samples/dnd/dnd.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     Drag and drop sample
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15 #pragma hdrstop
  16 #endif
  17
  18 #ifndef WX_PRECOMP
  19 #include "wx/wx.h"
  20 #endif
  21
  22 #include  "wx/intl.h"
  23 #include  "wx/log.h"
  24
  25 #include  "wx/dnd.h"
  26
  27 #ifdef __WXGTK__
  28 #include "mondrian.xpm"
  29 #endif
  30
  31 // ----------------------------------------------------------------------------
  32 // Derive two simple classes which just put in the listbox the strings (text or
  33 // file names) we drop on them
  34 // ----------------------------------------------------------------------------
  35
  36 class DnDText : public wxTextDropTarget
  37 {
  38 public:
  39   DnDText(wxListBox *pOwner) { m_pOwner = pOwner; }
  40
  41   virtual bool OnDropText(long x, long y, const char *psz );
  42
  43 private:
  44   wxListBox *m_pOwner;
  45 };
  46
  47 class DnDFile : public wxFileDropTarget
  48 {
  49 public:
  50   DnDFile(wxListBox *pOwner) { m_pOwner = pOwner; }
  51
  52   virtual bool OnDropFiles(long x, long y,
  53                            size_t nFiles, const char * const aszFiles[] );
  54
  55 private:
  56   wxListBox *m_pOwner;
  57 };
  58
  59 // ----------------------------------------------------------------------------
  60 // Define a new application type
  61 // ----------------------------------------------------------------------------
  62
  63 class DnDApp : public wxApp
  64 {
  65 public:
  66   bool OnInit();
  67 };
  68
  69 IMPLEMENT_APP(DnDApp);
  70
  71 // ----------------------------------------------------------------------------
  72 // Define a new frame type
  73 // ----------------------------------------------------------------------------
  74 class DnDFrame : public wxFrame
  75 {
  76 public:
  77   DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h);
  78  ~DnDFrame();
  79
  80   void OnPaint(wxPaintEvent& event);
  81   void OnQuit (wxCommandEvent& event);
  82   void OnAbout(wxCommandEvent& event);
  83   void OnDrag (wxCommandEvent& event);
  84   void OnHelp (wxCommandEvent& event);
  85   void OnLogClear(wxCommandEvent& event);
  86
  87   void OnLeftDown(wxMouseEvent& event);
  88   void OnRightDown(wxMouseEvent& event);
  89
  90   bool OnClose();
  91
  92   DECLARE_EVENT_TABLE()
  93
  94 private:
  95   wxListBox  *m_ctrlFile,
  96              *m_ctrlText;
  97   wxTextCtrl *m_ctrlLog;
  98
  99   wxLog *m_pLog, *m_pLogPrev;
 100
 101   wxString m_strText;
 102 };
 103
 104 // ----------------------------------------------------------------------------
 105 // IDs for the menu commands
 106 // ----------------------------------------------------------------------------
 107
 108 enum
 109 {
 110   Menu_Quit = 1,
 111   Menu_Drag,
 112   Menu_About = 101,
 113   Menu_Help,
 114   Menu_Clear,
 115 };
 116
 117 BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
 118   EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
 119   EVT_MENU(Menu_About, DnDFrame::OnAbout)
 120   EVT_MENU(Menu_Drag,  DnDFrame::OnDrag)
 121   EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
 122   EVT_MENU(Menu_Clear, DnDFrame::OnLogClear)
 123   EVT_LEFT_DOWN(       DnDFrame::OnLeftDown)
 124   EVT_RIGHT_DOWN(      DnDFrame::OnRightDown)
 125   EVT_PAINT(           DnDFrame::OnPaint)
 126 END_EVENT_TABLE()
 127
 128 // `Main program' equivalent, creating windows and returning main app frame
 129 bool DnDApp::OnInit()
 130 {
 131   // create the main frame window
 132   DnDFrame *frame = new DnDFrame((wxFrame  *) NULL, "Drag & Drop wxWindows App",
 133                                  50, 50, 450, 340);
 134
 135   // activate it
 136   frame->Show(TRUE);
 137
 138   SetTopWindow(frame);
 139
