FMH::FileLoader Class Reference

#include <fileloader.h>

Inheritance diagram for FMH::FileLoader:

Signals
void	finished (FMH::MODEL_LIST items, QList< QUrl > urls)
void	itemReady (FMH::MODEL item, QList< QUrl > urls)
void	itemsReady (FMH::MODEL_LIST items, QList< QUrl > urls)

Public Member Functions
	FileLoader (QObject *parent=nullptr)
uint	batchCount () const
void	requestPath (const QList< QUrl > &urls, const bool &recursive, const QStringList &nameFilters={}, const QDir::Filters &filters=QDir::Files, const uint &limit=99999)
void	setBatchCount (const uint &count)
Public Member Functions inherited from QObject
	QObject (QObject *parent)
QBindable< QString >	bindableObjectName ()
bool	blockSignals (bool block)
const QObjectList &	children () const const
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
void	deleteLater ()
void	destroyed (QObject *obj)
bool	disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool	disconnect (const QObject *receiver, const char *method) const const
void	dumpObjectInfo () const const
void	dumpObjectTree () const const
QList< QByteArray >	dynamicPropertyNames () const const
virtual bool	event (QEvent *e)
virtual bool	eventFilter (QObject *watched, QEvent *event)
T	findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (Qt::FindChildOptions options) const const
bool	inherits (const char *className) const const
void	installEventFilter (QObject *filterObj)
bool	isQuickItemType () const const
bool	isWidgetType () const const
bool	isWindowType () const const
void	killTimer (int id)
virtual const QMetaObject *	metaObject () const const
void	moveToThread (QThread *targetThread)
QString	objectName () const const
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
QVariant	property (const char *name) const const
	Q_CLASSINFO (Name, Value)
	Q_EMIT Q_EMIT
	Q_ENUM (...)
	Q_ENUM_NS (...)
	Q_ENUMS (...)
	Q_FLAG (...)
	Q_FLAG_NS (...)
	Q_FLAGS (...)
	Q_GADGET Q_GADGET
	Q_GADGET_EXPORT (EXPORT_MACRO)
	Q_INTERFACES (...)
	Q_INVOKABLE Q_INVOKABLE
	Q_MOC_INCLUDE Q_MOC_INCLUDE
	Q_NAMESPACE Q_NAMESPACE
	Q_NAMESPACE_EXPORT (EXPORT_MACRO)
	Q_OBJECT Q_OBJECT
	Q_PROPERTY (...)
	Q_REVISION Q_REVISION
	Q_SET_OBJECT_NAME (Object)
	Q_SIGNAL Q_SIGNAL
	Q_SIGNALS Q_SIGNALS
	Q_SLOT Q_SLOT
	Q_SLOTS Q_SLOTS
T	qobject_cast (const QObject *object)
T	qobject_cast (QObject *object)
	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
void	removeEventFilter (QObject *obj)
void	setObjectName (const QString &name)
void	setObjectName (QAnyStringView name)
void	setParent (QObject *parent)
bool	setProperty (const char *name, const QVariant &value)
bool	setProperty (const char *name, QVariant &&value)
bool	signalsBlocked () const const
int	startTimer (int interval, Qt::TimerType timerType)
int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)
QThread *	thread () const const

Static Public Attributes
static std::function< FMH::MODEL(const QUrl &url)>	informer = &FMStatic::getFileInfoModel

Additional Inherited Members
Public Types inherited from QObject
typedef	QObjectList
Properties inherited from QObject
	objectName
Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
bool	disconnect (const QMetaObject::Connection &connection)
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)
bool	disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
QString	tr (const char *sourceText, const char *disambiguation, int n)
Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	customEvent (QEvent *event)
virtual void	disconnectNotify (const QMetaMethod &signal)
bool	isSignalConnected (const QMetaMethod &signal) const const
int	receivers (const char *signal) const const
QObject *	sender () const const
int	senderSignalIndex () const const
virtual void	timerEvent (QTimerEvent *event)

Detailed Description

The FileLoader class asynchronously loads batches of files from a given list of local directories or tags, allowing to filter them by name, mime-types, and much more.

The execution of the file listing will be moved into a different thread, - so to retrieve the information you will depend on the exposed signals and the informer callback function to give structure to the data.

See also

informer

The following code snippet demonstrates the usage, by listing all the content in the downloads and pictures local directories.

