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