X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3da17724b6a873579628356a92ade9c41f07d5a3..d5cc191c9cd48a915ce0dfc6e49511b2fddb6746:/samples/scroll/scroll.cpp

diff --git a/samples/scroll/scroll.cpp b/samples/scroll/scroll.cpp
index 8f5cba310c..d8bc171f06 100644
--- a/samples/scroll/scroll.cpp
+++ b/samples/scroll/scroll.cpp
@@ -1,196 +1,721 @@
-/*
- * Program: scroll
- *
- * Author: Robert Roebling
- *
- * Copyright: (C) 1998, Robert Roebling
- *
- */
-
-// For compilers that support precompilation, includes "wx/wx.h".
+/////////////////////////////////////////////////////////////////////////////
+// Name:        scroll.cpp
+// Purpose:     wxScrolled sample
+// Author:      Robert Roebling
+// RCS-ID:      $Id$
+// Copyright:   (C) 1998 Robert Roebling, 2002 Ron Lee, 2003 Matt Gregory
+//              (C) 2008 Vadim Zeitlin
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-#include "wx/wx.h"
+    #include "wx/wx.h"
 #endif
 
-#include "wx/image.h"
-#include "wx/listctrl.h"
 #include "wx/sizer.h"
 #include "wx/log.h"
+#include "wx/tglbtn.h"
+
+#ifndef wxHAS_IMAGES_IN_RESOURCES
+    #include "../sample.xpm"
+#endif
 
+// ----------------------------------------------------------------------------
+// a trivial example
+// ----------------------------------------------------------------------------
+
+// MySimpleCanvas: a scrolled window which draws a simple rectangle
+class MySimpleCanvas : public wxScrolled<wxWindow>
+{
+public:
+    enum
+    {
+        // these numbers are not multiple of 10 (our scroll step) to test for
+        // the absence of rounding errors (e.g. we should have one more page
+        // than WIDTH/10 to show the right side of the rectangle)
+        WIDTH = 292,
+        HEIGHT = 297
+    };
 
-// derived classes
+    MySimpleCanvas(wxWindow *parent)
+        : wxScrolled<wxWindow>(parent, wxID_ANY)
+    {
+        SetScrollRate( 10, 10 );
+        SetVirtualSize( WIDTH, HEIGHT );
+        SetBackgroundColour( *wxWHITE );
 
-class MyFrame;
-class MyApp;
+        Connect(wxEVT_PAINT, wxPaintEventHandler(MySimpleCanvas::OnPaint));
+    }
 
-// MyCanvas
+private:
+    void OnPaint(wxPaintEvent& WXUNUSED(event))
+    {
+        wxPaintDC dc(this);
+
+        // this call is vital: it adjusts the dc to account for the current
+        // scroll offset
+        PrepareDC(dc);
+
+        dc.SetPen( *wxRED_PEN );
+        dc.SetBrush( *wxTRANSPARENT_BRUSH );
+        dc.DrawRectangle( 0, 0, WIDTH, HEIGHT );
+    }
+};
+
+
+// MySimpleFrame: a frame which contains a MySimpleCanvas
+class MySimpleFrame : public wxFrame
+{
+public:
+    MySimpleFrame(wxWindow *parent)
+        : wxFrame(parent, wxID_ANY, "MySimpleCanvas")
+    {
+        new MySimpleCanvas(this);
+
+        // ensure that we have scrollbars initially
+        SetClientSize(MySimpleCanvas::WIDTH/2, MySimpleCanvas::HEIGHT/2);
+
+        Show();
+    }
+};
+
+// ----------------------------------------------------------------------
+// a more complex example
+// ----------------------------------------------------------------------
 
-class MyCanvas: public wxScrolledWindow
+// MyCanvas
+class MyCanvas : public wxScrolled<wxPanel>
 {
 public:
-    MyCanvas() {};
-    MyCanvas( wxWindow *parent, wxWindowID, const wxPoint &pos, const wxSize &size );
-    ~MyCanvas();
-    void OnPaint( wxPaintEvent &event );
-    void OnQueryPosition( wxCommandEvent &event );
-    void OnAddButton( wxCommandEvent &event );
-    void OnDeleteButton( wxCommandEvent &event );
-    void OnMoveButton( wxCommandEvent &event );
-    void OnScrollWin( wxCommandEvent &event );
-    void OnMouseDown( wxMouseEvent &event );
+    MyCanvas(wxWindow *parent);
+
+private:
+    void OnPaint(wxPaintEvent& event);
+    void OnQueryPosition(wxCommandEvent& event);
+    void OnAddButton(wxCommandEvent& event);
+    void OnDeleteButton(wxCommandEvent& event);
+    void OnMoveButton(wxCommandEvent& event);
+    void OnScrollWin(wxCommandEvent& event);
+    void OnMouseRightDown(wxMouseEvent& event);
+    void OnMouseWheel(wxMouseEvent& event);
 
     wxButton *m_button;
 
-    DECLARE_DYNAMIC_CLASS(MyCanvas)
     DECLARE_EVENT_TABLE()
 };
 
-// MyFrame
+class MyCanvasFrame : public wxFrame
+{
+public:
+    MyCanvasFrame(wxWindow *parent)
+        : wxFrame(parent, wxID_ANY, "MyCanvas")
+    {
+        m_canvas = new MyCanvas(this);
 
-class MyFrame: public wxFrame
+        wxMenu *menuFile = new wxMenu();
+        menuFile->Append(wxID_DELETE, "&Delete all");
+        menuFile->Append(wxID_NEW, "Insert &new");
+
+        wxMenuBar *mbar = new wxMenuBar();
+        mbar->Append(menuFile, "&File");
+        SetMenuBar( mbar );
+
+        Connect(wxID_DELETE, wxEVT_COMMAND_MENU_SELECTED,
+                wxCommandEventHandler(MyCanvasFrame::OnDeleteAll));
+        Connect(wxID_NEW, wxEVT_COMMAND_MENU_SELECTED,
+                wxCommandEventHandler(MyCanvasFrame::OnInsertNew));
+
+        Show();
+    }
+
+private:
+    void OnDeleteAll(wxCommandEvent& WXUNUSED(event))
+    {
+        m_canvas->DestroyChildren();
+    }
+
+    void OnInsertNew(wxCommandEvent& WXUNUSED(event))
+    {
+        (void)new wxButton(m_canvas, wxID_ANY, "Hello", wxPoint(100,100));
+    }
+
+    MyCanvas *m_canvas;
+};
+
+// ----------------------------------------------------------------------------
+// example using sizers with wxScrolled
+// ----------------------------------------------------------------------------
+
+const wxSize SMALL_BUTTON( 100, 50 );
+const wxSize LARGE_BUTTON( 300, 200 );
+
+class MySizerScrolledWindow : public wxScrolled<wxWindow>
 {
 public:
-    MyFrame();
+    MySizerScrolledWindow(wxWindow *parent);
 
-    void OnAbout( wxCommandEvent &event );
-    void OnQuit( wxCommandEvent &event );
+private:
+    // this button can be clicked to change its own size in the handler below,
+    // the window size will be automatically adjusted to fit the button
+    wxButton *m_button;
 
-    MyCanvas         *m_canvas;
-    wxTextCtrl       *m_log;
+    void OnResizeClick(wxCommandEvent& event);
+};
 
-    DECLARE_DYNAMIC_CLASS(MyFrame)
-    DECLARE_EVENT_TABLE()
+class MySizerFrame : public wxFrame
+{
+public:
+    MySizerFrame(wxWindow *parent)
+        : wxFrame(parent, wxID_ANY, "MySizerScrolledWindow")
+    {
+        new MySizerScrolledWindow(this);
+
+        // ensure that the scrollbars appear when the button becomes large
+        SetClientSize(LARGE_BUTTON/2);
+        Show();
+    }
 };
 
-// MyApp
+// ----------------------------------------------------------------------------
+// example showing scrolling only part of the window
+// ----------------------------------------------------------------------------
 
