Eeschema highlight symbols (cross probing) fix a few issues.

Fix highlight not cleared by Pcbnew.
Fix highlight not cleared by Cvpcb (missing code).
Add comments. Remove a few now useless printf used for debug
When clicking on a empty area, clear any highligthed symbols

Fixes: lp:1809977
https://bugs.launchpad.net/kicad/+bug/1809977

cvpcb/cvpcb_mainframe.cpp

@@ -274,6 +274,10 @@ void CVPCB_MAINFRAME::OnCloseWindow( wxCloseEvent& Event )
 
     m_modified = false;
 
+    // clear highlight symbol in schematic:
+    SendMessageToEESCHEMA( true );
+
+    // Delete window
     Destroy();
 }
 
@@ -717,22 +721,35 @@ bool CVPCB_MAINFRAME::LoadFootprintFiles()
 }
 
 
-void CVPCB_MAINFRAME::SendMessageToEESCHEMA()
+void CVPCB_MAINFRAME::SendMessageToEESCHEMA( bool aClearHighligntOnly )
 {
     if( m_netlist.IsEmpty() )
         return;
 
+    // clear highlight of previously selected components (if any):
+    // Selecting a non existing symbol clears any previously highlighted symbols
+    std::string packet = "$PART: \"$DUMMY$\"";
+
+    if( Kiface().IsSingle() )
+        SendCommand( MSG_TO_SCH, packet.c_str() );
+    else
+        Kiway().ExpressMail( FRAME_SCH, MAIL_CROSS_PROBE, packet, this );
+
+    if( aClearHighligntOnly )
+        return;
+
     int selection = m_compListBox->GetSelection();
 
-    if ( selection < 0 )
+    if ( selection < 0 )    // Nothing selected
-        selection = 0;
+        return;
 
     if( m_netlist.GetComponent( selection ) == NULL )
         return;
 
+    // Now highlight the selected component:
     COMPONENT* component = m_netlist.GetComponent( selection );
 
-    std::string packet = StrPrintf( "$PART: \"%s\"", TO_UTF8( component->GetReference() ) );
+    packet = StrPrintf( "$PART: \"%s\"", TO_UTF8( component->GetReference() ) );
 
     if( Kiface().IsSingle() )
         SendCommand( MSG_TO_SCH, packet.c_str() );

cvpcb/cvpcb_mainframe.h

@@ -288,8 +288,10 @@ public:
      * Send a remote command to Eeschema via a socket,
      * Commands are
      * $PART: "reference"   put cursor on component anchor
+     * @param aClearHighligntOnly = true if the message to send is only "clear highlight"
+     * (used when exiting Cvpcb)
      */
-    void SendMessageToEESCHEMA();
+    void SendMessageToEESCHEMA( bool aClearHighligntOnly = false );
 
     COMPONENT* GetSelectedComponent();
 

eeschema/cross-probing.cpp

@@ -108,8 +108,9 @@ void SCH_EDIT_FRAME::ExecuteRemoteCommand( const char* cmdline )
     /* look for a complement */
     idcmd = strtok( NULL, " \n\r" );
 
-    if( idcmd == NULL )    // component only
+    if( idcmd == NULL )    // Highlight component only (from Cvpcb or Pcbnew)
     {
+        // Highlight component part_ref, or clear Highlight, if part_ref is not existing
         FindComponentAndItem( part_ref, true, FIND_COMPONENT_ONLY, wxEmptyString );
         return;
     }

eeschema/find.cpp

@@ -235,12 +235,9 @@ SCH_ITEM* SCH_EDIT_FRAME::FindComponentAndItem( const wxString& aReference,
 
     SetStatusText( msg );
 
-    if( foundItem )
+    // highlight selection if foundItem is not null, or clear any highlight selection
-    {
-        // highlight selection
     GetCanvas()->GetView()->HighlightItem( foundItem, pin );
     GetCanvas()->Refresh();
-    }
 
     return item;
 }

eeschema/onleftclick.cpp

@@ -62,10 +62,9 @@ void SCH_EDIT_FRAME::OnLeftClick( wxDC* aDC, const wxPoint& aPosition )
 {
     SCH_ITEM*   item = GetScreen()->GetCurItem();
     wxPoint     gridPosition = GetGridPosition( aPosition );
-    DBG(printf("mousep %d %d gridp %d %d\n", aPosition.x, aPosition.y, gridPosition.x, gridPosition.y );)
 
-
+    if( ( GetToolId() == ID_NO_TOOL_SELECTED ) ||
-    if( ( GetToolId() == ID_NO_TOOL_SELECTED ) || ( item && item->GetFlags() ) )
+        ( item && ( item->GetFlags() & ~HIGHLIGHTED ) ) )
     {
         m_canvas->SetAutoPanRequest( false );
         SetRepeatItem( NULL );
@@ -108,6 +107,9 @@ void SCH_EDIT_FRAME::OnLeftClick( wxDC* aDC, const wxPoint& aPosition )
         }
     }
 
+    if( !item ) // If clicked on a empty area, clear any highligthed symbol
+        GetCanvas()->GetView()->HighlightItem( nullptr, nullptr );
+
     switch( GetToolId() )
     {
     case ID_NO_TOOL_SELECTED:

eeschema/onrightclick.cpp

@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2014 Jean-Pierre Charras, jp.charras at wanadoo.fr
  * Copyright (C) 2008 Wayne Stambaugh <stambaughw@gmail.com>
- * Copyright (C) 2004-2017 KiCad Developers, see change_log.txt for contributors.
+ * Copyright (C) 2004-2018 KiCad Developers, see AUTHORS.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -48,6 +48,7 @@
 #include <sch_sheet_path.h>
 #include <sch_bitmap.h>
 #include <symbol_lib_table.h>
+#include <sch_view.h>
 
 #include <iostream>
 
@@ -76,7 +77,9 @@ bool SCH_EDIT_FRAME::OnRightClick( const wxPoint& aPosition, wxMenu* PopMenu )
     bool        blockActive = GetScreen()->IsBlockActive();
     wxString    msg;
 
-    DBG(printf("on-rclick cur %p blk %d\n", item, blockActive ? 1 : 0 );)
+    // Ugly hack, clear any highligthed symbol, because the HIGHLIGHT flag create issues when creating menus
+    // Will be fixed later
+    GetCanvas()->GetView()->HighlightItem( nullptr, nullptr );
 
     // Do not start a block command on context menu.
     m_canvas->SetCanStartBlock( -1 );
@@ -142,9 +145,6 @@ bool SCH_EDIT_FRAME::OnRightClick( const wxPoint& aPosition, wxMenu* PopMenu )
         bool actionCancelled = false;
         item = LocateAndShowItem( aPosition, SCH_COLLECTOR::AllItemsButPins, 0, &actionCancelled );
 
-        printf("Locateandshow %d %d item %p type %d\n", aPosition.x, aPosition.y,
-                    item, item ? item->Type() : 0 ); fflush(0);
-
         // If the clarify item selection context menu is aborted, don't show the context menu.
         if( item == NULL && actionCancelled )
             return false;

eeschema/sch_view.h

@@ -93,7 +93,11 @@ public:
     void ShowSelectionArea( bool aShow = true );
     void ShowPreview( bool aShow = true );
 
+    /**
+     * Clear the hide flag of all items in the view
+     */
     void ClearHiddenFlags();
+
     void HideWorksheet();
 
     void HighlightItem( EDA_ITEM *aItem, LIB_PIN* aPin = nullptr );