Eeschema: adjust the working/drawing area size on the page size.

This makes using Scrollbars more easy to use, especially for "small" page sizes like A or B.
Note also the working/drawing area size is bigger than the page size (3 times)

common/dialogs/dialog_page_settings.cpp

@@ -240,6 +240,9 @@ void DIALOG_PAGES_SETTINGS::OnOkClick( wxCommandEvent& event )
 
         if( LocalPrjConfigChanged() )
             m_parent->SaveProjectSettings( false );
+
+        // Call the post processing (if any) after changes
+        m_parent->OnPageSettingsChange();
     }
 
     event.Skip();

eeschema/libedit/lib_edit_frame.cpp

@@ -284,6 +284,15 @@ LIB_EDIT_FRAME::LIB_EDIT_FRAME( KIWAY* aKiway, wxWindow* aParent ) :
     GetGalCanvas()->GetView()->UseDrawPriority( true );
     GetGalCanvas()->GetGAL()->SetGridVisibility( IsGridVisible() );
     GetGalCanvas()->GetGAL()->SetAxesEnabled( true );
+
+    // Set the working/draw area size to display a symbol to a reasonable value:
+    // A 600mm x 600mm with a origin at the area center looks like a large working area
+    double max_size_x = Millimeter2iu( 600 );
+    double max_size_y = Millimeter2iu( 600 );
+    BOX2D bbox;
+    bbox.SetOrigin( -max_size_x /2, -max_size_y/2 );
+    bbox.SetSize( max_size_x, max_size_y );
+    GetCanvas()->GetView()->SetBoundary( bbox );
 }
 
 

eeschema/sch_base_frame.cpp

@@ -659,10 +659,6 @@ void SCH_BASE_FRAME::SyncView()
     auto gal = GetGalCanvas()->GetGAL();
 
     auto gs = screen->GetGridSize();
-
     gal->SetGridSize( VECTOR2D( gs.x, gs.y ));
-
-    DBG(printf("SyncView: grid %d %d\n", (int)gs.x, (int)gs.y );)
-
     GetGalCanvas()->GetView()->UpdateAllItems( KIGFX::ALL );
 }

eeschema/sch_draw_panel.cpp

@@ -150,12 +150,14 @@ void SCH_DRAW_PANEL::DisplayComponent( const LIB_PART* aComponent )
 
 }
 
+
 void SCH_DRAW_PANEL::DisplaySheet( const SCH_SHEET* aSheet )
 {
     view()->Clear();
     view()->DisplaySheet( const_cast<SCH_SHEET*>(aSheet) );
 }
 
+
 void SCH_DRAW_PANEL::DisplaySheet( const SCH_SCREEN *aScreen )
 {
     view()->Clear();
@@ -164,6 +166,7 @@ void SCH_DRAW_PANEL::DisplaySheet( const SCH_SCREEN *aScreen )
         view()->DisplaySheet( const_cast<SCH_SCREEN*>( aScreen ) );
 }
 
+
 void SCH_DRAW_PANEL::OnShow()
 {
     //m_view->RecacheAllItems();

eeschema/sch_edit_frame.cpp

@@ -1514,6 +1514,13 @@ void SCH_EDIT_FRAME::CommonSettingsChanged()
 }
 
 
+void SCH_EDIT_FRAME::OnPageSettingsChange()
+{
+    // Rebuild the sheet view (draw area and any other items):
+    DisplayCurrentSheet();
+}
+
+
 void SCH_EDIT_FRAME::ShowChangedLanguage()
 {
     // call my base class

eeschema/sch_edit_frame.h

@@ -636,6 +636,13 @@ public:
      */
     void DisplayCurrentSheet();
 
+    /**
+     * Called when modifying the page settings.
+     * In derived classes it can be used to modify parameters like draw area size,
+     * and any other local parameter related to the page settings.
+     */
+    void OnPageSettingsChange() override;
+
     /**
      * Set or reset the BRIGHTENED of connected objects inside the current sheet,
      * according to the highlighted net name.

