view.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

/////////////////////////////////////////////////////////////////////////////
// Name:        contrib/samples/ogl/ogledit/view.cpp
// Purpose:     Implements view functionality in OGLEdit
// Author:      Julian Smart
// Modified by:
// Created:     12/07/98
// RCS-ID:      $Id: view.cpp,v 1.13 2006/02/10 11:59:45 ABX Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

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

#include "wx/colordlg.h"

#if !wxUSE_DOC_VIEW_ARCHITECTURE
#error You must set wxUSE_DOC_VIEW_ARCHITECTURE to 1 in wx_setup.h!
#endif

#include "ogledit.h"
#include "doc.h"
#include "view.h"
#include "palette.h"

IMPLEMENT_DYNAMIC_CLASS(DiagramView, wxView)

BEGIN_EVENT_TABLE(DiagramView, wxView)
    EVT_MENU(wxID_CUT, DiagramView::OnCut)
    EVT_MENU(OGLEDIT_CHANGE_BACKGROUND_COLOUR, DiagramView::OnChangeBackgroundColour)
    EVT_MENU(OGLEDIT_EDIT_LABEL, DiagramView::OnEditLabel)
END_EVENT_TABLE()

// What to do when a view is created. Creates actual
// windows for displaying the view.
bool DiagramView::OnCreate(wxDocument *doc, long WXUNUSED(flags))
{
  frame = GetMainFrame();
  canvas = GetMainFrame()->canvas;
  canvas->view = this;

  SetFrame(frame);
  Activate(true);

  // Initialize the edit menu Undo and Redo items
  doc->GetCommandProcessor()->SetEditMenu(((MyFrame *)frame)->editMenu);
  doc->GetCommandProcessor()->Initialize();

  wxShapeCanvas *shapeCanvas = (wxShapeCanvas *)canvas;
  DiagramDocument *diagramDoc = (DiagramDocument *)doc;
  shapeCanvas->SetDiagram(diagramDoc->GetDiagram());
  diagramDoc->GetDiagram()->SetCanvas(shapeCanvas);

  return true;
}

#define CENTER  false // Place the drawing to the center of the page


// Sneakily gets used for default print/preview
// as well as drawing on the screen.
void DiagramView::OnDraw(wxDC *dc)
{

  /* You might use THIS code if you were scaling
   * graphics of known size to fit on the page.
   */
  int w, h;

  // We need to adjust for the graphic size, a formula will be added
  float maxX = 900;
  float maxY = 700;
  // A better way of find the maxium values would be to search through
  // the linked list

  // Let's have at least 10 device units margin
  float marginX = 10;
  float marginY = 10;

  // Add the margin to the graphic size
  maxX += (2 * marginX);
  maxY += (2 * marginY);

  // Get the size of the DC in pixels
  dc->GetSize (&w, &h);

  // Calculate a suitable scaling factor
  float scaleX = (float) (w / maxX);
  float scaleY = (float) (h / maxY);

  // Use x or y scaling factor, whichever fits on the DC
  float actualScale = wxMin (scaleX, scaleY);

  float posX, posY;
  // Calculate the position on the DC for centring the graphic
  #if 0
     // center the drawing
      posX = (float) ((w - (200 * actualScale)) / 2.0);
      posY = (float) ((h - (200 * actualScale)) / 2.0);
  #else
     // Use defined presets
      posX = 10;
      posY = 35;
  #endif


  // Set the scale and origin
  dc->SetUserScale (actualScale, actualScale);
  dc->SetDeviceOrigin ((long) posX, (long) posY);

  // This part was added to preform the print preview and printing functions

  wxDiagram *diagram_p=((DiagramDocument*)GetDocument())->GetDiagram();  // Get the current diagram
  if (diagram_p->GetShapeList())
  {
    /* wxCursor *old_cursor = NULL; */
    wxObjectList::compatibility_iterator current = diagram_p->GetShapeList()->GetFirst();

    while (current) // Loop through the entire list of shapes
    {
        wxShape *object = (wxShape *)current->GetData();
        if (!object->GetParent())
        {
            object->Draw(* dc); // Draw the shape onto our printing dc
        }
        current = current->GetNext();  // Procede to the next shape in the list
    }
  }
}

void DiagramView::OnUpdate(wxView *WXUNUSED(sender), wxObject *WXUNUSED(hint))
{
  if (canvas)
    canvas->Refresh();
}

// Clean up windows used for displaying the view.
bool DiagramView::OnClose(bool WXUNUSED(deleteWindow))
{
  if (!GetDocument()->Close())
    return false;

  DiagramDocument *diagramDoc = (DiagramDocument *)GetDocument();
  diagramDoc->GetDiagram()->SetCanvas(NULL);

  canvas->ClearBackground();
  canvas->SetDiagram(NULL);
  canvas->view = NULL;
  canvas = NULL;

  wxString s = wxTheApp->GetAppName();
  if (frame)
    frame->SetTitle(s);

