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Fix forms when inertially scrolling

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`setViewport` automatically adds an item to the history if it finds that it
moved for more than a page, which we don't want to do when automatically
scrolling, as with inertial scrolling.

This commit adds a new function `setViewportWithHistory()` which takes an
argument to optionally avoid preserving history. This avoids breaking ABI.
The new history-less functionality is used when inertially scrolling.

BUG: 421354
FIXED-IN: 1.11.2
This commit is contained in:
Kezi Olio 2020-08-16 16:21:35 +02:00 committed by Nate Graham
parent 601e96037c
commit bdb2df773d
3 changed files with 34 additions and 15 deletions
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33
core/document.cpp
View file

@ -3445,19 +3445,8 @@ void Document::setPrevPage()
setViewport( DocumentViewport( (*d->m_viewportIterator).pageNumber - 1 ) );
}
*/
void Document::setViewportPage(int page, DocumentObserver *excludeObserver, bool smoothMove)
{
// clamp page in range [0 ... numPages-1]
if (page < 0)
page = 0;
else if (page > (int)d->m_pagesVector.count())
page = d->m_pagesVector.count() - 1;
// make a viewport from the page and broadcast it
setViewport(DocumentViewport(page), excludeObserver, smoothMove);
}
void Document::setViewport(const DocumentViewport &viewport, DocumentObserver *excludeObserver, bool smoothMove)
void Document::setViewportWithHistory(const DocumentViewport &viewport, DocumentObserver *excludeObserver, bool smoothMove, bool updateHistory)
{
if (!viewport.isValid()) {
qCDebug(OkularCoreDebug) << "invalid viewport:" << viewport.toString();
@ -3477,7 +3466,7 @@ void Document::setViewport(const DocumentViewport &viewport, DocumentObserver *e
const int oldPageNumber = oldViewport.pageNumber;
// set internal viewport taking care of history
if (oldViewport.pageNumber == viewport.pageNumber || !oldViewport.isValid()) {
if (oldViewport.pageNumber == viewport.pageNumber || !oldViewport.isValid() || !updateHistory) {
// if page is unchanged save the viewport at current position in queue
oldViewport = viewport;
} else {
@ -3506,6 +3495,24 @@ void Document::setViewport(const DocumentViewport &viewport, DocumentObserver *e
}
}
void Document::setViewportPage(int page, DocumentObserver *excludeObserver, bool smoothMove)
{
// clamp page in range [0 ... numPages-1]
if (page < 0)
page = 0;
else if (page > (int)d->m_pagesVector.count())
page = d->m_pagesVector.count() - 1;
// make a viewport from the page and broadcast it
setViewport(DocumentViewport(page), excludeObserver, smoothMove);
}
void Document::setViewport(const DocumentViewport &viewport, DocumentObserver *excludeObserver, bool smoothMove)
{
// set viewport, updating history
setViewportWithHistory(viewport, excludeObserver, smoothMove, true);
}
void Document::setZoom(int factor, DocumentObserver *excludeObserver)
{
// notify change to all other (different from id) observers

11
core/document.h
View file

@ -431,6 +431,17 @@ public:
*/
void setViewport(const DocumentViewport &viewport, DocumentObserver *excludeObserver = nullptr, bool smoothMove = false);
/**
* Sets the current document viewport to the given @p viewport.
* BCI TODO: merge with setViewport, adding a parameter "bool updateHistory = true"
*
* @param viewport The document viewport.
* @param excludeObserver The observer which shouldn't be effected by this change.
* @param smoothMove Whether the move shall be animated smoothly.
* @param updateHistory Whether to consider the change of viewport for the history navigation
*/
void setViewportWithHistory(const DocumentViewport &viewport, DocumentObserver *excludeObserver = nullptr, bool smoothMove = false, bool updateHistory = true);
/**
* Sets the current document viewport to the next viewport in the
* viewport history.

5
ui/pageview.cpp
View file

@ -4360,7 +4360,7 @@ static void slotRequestPreloadPixmap(Okular::DocumentObserver *observer, const P
void PageView::slotRequestVisiblePixmaps(int newValue)
{
// if requests are blocked (because raised by an unwanted event), exit
if (d->blockPixmapsRequest || d->scroller->state() == QScroller::Scrolling)
if (d->blockPixmapsRequest)
return;
// precalc view limits for intersecting with page coords inside the loop
@ -4503,7 +4503,8 @@ void PageView::slotRequestVisiblePixmaps(int newValue)
newViewport.rePos.normalizedX = focusedX;
newViewport.rePos.normalizedY = focusedY;
// set the viewport to other observers
d->document->setViewport(newViewport, this);
// do not update history if the viewport is autoscrolling
d->document->setViewportWithHistory(newViewport, this, false, d->scroller->state() == QScroller::Scrolling);
}
d->document->setVisiblePageRects(visibleRects, this);
}