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Magnifier tool

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Jakub Melka
2020-02-22 18:27:33 +01:00
parent 5823df0443
commit e9bad256dc
13 changed files with 385 additions and 6 deletions
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100
PdfForQtLib/sources/pdfwidgettool.cpp
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@ -664,6 +664,7 @@ PDFToolManager::PDFToolManager(PDFDrawWidgetProxy* proxy, Actions actions, QObje
{
m_predefinedTools[FindTextTool] = new PDFFindTextTool(proxy, actions.findPrevAction, actions.findNextAction, this, parentDialog);
m_predefinedTools[SelectTextTool] = new PDFSelectTextTool(proxy, actions.selectTextToolAction, actions.copyTextAction, actions.selectAllAction, actions.deselectAction, this);
m_predefinedTools[MagnifierTool] = new PDFMagnifierTool(proxy, actions.magnifierAction, this);
for (PDFWidgetTool* tool : m_predefinedTools)
{
@ -719,6 +720,11 @@ PDFFindTextTool* PDFToolManager::getFindTextTool() const
return qobject_cast<PDFFindTextTool*>(m_predefinedTools[FindTextTool]);
}
PDFMagnifierTool* PDFToolManager::getMagnifierTool() const
{
return qobject_cast<PDFMagnifierTool*>(m_predefinedTools[MagnifierTool]);
}
void PDFToolManager::keyPressEvent(QWidget* widget, QKeyEvent* event)
{
event->ignore();
@ -802,5 +808,99 @@ void PDFToolManager::onToolActionTriggered(bool checked)
}
}
PDFMagnifierTool::PDFMagnifierTool(PDFDrawWidgetProxy* proxy, QAction* action, QObject* parent) :
BaseClass(proxy, action, parent),
m_magnifierSize(200),
m_magnifierZoom(2.0)
{
setCursor(Qt::BlankCursor);
}
void PDFMagnifierTool::mousePressEvent(QWidget* widget, QMouseEvent* event)
{
Q_UNUSED(widget);
event->accept();
}
void PDFMagnifierTool::mouseReleaseEvent(QWidget* widget, QMouseEvent* event)
{
Q_UNUSED(widget);
event->accept();
}
void PDFMagnifierTool::mouseMoveEvent(QWidget* widget, QMouseEvent* event)
{
Q_UNUSED(widget);
event->accept();
QPoint mousePos = event->pos();
if (m_mousePos != mousePos)
{
m_mousePos = mousePos;
getProxy()->repaintNeeded();
}
}
void PDFMagnifierTool::drawPostRendering(QPainter* painter, QRect rect) const
{
if (!m_mousePos.isNull())
{
QPainterPath path;
path.addEllipse(m_mousePos, m_magnifierSize, m_magnifierSize);
painter->save();
// Clip the painter path for magnifier
painter->setClipPath(path, Qt::IntersectClip);
painter->fillRect(rect, getProxy()->getPaperColor());
painter->scale(m_magnifierZoom, m_magnifierZoom);
// Jakub Melka: this must be explained. We want to display the origin (mouse position)
// at the same position to remain under scaling. If scale == 1, then we translate
// by -m_mousePos + m_mousePos = (0, 0). Otherwise we are m_mousePos / scale away
// from the original position. Example:
// m_mousePos = (100, 100), scale = 2
// we are translating by -(100, 100) + (50, 50) = -(50, 50),
// because origin at (100, 100) is now at position (50, 50) after scale. So, if it has to remain
// the same, we must translate by -(50, 50).
painter->translate(m_mousePos * (1.0 / m_magnifierZoom - 1.0));
getProxy()->drawPages(painter, rect);
painter->restore();
painter->setPen(Qt::black);
painter->setBrush(Qt::NoBrush);
painter->drawPath(path);
}
}
void PDFMagnifierTool::setActiveImpl(bool active)
{
BaseClass::setActiveImpl(active);
if (!active)
{
m_mousePos = QPoint();
}
}
PDFReal PDFMagnifierTool::getMagnifierZoom() const
{
return m_magnifierZoom;
}
void PDFMagnifierTool::setMagnifierZoom(const PDFReal& magnifierZoom)
{
m_magnifierZoom = magnifierZoom;
}
int PDFMagnifierTool::getMagnifierSize() const
{
return m_magnifierSize;
}
void PDFMagnifierTool::setMagnifierSize(int magnifierSize)
{
m_magnifierSize = magnifierSize;
}
} // namespace pdf