eeschema/sch_view.cpp

@@ -47,11 +47,14 @@ SCH_VIEW::SCH_VIEW( bool aIsDynamic, SCH_BASE_FRAME* aFrame ) :
 {
     m_frame = aFrame;
     // Set m_boundary to define the max working area size. The default value
-    // is acceptable for Pcbnew and Gerbview, but too large for Eeschema.
+    // is acceptable for Pcbnew and Gerbview, but too large for Eeschema due to
+    // very different internal units.
     // So we have to use a smaller value.
-    // A better size could be a size depending on the worksheet size.
-    m_boundary.SetOrigin( -Millimeter2iu( 3200.0 ), -Millimeter2iu( 2000.0 ) );
-    m_boundary.SetSize( Millimeter2iu( 6400.0 ), Millimeter2iu( 4000.0 ) );
+    // A full size = 3 * MAX_PAGE_SIZE_EDITORS_MILS size allows a wide margin
+    // around the worksheet.
+    double max_size = MAX_PAGE_SIZE_EDITORS_MILS * IU_PER_MILS * 3.0;
+    m_boundary.SetOrigin( -max_size/4, -max_size/4 );
+    m_boundary.SetSize( max_size, max_size );
 }
 
 
@@ -60,9 +63,20 @@ SCH_VIEW::~SCH_VIEW()
 }
 
 
+void SCH_VIEW::ResizeSheetWorkingArea( SCH_SCREEN *aScreen )
+{
+    const PAGE_INFO& page_info = aScreen->GetPageSettings();
+    // A full size = 3 * page size allows a wide margin around the worksheet.
+    // This is useful to have a large working area.
+    double max_size_x = page_info.GetWidthMils() * IU_PER_MILS * 2.0;
+    double max_size_y = page_info.GetHeightMils() * IU_PER_MILS * 2.0;
+    m_boundary.SetOrigin( -max_size_x /4, -max_size_y/4 );
+    m_boundary.SetSize( max_size_x, max_size_y );
+}
+
+
 void SCH_VIEW::DisplaySheet( SCH_SCREEN *aScreen )
 {
-
     for( auto item = aScreen->GetDrawItems(); item; item = item->Next() )
         Add( item );
 
@@ -77,6 +91,8 @@ void SCH_VIEW::DisplaySheet( SCH_SCREEN *aScreen )
     else
         m_worksheet->SetSheetName( "" );
 
+    ResizeSheetWorkingArea( aScreen );
+
     m_selectionArea.reset( new KIGFX::PREVIEW::SELECTION_AREA( ) );
     m_preview.reset( new KIGFX::VIEW_GROUP () );
 

eeschema/sch_view.h

@@ -78,6 +78,9 @@ public:
     void DisplaySheet( SCH_SCREEN *aScreen );
     void DisplayComponent( LIB_PART *aPart );
 
+    // Call it to set new draw area limits (max working and draw area size)
+    void ResizeSheetWorkingArea( SCH_SCREEN *aScreen );
+
     KIGFX::PREVIEW::SELECTION_AREA* GetSelectionArea() const { return m_selectionArea.get(); }
 
     KIGFX::VIEW_GROUP* GetPreview() const { return m_preview.get(); }

eeschema/viewlib_frame.cpp

@@ -206,6 +206,15 @@ LIB_VIEW_FRAME::LIB_VIEW_FRAME( KIWAY* aKiway, wxWindow* aParent, FRAME_T aFrame
     GetGalCanvas()->GetViewControls()->SetSnapping( true );
     GetGalCanvas()->GetGAL()->SetAxesEnabled( true );
     GetGalCanvas()->GetGAL()->SetGridVisibility( IsGridVisible() );
+
+    // Set the working/draw area size to display a symbol to a reasonable value:
+    // A 450mm x 450mm with a origin at the area center looks like a large working area
+    double max_size_x = Millimeter2iu( 450 );
+    double max_size_y = Millimeter2iu( 450 );
+    BOX2D bbox;
+    bbox.SetOrigin( -max_size_x /2, -max_size_y/2 );
+    bbox.SetSize( max_size_x, max_size_y );
+    GetCanvas()->GetView()->SetBoundary( bbox );
 }
 
 

include/draw_frame.h

@@ -749,6 +749,13 @@ public:
     virtual void    ToolOnRightClick( wxCommandEvent& event );
     void            AdjustScrollBars( const wxPoint& aCenterPosition );
 
+    /**
+     * Called when modifying the page settings.
+     * In derived classes it can be used to modify parameters like draw area size,
+     * and any other local parameter related to the page settings.
+     */
+    virtual void OnPageSettingsChange() {};
+
     /**
      * Called when activating the frame.
      *