-class MyApp: public wxApp
+// this window consists of an empty space in its corner, column labels window
+// along its top, row labels window along its left hand side and a canvas in
+// the remaining space
+
+class MySubColLabels : public wxWindow
 {
 public:
-    virtual bool OnInit();
+    MySubColLabels(wxScrolled<wxWindow> *parent)
+        : wxWindow(parent, wxID_ANY)
+    {
+        m_owner = parent;
+
+        Connect(wxEVT_PAINT, wxPaintEventHandler(MySubColLabels::OnPaint));
+    }
+
+private:
+    void OnPaint(wxPaintEvent& WXUNUSED(event))
+    {
+        wxPaintDC dc(this);
+
+        // This is wrong..  it will translate both x and y if the
+        // window is scrolled, the label windows are active in one
+        // direction only.  Do the action below instead -- RL.
+        //m_owner->PrepareDC( dc );
+
+        int xScrollUnits, xOrigin;
+
+        m_owner->GetViewStart( &xOrigin, 0 );
+        m_owner->GetScrollPixelsPerUnit( &xScrollUnits, 0 );
+        dc.SetDeviceOrigin( -xOrigin * xScrollUnits, 0 );
+
+        dc.DrawText("Column 1", 5, 5);
+        dc.DrawText("Column 2", 105, 5);
+        dc.DrawText("Column 3", 205, 5);
+    }
+
+    wxScrolled<wxWindow> *m_owner;
 };
 
-// main program
+class MySubRowLabels : public wxWindow
+{
+public:
+    MySubRowLabels(wxScrolled<wxWindow> *parent)
+        : wxWindow(parent, wxID_ANY)
+    {
+        m_owner = parent;
 
-IMPLEMENT_APP(MyApp)
+        Connect(wxEVT_PAINT, wxPaintEventHandler(MySubRowLabels::OnPaint));
+    }
 
-// ids
+private:
+    void OnPaint(wxPaintEvent& WXUNUSED(event))
+    {
+        wxPaintDC dc(this);
 
-#define   ID_ADDBUTTON    1
-#define   ID_DELBUTTON    2
-#define   ID_MOVEBUTTON   3
-#define   ID_SCROLLWIN    4
-#define   ID_QUERYPOS     5
+        // This is wrong..  it will translate both x and y if the
+        // window is scrolled, the label windows are active in one
+        // direction only.  Do the action below instead -- RL.
+        //m_owner->PrepareDC( dc );
 
-#define   ID_NEWBUTTON    10
+        int yScrollUnits, yOrigin;
 
-// MyCanvas
+        m_owner->GetViewStart( 0, &yOrigin );
+        m_owner->GetScrollPixelsPerUnit( 0, &yScrollUnits );
+        dc.SetDeviceOrigin( 0, -yOrigin * yScrollUnits );
 
-IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
+        dc.DrawText("Row 1", 5, 5);
+        dc.DrawText("Row 2", 5, 30);
+        dc.DrawText("Row 3", 5, 55);
+        dc.DrawText("Row 4", 5, 80);
+        dc.DrawText("Row 5", 5, 105);
+        dc.DrawText("Row 6", 5, 130);
+    }
 
-BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
-  EVT_PAINT(                  MyCanvas::OnPaint)
-  EVT_MOUSE_EVENTS(                  MyCanvas::OnMouseDown)
-  EVT_BUTTON( ID_QUERYPOS,    MyCanvas::OnQueryPosition)
-  EVT_BUTTON( ID_ADDBUTTON,   MyCanvas::OnAddButton)
-  EVT_BUTTON( ID_DELBUTTON,   MyCanvas::OnDeleteButton)
-  EVT_BUTTON( ID_MOVEBUTTON,  MyCanvas::OnMoveButton)
-  EVT_BUTTON( ID_SCROLLWIN,   MyCanvas::OnScrollWin)
-END_EVENT_TABLE()
+    wxScrolled<wxWindow> *m_owner;
+};
 
-MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
-                    const wxPoint &pos, const wxSize &size )
-        : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER | wxTAB_TRAVERSAL, "test canvas" )
+class MySubCanvas : public wxPanel
 {
-    (void) new wxButton( this, ID_ADDBUTTON, "add button", wxPoint(10,10) );
-    (void) new wxButton( this, ID_DELBUTTON, "del button", wxPoint(10,40) );
-    (void) new wxButton( this, ID_MOVEBUTTON, "move button", wxPoint(150,10) );
-    (void) new wxButton( this, ID_SCROLLWIN, "scroll win", wxPoint(250,10) );
+public:
+    MySubCanvas(wxScrolled<wxWindow> *parent, wxWindow *cols, wxWindow *rows)
+        : wxPanel(parent, wxID_ANY)
+    {
+        m_owner = parent;
+        m_colLabels = cols;
+        m_rowLabels = rows;
+
+        (void)new wxButton(this, wxID_ANY, "Hallo I",
+                           wxPoint(0,50), wxSize(100,25) );
+        (void)new wxButton(this, wxID_ANY, "Hallo II",
+                           wxPoint(200,50), wxSize(100,25) );
+
+        (void)new wxTextCtrl(this, wxID_ANY, "Text I",
+                             wxPoint(0,100), wxSize(100,25) );
+        (void)new wxTextCtrl(this, wxID_ANY, "Text II",
+                             wxPoint(200,100), wxSize(100,25) );
+
+        (void)new wxComboBox(this, wxID_ANY, "ComboBox I",
+                             wxPoint(0,150), wxSize(100,25));
+        (void)new wxComboBox(this, wxID_ANY, "ComboBox II",
+                             wxPoint(200,150), wxSize(100,25));
+
+        SetBackgroundColour("WHEAT");
+
+        Connect(wxEVT_PAINT, wxPaintEventHandler(MySubCanvas::OnPaint));
+    }
+
+    // override the base class function so that when this window is scrolled,
+    // the labels are scrolled in sync
+    virtual void ScrollWindow(int dx, int dy, const wxRect *rect)
+    {
+        wxPanel::ScrollWindow( dx, dy, rect );
+        m_colLabels->ScrollWindow( dx, 0, rect );
+        m_rowLabels->ScrollWindow( 0, dy, rect );
+    }
 
-    wxString choices[] =
+private:
+    void OnPaint(wxPaintEvent& WXUNUSED(event))
     {
-        "This",
-        "is one of my",
-        "really",
-        "wonderful",
-        "examples."
+        wxPaintDC dc( this );
+        m_owner->PrepareDC( dc );
+
+        dc.SetPen( *wxBLACK_PEN );
+
+        // OK, let's assume we are a grid control and we have two
+        // grid cells. Here in OnPaint we want to know which cell
+        // to redraw so that we prevent redrawing cells that don't
+        // need to get redrawn. We have one cell at (0,0) and one
+        // more at (200,0), both having a size of (100,25).
+
+        // We can query how much the window has been scrolled
+        // by calling CalcUnscrolledPosition()
+
+        int scroll_x = 0;
+        int scroll_y = 0;
+        m_owner->CalcUnscrolledPosition( scroll_x, scroll_y, &scroll_x, &scroll_y );
+
+        // We also need to know the size of the window to see which
+        // cells are completely hidden and not get redrawn
+
+        int size_x = 0;
+        int size_y = 0;
+        GetClientSize( &size_x, &size_y );
+
+        // First cell: (0,0)(100,25)
+        // It it on screen?
+        if ((0+100-scroll_x > 0) && (0+25-scroll_y > 0) &&
+            (0-scroll_x < size_x) && (0-scroll_y < size_y))
+        {
+            // Has the region on screen been exposed?
+            if (IsExposed(0,0,100,25))
+            {
+                dc.DrawRectangle( 0, 0, 100, 25 );
+                dc.DrawText("First Cell", 5, 5);
+            }
+        }
+
+
+        // Second cell: (0,200)(100,25)
+        // It it on screen?
+        if ((200+100-scroll_x > 0) && (0+25-scroll_y > 0) &&
+            (200-scroll_x < size_x) && (0-scroll_y < size_y))
+        {
+            // Has the region on screen been exposed?
+            if (IsExposed(200,0,100,25))
+            {
+                dc.DrawRectangle( 200, 0, 100, 25 );
+                dc.DrawText("Second Cell", 205, 5);
+            }
+        }
+    }
+
+    wxScrolled<wxWindow> *m_owner;
+    wxWindow *m_colLabels,
+             *m_rowLabels;
+};
+
+class MySubScrolledWindow : public wxScrolled<wxWindow>
+{
+public:
+    enum
+    {
+        CORNER_WIDTH = 60,
+        CORNER_HEIGHT = 25
     };
-  
-    m_button = new wxButton( this, ID_QUERYPOS, "Query position", wxPoint(10,110) );
-  
-    (void) new wxTextCtrl( this, -1, "wxTextCtrl", wxPoint(10,150), wxSize(80,-1) );
-  
-    (void) new wxRadioButton( this, -1, "Disable", wxPoint(10,190) );
-  
-    (void) new wxComboBox( this, -1, "This", wxPoint(10,230), wxDefaultSize, 5, choices );
-  
-    (void) new wxRadioBox( this, -1, "This", wxPoint(10,310), wxDefaultSize, 5, choices, 2, wxRA_SPECIFY_COLS );
-
-    (void) new wxRadioBox( this, -1, "This", wxPoint(10,440), wxDefaultSize, 5, choices, 2, wxRA_SPECIFY_ROWS );
-
-    wxListCtrl *m_listCtrl = new wxListCtrl(
-	this, -1, wxPoint(200, 110), wxSize(180, 120),
-	wxLC_REPORT | wxSIMPLE_BORDER | wxLC_SINGLE_SEL );
-
-    m_listCtrl->InsertColumn(0, "First", wxLIST_FORMAT_LEFT, 90);
-    m_listCtrl->InsertColumn(1, "Last", wxLIST_FORMAT_LEFT, 90);
-
-    for ( int i=0; i < 30; i++)
+
+    MySubScrolledWindow(wxWindow *parent)
+        : wxScrolled<wxWindow>(parent, wxID_ANY)
+    {
+        // create the children
+        MySubColLabels *cols = new MySubColLabels(this);
+        MySubRowLabels *rows = new MySubRowLabels(this);
+
+        m_canvas = new MySubCanvas(this, cols, rows);
+
+        // lay them out
+        wxFlexGridSizer *sizer = new wxFlexGridSizer(2, 2, 10, 10);
+        sizer->Add(CORNER_WIDTH, CORNER_HEIGHT); // just a spacer
+        sizer->Add(cols, wxSizerFlags().Expand());
+        sizer->Add(rows, wxSizerFlags().Expand());
+        sizer->Add(m_canvas, wxSizerFlags().Expand());
+        sizer->AddGrowableRow(1);
+        sizer->AddGrowableCol(1);
+        SetSizer(sizer);
+
+        // this is the key call: it means that only m_canvas will be scrolled
+        // and not this window itself
+        SetTargetWindow(m_canvas);
+
+        SetScrollbars(10, 10, 50, 50);
+
+        Connect(wxEVT_SIZE, wxSizeEventHandler(MySubScrolledWindow::OnSize));
+    }
+
+protected:
+    // scrolled windows which use scroll target different from the window
+    // itself must override this virtual method
+    virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size)
     {
-        char buf[20];
-        sprintf(buf, "Item %d", i);
-        m_listCtrl->InsertItem(i, buf);
+        // decrease the total size by the size of the non-scrollable parts
+        // above/to the left of the canvas
+        wxSize sizeCanvas(size);
+        sizeCanvas.x -= 60;
+        sizeCanvas.y -= 25;
+        return sizeCanvas;
     }
-    m_listCtrl->SetItemState( 3, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED );
 
