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