| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: erase.cpp |
| 3 | // Purpose: Erase wxWidgets sample |
| 4 | // Author: Robert Roebling |
| 5 | // Modified by: |
| 6 | // Created: 04/01/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Robert Roebling |
| 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 | // for all others, include the necessary headers (this file is usually all you |
| 28 | // need because it includes almost all "standard" wxWidgets headers) |
| 29 | #ifndef WX_PRECOMP |
| 30 | #include "wx/wx.h" |
| 31 | #endif |
| 32 | |
| 33 | // ---------------------------------------------------------------------------- |
| 34 | // resources |
| 35 | // ---------------------------------------------------------------------------- |
| 36 | // the application icon |
| 37 | #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__) |
| 38 | #include "mondrian.xpm" |
| 39 | #endif |
| 40 | |
| 41 | // ---------------------------------------------------------------------------- |
| 42 | // private classes |
| 43 | // ---------------------------------------------------------------------------- |
| 44 | |
| 45 | class MyApp : public wxApp |
| 46 | { |
| 47 | public: |
| 48 | virtual bool OnInit(); |
| 49 | }; |
| 50 | |
| 51 | |
| 52 | class MyCanvas : public wxScrolledWindow |
| 53 | { |
| 54 | public: |
| 55 | MyCanvas( wxFrame *parent ); |
| 56 | |
| 57 | void UseBuffer(bool useBuffer) { m_useBuffer = useBuffer; Refresh(); } |
| 58 | void EraseBg(bool eraseBg) { m_eraseBg = eraseBg; Refresh(); } |
| 59 | |
| 60 | private: |
| 61 | void OnPaint( wxPaintEvent &event ); |
| 62 | void OnChar( wxKeyEvent &event ); |
| 63 | void OnEraseBackground( wxEraseEvent &event ); |
| 64 | |
| 65 | void DoPaint(wxDC& dc); |
| 66 | |
| 67 | |
| 68 | wxBitmap m_bitmap; |
| 69 | wxString m_text; |
| 70 | |
| 71 | // use wxMemoryDC in OnPaint()? |
| 72 | bool m_useBuffer; |
| 73 | |
| 74 | // paint custom background in OnEraseBackground()? |
| 75 | bool m_eraseBg; |
| 76 | |
| 77 | |
| 78 | DECLARE_EVENT_TABLE() |
| 79 | }; |
| 80 | |
| 81 | class MyFrame : public wxFrame |
| 82 | { |
| 83 | public: |
| 84 | MyFrame(); |
| 85 | |
| 86 | void OnUseBuffer(wxCommandEvent& event); |
| 87 | void OnEraseBg(wxCommandEvent& event); |
| 88 | void OnQuit(wxCommandEvent& event); |
| 89 | void OnAbout(wxCommandEvent& event); |
| 90 | |
| 91 | private: |
| 92 | MyCanvas *m_canvas; |
| 93 | |
| 94 | DECLARE_EVENT_TABLE() |
| 95 | }; |
| 96 | |
| 97 | |
| 98 | // ---------------------------------------------------------------------------- |
| 99 | // constants |
| 100 | // ---------------------------------------------------------------------------- |
| 101 | |
| 102 | enum |
| 103 | { |
| 104 | // menu items |
| 105 | Erase_Menu_UseBuffer = 100, |
| 106 | Erase_Menu_EraseBg, |
| 107 | Erase_Menu_Exit = wxID_EXIT, |
| 108 | Erase_Menu_About = wxID_ABOUT |
| 109 | }; |
| 110 | |
| 111 | |
| 112 | // ---------------------------------------------------------------------------- |
| 113 | // the application class |
| 114 | // ---------------------------------------------------------------------------- |
| 115 | |
| 116 | IMPLEMENT_APP(MyApp) |
| 117 | |
| 118 | bool MyApp::OnInit() |
| 119 | { |
| 120 | MyFrame *frame = new MyFrame; |
| 121 | |
| 122 | frame->Show(true); |
| 123 | |
| 124 | return true; |
| 125 | } |
| 126 | |
| 127 | // ---------------------------------------------------------------------------- |
| 128 | // main frame |
| 129 | // ---------------------------------------------------------------------------- |
| 130 | |
| 131 | BEGIN_EVENT_TABLE(MyFrame, wxFrame) |
