wxWidgets/samples/docview/view.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        view.cpp
// Purpose:     View classes
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

// 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

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

#include "docview.h"
#include "doc.h"
#include "view.h"

IMPLEMENT_DYNAMIC_CLASS(DrawingView, wxView)

// For drawing lines in a canvas
float xpos = -1;
float ypos = -1;

BEGIN_EVENT_TABLE(DrawingView, wxView)
    EVT_MENU(DOODLE_CUT, DrawingView::OnCut)
END_EVENT_TABLE()

// What to do when a view is created. Creates actual
// windows for displaying the view.
bool DrawingView::OnCreate(wxDocument *doc, long WXUNUSED(flags) )
{
    if (!singleWindowMode)
    {
        // Multiple windows
        frame = wxGetApp().CreateChildFrame(doc, this, true);
        frame->SetTitle(_T("DrawingView"));
        
        canvas = GetMainFrame()->CreateCanvas(this, frame);
#ifdef __X__
        // X seems to require a forced resize
        int x, y;
        frame->GetSize(&x, &y);
        frame->SetSize(wxDefaultCoord, wxDefaultCoord, x, y);
#endif
        frame->Show(true);
    }
    else
    {
        // Single-window mode
        frame = GetMainFrame();
        canvas = GetMainFrame()->canvas;
        canvas->view = this;
        
        // Associate the appropriate frame with this view.
        SetFrame(frame);
        
        // Make sure the document manager knows that this is the
        // current view.
        Activate(true);
        
        // Initialize the edit menu Undo and Redo items
        doc->GetCommandProcessor()->SetEditMenu(((MyFrame *)frame)->editMenu);
        doc->GetCommandProcessor()->Initialize();
    }
    
    return true;
}

// Sneakily gets used for default print/preview
// as well as drawing on the screen.
void DrawingView::OnDraw(wxDC *dc)
{
    dc->SetFont(*wxNORMAL_FONT);
    dc->SetPen(*wxBLACK_PEN);
    
    wxList::compatibility_iterator node = ((DrawingDocument *)GetDocument())->GetDoodleSegments().GetFirst();
    while (node)
    {
        DoodleSegment *seg = (DoodleSegment *)node->GetData();
        seg->Draw(dc);
        node = node->GetNext();
    }
}

void DrawingView::OnUpdate(wxView *WXUNUSED(sender), wxObject *WXUNUSED(hint))
{
    if (canvas)
        canvas->Refresh();
    
/* Is the following necessary?
#ifdef __WXMSW__
    if (canvas)
        canvas->Refresh();
#else
    if (canvas)
    {
        wxClientDC dc(canvas);
        dc.Clear();
        OnDraw(& dc);
    }
#endif
*/
}

// Clean up windows used for displaying the view.
bool DrawingView::OnClose(bool deleteWindow)
{
    if (!GetDocument()->Close())
        return false;
    
    // Clear the canvas in  case we're in single-window mode,
    // and the canvas stays.
    canvas->ClearBackground();
    canvas->view = (wxView *) NULL;
    canvas = (MyCanvas *) NULL;
    
    wxString s(wxTheApp->GetAppDisplayName());
    if (frame)
        frame->SetTitle(s);
    
    SetFrame((wxFrame *) NULL);
    
    Activate(false);
    
    if (deleteWindow && !singleWindowMode)
    {
        delete frame;
        return true;
    }
    return true;
}

void DrawingView::OnCut(wxCommandEvent& WXUNUSED(event) )
{
    DrawingDocument *doc = (DrawingDocument *)GetDocument();
    doc->GetCommandProcessor()->Submit(new DrawingCommand(_T("Cut Last Segment"), DOODLE_CUT, doc, (DoodleSegment *) NULL));
}

IMPLEMENT_DYNAMIC_CLASS(TextEditView, wxView)

bool TextEditView::OnCreate(wxDocument *doc, long WXUNUSED(flags) )
{
    frame = wxGetApp().CreateChildFrame(doc, this, false);
    
    int width, height;
    frame->GetClientSize(&width, &height);
    textsw = new MyTextWindow(this, frame, wxPoint(0, 0), wxSize(width, height), wxTE_MULTILINE);
    frame->SetTitle(_T("TextEditView"));
    
#ifdef __X__
    // X seems to require a forced resize
    int x, y;
    frame->GetSize(&x, &y);
    frame->SetSize(wxDefaultCoord, wxDefaultCoord, x, y);
#endif
    
    frame->Show(true);
    Activate(true);
    
    return true;
}

// Handled by wxTextWindow
void TextEditView::OnDraw(wxDC *WXUNUSED(dc) )
{
}

void TextEditView::OnUpdate(wxView *WXUNUSED(sender), wxObject *WXUNUSED(hint) )
{
}

bool TextEditView::OnClose(bool deleteWindow)
{
    if (!GetDocument()->Close())
        return false;
    
    Activate(false);
    
    if (deleteWindow)
    {
        delete frame;
        return true;
    }
    return true;
}

/*
* Window implementations
*/

BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
    EVT_MOUSE_EVENTS(MyCanvas::OnMouseEvent)
END_EVENT_TABLE()

// Define a constructor for my canvas
MyCanvas::MyCanvas(wxView *v, wxFrame *frame, const wxPoint& pos, const wxSize& size, const long style):
    wxScrolledWindow(frame, wxID_ANY, pos, size, style)
{
    view = v;
}

// Define the repainting behaviour
void MyCanvas::OnDraw(wxDC& dc)
{
    if (view)
        view->OnDraw(& dc);
}

// This implements a tiny doodling program. Drag the mouse using
// the left button.
void MyCanvas::OnMouseEvent(wxMouseEvent& event)
{
    if (!view)
        return;
    
    static DoodleSegment *currentSegment = (DoodleSegment *) NULL;
    
    wxClientDC dc(this);
    PrepareDC(dc);
    
    dc.SetPen(*wxBLACK_PEN);
    
    wxPoint pt(event.GetLogicalPosition(dc));
    
    if (currentSegment && event.LeftUp())
    {
        if (currentSegment->lines.GetCount() == 0)
        {
            delete currentSegment;
            currentSegment = (DoodleSegment *) NULL;
        }
        else
        {
            // We've got a valid segment on mouse left up, so store it.
            DrawingDocument *doc = (DrawingDocument *)view->GetDocument();
            
            doc->GetCommandProcessor()->Submit(new DrawingCommand(_T("Add Segment"), DOODLE_ADD, doc, currentSegment));
            
            view->GetDocument()->Modify(true);
            currentSegment = (DoodleSegment *) NULL;
        }
    }
    
    if (xpos > -1 && ypos > -1 && event.Dragging())
    {
        if (!currentSegment)
            currentSegment = new DoodleSegment;
        
        DoodleLine *newLine = new DoodleLine;
        newLine->x1 = (long)xpos; 
        newLine->y1 = (long)ypos;
        newLine->x2 = pt.x; 
        newLine->y2 = pt.y;
        currentSegment->lines.Append(newLine);
        
        dc.DrawLine( (long)xpos, (long)ypos, pt.x, pt.y);
    }
    xpos = pt.x;
    ypos = pt.y;
}

// Define a constructor for my text subwindow
MyTextWindow::MyTextWindow(wxView *v, wxFrame *frame, const wxPoint& pos, const wxSize& size, const long style):
    wxTextCtrl(frame, wxID_ANY, _T(""), pos, size, style)
{
    view = v;
}