 140   return TRUE;
 141 }
 142
 143 DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
 144         : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h)),
 145           m_strText("wxWindows drag & drop works :-)")
 146
 147 {
 148 //  SetBackgroundColour(* wxWHITE);
 149
 150   // frame icon and status bar
 151   SetIcon(wxICON(mondrian));
 152
 153 //  const int widths[] = { -1 };
 154   CreateStatusBar();
 155
 156   // construct menu
 157   wxMenu *file_menu = new wxMenu;
 158   file_menu->Append(Menu_Drag, "&Test drag...");
 159   file_menu->AppendSeparator();
 160   file_menu->Append(Menu_Quit, "E&xit");
 161
 162   wxMenu *log_menu = new wxMenu;
 163   log_menu->Append(Menu_Clear, "Clear");
 164
 165   wxMenu *help_menu = new wxMenu;
 166   help_menu->Append(Menu_Help, "&Help...");
 167   help_menu->AppendSeparator();
 168   help_menu->Append(Menu_About, "&About");
 169
 170   wxMenuBar *menu_bar = new wxMenuBar;
 171   menu_bar->Append(file_menu, "&File");
 172   menu_bar->Append(log_menu,  "&Log");
 173   menu_bar->Append(help_menu, "&Help");
 174
 175   SetMenuBar(menu_bar);
 176
 177   // make a panel with 3 subwindows
 178   wxPoint pos(0, 0);
 179   wxSize  size(400, 200);
 180
 181   wxString strFile("Drop files here!"), strText("Drop text on me");
 182
 183   m_ctrlFile  = new wxListBox(this, -1, pos, size, 1, &strFile, wxLB_HSCROLL);
 184   m_ctrlText  = new wxListBox(this, -1, pos, size, 1, &strText, wxLB_HSCROLL);
 185
 186   m_ctrlLog   = new wxTextCtrl(this, -1, "", pos, size,
 187                                wxTE_MULTILINE | wxTE_READONLY |
 188                                wxSUNKEN_BORDER );
 189
 190   // redirect log messages to the text window (don't forget to delete it!)
 191   m_pLog = new wxLogTextCtrl(m_ctrlLog);
 192   m_pLogPrev = wxLog::SetActiveTarget(m_pLog);
 193
 194   // associate drop targets with 2 text controls
 195   m_ctrlFile->SetDropTarget(new DnDFile(m_ctrlFile));
 196   m_ctrlText->SetDropTarget( new DnDText(m_ctrlText) );
 197
 198   wxLayoutConstraints *c;
 199
 200   // Top-left listbox
 201   c = new wxLayoutConstraints;
 202   c->left.SameAs(this, wxLeft);
 203   c->top.SameAs(this, wxTop);
 204   c->right.PercentOf(this, wxRight, 50);
 205   c->height.PercentOf(this, wxHeight, 40);
 206   m_ctrlFile->SetConstraints(c);
 207
 208   // Top-right listbox
 209   c = new wxLayoutConstraints;
 210   c->left.SameAs    (m_ctrlFile, wxRight);
 211   c->top.SameAs     (this, wxTop);
 212   c->right.SameAs   (this, wxRight);
 213   c->height.PercentOf(this, wxHeight, 40);
 214   m_ctrlText->SetConstraints(c);
 215
 216   // Lower text control
 217   c = new wxLayoutConstraints;
 218   c->left.SameAs    (this, wxLeft);
 219   c->right.SameAs   (this, wxRight);
 220   c->height.PercentOf(this, wxHeight, 40);
 221   c->top.SameAs(m_ctrlText, wxBottom);
 222   m_ctrlLog->SetConstraints(c);
 223
 224   SetAutoLayout(TRUE);
 225 }
 226
 227 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 228 {
 229   Close(TRUE);
 230 }
 231
 232 void DnDFrame::OnPaint(wxPaintEvent& /*event*/)
 233 {
 234   int w = 0;
 235   int h = 0;
 236   GetClientSize( &w, &h );
 237
 238   wxPaintDC dc(this);
 239   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL, FALSE, "charter" ) );
 240   dc.DrawText( "Drag text from here!", 20, h-22 );
 241 }
 242
 243 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 244 {
 245   wxString strText = wxGetTextFromUser
 246   (
 247     "After you enter text in this dialog, press any mouse\n"
 248     "button in the bottom (empty) part of the frame and \n"
 249     "drag it anywhere - you will be in fact dragging the\n"
 250     "text object containing this text",
 251     "Please enter some text", m_strText, this
 252   );
 253
 254   m_strText = strText;
 255 }
