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Improve implementation of TabWorkArea::posIsTab()

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The Qt documentation states that tabAt() returns -1 if the position
is not over a tab. This behavior has been consistent since Qt 4.3
[1]. This commit's improvement likely makes the code faster in two
ways:

(1) we do not need to loop through potentially all tabs
(2) we only need to look up the tab index corresponding with one
position

posIsTab() is not currently used intensively so no practical gain in
speed is achieved, but it protects against future use.

[1] https://doc.qt.io/archives/4.3/qtabbar.html#tabAt
This commit is contained in:
Scott Kostyshak 2016-07-29 13:06:49 -04:00
parent 9c3ddbf7a0
commit badb0bb96c
1 changed files with 2 additions and 4 deletions
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6
src/frontends/qt4/GuiWorkArea.cpp
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@ -1650,10 +1650,8 @@ void TabWorkArea::paintEvent(QPaintEvent * event)
bool TabWorkArea::posIsTab(QPoint position)
{
for (int i = 0; i < count(); ++i)
if (tabBar()->tabRect(i).contains(position))
return true;
return false;
// tabAt returns -1 if tab does not covers position
return tabBar()->tabAt(position) > -1;
}