TeslaRel410/BORLAND/BC45/EXAMPLES/OWL/TUTORIAL/STEP13DV.CPP

//----------------------------------------------------------------------------
// ObjectWindows - (C) Copyright 1991, 1994 by Borland International
//   Tutorial application -- step13dv.cpp
//----------------------------------------------------------------------------
#include <owl/owlpch.h>
#include <owl/dc.h>
#include <owl/inputdia.h>
#include <owl/chooseco.h>
#include <owl/gdiobjec.h>
#include <owl/docmanag.h>
#include <owl/filedoc.h>
#include <owl/listbox.h>
#include <classlib/arrays.h>
#include "step13dv.rc"

typedef TArray<TPoint> TPoints;
typedef TArrayIterator<TPoint> TPointsIterator;

class TLine : public TPoints {
  public:
    // Constructor to allow construction from a color and a pen size.
    // Also serves as default constructor.
    TLine(const TColor& color = TColor(0), int penSize = 1) :
      TPoints(10, 0, 10), PenSize(penSize), Color(color) {}

    // Functions to modify and query pen attributes.
    int QueryPenSize() const
    {
      return PenSize;
    }
    const TColor& QueryColor() const
    {
      return Color;
    }
    void SetPen(TColor& newColor, int penSize = 0);
    void SetPen(int penSize);
    friend bool GetPenSize(TWindow* parent, TLine&);
    friend bool GetPenColor(TWindow* parent, TLine&);

    // TLine draws itself.  Returns true if everything went OK.
    virtual bool Draw(TDC&) const;

    // The == operator must be defined for the container class, even if unused
    bool operator ==(const TLine& other) const
    {
      return &other == this;
    }
    friend ostream& operator <<(ostream& os, const TLine& line);
    friend istream& operator >>(istream& is, TLine& line);

  protected:
    int PenSize;
    TColor Color;
};

typedef TArray<TLine> TLines;
typedef TArrayIterator<TLine> TLinesIterator;

class _USERCLASS TDrawDocument : public TFileDocument {
  public:
    enum {
      PrevProperty = TFileDocument::NextProperty-1,
      LineCount,
      Description,
      NextProperty,
    };

    enum {
      UndoNone,
      UndoDelete,
      UndoAppend,
      UndoModify
    };

    TDrawDocument(TDocument* parent = 0) :
      TFileDocument(parent), Lines(0), UndoLine(0), UndoState(UndoNone) {}
   ~TDrawDocument()
    {
      delete Lines;
      delete UndoLine;
    }

    // implement virtual methods of TDocument
    bool   Open(int mode, const char far* path=0);
    bool   Close();
    bool   IsOpen()
    {
      return Lines != 0;
    }

    bool   Commit(bool force = false);
    bool   Revert(bool clear = false);

    int    FindProperty(const char far* name);  // return index
    int    PropertyFlags(int index);
    const char* PropertyName(int index);
    int    PropertyCount()
    {
      return NextProperty - 1;
    }

    int    GetProperty(int index, void far* dest, int textlen=0);

    // data access functions
    const TLine* GetLine(unsigned int index);
    int    AddLine(TLine& line);
    void   DeleteLine(unsigned int index);
    void   ModifyLine(TLine& line, unsigned int index);
    void   Clear();
    void   Undo();

  protected:
    TLines* Lines;
    TLine* UndoLine;
    int    UndoState;
    int    UndoIndex;
    string FileInfo;
};

class _USERCLASS TDrawView : public TWindowView {
  public:
    TDrawView(TDrawDocument& doc, TWindow* parent = 0);
   ~TDrawView()
    {
      delete DragDC;
      delete Line;
    }

    static const char far* StaticName()
    {
      return "Draw View";
    }

    const char far* GetViewName()
    {
      return StaticName();
    }

  protected:
    TDrawDocument* DrawDoc;  // same as Doc member, but cast to derived class
    TDC* DragDC;
    TPen* Pen;
    TLine* Line; // To hold a single line sent or received from document

    // Message response functions
    void EvLButtonDown(uint, TPoint&);
    void EvRButtonDown(uint, TPoint&);
    void EvMouseMove(uint, TPoint&);
    void EvLButtonUp(uint, TPoint&);
    void Paint(TDC&, bool, TRect&);
    void CmPenSize();
    void CmPenColor();
    void CmClear();
    void CmUndo();

