/*
 * Program: scrollsub
 *
 * Author: Robert Roebling
 *
 * Copyright: (C) 1999, Robert Roebling
 *
 */

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "wx/image.h"
#include "wx/listctrl.h"
#include "wx/sizer.h"
#include "wx/log.h"


// derived classes

class MyFrame;
class MyScrolledWindow;
class MyCanvas;
class MyApp;

// MyScrolledWindow

class MyScrolledWindow: public wxScrolledWindow
{
public:
    MyScrolledWindow(){};
    MyScrolledWindow( wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size );
    ~MyScrolledWindow(){};
    void OnPaint( wxPaintEvent &event );
    void OnSize( wxSizeEvent &event );
private:
    MyCanvas    *m_canvas;

    DECLARE_DYNAMIC_CLASS(MyScrolledWindow)
    DECLARE_EVENT_TABLE()
};

// MyTopLabels

class MyTopLabels: public wxWindow
{
public:
    MyTopLabels() {}
    MyTopLabels( wxScrolledWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size );

    void OnPaint( wxPaintEvent &event );

private:
    wxScrolledWindow   *m_owner;

    DECLARE_DYNAMIC_CLASS(MyTopLabels)
    DECLARE_EVENT_TABLE()
};

// MyRightLabels

class MyRightLabels: public wxWindow
{
public:
    MyRightLabels() {}
    MyRightLabels( wxScrolledWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size );

    void OnPaint( wxPaintEvent &event );

private:
    wxScrolledWindow   *m_owner;

    DECLARE_DYNAMIC_CLASS(MyRightLabels)
    DECLARE_EVENT_TABLE()
};

// MyCanvas

class MyCanvas: public wxPanel
{
public:
    MyCanvas(){};
    MyCanvas( wxScrolledWindow *parent, MyTopLabels *top, MyRightLabels *right,
              wxWindowID id, const wxPoint &pos, const wxSize &size );
    ~MyCanvas(){};
    void OnPaint( wxPaintEvent &event );
    void ScrollWindow( int dx, int dy, const wxRect *rect );

private:
    wxScrolledWindow   *m_owner;
    MyTopLabels        *m_topLabels;
    MyRightLabels      *m_rightLabels;

    DECLARE_DYNAMIC_CLASS(MyCanvas)
    DECLARE_EVENT_TABLE()
};

// MyFrame

class MyFrame: public wxFrame
{
public:
    MyFrame();

    void OnAbout( wxCommandEvent &event );
    void OnQuit( wxCommandEvent &event );
    void OnFullScreen( wxCommandEvent &event );

    wxScrolledWindow   *m_scrolled;
#if wxUSE_LOG
    wxTextCtrl         *m_log;
#endif // wxUSE_LOG

private:
    DECLARE_DYNAMIC_CLASS(MyFrame)
    DECLARE_EVENT_TABLE()
};

// MyApp

class MyApp: public wxApp
{
public:
    virtual bool OnInit();
};

// main program

IMPLEMENT_APP(MyApp)

// MyScrolledWindow

IMPLEMENT_DYNAMIC_CLASS(MyScrolledWindow, wxScrolledWindow)

BEGIN_EVENT_TABLE(MyScrolledWindow, wxScrolledWindow)
  EVT_PAINT(      MyScrolledWindow::OnPaint)
  EVT_SIZE(       MyScrolledWindow::OnSize)
END_EVENT_TABLE()

MyScrolledWindow::MyScrolledWindow( wxWindow *parent, wxWindowID id,
                    const wxPoint &pos, const wxSize &size )
        : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER, _T("test canvas") )
{
    MyTopLabels *top = new MyTopLabels( this, wxID_ANY, wxDefaultPosition, wxSize(wxDefaultCoord,25) );
    MyRightLabels *right = new MyRightLabels( this, wxID_ANY, wxDefaultPosition, wxSize(60,wxDefaultCoord) );

    m_canvas = new MyCanvas( this, top, right, wxID_ANY, wxDefaultPosition, wxDefaultSize );