| 132 | EVT_MENU(Erase_Menu_UseBuffer, MyFrame::OnUseBuffer) |
| 133 | EVT_MENU(Erase_Menu_EraseBg, MyFrame::OnEraseBg) |
| 134 | EVT_MENU(Erase_Menu_Exit, MyFrame::OnQuit) |
| 135 | EVT_MENU(Erase_Menu_About, MyFrame::OnAbout) |
| 136 | END_EVENT_TABLE() |
| 137 | |
| 138 | // frame constructor |
| 139 | MyFrame::MyFrame() |
| 140 | : wxFrame(NULL, wxID_ANY, _T("Erase sample"), |
| 141 | wxPoint(50, 50), wxSize(450, 340)) |
| 142 | { |
| 143 | SetIcon(wxICON(mondrian)); |
| 144 | |
| 145 | wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF); |
| 146 | menuFile->AppendCheckItem(Erase_Menu_UseBuffer, _T("&Use memory DC\tCtrl-M")); |
| 147 | menuFile->AppendCheckItem(Erase_Menu_EraseBg, _T("Custom &background\tCtrl-B")); |
| 148 | menuFile->AppendSeparator(); |
| 149 | menuFile->Append(Erase_Menu_Exit, _T("E&xit\tAlt-X"), _T("Quit this program")); |
| 150 | |
| 151 | |
| 152 | wxMenu *helpMenu = new wxMenu; |
| 153 | helpMenu->Append(Erase_Menu_About, _T("&About...\tCtrl-A"), _T("Show about dialog")); |
| 154 | |
| 155 | wxMenuBar *menuBar = new wxMenuBar(); |
| 156 | menuBar->Append(menuFile, _T("&File")); |
| 157 | menuBar->Append(helpMenu, _T("&Help")); |
| 158 | |
| 159 | SetMenuBar(menuBar); |
| 160 | |
| 161 | #if wxUSE_STATUSBAR |
| 162 | // create a status bar just for fun (by default with 1 pane only) |
| 163 | CreateStatusBar(2); |
| 164 | SetStatusText(_T("Welcome to wxWidgets erase sample!")); |
| 165 | #endif // wxUSE_STATUSBAR |
| 166 | |
| 167 | m_canvas = new MyCanvas( this ); |
| 168 | } |
| 169 | |
| 170 | |
| 171 | void MyFrame::OnUseBuffer(wxCommandEvent& event) |
| 172 | { |
| 173 | m_canvas->UseBuffer(event.IsChecked()); |
| 174 | } |
| 175 | |
| 176 | void MyFrame::OnEraseBg(wxCommandEvent& event) |
| 177 | { |
| 178 | m_canvas->EraseBg(event.IsChecked()); |
| 179 | } |
| 180 | |
| 181 | void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) |
| 182 | { |
| 183 | Close(true); |
| 184 | } |
| 185 | |
| 186 | void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) |
| 187 | { |
| 188 | wxMessageBox(_T("This sample shows how you can draw custom background."), |
| 189 | _T("About Erase Sample"), wxOK | wxICON_INFORMATION, this); |
| 190 | } |
| 191 | |
| 192 | |
| 193 | BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) |
| 194 | EVT_PAINT( MyCanvas::OnPaint) |
| 195 | EVT_CHAR( MyCanvas::OnChar) |
| 196 | EVT_ERASE_BACKGROUND( MyCanvas::OnEraseBackground) |
| 197 | END_EVENT_TABLE() |
| 198 | |
| 199 | MyCanvas::MyCanvas( wxFrame *parent ) |
| 200 | : wxScrolledWindow( parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, |
| 201 | wxScrolledWindowStyle | wxSUNKEN_BORDER ) |
| 202 | { |
| 203 | m_eraseBg = |
| 204 | m_useBuffer = false; |
| 205 | |
| 206 | SetScrollbars( 10, 10, 40, 100, 0, 0 ); |
| 207 | |
| 208 | m_bitmap = wxBitmap( wxICON(mondrian) ); |
| 209 | |
| 210 | new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) ); |
| 211 | |
| 212 | SetFocusIgnoringChildren(); |
| 213 | } |
| 214 | |
| 215 | void MyCanvas::OnChar( wxKeyEvent &event ) |
| 216 | { |
| 217 | #if wxUSE_UNICODE |
| 218 | if (event.m_uniChar) |
| 219 | { |
| 220 | m_text += event.m_uniChar; |
| 221 | Refresh(); |
| 222 | return; |
| 223 | } |
| 224 | #endif |
| 225 | |
| 226 | // some test cases |
| 227 | switch (event.m_keyCode) |
| 228 | { |
| 229 | case WXK_UP: m_text += wxT( "<UP>" ); break; |
| 230 | case WXK_LEFT: m_text += wxT( "<LEFT>" ); break; |
| 231 | case WXK_RIGHT: m_text += wxT( "<RIGHT>" ); break; |
| 232 | case WXK_DOWN: m_text += wxT( "<DOWN>" ); break; |
| 233 | case WXK_RETURN: m_text += wxT( "<ENTER>" ); break; |
