TutorialButton.cpp

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/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#include "Logger.h"
#include <qdebug.h>
#include <QGraphicsRectItem>
#include <QGraphicsScene>
#include <QGraphicsTextItem>
#include <qmath.h>
#include "TutorialButton.h"
#include "TutorialButtonRect.h"
#include "TutorialButtonText.h"
 
const int HORIZONTAL_PADDING = 10;
const int VERTICAL_PADDING = 5;
const double Z_IN_FRONT = 1;
 
TutorialButton::TutorialButton (const QString &text,
                                QGraphicsScene &scene) :
  m_rect (nullptr),
  m_text (nullptr)
{
  createRect (scene);
  createText (text);
}
 
TutorialButton::~TutorialButton ()
{
  if (m_rect != nullptr) {
    QGraphicsScene *scene = m_rect->scene();
    scene->removeItem (m_rect); // This also removes m_text from the scene
 
    delete m_rect;
  }
  delete m_text;
}
 
void TutorialButton::createRect (QGraphicsScene &scene)
{
  // Create rectangle and text items
  m_rect = new TutorialButtonRect (*this);
  m_rect->show ();
  m_rect->setPen (QPen (Qt::gray));
  m_rect->setBrush (QBrush (Qt::white));
  m_rect->setZValue (Z_IN_FRONT);
  scene.addItem (m_rect);
}
 
void TutorialButton::createText (const QString &text)
{
  // Create text. There is no need to call QGraphicsScene::addItem since it gets added automatically as the
  // child of m_rect
  m_text = new TutorialButtonText (*this,
                                   text,
                                   m_rect);
  m_text->show ();
}
 
QSize TutorialButton::size () const
{
  // The size of the rectangle is not updated until later so we use the size of the text
  return QSize (qFloor (m_text->boundingRect().size().width() + 2 * HORIZONTAL_PADDING),
                qFloor (m_text->boundingRect().size().height() + 2 * VERTICAL_PADDING));
}
 
void TutorialButton::handleTriggered()
{
  qCInfo(ENGAUGE_LOG) << "TutorialButton::handleTriggered";
 
  // Relay signal from internal widgets to outside world
  emit signalTriggered ();
}
 
void TutorialButton::setGeometry (const QPoint &pos)
{
  // Size the rectangle to fit the text, now that the extent of the text is known, with padding on the four sides
  m_rect->setRect(pos.x(),
                  pos.y(),
                  m_text->boundingRect().width() + 2 * HORIZONTAL_PADDING,
                  m_text->boundingRect().height() + 2 * VERTICAL_PADDING);
 
  // Put text at the center of the rectangle
  m_text->setPos (pos.x() + m_rect->boundingRect().width() / 2.0 - m_text->boundingRect().width() / 2.0,
                  pos.y() + m_rect->boundingRect().height() / 2.0 - m_text->boundingRect().height() / 2.0);
}