-    (void) new wxListBox( this, -1, wxPoint(260,280), wxSize(120,120), 5, choices, wxLB_ALWAYS_SB );
+private:
+    void OnSize(wxSizeEvent& WXUNUSED(event))
+    {
+        // We need to override OnSize so that our scrolled
+        // window a) does call Layout() to use sizers for
+        // positioning the controls but b) does not query
+        // the sizer for their size and use that for setting
+        // the scrollable area as set that ourselves by
+        // calling SetScrollbar() further down.
 
-    wxPanel *test = new wxPanel( this, -1, wxPoint(10, 530), wxSize(130,120), wxSIMPLE_BORDER | wxTAB_TRAVERSAL );
-    test->SetBackgroundColour( "WHEAT" );
-    wxButton *test2 = new wxButton( test, -1, "Hallo", wxPoint(10,10) );
-  
-    test = new wxPanel( this, -1, wxPoint(160, 530), wxSize(130,120), wxSUNKEN_BORDER | wxTAB_TRAVERSAL );
-    test->SetBackgroundColour( "WHEAT" );
-    test->SetCursor( wxCursor( wxCURSOR_NO_ENTRY ) );
-    test2 = new wxButton( test, -1, "Hallo", wxPoint(10,10) );
-    test2->SetCursor( wxCursor( wxCURSOR_PENCIL ) );
-  
-    test = new wxPanel( this, -1, wxPoint(310, 530), wxSize(130,120), wxRAISED_BORDER | wxTAB_TRAVERSAL );
-    test->SetBackgroundColour( "WHEAT" );
-    test->SetCursor( wxCursor( wxCURSOR_PENCIL ) );
-    test2 = new wxButton( test, -1, "Hallo", wxPoint(10,10) );
-    test2->SetCursor( wxCursor( wxCURSOR_NO_ENTRY ) );
+        Layout();
 
-    SetBackgroundColour( "WHEAT" );
-  
-    SetCursor( wxCursor( wxCURSOR_IBEAM ) );
-}
+        AdjustScrollbars();
+    }
 
-MyCanvas::~MyCanvas()
+    MySubCanvas *m_canvas;
+};
+
+class MySubFrame : public wxFrame
 {
-}
+public:
+    MySubFrame(wxWindow *parent)
+        : wxFrame(parent, wxID_ANY, "MySubScrolledWindow")
+    {
+        new MySubScrolledWindow(this);
+
+        Show();
+    }
+};
+
+// ----------------------------------------------------------------------------
+// more simple examples of wxScrolled usage
+// ----------------------------------------------------------------------------
+
+// base class for both of them
+class MyScrolledWindowBase : public wxScrolled<wxWindow>
+{
+public:
+    MyScrolledWindowBase(wxWindow *parent)
+        : wxScrolled<wxWindow>(parent, wxID_ANY,
+                               wxDefaultPosition, wxDefaultSize,
+                               wxBORDER_SUNKEN)
+    {
+        m_nLines = 50;
+        m_winSync = NULL;
+        m_inDoSync = false;
+
+        wxClientDC dc(this);
+        dc.GetTextExtent("Line 17", NULL, &m_hLine);
+    }
+
+    // this scrolled window can be synchronized with another one: if this
+    // function is called with a non-NULL pointer, the given window will be
+    // scrolled to the same position as this one
+    void SyncWith(MyScrolledWindowBase *win)
+    {
+        m_winSync = win;
+
+        DoSyncIfNecessary();
+    }
+
+    virtual void ScrollWindow(int dx, int dy, const wxRect *rect = NULL)
+    {
+        wxScrolled<wxWindow>::ScrollWindow(dx, dy, rect);
+
+        DoSyncIfNecessary();
+    }
+
+protected:
+    // the height of one line on screen
+    int m_hLine;
+
+    // the number of lines we draw
+    size_t m_nLines;
+
+private:
+    bool WasScrolledFirst() const { return m_inDoSync; }
 
