C Programming Starter Kit 2.0/SamsPublishing-CProgrammingStarterKit-v2.0-Win31.iso/bc45/tutoroot.pak/STEP07.CPP

C/C++ Source or Header | 1997-07-24 | 5.8 KB | 284 lines

//----------------------------------------------------------------------------
// ObjectWindows - (C) Copyright 1991, 1994 by Borland International
//   Tutorial application -- step07.cpp
//----------------------------------------------------------------------------
#include <owl/owlpch.h>
#include <owl/applicat.h>
#include <owl/framewin.h>
#include <owl/dc.h>
#include <owl/inputdia.h>
#include <owl/opensave.h>
#include <classlib/arrays.h>
#include <stdlib.h>
#include <string.h>
#include "step07.rc"

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

class TDrawWindow : public TWindow {
  public:
    TDrawWindow(TWindow* parent = 0);
   ~TDrawWindow()
    {
      delete DragDC;
      delete Pen;
      delete Line;
      delete FileData;
    }

    void SetPenSize(int newSize);

  protected:
    TDC* DragDC;
    int PenSize;
    TPen* Pen;
    TPoints* Line; // To store points in line.
    TOpenSaveDialog::TData* FileData;
    bool IsDirty, IsNewFile;

    // Override member function of TWindow
    bool CanClose();

    // 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 CmFileNew();
    void CmFileOpen();
    void CmFileSave();
    void CmFileSaveAs();
    void CmAbout();
    void SaveFile();
    void OpenFile();

  DECLARE_RESPONSE_TABLE(TDrawWindow);
};

DEFINE_RESPONSE_TABLE1(TDrawWindow, TWindow)
  EV_WM_LBUTTONDOWN,
  EV_WM_RBUTTONDOWN,
  EV_WM_MOUSEMOVE,
  EV_WM_LBUTTONUP,
  EV_COMMAND(CM_FILENEW, CmFileNew),
  EV_COMMAND(CM_FILEOPEN, CmFileOpen),
  EV_COMMAND(CM_FILESAVE, CmFileSave),
  EV_COMMAND(CM_FILESAVEAS, CmFileSaveAs),
  EV_COMMAND(CM_ABOUT, CmAbout),
END_RESPONSE_TABLE;

TDrawWindow::TDrawWindow(TWindow* parent)
{
  Init(parent, 0, 0);
  DragDC    = 0;
  PenSize   = 1;
  Pen       = new TPen(TColor::Black, PenSize);
  Line      = new TPoints(10, 0, 10);
  IsNewFile = true;
  IsDirty   = false;
  FileData  = new TOpenSaveDialog::TData(OFN_HIDEREADONLY|OFN_FILEMUSTEXIST,
                                        "Point Files (*.PT7)|*.pt7|", 0, "",
                                        "PT7");
}

bool
TDrawWindow::CanClose()
{
  if (IsDirty)
    switch(MessageBox("Do you want to save?", "Drawing has changed",
                      MB_YESNOCANCEL | MB_ICONQUESTION)) {
      case IDCANCEL:
        // Choosing Cancel means to abort the close -- return false.
        return false;

      case IDYES:
        // Choosing Yes means to save the drawing.
        CmFileSave();
    }
  return true;
}

void
TDrawWindow::EvLButtonDown(uint, TPoint& point)
{
  Line->Flush();
  Invalidate();

  if (!DragDC) {
    SetCapture();
    DragDC = new TClientDC(*this);
    DragDC->SelectObject(*Pen);
    DragDC->MoveTo(point);
    Line->Add(point);
    IsDirty = true;
  }
}

void
TDrawWindow::EvRButtonDown(uint, TPoint&)
{
  char inputText[6];

  wsprintf(inputText, "%d", PenSize);
  if ((TInputDialog(this, "Line Thickness",
                        "Input a new thickness:",
                        inputText,
                        sizeof(inputText))).Execute() == IDOK) {
    int newPenSize = atoi(inputText);

    if (newPenSize < 0)
      newPenSize = 1;

    SetPenSize(newPenSize);
  }
}

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

void
TDrawWindow::EvLButtonUp(uint, TPoint&)
{
  if (DragDC) {
    ReleaseCapture();
    delete DragDC;
    DragDC = 0;
  }
}

void
TDrawWindow::SetPenSize(int newSize)
{
  delete Pen;
  PenSize = newSize;
  Pen     = new TPen(TColor::Black, PenSize);
}

void
TDrawWindow::Paint(TDC& dc, bool, TRect&)
{
  bool first = true;
  TPointsIterator i(*Line);

  dc.SelectObject(*Pen);

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

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

void
TDrawWindow::CmFileNew()
{
  if (CanClose()) {
    Line->Flush();
    Invalidate();
    IsDirty = false;
    IsNewFile = true;
  }
}

void
TDrawWindow::CmFileOpen()
{
  if (CanClose())
    if ((TFileOpenDialog(this, *FileData)).Execute() == IDOK)
      OpenFile();
}

void
TDrawWindow::CmFileSave()
{
  if (IsNewFile)
    CmFileSaveAs();
  else
    SaveFile();
}

void
TDrawWindow::CmFileSaveAs()
{
  if (IsNewFile)
    strcpy(FileData->FileName, "");

  if ((TFileSaveDialog(this, *FileData)).Execute() == IDOK)
    SaveFile();
}

void
TDrawWindow::CmAbout()
{
  TDialog(this, IDD_ABOUT).Execute();
}

void
TDrawWindow::SaveFile()
{
  ofstream os(FileData->FileName);

  if (!os)
    MessageBox("Unable to open file", "File Error", MB_OK | MB_ICONEXCLAMATION);
  else {
    os << Line->GetItemsInContainer();
    TPointsIterator  i(*Line);
    while (i)
      os << i++;
    IsNewFile = IsDirty = false;
  }
}

void
TDrawWindow::OpenFile()
{
  ifstream is(FileData->FileName);

  if (!is)
    MessageBox("Unable to open file", "File Error", MB_OK | MB_ICONEXCLAMATION);
  else {
    Line->Flush();
    unsigned  numPoints;
    is >> numPoints;
    while (numPoints--) {
      TPoint point;
      is >> point;
      Line->Add(point);
    }
  }

  IsNewFile = IsDirty = false;
  Invalidate();
}

class TDrawApp : public TApplication {
  public:
    TDrawApp() : TApplication() {}

    void InitMainWindow()
    {
      SetMainWindow(new TFrameWindow(0, "Drawing Pad", new TDrawWindow));
      GetMainWindow()->AssignMenu("COMMANDS");
    }
};

int
OwlMain(int /*argc*/, char* /*argv*/ [])
{
  return TDrawApp().Run();
}