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ProjectTree: Improve resizing of project tree

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On each resize event the treeview iterated over all rows to get the
maximum width of them. That involves text layout and is very slow
with bigger trees.

So cache the size hint for the column and connect to all signals
that can potentially change the size hint.

Change-Id: I83a13982848df56515fed8225ced336096370546
Task-number: QTCREATORBUG-8075
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>
This commit is contained in:
Daniel Teske
2015-05-07 15:40:56 +02:00
parent 4b1cda0f7c
commit 0a23dd4e23
1 changed files with 56 additions and 0 deletions
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56
src/plugins/projectexplorer/projecttreewidget.cpp
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@@ -96,15 +96,71 @@ public:
m_context = new IContext(this);
m_context->setContext(Context(ProjectExplorer::Constants::C_PROJECT_TREE));
m_context->setWidget(this);
ICore::addContextObject(m_context);
connect(this, &ProjectTreeView::expanded,
this, &ProjectTreeView::invalidateSize);
connect(this, &ProjectTreeView::collapsed,
this, &ProjectTreeView::invalidateSize);
}
void invalidateSize()
{
m_cachedSize = -1;
}
void setModel(QAbstractItemModel *newModel)
{
// Note: Don't connect to column signals, as we have only one column
if (model()) {
QAbstractItemModel *m = model();
disconnect(m, &QAbstractItemModel::dataChanged,
this, &ProjectTreeView::invalidateSize);
disconnect(m, &QAbstractItemModel::layoutChanged,
this, &ProjectTreeView::invalidateSize);
disconnect(m, &QAbstractItemModel::modelReset,
this, &ProjectTreeView::invalidateSize);
disconnect(m, &QAbstractItemModel::rowsInserted,
this, &ProjectTreeView::invalidateSize);
disconnect(m, &QAbstractItemModel::rowsMoved,
this, &ProjectTreeView::invalidateSize);
disconnect(m, &QAbstractItemModel::rowsRemoved,
this, &ProjectTreeView::invalidateSize);
}
if (newModel) {
connect(newModel, &QAbstractItemModel::dataChanged,
this, &ProjectTreeView::invalidateSize);
connect(newModel, &QAbstractItemModel::layoutChanged,
this, &ProjectTreeView::invalidateSize);
connect(newModel, &QAbstractItemModel::modelReset,
this, &ProjectTreeView::invalidateSize);
connect(newModel, &QAbstractItemModel::rowsInserted,
this, &ProjectTreeView::invalidateSize);
connect(newModel, &QAbstractItemModel::rowsMoved,
this, &ProjectTreeView::invalidateSize);
connect(newModel, &QAbstractItemModel::rowsRemoved,
this, &ProjectTreeView::invalidateSize);
}
Utils::NavigationTreeView::setModel(newModel);
}
~ProjectTreeView()
{
ICore::removeContextObject(m_context);
delete m_context;
}
int sizeHintForColumn(int column) const override
{
if (m_cachedSize < 0)
m_cachedSize = Utils::NavigationTreeView::sizeHintForColumn(column);
return m_cachedSize;
}
private:
mutable int m_cachedSize = -1;
IContext *m_context;
};