Added test to prevent crash in LogMenuEvent

[wxWidgets.git] / samples / caret / caret.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        caret.cpp
// Purpose:     wxCaret sample
// Author:      Robert Roebling
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) wxWindows team
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all <standard< wxWindows headers
#ifndef WX_PRECOMP
    #include <wx/wx.h>

    #include <wx/log.h>
#endif

#include "wx/caret.h"

// ----------------------------------------------------------------------------
// ressources
// ----------------------------------------------------------------------------
// the application icon
#if defined(__WXGTK__) || defined(__WXMOTIF__)
    #include "mondrian.xpm"
#endif

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
    virtual bool OnInit();
};

// MyCanvas is a canvas on which you can type
class MyCanvas: public wxScrolledWindow
{
public:
    MyCanvas() { }
    MyCanvas( wxWindow *parent );
    ~MyCanvas();

    wxChar& CharAt(int x, int y) { return *(m_text + x + m_xChars * y); }

    // operations
    void CreateCaret();
    void MoveCaret(int x, int y);

    // caret movement
    void Home() { m_xCaret = 0; }
    void End() { m_xCaret = m_xChars - 1; }
    void FirstLine() { m_yCaret = 0; }
    void LastLine() { m_yCaret = m_yChars - 1; }
    void PrevChar() { if ( !m_xCaret-- ) { End(); PrevLine(); } }
    void NextChar() { if ( ++m_xCaret == m_xChars ) { Home(); NextLine(); } }
    void PrevLine() { if ( !m_yCaret-- ) LastLine(); }
    void NextLine() { if ( ++m_yCaret == m_yChars ) FirstLine(); }

    // event handlers
    void OnPaint( wxPaintEvent &event );
    void OnSize( wxSizeEvent &event );
    void OnChar( wxKeyEvent &event );

private:
    // move the caret to m_xCaret, m_yCaret
    void DoMoveCaret();

    wxFont   m_font;

    // the margin around the text (looks nicer)
    int      m_xMargin, m_yMargin;

    // size (in pixels) of one character
    long     m_widthChar, m_heightChar;

    // position (in text coords) of the caret
    int      m_xCaret, m_yCaret;

    // the size (in text coords) of the window
    int      m_xChars, m_yChars;

    // the text
    wxChar  *m_text;

    DECLARE_DYNAMIC_CLASS(MyCanvas)
    DECLARE_EVENT_TABLE()
};


// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
    // ctor(s)
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

    // event handlers (these functions should _not_ be virtual)
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
    void OnSetBlinkTime(wxCommandEvent& event);
    void OnCaretMove(wxCommandEvent& event);

private:
    MyCanvas *m_canvas;

    // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
};

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// IDs for the controls and the menu commands
enum
{
    // menu items
    Caret_Quit = 1,
    Caret_About,
    Caret_SetBlinkTime,
    Caret_Move,

    // controls start here (the numbers are, of course, arbitrary)
    Caret_Text = 1000
};

// ----------------------------------------------------------------------------
// event tables and other macros for wxWindows
// ----------------------------------------------------------------------------

// the event tables connect the wxWindows events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
    EVT_MENU(Caret_Quit,  MyFrame::OnQuit)
    EVT_MENU(Caret_About, MyFrame::OnAbout)
    EVT_MENU(Caret_SetBlinkTime, MyFrame::OnSetBlinkTime)
    EVT_MENU(Caret_Move, MyFrame::OnCaretMove)
END_EVENT_TABLE()

// Create a new application object: this macro will allow wxWindows to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also declares the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------

// `Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
    // create and show the main application window
    MyFrame *frame = new MyFrame("Caret wxWindows sample",
                                 wxPoint(50, 50), wxSize(450, 340));

    frame->Show(TRUE);

    // success: wxApp::OnRun() will be called which will enter the main message
    // loop and the application will run. If we returned FALSE here, the
    // application would exit immediately.
    return TRUE;
}

// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------

// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
       : wxFrame((wxFrame *)NULL, -1, title, pos, size)
{
    // set the frame icon
    SetIcon(wxICON(mondrian));

    // create a menu bar
    wxMenu *menuFile = new wxMenu;

    menuFile->Append(Caret_SetBlinkTime, "&Blink time...\tCtrl-B");
    menuFile->Append(Caret_Move, "&Move caret\tCtrl-C");
    menuFile->AppendSeparator();
    menuFile->Append(Caret_About, "&About...\tCtrl-A", "Show about dialog");
    menuFile->AppendSeparator();
    menuFile->Append(Caret_Quit, "E&xit\tAlt-X", "Quit this program");

    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar;
    menuBar->Append(menuFile, "&File");

    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);
    
    m_canvas = new MyCanvas(this);

    // create a status bar just for fun (by default with 1 pane only)
    CreateStatusBar(2);
    SetStatusText("Welcome to wxWindows!");
}


// event handlers

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    // TRUE is to force the frame to close
    Close(TRUE);
}

void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{