-void MyCanvas::OnMouseDown( wxMouseEvent &event )
+    void DoSyncIfNecessary()
+    {
+        if ( m_winSync && !m_winSync->WasScrolledFirst() )
+        {
+            m_inDoSync = true;
+
+            m_winSync->Scroll(GetViewStart());
+
+            m_inDoSync = false;
+        }
+    }
+
+    // the window to synchronize with this one or NULL
+    MyScrolledWindowBase *m_winSync;
+
+    // the flag preventing infinite recursion which would otherwise happen if
+    // one window synchronized the other one which in turn synchronized this
+    // one and so on
+    bool m_inDoSync;
+};
+
+// this class does "stupid" redrawing - it redraws everything each time
+// and sets the scrollbar extent directly.
+
+class MyScrolledWindowDumb : public MyScrolledWindowBase
 {
-    if (event.LeftDown())
+public:
+    MyScrolledWindowDumb(wxWindow *parent) : MyScrolledWindowBase(parent)
     {
-        wxPoint pt( event.GetPosition() );
-        int x,y;
-        CalcUnscrolledPosition( pt.x, pt.y, &x, &y );
-        wxLogMessage( "Mouse down event at: %d %d, scrolled: %d %d", pt.x, pt.y, x, y );
-    }
-    
-    if (event.LeftIsDown() &&
-        event.LeftDown())
+        // no horz scrolling
+        SetScrollbars(0, m_hLine, 0, m_nLines + 1, 0, 0, true /* no refresh */);
+    }
+
+    virtual void OnDraw(wxDC& dc);
+};
+
+// this class does "smart" redrawing - only redraws the lines which must be
+// redrawn and sets the scroll rate and virtual size to affect the
+// scrollbars.
+//
+// Note that this class should produce identical results to the one above.
+
+class MyScrolledWindowSmart : public MyScrolledWindowBase
+{
+public:
+    MyScrolledWindowSmart(wxWindow *parent) : MyScrolledWindowBase(parent)
     {
-        wxLogMessage( "Error: both LeftDown() and LeftIsDown() are TRUE!" );
+        // no horz scrolling
+        SetScrollRate( 0, m_hLine );
+        SetVirtualSize( wxDefaultCoord, ( m_nLines + 1 ) * m_hLine );
     }
+
+    virtual void OnDraw(wxDC& dc);
+};
+
+// ----------------------------------------------------------------------------
+// implements a text viewer with simple block selection to test auto-scrolling
+// functionality
+// ----------------------------------------------------------------------------
+
+class MyAutoScrollingWindow : public wxScrolled<wxWindow>
+{
+public:
+    MyAutoScrollingWindow( wxWindow* parent );
+    wxRect DeviceCoordsToGraphicalChars(wxRect updRect) const;
+    wxPoint DeviceCoordsToGraphicalChars(wxPoint pos) const;
+    wxPoint GraphicalCharToDeviceCoords(wxPoint pos) const;
+    wxRect LogicalCoordsToGraphicalChars(wxRect updRect) const;
+    wxPoint LogicalCoordsToGraphicalChars(wxPoint pos) const;
+    wxPoint GraphicalCharToLogicalCoords(wxPoint pos) const;
+    void MyRefresh();
+    bool IsSelected(int chX, int chY) const;
+    static bool IsInside(int k, int bound1, int bound2);
+    static wxRect DCNormalize(int x, int y, int w, int h);
+
+private:
+    // event handlers
+    void OnDraw(wxDC& dc);
+    void OnMouseLeftDown(wxMouseEvent& event);
+    void OnMouseLeftUp(wxMouseEvent& event);
+    void OnMouseMove(wxMouseEvent& event);
+    void OnMouseCaptureLost(wxMouseCaptureLostEvent& event);
+    void OnScroll(wxScrollWinEvent& event);
+
+    // test data variables
+    static const char* sm_testData;
+    static const int sm_lineCnt; // line count
+    static const int sm_lineLen; // line length in characters
+    // sizes for graphical data
+    int m_fontH, m_fontW;
+    // selection tracking
+    wxPoint m_selStart; // beginning of blockwise selection
+    wxPoint m_cursor;   // end of blockwise selection (mouse position)
+
+    // gui stuff
+    wxFont m_font;
+
+
+    DECLARE_EVENT_TABLE()
+};
+
+class MyAutoFrame : public wxFrame
+{
+public:
+    MyAutoFrame(wxWindow *parent)
+        : wxFrame(parent, wxID_ANY, "MyAutoScrollingWindow")
+    {
+        new MyAutoScrollingWindow(this);
+
+        Show();
+    }
+};
+
+
+// ----------------------------------------------------------------------------
+// MyFrame: the main application frame showing all the classes above
+// ----------------------------------------------------------------------------
+
+class MyFrame: public wxFrame
+{
+public:
+    MyFrame();
+
+private:
+    void OnAbout(wxCommandEvent& event);
+    void OnQuit(wxCommandEvent& event);
+
+    void OnTestSimple(wxCommandEvent& WXUNUSED(event)) { new MySimpleFrame(this); }
+    void OnTestCanvas(wxCommandEvent& WXUNUSED(event)) { new MyCanvasFrame(this); }
+    void OnTestSizer(wxCommandEvent& WXUNUSED(event)) { new MySizerFrame(this); }
+    void OnTestSub(wxCommandEvent& WXUNUSED(event)) { new MySubFrame(this); }
+    void OnTestAuto(wxCommandEvent& WXUNUSED(event)) { new MyAutoFrame(this); }
+
+    void OnToggleSync(wxCommandEvent& event);
+    void OnScrollbarVisibility(wxCommandEvent& event);
+
+    MyScrolledWindowBase *m_win1,
+                         *m_win2;
+
+    DECLARE_EVENT_TABLE()
+};
+
+// ----------------------------------------------------------------------------
+// MyApp
+// ----------------------------------------------------------------------------
+
+class MyApp : public wxApp
+{
+public:
+    virtual bool OnInit();
+};
+
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// MyCanvas
+// ----------------------------------------------------------------------------
+
+const wxWindowIDRef ID_ADDBUTTON   = wxWindow::NewControlId();
+const wxWindowIDRef ID_DELBUTTON   = wxWindow::NewControlId();
+const wxWindowIDRef ID_MOVEBUTTON  = wxWindow::NewControlId();
+const wxWindowIDRef ID_SCROLLWIN   = wxWindow::NewControlId();
+const wxWindowIDRef ID_QUERYPOS    = wxWindow::NewControlId();
+
+const wxWindowIDRef ID_NEWBUTTON   = wxWindow::NewControlId();
+
+BEGIN_EVENT_TABLE(MyCanvas, wxScrolled<wxPanel>)
+    EVT_PAINT(                  MyCanvas::OnPaint)
+    EVT_RIGHT_DOWN(             MyCanvas::OnMouseRightDown)
+    EVT_MOUSEWHEEL(             MyCanvas::OnMouseWheel)
+    EVT_BUTTON( ID_QUERYPOS,    MyCanvas::OnQueryPosition)
+    EVT_BUTTON( ID_ADDBUTTON,   MyCanvas::OnAddButton)
+    EVT_BUTTON( ID_DELBUTTON,   MyCanvas::OnDeleteButton)
+    EVT_BUTTON( ID_MOVEBUTTON,  MyCanvas::OnMoveButton)
+    EVT_BUTTON( ID_SCROLLWIN,   MyCanvas::OnScrollWin)
+END_EVENT_TABLE()
+
+MyCanvas::MyCanvas(wxWindow *parent)
+    : wxScrolled<wxPanel>(parent, wxID_ANY,
+                          wxDefaultPosition, wxDefaultSize,
+                          wxSUNKEN_BORDER | wxTAB_TRAVERSAL)
+{
+    // you can use either a single SetScrollbars() call or these 2 functions,
+    // usually using them is better because you normally won't need to change
+    // the scroll rate in the future and the sizer can be used to update the
+    // virtual size automatically
+    SetScrollRate( 10, 10 );
+    SetVirtualSize( 500, 1000 );
+
+    (void) new wxButton( this, ID_ADDBUTTON,  "add button", wxPoint(10,10) );
+    (void) new wxButton( this, ID_DELBUTTON,  "del button", wxPoint(10,40) );
+    (void) new wxButton( this, ID_MOVEBUTTON, "move button", wxPoint(150,10) );
+    (void) new wxButton( this, ID_SCROLLWIN,  "scroll win", wxPoint(250,10) );
+
+    wxPanel *test = new wxPanel( this, wxID_ANY,
+                                 wxPoint(10, 110), wxSize(130,50),
+                                 wxSIMPLE_BORDER | wxTAB_TRAVERSAL );
+    test->SetBackgroundColour( "WHEAT" );
+
+    SetBackgroundColour( "BLUE" );
+}
+
+void MyCanvas::OnMouseRightDown( wxMouseEvent &event )
+{
+    wxPoint pt( event.GetPosition() );
+    int x,y;
+    CalcUnscrolledPosition( pt.x, pt.y, &x, &y );
+    wxLogMessage("Mouse down event at: %d %d, scrolled: %d %d",
+                 pt.x, pt.y, x, y);
+}
+
+void MyCanvas::OnMouseWheel( wxMouseEvent &event )
+{
+    wxPoint pt( event.GetPosition() );
+    int x,y;
+    CalcUnscrolledPosition( pt.x, pt.y, &x, &y );
+    wxLogMessage( "Mouse wheel event at: %d %d, scrolled: %d %d\n"
+                  "Rotation: %d, delta = %d",
+                  pt.x, pt.y, x, y,
+                  event.GetWheelRotation(), event.GetWheelDelta() );
+
+    event.Skip();
 }
 
 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
@@ -198,32 +723,34 @@ void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
     wxPaintDC dc( this );
     PrepareDC( dc );
 
-    dc.DrawText( "Press mouse button to test calculations!", 160, 50 );
+    dc.DrawText( "Press right mouse button to test calculations!", 160, 50 );
 
     dc.DrawText( "Some text", 140, 140 );
-  
+
     dc.DrawRectangle( 100, 160, 200, 200 );
 }
 
 void MyCanvas::OnQueryPosition( wxCommandEvent &WXUNUSED(event) )
 {
     wxPoint pt( m_button->GetPosition() );
-    wxLogMessage( "Position of ""Query position"" is %d %d", pt.x, pt.y );
+    wxLogMessage( "Position of \"Query position\" is %d %d", pt.x, pt.y );
     pt = ClientToScreen( pt );
-    wxLogMessage( "Position of ""Query position"" on screen is %d %d", pt.x, pt.y );
+    wxLogMessage("Position of \"Query position\" on screen is %d %d",
+                 pt.x, pt.y);
 }
 
 void MyCanvas::OnAddButton( wxCommandEvent &WXUNUSED(event) )
 {
     wxLogMessage( "Inserting button at position 10,70..." );
-    wxButton *button = new wxButton( this, ID_NEWBUTTON, "new button", wxPoint(10,70), wxSize(80,25) );
+    wxButton *button = new wxButton( this, ID_NEWBUTTON, "new button",
+                                     wxPoint(10,70), wxSize(80,25) );
     wxPoint pt( button->GetPosition() );
     wxLogMessage( "-> Position after inserting %d %d", pt.x, pt.y );
 }
 
