ADDED: New appearance control widget for PcbNew

Featuring:
- Layer view presets
- Per-type opacity for tracks, vias, pads, zones
- Net and netclass color and visibility controls

CHANGED: Simplified object visibilty controls

Fixes https://gitlab.com/kicad/code/kicad/-/issues/1951
Fixes https://gitlab.com/kicad/code/kicad/-/issues/1981
Fixes https://gitlab.com/kicad/code/kicad/-/issues/2003
Fixes https://gitlab.com/kicad/code/kicad/-/issues/2173
Fixes https://gitlab.com/kicad/code/kicad/-/issues/2254
Fixes https://gitlab.com/kicad/code/kicad/-/issues/4325

common/widgets/bitmap_toggle.cpp

@@ -0,0 +1,72 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
+ * @author Jon Evans <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <widgets/bitmap_toggle.h>
+
+
+wxDEFINE_EVENT( TOGGLE_CHANGED, wxCommandEvent );
+
+
+BITMAP_TOGGLE::BITMAP_TOGGLE( wxWindow *aParent, wxWindowID aId, const wxBitmap& aCheckedBitmap,
+                              const wxBitmap& aUncheckedBitmap, bool aChecked ) :
+        wxPanel( aParent, aId ),
+        m_checked( aChecked ),
+        m_unchecked_bitmap( aUncheckedBitmap ),
+        m_checked_bitmap( aCheckedBitmap )
+{
+    wxBoxSizer* sizer = new wxBoxSizer( wxHORIZONTAL );
+    SetSizer( sizer );
+
+    const wxBitmap& bitmap = aChecked ? m_checked_bitmap : m_unchecked_bitmap;
+
+    m_bitmap = new wxStaticBitmap( this, aId, bitmap, wxDefaultPosition, bitmap.GetSize() );
+
+    sizer->Add( m_bitmap, 0, 0 );
+
+    m_bitmap->Bind( wxEVT_LEFT_UP,
+                    [&]( wxMouseEvent& )
+                    {
+                        SetValue( !GetValue() );
+                        wxCommandEvent event( TOGGLE_CHANGED );
+                        event.SetInt( m_checked );
+                        event.SetEventObject( this );
+                        wxPostEvent( this, event );
+                    } );
+
+    auto passOnEvent =
+            [&]( wxEvent& aEvent )
+            {
+                wxPostEvent( this, aEvent );
+            };
+
+    m_bitmap->Bind( wxEVT_RIGHT_DOWN, passOnEvent );
+    m_bitmap->Bind( wxEVT_RIGHT_UP, passOnEvent );
+}
+
+
+void BITMAP_TOGGLE::SetValue( bool aValue )
+{
+    m_checked = aValue;
+    m_bitmap->SetBitmap( aValue ? m_checked_bitmap : m_unchecked_bitmap );
+}