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 OnMouseBtnDown(wxMouseEvent& event);
  86
  87   bool OnClose();
  88
  89   DECLARE_EVENT_TABLE()
  90
  91 private:
  92   wxListBox  *m_ctrlFile,
  93              *m_ctrlText;
  94   wxTextCtrl *m_ctrlLog;
  95
  96   wxLog *m_pLog, *m_pLogPrev;
  97
  98   wxString m_strText;
  99 };
 100
 101 // ----------------------------------------------------------------------------
 102 // IDs for the menu commands
 103 // ----------------------------------------------------------------------------
 104 enum
 105 {
 106   Menu_Quit = 1,
 107   Menu_Drag,
 108   Menu_About = 101,
 109   Menu_Help,
 110   Menu_Clear,
 111 };
 112
 113 BEGIN_EVENT_TABLE(DnDFrame, wxFrame)
 114   EVT_MENU(Menu_Quit,  DnDFrame::OnQuit)
 115   EVT_MENU(Menu_About, DnDFrame::OnAbout)
 116   EVT_MENU(Menu_Drag,  DnDFrame::OnDrag)
 117   EVT_MENU(Menu_Help,  DnDFrame::OnHelp)
 118   EVT_MENU(Menu_Clear, DnDFrame::OnLogClear)
 119
 120   EVT_LEFT_DOWN(OnMouseBtnDown)
 121   EVT_RIGHT_DOWN(OnMouseBtnDown)
 122   EVT_MIDDLE_DOWN(OnMouseBtnDown)
 123 END_EVENT_TABLE()
 124
 125 // `Main program' equivalent, creating windows and returning main app frame
 126 bool DnDApp::OnInit(void)
 127 {
 128   // create the main frame window
 129   DnDFrame *frame = new DnDFrame(NULL, "Drag & Drop wxWindows App",
 130                                  50, 50, 450, 340);
 131
 132   // activate it
 133   frame->Show(TRUE);
 134
 135   SetTopWindow(frame);
 136
 137   return TRUE;
 138 }
 139
 140 DnDFrame::DnDFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
 141         : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h)),
 142           m_strText("wxWindows drag & drop works :-)")
 143
 144 {
 145
 146 #ifdef __WXMSW__
 147   // frame icon and status bar
 148   SetIcon(wxIcon("mondrian"));
 149 #else
 150   SetIcon(wxIcon(mondrian_xpm));
 151 #endif
 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| wxHSCROLL);
 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
 223   m_ctrlLog->SetConstraints(c);
 224
 225   SetAutoLayout(TRUE);
 226 }
 227
 228 void DnDFrame::OnQuit(wxCommandEvent& /* event */)
 229 {
 230   Close(TRUE);
 231 }
 232
 233 void DnDFrame::OnDrag(wxCommandEvent& /* event */)
 234 {
 235   wxString strText = wxGetTextFromUser
 236   (
 237     "After you enter text in this dialog, press any mouse\n"
 238     "button in the bottom (empty) part of the frame and \n"
 239     "drag it anywhere - you will be in fact dragging the\n"
 240     "text object containing this text",
 241     "Please enter some text", m_strText, this
 242   );
 243
 244   m_strText = strText;
 245 }
 246
 247 void DnDFrame::OnAbout(wxCommandEvent& /* event */)
 248 {
 249   wxMessageDialog dialog(this,
 250                          "Drag-&-Drop Demo\n"
 251                          "Please see \"Help|Help...\" for details\n"
 252                          "Copyright (c) 1998 Vadim Zeitlin",
 253                          "About wxDnD");
 254
 255   dialog.ShowModal();
 256 }
 257
 258 void DnDFrame::OnHelp(wxCommandEvent& /* event */)
 259 {
 260   wxMessageDialog dialog(this,
 261 "This small program demonstrates drag & drop support in wxWindows. The program window\n"
 262 "consists of 3 parts: the bottom pane is for debug messages, so that you can see what's\n"
 263 "going on inside. The top part is split into 2 listboxes, the left one accepts files\n"
 264 "and the right one accepts text."
 265 "\n"
 266 "To test wxDropTarget: open wordpad (write.exe), select some text in it and drag it to\n"
 267 "the right listbox (you'll notice the usual visual feedback, i.e. the cursor will change).\n"
 268 "Also, try dragging some files (you can select several at once) from Windows Explorer (or \n"
 269 "File Manager) to the left pane. Hold down Ctrl/Shift keys when you drop text (doesn't \n"
 270 "work with files) and see what changes."
 271 "\n"
 272 "To test wxDropSource: just press any mouse button on the empty zone of the window and drag\n"
 273 "it to wordpad or any other droptarget accepting text (and of course you can just drag it\n"
 274 "to the right pane). Due to a lot of trace messages, the cursor might take some time to \n"
 275 "change, don't release the mouse button until it does. You can change the string being\n"
 276 "dragged in in \"File|Test drag...\" dialog.\n"
 277 "Please send all questions/bug reports/suggestions &c to \n"
 278 "Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>",
 279                         "wxDnD Help");
 280
 281   dialog.ShowModal();
 282 }
 283
 284 void DnDFrame::OnLogClear(wxCommandEvent& /* event */ )
 285 {
 286   m_ctrlLog->Clear();
 287 }
 288
 289 bool DnDFrame::OnClose()
 290 {
 291   return TRUE;
 292 }
 293
 294 void DnDFrame::OnMouseBtnDown(wxMouseEvent& /* event */ )
 295 {
 296   if ( !m_strText.IsEmpty() ) {
 297     // start drag operation
 298     wxTextDataObject data(m_strText);
 299     wxDropSource dragSource(data, this);
 300     const char *pc;
 301
 302     switch ( dragSource.DoDragDrop(TRUE) ) {
 303       case wxDropSource::Error:   pc = "Error!";    break;
 304       case wxDropSource::None:    pc = "Nothing";   break;
 305       case wxDropSource::Copy:    pc = "Copied";    break;
 306       case wxDropSource::Move:    pc = "Moved";     break;
 307       case wxDropSource::Cancel:  pc = "Cancelled"; break;
 308       default:                    pc = "Huh?";      break;
 309     }
 310
 311     SetStatusText(wxString("Drag result: ") + pc);
 312   }
 313 }
 314
 315 DnDFrame::~DnDFrame()
 316 {
 317   if ( m_pLog != NULL ) {
 318     if ( wxLog::SetActiveTarget(m_pLogPrev) == m_pLog )
 319       delete m_pLog;
 320   }
 321 }
 322
 323 // ----------------------------------------------------------------------------
 324 // Notifications called by the base class
 325 // ----------------------------------------------------------------------------
 326 bool DnDText::OnDropText(long, long, const char *psz)
 327 {
 328   m_pOwner->Append(psz);
 329
 330   return TRUE;
 331 }
 332
 333 bool DnDFile::OnDropFiles(long, long, size_t nFiles,
 334                           const char * const aszFiles[])
 335 {
 336   wxString str;
 337   str.Printf("%d files dropped", nFiles);
 338   m_pOwner->Append(str);
 339   for ( size_t n = 0; n < nFiles; n++ ) {
 340     m_pOwner->Append(aszFiles[n]);
 341   }
 342
 343   return TRUE;
 344 }