Kwave::SignalView::PositionWidget Class Reference

Inheritance diagram for Kwave::SignalView::PositionWidget:

Collaboration diagram for Kwave::SignalView::PositionWidget:

Public Member Functions
	PositionWidget (QWidget *parent)
virtual	~PositionWidget () Q_DECL_OVERRIDE
virtual void	setText (const QString &text, Qt::Alignment alignment)

Protected Member Functions
virtual void	paintEvent (QPaintEvent *) Q_DECL_OVERRIDE
virtual void	updateMask ()

Private Attributes
QLabel *	m_label
Qt::Alignment	m_alignment
int	m_radius
int	m_arrow_length
Qt::Alignment	m_last_alignment
QSize	m_last_size
QPolygon	m_polygon

Detailed Description

Definition at line 355 of file SignalView.h.

Constructor & Destructor Documentation

PositionWidget()

Kwave::SignalView::PositionWidget::PositionWidget ( QWidget *  parent )

explicit

Constructor

Definition at line 686 of file SignalView.cpp.

References m_label.

    :QWidget(parent), m_label(Q_NULLPTR), m_alignment(Q_NULLPTR),
     m_radius(10), m_arrow_length(30), m_last_alignment(Qt::AlignHCenter),
     m_last_size(QSize(0,0)), m_polygon()
{
    hide();

    m_label = new QLabel(this);
    Q_ASSERT(m_label);
    if (!m_label) return;

    m_label->setFrameStyle(QFrame::Panel | QFrame::Plain);
    m_label->setPalette(QToolTip::palette()); // use same colors as a QToolTip
    m_label->setFocusPolicy(Qt::NoFocus);
    m_label->setMouseTracking(true);
    m_label->setLineWidth(0);

    setPalette(QToolTip::palette()); // use same colors as a QToolTip
    setMouseTracking(false);
    setFocusPolicy(Qt::NoFocus);
    setAttribute(Qt::WA_TransparentForMouseEvents);
}

~PositionWidget()

Kwave::SignalView::PositionWidget::~PositionWidget ( )

virtual

Destructor

Definition at line 710 of file SignalView.cpp.

References m_label.

{
    if (m_label) delete m_label;
    m_label = Q_NULLPTR;
}

Member Function Documentation

paintEvent()

void Kwave::SignalView::PositionWidget::paintEvent ( QPaintEvent *  )

protectedvirtual

paint event: draws the text and the arrow

Definition at line 815 of file SignalView.cpp.

References background, and m_polygon.

{
    QPainter p(this);
    p.setBrush(palette().background().color());
    p.drawPolygon(m_polygon);
}

setText()

void Kwave::SignalView::PositionWidget::setText ( const QString &  text, Qt::Alignment  alignment  )

virtual

set a new label text and alignment

Parameters

text	the text of the label, can be multiline and rtf/html
alignment	the alignment of the label and the widget, can be Qt::AlignLeft, Qt::AlignRight or Qt::AlignHCenter

Definition at line 717 of file SignalView.cpp.

References m_alignment, m_arrow_length, m_label, m_radius, and updateMask().

Referenced by Kwave::SignalView::showPosition().

{
    if (!m_label) return;

    m_alignment = alignment;

    m_label->setText(text);
    m_label->setAlignment(m_alignment);
    m_label->resize(m_label->sizeHint());

    switch (m_alignment) {
        case Qt::AlignLeft:
            resize(m_arrow_length + m_radius + m_label->width() + m_radius,
                   m_radius + m_label->height() + m_radius);
            m_label->move(m_arrow_length + m_radius, m_radius);
            break;
        case Qt::AlignRight:
            resize(m_radius + m_label->width() + m_radius + m_arrow_length,
                   m_radius + m_label->height() + m_radius);
            m_label->move(m_radius, m_radius);
            break;
        case Qt::AlignHCenter:
            resize(m_radius + m_label->width() + m_radius,
                   m_arrow_length + m_radius + m_label->height() + m_radius);
            m_label->move(m_radius, m_arrow_length + m_radius);
            break;
        default:
            ;
    }

    updateMask();
}

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updateMask()

void Kwave::SignalView::PositionWidget::updateMask ( )

protectedvirtual

re-creates the mask and the polygon when size/alignment has changed

Definition at line 752 of file SignalView.cpp.

References m_alignment, m_arrow_length, m_last_alignment, m_last_size, and m_polygon.

Referenced by setText().

{
    // bail out if nothing has changed
    if ((size() == m_last_size) && (m_alignment == m_last_alignment))
        return;

    QPainter p;
    QBitmap bmp(size());
    bmp.fill(Qt::color0);
    p.begin(&bmp);

    QBrush brush(Qt::color1);
    p.setBrush(brush);
    p.setPen(Qt::color1);

    const int h = height();
    const int w = width();

    // re-create the polygon, depending on alignment
    switch (m_alignment) {
        case Qt::AlignLeft:
            m_polygon.setPoints(8,
                m_arrow_length, 0,
                w - 1, 0,
                w - 1, h - 1,
                m_arrow_length, h - 1,
                m_arrow_length, (2 * h) / 3,
                0, h / 2,
                m_arrow_length, h / 3,
                m_arrow_length, 0
            );
            break;
        case Qt::AlignRight:
            m_polygon.setPoints(8,
                0, 0,
                w - 1 - m_arrow_length, 0,
                w - 1 - m_arrow_length, h / 3,
                w - 1, h/2,
                w - 1 - m_arrow_length, (2 * h) / 3,
                w - 1 - m_arrow_length, h - 1,
                0, h - 1,
                0, 0
            );
            break;
        case Qt::AlignHCenter:
            break;
        default:
            ;
    }

    p.drawPolygon(m_polygon);
    p.end();

    // activate the new widget mask
    clearMask();
    setMask(bmp);

    // remember size/alignment for detecting changes
    m_last_alignment = m_alignment;
    m_last_size      = size();
}

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Member Data Documentation

m_alignment

Qt::Alignment Kwave::SignalView::PositionWidget::m_alignment

private

alignment of the label / text

Definition at line 389 of file SignalView.h.

Referenced by setText(), and updateMask().

m_arrow_length

int Kwave::SignalView::PositionWidget::m_arrow_length

private

the length of the arrows [pixel]

Definition at line 395 of file SignalView.h.

Referenced by setText(), and updateMask().

m_label

QLabel* Kwave::SignalView::PositionWidget::m_label

private

the label that contains the text

Definition at line 386 of file SignalView.h.

Referenced by PositionWidget(), setText(), and ~PositionWidget().

m_last_alignment

Qt::Alignment Kwave::SignalView::PositionWidget::m_last_alignment

private

for detecting changes: previous width

Definition at line 398 of file SignalView.h.

Referenced by updateMask().

m_last_size

QSize Kwave::SignalView::PositionWidget::m_last_size

private

for detecting changes: previous size

Definition at line 401 of file SignalView.h.

Referenced by updateMask().

m_polygon

QPolygon Kwave::SignalView::PositionWidget::m_polygon

private

polygon used as widget outline

Definition at line 404 of file SignalView.h.

Referenced by paintEvent(), and updateMask().

m_radius

int Kwave::SignalView::PositionWidget::m_radius

private

the radius of the corners [pixel]

Definition at line 392 of file SignalView.h.

Referenced by setText().

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

• libgui/SignalView.h
• libgui/SignalView.cpp