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         wxDCBrushChanger setBrush(dc, *wxBLUE_BRUSH);
  70         wxDCTextColourChanger setFgCol(dc, *wxWHITE);
  71         dc.DrawRoundedRectangle(rect, 5);
  72         dc.DrawLabel(wxT("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 private:
 109     // event handlers (these functions should _not_ be virtual)
 110     void OnDrawDisabled(wxCommandEvent& event)
 111         { OnToggleDrawFlag(event, wxCONTROL_DISABLED); }
 112     void OnDrawFocused(wxCommandEvent& event)
 113         { OnToggleDrawFlag(event, wxCONTROL_FOCUSED); }
 114     void OnDrawPressed(wxCommandEvent& event)
 115         { OnToggleDrawFlag(event, wxCONTROL_PRESSED); }
 116     void OnDrawChecked(wxCommandEvent& event)
 117         { OnToggleDrawFlag(event, wxCONTROL_CHECKED); }
 118     void OnDrawHot(wxCommandEvent& event)
 119         { OnToggleDrawFlag(event, wxCONTROL_CURRENT); }
 120
 121 #if wxUSE_DYNLIB_CLASS
 122     void OnLoad(wxCommandEvent& event);
 123     void OnUnload(wxCommandEvent& event);
 124 #endif // wxUSE_DYNLIB_CLASS
 125     void OnQuit(wxCommandEvent& event);
 126     void OnAbout(wxCommandEvent& event);
 127
 128     void OnToggleDrawFlag(wxCommandEvent& event, int flag);
 129
 130     class MyPanel *m_panel;
 131
 132     // any class wishing to process wxWidgets events must use this macro
 133     DECLARE_EVENT_TABLE()
 134 };
 135
 136 // a very simple class just to have something to draw on
 137 class MyPanel : public wxPanel
 138 {
 139 public:
 140     MyPanel(wxWindow *parent) : wxPanel(parent) { m_flags = 0; }
 141
 142     int GetFlags() const { return m_flags; }
 143     void SetFlags(int flags) { m_flags = flags; }
 144
 145 private:
 146     void OnPaint(wxPaintEvent&)
 147     {
 148         wxPaintDC dc(this);
 149
 150         wxRendererNative& renderer = wxRendererNative::Get();
 151
 152         int x1 = 10,    // text offset
 153             x2 = 200,   // drawing offset
 154             y = 10;
 155
 156         const int lineHeight = dc.GetCharHeight();
 157         dc.DrawText("Demonstration of various wxRenderer functions:", x1, y);
 158         y += lineHeight;
 159         wxString flagsString;
 160         if ( m_flags & wxCONTROL_DISABLED )
 161             flagsString += "wxCONTROL_DISABLED ";
 162         if ( m_flags & wxCONTROL_FOCUSED )
 163             flagsString += "wxCONTROL_FOCUSED ";
 164         if ( m_flags & wxCONTROL_PRESSED )
 165             flagsString += "wxCONTROL_PRESSED ";
 166         if ( m_flags & wxCONTROL_CURRENT )
 167             flagsString += "wxCONTROL_CURRENT ";
 168         if ( m_flags & wxCONTROL_CHECKED )
 169             flagsString += "wxCONTROL_CHECKED ";
 170         if ( flagsString.empty() )
 171             flagsString = "(none)";
 172         dc.DrawText("Using flags: " + flagsString, x1, y);
 173         y += lineHeight*3;
 174
 175         dc.DrawText("DrawHeaderButton() (overridden)", x1, y);
 176         const wxCoord heightHdr = renderer.GetHeaderButtonHeight(this);
 177         renderer.DrawHeaderButton(this, dc,
 178                                   wxRect(x2, y, 100, heightHdr), m_flags);
 179         y += lineHeight + heightHdr;
 180
 181         dc.DrawText("DrawCheckBox()", x1, y);
 182         const wxSize sizeCheck = renderer.GetCheckBoxSize(this);
 183         renderer.DrawCheckBox(this, dc,
 184                               wxRect(wxPoint(x2, y), sizeCheck), m_flags);
 185         y += lineHeight + sizeCheck.y;
 186
 187         dc.DrawText("DrawRadioBitmap()", x1, y);
 188         renderer.DrawRadioBitmap(this, dc,
 189                                  wxRect(wxPoint(x2, y), sizeCheck), m_flags);
 190         y += lineHeight + sizeCheck.y;
 191
 192         dc.DrawText("DrawTreeItemButton()", x1, y);
 193         renderer.DrawTreeItemButton(this, dc,
 194                                     wxRect(x2, y, 20, 20), m_flags);
 195         y += lineHeight + 20;
 196     }
 197
 198     int m_flags;
 199
 200     DECLARE_EVENT_TABLE()
 201 };
 202
 203 BEGIN_EVENT_TABLE(MyPanel, wxPanel)
 204     EVT_PAINT(MyPanel::OnPaint)
 205 END_EVENT_TABLE()
 206
 207 // ----------------------------------------------------------------------------
 208 // constants
 209 // ----------------------------------------------------------------------------
 210
 211 // IDs for the controls and the menu commands
 212 enum
 213 {
 214     // our menu items
 215     Render_DrawDisabled = 100,