  SetFrame(NULL);

  Activate(false);

  return true;
}

wxShape *DiagramView::FindSelectedShape(void)
{
  DiagramDocument *doc = (DiagramDocument *)GetDocument();
  wxObjectList::compatibility_iterator node = doc->GetDiagram()->GetShapeList()->GetFirst();
  while (node)
  {
    wxShape *eachShape = (wxShape *)node->GetData();
    if ((eachShape->GetParent() == NULL) && eachShape->Selected())
    {
      return eachShape;
    }
    else node = node->GetNext();
  }
  return NULL;
}

void DiagramView::OnCut(wxCommandEvent& WXUNUSED(event))
{
  DiagramDocument *doc = (DiagramDocument *)GetDocument();

  wxShape *theShape = FindSelectedShape();
  if (theShape)
    doc->GetCommandProcessor()->Submit(new DiagramCommand(_T("Cut"), wxID_CUT, doc, NULL, 0.0, 0.0, true, theShape));
}

void DiagramView::OnChangeBackgroundColour(wxCommandEvent& WXUNUSED(event))
{
      DiagramDocument *doc = (DiagramDocument *)GetDocument();

      wxShape *theShape = FindSelectedShape();
      if (theShape)
      {
        wxColourData data;
        data.SetChooseFull(true);
        data.SetColour(theShape->GetBrush()->GetColour());

        wxColourDialog *dialog = new wxColourDialog(frame, &data);
        wxBrush *theBrush = NULL;
        if (dialog->ShowModal() == wxID_OK)
        {
          wxColourData retData = dialog->GetColourData();
          wxColour col = retData.GetColour();
          theBrush = wxTheBrushList->FindOrCreateBrush(col, wxSOLID);
        }
        dialog->Close();

        if (theBrush)
          doc->GetCommandProcessor()->Submit(new DiagramCommand(_T("Change colour"), OGLEDIT_CHANGE_BACKGROUND_COLOUR, doc,
            theBrush, theShape));
      }
}

void DiagramView::OnEditLabel(wxCommandEvent& WXUNUSED(event))
{
      wxShape *theShape = FindSelectedShape();
      if (theShape)
      {
        wxString newLabel = wxGetTextFromUser(_T("Enter new label"), _T("Shape Label"), ((MyEvtHandler *)theShape->GetEventHandler())->label);
        GetDocument()->GetCommandProcessor()->Submit(new DiagramCommand(_T("Edit label"), OGLEDIT_EDIT_LABEL, (DiagramDocument*) GetDocument(), newLabel, theShape));
      }
}


/*
 * Window implementations
 */

BEGIN_EVENT_TABLE(MyCanvas, wxShapeCanvas)
    EVT_MOUSE_EVENTS(MyCanvas::OnMouseEvent)
    EVT_PAINT(MyCanvas::OnPaint)
END_EVENT_TABLE()

// Define a constructor for my canvas
MyCanvas::MyCanvas(wxView *v, wxWindow *parent, wxWindowID id, const wxPoint& pos,
    const wxSize& size, long style):
 wxShapeCanvas(parent, id, pos, size, style)
{
  SetBackgroundColour(*wxWHITE);
  view = v;
}

MyCanvas::~MyCanvas(void)
{
}

void MyCanvas::OnLeftClick(double x, double y, int WXUNUSED(keys))
{
  EditorToolPalette *palette = wxGetApp().frame->palette;
  wxClassInfo *info = NULL;
  switch (palette->currentlySelected)
  {
    case PALETTE_TOOL1:
    {
      info = CLASSINFO(wxRectangleShape);
      break;
    }
    case PALETTE_TOOL2:
    {
      info = CLASSINFO(wxRoundedRectangleShape);
      break;
    }
    case PALETTE_TOOL3:
    {
      info = CLASSINFO(wxEllipseShape);
      break;
    }
    case PALETTE_TOOL4:
    {
      info = CLASSINFO(wxDiamondShape);
      break;
    }
    default:
      break;
  }
  if (info)
  {
    view->GetDocument()->GetCommandProcessor()->Submit(
      new DiagramCommand( info->GetClassName(), OGLEDIT_ADD_SHAPE, (DiagramDocument *)view->GetDocument(), info,
         x, y));
  }
}

void MyCanvas::OnRightClick(double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnDragLeft(bool WXUNUSED(draw), double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnBeginDragLeft(double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnEndDragLeft(double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnDragRight(bool WXUNUSED(draw), double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnBeginDragRight(double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnEndDragRight(double WXUNUSED(x), double WXUNUSED(y), int WXUNUSED(keys))
{
}

void MyCanvas::OnMouseEvent(wxMouseEvent& event)
{
    wxShapeCanvas::OnMouseEvent(event);
}

void MyCanvas::OnPaint(wxPaintEvent& event)
{
//  if (GetDiagram())
    wxShapeCanvas::OnPaint(event);
}