samples/render/render.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        render.cpp
   3 // Purpose:     Render wxWidgets sample
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04.08.03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/app.h"
  29     #include "wx/frame.h"
  30     #include "wx/dc.h"
  31     #include "wx/dcclient.h"
  32     #include "wx/panel.h"
  33     #include "wx/menu.h"
  34     #include "wx/textdlg.h"
  35     #include "wx/log.h"
  36     #include "wx/msgdlg.h"
  37     #include "wx/icon.h"
  38 #endif
  39
  40 #include "wx/apptrait.h"
  41 #include "wx/renderer.h"
  42
  43 // ----------------------------------------------------------------------------
  44 // resources
  45 // ----------------------------------------------------------------------------
  46
  47 // the application icon (under Windows and OS/2 it is in resources)
  48 #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
  49     #include "../sample.xpm"
  50 #endif
  51
  52 // ----------------------------------------------------------------------------
  53 // private classes
  54 // ----------------------------------------------------------------------------
  55
  56 // A renderer class draws the header buttons in a "special" way
  57 class MyRenderer : public wxDelegateRendererNative
  58 {
  59 public:
  60     MyRenderer() : wxDelegateRendererNative(wxRendererNative::GetDefault()) { }
  61
  62     virtual int DrawHeaderButton(wxWindow *WXUNUSED(win),
  63                                   wxDC& dc,
  64                                   const wxRect& rect,
  65                                   int WXUNUSED(flags) = 0,
  66                                   wxHeaderSortIconType WXUNUSED(sortArrow) = wxHDR_SORT_ICON_NONE,
  67                                   wxHeaderButtonParams* WXUNUSED(params) = NULL)
  68     {
  69         dc.SetBrush(*wxBLUE_BRUSH);
  70         dc.SetTextForeground(*wxWHITE);
  71         dc.DrawRoundedRectangle(rect, 5);
  72         dc.DrawLabel(_T("MyRenderer"), wxNullBitmap, rect, wxALIGN_CENTER);
  73         return rect.width;
  74     }
  75 };
  76
  77 // To use a different renderer from the very beginning we must override
  78 // wxAppTraits method creating the renderer (another, simpler, alternative is
  79 // to call wxRendererNative::Set() a.s.a.p. which should work in 99% of the
  80 // cases, but we show this here just for completeness)
  81 class MyTraits : public wxGUIAppTraits
  82 {
  83     virtual wxRendererNative *CreateRenderer()
  84     {
  85         // it will be deleted on program shutdown by wxWidgets itself
  86         return new MyRenderer;
  87     }
  88 };
  89
  90 // Define a new application type, each program should derive a class from wxApp
  91 class MyApp : public wxApp
  92 {
  93 public:
  94     virtual bool OnInit();
  95
  96     // if we want MyTraits to be used we must override CreateTraits()
  97     virtual wxAppTraits *CreateTraits() { return new MyTraits; }
  98 };
  99
 100 // Define a new frame type: this is going to be our main frame
 101 class MyFrame : public wxFrame
 102 {
 103 public:
 104     // ctor(s)
 105     MyFrame();
 106     virtual ~MyFrame();
 107
 108     // event handlers (these functions should _not_ be virtual)
 109 #if wxUSE_DYNLIB_CLASS
 110     void OnLoad(wxCommandEvent& event);
 111     void OnUnload(wxCommandEvent& event);
 112 #endif // wxUSE_DYNLIB_CLASS
 113     void OnQuit(wxCommandEvent& event);
 114     void OnAbout(wxCommandEvent& event);
 115
 116 private:
 117     wxPanel *m_panel;
 118
 119     // any class wishing to process wxWidgets events must use this macro
 120     DECLARE_EVENT_TABLE()
 121 };
 122
 123 // a very simple class just to have something to draw on
 124 class MyPanel : public wxPanel
 125 {
 126 public:
 127     MyPanel(wxWindow *parent) : wxPanel(parent) { }
 128
 129     void OnPaint(wxPaintEvent&)
 130     {
 131         wxPaintDC dc(this);
 132
 133         dc.DrawText(_T("Below is the standard header button drawn"), 10, 10);
 134         dc.DrawText(_T("using the current renderer:"), 10, 40);
 135
 136         wxRendererNative::Get().DrawHeaderButton(this, dc,
 137                                                  wxRect(20, 70, 100, 60));
 138     }
 139
 140     DECLARE_EVENT_TABLE()
 141 };
 142
 143 BEGIN_EVENT_TABLE(MyPanel, wxPanel)
 144     EVT_PAINT(MyPanel::OnPaint)
 145 END_EVENT_TABLE()
 146
 147 // ----------------------------------------------------------------------------
 148 // constants
 149 // ----------------------------------------------------------------------------
 150
 151 // IDs for the controls and the menu commands
 152 enum
 153 {
 154     // our menu items
 155 #if wxUSE_DYNLIB_CLASS
 156     Render_Load = 100,
 157     Render_Unload,
 158 #endif // wxUSE_DYNLIB_CLASS
 159
 160     // standard menu items
 161     Render_Quit = wxID_EXIT,
 162
 163     // it is important for the id corresponding to the "About" command to have
 164     // this standard value as otherwise it won't be handled properly under Mac
 165     // (where it is special and put into the "Apple" menu)
 166     Render_About = wxID_ABOUT
 167 };
 168
 169 // ----------------------------------------------------------------------------
 170 // event tables and other macros for wxWidgets
 171 // ----------------------------------------------------------------------------
 172
 173 // the event tables connect the wxWidgets events with the functions (event
 174 // handlers) which process them. It can be also done at run-time, but for the
 175 // simple menu events like this the static method is much simpler.
