Kwave::Drag Class Reference

#include <Drag.h>

Inheritance diagram for Kwave::Drag:

Collaboration diagram for Kwave::Drag:

Public Member Functions
	Drag (QWidget *dragSource=Q_NULLPTR)
virtual	~Drag ()
bool	encode (QWidget *widget, Kwave::MultiTrackReader &src, const Kwave::MetaDataList &meta_data)

Static Public Member Functions
static bool	canDecode (const QMimeData *data)
static sample_index_t	decode (QWidget *widget, const QMimeData *e, Kwave::SignalManager &sig, sample_index_t pos)

Detailed Description

Simple class for drag & drop of wav data.

Todo:

the current storage mechanism is straight-forward and stupid, it should be extended to use virtual memory

Definition at line 46 of file Drag.h.

Constructor & Destructor Documentation

Drag()

Kwave::Drag::Drag ( QWidget *  dragSource = Q_NULLPTR )

explicit

Constructor

See also

QDragObject

Definition at line 31 of file Drag.cpp.

    :QDrag(dragSource)
{
}

~Drag()

Kwave::Drag::~Drag ( )

virtual

Destructor

Definition at line 37 of file Drag.cpp.

{
}

Member Function Documentation

canDecode()

bool Kwave::Drag::canDecode ( const QMimeData *  data )

static

Returns true if the mime type of the given source can be decoded

Definition at line 42 of file Drag.cpp.

References Kwave::CodecManager::canDecode().

Referenced by Kwave::SignalView::dragMoveEvent(), Kwave::MainWidget::dropEvent(), and Kwave::SignalView::dropEvent().

{
    if (!data) return false;
    foreach (const QString &format, data->formats())
        if (Kwave::CodecManager::canDecode(format)) return true;
    return false;
}

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decode()

sample_index_t Kwave::Drag::decode ( QWidget *  widget, const QMimeData *  e, Kwave::SignalManager &  sig, sample_index_t  pos  )

static

Decodes the encoded byte data of the given mime source and initializes a MultiTrackReader.

Parameters

widget	the widget used for displaying error messages
e	mime source
sig	signal that receives the mime data
pos	position within the signal where to insert the data

Returns

number of decoded samples if successful, zero if failed

Definition at line 76 of file Drag.cpp.

References Kwave::MimeData::decode().

Referenced by Kwave::MainWidget::dropEvent(), and Kwave::SignalView::dropEvent().

{
    return Kwave::MimeData::decode(widget, e, sig, pos);
}

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encode()

bool Kwave::Drag::encode	(	QWidget *	widget,
		Kwave::MultiTrackReader &	src,
		const Kwave::MetaDataList &	meta_data
	)

Encodes wave data received from a MultiTrackReader into a byte array that is compatible with the format of a wav file.

Parameters

widget	the widget used for displaying error messages
src	source of the samples
meta_data	information about the signal, sample rate, resolution and other meta data

Returns

true if successful

Definition at line 51 of file Drag.cpp.

References Kwave::MimeData::encode(), and Kwave::MultiTrackSource< SOURCE, INITIALIZE >::tracks().

Referenced by Kwave::SelectionItem::startDragging().

{
    Q_ASSERT(src.tracks());
    if (!src.tracks()) return false;
    Q_ASSERT(src[0]);
    if (!src[0]) return false;

    // create a mime data container
    Kwave::MimeData *mime_data = new(std::nothrow) Kwave::MimeData;
    Q_ASSERT(mime_data);
    if (!mime_data) return false;

    // encode into the mime data
    if (!mime_data->encode(widget, src, meta_data)) {
        delete mime_data;
        return false;
    }

    // use it for the drag container
    setMimeData(mime_data);
    return true;
}

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

• libkwave/Drag.h
• libkwave/Drag.cpp