samples/vscroll/vstest.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        vscroll.cpp
   3 // Purpose:     VScroll wxWidgets sample
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
   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     #include "wx/app.h"
  32     #include "wx/frame.h"
  33 #endif
  34
  35 // we need to include the headers not included from wx/wx.h explicitly anyhow
  36 #include "wx/vscroll.h"
  37
  38 // ----------------------------------------------------------------------------
  39 // resources
  40 // ----------------------------------------------------------------------------
  41
  42 // the application icon (under Windows and OS/2 it is in resources)
  43 #if !defined(__WXMSW__) && !defined(__WXOS2__)
  44     #include "mondrian.xpm"
  45 #endif
  46
  47 // ----------------------------------------------------------------------------
  48 // private classes
  49 // ----------------------------------------------------------------------------
  50
  51 // Define a new application type, each program should derive a class from wxApp
  52 class VScrollApp : public wxApp
  53 {
  54 public:
  55     // create our main window
  56     virtual bool OnInit();
  57 };
  58
  59 // Define a new frame type: this is going to be our main frame
  60 class VScrollFrame : public wxFrame
  61 {
  62 public:
  63     // ctor
  64     VScrollFrame();
  65
  66     // event handlers (these functions should _not_ be virtual)
  67     void OnQuit(wxCommandEvent& event);
  68     void OnAbout(wxCommandEvent& event);
  69
  70     void OnSize(wxSizeEvent& event)
  71     {
  72         // show current size in the status bar
  73 #if wxUSE_STATUSBAR
  74         if ( m_frameStatusBar )
  75         {
  76             wxSize sz = GetClientSize();
  77             SetStatusText(wxString::Format(_T("%dx%d"), sz.x, sz.y), 1);
  78         }
  79 #endif // wxUSE_STATUSBAR
  80
  81         event.Skip();
  82     }
  83
  84 private:
  85     // any class wishing to process wxWidgets events must use this macro
  86     DECLARE_EVENT_TABLE()
  87 };
  88
  89 class VScrollWindow : public wxVScrolledWindow
  90 {
  91 public:
  92     VScrollWindow(wxFrame *frame) : wxVScrolledWindow(frame, wxID_ANY)
  93     {
  94         m_frame = frame;
  95
  96         SetLineCount(200);
  97
  98         m_changed = true;
  99     }
 100
 101     void OnIdle(wxIdleEvent&)
 102     {
 103         m_frame->SetStatusText(wxString::Format
 104                                (
 105                                     _T("Page size = %d, pos = %d, max = %d"),
 106                                     GetScrollThumb(wxVERTICAL),
 107                                     GetScrollPos(wxVERTICAL),
 108                                     GetScrollRange(wxVERTICAL)
 109                                ));
 110         m_changed = false;
 111     }
 112
 113     void OnPaint(wxPaintEvent&)
 114     {
 115         wxPaintDC dc(this);
 116
 117         dc.SetPen(*wxBLACK_DASHED_PEN);
 118
 119         const size_t lineFirst = GetFirstVisibleLine(),
 120                      lineLast = GetLastVisibleLine();
 121
 122         const wxCoord hText = dc.GetCharHeight();
 123
 124         wxCoord y = 0;
 125         for ( size_t line = lineFirst; line <= lineLast; line++ )
 126         {
 127             dc.DrawLine(0, y, 1000, y);
 128
 129             wxCoord hLine = OnGetLineHeight(line);
 130             dc.DrawText(wxString::Format(_T("Line %lu"), (unsigned long)line),
 131                         0, y + (hLine - hText) / 2);
 132
 133             y += hLine;
 134             dc.DrawLine(0, y, 1000, y);
 135         }
 136     }
 137
 138     void OnScroll(wxScrollWinEvent& event)
 139     {
 140         m_changed = true;
 141
 142         event.Skip();
 143     }
 144
 145
 146     virtual wxCoord OnGetLineHeight(size_t n) const
 147     {
 148         wxASSERT( n < GetLineCount() );
