Fixed issue #2201 (trace path)

* you can zoom in now to select the end point. Problem was
  actually that zooming in was a problem when the start point
  went out of the viewport

In addition:
* Messages are sticky now ("Click on second point")
* "Esc" will cancel path trace mode
* The cursor switches back to normal after tracing

src/laybasic/laybasic/layFinder.cc

@@ -63,7 +63,7 @@ static int inst_point_sel_tests = 10000;
 
 Finder::Finder (bool point_mode, bool top_level_sel)
   : m_min_level (0), m_max_level (0),
-    mp_layout (0), mp_view (0), m_cv_index (0), m_point_mode (point_mode), m_catch_all (false), m_top_level_sel (top_level_sel)
+    mp_layout (0), mp_view (0), m_cv_index (0), m_point_mode (point_mode), m_catch_all (false), m_consider_viewport (true), m_top_level_sel (top_level_sel)
 {
   m_distance = std::numeric_limits<double>::max ();
 }
@@ -482,7 +482,10 @@ ShapeFinder::visit_cell (const db::Cell &cell, const db::Box &hit_box, const db:
   checkpoint ();
 
   //  Viewport in current cell coordinate space (DBU)
-  db::Box viewport_box = (vp * db::CplxTrans (layout ().dbu ()) * t).inverted () * db::DBox (0, 0, view ()->viewport ().width (), view ()->viewport ().height ());
+  db::Box viewport_box;
+  if (consider_viewport ()) {
+    viewport_box = (vp * db::CplxTrans (layout ().dbu ()) * t).inverted () * db::DBox (0, 0, view ()->viewport ().width (), view ()->viewport ().height ());
+  }
 
   if (! m_context_layers.empty ()) {
 
@@ -583,7 +586,7 @@ ShapeFinder::visit_cell (const db::Cell &cell, const db::Box &hit_box, const db:
 
             bool any_valid_edge = m_capture_all_shapes;
             for (db::Shape::polygon_edge_iterator e = shape->begin_edge (); ! e.at_end (); ++e) {
-              if ((*e).clipped (viewport_box).first) {
+              if (viewport_box.empty () || (*e).clipped (viewport_box).first) {
                 any_valid_edge = true;
                 test_edge (t, *e, d, match);
               }
@@ -606,7 +609,7 @@ ShapeFinder::visit_cell (const db::Cell &cell, const db::Box &hit_box, const db:
               ++pt;
               for (; pt != shape->end_point (); ++pt) {
                 db::Edge e (p, *pt);
-                if (e.clipped (viewport_box).first) {
+                if (viewport_box.empty () || e.clipped (viewport_box).first) {
                   any_valid_edge = true;
                   test_edge (t, e, d, match);
                 }
@@ -618,7 +621,7 @@ ShapeFinder::visit_cell (const db::Cell &cell, const db::Box &hit_box, const db:
             db::Polygon poly;
             shape->polygon (poly);
             for (db::Polygon::polygon_edge_iterator e = poly.begin_edge (); ! e.at_end (); ++e) {
-              if ((*e).clipped (viewport_box).first) {
+              if (viewport_box.empty () || (*e).clipped (viewport_box).first) {
                 any_valid_edge = true;
                 test_edge (t, *e, d, match);
               }
@@ -651,7 +654,7 @@ ShapeFinder::visit_cell (const db::Cell &cell, const db::Box &hit_box, const db:
               //  convert to polygon and test those edges
               db::Polygon poly (box);
               for (db::Polygon::polygon_edge_iterator e = poly.begin_edge (); ! e.at_end (); ++e) {
-                if ((*e).clipped (viewport_box).first) {
+                if (viewport_box.empty () || (*e).clipped (viewport_box).first) {
                   any_valid_edge = true;
                   test_edge (t, *e, d, match);
                 }
@@ -819,7 +822,10 @@ InstFinder::visit_cell (const db::Cell &cell, const db::Box &search_box, const d
   checkpoint ();
 