    SetTargetWindow( m_canvas );

    SetBackgroundColour( wxT("WHEAT") );

    SetCursor( wxCursor( wxCURSOR_HAND ) );

    wxBoxSizer *mainsizer = new wxBoxSizer( wxVERTICAL );

    wxBoxSizer *topsizer = new wxBoxSizer( wxHORIZONTAL );
    topsizer->Add( 60,25 );
    topsizer->Add( top, 1, wxEXPAND );

    mainsizer->Add( topsizer, 0, wxEXPAND );

    wxBoxSizer *middlesizer = new wxBoxSizer( wxHORIZONTAL );
    middlesizer->Add( right, 0, wxEXPAND );
    middlesizer->Add( m_canvas, 1, wxEXPAND );

    mainsizer->Add( middlesizer, 1, wxEXPAND );

    SetAutoLayout( true );
    SetSizer( mainsizer );
}

void MyScrolledWindow::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.

    Layout();

    AdjustScrollbars();
}

void MyScrolledWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
    wxPaintDC dc( this );

/*
    wxSize size( GetClientSize() );

    long w,h;
    dc.GetTextExtent( wxT("Headline"), &w, &h );

    dc.DrawText( wxT("Headline"), long (size.x / 2 - w / 2), 10 );
*/
}

// MyTopLabels

IMPLEMENT_DYNAMIC_CLASS(MyTopLabels,wxWindow)

BEGIN_EVENT_TABLE(MyTopLabels, wxWindow)
  EVT_PAINT(      MyTopLabels::OnPaint)
END_EVENT_TABLE()

MyTopLabels::MyTopLabels( wxScrolledWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size )
  : wxWindow( parent, id, pos, size )
{
    m_owner = parent;
}

void MyTopLabels::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( _T("Column 1"), 5, 5 );
    dc.DrawText( _T("Column 2"), 105, 5 );
    dc.DrawText( _T("Column 3"), 205, 5 );
}

// MyRightLabels

IMPLEMENT_DYNAMIC_CLASS(MyRightLabels,wxWindow)

BEGIN_EVENT_TABLE(MyRightLabels, wxWindow)
  EVT_PAINT(      MyRightLabels::OnPaint)
END_EVENT_TABLE()

MyRightLabels::MyRightLabels( wxScrolledWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size )
  : wxWindow( parent, id, pos, size )
{
    m_owner = parent;
}

void MyRightLabels::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 yScrollUnits, yOrigin;

    m_owner->GetViewStart( 0, &yOrigin );
    m_owner->GetScrollPixelsPerUnit( 0, &yScrollUnits );
    dc.SetDeviceOrigin( 0, -yOrigin * yScrollUnits );

    dc.DrawText( _T("Row 1"), 5, 5 );
    dc.DrawText( _T("Row 2"), 5, 30 );
    dc.DrawText( _T("Row 3"), 5, 55 );
    dc.DrawText( _T("Row 4"), 5, 80 );
    dc.DrawText( _T("Row 5"), 5, 105 );
    dc.DrawText( _T("Row 6"), 5, 130 );
}

// MyCanvas

IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxPanel)

BEGIN_EVENT_TABLE(MyCanvas, wxPanel)
  EVT_PAINT(      MyCanvas::OnPaint)
END_EVENT_TABLE()

MyCanvas::MyCanvas( wxScrolledWindow *parent, MyTopLabels *top, MyRightLabels *right,
    wxWindowID id, const wxPoint &pos, const wxSize &size )
        : wxPanel( parent, id, pos, size, wxSUNKEN_BORDER, _T("test canvas") )
{
    m_owner = parent;
    m_topLabels = top;
    m_rightLabels = right;

    (void)new wxButton( this, wxID_ANY, _T("Hallo I"), wxPoint(0,50), wxSize(100,25) );
    (void)new wxButton( this, wxID_ANY, _T("Hallo II"), wxPoint(200,50), wxSize(100,25) );

