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 void 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     }
  74 };
  75
  76 // To use a different renderer from the very beginning we must override
  77 // wxAppTraits method creating the renderer (another, simpler, alternative is
  78 // to call wxRendererNative::Set() a.s.a.p. which should work in 99% of the
  79 // cases, but we show this here just for completeness)
  80 class MyTraits : public wxGUIAppTraits
  81 {
  82     virtual wxRendererNative *CreateRenderer()
  83     {
  84         // it will be deleted on program shutdown by wxWidgets itself
  85         return new MyRenderer;
  86     }
  87 };
  88
  89 // Define a new application type, each program should derive a class from wxApp
  90 class MyApp : public wxApp
  91 {
  92 public:
  93     virtual bool OnInit();
  94
  95     // if we want MyTraits to be used we must override CreateTraits()
  96     virtual wxAppTraits *CreateTraits() { return new MyTraits; }
  97 };
  98
  99 // Define a new frame type: this is going to be our main frame
 100 class MyFrame : public wxFrame
 101 {
 102 public:
 103     // ctor(s)
 104     MyFrame();
 105     virtual ~MyFrame();
 106
 107     // event handlers (these functions should _not_ be virtual)
 108 #if wxUSE_DYNLIB_CLASS
 109     void OnLoad(wxCommandEvent& event);
 110     void OnUnload(wxCommandEvent& event);
 111 #endif // wxUSE_DYNLIB_CLASS
 112     void OnQuit(wxCommandEvent& event);
 113     void OnAbout(wxCommandEvent& event);
 114
 115 private:
 116     wxPanel *m_panel;
 117
 118     // any class wishing to process wxWidgets events must use this macro
 119     DECLARE_EVENT_TABLE()
 120 };
 121
 122 // a very simple class just to have something to draw on
 123 class MyPanel : public wxPanel
 124 {
 125 public:
 126     MyPanel(wxWindow *parent) : wxPanel(parent) { }
 127
 128     void OnPaint(wxPaintEvent&)
 129     {
 130         wxPaintDC dc(this);
 131
 132         dc.DrawText(_T("Below is the standard header button drawn"), 10, 10);
 133         dc.DrawText(_T("using the current renderer:"), 10, 40);
 134
 135         wxRendererNative::Get().DrawHeaderButton(this, dc,
 136                                                  wxRect(20, 70, 100, 60));
 137     }
 138
 139     DECLARE_EVENT_TABLE()
 140 };
 141
 142 BEGIN_EVENT_TABLE(MyPanel, wxPanel)
 143     EVT_PAINT(MyPanel::OnPaint)
 144 END_EVENT_TABLE()
 145
 146 // ----------------------------------------------------------------------------
 147 // constants
 148 // ----------------------------------------------------------------------------
 149
 150 // IDs for the controls and the menu commands
 151 enum
 152 {
 153     // our menu items
 154 #if wxUSE_DYNLIB_CLASS
 155     Render_Load = 100,
 156     Render_Unload,
 157 #endif // wxUSE_DYNLIB_CLASS
 158
 159     // standard menu items
 160     Render_Quit = wxID_EXIT,
 161
 162     // it is important for the id corresponding to the "About" command to have
 163     // this standard value as otherwise it won't be handled properly under Mac
 164     // (where it is special and put into the "Apple" menu)
 165     Render_About = wxID_ABOUT
 166 };
 167
 168 // ----------------------------------------------------------------------------
 169 // event tables and other macros for wxWidgets
 170 // ----------------------------------------------------------------------------
 171
 172 // the event tables connect the wxWidgets events with the functions (event
 173 // handlers) which process them. It can be also done at run-time, but for the
 174 // simple menu events like this the static method is much simpler.