 256
 257 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 258 {
 259   wxMessageDialog dialog(this,
 260                          "Drag-&-Drop Demo\n"
 261                          "Please see \"Help|Help...\" for details\n"
 262                          "Copyright (c) 1998 Vadim Zeitlin",
 263                          "About wxDnD");
 264
 265   dialog.ShowModal();
 266 }
 267
 268 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 269 {
 270   wxMessageDialog dialog(this,
 271 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 272 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 273 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 274 "and the right one accepts text.\n"
 275 "\n"
 276 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 277 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 278 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 279 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 280 "work with files) and see what changes.\n"
 281 "\n"
 282 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 283 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 284 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 285 "change, don't release the mouse button until it does. You can change the string being\n"
 286 "dragged in in \"File|Test drag...\" dialog.\n"
 287 "\n"
 288 "\n"
 289 "Please send all questions/bug reports/suggestions &c to \n"
 290 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 291                         "wxDnD Help");
 292
 293   dialog.ShowModal();
 294 }
 295
 296 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 297 {
 298   m_ctrlLog->Clear();
 299 }
 300
 301 bool DnDFrame::OnClose()
 302 {
 303   return TRUE;
 304 }
 305
 306 void DnDFrame::OnLeftDown(wxMouseEvent &WXUNUSED(event) )
 307 {
 308   if ( !m_strText.IsEmpty() )
 309   {
 310     // start drag operation
 311 #ifdef __WXMSW__
 312     wxTextDataObject textData(m_strText);
 313     wxDropSource dragSource( textData, this );
 314 #else
 315     wxDropSource dragSource( new wxTextDataObject (m_strText), this );
 316 #endif
 317     const char *pc;
 318
 319     switch ( dragSource.DoDragDrop(TRUE) )
 320     {
 321       case wxDragError:   pc = "Error!";    break;
 322       case wxDragNone:    pc = "Nothing";   break;
 323       case wxDragCopy:    pc = "Copied";    break;
 324       case wxDragMove:    pc = "Moved";     break;
 325       case wxDragCancel:  pc = "Cancelled"; break;
 326       default:                    pc = "Huh?";      break;
 327     }
 328
 329     SetStatusText(wxString("Drag result: ") + pc);
 330   }
 331 }
 332
 333 void DnDFrame::OnRightDown(wxMouseEvent &event )
 334 {
 335   wxMenu *menu = new wxMenu;
 336
 337   menu->Append(Menu_Drag, "&Test drag...");
 338   menu->Append(Menu_About, "&About");
 339   menu->Append(Menu_Quit, "E&xit");
 340
 341   PopupMenu( menu, event.GetX(), event.GetY() );
 342 }
 343
 344 DnDFrame::~DnDFrame()
 345 {
 346   if ( m_pLog != NULL ) {
 347     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 348       delete m_pLog;
 349   }
 350 }
 351
 352 // ----------------------------------------------------------------------------
 353 // Notifications called by the base class
 354 // ----------------------------------------------------------------------------
 355 bool DnDText::OnDropText(long, long, const char *psz)
 356 {
 357   m_pOwner->Append(psz);
 358
 359   return TRUE;
 360 }
 361
 362 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 363                           const char * const aszFiles[])
 364 {
 365   wxString str;
 366   str.Printf("%d files dropped", nFiles);
 367   m_pOwner->Append(str);
 368   for ( size_t n = 0; n < nFiles; n++ ) {
 369     m_pOwner->Append(aszFiles[n]);
 370   }
 371
 372   return TRUE;
 373 }