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path: root/support/dktools/Dk4WxControl.cpt
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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file	Dk4WxControl.h	Triple-buffered control.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef WX_WXPREC_H_INCLUDED
#include <wx/wxprec.h>
#define	WX_WXPREC_H_INCLUDED 1
#endif
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#ifndef WX_WX_H_INCLUDED
#include <wx/wx.h>
#define	WX_WX_H_INCLUDED 1
#endif
#endif



/**	Base class for user-defined controls.
	Like double-buffering we write the windows contents
	to an image and finally transfer the entire image
	to the device context.
	Additionally we keep the image between the paint events
	and rebuild the image only if necessary (data to show
	has changed).

	When the frame containing your view becomes invisible
	(frame iconized or hidden) you should use the ReleaseBuffer()
	method to decrease the memory footprint of the program.

	In your derived class, call the Dk4WxControl constructors from
	the constructors.
	From Create() call Dk4WxControl::Create().

	You should also use DECLARE_DYNAMIC_CLASS() and
	IMPLEMENT_DYNAMIC_CLASS().
*/
class Dk4WxControl : public wxControl
{
  private:

    /**	For RTTI.
    */
    DECLARE_DYNAMIC_CLASS(Dk4WxControl)

    /**	Event table.
    */
    DECLARE_EVENT_TABLE()

  protected:

    /**	Class name.
    */
    static const wxChar	Dk4WxControlName[];

    /**	Protection against simultaneous access.
    */
    wxCriticalSection	csProtect;

    /**	Bitmap to cache contents.
    */
    wxBitmap		*pBitmap;

    /**	Bitmap width.
    */
    int			iBmWidth;

    /**	Bitmap height.
    */
    int			iBmHeight;

    /**	Flag: Must update contents.
    */
    bool		bUpdate;

  protected:

    /**	Overwrite this method to do the real drawing.
	@param	pdc		Device context to draw to.
	@param	event		Paint event to draw for.
	@param	buffered	Flag: Operating on memory DC.
	@param	clWidth		Client area width.
	@param	clHeight	Client area height.
    */
    virtual
    void
    PaintOperation(
      wxDC &		pdc,
      wxPaintEvent &	event,
      bool		buffered,
      int		clWidth,
      int		clHeight
    );

    /**	Internal paint operation.
	@param	pdc		Device context to draw to.
	@param	event		Paint event to draw for.
	@param	buffered	Flag: Operating on memory DC.
	@param	clWidth		Client area width.
	@param	clHeight	Client area height.
    */
    void
    InternalPaint(
      wxDC &		pdc,
      wxPaintEvent &	event,
      bool		buffered,
      int		clWidth,
      int		clHeight
    );

  public:

    /**	Default constructor.
    */
    Dk4WxControl();

    /**	Useful constructor.
	@param	parent		Parent window.
	@param	wid		Window ID.
	@param	pos		Position.
	@param	size		Size.
	@param	style		Style.
	@param	validator	Validator.
	@param	name		Type name.
    */
    Dk4WxControl(
      wxWindow			*parent,
      wxWindowID		 wid		= wxID_ANY,
      const wxPoint &		 pos		= wxDefaultPosition,
      const wxSize &		 size		= wxDefaultSize,
      long			 style		= 0L,
      const wxValidator &	 validator	= wxDefaultValidator,
      const wxChar		*name		= Dk4WxControlName
    );

    /**	Create window after using default constructor.
	@param	parent		Parent window.
	@param	wid		Window ID.
	@param	pos		Position.
	@param	size		Size.
	@param	style		Style.
	@param	validator	Validator.
	@param	name		Type name.
    */
    bool
    Create(
      wxWindow			*parent,
      wxWindowID		 wid		= wxID_ANY,
      const wxPoint &		 pos		= wxDefaultPosition,
      const wxSize &		 size		= wxDefaultSize,
      long			 style		= 0L,
      const wxValidator &	 validator	= wxDefaultValidator,
      const wxChar		*name		= Dk4WxControlName
    );

    /**	Destructor.
    */
    ~Dk4WxControl();

    /**	Mark update necessarity.
    */
    void
    SetUpdate(bool flag = true);

    /**	Handler for erase background event.
	@param	event	Event to process.
    */
    void
    OnErase(wxEraseEvent & event);

    /**	Handler for paint event.
	@param	event	Event to process.
    */
    void
    OnPaint(wxPaintEvent & event);

    /**	Release buffer when frame is iconized or hidden.
    */
    void
    ReleaseBuffer(void);
};	



%%	module

#include "Dk4WxControl.h"



$!trace-include



const wxChar Dk4WxControl::Dk4WxControlName[] = { wxT("Dk4WxControl") };


IMPLEMENT_DYNAMIC_CLASS(Dk4WxControl, wxControl)

BEGIN_EVENT_TABLE(Dk4WxControl, wxControl)
	EVT_ERASE_BACKGROUND(Dk4WxControl::OnErase)
	EVT_PAINT(Dk4WxControl::OnPaint)
END_EVENT_TABLE()



