// creates a new tabbar
TabBar::TabBar(QWidget* parent, const char* /*name*/)
: QWidget(parent)
, d(new TabBarPrivate)
{
d->tabbar = this;
d->readOnly = false;
d->firstTab = 1;
d->lastTab = 0;
d->activeTab = 0;
d->targetTab = 0;
d->wheelDelta = 0;
d->autoScroll = false;
d->offset = 64;
// initialize the scroll buttons
d->scrollFirstButton = new QToolButton(this);
connect(d->scrollFirstButton, SIGNAL(clicked()),
this, SLOT(scrollFirst()));
d->scrollLastButton = new QToolButton(this);
connect(d->scrollLastButton, SIGNAL(clicked()),
this, SLOT(scrollLast()));
d->scrollBackButton = new QToolButton(this);
connect(d->scrollBackButton, SIGNAL(clicked()),
this, SLOT(scrollBack()));
d->scrollForwardButton = new QToolButton(this);
connect(d->scrollForwardButton, SIGNAL(clicked()),
this, SLOT(scrollForward()));
d->layoutButtons();
d->updateButtons();
}
void TabBar::autoScrollBack()
{
if (!d->autoScroll) return;
scrollBack();
if (!canScrollBack())
d->autoScroll = false;
else
QTimer::singleShot(400, this, SLOT(autoScrollBack()));
}
void KoTabBar::wheelEvent( QWheelEvent * e )
{
if ( d->tabs.count() == 0 )
{
update();
return;
}
// Currently one wheel movement is a delta of 120.
// The 'unused' delta is stored for devices that allow
// a higher scrolling resolution.
// The delta required to move one tab is one wheel movement:
const int deltaRequired = 120;
d->wheelDelta += e->delta();
int tabDelta = - (d->wheelDelta / deltaRequired);
d->wheelDelta = d->wheelDelta % deltaRequired;
int numTabs = d->tabs.size();
if(d->activeTab + tabDelta > numTabs)
{
// Would take us past the last tab
d->activeTab = numTabs;
}
else if (d->activeTab + tabDelta < 1)
{
// Would take us before the first tab
d->activeTab = 1;
}
else
{
d->activeTab = d->activeTab + tabDelta;
}
// Find the left and right edge of the new tab. If we're
// going forward, and the right of the new tab isn't visible
// then scroll forward. Likewise, if going back, and the
// left of the new tab isn't visible, then scroll back.
int activeTabRight = d->tabRects[ d->activeTab-1 ].right();
int activeTabLeft = d->tabRects[ d->activeTab-1 ].left();
if(tabDelta > 0 && activeTabRight > width() - d->offset )
{
scrollForward();
}
else if(tabDelta < 0 && activeTabLeft < width() - d->offset )
{
scrollBack();
}
update();
emit tabChanged( d->tabs[ d->activeTab-1] );
}
void TabBar::ensureVisible(const QString& tab)
{
int i = d->tabs.indexOf(tab);
if (i == -1)
return;
i++;
// already visible, then do nothing
if ((i >= d->firstTab) && (i <= d->lastTab))
return;
if (i < d->firstTab)
while (i < d->firstTab)
scrollBack();
if (i > d->lastTab)
while (i > d->lastTab)
scrollForward();
}
