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