 176 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 177 #if wxUSE_DYNLIB_CLASS
 178     EVT_MENU(Render_Load,  MyFrame::OnLoad)
 179     EVT_MENU(Render_Unload,MyFrame::OnUnload)
 180 #endif // wxUSE_DYNLIB_CLASS
 181     EVT_MENU(Render_Quit,  MyFrame::OnQuit)
 182
 183     EVT_MENU(Render_About, MyFrame::OnAbout)
 184 END_EVENT_TABLE()
 185
 186 // Create a new application object: this macro will allow wxWidgets to create
 187 // the application object during program execution (it's better than using a
 188 // static object for many reasons) and also implements the accessor function
 189 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 190 // not wxApp)
 191 IMPLEMENT_APP(MyApp)
 192
 193 // ============================================================================
 194 // implementation
 195 // ============================================================================
 196
 197 // ----------------------------------------------------------------------------
 198 // the application class
 199 // ----------------------------------------------------------------------------
 200
 201 // 'Main program' equivalent: the program execution "starts" here
 202 bool MyApp::OnInit()
 203 {
 204     if ( !wxApp::OnInit() )
 205         return false;
 206
 207     // create the main application window
 208     new MyFrame;
 209
 210     return true;
 211 }
 212
 213 // ----------------------------------------------------------------------------
 214 // main frame
 215 // ----------------------------------------------------------------------------
 216
 217 // frame constructor
 218 MyFrame::MyFrame()
 219        : wxFrame(NULL,
 220                  wxID_ANY,
 221                  _T("Render wxWidgets Sample"),
 222                  wxPoint(50, 50),
 223                  wxSize(450, 340))
 224 {
 225     // set the frame icon
 226     SetIcon(wxICON(sample));
 227
 228 #if wxUSE_MENUS
 229     // create a menu bar
 230     wxMenu *menuFile = new wxMenu;
 231 #if wxUSE_DYNLIB_CLASS
 232     menuFile->Append(Render_Load, _T("&Load renderer...\tCtrl-L"));
 233     menuFile->Append(Render_Unload, _T("&Unload renderer\tCtrl-U"));
 234 #endif // wxUSE_DYNLIB_CLASS
 235     menuFile->Append(Render_Quit, _T("E&xit\tCtrl-Q"), _T("Quit this program"));
 236
 237     // the "About" item should be in the help menu
 238     wxMenu *helpMenu = new wxMenu;
 239     helpMenu->Append(Render_About, _T("&About...\tF1"), _T("Show about dialog"));
 240
 241     // now append the freshly created menu to the menu bar...
 242     wxMenuBar *menuBar = new wxMenuBar();
 243     menuBar->Append(menuFile, _T("&File"));
 244     menuBar->Append(helpMenu, _T("&Help"));
 245
 246     // ... and attach this menu bar to the frame
 247     SetMenuBar(menuBar);
 248 #endif // wxUSE_MENUS
 249
 250     m_panel = new MyPanel(this);
 251
 252 #if wxUSE_STATUSBAR
 253     // create a status bar just for fun (by default with 1 pane only)
 254     CreateStatusBar(2);
 255     SetStatusText(_T("Welcome to wxWidgets!"));
 256 #endif // wxUSE_STATUSBAR
 257
 258     Show();
 259 }
 260
 261 MyFrame::~MyFrame()
 262 {
 263     delete wxRendererNative::Set(NULL);
 264 }
 265
 266
 267 // event handlers
 268
 269 #if wxUSE_DYNLIB_CLASS
 270
 271 void MyFrame::OnLoad(wxCommandEvent& WXUNUSED(event))
 272 {
 273     static wxString s_name = _T("renddll");
 274
 275     wxString name = wxGetTextFromUser
 276                     (
 277                         _T("Name of the renderer to load:"),
 278                         _T("Render wxWidgets Sample"),
 279                         s_name,
 280                         this
 281                     );
 282     if ( name.empty() )
 283     {
 284         // cancelled
 285         return;
 286     }
 287
 288     s_name = name;
 289
 290     wxRendererNative *renderer = wxRendererNative::Load(name);
 291     if ( !renderer )
 292     {
 293         wxLogError(_T("Failed to load renderer \"%s\"."), name.c_str());
 294     }
 295     else // loaded ok
 296     {
 297         delete wxRendererNative::Set(renderer);
 298
 299         m_panel->Refresh();
 300
 301         wxLogStatus(this, _T("Successfully loaded the renderer \"%s\"."),
 302                     name.c_str());
 303     }
 304 }
 305
 306 void MyFrame::OnUnload(wxCommandEvent& WXUNUSED(event))
 307 {
 308     wxRendererNative *renderer = wxRendererNative::Set(NULL);
 309     if ( renderer )
 310     {
 311         delete renderer;
 312
 313         m_panel->Refresh();
 314
 315         wxLogStatus(this, _T("Unloaded the previously loaded renderer."));
 316     }
 317     else
 318     {
 319         wxLogWarning(_T("No renderer to unload."));
 320     }
 321 }
 322
 323 #endif // wxUSE_DYNLIB_CLASS
 324
 325 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 326 {
 327     // true is to force the frame to close
 328     Close(true);
 329 }
 330
 331 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 332 {
 333     wxMessageBox(_T("Render sample shows how to use custom renderers.\n")
 334                  _T("\n")
 335                  _T("(c) 2003 Vadim Zeitlin"),
 336                  _T("About Render wxWidgets Sample"),
 337                  wxOK | wxICON_INFORMATION, this);
 338 }
 339