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7e67a05520
wxWidgets/samples/font/font.cpp
Vadim Zeitlin 7e67a05520 minor optical fix 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13153 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2001-12-21 19:54:40 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: font.cpp
// Purpose: wxFont demo
// Author: Vadim Zeitlin
// Modified by:
// Created: 30.09.99
// RCS-ID: $Id$
// Copyright: (c) 1999 Vadim Zeitlin
// 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/choicdlg.h"
#include "wx/fontdlg.h"
#include "wx/fontenum.h"
#include "wx/fontmap.h"
#include "wx/encconv.h"
#include "wx/splitter.h"
#include "wx/textfile.h"
// ----------------------------------------------------------------------------
// 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 we show the font sample
class MyCanvas: public wxWindow
{
public:
MyCanvas( wxWindow *parent );
~MyCanvas();
// accessors for the frame
const wxFont& GetTextFont() const { return m_font; }
const wxColour& GetColour() const { return m_colour; }
void SetTextFont(const wxFont& font) { m_font = font; }
void SetColour(const wxColour& colour) { m_colour = colour; }
// event handlers
void OnPaint( wxPaintEvent &event );
private:
wxColour m_colour;
wxFont m_font;
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);
// accessors
MyCanvas *GetCanvas() const { return m_canvas; }
// event handlers (these functions should _not_ be virtual)
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void OnIncFont(wxCommandEvent& event) { DoResizeFont(+2); }
void OnDecFont(wxCommandEvent& event) { DoResizeFont(-2); }
void OnViewMsg(wxCommandEvent& event);
void OnSelectFont(wxCommandEvent& event);
void OnEnumerateFamiliesForEncoding(wxCommandEvent& event);
void OnEnumerateFamilies(wxCommandEvent& WXUNUSED(event))
{ DoEnumerateFamilies(FALSE); }
void OnEnumerateFixedFamilies(wxCommandEvent& WXUNUSED(event))
{ DoEnumerateFamilies(TRUE); }
void OnEnumerateEncodings(wxCommandEvent& event);
void OnCheckNativeToFromString(wxCommandEvent& event);
protected:
bool DoEnumerateFamilies(bool fixedWidthOnly,
wxFontEncoding encoding = wxFONTENCODING_SYSTEM,
bool silent = FALSE);
void DoResizeFont(int diff);
void DoChangeFont(const wxFont& font, const wxColour& col = wxNullColour);
size_t m_fontSize; // in points
wxTextCtrl *m_textctrl;
MyCanvas *m_canvas;
private:
// 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
Font_Quit = 1,
Font_About,
Font_ViewMsg,
Font_IncSize,
Font_DecSize,
Font_Choose = 100,
Font_EnumFamiliesForEncoding,
Font_EnumFamilies,
Font_EnumFixedFamilies,
Font_EnumEncodings,
Font_CheckNativeToFromString,
Font_Max
};
// ----------------------------------------------------------------------------
// 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(Font_Quit, MyFrame::OnQuit)
EVT_MENU(Font_About, MyFrame::OnAbout)
EVT_MENU(Font_IncSize, MyFrame::OnIncFont)
EVT_MENU(Font_DecSize, MyFrame::OnDecFont)
EVT_MENU(Font_ViewMsg, MyFrame::OnViewMsg)
EVT_MENU(Font_Choose, MyFrame::OnSelectFont)
EVT_MENU(Font_EnumFamiliesForEncoding, MyFrame::OnEnumerateFamiliesForEncoding)
EVT_MENU(Font_EnumFamilies, MyFrame::OnEnumerateFamilies)
EVT_MENU(Font_EnumFixedFamilies, MyFrame::OnEnumerateFixedFamilies)
EVT_MENU(Font_EnumEncodings, MyFrame::OnEnumerateEncodings)
EVT_MENU(Font_CheckNativeToFromString, MyFrame::OnCheckNativeToFromString)
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 the main application window
MyFrame *frame = new MyFrame("Font wxWindows demo",
wxPoint(50, 50), wxSize(450, 340));
// Show it and tell the application that it's our main window
frame->Show(TRUE);
