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