection, which manages page snap guides.
*/
QgsLayoutGuideCollection &guides();
/**
* Returns a reference to the layout's guide collection, which manages page snap guides.
*/
SIP_SKIP const QgsLayoutGuideCollection &guides() const;
/**
* Creates an expression context relating to the layout's current state. The context includes
* scopes for global, project, layout and layout context properties.
*/
QgsExpressionContext createExpressionContext() const override;
/**
* Set a custom property for the layout.
* \param key property key. If a property with the same key already exists it will be overwritten.
* \param value property value
* \see customProperty()
* \see removeCustomProperty()
* \see customProperties()
*/
void setCustomProperty( const QString &key, const QVariant &value );
/**
* Read a custom property from the layout.
* \param key property key
* \param defaultValue default value to return if property with matching key does not exist
* \returns value of matching property
* \see setCustomProperty()
* \see removeCustomProperty()
* \see customProperties()
*/
QVariant customProperty( const QString &key, const QVariant &defaultValue = QVariant() ) const;
/**
* Remove a custom property from the layout.
* \param key property key
* \see setCustomProperty()
* \see customProperty()
* \see customProperties()
*/
void removeCustomProperty( const QString &key );
/**
* Return list of keys stored in custom properties for the layout.
* \see setCustomProperty()
* \see customProperty()
* \see removeCustomProperty()
*/
QStringList customProperties() const;
/**
* Returns the map item which will be used to generate corresponding world files when the
* layout is exported. If no map was explicitly set via setReferenceMap(), the largest
* map in the layout will be returned (or nullptr if there are no maps in the layout).
* \see setReferenceMap()
* \see generateWorldFile()
*/
QgsLayoutItemMap *referenceMap() const;
/**
* Sets the \a map item which will be used to generate corresponding world files when the
* layout is exported.
* \see referenceMap()
* \see setGenerateWorldFile()
*/
void setReferenceMap( QgsLayoutItemMap *map );
/**
* Returns a pointer to the layout's page collection, which stores and manages
* page items in the layout.
*/
QgsLayoutPageCollection *pageCollection();
/**
* Returns a pointer to the layout's page collection, which stores and manages
* page items in the layout.
*/
SIP_SKIP const QgsLayoutPageCollection *pageCollection() const;
/**
* Calculates the bounds of all non-gui items in the layout. Ignores snap lines, mouse handles
* and other cosmetic items.
* \param ignorePages set to true to ignore page items
* \param margin optional marginal (in percent, e.g., 0.05 = 5% ) to add around items
* \returns layout bounds, in layout units.
*
* \see pageItemBounds()
*/
QRectF layoutBounds( bool ignorePages = false, double margin = 0.0 ) const;
/**
* Returns the bounding box of the items contained on a specified \a page.
* A page number of 0 represents the first page in the layout.
*
* Set \a visibleOnly to true to only include visible items.
*
* The returned bounds are in layout units.
*
* \see layoutBounds()
*/
QRectF pageItemBounds( int page, bool visibleOnly = false ) const;
/**
* Adds an \a item to the layout. This should be called instead of the base class addItem()
* method. Ownership of the item is transferred to the layout.
*/
void addLayoutItem( QgsLayoutItem *item SIP_TRANSFER );
/**
* Removes an \a item from the layout. This should be called instead of the base class removeItem()
* method.
* The item will also be deleted.
*/
void removeLayoutItem( QgsLayoutItem *item );
/**
* Adds a \a multiFrame to the layout. The object is owned by the layout until removeMultiFrame() is called.
* \see removeMultiFrame()
* \see multiFrames()
*/
void addMultiFrame( QgsLayoutMultiFrame *multiFrame SIP_TRANSFER );
/**
* Removes a \a multiFrame from the layout (but does not delete it).
* \see addMultiFrame()
* \see multiFrames()
*/
void removeMultiFrame( QgsLayoutMultiFrame *multiFrame );
/**
* Returns a list of multi frames contained in the layout.
* \see addMultiFrame()
* \see removeMultiFrame()
*/
QList< QgsLayoutMultiFrame * > multiFrames() const;
/**
* Saves the layout as a template at the given file \a path.
* Returns true if save was successful.
* \see loadFromTemplate()
*/
bool saveAsTemplate( const QString &path, const QgsReadWriteContext &context ) const;
/**
* Load a layout template \a document.
*
* By default this method will clear all items from the existing layout and real all layout
* settings from the template. Setting \a clearExisting to false will only add new items
* from the template, without overwriting the existing items or layout settings.
*
* If \a ok is specified, it will be set to true if the load was successful.
*
* Returns a list of loaded items.
*/
QList< QgsLayoutItem * > loadFromTemplate( const QDomDocument &document, const QgsReadWriteContext &context, bool clearExisting = true, bool *ok SIP_OUT = nullptr );
/**
* Returns the layout's state encapsulated in a DOM element.
* \see readXml()
*/
virtual QDomElement writeXml( QDomDocument &document, const QgsReadWriteContext &context ) const;
/**
* Sets the collection's state from a DOM element. \a layoutElement is the DOM node corresponding to the layout.
