Issue-1058: implemented backspace button for path and polygon (#1061)

src/edt/edt/edtService.cc

@@ -796,6 +796,17 @@ Service::mouse_click_event (const db::DPoint &p, unsigned int buttons, bool prio
   }
 }
 
+bool
+Service::key_event (unsigned int key, unsigned int buttons)
+{
+  if (view ()->is_editable () && m_editing && buttons == 0 && key == Qt::Key_Backspace) {
+    do_delete ();
+    return true;
+  } else {
+    return false;
+  }
+}
+
 void
 Service::activated ()
 {

src/edt/edt/edtService.h

@@ -322,6 +322,11 @@ public:
    */
   virtual bool mouse_double_click_event (const db::DPoint &p, unsigned int buttons, bool prio);
 
+  /**
+   *  @brief Implements the key handler
+   */
+  virtual bool key_event (unsigned int /*key*/, unsigned int /*buttons*/);
+
   /**
    *  @brief Implement the mouse mode: deactivate mouse mode
    */
@@ -430,6 +435,13 @@ protected:
    */
   virtual bool do_mouse_click (const db::DPoint & /*p*/) { return false; }
 
+  /**
+   *  @brief Reimplemented by the specific implementation of the shape editors
+   *
+   *  This method is called when the backspace button is pressed
+   */
+  virtual void do_delete () { }
+
   /**
    *  @brief Reimplemented by the specific implementation of the shape editors
    *

src/edt/edt/edtServiceImpl.cc

@@ -420,6 +420,16 @@ PolygonService::do_mouse_move_inactive (const db::DPoint &p)
   mouse_cursor_from_snap_details (snap_details);
 }
 
+void
+PolygonService::do_delete ()
+{
+  if (m_points.size () > 2) {
+    m_points.erase (m_points.end () - 2);
+    m_last = m_points.end()[-2];
+    update_marker ();
+  }
+}
+
 void
 PolygonService::do_mouse_move (const db::DPoint &p)
 {
@@ -1058,7 +1068,17 @@ PathService::do_mouse_click (const db::DPoint &p)
   return false;
 }
 
-void 
+void
+PathService::do_delete ()
+{
+  if (m_points.size () > 2) {
+    m_points.erase (m_points.end () - 2);
+    m_last = m_points.end()[-2];
+    update_marker ();
+  }
+}
+
+void
 PathService::do_finish_edit ()
 {
   //  one point is reserved for the "current one"

src/edt/edt/edtServiceImpl.h

@@ -89,6 +89,7 @@ public:
   PolygonService (db::Manager *manager, lay::LayoutView *view);
   
   virtual lay::PropertiesPage *properties_page (db::Manager *manager, QWidget *parent);
+  virtual void do_delete ();
   virtual void do_begin_edit (const db::DPoint &p);
   virtual void do_mouse_move (const db::DPoint &p);
   virtual void do_mouse_move_inactive (const db::DPoint &p);
@@ -181,6 +182,7 @@ public:
   virtual void do_mouse_move (const db::DPoint &p);
   virtual bool do_mouse_click (const db::DPoint &p);
   virtual void do_mouse_move_inactive (const db::DPoint &p);
+  virtual void do_delete ();
   virtual void do_finish_edit ();
   virtual void do_cancel_edit ();
   virtual bool do_activated ();

src/laybasic/laybasic/layEditorServiceBase.h

@@ -130,7 +130,6 @@ private:
   std::vector<lay::ViewObject *> m_mouse_cursor_markers;
   QColor m_cursor_color;
   bool m_cursor_enabled;
-  lay::LayoutView *mp_view;
   bool m_has_tracking_position;
   db::DPoint m_tracking_position;
 };