draggableframelesswidget.cpp

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//=============================================================================================================
 
//=============================================================================================================
// INCLUDES
//=============================================================================================================
 
#include "draggableframelesswidget.h"
 
//=============================================================================================================
// QT INCLUDES
//=============================================================================================================
 
#include <QWidget>
#include <QMouseEvent>
 
//=============================================================================================================
// EIGEN INCLUDES
//=============================================================================================================
 
//=============================================================================================================
// USED NAMESPACES
//=============================================================================================================
 
using namespace DISPLIB;
 
//=============================================================================================================
// DEFINE MEMBER METHODS
//=============================================================================================================
 
DraggableFramelessWidget::DraggableFramelessWidget(QWidget *parent,
                                                   Qt::WindowFlags flags,
                                                   bool bRoundEdges,
                                                   bool bDraggable,
                                                   bool bFrameless)
: QWidget(parent, flags)
, m_bRoundEdges(bRoundEdges)
, m_bDraggable(bDraggable)
, m_bMousePressed(false)
{
    this->setWindowFlag(Qt::CustomizeWindowHint, bFrameless);
    this->adjustSize();
}
 
//=============================================================================================================
 
DraggableFramelessWidget::~DraggableFramelessWidget()
{
}
 
//=============================================================================================================
 
void DraggableFramelessWidget::setDraggable(bool bFlag)
{
    m_bDraggable = bFlag;
}
 
//=============================================================================================================
 
void DraggableFramelessWidget::mousePressEvent(QMouseEvent *event)
{
    if(!m_bDraggable) {
        return QWidget::mousePressEvent(event);
    }
 
    if (event->button() == Qt::LeftButton) {
        m_dragPosition = event->globalPosition().toPoint() - frameGeometry().topLeft();
        event->accept();
        m_bMousePressed = true;
    }
}
 
//=============================================================================================================
 
void DraggableFramelessWidget::mouseMoveEvent(QMouseEvent *event)
{
    if(!m_bDraggable) {
        return QWidget::mouseMoveEvent(event);
    }
 
    if ((event->buttons() & Qt::LeftButton) && m_bMousePressed) {
        move(event->globalPosition().toPoint() - m_dragPosition);
        event->accept();
    }
}
 
//=============================================================================================================
 
void DraggableFramelessWidget::mouseReleaseEvent(QMouseEvent *event )
{
    if(event->button() == Qt::LeftButton) {
        m_bMousePressed = false;
    }
}
 
//=============================================================================================================
 
void DraggableFramelessWidget::resizeEvent(QResizeEvent * /* event */)
{
    if(m_bRoundEdges) {
        setMask(roundedRect(QRect(0,0,width(),height()),10));
    }
}
 
//=============================================================================================================
 
QRegion DraggableFramelessWidget::roundedRect(const QRect& rect, int r)
{
    QRegion region;
    // middle and borders
    region += rect.adjusted(r, 0, -r, 0);
    region += rect.adjusted(0, r, 0, -r);
    // top left
    QRect corner(rect.topLeft(), QSize(r*2, r*2));
    region += QRegion(corner, QRegion::Ellipse);
    // top right
    corner.moveTopRight(rect.topRight());
    region += QRegion(corner, QRegion::Ellipse);
    // bottom left
    corner.moveBottomLeft(rect.bottomLeft());
    region += QRegion(corner, QRegion::Ellipse);
    // bottom right
    corner.moveBottomRight(rect.bottomRight());
    region += QRegion(corner, QRegion::Ellipse);
    return region;
}