SetTopWindow(frame);
// 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), m_textctrl(NULL)
{
m_fontSize = 12;
// create a menu bar
wxMenu *menuFile = new wxMenu;
menuFile->Append(Font_ViewMsg, "&View...\tCtrl-V",
"View an email message file");
menuFile->AppendSeparator();
menuFile->Append(Font_About, "&About...\tCtrl-A", "Show about dialog");
menuFile->AppendSeparator();
menuFile->Append(Font_Quit, "E&xit\tAlt-X", "Quit this program");
wxMenu *menuFont = new wxMenu;
menuFont->Append(Font_IncSize, "&Increase font size by 2 points\tCtrl-I");
menuFont->Append(Font_DecSize, "&Decrease font size by 2 points\tCtrl-D");
menuFont->AppendSeparator();
menuFont->Append(Font_Choose, "&Select font...\tCtrl-S",
"Select a standard font");
menuFont->AppendSeparator();
menuFont->Append(Font_EnumFamilies, "Enumerate font &families\tCtrl-F");
menuFont->Append(Font_EnumFixedFamilies,
"Enumerate fi&xed font families\tCtrl-X");
menuFont->Append(Font_EnumEncodings,
"Enumerate &encodings\tCtrl-E");
menuFont->Append(Font_EnumFamiliesForEncoding,
"Find font for en&coding...\tCtrl-C",
"Find font families for given encoding");
menuFont->AppendSeparator();
menuFont->Append(Font_CheckNativeToFromString,
"Check Native Font Info To/From String");
// now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar;
menuBar->Append(menuFile, "&File");
menuBar->Append(menuFont, "F&ont");
// ... and attach this menu bar to the frame
SetMenuBar(menuBar);
wxSplitterWindow *splitter = new wxSplitterWindow(this);
m_textctrl = new wxTextCtrl(splitter, -1,
"Paste text here to see how it looks\n"
"like in the given font",
wxDefaultPosition, wxDefaultSize,
wxTE_MULTILINE);
m_canvas = new MyCanvas(splitter);
splitter->SplitHorizontally(m_textctrl, m_canvas, 100);
// create a status bar just for fun (by default with 1 pane only)
CreateStatusBar();
SetStatusText("Welcome to wxWindows font demo!");
}
// --------------------------------------------------------
class MyEncodingEnumerator : public wxFontEnumerator
{
public:
MyEncodingEnumerator()
{ m_n = 0; }
const wxString& GetText() const
{ return m_text; }
protected:
virtual bool OnFontEncoding(const wxString& facename,
const wxString& encoding)
{
wxString text;
text.Printf(wxT("Encoding %d: %s (available in facename '%s')\n"),
++m_n, encoding.c_str(), facename.c_str());
m_text += text;
return TRUE;
}
private:
size_t m_n;
wxString m_text;
};
void MyFrame::OnEnumerateEncodings(wxCommandEvent& WXUNUSED(event))
{
MyEncodingEnumerator fontEnumerator;
fontEnumerator.EnumerateEncodings();
wxLogMessage(wxT("Enumerating all available encodings:\n%s"),
fontEnumerator.GetText().c_str());
}
// -------------------------------------------------------------
class MyFontEnumerator : public wxFontEnumerator
{
public:
bool GotAny() const
{ return !m_facenames.IsEmpty(); }
const wxArrayString& GetFacenames() const
{ return m_facenames; }
protected:
virtual bool OnFacename(const wxString& facename)
{
m_facenames.Add(facename);
return TRUE;
}
private:
wxArrayString m_facenames;
} fontEnumerator;
bool MyFrame::DoEnumerateFamilies(bool fixedWidthOnly,
wxFontEncoding encoding,
bool silent)
{
MyFontEnumerator fontEnumerator;
fontEnumerator.EnumerateFacenames(encoding, fixedWidthOnly);
if ( fontEnumerator.GotAny() )
{
int nFacenames = fontEnumerator.GetFacenames().GetCount();
if ( !silent )
{
wxLogStatus(this, wxT("Found %d %sfonts"),
nFacenames, fixedWidthOnly ? wxT("fixed width ") : wxT(""));
}
wxString facename;
if ( silent )
{
// choose the first
facename = fontEnumerator.GetFacenames().Item(0);
}
else
{
// let the user choose
wxString *facenames = new wxString[nFacenames];
int n;