* \see writeXml()
*/
virtual bool readXml( const QDomElement &layoutElement, const QDomDocument &document, const QgsReadWriteContext &context );
/**
* Add items from an XML representation to the layout. Used for project file reading and pasting items from clipboard.
*
* The \a position argument is optional, and if it is not specified the items will be restored to their
* original position from the XML serialization. If specified, the items will be positioned such that the top-left
* bounds of all added items is located at this \a position.
*
* The \a pasteInPlace argument determines whether the serialized position should be respected, but remapped to the
* origin of the page corresponding to the page at \a position.
*
* A list of the newly added items is returned.
*/
QList< QgsLayoutItem * > addItemsFromXml( const QDomElement &parentElement, const QDomDocument &document,
const QgsReadWriteContext &context,
QPointF *position = nullptr, bool pasteInPlace = false );
/**
* Returns a pointer to the layout's undo stack, which manages undo/redo states for the layout
* and it's associated objects.
*/
QgsLayoutUndoStack *undoStack();
/**
* Returns a pointer to the layout's undo stack, which manages undo/redo states for the layout
* and it's associated objects.
*/
SIP_SKIP const QgsLayoutUndoStack *undoStack() const;
QgsAbstractLayoutUndoCommand *createCommand( const QString &text, int id = 0, QUndoCommand *parent = nullptr ) SIP_FACTORY override;
/**
* Creates a new group from a list of layout \a items and adds the group to the layout.
* If grouping was not possible, a nullptr will be returned.
* \see ungroupItems()
*/
QgsLayoutItemGroup *groupItems( const QList<QgsLayoutItem *> &items );
/**
* Ungroups items by removing them from an item \a group and removing the group from the
* layout. Child items will remain in the layout and will not be deleted.
*
* Returns a list of the items removed from the group, or an empty list if ungrouping
* was not successful.
*
* \see groupItems()
*/
QList<QgsLayoutItem *> ungroupItems( QgsLayoutItemGroup *group );
public slots:
/**
* Forces the layout, and all items contained within it, to refresh. For instance, this causes maps to redraw
* and rebuild cached images, html items to reload their source url, and attribute tables
* to refresh their contents. Calling this also triggers a recalculation of all data defined
* attributes within the layout.
*
* \see refreshed()
*/
void refresh();
/**
* Updates the scene bounds of the layout.
*/
void updateBounds();
signals:
/**
* Is emitted when properties of the layout change. This signal is only
* emitted for settings directly managed by the layout, and is not emitted
* when child items change.
*/
void changed();
/**
* Emitted whenever the expression variables stored in the layout have been changed.
*/
void variablesChanged();
/**
* Emitted whenever the selected item changes.
* If nullptr, no item is selected.
*/
void selectedItemChanged( QgsLayoutItem *selected );
/**
* Is emitted when the layout has been refreshed and items should also be refreshed
* and updated.
*/
void refreshed();
/**
* Emitted when the layout's name is changed.
* \see setName()
*/
void nameChanged( const QString &name );
private:
QgsProject *mProject = nullptr;
std::unique_ptr< QgsLayoutModel > mItemsModel;
QString mName;
QgsObjectCustomProperties mCustomProperties;
QgsUnitTypes::LayoutUnit mUnits = QgsUnitTypes::LayoutMillimeters;
QgsLayoutRenderContext *mRenderContext = nullptr;
QgsLayoutReportContext *mReportContext = nullptr;
QgsLayoutSnapper mSnapper;
QgsLayoutGridSettings mGridSettings;
std::unique_ptr< QgsLayoutPageCollection > mPageCollection;
std::unique_ptr< QgsLayoutUndoStack > mUndoStack;
//! List of multiframe objects
QList<QgsLayoutMultiFrame *> mMultiFrames;
//! Item ID for composer map to use for the world file generation
QString mWorldFileMapId;
//! Writes only the layout settings (not member settings like grid settings, etc) to XML
void writeXmlLayoutSettings( QDomElement &element, QDomDocument &document, const QgsReadWriteContext &context ) const;
//! Reads only the layout settings (not member settings like grid settings, etc) from XML
bool readXmlLayoutSettings( const QDomElement &layoutElement, const QDomDocument &document, const QgsReadWriteContext &context );
/**
* Adds a layout item to the layout, without adding the corresponding undo commands.
*/
void addLayoutItemPrivate( QgsLayoutItem *item );
/**
* Removes an item from the layout, without adding the corresponding undo commands.
*/
void removeLayoutItemPrivate( QgsLayoutItem *item );
void deleteAndRemoveMultiFrames();
//! Calculates the item minimum position from an XML element
QPointF minPointFromXml( const QDomElement &elem ) const;
friend class QgsLayoutItemAddItemCommand;
friend class QgsLayoutItemDeleteUndoCommand;
friend class QgsLayoutItemUndoCommand;
friend class QgsLayoutUndoCommand;
friend class QgsLayoutItemGroupUndoCommand;
friend class QgsLayoutModel;
friend class QgsLayoutMultiFrame;
};
#endif //QGSLAYOUT_H