QGIS API Documentation  2.18.21-Las Palmas (9fba24a)
Public Member Functions | Protected Slots | Protected Member Functions | Static Protected Member Functions | List of all members
QgsMapRendererCustomPainterJob Class Reference

Job implementation that renders everything sequentially using a custom painter. More...

#include <qgsmaprenderercustompainterjob.h>

Inheritance diagram for QgsMapRendererCustomPainterJob:
Inheritance graph
[legend]

Public Member Functions

 QgsMapRendererCustomPainterJob (const QgsMapSettings &settings, QPainter *painter)
 
 ~QgsMapRendererCustomPainterJob ()
 
virtual void cancel () override
 Stop the rendering job - does not return until the job has terminated. More...
 
virtual void cancelWithoutBlocking () override
 Triggers cancellation of the rendering job without blocking. More...
 
virtual bool isActive () const override
 Tell whether the rendering job is currently running in background. More...
 
const LayerRenderJobsjobs () const
 
void renderSynchronously ()
 Render the map synchronously in this thread. More...
 
virtual void start () override
 Start the rendering job and immediately return. More...
 
virtual QgsLabelingResultstakeLabelingResults () override
 Get pointer to internal labeling engine (in order to get access to the results) More...
 
virtual void waitForFinished () override
 Block until the job has finished. More...
 
void waitForFinishedWithEventLoop (const QEventLoop::ProcessEventsFlags &flags=QEventLoop::AllEvents)
 Wait for the job to be finished - and keep the thread's event loop running while waiting. More...
 
- Public Member Functions inherited from QgsMapRendererJob
 QgsMapRendererJob (const QgsMapSettings &settings)
 
virtual ~QgsMapRendererJob ()
 
Errors errors () const
 List of errors that happened during the rendering job - available when the rendering has been finished. More...
 
const QgsMapSettingsmapSettings () const
 Return map settings with which this job was started. More...
 
int renderingTime () const
 Find out how log it took to finish the job (in miliseconds) More...
 
void setCache (QgsMapRendererCache *cache)
 Assign a cache to be used for reading and storing rendered images of individual layers. More...
 
void setRequestedGeometryCacheForLayers (const QStringList &layerIds)
 Set which vector layers should be cached while rendering. More...
 
- Public Member Functions inherited from QObject
 QObject (QObject *parent)
 
 QObject (QObject *parent, const char *name)
 
virtual ~QObject ()
 
bool blockSignals (bool block)
 
QObjectchild (const char *objName, const char *inheritsClass, bool recursiveSearch) const
 
const QObjectList & children () const
 
const char * className () const
 
bool connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const
 
void deleteLater ()
 
void destroyed (QObject *obj)
 
bool disconnect (const QObject *receiver, const char *method)
 
bool disconnect (const char *signal, const QObject *receiver, const char *method)
 
void dumpObjectInfo ()
 
void dumpObjectTree ()
 
QList< QByteArraydynamicPropertyNames () const
 
virtual bool event (QEvent *e)
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 
findChild (const QString &name) const
 
QList< T > findChildren (const QRegExp &regExp) const
 
QList< T > findChildren (const QString &name) const
 
bool inherits (const char *className) const
 
void insertChild (QObject *object)
 
void installEventFilter (QObject *filterObj)
 
bool isA (const char *className) const
 
bool isWidgetType () const
 
void killTimer (int id)
 
virtual const QMetaObjectmetaObject () const
 
void moveToThread (QThread *targetThread)
 
const char * name () const
 
const char * name (const char *defaultName) const
 
QString objectName () const
 
QObjectparent () const
 
QVariant property (const char *name) const
 
void removeChild (QObject *object)
 
void removeEventFilter (QObject *obj)
 
void setName (const char *name)
 
void setObjectName (const QString &name)
 
void setParent (QObject *parent)
 
bool setProperty (const char *name, const QVariant &value)
 
bool signalsBlocked () const
 
int startTimer (int interval)
 