    // Document notifications
    bool VnCommit(bool force);
    bool VnRevert(bool clear);
    bool VnAppend(unsigned int index);
    bool VnDelete(unsigned int index);
    bool VnModify(unsigned int index);

    DECLARE_RESPONSE_TABLE(TDrawView);
};

class _USERCLASS TDrawListView : public TListBox, public TView {
  public:
    TDrawListView(TDrawDocument& doc, TWindow* parent = 0);
   ~TDrawListView(){}
    static const char far* StaticName()
    {
      return "DrawList View";
    }

    int CurIndex;

    // Overridden virtuals from TView
    //
    const char far* GetViewName()
    {
      return StaticName();
    }

    TWindow* GetWindow()
    {
      return (TWindow*)this;
    }

    bool     SetDocTitle(const char far* docname, int index)
    {
      return TListBox::SetDocTitle(docname, index);
    }

    // Overridden virtuals from TWindow
    //
    bool CanClose()   {return TListBox::CanClose() && Doc->CanClose();}
    bool Create();

  protected:
    TDrawDocument* DrawDoc;  // same as Doc member, but cast to derived class
    void LoadData();
    void FormatData(const TLine* line, unsigned int index);

    // Message response functions
    void CmPenSize();
    void CmPenColor();
    void CmClear();
    void CmUndo();
    void CmDelete();

    // Document notifications
    bool VnIsWindow(HWND hWnd)
    {
      return HWindow == hWnd;
    }

    bool VnCommit(bool force);
    bool VnRevert(bool clear);
    bool VnAppend(unsigned int index);
    bool VnDelete(unsigned int index);
    bool VnModify(unsigned int index);

  DECLARE_RESPONSE_TABLE(TDrawListView);
};

const int vnDrawAppend = vnCustomBase+0;
const int vnDrawDelete = vnCustomBase+1;
const int vnDrawModify = vnCustomBase+2;

NOTIFY_SIG(vnDrawAppend, unsigned int)
NOTIFY_SIG(vnDrawDelete, unsigned int)
NOTIFY_SIG(vnDrawModify, unsigned int)

#define EV_VN_DRAWAPPEND  VN_DEFINE(vnDrawAppend,  VnAppend,  int)
#define EV_VN_DRAWDELETE  VN_DEFINE(vnDrawDelete,  VnDelete,  int)
#define EV_VN_DRAWMODIFY  VN_DEFINE(vnDrawModify,  VnModify,  int)

DEFINE_DOC_TEMPLATE_CLASS(TDrawDocument, TDrawView,   DrawTemplate);
DEFINE_DOC_TEMPLATE_CLASS(TDrawDocument, TDrawListView,   DrawListTemplate);
DrawTemplate drawTpl("Point Files (*.PTS)","*.pts",0,"PTS",dtAutoDelete|dtUpdateDir);
DrawListTemplate drawListTpl("Line List","  *.pts",0,"PTS",dtAutoDelete|dtHidden);

void
TLine::SetPen(int penSize)
{
  if (penSize < 1)
    PenSize = 1;
  else
    PenSize = penSize;
}

void
TLine::SetPen(TColor& newColor, int penSize)
{
  // If penSize isn't the default (0), set PenSize to the new size.
  if (penSize)
    PenSize = penSize;

  Color = newColor;
}

bool
TLine::Draw(TDC& dc) const
{
  // Set pen for the dc to the values for this line
  TPen pen(Color, PenSize);
  dc.SelectObject(pen);

  // Iterates through the points in the line i.
  TPointsIterator j(*this);
  bool first = true;

  while (j) {
    TPoint p = j++;

    if (!first)
      dc.LineTo(p);
    else {
      dc.MoveTo(p);
      first = false;
    }
  }
  dc.RestorePen();
  return true;
}

ostream&
operator <<(ostream& os, const TLine& line)
{
  // Write the number of points in the line
  os << line.GetItemsInContainer();

  // Get and write pen attributes.
  os << ' ' << line.Color << ' ' << line.PenSize;

  // Get an iterator for the array of points
  TPointsIterator j(line);

  // While the iterator is valid (i.e. we haven't run out of points)
  while(j)
    // Write the point from the iterator and increment the array.
    os << j++;
  os << '\n';

  // return the stream object
  return os;
}

istream&
operator >>(istream& is, TLine& line)
{
  unsigned numPoints;
  is >> numPoints;

  COLORREF color;
  int penSize;
  is >> color >> penSize;
  line.SetPen(TColor(color), penSize);

  while (numPoints--) {
    TPoint point;
    is >> point;
    line.Add(point);
  }