| 234 | default: m_text += (wxChar)event.m_keyCode; break; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | void MyCanvas::DoPaint(wxDC& dc) |
| 239 | { |
| 240 | dc.SetBrush( *wxBLACK_BRUSH ); |
| 241 | dc.DrawRectangle( 10,10,200,50 ); |
| 242 | |
| 243 | dc.DrawBitmap( m_bitmap, 10, 20, true ); |
| 244 | |
| 245 | dc.SetTextForeground(*wxBLUE); |
| 246 | dc.DrawText(_T("This text is drawn from OnPaint"), 65, 65); |
| 247 | |
| 248 | wxString tmp; |
| 249 | tmp.Printf( _T("Hit any key to display more text: %s"), m_text.c_str() ); |
| 250 | int w,h; |
| 251 | dc.GetTextExtent( tmp, &w, &h ); |
| 252 | dc.SetBrush( *wxWHITE_BRUSH ); |
| 253 | dc.DrawRectangle( 65, 85, w, h ); |
| 254 | dc.DrawText( tmp, 65, 85 ); |
| 255 | |
| 256 | #if 0 |
| 257 | wxRegionIterator upd( GetUpdateRegion() ); |
| 258 | while (upd) |
| 259 | { |
| 260 | wxLogDebug( _T("Paint: %d %d %d %d"), upd.GetX(), upd.GetY(), upd.GetWidth(), upd.GetHeight() ); |
| 261 | upd ++; |
| 262 | } |
| 263 | #endif |
| 264 | |
| 265 | #if 0 |
| 266 | wxSize size = GetSize(); |
| 267 | wxSize client_size = GetClientSize(); |
| 268 | wxLogDebug( _T("size %d %d client_size %d %d"), size.x, size.y, client_size.x, client_size.y ); |
| 269 | #endif |
| 270 | |
| 271 | #if 0 |
| 272 | int i; |
| 273 | dc.SetPen( *wxWHITE_PEN ); |
| 274 | for (i = 0; i < 20; i += 2) |
| 275 | dc.DrawLine( i,i, i+100,i ); |
| 276 | |
| 277 | dc.SetPen( *wxWHITE_PEN ); |
| 278 | for (i = 200; i < 220; i += 2) |
| 279 | dc.DrawLine( i-200,i, i-100,i ); |
| 280 | |
| 281 | wxRegion region( 110, 110, 80, 80 ); |
| 282 | wxRegion hole( 130, 130, 40, 1 ); |
| 283 | region.Intersect( hole ); |
| 284 | dc.SetClippingRegion( region ); |
| 285 | |
| 286 | dc.SetBrush( *wxRED_BRUSH ); |
| 287 | dc.DrawRectangle( 100, 100, 200, 200 ); |
| 288 | |
| 289 | dc.DestroyClippingRegion(); |
| 290 | |
| 291 | dc.SetPen( *wxTRANSPARENT_PEN ); |
| 292 | |
| 293 | wxRegion strip( 110, 200, 30, 1 ); |
| 294 | wxRegionIterator it( strip ); |
| 295 | while (it) |
| 296 | { |
| 297 | dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() ); |
| 298 | it ++; |
| 299 | } |
| 300 | #endif // 0 |
| 301 | } |
| 302 | |
| 303 | void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) ) |
| 304 | { |
| 305 | wxPaintDC dcWin(this); |
| 306 | PrepareDC( dcWin ); |
| 307 | |
| 308 | if ( m_useBuffer ) |
| 309 | { |
| 310 | const wxSize size = GetClientSize(); |
| 311 | wxMemoryDC dc; |
| 312 | wxBitmap bmp(size.x, size.y); |
| 313 | dc.SelectObject(bmp); |
| 314 | dc.Blit(0, 0, size.x, size.y, &dcWin, 0, 0); |
| 315 | dc.DrawText(_T("(copy of background)"), 5, 120 ); |
| 316 | |
| 317 | DoPaint(dc); |
| 318 | |
| 319 | dcWin.Blit(0, 0, size.x, size.y, &dc, 0, 0); |
| 320 | } |
| 321 | else |
| 322 | { |
| 323 | DoPaint(dcWin); |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | void MyCanvas::OnEraseBackground( wxEraseEvent& event ) |
| 328 | { |
| 329 | if ( !m_eraseBg ) |
| 330 | { |
| 331 | event.Skip(); |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | wxDC& dc = *event.GetDC(); |
| 336 | dc.SetPen(*wxGREEN_PEN); |
| 337 | |
| 338 | PrepareDC( dc ); |
| 339 | |
| 340 | // clear any junk currently displayed |
| 341 | dc.Clear(); |
| 342 | |
| 343 | const wxSize size = GetClientSize(); |
| 344 | for ( int x = 0; x < size.x; x += 15 ) |
| 345 | { |
| 346 | dc.DrawLine(x, 0, x, size.y); |
| 347 | } |
| 348 | |
| 349 | for ( int y = 0; y < size.y; y += 15 ) |
| 350 | { |
| 351 | dc.DrawLine(0, y, size.x, y); |
| 352 | } |
| 353 | |
| 354 | dc.SetTextForeground(*wxRED); |
| 355 | dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 160); |
| 356 | } |
| 357 | |