Dk4WxControl::Dk4WxControl()
: wxControl()
{
  $? "+ Dk4WxControl()"
  pBitmap	= NULL;
  iBmWidth	= -1;
  iBmHeight	= -1;
  SetBackgroundStyle(wxBG_STYLE_CUSTOM);
  $? "- Dk4WxControl()"
}



bool
Dk4WxControl::Create(
  wxWindow		*parent,
  wxWindowID		 wid,
  const wxPoint &	 pos,
  const wxSize &	 size,
  long			 style,
  const wxValidator &	 validator,
  const wxChar		*name
)
{
  bool	back;
  $? "+ Create"
  back = wxControl::Create(
    parent, wid, pos, size, style, validator, name
  );
  pBitmap	= NULL;
  iBmWidth	= -1;
  iBmHeight	= -1;
  SetBackgroundStyle(wxBG_STYLE_CUSTOM);
  $? "- Create"
  return back;
}

    
    
Dk4WxControl::Dk4WxControl(
  wxWindow		*parent,
  wxWindowID		 wid,
  const wxPoint &	 pos,
  const wxSize &	 size,
  long			 style,
  const wxValidator &	 validator,
  const wxChar		*name
)
: wxControl( parent, wid, pos, size, style, validator, wxString(name))
{
  $? "+ Dk4WxControl(...)"
  pBitmap	= NULL;
  iBmWidth	= -1;
  iBmHeight	= -1;
  SetBackgroundStyle(wxBG_STYLE_CUSTOM);
  $? "- Dk4WxControl(...)"
}



Dk4WxControl::~Dk4WxControl()
{
  $? "+ ~Dk4WxControl"
  {
    wxCriticalSectionLocker	lock(csProtect);
    if (NULL != pBitmap) { delete(pBitmap); }
    pBitmap	= NULL;
    iBmWidth	= -1;
    iBmHeight	= -1;
  }
  $? "- ~Dk4WxControl"
}



void
Dk4WxControl::OnErase(wxEraseEvent & event)
{
  $? "+ OnErase"
  $? "- OnErase"
}



void
Dk4WxControl::PaintOperation(
  wxDC &		pdc,
  wxPaintEvent &	event,
  bool			buffered,
  int			clWidth,
  int			clHeight
)
{
  pdc.SetBrush(*wxWHITE_BRUSH);
  pdc.DrawRectangle(0, 0, clWidth, clHeight);
}



void
Dk4WxControl::InternalPaint(
  wxDC &		pdc,
  wxPaintEvent &	event,
  bool			buffered,
  int			clWidth,
  int			clHeight
)
{
  /*	Save current DC settings.
  */
  wxBrush	const	br	=	pdc.GetBrush();
  wxBrush	const	bg	=	pdc.GetBackground();
  wxFont	const	fn	=	pdc.GetFont();
  wxPen		const	pn	=	pdc.GetPen();
  wxColour	const	tbg	=	pdc.GetTextBackground();
  wxColour	const	tfg	=	pdc.GetTextForeground();
  int			bgm	=	pdc.GetBackgroundMode();
  $? "+ InternalPaint"
  /*	Do the real pain operation.
  */
  PaintOperation(pdc, event, buffered, clWidth, clHeight);
  /*	Restore DC settings from start.
  */
  pdc.SetBackgroundMode(bgm);
  pdc.SetTextForeground(tfg);
  pdc.SetTextBackground(tbg);
  pdc.SetPen(pn);
  pdc.SetFont(fn);
  pdc.SetBackground(bg);
  pdc.SetBrush(br);
  $? "- InternalPaint"
}



void
Dk4WxControl::OnPaint(wxPaintEvent & event)
{
  wxPaintDC	paintDC(this);
  int		w		= 0;
  int		h		= 0;
  bool		mustDraw	= false;
  bool		done		= false;
  $? "+ OnPaint"
  {
    wxCriticalSectionLocker	lock(csProtect);
    wxSize			sz = GetClientSize();
    mustDraw = bUpdate;
#if VERSION_BEFORE_20150821
    w = iBmWidth;
    h = iBmHeight;
#endif
    if (NULL != pBitmap) {
      if ((iBmWidth != sz.x) || (iBmHeight != sz.y)) {
        delete(pBitmap);
	pBitmap = NULL;
      }
    }
    w = iBmWidth = sz.x;
    h = iBmHeight = sz.y;
    if (NULL == pBitmap) {
      pBitmap = new wxBitmap(iBmWidth, iBmHeight);
      mustDraw = true;
    }
    if (NULL != pBitmap) {
      if (mustDraw) {
        wxMemoryDC	memDC;
	memDC.SelectObject(*pBitmap);
	InternalPaint(memDC, event, true, w, h);
	memDC.SelectObject(wxNullBitmap);
	bUpdate = false;
      }
      paintDC.DrawBitmap(*pBitmap, 0, 0, false);
      done = true;
    }
  }
  if (!(done)) {
    InternalPaint(paintDC, event, false, w, h);
  }
  $? "- OnPaint"
}



void
Dk4WxControl::SetUpdate(bool flag)
{
  $? "+ SetUpdate"
  if (flag) {
    wxCriticalSectionLocker	lock(csProtect);
    bUpdate = true;
  }
  $? "- SetUpdate"
}



void
Dk4WxControl::ReleaseBuffer(void)
{
  {
     wxCriticalSectionLocker	lock(csProtect);
     if (NULL != pBitmap) {
       delete(pBitmap);
       pBitmap = NULL;
     }
  }
}