  // return the stream object
  return is;
}

bool
TDrawDocument::Commit(bool force)
{
  if (!IsDirty() && !force)
    return true;

  TOutStream* os = OutStream(ofWrite);
  if (!os)
    return false;

  // Write the number of lines in the figure
  *os << Lines->GetItemsInContainer();

  // Append a description using a resource string
  *os << ' ' << FileInfo << '\n';

  // Get an iterator for the array of lines
  TLinesIterator i(*Lines);

  // While the iterator is valid (i.e. we haven't run out of lines)
  while (i) {
    // Copy the current line from the iterator and increment the array.
    *os << i++;
  }
  delete os;

  SetDirty(false);
  return true;
}

bool
TDrawDocument::Revert(bool clear)
{
  if (!TFileDocument::Revert(clear))
    return false;
  if (!clear)
    Open(0);
  return true;
}

bool
TDrawDocument::Open(int /*mode*/, const char far* path)
{
  char fileinfo[100];
  Lines = new TLines(5, 0, 5);
  if (path)
    SetDocPath(path);
  if (GetDocPath()) {
    TInStream* is = InStream(ofRead);
    if (!is)
      return false;

    unsigned numLines;
    *is >> numLines;
    is->getline(fileinfo, sizeof(fileinfo));
    while (numLines--) {
      TLine line;
      *is >> line;
      Lines->Add(line);
    }
    delete is;
    FileInfo = fileinfo;
  }
  else
    FileInfo = string(*::Module,IDS_FILEINFO);
  SetDirty(false);
  UndoState = UndoNone;
  return true;
}

bool
TDrawDocument::Close()
{
  delete Lines;
  Lines = 0;
  return true;
}

const TLine*
TDrawDocument::GetLine(unsigned int index)
{
  if (!IsOpen() && !Open(ofRead | ofWrite))
    return 0;
  return index < Lines->GetItemsInContainer() ? &(*Lines)[index] : 0;
}

int
TDrawDocument::AddLine(TLine& line)
{
  int index = Lines->GetItemsInContainer();
  Lines->Add(line);
  SetDirty(true);
  NotifyViews(vnDrawAppend, index);
  UndoState = UndoAppend;
  return index;
}

void
TDrawDocument::DeleteLine(unsigned int index)
{
  const TLine* oldLine = GetLine(index);
  if (!oldLine)
    return;
  delete UndoLine;
  UndoLine = new TLine(*oldLine);
  Lines->Detach(index);
  SetDirty(true);
  NotifyViews(vnDrawDelete, index);
  UndoState = UndoDelete;
}

void
TDrawDocument::ModifyLine(TLine& line, unsigned int index)
{
  delete UndoLine;
  UndoLine = new TLine((*Lines)[index]);
  SetDirty(true);
  (*Lines)[index] = line;
  NotifyViews(vnDrawModify, index);
  UndoState = UndoModify;
  UndoIndex = index;
}

void
TDrawDocument::Clear()
{
  Lines->Flush();
  NotifyViews(vnRevert, true);
}

void
TDrawDocument::Undo()
{
  switch (UndoState) {
    case UndoAppend:
      DeleteLine(Lines->GetItemsInContainer()-1);
      return;
    case UndoDelete:
      AddLine(*UndoLine);
      delete UndoLine;
      UndoLine = 0;
      return;
    case UndoModify:
      TLine* temp = UndoLine;
      UndoLine = 0;
      ModifyLine(*temp, UndoIndex);
      delete temp;
  }
}

bool
GetPenSize(TWindow* parent, TLine& line)
{
  char inputText[6];

  wsprintf(inputText, "%d", line.PenSize);
  if (TInputDialog(parent, "Line Thickness",
                        "Input a new thickness:",
                        inputText,
                        sizeof(inputText),::Module).Execute() != IDOK)
    return false;
  line.PenSize = atoi(inputText);

  if (line.PenSize < 1)
    line.PenSize = 1;

  return true;
}

bool
GetPenColor(TWindow* parent, TLine& line)
{
  TChooseColorDialog::TData colors;
  static TColor custColors[16] =
  {
    0x010101L, 0x101010L, 0x202020L, 0x303030L,
    0x404040L, 0x505050L, 0x606060L, 0x707070L,
    0x808080L, 0x909090L, 0xA0A0A0L, 0xB0B0B0L,
    0xC0C0C0L, 0xD0D0D0L, 0xE0E0E0L, 0xF0F0F0L
  };

  colors.Flags = CC_RGBINIT;
  colors.Color = TColor(line.QueryColor());
  colors.CustColors = custColors;
  if (TChooseColorDialog(parent, colors).Execute() != IDOK)
    return false;
  line.SetPen(colors.Color);
  return true;
}