-void MyCanvas::OnDeleteButton( wxCommandEvent &event )
+void MyCanvas::OnDeleteButton( wxCommandEvent &WXUNUSED(event) )
 {
-    wxLogMessage( "Deleting button inserted with ""Add button""..." );
+    wxLogMessage( "Deleting button inserted with \"Add button\"..." );
     wxWindow *win = FindWindow( ID_NEWBUTTON );
     if (win)
        win->Destroy();
@@ -237,85 +764,718 @@ void MyCanvas::OnMoveButton( wxCommandEvent &event )
     wxWindow *win = FindWindow( event.GetId() );
     wxPoint pt( win->GetPosition() );
     wxLogMessage( "-> Position before move is %d %d", pt.x, pt.y );
-    win->Move( -1, pt.y + 10 );
+    win->Move( wxDefaultCoord, pt.y + 10 );
     pt = win->GetPosition();
     wxLogMessage( "-> Position after move is %d %d", pt.x, pt.y );
 }
 
 void MyCanvas::OnScrollWin( wxCommandEvent &WXUNUSED(event) )
 {
-    wxLogMessage( "Scrolling 2 units up.\nThe white square and the controls should move equally!" );
-    int x,y;
-    ViewStart( &x, &y );
-    Scroll( -1, y+2 );
+    wxLogMessage("Scrolling 2 units up.\n"
+                 "The white square and the controls should move equally!");
+    Scroll( wxDefaultCoord, GetViewStart().y+2 );
+}
+
+// ----------------------------------------------------------------------------
+// MySizerScrolledWindow
+// ----------------------------------------------------------------------------
+
+MySizerScrolledWindow::MySizerScrolledWindow(wxWindow *parent)
+    : wxScrolled<wxWindow>(parent)
+{
+    SetBackgroundColour( "GREEN" );
+
+    // Set the rate we'd like for scrolling.
+
+    SetScrollRate( 5, 5 );
+
+    // Populate a sizer with a 'resizing' button and some other static
+    // decoration
+
+    wxFlexGridSizer *sizer = new wxFlexGridSizer(2);
+
+    m_button = new wxButton( this, wxID_RESIZE_FRAME, "Press me",
+                             wxDefaultPosition, SMALL_BUTTON );
+
+    sizer->Add(m_button, wxSizerFlags().Centre().Border(20));
+    sizer->Add(new wxStaticText(this, wxID_ANY, "This is just"),
+               wxSizerFlags().Centre());
+    sizer->Add(new wxStaticText(this, wxID_ANY, "some decoration"),
+               wxSizerFlags().Centre());
+    sizer->Add(new wxStaticText(this, wxID_ANY, "for you to scroll..."),
+               wxSizerFlags().Centre());
+
+    // Then use the sizer to set the scrolled region size.
+
+    SetSizer( sizer );
+
+    Connect(wxID_RESIZE_FRAME, wxEVT_COMMAND_BUTTON_CLICKED,
+            wxCommandEventHandler(MySizerScrolledWindow::OnResizeClick));
+}
+
+void MySizerScrolledWindow::OnResizeClick(wxCommandEvent &WXUNUSED(event))
+{
+    // Arbitrarily resize the button to change the minimum size of
+    // the (scrolled) sizer.
+
+    if ( m_button->GetSize() == SMALL_BUTTON )
+        m_button->SetSizeHints(LARGE_BUTTON);
+    else
+        m_button->SetSizeHints(SMALL_BUTTON);
+
+    // Force update layout and scrollbars, since nothing we do here
+    // necessarily generates a size event which would do it for us.
+    FitInside();
 }
 
+// ----------------------------------------------------------------------------
 // MyFrame
+// ----------------------------------------------------------------------------
 
-const int ID_QUIT  = 108;
-const int ID_ABOUT = 109;
+const wxWindowID Scroll_Test_Simple = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Canvas = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Sizers = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Sub    = wxWindow::NewControlId();
+const wxWindowID Scroll_Test_Auto   = wxWindow::NewControlId();
 
-IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
+const wxWindowID Scroll_TglBtn_Sync = wxWindow::NewControlId();
+const wxWindowID Scroll_Radio_ShowScrollbar = wxWindow::NewControlId();
 
 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
-  EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
-  EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
+    EVT_MENU(wxID_ABOUT, MyFrame::OnAbout)
+    EVT_MENU(wxID_EXIT,  MyFrame::OnQuit)
+
+    EVT_MENU(Scroll_Test_Simple, MyFrame::OnTestSimple)
+    EVT_MENU(Scroll_Test_Canvas, MyFrame::OnTestCanvas)
+    EVT_MENU(Scroll_Test_Sizers, MyFrame::OnTestSizer)
+    EVT_MENU(Scroll_Test_Sub, MyFrame::OnTestSub)
+    EVT_MENU(Scroll_Test_Auto, MyFrame::OnTestAuto)
+
+    EVT_TOGGLEBUTTON(Scroll_TglBtn_Sync, MyFrame::OnToggleSync)
+    EVT_RADIOBOX(Scroll_Radio_ShowScrollbar, MyFrame::OnScrollbarVisibility)
 END_EVENT_TABLE()
 
 MyFrame::MyFrame()
-       : wxFrame( (wxFrame *)NULL, -1, "wxScrolledWindow sample",
-                  wxPoint(20,20), wxSize(470,500) )
+       : wxFrame(NULL, wxID_ANY, "wxWidgets scroll sample")
 {
-    wxMenu *file_menu = new wxMenu();
-    file_menu->Append( ID_ABOUT, "&About..");
-    file_menu->Append( ID_QUIT, "E&xit\tAlt-X");
+    SetIcon(wxICON(sample));
+
+    wxMenu *menuFile = new wxMenu;
+    menuFile->Append(wxID_ABOUT, "&About..");
+    menuFile->AppendSeparator();
+    menuFile->Append(wxID_EXIT, "E&xit\tAlt-X");
+
+    wxMenu *menuTest = new wxMenu;
+    menuTest->Append(Scroll_Test_Simple, "&Simple scroll window\tF1",
+                     "Simplest possible scrolled window test.");
+    menuTest->Append(Scroll_Test_Canvas, "Scrolled window with &children\tF2",
+                     "Scrolled window with controls on it.");
+    menuTest->Append(Scroll_Test_Sizers, "Scrolled window with si&zer\tF3",
+                     "Scrolled window with children managed by sizer.");
+    menuTest->Append(Scroll_Test_Sub, "Scrolled s&ub-window\tF4",
+                     "Window only part of which is scrolled.");
+    menuTest->Append(Scroll_Test_Auto, "&Auto-scrolled window\tF5",
+                     "Window which scrolls when the mouse is held pressed "
+                     "outside of it.");
+
+    wxMenuBar *mbar = new wxMenuBar;
+    mbar->Append(menuFile, "&File");
+    mbar->Append(menuTest, "&Test");
+
+    SetMenuBar( mbar );
+
+
+    wxPanel *panel = new wxPanel(this);
+
+    const wxSizerFlags flagsExpand(wxSizerFlags(1).Expand());
+
+    wxSizer *topsizer = new wxBoxSizer(wxVERTICAL);
+    topsizer->Add(new wxStaticText(panel, wxID_ANY,
+        "The windows below should behave in the same way, even though\n"
+        "they're implemented quite differently, see the code for details.\n"
+        "\n"
+        "The lines redrawn during odd/even repaint iterations are drawn in\n"
+        "red/blue colour to allow seeing immediately how much is repainted,\n"
+        "don't be surprised by this."),
+        wxSizerFlags().Centre().Border());
+
+    m_win1 = new MyScrolledWindowDumb(panel);
+    m_win2 = new MyScrolledWindowSmart(panel);
+
+    wxSizer *sizerScrollWin = new wxBoxSizer(wxHORIZONTAL);
+    sizerScrollWin->Add(m_win1, flagsExpand);
+    sizerScrollWin->Add(m_win2, flagsExpand);
+    topsizer->Add(sizerScrollWin, flagsExpand);
 
