From d2b4e07c94999efcf9968daeb01eb479f4195f09 Mon Sep 17 00:00:00 2001
From: jkriege2 <jan@jkrieger.de>
Date: Fri, 11 Sep 2020 13:48:07 +0200
Subject: [PATCH] added JPQTPlotter signal, when widget was resized

---
 doc/dox/whatsnew.dox            |  1 +
 lib/jkqtplotter/jkqtplotter.cpp |  5 ++++-
 lib/jkqtplotter/jkqtplotter.h   | 10 ++++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/doc/dox/whatsnew.dox b/doc/dox/whatsnew.dox
index 6bd4d86116..fab6a399d9 100644
--- a/doc/dox/whatsnew.dox
+++ b/doc/dox/whatsnew.dox
@@ -30,6 +30,7 @@ Changes, compared to  \ref page_whatsnew_V2019_11 "v2019.11" include:
   <li>new: all geometric objects can either be drawn as graphic element (i.e. lines are straight line, even on non-linear axes), or as mathematical curve (i.e. on non-linear axes, lines become the appropriate curve representing the linear function, connecting the given start/end-points). The only exceptions are ellipses (and the derived arcs,pies,chords), which are always drawn as mathematical curves</li>
   <li>new: a new graph class JKQTPXYFunctionLineGraph draws parametric 2D curves ( \f$ [x,y] = f(t) \f$ ), see \ref JKQTPlotterEvalCurves for an example</li>
   <li>new: added several new copy/set-functions to JKQTPDatastore</li>
+  <li>new: added JPQTPlotter signal, when widget was resized</li>
 </ul>
 
 \subsection page_whatsnew_TRUNK_DOWNLOAD trunk: Download
diff --git a/lib/jkqtplotter/jkqtplotter.cpp b/lib/jkqtplotter/jkqtplotter.cpp
index 71a4e04447..891ddd6ced 100644
--- a/lib/jkqtplotter/jkqtplotter.cpp
+++ b/lib/jkqtplotter/jkqtplotter.cpp
@@ -1217,7 +1217,10 @@ void JKQTPlotter::delayedResizeEvent()
         sizeChanged=true;
     }
 
-    if (sizeChanged) redrawPlot();
+    if (sizeChanged) {
+        emit widgetResized(width(), height(), this);
+        redrawPlot();
+    }
 }
 
 void JKQTPlotter::leaveEvent(QEvent * /*event*/) {
diff --git a/lib/jkqtplotter/jkqtplotter.h b/lib/jkqtplotter/jkqtplotter.h
index b070915004..13e1046c88 100644
--- a/lib/jkqtplotter/jkqtplotter.h
+++ b/lib/jkqtplotter/jkqtplotter.h
@@ -1319,6 +1319,16 @@ class JKQTPLOTTER_LIB_EXPORT JKQTPlotter: public QWidget {
          */
         void zoomChangedLocally(double newxmin, double newxmax, double newymin, double newymax, JKQTPlotter* sender);
 
+        /** \brief signal: emitted whenever the widget is resized
+         *
+         * \param new_width new width of the widget (in pixels)
+         * \param new_height new height of the widget (in pixels)
+         * \param sender JKQTPlotter sending this event
+         *
+         * This signal is designed to be connected to these slots: synchronizeXAxis(), synchronizeYAxis(), synchronizeXYAxis()
+         */
+        void widgetResized(int new_width, int new_height, JKQTPlotter* sender);
+
         /** \brief emitted when the mouse action JKQTPlotter::ScribbleEvents and a click event from the mouse occurs inside the plot,
          *         or the mouse moved while the left button is pressed down
          *