DEFINE_RESPONSE_TABLE1(TDrawView, TWindowView)
  EV_WM_LBUTTONDOWN,
  EV_WM_RBUTTONDOWN,
  EV_WM_MOUSEMOVE,
  EV_WM_LBUTTONUP,
  EV_COMMAND(CM_PENSIZE, CmPenSize),
  EV_COMMAND(CM_PENCOLOR, CmPenColor),
  EV_COMMAND(CM_CLEAR, CmClear),
  EV_COMMAND(CM_UNDO, CmUndo),
  EV_VN_COMMIT,
  EV_VN_REVERT,
  EV_VN_DRAWAPPEND,
  EV_VN_DRAWDELETE,
  EV_VN_DRAWMODIFY,
END_RESPONSE_TABLE;

TDrawView::TDrawView(TDrawDocument& doc,TWindow* parent) :
  TWindowView(doc, parent), DrawDoc(&doc)
{
  DragDC  = 0;
  Line    = new TLine(TColor::Black, 1);
  SetViewMenu(new TMenuDescr(IDM_DRAWVIEW));
}

void
TDrawView::EvLButtonDown(uint, TPoint& point)
{
  if (!DragDC) {
    SetCapture();
    DragDC = new TClientDC(*this);
    Pen = new TPen(Line->QueryColor(), Line->QueryPenSize());
    DragDC->SelectObject(*Pen);
    DragDC->MoveTo(point);
    Line->Add(point);
  }
}

void
TDrawView::EvRButtonDown(uint, TPoint&)
{
  CmUndo();
}

void
TDrawView::EvMouseMove(uint, TPoint& point)
{
  if (DragDC) {
    DragDC->LineTo(point);
    Line->Add(point);
  }
}

void
TDrawView::EvLButtonUp(uint, TPoint&)
{
  if (DragDC) {
    ReleaseCapture();
    if (Line->GetItemsInContainer() > 1)
      DrawDoc->AddLine(*Line);
    Line->Flush();
    delete DragDC;
    delete Pen;
    DragDC = 0;
  }
}

void
TDrawView::CmPenSize()
{
  GetPenSize(this, *Line);
}

void
TDrawView::CmPenColor()
{
  GetPenColor(this, *Line);
}

void
TDrawView::CmClear()
{
  DrawDoc->Clear();
}

void
TDrawView::CmUndo()
{
  DrawDoc->Undo();
}

void
TDrawView::Paint(TDC& dc, bool, TRect&)
{
  // Iterates through the array of line objects.
  int i = 0;
  const TLine* line;
  while ((line = DrawDoc->GetLine(i++)) != 0)
    line->Draw(dc);
}

bool
TDrawView::VnCommit(bool /*force*/)
{
  // nothing to do here, no data held in view
  return true;
}

bool
TDrawView::VnRevert(bool /*clear*/)
{
  Invalidate();  // force full repaint
  return true;
}

bool
TDrawView::VnAppend(unsigned int index)
{
  TClientDC dc(*this);
  const TLine* line = DrawDoc->GetLine(index);
  line->Draw(dc);
  return true;
}

bool
TDrawView::VnModify(unsigned int /*index*/)
{
  Invalidate();  // force full repaint
  return true;
}

bool
TDrawView::VnDelete(unsigned int /*index*/)
{
  Invalidate();  // force full repaint
  return true;
}

DEFINE_RESPONSE_TABLE1(TDrawListView, TListBox)
  EV_COMMAND(CM_PENSIZE, CmPenSize),
  EV_COMMAND(CM_PENCOLOR, CmPenColor),
  EV_COMMAND(CM_CLEAR, CmClear),
  EV_COMMAND(CM_UNDO, CmUndo),
  EV_COMMAND(CM_DELETE, CmDelete),
  EV_VN_ISWINDOW,
  EV_VN_COMMIT,
  EV_VN_REVERT,
  EV_VN_DRAWAPPEND,
  EV_VN_DRAWDELETE,
  EV_VN_DRAWMODIFY,
END_RESPONSE_TABLE;