-    wxMenuBar *menu_bar = new wxMenuBar();
-    menu_bar->Append(file_menu, "&File");
+    const wxSizerFlags
+        flagsHBorder(wxSizerFlags().Centre().Border(wxLEFT | wxRIGHT));
 
-    SetMenuBar( menu_bar );
+    wxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
 
-    CreateStatusBar(2);
-    int widths[] = { -1, 100 };
-    SetStatusWidths( 2, widths );
+    // the radio buttons are in the same order as wxSHOW_SB_XXX values but
+    // offset by 1
+    const wxString visibilities[] = { "&never", "&default", "&always" };
+    wxRadioBox *radio = new wxRadioBox(panel, Scroll_Radio_ShowScrollbar,
+                                       "Left &scrollbar visibility: ",
+                                       wxDefaultPosition, wxDefaultSize,
+                                       WXSIZEOF(visibilities), visibilities);
+    radio->SetSelection(wxSHOW_SB_DEFAULT + 1);
+    sizerBtns->Add(radio, flagsHBorder);
 
-    m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(100,100) );
-    m_canvas->SetScrollbars( 10, 10, 50, 100 );
-  
-    m_log = new wxTextCtrl( this, -1, "This is the log window.\n", wxPoint(0,0), wxSize(100,100), wxTE_MULTILINE );
-    wxLog *old_log = wxLog::SetActiveTarget( new wxLogTextCtrl( m_log ) );
-    delete old_log;
-    
-    wxBoxSizer *topsizer = new wxBoxSizer( wxVERTICAL );
-    
-    topsizer->Add( m_canvas, 1, wxEXPAND );
-    topsizer->Add( m_log, 0, wxEXPAND );
+    sizerBtns->Add(new wxToggleButton(panel, Scroll_TglBtn_Sync, "S&ynchronize"),
+                   flagsHBorder);
 
-    SetAutoLayout( TRUE );
-    SetSizer( topsizer );
+    topsizer->Add(sizerBtns, wxSizerFlags().Centre().Border());
+
+    panel->SetSizer(topsizer);
+
+    wxSize size = panel->GetBestSize();
+    SetSizeHints(size);
+    SetClientSize(2*size);
+
+    Show();
+}
+
+void MyFrame::OnToggleSync(wxCommandEvent& event)
+{
+    if ( event.IsChecked() )
+    {
+        m_win1->SyncWith(m_win2);
+        m_win2->SyncWith(m_win1);
+    }
+    else
+    {
+        m_win1->SyncWith(NULL);
+        m_win2->SyncWith(NULL);
+    }
 }
 
-void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
+void MyFrame::OnScrollbarVisibility(wxCommandEvent& event)
 {
-  Close( TRUE );
+    m_win1->ShowScrollbars(wxSHOW_SB_NEVER,
+                           wxScrollbarVisibility(event.GetSelection() - 1));
+}
+
+void MyFrame::OnQuit(wxCommandEvent &WXUNUSED(event))
+{
+    Close(true);
 }
 
 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 {
-  (void)wxMessageBox( "wxScroll demo\n"
-                      "Robert Roebling (c) 1998",
-                      "About wxScroll Demo", wxICON_INFORMATION | wxOK );
+    (void)wxMessageBox( "Scrolled window sample\n"
+                        "\n"
+                        "Robert Roebling (c) 1998\n"
+                        "Vadim Zeitlin (c) 2008\n"
+                        "Autoscrolling examples\n"
+                        "Ron Lee (c) 2002\n"
+                        "Auto-timed-scrolling example\n"
+                        "Matt Gregory (c) 2003\n",
+                        "About wxWidgets scroll sample",
+                        wxICON_INFORMATION | wxOK );
 }
 
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 // MyApp
-//-----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+
+IMPLEMENT_APP(MyApp)
 
 bool MyApp::OnInit()
 {
-  wxFrame *frame = new MyFrame();
-  frame->Show( TRUE );
+    if ( !wxApp::OnInit() )
+        return false;
+
+    new MyFrame();
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// MyScrolledWindowXXX
+// ----------------------------------------------------------------------------
+
+void MyScrolledWindowDumb::OnDraw(wxDC& dc)
+{
+    // this is useful to see which lines are redrawn
+    static size_t s_redrawCount = 0;
+    dc.SetTextForeground(s_redrawCount++ % 2 ? *wxRED : *wxBLUE);
+
+    int y = 0;
+    for ( size_t line = 0; line < m_nLines; line++ )
+    {
+        int yPhys;
+        CalcScrolledPosition(0, y, NULL, &yPhys);
+
+        dc.DrawText(wxString::Format("Line %u (logical %d, physical %d)",
+                                     unsigned(line), y, yPhys), 0, y);
+        y += m_hLine;
+    }
+}
+
+void MyScrolledWindowSmart::OnDraw(wxDC& dc)
+{
+    // this is useful to see which lines are redrawn
+    static size_t s_redrawCount = 0;
+    dc.SetTextForeground(s_redrawCount++ % 2 ? *wxRED : *wxBLUE);
+
+    // update region is always in device coords, translate to logical ones
+    wxRect rectUpdate = GetUpdateRegion().GetBox();
+    CalcUnscrolledPosition(rectUpdate.x, rectUpdate.y,
+                           &rectUpdate.x, &rectUpdate.y);
+
+    size_t lineFrom = rectUpdate.y / m_hLine,
+           lineTo = rectUpdate.GetBottom() / m_hLine;
+
+    if ( lineTo > m_nLines - 1)
+        lineTo = m_nLines - 1;
+
+    int y = lineFrom*m_hLine;
+    for ( size_t line = lineFrom; line <= lineTo; line++ )
+    {
+        int yPhys;
+        CalcScrolledPosition(0, y, NULL, &yPhys);
+
+        dc.DrawText(wxString::Format("Line %u (logical %d, physical %d)",
+                                     unsigned(line), y, yPhys), 0, y);
+        y += m_hLine;
+    }
+}
+
+// ----------------------------------------------------------------------------
+// MyAutoScrollingWindow
+// ----------------------------------------------------------------------------
+
+BEGIN_EVENT_TABLE(MyAutoScrollingWindow, wxScrolled<wxWindow>)
+    EVT_LEFT_DOWN(MyAutoScrollingWindow::OnMouseLeftDown)
+    EVT_LEFT_UP(MyAutoScrollingWindow::OnMouseLeftUp)
+    EVT_MOTION(MyAutoScrollingWindow::OnMouseMove)
+    EVT_MOUSE_CAPTURE_LOST(MyAutoScrollingWindow::OnMouseCaptureLost)
+    EVT_SCROLLWIN(MyAutoScrollingWindow::OnScroll)
+END_EVENT_TABLE()
+
+MyAutoScrollingWindow::MyAutoScrollingWindow(wxWindow* parent)
+    : wxScrolled<wxWindow>(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
+                           wxVSCROLL | wxHSCROLL | wxSUNKEN_BORDER),
+      m_selStart(-1, -1),
+      m_cursor(-1, -1),
+      m_font(9, wxFONTFAMILY_TELETYPE, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL)
+{
+    wxClientDC dc(this);
+    // query dc for text size
+    dc.SetFont(m_font);
+    dc.GetTextExtent(wxString("A"), &m_fontW, &m_fontH);
+    // set up the virtual window
+    SetScrollbars(m_fontW, m_fontH, sm_lineLen, sm_lineCnt);
+}
+
+wxRect
+MyAutoScrollingWindow::DeviceCoordsToGraphicalChars(wxRect updRect) const
+{
+    wxPoint pos(updRect.GetPosition());
+    pos = DeviceCoordsToGraphicalChars(pos);
+    updRect.x = pos.x;
+    updRect.y = pos.y;
+    updRect.width /= m_fontW;
+    updRect.height /= m_fontH;
+    // the *CoordsToGraphicalChars() funcs round down to upper-left corner,
+    //   so an off-by-one correction is needed
+    ++updRect.width; // kludge
+    ++updRect.height; // kludge
+    return updRect;
+}
 