for ( n = 0; n < nFacenames; n++ )
facenames[n] = fontEnumerator.GetFacenames().Item(n);
n = wxGetSingleChoiceIndex("Choose a facename", "Font demo",
nFacenames, facenames, this);
if ( n != -1 )
facename = facenames[n];
delete [] facenames;
}
if ( !facename.IsEmpty() )
{
wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
wxFONTWEIGHT_NORMAL, FALSE, facename, encoding);
DoChangeFont(font);
}
return TRUE;
}
else if ( !silent )
{
wxLogWarning(wxT("No such fonts found."));
}
return FALSE;
}
void MyFrame::OnEnumerateFamiliesForEncoding(wxCommandEvent& WXUNUSED(event))
{
static wxFontEncoding encodings[] =
{
wxFONTENCODING_ISO8859_1,
wxFONTENCODING_ISO8859_2,
wxFONTENCODING_ISO8859_5,
wxFONTENCODING_ISO8859_7,
wxFONTENCODING_ISO8859_15,
wxFONTENCODING_KOI8,
wxFONTENCODING_CP1250,
wxFONTENCODING_CP1251,
wxFONTENCODING_CP1252,
};
static const wxString encodingNames[] =
{
"Western European (ISO-8859-1)",
"Central European (ISO-8859-2)",
"Cyrillic (ISO-8859-5)",
"Greek (ISO-8859-7)",
"Western European with Euro (ISO-8859-15)",
"KOI8-R",
"Windows Central European (CP 1250)",
"Windows Cyrillic (CP 1251)",
"Windows Western European (CP 1252)",
};
int n = wxGetSingleChoiceIndex("Choose an encoding", "Font demo",
WXSIZEOF(encodingNames),
encodingNames,
this);
if ( n != -1 )
{
DoEnumerateFamilies(FALSE, encodings[n]);
}
}
void MyFrame::OnCheckNativeToFromString(wxCommandEvent& WXUNUSED(event))
{
wxString fontInfo = m_canvas->GetTextFont().GetNativeFontInfoDesc();
if ( fontInfo.IsEmpty() )
{
wxLogError(wxT("Native font info string is empty!"));
}
else
{
wxFont *font = wxFont::New(fontInfo);
if ( fontInfo != font->GetNativeFontInfoDesc() )
wxLogError(wxT("wxNativeFontInfo ToString()/FromString() broken!"));
else
wxLogError(wxT("wxNativeFontInfo works: %s"), fontInfo.c_str());
delete font;
}
}
void MyFrame::DoResizeFont(int diff)
{
wxFont fontOld = m_canvas->GetTextFont();
DoChangeFont(
wxFont(
fontOld.GetPointSize() + diff,
fontOld.GetFamily(),
fontOld.GetStyle(),
fontOld.GetWeight(),
fontOld.GetUnderlined(),
fontOld.GetFaceName(),
fontOld.GetEncoding()
)
);
}
void MyFrame::DoChangeFont(const wxFont& font, const wxColour& col)
{
m_canvas->SetTextFont(font);
if ( col.Ok() )
m_canvas->SetColour(col);
m_canvas->Refresh();
m_textctrl->SetFont(font);
if ( col.Ok() )
m_textctrl->SetForegroundColour(col);
}
void MyFrame::OnSelectFont(wxCommandEvent& WXUNUSED(event))
{
wxFontData data;
data.SetInitialFont(m_canvas->GetTextFont());
data.SetColour(m_canvas->GetColour());
wxFontDialog dialog(this, &data);
if ( dialog.ShowModal() == wxID_OK )
{
wxFontData retData = dialog.GetFontData();
wxFont font = retData.GetChosenFont();
wxColour colour = retData.GetColour();
DoChangeFont(font, colour);
}
}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
// TRUE is to force the frame to close
Close(TRUE);
}
void MyFrame::OnViewMsg(wxCommandEvent& WXUNUSED(event))
{
// first, choose the file
static wxString s_dir, s_file;
wxFileDialog dialog(this, "Open an email message file",
s_dir, s_file);
if ( dialog.ShowModal() != wxID_OK )
return;
// save for the next time
s_dir = dialog.GetDirectory();
s_file = dialog.GetFilename();
wxString filename = dialog.GetPath();
// load it and search for Content-Type header
wxTextFile file(filename);
if ( !file.Open() )
return;
wxString charset;
static const char *prefix = "Content-Type: text/plain; charset=";
const size_t len = strlen(prefix);
size_t n, count = file.GetLineCount();
for ( n = 0; n < count; n++ )
{
wxString line = file[n];
if ( !line )
{
// if it is an email message, headers are over, no need to parse
// all the file
break;
}
if ( line.Left(len) == prefix )
{
// found!