#include <QCoreApplication>
#include <QDebug>
#include <QUrl>
#include <QObject>
#include <iostream>
 
#include <MauiKit4/FileBrowsing/fileloader.h>
#include <MauiKit4/FileBrowsing/fmstatic.h>
 
int main(int argc, char *argv[])
{
   QCoreApplication a(argc, argv);
 
   FMH::FileLoader loader;
   QStringList urls = {FMStatic::DownloadsPath, FMStatic::PicturesPath};
 
   QObject::connect(&loader, &FMH::FileLoader::itemsReady, [=](FMH::MODEL_LIST items, QList<QUrl> urls) {
                        for(const auto &item : items)
                            qDebug() << item[FMH::MODEL_KEY::NAME];
 
                        qDebug() << "items ready for:" << urls << items.length(); });
 
   QObject::connect(&loader, &FMH::FileLoader::finished, [=](FMH::MODEL_LIST items, QList<QUrl> urls) {
         qDebug() << "Finished process" << urls << items.length(); });
 
   loader.setBatchCount(10);
   loader.requestPath(QUrl::fromStringList(urls), true);
 
   return a.exec();
}

Definition at line 75 of file fileloader.h.

Constructor & Destructor Documentation

FileLoader()

FileLoader::FileLoader

(

QObject *

parent = nullptr

)

Creates a new instance, the execution will be moved to a different thread.

Definition at line 12 of file fileloader.cpp.

~FileLoader()

FileLoader::~FileLoader

(

)

Definition at line 24 of file fileloader.cpp.

Member Function Documentation

batchCount()

uint FileLoader::batchCount

(

)

const

The amount of items which will be dispatched while iterating throughout all the given directories.

Definition at line 35 of file fileloader.cpp.

finished

void FMH::FileLoader::finished ( FMH::MODEL_LIST items, QList< QUrl > urls )

signal

Emitted once the operation has completely finished retrieving all the existing files or reached the limit number of requested files.

Parameters

items

all of the retrieved items. The items data model is created using the informer callback function.

See also

informer

Parameters

urls	the list of directories given for which the item were retrieved.

itemReady

void FMH::FileLoader::itemReady ( FMH::MODEL item, QList< QUrl > urls )

signal

Emitted for every single item that becomes available.

Parameters

item	the packaged item, formed by the informer callback function.
urls	the list of directories given for which the item were retrieved.

itemsReady

void FMH::FileLoader::itemsReady ( FMH::MODEL_LIST items, QList< QUrl > urls )

signal

Emitted when the batch of file items is ready.

See also

setBatchCount

Parameters

items	the packaged list of items, formed by the informer callback function.
urls	the list of directories given for which the item were retrieved.

requestPath()

void FileLoader::requestPath	(	const QList< QUrl > &	urls,
		const bool &	recursive,
		const QStringList &	nameFilters = {},
		const QDir::Filters &	filters = QDir::Files,
		const uint &	limit = 99999 )

Sends the request to start iterating throughout all the given location URLs, and with the given parameters.

Parameters

urls	the list of directories or locations to iterate. This operation only supports local directories and tags.
recursive	Whether the iteration should be done recursively and navigate sub-folder structures
nameFilters	a list of filtering strings, this can be used with regular expressions, for example *.jpg to only list files ending with the given suffix. Dy default this is set to an empty array, so nothing will be filtered.
filters	the possible QDir filters. By default this is set to QDir::Files.
limit	the limit of files to retrieve. By default this is is set to 99999.

Definition at line 40 of file fileloader.cpp.

setBatchCount()

void FileLoader::setBatchCount

(

const uint &

count

)

Set the amount of items to be dispatched via the itemReady signal.

This allows to dispatch item files which are ready and don't have to wait for the operation to finished completely, in case there are too many files to wait for.

See also

itemsReady

Parameters

count

the amount of items

Definition at line 30 of file fileloader.cpp.

Member Data Documentation

informer

std::function< FMH::MODEL(const QUrl &url)> FileLoader::informer = &FMStatic::getFileInfoModel

static

A callback function which structures the retrieved file URLs, with the required information.

This callback function will receive the file URL, and expects a FMH::MODEL to be formed and returned. By default this informer callback function is set to FMStatic::getFileInfoModel, which retrieves basic information about a file.

See also

FMStatic::getFileInfoModel

Parameters

url	the file URL retrieved

Returns

the formed data model based on the given file URL

Definition at line 116 of file fileloader.h.

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

• fileloader.h
• fileloader.cpp