-  return TRUE;
+wxPoint
+MyAutoScrollingWindow::DeviceCoordsToGraphicalChars(wxPoint pos) const
+{
+    pos.x /= m_fontW;
+    pos.y /= m_fontH;
+    pos += GetViewStart();
+    return pos;
+}
+
+wxPoint
+MyAutoScrollingWindow::GraphicalCharToDeviceCoords(wxPoint pos) const
+{
+    pos -= GetViewStart();
+    pos.x *= m_fontW;
+    pos.y *= m_fontH;
+    return pos;
+}
+
+wxRect
+MyAutoScrollingWindow::LogicalCoordsToGraphicalChars(wxRect updRect) const
+{
+    wxPoint pos(updRect.GetPosition());
+    pos = LogicalCoordsToGraphicalChars(pos);
+    updRect.x = pos.x;
+    updRect.y = pos.y;
+    updRect.width /= m_fontW;
+    updRect.height /= m_fontH;
+    // the *CoordsToGraphicalChars() funcs round down to upper-left corner,
+    //   so an off-by-one correction is needed
+    ++updRect.width; // kludge
+    ++updRect.height; // kludge
+    return updRect;
+}
+
+wxPoint
+MyAutoScrollingWindow::LogicalCoordsToGraphicalChars(wxPoint pos) const
+{
+    pos.x /= m_fontW;
+    pos.y /= m_fontH;
+    return pos;
+}
+
+wxPoint
+MyAutoScrollingWindow::GraphicalCharToLogicalCoords(wxPoint pos) const
+{
+    pos.x *= m_fontW;
+    pos.y *= m_fontH;
+    return pos;
+}
+
+void MyAutoScrollingWindow::MyRefresh()
+{
+    static wxPoint lastSelStart(-1, -1), lastCursor(-1, -1);
+    // refresh last selected area (to deselect previously selected text)
+    wxRect lastUpdRect(
+            GraphicalCharToDeviceCoords(lastSelStart),
+            GraphicalCharToDeviceCoords(lastCursor)
+        );
+    // off-by-one corrections, necessary because it's not possible to know
+    //   when to round up until rect is normalized by lastUpdRect constructor
+    lastUpdRect.width += m_fontW; // kludge
+    lastUpdRect.height += m_fontH; // kludge
+    // refresh currently selected (to select previously unselected text)
+    wxRect updRect(
+            GraphicalCharToDeviceCoords(m_selStart),
+            GraphicalCharToDeviceCoords(m_cursor)
+        );
+    // off-by-one corrections
+    updRect.width += m_fontW; // kludge
+    updRect.height += m_fontH; // kludge
+    // find necessary refresh areas
+    int rx = lastUpdRect.x;
+    int ry = lastUpdRect.y;
+    int rw = updRect.x - lastUpdRect.x;
+    int rh = lastUpdRect.height;
+    if (rw && rh) {
+        RefreshRect(DCNormalize(rx, ry, rw, rh));
+    }
+    rx = updRect.x;
+    ry = updRect.y + updRect.height;
+    rw= updRect.width;
+    rh = (lastUpdRect.y + lastUpdRect.height) - (updRect.y + updRect.height);
+    if (rw && rh) {
+        RefreshRect(DCNormalize(rx, ry, rw, rh));
+    }
+    rx = updRect.x + updRect.width;
+    ry = lastUpdRect.y;
+    rw = (lastUpdRect.x + lastUpdRect.width) - (updRect.x + updRect.width);
+    rh = lastUpdRect.height;
+    if (rw && rh) {
+        RefreshRect(DCNormalize(rx, ry, rw, rh));
+    }
+    rx = updRect.x;
+    ry = lastUpdRect.y;
+    rw = updRect.width;
+    rh = updRect.y - lastUpdRect.y;
+    if (rw && rh) {
+        RefreshRect(DCNormalize(rx, ry, rw, rh));
+    }
+    // update last
+    lastSelStart = m_selStart;
+    lastCursor = m_cursor;
+}
+
+bool MyAutoScrollingWindow::IsSelected(int chX, int chY) const
+{
+    if (IsInside(chX, m_selStart.x, m_cursor.x)
+            && IsInside(chY, m_selStart.y, m_cursor.y)) {
+        return true;
+    }
+    return false;
+}
+
+bool MyAutoScrollingWindow::IsInside(int k, int bound1, int bound2)
+{
+    if ((k >= bound1 && k <= bound2) || (k >= bound2 && k <= bound1)) {
+        return true;
+    }
+    return false;
+}
+
+wxRect
+MyAutoScrollingWindow::DCNormalize(int x, int y, int w, int h)
+{
+    // this is needed to get rid of the graphical remnants from the selection
+    // I think it's because DrawRectangle() excludes a pixel in either direction
+    const int kludge = 1;
+    // make (x, y) the top-left corner
+    if (w < 0) {
+        w = -w + kludge;
+        x -= w;
+    } else {
+        x -= kludge;
+        w += kludge;
+    }
+    if (h < 0) {
+        h = -h + kludge;
+        y -= h;
+    } else {
+        y -= kludge;
+        h += kludge;
+    }
+    return wxRect(x, y, w, h);
+}
+
+void MyAutoScrollingWindow::OnDraw(wxDC& dc)
+{
+    dc.SetFont(m_font);
+    wxBrush normBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW)
+            , wxSOLID);
+    wxBrush selBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT)
+            , wxSOLID);
+    dc.SetPen(*wxTRANSPARENT_PEN);
+    const wxString str = sm_testData;
+    size_t strLength = str.length();
+    wxString::const_iterator str_i = str.begin();
+
+    // draw the characters
+    // 1. for each update region
+    for (wxRegionIterator upd(GetUpdateRegion()); upd; ++upd) {
+        wxRect updRect = upd.GetRect();
+        wxRect updRectInGChars(DeviceCoordsToGraphicalChars(updRect));
+        // 2. for each row of chars in the update region
+        for (int chY = updRectInGChars.y
+                ; chY <= updRectInGChars.y + updRectInGChars.height; ++chY) {
+            // 3. for each character in the row
+            bool isFirstX = true;
+            for (int chX = updRectInGChars.x
+                    ; chX <= updRectInGChars.x + updRectInGChars.width
+                    ; ++chX) {
+                // 4. set up dc
+                if (IsSelected(chX, chY)) {
+                    dc.SetBrush(selBrush);
+                    dc.SetTextForeground( wxSystemSettings::GetColour
+                            (wxSYS_COLOUR_HIGHLIGHTTEXT));
+                } else {
+                    dc.SetBrush(normBrush);
+                    dc.SetTextForeground( wxSystemSettings::GetColour
+                            (wxSYS_COLOUR_WINDOWTEXT));
+                }
+                // 5. find position info
+                wxPoint charPos = GraphicalCharToLogicalCoords(wxPoint
+                        (chX, chY));
+                // 6. draw!
+                dc.DrawRectangle(charPos.x, charPos.y, m_fontW, m_fontH);
+                size_t charIndex = chY * sm_lineLen + chX;
+                if (chY < sm_lineCnt &&
+                    chX < sm_lineLen &&
+                    charIndex < strLength)
+                {
+                    if (isFirstX)
+                    {
+                        str_i = str.begin() + charIndex;
+                        isFirstX = false;
+                    }
+                    dc.DrawText(*str_i, charPos.x, charPos.y);
+                    ++str_i;
+                }
+            }
+        }
+    }
+}
+
+void MyAutoScrollingWindow::OnMouseLeftDown(wxMouseEvent& event)
+{
+    // initial press of mouse button sets the beginning of the selection
+    m_selStart = DeviceCoordsToGraphicalChars(event.GetPosition());
+    // set the cursor to the same position
+    m_cursor = m_selStart;
+    // draw/erase selection
+    MyRefresh();
+}
+
+void MyAutoScrollingWindow::OnMouseLeftUp(wxMouseEvent& WXUNUSED(event))
+{
+    // this test is necessary
+    if (HasCapture()) {
+        // uncapture mouse
+        ReleaseMouse();
+    }
+}
+
+void MyAutoScrollingWindow::OnMouseMove(wxMouseEvent& event)
+{
+    // if user is dragging
+    if (event.Dragging() && event.LeftIsDown()) {
+        // set the new cursor position
+        m_cursor = DeviceCoordsToGraphicalChars(event.GetPosition());
+        // draw/erase selection
+        MyRefresh();
+        // capture mouse to activate auto-scrolling
+        if (!HasCapture()) {
+            CaptureMouse();
+        }
+    }
+}
+
+void
+MyAutoScrollingWindow::OnMouseCaptureLost(wxMouseCaptureLostEvent&
+                                                WXUNUSED(event))
+{
+    // we only capture mouse for timed scrolling, so nothing is needed here
+    // other than making sure to not call event.Skip()
+}
+
+void MyAutoScrollingWindow::OnScroll(wxScrollWinEvent& event)
+{
+    // need to move the cursor when autoscrolling
+    // FIXME: the cursor also moves when the scrollbar arrows are clicked
+    if (HasCapture()) {
+        if (event.GetOrientation() == wxHORIZONTAL) {
+            if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP) {
+                --m_cursor.x;
+            } else if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN) {
+                ++m_cursor.x;
+            }
+        } else if (event.GetOrientation() == wxVERTICAL) {
+            if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP) {
+                --m_cursor.y;
+            } else if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN) {
+                ++m_cursor.y;
+            }
+        }
+    }
+    MyRefresh();
+    event.Skip();
 }
 