    (void)new wxTextCtrl( this, wxID_ANY, _T("Text I"), wxPoint(0,100), wxSize(100,25) );
    (void)new wxTextCtrl( this, wxID_ANY, _T("Text II"), wxPoint(200,100), wxSize(100,25) );

    (void)new wxComboBox( this, wxID_ANY, _T("ComboBox I"), wxPoint(0,150), wxSize(100,25));
    (void)new wxComboBox( this, wxID_ANY, _T("ComboBox II"), wxPoint(200,150), wxSize(100,25));

    SetBackgroundColour( wxT("WHEAT") );

    SetCursor( wxCursor( wxCURSOR_IBEAM ) );
}

void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
    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))
        {
            wxLogMessage( wxT("Redraw first cell") );
            dc.DrawRectangle( 0, 0, 100, 25 );
            dc.DrawText( _T("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))
        {
            wxLogMessage( wxT("Redraw second cell") );
            dc.DrawRectangle( 200, 0, 100, 25 );
            dc.DrawText( _T("Second Cell"), 205, 5 );
        }
    }

}

void MyCanvas::ScrollWindow( int dx, int dy, const wxRect *rect )
{
    wxPanel::ScrollWindow( dx, dy, rect );
    m_topLabels->ScrollWindow( dx, 0, rect );
    m_rightLabels->ScrollWindow( 0, dy, rect );
}

// MyFrame

const int ID_QUIT  = wxID_EXIT;
const int ID_FULL  = 109;
const int ID_ABOUT = wxID_ABOUT;

IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )

BEGIN_EVENT_TABLE(MyFrame,wxFrame)
  EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
  EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
  EVT_MENU    (ID_FULL,  MyFrame::OnFullScreen)
END_EVENT_TABLE()

MyFrame::MyFrame()
       : wxFrame( (wxFrame *)NULL, wxID_ANY, _T("wxScrolledWindow sample"),
                  wxPoint(20,20), wxSize(470,500) )
{
    wxMenu *file_menu = new wxMenu();
    file_menu->Append( ID_ABOUT, _T("&About..."));
    file_menu->Append( ID_FULL, _T("&Full screen on/off"));
    file_menu->Append( ID_QUIT, _T("E&xit\tAlt-X"));

    wxMenuBar *menu_bar = new wxMenuBar();
    menu_bar->Append(file_menu, _T("&File"));

    SetMenuBar( menu_bar );

#if wxUSE_STATUSBAR
    CreateStatusBar(2);
    int widths[] = { -1, 100 };
    SetStatusWidths( 2, widths );
#endif // wxUSE_STATUSBAR

    m_scrolled = new MyScrolledWindow( this, wxID_ANY, wxDefaultPosition, wxSize(100,100) );
    m_scrolled->SetScrollbars( 10, 10, 50, 50 );

#if wxUSE_LOG
    m_log = new wxTextCtrl( this, wxID_ANY, _T("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;
#endif // wxUSE_LOG

    wxBoxSizer *topsizer = new wxBoxSizer( wxVERTICAL );
    topsizer->Add( m_scrolled, 1, wxEXPAND );
#if wxUSE_LOG
    topsizer->Add( m_log, 0, wxEXPAND );
#endif // wxUSE_LOG

    SetAutoLayout( true );
    SetSizer( topsizer );
}

void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
{
  Close( true );
}

void MyFrame::OnFullScreen( wxCommandEvent &WXUNUSED(event) )
{
   ShowFullScreen( !IsFullScreen(), wxFULLSCREEN_NOBORDER|wxFULLSCREEN_NOCAPTION );
}

void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
{
  (void)wxMessageBox( _T("wxScroll demo II\n")
                      _T("Robert Roebling (c) 1998"),
                      _T("About wxScroll II Demo"), wxICON_INFORMATION | wxOK );
}

//-----------------------------------------------------------------------------
// MyApp
//-----------------------------------------------------------------------------

bool MyApp::OnInit()
{
    if ( !wxApp::OnInit() )
        return false;

    wxFrame *frame = new MyFrame();
    frame->Show( true );

    return true;
}