Update QTreeView tooltips as they change #3403

1 files changed, 51 insertions, 0 deletions

diff --git a/src/gui/tooltipupdater.h b/src/gui/tooltipupdater.h
new file mode 100644
index 000000000..ae32882d4
--- /dev/null
+++ b/src/gui/tooltipupdater.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) by Christian Kamm <mail@ckamm.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include <QObject>
+#include <QPoint>
+
+class QTreeView;
+
+namespace OCC {
+
+/**
+ * @brief Updates tooltips of items in a QTreeView when they change.
+ * @ingroup gui
+ *
+ * Usually tooltips are not updated as they change. Since we want to
+ * use tooltips to show rapidly updating progress information, we
+ * need to make sure that that information is displayed to the user
+ * as it changes.
+ *
+ * To accomplish that, the eventFilter() stores the tooltip's position
+ * and the dataChanged() slot updates the tooltip if Qt::ToolTipRole
+ * gets updated while a tooltip is shown.
+ */
+class ToolTipUpdater : public QObject
+{
+    Q_OBJECT
+public:
+    ToolTipUpdater(QTreeView* treeView);
+
+protected:
+    bool eventFilter(QObject* obj, QEvent* ev) Q_DECL_OVERRIDE;
+
+private slots:
+    void dataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight, const QVector<int>& roles);
+
+private:
+    QTreeView* _treeView;
+    QPoint _toolTipPos;
+};
+
+} // namespace OCC