KCanvasPreview Class Reference

#include <kcanvaspreview.h>

Inheritance diagram for KCanvasPreview:

Public Slots
void	setxOffsetLock (bool)
void	setyOffsetLock (bool)

Signals
void	sigModifiedXOffset (int)
void	sigModifiedYOffset (int)

Public Member Functions
	KCanvasPreview (QWidget *parent=0)
void	mouseMoveEvent (QMouseEvent *event) override
void	mousePressEvent (QMouseEvent *event) override
void	mouseReleaseEvent (QMouseEvent *) override
void	paintEvent (QPaintEvent *) override
void	setCanvasSize (qint32 w, qint32 h)
void	setImageOffset (qint32 x, qint32 y)
void	setImageSize (qint32 w, qint32 h)
bool	xOffsetLocked () const
bool	yOffsetLocked () const
	~KCanvasPreview () override

Protected Member Functions
bool	isInRegion (QPoint point)
double	scalingFactor ()

Protected Attributes
bool	m_dragging {false}
qint32	m_height {0}
QImage	m_image
qint32	m_imageHeight {0}
qint32	m_imageWidth {0}
QPoint	m_prevDragPoint
qint32	m_width {0}
qint16	m_xCanvasOffset {0}
qint32	m_xOffset {0}
bool	m_xOffsetLocked {false}
qint16	m_yCanvasOffset {0}
qint32	m_yOffset {0}
bool	m_yOffsetLocked {false}

Detailed Description

Definition at line 13 of file kcanvaspreview.h.

Constructor & Destructor Documentation

KCanvasPreview()

KCanvasPreview::KCanvasPreview

(

QWidget *

parent = 0

)

Definition at line 14 of file kcanvaspreview.cc.

                                               : QWidget(parent), m_dragging(false)
{
    setMouseTracking(true);
}

~KCanvasPreview()

KCanvasPreview::~KCanvasPreview ( )

override

Definition at line 19 of file kcanvaspreview.cc.

{
}

Member Function Documentation

isInRegion()

bool KCanvasPreview::isInRegion ( QPoint point )

protected

Definition at line 82 of file kcanvaspreview.cc.

{
    double scale = scalingFactor();
 
    if ((point.x() >= (m_xOffset * scale) + m_xCanvasOffset) && (point.x() < ((m_xOffset + m_imageWidth) * scale) + m_xCanvasOffset) &&
            (point.y() >= (m_yOffset * scale) + m_yCanvasOffset) && (point.y() < ((m_yOffset + m_imageHeight) * scale) + m_yCanvasOffset)) {
        return true;
    }
 
    return false;
}

References m_imageHeight, m_imageWidth, m_xCanvasOffset, m_xOffset, m_yCanvasOffset, m_yOffset, and scalingFactor().

mouseMoveEvent()

void KCanvasPreview::mouseMoveEvent ( QMouseEvent * event )

override

Definition at line 50 of file kcanvaspreview.cc.

{
    if (m_dragging) {
        // calculate new image offset
        double scale = scalingFactor();
        int newXOffset , newYOffset;
        if(!xOffsetLocked()) {
          newXOffset = ((event->pos().x() - m_prevDragPoint.x()) / scale) + m_xOffset;
        }
        if(!yOffsetLocked()) {
          newYOffset = ((event->pos().y() - m_prevDragPoint.y()) / scale) + m_yOffset;
        }
        m_prevDragPoint = event->pos();
        if(!xOffsetLocked()) {
          Q_EMIT sigModifiedXOffset(newXOffset);
        }
        if(!yOffsetLocked()) {
          Q_EMIT sigModifiedYOffset(newYOffset);
        }
    } else {
        QCursor cursor;
 
        if (isInRegion(event->pos())) {
            cursor.setShape(Qt::SizeAllCursor);
        } else {
            cursor.setShape(Qt::ArrowCursor);
        }
 
        setCursor(cursor);
    }
}

References isInRegion(), m_dragging, m_prevDragPoint, m_xOffset, m_yOffset, scalingFactor(), sigModifiedXOffset(), sigModifiedYOffset(), xOffsetLocked(), and yOffsetLocked().

mousePressEvent()

void KCanvasPreview::mousePressEvent ( QMouseEvent * event )

override

Definition at line 37 of file kcanvaspreview.cc.

{
    if (isInRegion(event->pos())) {
        m_dragging = true;
        m_prevDragPoint = event->pos();
    }
}

References isInRegion(), m_dragging, and m_prevDragPoint.

mouseReleaseEvent()

void KCanvasPreview::mouseReleaseEvent ( QMouseEvent * )

override

Definition at line 45 of file kcanvaspreview.cc.

{
    m_dragging = false;
}

References m_dragging.

paintEvent()

void KCanvasPreview::paintEvent ( QPaintEvent * )

override

Definition at line 23 of file kcanvaspreview.cc.