 216     Render_DrawFocused,
 217     Render_DrawPressed,
 218     Render_DrawChecked,
 219     Render_DrawHot,
 220
 221 #if wxUSE_DYNLIB_CLASS
 222     Render_Load,
 223     Render_Unload,
 224 #endif // wxUSE_DYNLIB_CLASS
 225
 226     // standard menu items
 227     Render_Quit = wxID_EXIT,
 228
 229     // it is important for the id corresponding to the "About" command to have
 230     // this standard value as otherwise it won't be handled properly under Mac
 231     // (where it is special and put into the "Apple" menu)
 232     Render_About = wxID_ABOUT
 233 };
 234
 235 // ----------------------------------------------------------------------------
 236 // event tables and other macros for wxWidgets
 237 // ----------------------------------------------------------------------------
 238
 239 // the event tables connect the wxWidgets events with the functions (event
 240 // handlers) which process them. It can be also done at run-time, but for the
 241 // simple menu events like this the static method is much simpler.
 242 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 243     EVT_MENU(Render_DrawDisabled, MyFrame::OnDrawDisabled)
 244     EVT_MENU(Render_DrawFocused, MyFrame::OnDrawFocused)
 245     EVT_MENU(Render_DrawPressed, MyFrame::OnDrawPressed)
 246     EVT_MENU(Render_DrawChecked, MyFrame::OnDrawChecked)
 247     EVT_MENU(Render_DrawHot, MyFrame::OnDrawHot)
 248
 249 #if wxUSE_DYNLIB_CLASS
 250     EVT_MENU(Render_Load,  MyFrame::OnLoad)
 251     EVT_MENU(Render_Unload,MyFrame::OnUnload)
 252 #endif // wxUSE_DYNLIB_CLASS
 253     EVT_MENU(Render_Quit,  MyFrame::OnQuit)
 254
 255     EVT_MENU(Render_About, MyFrame::OnAbout)
 256 END_EVENT_TABLE()
 257
 258 // Create a new application object: this macro will allow wxWidgets to create
 259 // the application object during program execution (it's better than using a
 260 // static object for many reasons) and also implements the accessor function
 261 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 262 // not wxApp)
 263 IMPLEMENT_APP(MyApp)
 264
 265 // ============================================================================
 266 // implementation
 267 // ============================================================================
 268
 269 // ----------------------------------------------------------------------------
 270 // the application class
 271 // ----------------------------------------------------------------------------
 272
 273 // 'Main program' equivalent: the program execution "starts" here
 274 bool MyApp::OnInit()
 275 {
 276     if ( !wxApp::OnInit() )
 277         return false;
 278
 279     // create the main application window
 280     new MyFrame;
 281
 282     return true;
 283 }
 284
 285 // ----------------------------------------------------------------------------
 286 // main frame
 287 // ----------------------------------------------------------------------------
 288
 289 // frame constructor
 290 MyFrame::MyFrame()
 291        : wxFrame(NULL,
 292                  wxID_ANY,
 293                  wxT("Render wxWidgets Sample"),
 294                  wxPoint(50, 50),
 295                  wxSize(450, 340))
 296 {
 297     // set the frame icon
 298     SetIcon(wxICON(sample));
 299
 300 #if wxUSE_MENUS
 301     // create a menu bar
 302     wxMenu *menuFile = new wxMenu;
 303     menuFile->AppendCheckItem(Render_DrawDisabled,
 304                               "Draw in &disabled state\tCtrl-D");
 305     menuFile->AppendCheckItem(Render_DrawFocused,
 306                               "Draw in &focused state\tCtrl-F");
 307     menuFile->AppendCheckItem(Render_DrawPressed,
 308                               "Draw in &pressed state\tCtrl-P");
 309     menuFile->AppendCheckItem(Render_DrawChecked,
 310                               "Draw in &checked state\tCtrl-C");
 311     menuFile->AppendCheckItem(Render_DrawHot,
 312                               "Draw in &hot state\tCtrl-H");
 313     menuFile->AppendSeparator();
 314 #if wxUSE_DYNLIB_CLASS
 315     menuFile->Append(Render_Load, wxT("&Load renderer...\tCtrl-L"));
 316     menuFile->Append(Render_Unload, wxT("&Unload renderer\tCtrl-U"));
 317     menuFile->AppendSeparator();
 318 #endif // wxUSE_DYNLIB_CLASS
 319     menuFile->Append(Render_Quit);
 320
 321     // the "About" item should be in the help menu
 322     wxMenu *helpMenu = new wxMenu;
 323     helpMenu->Append(Render_About);
 324
 325     // now append the freshly created menu to the menu bar...