const wxChar *pc = line.c_str() + len;
if ( *pc == '"' )
pc++;
while ( *pc && *pc != '"' )
{
charset += *pc++;
}
break;
}
}
if ( !charset )
{
wxLogError(wxT("The file '%s' doesn't contain charset information."),
filename.c_str());
return;
}
// ok, now get the corresponding encoding
wxFontEncoding fontenc = wxTheFontMapper->CharsetToEncoding(charset);
if ( fontenc == wxFONTENCODING_SYSTEM )
{
wxLogError(wxT("Charset '%s' is unsupported."), charset.c_str());
return;
}
m_textctrl->LoadFile(filename);
if ( fontenc == wxFONTENCODING_UTF8 ||
!wxTheFontMapper->IsEncodingAvailable(fontenc) )
{
// try to find some similar encoding:
wxFontEncoding encAlt;
if ( wxTheFontMapper->GetAltForEncoding(fontenc, &encAlt) )
{
wxEncodingConverter conv;
if (conv.Init(fontenc, encAlt))
{
fontenc = encAlt;
m_textctrl -> SetValue(conv.Convert(m_textctrl -> GetValue()));
}
else
{
wxLogWarning(wxT("Cannot convert from '%s' to '%s'."),
wxFontMapper::GetEncodingDescription(fontenc).c_str(),
wxFontMapper::GetEncodingDescription(encAlt).c_str());
}
}
else
wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
wxFontMapper::GetEncodingDescription(fontenc).c_str());
}
// and now create the correct font
if ( !DoEnumerateFamilies(FALSE, fontenc, TRUE /* silent */) )
{
wxFont font(12, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL,
wxFONTWEIGHT_NORMAL, FALSE /* !underlined */,
wxEmptyString /* facename */, fontenc);
if ( font.Ok() )
{
DoChangeFont(font);
}
else
{
wxLogWarning(wxT("No fonts for encoding '%s' on this system."),
wxFontMapper::GetEncodingDescription(fontenc).c_str());
}
}
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
wxMessageBox("wxWindows font demo\n"
"(c) 1999 Vadim Zeitlin",
"About Font",
wxOK | wxICON_INFORMATION, this);
}
// ----------------------------------------------------------------------------
// MyCanvas
// ----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyCanvas, wxWindow)
EVT_PAINT(MyCanvas::OnPaint)
END_EVENT_TABLE()
MyCanvas::MyCanvas( wxWindow *parent )
: wxWindow( parent, -1 ),
m_colour(*wxRED), m_font(*wxNORMAL_FONT)
{
}
MyCanvas::~MyCanvas()
{
}
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
wxPaintDC dc(this);
PrepareDC(dc);
// set background
dc.SetBackground(wxBrush(wxT("white"), wxSOLID));
dc.Clear();
// output the font name/info
wxString fontInfo;
fontInfo.Printf(wxT("Font size is %d points, family is %s, encoding is '%s', style %s, weight %s"),
m_font.GetPointSize(),
m_font.GetFamilyString().c_str(),
wxTheFontMapper->
GetEncodingDescription(m_font.GetEncoding()).c_str(),
m_font.GetStyleString().c_str(),
m_font.GetWeightString().c_str());
dc.DrawText(fontInfo, 5, 5);
if ( m_font.Ok() )
{
wxString fontDesc = m_font.GetNativeFontInfoDesc();
fontInfo.Printf(wxT("Native font info: %s"), fontDesc.c_str());
dc.DrawText(fontInfo, 5, 5 + dc.GetCharHeight());
}
// prepare to draw the font
dc.SetFont(m_font);
dc.SetTextForeground(m_colour);
// the size of one cell (char + small margin)
int w = dc.GetCharWidth() + 5,
h = dc.GetCharHeight() + 4;
// the origin for our table
int x = 5,
y = 2*h;
// print all font symbols from 32 to 256 in 7 rows of 32 chars each
for ( int i = 1; i < 8; i++ )
{
for ( int j = 0; j < 32; j++ )
{
dc.DrawText(wxChar(32*i + j), x + w*j, y + h*i);
}
}
// draw the lines between them
dc.SetPen(wxPen(wxColour("blue"), 1, wxSOLID));
int l;
// horizontal
y += h;
for ( l = 0; l < 8; l++ )
{
int yl = y + h*l - 2;
dc.DrawLine(x - 2, yl, x + 32*w - 2, yl);
}
// and vertical
for ( l = 0; l < 33; l++ )
{
int xl = x + w*l - 2;
dc.DrawLine(xl, y, xl, y + 7*h - 2);
}
}
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