 175 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 176 #if wxUSE_DYNLIB_CLASS
 177     EVT_MENU(Render_Load,  MyFrame::OnLoad)
 178     EVT_MENU(Render_Unload,MyFrame::OnUnload)
 179 #endif // wxUSE_DYNLIB_CLASS
 180     EVT_MENU(Render_Quit,  MyFrame::OnQuit)
 181
 182     EVT_MENU(Render_About, MyFrame::OnAbout)
 183 END_EVENT_TABLE()
 184
 185 // Create a new application object: this macro will allow wxWidgets to create
 186 // the application object during program execution (it's better than using a
 187 // static object for many reasons) and also implements the accessor function
 188 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 189 // not wxApp)
 190 IMPLEMENT_APP(MyApp)
 191
 192 // ============================================================================
 193 // implementation
 194 // ============================================================================
 195
 196 // ----------------------------------------------------------------------------
 197 // the application class
 198 // ----------------------------------------------------------------------------
 199
 200 // 'Main program' equivalent: the program execution "starts" here
 201 bool MyApp::OnInit()
 202 {
 203     // create the main application window
 204     new MyFrame;
 205
 206     return true;
 207 }
 208
 209 // ----------------------------------------------------------------------------
 210 // main frame
 211 // ----------------------------------------------------------------------------
 212
 213 // frame constructor
 214 MyFrame::MyFrame()
 215        : wxFrame(NULL,
 216                  wxID_ANY,
 217                  _T("Render wxWidgets Sample"),
 218                  wxPoint(50, 50),
 219                  wxSize(450, 340))
 220 {
 221     // set the frame icon
 222     SetIcon(wxICON(sample));
 223
 224 #if wxUSE_MENUS
 225     // create a menu bar
 226     wxMenu *menuFile = new wxMenu;
 227 #if wxUSE_DYNLIB_CLASS
 228     menuFile->Append(Render_Load, _T("&Load renderer...\tCtrl-L"));
 229     menuFile->Append(Render_Unload, _T("&Unload renderer\tCtrl-U"));
 230 #endif // wxUSE_DYNLIB_CLASS
 231     menuFile->Append(Render_Quit, _T("E&xit\tCtrl-Q"), _T("Quit this program"));
 232
 233     // the "About" item should be in the help menu
 234     wxMenu *helpMenu = new wxMenu;
 235     helpMenu->Append(Render_About, _T("&About...\tF1"), _T("Show about dialog"));
 236
 237     // now append the freshly created menu to the menu bar...
 238     wxMenuBar *menuBar = new wxMenuBar();
 239     menuBar->Append(menuFile, _T("&File"));
 240     menuBar->Append(helpMenu, _T("&Help"));
 241
 242     // ... and attach this menu bar to the frame
 243     SetMenuBar(menuBar);
 244 #endif // wxUSE_MENUS
 245
 246     m_panel = new MyPanel(this);
 247
 248 #if wxUSE_STATUSBAR
 249     // create a status bar just for fun (by default with 1 pane only)
 250     CreateStatusBar(2);
 251     SetStatusText(_T("Welcome to wxWidgets!"));
 252 #endif // wxUSE_STATUSBAR
 253
 254     Show();
 255 }
 256
 257 MyFrame::~MyFrame()
 258 {
 259     delete wxRendererNative::Set(NULL);
 260 }
 261
 262
 263 // event handlers
 264
 265 #if wxUSE_DYNLIB_CLASS
 266
 267 void MyFrame::OnLoad(wxCommandEvent& WXUNUSED(event))
 268 {
 269     static wxString s_name = _T("renddll");
 270
 271     wxString name = wxGetTextFromUser
 272                     (
 273                         _T("Name of the renderer to load:"),
 274                         _T("Render wxWidgets Sample"),
 275                         s_name,
 276                         this
 277                     );
 278     if ( name.empty() )
 279     {
 280         // cancelled
 281         return;
 282     }
 283
 284     s_name = name;
 285
 286     wxRendererNative *renderer = wxRendererNative::Load(name);
 287     if ( !renderer )
 288     {
 289         wxLogError(_T("Failed to load renderer \"%s\"."), name.c_str());
 290     }
 291     else // loaded ok
 292     {
 293         delete wxRendererNative::Set(renderer);
 294
 295         m_panel->Refresh();
 296
 297         wxLogStatus(this, _T("Successfully loaded the renderer \"%s\"."),
 298                     name.c_str());
 299     }
 300 }
 301
 302 void MyFrame::OnUnload(wxCommandEvent& WXUNUSED(event))
 303 {
 304     wxRendererNative *renderer = wxRendererNative::Set(NULL);
 305     if ( renderer )
 306     {
 307         delete renderer;
 308
 309         m_panel->Refresh();
 310
 311         wxLogStatus(this, _T("Unloaded the previously loaded renderer."));
 312     }
 313     else
 314     {
 315         wxLogWarning(_T("No renderer to unload."));
 316     }
 317 }
 318
 319 #endif // wxUSE_DYNLIB_CLASS
 320
 321 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 322 {
 323     // true is to force the frame to close
 324     Close(true);
 325 }
 326
 327 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 328 {
 329     wxMessageBox(_T("Render sample shows how to use custom renderers.\n")
 330                  _T("\n")
 331                  _T("(c) 2003 Vadim Zeitlin"),
 332                  _T("About Render wxWidgets Sample"),
 333                  wxOK | wxICON_INFORMATION, this);
 334 }
 335