TDrawListView::TDrawListView(TDrawDocument& doc,TWindow* parent) :
  TView(doc), TListBox(parent, GetNextViewId(), 0,0,0,0), DrawDoc(&doc)
{
  Attr.Style &= ~(WS_BORDER | LBS_SORT);
  Attr.Style |= LBS_NOINTEGRALHEIGHT;
  Attr.AccelTable = IDA_DRAWLISTVIEW;
  SetViewMenu(new TMenuDescr(IDM_DRAWLISTVIEW,0,1,0,0,0,0));
}

bool
TDrawListView::Create()
{
  TListBox::Create();
  LoadData();
  return true;
}

void
TDrawListView::LoadData()
{
  ClearList();
  int i = 0;
  const TLine* line;
  while ((line = DrawDoc->GetLine(i)) != 0)
    FormatData(line, i++);

  SetSelIndex(0);
}

void
TDrawListView::FormatData(const TLine* line, int unsigned index)
{
  char buf[80];
  TColor color(line->QueryColor());
  wsprintf(buf, "Color = R%d G%d B%d, Size = %d, Points = %d",
           color.Red(), color.Green(), color.Blue(),
           line->QueryPenSize(), line->GetItemsInContainer());
  DeleteString(index);
  InsertString(buf, index);
  SetSelIndex(index);
}

void
TDrawListView::CmPenSize()
{
  int index = GetSelIndex();
  const TLine* line = DrawDoc->GetLine(index);
  if (line) {
    TLine* newline = new TLine(*line);
    if (GetPenSize(this, *newline))
      DrawDoc->ModifyLine(*newline, index);
    delete newline;
  }
}

void
TDrawListView::CmPenColor()
{
  int index = GetSelIndex();
  const TLine* line = DrawDoc->GetLine(index);
  if (line) {
    TLine* newline = new TLine(*line);
    if (GetPenColor(this, *newline))
      DrawDoc->ModifyLine(*newline, index);
    delete newline;
  }
}

void
TDrawListView::CmClear()
{
  DrawDoc->Clear();
}

void
TDrawListView::CmUndo()
{
  DrawDoc->Undo();
}

void
TDrawListView::CmDelete()
{
  DrawDoc->DeleteLine(GetSelIndex());
}

bool
TDrawListView::VnCommit(bool /*force*/)
{
  return true;
}

bool
TDrawListView::VnRevert(bool /*clear*/)
{
  LoadData();
  return true;
}

bool
TDrawListView::VnAppend(unsigned int index)
{
  const TLine* line = DrawDoc->GetLine(index);
  FormatData(line, index);
  SetSelIndex(index);
  return true;
}

bool
TDrawListView::VnDelete(unsigned int index)
{
  DeleteString(index);
  HandleMessage(WM_KEYDOWN,VK_DOWN); // force selection
  return true;
}

bool
TDrawListView::VnModify(unsigned int index)
{
  const TLine* line = DrawDoc->GetLine(index);
  FormatData(line, index);
  return true;
}

static char* PropNames[] = {
  "Line Count",                  // LineCount
  "Description",                         // Description
};

static int PropFlags[] = {
  pfGetBinary|pfGetText, // LineCount
  pfGetText,             // Description
};

const char*
TDrawDocument::PropertyName(int index)
{
  if (index <= PrevProperty)
    return TFileDocument::PropertyName(index);
  else if (index < NextProperty)
    return PropNames[index-PrevProperty-1];
  else
    return 0;
}

int
TDrawDocument::PropertyFlags(int index)
{
  if (index <= PrevProperty)
    return TFileDocument::PropertyFlags(index);
  else if (index < NextProperty)
    return PropFlags[index-PrevProperty-1];
  else
    return 0;
}

int
TDrawDocument::FindProperty(const char far* name)
{
  for (int i=0; i < NextProperty-PrevProperty-1; i++)
    if (strcmp(PropNames[i], name) == 0)
      return i+PrevProperty+1;
  return 0;
}

int
TDrawDocument::GetProperty(int prop, void far* dest, int textlen)
{
  switch(prop) {
    case LineCount: {
      int count = Lines->GetItemsInContainer();
      if (!textlen) {
        *(int far*)dest = count;
        return sizeof(int);
      }
      return wsprintf((char far*)dest, "%d", count);
    }

    case Description: {
      char* temp = new char[textlen]; // need local copy for medium model
      int len    = FileInfo.copy(temp, textlen);
      strcpy((char far*)dest, temp);
      return len;
    }
  }
  return TFileDocument::GetProperty(prop, dest, textlen);
}