   //  Viewport in current cell coordinate space (DBU)
-  db::Box viewport_box = (vp * db::CplxTrans (layout ().dbu ()) * t).inverted () * db::DBox (0, 0, view ()->viewport ().width (), view ()->viewport ().height ());
+  db::Box viewport_box;
+  if (consider_viewport ()) {
+    viewport_box = (vp * db::CplxTrans (layout ().dbu ()) * t).inverted () * db::DBox (0, 0, view ()->viewport ().width (), view ()->viewport ().height ());
+  }
 
   if (! point_mode ()) {
 
@@ -952,7 +958,7 @@ InstFinder::visit_cell (const db::Cell &cell, const db::Box &search_box, const d
               bool any_valid_edge = false;
               for (db::Polygon::polygon_edge_iterator e = poly.begin_edge (); ! e.at_end (); ++e) {
                 //  only consider edges that cut through the viewport
-                if ((*e).clipped (viewport_box).first) {
+                if (viewport_box.empty () || (*e).clipped (viewport_box).first) {
                   any_valid_edge = true;
                   test_edge (t, *e, d, match);
                 }

src/laybasic/laybasic/layFinder.h

@@ -96,6 +96,25 @@ public:
     m_catch_all = f;
   }
 
+  /**
+   *  @brief Gets a flag indicating that the viewport will be considered
+   */
+  bool consider_viewport () const
+  {
+    return m_consider_viewport;
+  }
+
+  /**
+   *  @brief Sets a flag indicating that the viewport will be considered
+   *  If this flag is true (the default), only shapes and instances will be considered
+   *  if edges (or polygons) or boundary edges (for instances) are visible in the
+   *  viewport. If this flag is false, shapes or instances are considered always.
+   */
+  void set_consider_viewport (bool f)
+  {
+    m_consider_viewport = f;
+  }
+
   /**
    *  @brief Destructor (just provided to please the compiler)
    */
@@ -217,6 +236,7 @@ private:
   double m_distance;
   bool m_point_mode;
   bool m_catch_all;
+  bool m_consider_viewport;
   bool m_top_level_sel;
   db::box_convert <db::CellInst, false> m_box_convert;
   db::box_convert <db::Cell, false> m_cell_box_convert;

src/laybasic/laybasic/layViewObject.cc

@@ -621,7 +621,10 @@ END_PROTECTED
 void 
 ViewObjectUI::set_cursor (lay::Cursor::cursor_shape cursor)
 {
-  m_cursor = cursor;
+  if (m_cursor != cursor) {
+    m_cursor = cursor;
+    realize_cursor ();
+  }
 }
 
 void
@@ -629,15 +632,7 @@ ViewObjectUI::set_default_cursor (lay::Cursor::cursor_shape cursor)
 {
   if (cursor != m_default_cursor) {
     m_default_cursor = cursor;
-#if defined(HAVE_QT)
-    if (m_cursor == lay::Cursor::none && mp_widget) {
-      if (m_default_cursor == lay::Cursor::none) {
-        mp_widget->unsetCursor ();
-      } else {
-        mp_widget->setCursor (lay::Cursor::qcursor (m_default_cursor));
-      }
-    }
-#endif
+    realize_cursor ();
   }
 }
 
@@ -652,11 +647,17 @@ ViewObjectUI::ensure_entered ()
 void 
 ViewObjectUI::begin_mouse_event (lay::Cursor::cursor_shape cursor)
 {
-  m_cursor = cursor;
+  set_cursor (cursor);
 }
 
 void 
 ViewObjectUI::end_mouse_event ()
+{
+  realize_cursor ();
+}
+
+void
+ViewObjectUI::realize_cursor ()
 {
 #if defined(HAVE_QT)
   if (mp_widget) {

src/laybasic/laybasic/layViewObject.h

@@ -285,6 +285,14 @@ public:
    */
   virtual void drag_cancel () { }
 
+  /**
+   *  @brief Gets a value indicating whether the mouse receiver claims the view message bar
+   *
+   *  If this method returns true, other services are not supposed to emit transient
+   *  messages.
+   */
+  virtual bool claims_message_bar () const { return false; }
+
   /**
    *  @brief Gets a value indicating whether a cursor position it set
    */
@@ -1121,6 +1129,7 @@ private:
   void objects_changed ();
   int widget_height () const;
   int widget_width () const;
+  void realize_cursor ();
 
   /**
    *  @brief Register a service