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& renderer = wxRendererNative::Get();
 137         const wxCoord height = renderer.GetHeaderButtonHeight(this);
 138
 139         renderer.DrawHeaderButton(this, dc, wxRect(20, 70, 100, height));
 140     }
 141
 142     DECLARE_EVENT_TABLE()
 143 };
 144
 145 BEGIN_EVENT_TABLE(MyPanel, wxPanel)
 146     EVT_PAINT(MyPanel::OnPaint)
 147 END_EVENT_TABLE()
 148
 149 // ----------------------------------------------------------------------------
 150 // constants
 151 // ----------------------------------------------------------------------------
 152
 153 // IDs for the controls and the menu commands
 154 enum
 155 {
 156     // our menu items
 157 #if wxUSE_DYNLIB_CLASS
 158     Render_Load = 100,
 159     Render_Unload,
 160 #endif // wxUSE_DYNLIB_CLASS
 161
 162     // standard menu items
 163     Render_Quit = wxID_EXIT,
 164
 165     // it is important for the id corresponding to the "About" command to have
 166     // this standard value as otherwise it won't be handled properly under Mac
 167     // (where it is special and put into the "Apple" menu)
 168     Render_About = wxID_ABOUT
 169 };
 170
 171 // ----------------------------------------------------------------------------
 172 // event tables and other macros for wxWidgets
 173 // ----------------------------------------------------------------------------
 174
 175 // the event tables connect the wxWidgets events with the functions (event
 176 // handlers) which process them. It can be also done at run-time, but for the
 177 // simple menu events like this the static method is much simpler.
 178 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 179 #if wxUSE_DYNLIB_CLASS
 180     EVT_MENU(Render_Load,  MyFrame::OnLoad)
 181     EVT_MENU(Render_Unload,MyFrame::OnUnload)
 182 #endif // wxUSE_DYNLIB_CLASS
 183     EVT_MENU(Render_Quit,  MyFrame::OnQuit)
 184
 185     EVT_MENU(Render_About, MyFrame::OnAbout)
 186 END_EVENT_TABLE()
 187
 188 // Create a new application object: this macro will allow wxWidgets to create
 189 // the application object during program execution (it's better than using a
 190 // static object for many reasons) and also implements the accessor function
 191 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 192 // not wxApp)
 193 IMPLEMENT_APP(MyApp)
 194
 195 // ============================================================================
 196 // implementation
 197 // ============================================================================
 198
 199 // ----------------------------------------------------------------------------
 200 // the application class
 201 // ----------------------------------------------------------------------------
 202
 203 // 'Main program' equivalent: the program execution "starts" here
 204 bool MyApp::OnInit()
 205 {
 206     if ( !wxApp::OnInit() )
 207         return false;
 208
 209     // create the main application window
 210     new MyFrame;
 211
 212     return true;
 213 }
 214
 215 // ----------------------------------------------------------------------------
 216 // main frame
 217 // ----------------------------------------------------------------------------
 218
 219 // frame constructor
 220 MyFrame::MyFrame()
 221        : wxFrame(NULL,
 222                  wxID_ANY,
 223                  _T("Render wxWidgets Sample"),
 224                  wxPoint(50, 50),
 225                  wxSize(450, 340))
 226 {
 227     // set the frame icon
 228     SetIcon(wxICON(sample));
 229
 230 #if wxUSE_MENUS
 231     // create a menu bar
 232     wxMenu *menuFile = new wxMenu;
 233 #if wxUSE_DYNLIB_CLASS
 234     menuFile->Append(Render_Load, _T("&Load renderer...\tCtrl-L"));
 235     menuFile->Append(Render_Unload, _T("&Unload renderer\tCtrl-U"));
 236 #endif // wxUSE_DYNLIB_CLASS
 237     menuFile->Append(Render_Quit, _T("E&xit\tCtrl-Q"), _T("Quit this program"));
 238
 239     // the "About" item should be in the help menu
 240     wxMenu *helpMenu = new wxMenu;
 241     helpMenu->Append(Render_About, _T("&About...\tF1"), _T("Show about dialog"));
 242
 243     // now append the freshly created menu to the menu bar...
 244     wxMenuBar *menuBar = new wxMenuBar();
 245     menuBar->Append(menuFile, _T("&File"));
 246     menuBar->Append(helpMenu, _T("&Help"));
 247
 248     // ... and attach this menu bar to the frame
 249     SetMenuBar(menuBar);
 250 #endif // wxUSE_MENUS
 251
 252     m_panel = new MyPanel(this);
 253
 254 #if wxUSE_STATUSBAR
 255     // create a status bar just for fun (by default with 1 pane only)
 256     CreateStatusBar(2);
 257     SetStatusText(_T("Welcome to wxWidgets!"));
 258 #endif // wxUSE_STATUSBAR
 259
 260     Show();
 261 }
 262
 263 MyFrame::~MyFrame()
 264 {
 265     delete wxRendererNative::Set(NULL);
 266 }
 267
 268
 269 // event handlers
 270
 271 #if wxUSE_DYNLIB_CLASS
 272
 273 void MyFrame::OnLoad(wxCommandEvent& WXUNUSED(event))
 274 {
 275     static wxString s_name = _T("renddll");
 276
 277     wxString name = wxGetTextFromUser
 278                     (
 279                         _T("Name of the renderer to load:"),
 280                         _T("Render wxWidgets Sample"),
 281                         s_name,
 282                         this
 283                     );
 284     if ( name.empty() )
 285     {
 286         // cancelled
 287         return;
 288     }
 289
 290     s_name = name;
 291
 292     wxRendererNative *renderer = wxRendererNative::Load(name);
 293     if ( !renderer )
 294     {
 295         wxLogError(_T("Failed to load renderer \"%s\"."), name.c_str());
 296     }
 297     else // loaded ok
 298     {
 299         delete wxRendererNative::Set(renderer);
 300
 301         m_panel->Refresh();
 302
 303         wxLogStatus(this, _T("Successfully loaded the renderer \"%s\"."),
 304                     name.c_str());
 305     }
 306 }
 307
 308 void MyFrame::OnUnload(wxCommandEvent& WXUNUSED(event))
 309 {
 310     wxRendererNative *renderer = wxRendererNative::Set(NULL);
 311     if ( renderer )
 312     {
 313         delete renderer;
 314
 315         m_panel->Refresh();
 316
 317         wxLogStatus(this, _T("Unloaded the previously loaded renderer."));
 318     }
 319     else
 320     {
 321         wxLogWarning(_T("No renderer to unload."));
 322     }
 323 }
 324
 325 #endif // wxUSE_DYNLIB_CLASS
 326
 327 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 328 {
 329     // true is to force the frame to close
 330     Close(true);
 331 }
 332
 333 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 334 {
 335     wxMessageBox(_T("Render sample shows how to use custom renderers.\n")
 336                  _T("\n")
 337                  _T("(c) 2003 Vadim Zeitlin"),
 338                  _T("About Render wxWidgets Sample"),
 339                  wxOK | wxICON_INFORMATION, this);
 340 }
 341