[PATCH 3/3] kernel-shark: Don't try to update the markers if no data is loaded

["Yordan Karadzhov (VMware)" <y.karadz@gmail.com>]

This change aims to avoid showing the labels of the time axis (zeros)
when no data is loaded.

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
 kernel-shark/src/KsMainWindow.cpp | 18 ++++++++++++------
 kernel-shark/src/KsMainWindow.hpp |  2 ++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/kernel-shark/src/KsMainWindow.cpp b/kernel-shark/src/KsMainWindow.cpp
index 8826cf5..c8d9d25 100644
--- a/kernel-shark/src/KsMainWindow.cpp
+++ b/kernel-shark/src/KsMainWindow.cpp
@@ -1210,12 +1210,20 @@ void KsMainWindow::_splitterMoved(int pos, int index)
 	_session.saveSplitterSize(_splitter);
 }
 
+void KsMainWindow::_updateMarkData()
+{
+	if (_data.size() < 1)
+		return;
+
+	_mState.updateLabels();
+	_graph.glPtr()->model()->update();
+}
+
 void KsMainWindow::_deselectActive()
 {
 	_view.clearSelection();
 	_mState.activeMarker().remove();
-	_mState.updateLabels();
-	_graph.glPtr()->model()->update();
+	_updateMarkData();
 }
 
 void KsMainWindow::_deselectA()
@@ -1226,8 +1234,7 @@ void KsMainWindow::_deselectA()
 		_view.passiveMarkerSelectRow(KS_NO_ROW_SELECTED);
 
 	_mState.markerA().remove();
-	_mState.updateLabels();
-	_graph.glPtr()->model()->update();
+	_updateMarkData();
 }
 
 void KsMainWindow::_deselectB()
@@ -1238,6 +1245,5 @@ void KsMainWindow::_deselectB()
 		_view.passiveMarkerSelectRow(KS_NO_ROW_SELECTED);
 
 	_mState.markerB().remove();
-	_mState.updateLabels();
-	_graph.glPtr()->model()->update();
+	_updateMarkData();
 }
diff --git a/kernel-shark/src/KsMainWindow.hpp b/kernel-shark/src/KsMainWindow.hpp
index 62e66a0..7e2e839 100644
--- a/kernel-shark/src/KsMainWindow.hpp
+++ b/kernel-shark/src/KsMainWindow.hpp
@@ -232,6 +232,8 @@ private:
 	void _error(const QString &text, const QString &errCode,
 		    bool resize, bool unloadPlugins);
 
+	void _updateMarkData();
+
 	void _deselectActive();
 
 	void _deselectA();
-- 
2.20.1