 326     wxMenuBar *menuBar = new wxMenuBar();
 327     menuBar->Append(menuFile, wxT("&File"));
 328     menuBar->Append(helpMenu, wxT("&Help"));
 329
 330     // ... and attach this menu bar to the frame
 331     SetMenuBar(menuBar);
 332 #endif // wxUSE_MENUS
 333
 334     m_panel = new MyPanel(this);
 335
 336 #if wxUSE_STATUSBAR
 337     // create a status bar just for fun (by default with 1 pane only)
 338     CreateStatusBar(2);
 339     SetStatusText(wxT("Welcome to wxWidgets!"));
 340 #endif // wxUSE_STATUSBAR
 341
 342     Show();
 343 }
 344
 345 MyFrame::~MyFrame()
 346 {
 347     delete wxRendererNative::Set(NULL);
 348 }
 349
 350
 351 // event handlers
 352
 353 void MyFrame::OnToggleDrawFlag(wxCommandEvent& event, int flag)
 354 {
 355     int flags = m_panel->GetFlags();
 356     if ( event.IsChecked() )
 357         flags |= flag;
 358     else
 359         flags &= ~flag;
 360
 361     m_panel->SetFlags(flags);
 362     m_panel->Refresh();
 363 }
 364
 365 #if wxUSE_DYNLIB_CLASS
 366
 367 void MyFrame::OnLoad(wxCommandEvent& WXUNUSED(event))
 368 {
 369     static wxString s_name = wxT("renddll");
 370
 371     wxString name = wxGetTextFromUser
 372                     (
 373                         wxT("Name of the renderer to load:"),
 374                         wxT("Render wxWidgets Sample"),
 375                         s_name,
 376                         this
 377                     );
 378     if ( name.empty() )
 379     {
 380         // cancelled
 381         return;
 382     }
 383
 384     s_name = name;
 385
 386     wxRendererNative *renderer = wxRendererNative::Load(name);
 387     if ( !renderer )
 388     {
 389         wxLogError(wxT("Failed to load renderer \"%s\"."), name.c_str());
 390     }
 391     else // loaded ok
 392     {
 393         delete wxRendererNative::Set(renderer);
 394
 395         m_panel->Refresh();
 396
 397         wxLogStatus(this, wxT("Successfully loaded the renderer \"%s\"."),
 398                     name.c_str());
 399     }
 400 }
 401
 402 void MyFrame::OnUnload(wxCommandEvent& WXUNUSED(event))
 403 {
 404     wxRendererNative *renderer = wxRendererNative::Set(NULL);
 405     if ( renderer )
 406     {
 407         delete renderer;
 408
 409         m_panel->Refresh();
 410
 411         wxLogStatus(this, wxT("Unloaded the previously loaded renderer."));
 412     }
 413     else
 414     {
 415         wxLogWarning(wxT("No renderer to unload."));
 416     }
 417 }
 418
 419 #endif // wxUSE_DYNLIB_CLASS
 420
 421 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 422 {
 423     // true is to force the frame to close
 424     Close(true);
 425 }
 426
 427 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 428 {
 429     wxMessageBox(wxT("Render sample shows how to use custom renderers.\n")
 430                  wxT("\n")
 431                  wxT("(c) 2003 Vadim Zeitlin"),
 432                  wxT("About Render wxWidgets Sample"),
 433                  wxOK | wxICON_INFORMATION, this);
 434 }
 435