wxWidgets/samples/caret/caret.cpp

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/////////////////////////////////////////////////////////////////////////////
// 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(__WXX11__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__)
#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 SetFontSize(int fontSize);
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();
// update the geometry
void ChangeSize();
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 OnSetFontSize(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_SetFontSize,
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_SetFontSize, MyFrame::OnSetFontSize)
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(_T("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, _T("&Blink time...\tCtrl-B"));
menuFile->Append(Caret_SetFontSize, _T("&Font size...\tCtrl-S"));
menuFile->Append(Caret_Move, _T("&Move caret\tCtrl-C"));
menuFile->AppendSeparator();
menuFile->Append(Caret_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));
menuFile->AppendSeparator();
menuFile->Append(Caret_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
// now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar;
menuBar->Append(menuFile, _T("&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(_T("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))
{
wxMessageBox(_T("The caret wxWindows sample.\n<EFBFBD> 1999 Vadim Zeitlin"),
_T("About Caret"), wxOK | wxICON_INFORMATION, this);
}
void MyFrame::OnCaretMove(wxCommandEvent& WXUNUSED(event))
{
m_canvas->MoveCaret(10, 10);
}
void MyFrame::OnSetBlinkTime(wxCommandEvent& WXUNUSED(event))
{
long blinkTime = wxGetNumberFromUser
(
_T("The caret blink time is the time between two blinks"),
_T("Time in milliseconds:"),
_T("wxCaret sample"),
wxCaret::GetBlinkTime(), 0, 10000,
this
);
if ( blinkTime != -1 )
{
wxCaret::SetBlinkTime((int)blinkTime);
m_canvas->CreateCaret();
wxLogStatus(this, _T("Blink time set to %ld milliseconds."), blinkTime);
}
}
void MyFrame::OnSetFontSize(wxCommandEvent& WXUNUSED(event))
{
long fontSize = wxGetNumberFromUser
(
_T("The font size also determines the caret size so\n"
"this demonstrates resizing the caret."),
_T("Font size (in points):"),
_T("wxCaret sample"),
12, 1, 100,
this
);
if ( fontSize != -1 )
{
m_canvas->SetFontSize((int)fontSize);
}
}
// ----------------------------------------------------------------------------
// MyCanvas
// ----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
EVT_PAINT(MyCanvas::OnPaint)
EVT_SIZE(MyCanvas::OnSize)
EVT_CHAR(MyCanvas::OnChar)
END_EVENT_TABLE()
MyCanvas::MyCanvas( wxWindow *parent )
: wxScrolledWindow( parent, -1,
wxDefaultPosition, wxDefaultSize,
wxSUNKEN_BORDER )
{
m_text = (wxChar *)NULL;
SetBackgroundColour(*wxWHITE);
SetFontSize(12);
m_xCaret = m_yCaret =
m_xChars = m_yChars = 0;
m_xMargin = m_yMargin = 5;
CreateCaret();
}
MyCanvas::~MyCanvas()
{
free(m_text);
}
void MyCanvas::CreateCaret()
{
wxCaret *caret = new wxCaret(this, m_widthChar, m_heightChar);
SetCaret(caret);
caret->Move(m_xMargin, m_yMargin);
caret->Show();
}
void MyCanvas::SetFontSize(int fontSize)
{
m_font = wxFont(fontSize, wxFONTFAMILY_TELETYPE,
wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
wxClientDC dc(this);
dc.SetFont(m_font);
m_heightChar = dc.GetCharHeight();
m_widthChar = dc.GetCharWidth();
wxCaret *caret = GetCaret();
if ( caret )
{
caret->SetSize(m_widthChar, m_heightChar);
ChangeSize();
}
}
void MyCanvas::MoveCaret(int x, int y)
{
m_xCaret = x;
m_yCaret = y;
DoMoveCaret();
}
void MyCanvas::DoMoveCaret()
{
wxLogStatus(_T("Caret is at (%d, %d)"), m_xCaret, m_yCaret);
GetCaret()->Move(m_xMargin + m_xCaret * m_widthChar,
m_yMargin + m_yCaret * m_heightChar);
}
void MyCanvas::OnSize(wxSizeEvent& event)
{
ChangeSize();
event.Skip();
}
void MyCanvas::ChangeSize()
{
wxSize size = GetClientSize();
m_xChars = (size.x - 2*m_xMargin) / m_widthChar;
m_yChars = (size.y - 2*m_yMargin) / m_heightChar;
if ( !m_xChars )
m_xChars = 1;
if ( !m_yChars )
m_yChars = 1;
free(m_text);
m_text = (wxChar *)calloc(m_xChars * m_yChars, sizeof(wxChar));
wxFrame *frame = wxDynamicCast(GetParent(), wxFrame);
if ( frame && frame->GetStatusBar() )
{
wxString msg;
msg.Printf(_T("Panel size is (%d, %d)"), m_xChars, m_yChars);
frame->SetStatusText(msg, 1);
}
}
// NB: this method is horrible inefficient especially because the caret
// needs to be redrawn often and in this case we only have to redraw
// the caret location and not the entire window - in a real program we
// would use GetUpdateRegion() and iterate over rectangles it contains
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
wxCaretSuspend cs(this);
wxPaintDC dc( this );
PrepareDC( dc );
dc.Clear();
dc.SetFont( m_font );
for ( int y = 0; y < m_yChars; y++ )
{
wxString line;
for ( int x = 0; x < m_xChars; x++ )
{
wxChar ch = CharAt(x, y);
if ( !ch )
ch = _T(' ');
line += ch;
}
dc.DrawText( line, m_xMargin, m_yMargin + y * m_heightChar );
}
}
void MyCanvas::OnChar( wxKeyEvent &event )
{
switch ( event.GetKeyCode() )
{
case WXK_LEFT:
PrevChar();
break;
case WXK_RIGHT:
NextChar();
break;
case WXK_UP:
PrevLine();
break;
case WXK_DOWN:
NextLine();
break;
case WXK_HOME:
Home();
break;
case WXK_END:
End();
break;
case WXK_RETURN:
Home();
NextLine();
break;
default:
if ( !event.AltDown() && wxIsprint(event.GetKeyCode()) )
{
wxChar ch = (wxChar)event.GetKeyCode();
CharAt(m_xCaret, m_yCaret) = ch;
wxCaretSuspend cs(this);
wxClientDC dc(this);
dc.SetFont(m_font);
dc.SetBackgroundMode(wxSOLID); // overwrite old value
dc.DrawText(ch, m_xMargin + m_xCaret * m_widthChar,
m_yMargin + m_yCaret * m_heightChar );
NextChar();
}
else
{
event.Skip();
}
}
DoMoveCaret();
}