{
    QPainter p(this);
 
    double scale = scalingFactor();
 
    m_xCanvasOffset = (width() - scale * m_width) / 2.0;
    m_yCanvasOffset = (height() - scale * m_height) / 2.0;
 
    p.fillRect(m_xCanvasOffset, m_yCanvasOffset, m_width * scale, m_height * scale, QBrush(Qt::white));
    p.setPen(QPen(Qt::red));
    p.drawRect(m_xCanvasOffset + m_xOffset * scale, m_yCanvasOffset + m_yOffset * scale, m_imageWidth * scale, m_imageHeight * scale);
}

References m_height, m_imageHeight, m_imageWidth, m_width, m_xCanvasOffset, m_xOffset, m_yCanvasOffset, m_yOffset, p, and scalingFactor().

scalingFactor()

double KCanvasPreview::scalingFactor ( )

protected

Definition at line 94 of file kcanvaspreview.cc.

{
    // take into account offset frame size to show when the canvas has been shrunk
    const int maxHeight = (m_height > m_imageHeight) ? m_height : m_imageHeight;
    const int maxWidth = (m_width > m_imageWidth) ? m_width : m_imageWidth;
 
    const double xScale = (double)(height() - 1) / maxHeight;
    const double yScale = (double)(width() - 1) / maxWidth;
 
    return (xScale < yScale) ? xScale : yScale;
}

References m_height, m_imageHeight, m_imageWidth, and m_width.

setCanvasSize()

void KCanvasPreview::setCanvasSize	(	qint32	w,
		qint32	h )

Definition at line 114 of file kcanvaspreview.cc.

{
    m_width = w;
    m_height = h;
 
    update();
}

References m_height, and m_width.

setImageOffset()

void KCanvasPreview::setImageOffset	(	qint32	x,
		qint32	y )

Definition at line 122 of file kcanvaspreview.cc.

{
    m_xOffset = x;
    m_yOffset = y;
 
    update();
}

References m_xOffset, and m_yOffset.

setImageSize()

void KCanvasPreview::setImageSize	(	qint32	w,
		qint32	h )

Definition at line 106 of file kcanvaspreview.cc.

{
    m_imageWidth = w;
    m_imageHeight = h;
 
    update();
}

References m_imageHeight, and m_imageWidth.

setxOffsetLock

void KCanvasPreview::setxOffsetLock ( bool value )

slot

Definition at line 133 of file kcanvaspreview.cc.

{
    m_xOffsetLocked = value;
}

References m_xOffsetLocked, and value().

setyOffsetLock

void KCanvasPreview::setyOffsetLock ( bool value )

slot

Definition at line 141 of file kcanvaspreview.cc.

{
    m_yOffsetLocked = value;
}

References m_yOffsetLocked, and value().

sigModifiedXOffset

void KCanvasPreview::sigModifiedXOffset ( int )

signal

sigModifiedYOffset

void KCanvasPreview::sigModifiedYOffset ( int )

signal

xOffsetLocked()

bool KCanvasPreview::xOffsetLocked

(

)

const

Definition at line 129 of file kcanvaspreview.cc.

{
    return m_xOffsetLocked;
}

References m_xOffsetLocked.

yOffsetLocked()

bool KCanvasPreview::yOffsetLocked

(

)

const

Definition at line 137 of file kcanvaspreview.cc.

{
    return m_yOffsetLocked;
}

References m_yOffsetLocked.

Member Data Documentation

m_dragging

bool KCanvasPreview::m_dragging {false}

protected

Definition at line 52 of file kcanvaspreview.h.

{false};

m_height

qint32 KCanvasPreview::m_height {0}

protected

Definition at line 47 of file kcanvaspreview.h.

{0}, m_height {0};

m_image

QImage KCanvasPreview::m_image

protected

Definition at line 54 of file kcanvaspreview.h.

m_imageHeight

qint32 KCanvasPreview::m_imageHeight {0}

protected

Definition at line 48 of file kcanvaspreview.h.

{0}, m_imageHeight {0};

m_imageWidth

qint32 KCanvasPreview::m_imageWidth {0}

protected

Definition at line 48 of file kcanvaspreview.h.

{0}, m_imageHeight {0};

m_prevDragPoint

QPoint KCanvasPreview::m_prevDragPoint

protected

Definition at line 55 of file kcanvaspreview.h.

m_width

qint32 KCanvasPreview::m_width {0}

protected

Definition at line 47 of file kcanvaspreview.h.

{0}, m_height {0};

m_xCanvasOffset

qint16 KCanvasPreview::m_xCanvasOffset {0}

protected

Definition at line 51 of file kcanvaspreview.h.

{0}, m_yCanvasOffset {0};

m_xOffset

qint32 KCanvasPreview::m_xOffset {0}

protected

Definition at line 49 of file kcanvaspreview.h.

{0}, m_yOffset {0};

m_xOffsetLocked

bool KCanvasPreview::m_xOffsetLocked {false}

protected

Definition at line 57 of file kcanvaspreview.h.

{false};

m_yCanvasOffset

qint16 KCanvasPreview::m_yCanvasOffset {0}

protected

Definition at line 51 of file kcanvaspreview.h.

{0}, m_yCanvasOffset {0};

m_yOffset

qint32 KCanvasPreview::m_yOffset {0}

protected

Definition at line 49 of file kcanvaspreview.h.

{0}, m_yOffset {0};

m_yOffsetLocked

bool KCanvasPreview::m_yOffsetLocked {false}

protected

Definition at line 58 of file kcanvaspreview.h.

{false};

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

• libs/ui/kcanvaspreview.h
• libs/ui/kcanvaspreview.cc