QThreadthread () const
 

Protected Slots

void futureFinished ()
 

Protected Member Functions

void doRender ()
 
- Protected Member Functions inherited from QgsMapRendererJob
void cleanupJobs (LayerRenderJobs &jobs)
 
void logRenderingTime (const LayerRenderJobs &jobs)
 
bool needTemporaryImage (QgsMapLayer *ml)
 
LayerRenderJobs prepareJobs (QPainter *painter, QgsPalLabeling *labelingEngine, QgsLabelingEngineV2 *labelingEngine2)
 
void updateLayerGeometryCaches ()
 called when rendering has finished to update all layers' geometry caches More...
 
- Protected Member Functions inherited from QObject
bool checkConnectArgs (const char *signal, const QObject *object, const char *method)
 
virtual void childEvent (QChildEvent *event)
 
virtual void connectNotify (const char *signal)
 
virtual void customEvent (QEvent *event)
 
virtual void disconnectNotify (const char *signal)
 
int receivers (const char *signal) const
 
QObjectsender () const
 
int senderSignalIndex () const
 
virtual void timerEvent (QTimerEvent *event)
 

Static Protected Member Functions

static void staticRender (QgsMapRendererCustomPainterJob *self)
 
- Static Protected Member Functions inherited from QgsMapRendererJob
static QImage composeImage (const QgsMapSettings &settings, const LayerRenderJobs &jobs)
 
static void drawLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext, QgsPalLabeling *labelingEngine, QgsLabelingEngineV2 *labelingEngine2, QPainter *painter)
 
static void drawNewLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext, QgsPalLabeling *labelingEngine)
 
static void drawOldLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext)
 
static bool reprojectToLayerExtent (const QgsMapLayer *ml, const QgsCoordinateTransform *ct, QgsRectangle &extent, QgsRectangle &r2)
 Convenience function to project an extent into the layer source CRS, but also split it into two extents if it crosses the +/- 180 degree line. More...
 
- Static Protected Member Functions inherited from QObject
QByteArray normalizeSignalSlot (const char *signalSlot)
 

Additional Inherited Members

- Public Types inherited from QgsMapRendererJob
typedef QList< ErrorErrors
 
- Signals inherited from QgsMapRendererJob
void finished ()
 emitted when asynchronous rendering is finished (or canceled). More...
 
- Static Public Member Functions inherited from QObject
bool connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
 
bool connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
 
bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
 
bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
 
QString tr (const char *sourceText, const char *disambiguation, int n)
 
QString trUtf8 (const char *sourceText, const char *disambiguation, int n)
 
- Protected Attributes inherited from QgsMapRendererJob
QgsMapRendererCachemCache
 
Errors mErrors
 
QMap< QString, QgsGeometryCachemGeometryCaches
 map of geometry caches More...
 
QTime mRenderingStart
 
int mRenderingTime
 
QStringList mRequestedGeomCacheForLayers
 list of layer IDs for which the geometry cache should be updated More...
 
QgsMapSettings mSettings
 
- Properties inherited from QObject
 objectName
 

Detailed Description

Job implementation that renders everything sequentially using a custom painter.

Also supports synchronous rendering in main thread for cases when rendering in background is not an option because of some technical limitations (e.g. printing to printer on some platforms).

Note
added in 2.4

Definition at line 32 of file qgsmaprenderercustompainterjob.h.

Constructor & Destructor Documentation

◆ QgsMapRendererCustomPainterJob()

QgsMapRendererCustomPainterJob::QgsMapRendererCustomPainterJob ( const QgsMapSettings settings,
QPainter painter 
)

Definition at line 29 of file qgsmaprenderercustompainterjob.cpp.

◆ ~QgsMapRendererCustomPainterJob()

QgsMapRendererCustomPainterJob::~QgsMapRendererCustomPainterJob ( )

Definition at line 40 of file qgsmaprenderercustompainterjob.cpp.