+const int MyAutoScrollingWindow::sm_lineCnt = 125;
+const int MyAutoScrollingWindow::sm_lineLen = 79;
+const char *MyAutoScrollingWindow::sm_testData =
+"162 Cult of the genius out of vanity. Because we think well of ourselves, but "
+"nonetheless never suppose ourselves capable of producing a painting like one of "
+"Raphael's or a dramatic scene like one of Shakespeare's, we convince ourselves "
+"that the capacity to do so is quite extraordinarily marvelous, a wholly "
+"uncommon accident, or, if we are still religiously inclined, a mercy from on "
+"high. Thus our vanity, our self-love, promotes the cult of the genius: for only "
+"if we think of him as being very remote from us, as a miraculum, does he not "
+"aggrieve us (even Goethe, who was without envy, called Shakespeare his star of "
+"the most distant heights [\"William! Stern der schonsten Ferne\": from Goethe's, "
+"\"Between Two Worlds\"]; in regard to which one might recall the lines: \"the "
+"stars, these we do not desire\" [from Goethe's, \"Comfort in Tears\"]). But, aside "
+"from these suggestions of our vanity, the activity of the genius seems in no "
+"way fundamentally different from the activity of the inventor of machines, the "
+"scholar of astronomy or history, the master of tactics. All these activities "
+"are explicable if one pictures to oneself people whose thinking is active in "
+"one direction, who employ everything as material, who always zealously observe "
+"their own inner life and that of others, who perceive everywhere models and "
+"incentives, who never tire of combining together the means available to them. "
+"Genius too does nothing except learn first how to lay bricks then how to build, "
+"except continually seek for material and continually form itself around it. "
+"Every activity of man is amazingly complicated, not only that of the genius: "
+"but none is a \"miracle.\" Whence, then, the belief that genius exists only in "
+"the artist, orator and philosopher? that only they have \"intuition\"? (Whereby "
+"they are supposed to possess a kind of miraculous eyeglass with which they can "
+"see directly into \"the essence of the thing\"!) It is clear that people speak of "
+"genius only where the effects of the great intellect are most pleasant to them "
+"and where they have no desire to feel envious. To call someone \"divine\" means: "
+"\"here there is no need for us to compete.\" Then, everything finished and "
+"complete is regarded with admiration, everything still becoming is undervalued. "
+"But no one can see in the work of the artist how it has become; that is its "
+"advantage, for wherever one can see the act of becoming one grows somewhat "
+"cool. The finished and perfect art of representation repulses all thinking as "
+"to how it has become; it tyrannizes as present completeness and perfection. "
+"That is why the masters of the art of representation count above all as gifted "
+"with genius and why men of science do not. In reality, this evaluation of the "
+"former and undervaluation of the latter is only a piece of childishness in the "
+"realm of reason. "
+"\n\n"
+"163 The serious workman. Do not talk about giftedness, inborn talents! One can "
+"name great men of all kinds who were very little gifted. The acquired "
+"greatness, became \"geniuses\" (as we put it), through qualities the lack of "
+"which no one who knew what they were would boast of: they all possessed that "
+"seriousness of the efficient workman which first learns to construct the parts "
+"properly before it ventures to fashion a great whole; they allowed themselves "
+"time for it, because they took more pleasure in making the little, secondary "
+"things well than in the effect of a dazzling whole. the recipe for becoming a "
+"good novelist, for example, is easy to give, but to carry it out presupposes "
+"qualities one is accustomed to overlook when one says \"I do not have enough "
+"talent.\" One has only to make a hundred or so sketches for novels, none longer "
+"than two pages but of such distinctness that every word in them is necessary; "
+"one should write down anecdotes each day until one has learned how to give them "
+"the most pregnant and effective form; one should be tireless in collecting and "
+"describing human types and characters; one should above all relate things to "
+"others and listen to others relate, keeping one's eyes and ears open for the "
+"effect produced on those present, one should travel like a landscape painter or "
+"costume designer; one should excerpt for oneself out of the individual sciences "
+"everything that will produce an artistic effect when it is well described, one "
+"should, finally, reflect on the motives of human actions, disdain no signpost "
+"to instruction about them and be a collector of these things by day and night. "
+"One should continue in this many-sided exercise some ten years: what is then "
+"created in the workshop, however, will be fit to go out into the world. What, "
+"however, do most people do? They begin, not with the parts, but with the whole. "
+"Perhaps they chance to strike a right note, excite attention and from then on "
+"strike worse and worse notes, for good, natural reasons. Sometimes, when the "
+"character and intellect needed to formulate such a life-plan are lacking, fate "
+"and need take their place and lead the future master step by step through all "
+"the stipulations of his trade. "
+"\n\n"
+"164 Peril and profit in the cult of the genius. The belief in great, superior, "
+"fruitful spirits is not necessarily, yet nonetheless is very frequently "
+"associated with that religious or semi-religious superstition that these "
+"spirits are of supra-human origin and possess certain miraculous abilities by "
+"virtue of which they acquire their knowledge by quite other means than the rest "
+"of mankind. One ascribes to them, it seems, a direct view of the nature of the "
+"world, as it were a hole in the cloak of appearance, and believes that, by "
+"virtue of this miraculous seer's vision, they are able to communicate something "
+"conclusive and decisive about man and the world without the toil and "
+"rigorousness required by science. As long as there continue to be those who "
+"believe in the miraculous in the domain of knowledge one can perhaps concede "
+"that these people themselves derive some benefit from their belief, inasmuch as "
+"through their unconditional subjection to the great spirits they create for "
+"their own spirit during its time of development the finest form of discipline "
+"and schooling. On the other hand, it is at least questionable whether the "
+"superstitious belief in genius, in its privileges and special abilities, is of "
+"benefit to the genius himself if it takes root in him. It is in any event a "
+"dangerous sign when a man is assailed by awe of himself, whether it be the "
+"celebrated Caesar's awe of Caesar or the awe of one's own genius now under "
+"consideration; when the sacrificial incense which is properly rendered only to "
+"a god penetrates the brain of the genius, so that his head begins to swim and "
+"he comes to regard himself as something supra-human. The consequences that "
+"slowly result are: the feeling of irresponsibility, of exceptional rights, the "
+"belief that he confers a favor by his mere presence, insane rage when anyone "
+"attempts even to compare him with others, let alone to rate him beneath them, "
+"or to draw attention to lapses in his work. Because he ceases to practice "
+"criticism of himself, at last one pinion after the other falls out of his "
+"plumage: that superstitious eats at the roots of his powers and perhaps even "
+"turns him into a hypocrite after his powers have fled from him. For the great "
+"spirits themselves it is therefore probably more beneficial if they acquire an "
+"insight into the nature and origin of their powers, if they grasp, that is to "
+"say, what purely human qualities have come together in them and what fortunate "
+"circumstances attended them: in the first place undiminished energy, resolute "
+"application to individual goals, great personal courage, then the good fortune "
+"to receive an upbringing which offered in the early years the finest teachers, "
+"models and methods. To be sure, when their goal is the production of the "
+"greatest possible effect, unclarity with regard to oneself and that "
+"semi-insanity superadded to it has always achieved much; for what has been "
+"admired and envied at all times has been that power in them by virtue of which "
+"they render men will-less and sweep them away into the delusion that the "
+"leaders they are following are supra-natural. Indeed, it elevates and inspires "
+"men to believe that someone is in possession of supra-natural powers: to this "
+"extent Plato was right to say [Plato: Phaedrus, 244a] that madness has brought "
+"the greatest of blessings upon mankind. In rare individual cases this portion "
+"of madness may, indeed, actually have been the means by which such a nature, "
+"excessive in all directions, was held firmly together: in the life of "
+"individuals, too, illusions that are in themselves poisons often play the role "
+"of healers; yet, in the end, in the case of every \"genius\" who believes in his "
+"own divinity the poison shows itself to the same degree as his \"genius\" grows "
+"old: one may recall, for example, the case of Napoleon, whose nature certainly "
+"grew into the mighty unity that sets him apart from all men of modern times "
+"precisely through his belief in himself and his star and through the contempt "
+"for men that flowed from it; until in the end, however, this same belief went "
+"over into an almost insane fatalism, robbed him of his acuteness and swiftness "
+"of perception, and became the cause of his destruction.";