statistics: remember position of legend when resizing

The position of the legend was reset when resizing. This was
OK as long as the legend wasn't movable.

To avoid resetting the position, store the center position
of the legend relatively to the size of the canvas. On
resize restore the center to the same relative size.

To avoid code duplication, move the sanitizing of the
coordinates from the StatsView to the Legend.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

1 files changed, 5 insertions, 0 deletions

diff --git a/stats/legend.h b/stats/legend.h
index 1e38f705a..fb88920bd 100644
--- a/stats/legend.h
+++ b/stats/legend.h
@@ -15,6 +15,7 @@ class Legend : public ChartRectItem {
 public:
 	Legend(StatsView &view, const std::vector<QString> &names);
 	void resize(); // called when the chart size changes.
+	void setPos(QPointF pos); // Attention: not virtual - always call on this class.
 private:
 	// Each entry is a text besides a rectangle showing the color
 	struct Entry {
@@ -28,6 +29,10 @@ private:
 	double width;
 	double height;
 	QFont font;
+	// The position is specified with respect to the center and in relative terms
+	// with respect to the canvas.
+	QPointF centerPos;
+	bool posInitialized;
 	int fontHeight;
 	std::vector<Entry> entries;
 	void hide();