Several changes:

    - Added TargetDownload for Anchors and PushButton
    - Fix js exception thrown with new version of tinyMCE
    - Possibly fix #4417: the child process is stopped before it can generate a new session.
    - Fixed bounds limiting for horizontal charts
    - WAxisSliderWidget: Rescue render state from being overridden by render
    - add unsetDraggable in WInteractiveWidget #3814
    - Only setFormObject(true) when WPaintedWidget is inside WApplication
    - WCartesianChart: setInitialZoom/Pan -> setZoom/Pan, WPaintedWidget formData synced from client to server
    - Update Hostname if session reload is false and user hostname used to access server changed (#3730)
    - Interactive charts: configurable mouse wheel modifiers (merges the Bruce Toll's patch in issue #4373, with some changes)
    - Update tooltip locations with interactive WCartesianChart (merge of Bruce Toll's patches provided in issue #4358)
    - Fix autoplay not working in progressive bootstrap in chrome
    - WAxisSliderWideget: Disable slider widget, erase canvas, and log error when series is not line series of curve series
    - WCartesianChart: Perform corrections for rotated labels
    - WTemplate: fix !encodeTemplateText() behavior
    - WCartesianChart: Fix rotated axis label text clipping issue
    - WCartesianChart: touch interaction sort of working on FF nightly
    - WEnvironment: also read protocol from an X-Forwarded- header
    - fix JSon serialization of doubles, and fix JWt url encoding from WServer::post
    - Fix IE8 no longer working with Wt
    - fix #469 (do not require first to select before dragging an item)

Author: Koen Deforche

src/Wt/Chart/WAxis

@@ -614,20 +614,22 @@ public:
    */
   virtual WString label(double u) const;
 
-  /*! \brief Sets the initial zoom level for this axis.
+  /*! \brief Sets the zoom level for this axis.
    *
    * Only applies to a WCartesianChart in interactive mode.
    * The zoom level should be >= 1 and smaller than maxZoom()
    *
    * \note This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
    */
-  void setInitialZoom(double initialZoom);
+  void setZoom(double zoom);
 
-  /*! \brief Get the initial zoom level for this axis.
+  /*! \brief Get the zoom level for this axis.
    *
-   * \see setInitialZoom()
+   * \note If the zoom level has been changed on the client side, this may not reflect the actual zoom level.
+   *
+   * \see setZoom()
    */
-  double initialZoom() const;
+  double zoom() const;
 
   /*! \brief Sets the maximum zoom level for this axis.
    *
@@ -644,7 +646,7 @@ public:
    */
   double maxZoom() const;
 
-  /*! \brief Sets the initial value to pan to for this axis.
+  /*! \brief Sets the value to pan to for this axis.
    *
    * This sets the leftmost (horizontal axis)
    * or bottom (vertical axis) value to be displayed on the chart.
@@ -653,17 +655,20 @@ public:
    * the panning of the chart will be automatically adjusted.
    *
    * Only applies to a WCartesianChart in interactive mode.
-   * The zoom level should be >= 1 and smaller than maxZoom()
    *
    * \note This is only implemented for the X and first Y axis. It has no effect on the second Y axis.
+   *
+   * \note If the pan position has been changed on the client side, this may not reflect the actual pan position.
    */
-  void setInitialPan(double initialPan);
+  void setPan(double pan);
 
-  /*! \brief Get the initial value to pan to for this axis, when pan is enabled on the chart.
+  /*! \brief Get the value to pan to for this axis, when pan is enabled on the chart.
+   *
+   * \note 
    *
-   *  \see setInitialPan()
+   *  \see setPan()
    */
-  double initialPan() const;
+  double pan() const;
 
   /*! \brief Sets the padding between the chart area and this axis.
    *
@@ -749,7 +754,7 @@ protected:
 
   /*! \brief Represents a label/tick on the axis.
    */
-  struct TickLabel {
+  struct WT_API TickLabel {
     /*! \brief Enumeration for a tick type */
     enum TickLength { Zero, Short, Long };
 
@@ -800,8 +805,10 @@ private:
   WPen             textPen_;
   Orientation      titleOrientation_;
   double	   maxZoom_;
-  double	   initialZoom_;
-  double           initialPan_;
+  double	   zoom_;
+  double           pan_;
+  bool		   zoomDirty_;
+  bool             panDirty_;
   int              padding_;
   TickDirection    tickDirection_;
 
@@ -845,6 +852,7 @@ private:
   friend class WCartesianChart;
   friend class WCartesian3DChart;
   friend class WChart2DRenderer;
+  friend class WAxisSliderWidget;
 };
 
 template <typename T>

src/Wt/Chart/WAxis.C

@@ -145,8 +145,10 @@ WAxis::WAxis()
     textPen_(black),
     titleOrientation_(Horizontal),
     maxZoom_(4),
-    initialZoom_(1),
-    initialPan_(0),
+    zoom_(1),
+    pan_(0),
+    zoomDirty_(true),
+    panDirty_(true),
     padding_(0),
     tickDirection_(Outwards)
 {
@@ -1055,24 +1057,26 @@ WString WAxis::label(double u) const
   return text;
 }
 
-void WAxis::setInitialZoom(double initialZoom)
+void WAxis::setZoom(double zoom)
 {
-  set(initialZoom_, initialZoom);
+  set(zoom_, zoom);
+  zoomDirty_ = true;
 }
 
-double WAxis::initialZoom() const
+double WAxis::zoom() const
 {
-  return initialZoom_;
+  return zoom_;
 }
 
-void WAxis::setInitialPan(double initialPan)
+void WAxis::setPan(double pan)
 {
-  set(initialPan_, initialPan);
+  set(pan_, pan);
+  zoomDirty_ = true;
 }
 
-double WAxis::initialPan() const
+double WAxis::pan() const
 {
-  return initialPan_;
+  return pan_;
 }
 
 void WAxis::setPadding(int padding)
@@ -1607,6 +1611,7 @@ void WAxis::renderLabel(WPainter& painter,
     painter.save();
     painter.translate(transform.map(pos));
     painter.rotate(-angle);
+    transformedPoint = painter.worldTransform().inverted().map(transformedPoint);
     painter.drawText(WRectF(left - pos.x(), top - pos.y(), width, height),
 		     horizontalAlign | verticalAlign, TextSingleLine, text,
 		     clipping ? &transformedPoint : 0);

src/Wt/Chart/WAxisSliderWidget

@@ -134,6 +134,18 @@ public:
    */
   bool isAutoLayoutEnabled() const { return autoPadding_; }
 
+  /*! \brief Set whether to draw the X axis tick labels on the slider widget.
+   *
+   * Labels are enabled by default.
+   */
+  void setLabelsEnabled(bool enabled = true);
+
+  /*! \brief Returns whether the X axis tick labels are drawn.
+   *
+   * \sa setLabelsEnabled()
+   */
+  bool isLabelsEnabled() const { return labelsEnabled_; }
+
 protected:
   virtual void render(WFlags<RenderFlag> flags) WT_CXX11ONLY(override) ;
   virtual void paintEvent(WPaintDevice *paintDevice) WT_CXX11ONLY(override) ;
@@ -152,6 +164,7 @@ private:
   WBrush background_;
   WBrush selectedAreaBrush_;
   bool autoPadding_;
+  bool labelsEnabled_;
   int padding_[4];
 
   WJavaScriptHandle<WTransform> transform_;