fenix/PDF4QT
1
0
Fork 0
mirror of https://github.com/JakubMelka/PDF4QT.git synced 2025-06-05 21:59:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

Issue #207: Zoom to Cursor (Zoom Anchoring)

Browse Source
This commit is contained in:
Jakub Melka
2024-08-31 19:25:08 +02:00
parent 2a93ca5a1f
commit b97e36ce0d
4 changed files with 32 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
Pdf4QtLibWidgets/sources/pdfdrawspacecontroller.cpp
View File

@ -1231,21 +1231,41 @@ QPoint PDFDrawWidgetProxy::scrollByPixels(QPoint offset)
return QPoint(m_horizontalOffset - oldHorizontalOffset, m_verticalOffset - oldVerticalOffset);
}
void PDFDrawWidgetProxy::zoom(PDFReal zoom)
void PDFDrawWidgetProxy::zoom(PDFReal zoom, std::optional<QPointF> widgetPosition)
{
const PDFReal clampedZoom = qBound(MIN_ZOOM, zoom, MAX_ZOOM);
if (m_zoom != clampedZoom)
{
const PDFReal oldHorizontalOffsetMM = m_horizontalOffset * m_pixelToDeviceSpaceUnit;
const PDFReal oldVerticalOffsetMM = m_verticalOffset * m_pixelToDeviceSpaceUnit;
if (widgetPosition.has_value())
{
QPointF point = widgetPosition.value();
m_zoom = clampedZoom;
const PDFReal posX = (m_horizontalOffset - point.x()) * m_pixelToDeviceSpaceUnit;
const PDFReal posY = (m_verticalOffset - point.y()) * m_pixelToDeviceSpaceUnit;
update();
m_zoom = clampedZoom;
// Try to restore offsets, so we are in the same place
setHorizontalOffset(oldHorizontalOffsetMM * m_deviceSpaceUnitToPixel);
setVerticalOffset(oldVerticalOffsetMM * m_deviceSpaceUnitToPixel);
update();
const PDFReal hp = posX / m_pixelToDeviceSpaceUnit + point.x();
const PDFReal vp = posY / m_pixelToDeviceSpaceUnit + point.y();
setHorizontalOffset(hp);
setVerticalOffset(vp);
}
else
{
const PDFReal oldHorizontalOffsetMM = m_horizontalOffset * m_pixelToDeviceSpaceUnit;
const PDFReal oldVerticalOffsetMM = m_verticalOffset * m_pixelToDeviceSpaceUnit;
m_zoom = clampedZoom;
update();
// Try to restore offsets, so we are in the same place
setHorizontalOffset(oldHorizontalOffsetMM * m_deviceSpaceUnitToPixel);
setVerticalOffset(oldVerticalOffsetMM * m_deviceSpaceUnitToPixel);
}
}
}