Member Function Documentation

◆ cancel()

void QgsMapRendererCustomPainterJob::cancel ( )
overridevirtual

Stop the rendering job - does not return until the job has terminated.

Does nothing if the rendering is not active.

Implements QgsMapRendererJob.

Definition at line 119 of file qgsmaprenderercustompainterjob.cpp.

◆ cancelWithoutBlocking()

void QgsMapRendererCustomPainterJob::cancelWithoutBlocking ( )
overridevirtual

Triggers cancellation of the rendering job without blocking.

The render job will continue to operate until it is able to cancel, at which stage the finished() signal will be emitted. Does nothing if the rendering is not active.

Implements QgsMapRendererJob.

Definition at line 143 of file qgsmaprenderercustompainterjob.cpp.

◆ doRender()

void QgsMapRendererCustomPainterJob::doRender ( )
protected

Definition at line 248 of file qgsmaprenderercustompainterjob.cpp.

◆ futureFinished

void QgsMapRendererCustomPainterJob::futureFinished ( )
protectedslot

Definition at line 211 of file qgsmaprenderercustompainterjob.cpp.

◆ isActive()

bool QgsMapRendererCustomPainterJob::isActive ( ) const
overridevirtual

Tell whether the rendering job is currently running in background.

Implements QgsMapRendererJob.

Definition at line 177 of file qgsmaprenderercustompainterjob.cpp.

◆ jobs()

const LayerRenderJobs& QgsMapRendererCustomPainterJob::jobs ( ) const
inline
Note
not available in python bindings

Definition at line 47 of file qgsmaprenderercustompainterjob.h.

◆ renderSynchronously()

void QgsMapRendererCustomPainterJob::renderSynchronously ( )

Render the map synchronously in this thread.

The function does not return until the map is completely rendered.

This is an alternative to ordinary API (using start() + waiting for finished() signal). Users are discouraged to use this method unless they have a strong reason for doing it. The synchronous rendering blocks the main thread, making the application unresponsive. Also, it is not possible to cancel rendering while it is in progress.

Definition at line 202 of file qgsmaprenderercustompainterjob.cpp.

◆ start()

void QgsMapRendererCustomPainterJob::start ( )
overridevirtual

Start the rendering job and immediately return.

Does nothing if the rendering is already in progress.

Implements QgsMapRendererJob.

Definition at line 53 of file qgsmaprenderercustompainterjob.cpp.

◆ staticRender()

void QgsMapRendererCustomPainterJob::staticRender ( QgsMapRendererCustomPainterJob self)
staticprotected

Definition at line 226 of file qgsmaprenderercustompainterjob.cpp.

◆ takeLabelingResults()

QgsLabelingResults * QgsMapRendererCustomPainterJob::takeLabelingResults ( )
overridevirtual

Get pointer to internal labeling engine (in order to get access to the results)

Implements QgsMapRendererJob.

Definition at line 183 of file qgsmaprenderercustompainterjob.cpp.

◆ waitForFinished()

void QgsMapRendererCustomPainterJob::waitForFinished ( )
overridevirtual

Block until the job has finished.

Implements QgsMapRendererJob.

Definition at line 160 of file qgsmaprenderercustompainterjob.cpp.

◆ waitForFinishedWithEventLoop()

void QgsMapRendererCustomPainterJob::waitForFinishedWithEventLoop ( const QEventLoop::ProcessEventsFlags flags = QEventLoop::AllEvents)

Wait for the job to be finished - and keep the thread's event loop running while waiting.

With a call to waitForFinished(), the waiting is done with a synchronization primitive and does not involve processing of messages. That may cause issues to code which requires some events to be handled in the main thread. Some plugins hooking into the rendering pipeline may require this in order to work properly - for example, OpenLayers plugin which uses a QWebPage in the main thread.

Ideally the "wait for finished" method should not be used at all. The code triggering rendering should not need to actively wait for rendering to finish.

Definition at line 194 of file qgsmaprenderercustompainterjob.cpp.


The documentation for this class was generated from the following files: