Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.4.0 FF
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None
Description
- Run the example qtwebengine/examples/pdf/multipage with a multi-page PDF
- Zoom in (maybe several times)
- Scroll to the end
- Zoom out
The result is you will see an empty viewport, because now TableView.contentHeight should be much less, but in fact it's currently looking at a region that is beyond the end of document. The vertical scrollbar goes missing in this condition. You just have to use the mouse wheel briefly to trigger it to return to bounds.
We should somehow trigger QQuickFlickable::returnToBounds() at the right time, perhaps; but doing that immediately doesn't seem to help.
Since https://codereview.qt-project.org/c/qt/qtwebengine/+/298999 we have this rebuild() workaround, which fixes some cases, just not this one:
Item {
/*!
\qmlproperty real PdfMultiPageView::renderScale
This property holds the ratio of pixels to points. The default is \c 1,
meaning one point (1/72 of an inch) equals 1 logical pixel.
\sa PdfPageImage::status
*/
property real renderScale: 1
TableView {
model: modelInUse && root.document ? root.document.pageCount : 0
// workaround to make TableView do scheduleRebuildTable(RebuildOption::All) in cases when forceLayout() doesn't
property bool modelInUse: true
function rebuild() {
modelInUse = false
modelInUse = true
returnToBounds(); // doesn't help
}
// end workaround
...
onRenderScaleChanged: {
// if navigationStack.jumped changes the scale, don't turn around and update the stack again;
// and don't force layout either, because positionViewAtCell() will do that
if (navigationStack.jumping)
return
// make TableView rebuild from scratch, because otherwise it doesn't know the delegates are changing size
tableView.rebuild()
}