 149
 150         return n % 2 ? 15 : 30; // 15 + 2*n
 151     }
 152
 153 private:
 154     wxFrame *m_frame;
 155
 156     bool m_changed;
 157
 158     DECLARE_EVENT_TABLE()
 159 };
 160
 161 BEGIN_EVENT_TABLE(VScrollWindow, wxVScrolledWindow)
 162     EVT_IDLE(VScrollWindow::OnIdle)
 163     EVT_PAINT(VScrollWindow::OnPaint)
 164     EVT_SCROLLWIN(VScrollWindow::OnScroll)
 165 END_EVENT_TABLE()
 166
 167 // ----------------------------------------------------------------------------
 168 // constants
 169 // ----------------------------------------------------------------------------
 170
 171 // IDs for the controls and the menu commands
 172 enum
 173 {
 174     // menu items
 175     VScroll_Quit = 1,
 176
 177     // it is important for the id corresponding to the "About" command to have
 178     // this standard value as otherwise it won't be handled properly under Mac
 179     // (where it is special and put into the "Apple" menu)
 180     VScroll_About = wxID_ABOUT
 181 };
 182
 183 // ----------------------------------------------------------------------------
 184 // event tables and other macros for wxWidgets
 185 // ----------------------------------------------------------------------------
 186
 187 // the event tables connect the wxWidgets events with the functions (event
 188 // handlers) which process them. It can be also done at run-time, but for the
 189 // simple menu events like this the static method is much simpler.
 190 BEGIN_EVENT_TABLE(VScrollFrame, wxFrame)
 191     EVT_MENU(VScroll_Quit,  VScrollFrame::OnQuit)
 192     EVT_MENU(VScroll_About, VScrollFrame::OnAbout)
 193     EVT_SIZE(VScrollFrame::OnSize)
 194 END_EVENT_TABLE()
 195
 196 // Create a new application object: this macro will allow wxWidgets to create
 197 // the application object during program execution (it's better than using a
 198 // static object for many reasons) and also declares the accessor function
 199 // wxGetApp() which will return the reference of the right type (i.e. VScrollApp and
 200 // not wxApp)
 201 IMPLEMENT_APP(VScrollApp)
 202
 203 // ============================================================================
 204 // implementation
 205 // ============================================================================
 206
 207 // ----------------------------------------------------------------------------
 208 // the application class
 209 // ----------------------------------------------------------------------------
 210
 211 // 'Main program' equivalent: the program execution "starts" here
 212 bool VScrollApp::OnInit()
 213 {
 214     // create the main application window
 215     VScrollFrame *frame = new VScrollFrame;
 216
 217     // and show it (the frames, unlike simple controls, are not shown when
 218     // created initially)
 219     frame->Show(true);
 220
 221     // ok
 222     return true;
 223 }
 224
 225 // ----------------------------------------------------------------------------
 226 // main frame
 227 // ----------------------------------------------------------------------------
 228
 229 // frame constructor
 230 VScrollFrame::VScrollFrame()
 231             : wxFrame(NULL,
 232                       wxID_ANY,
 233                       _T("VScroll wxWidgets Sample"),
 234                       wxDefaultPosition,
 235                       wxSize(400, 350))
 236 {
 237     // set the frame icon
 238     SetIcon(wxICON(mondrian));
 239
 240 #if wxUSE_MENUS
 241     // create a menu bar
 242     wxMenu *menuFile = new wxMenu;
 243
 244     // the "About" item should be in the help menu
 245     wxMenu *menuHelp = new wxMenu;
 246     menuHelp->Append(VScroll_About, _T("&About...\tF1"), _T("Show about dialog"));
 247
 248     menuFile->Append(VScroll_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 249
 250     // now append the freshly created menu to the menu bar...
 251     wxMenuBar *menuBar = new wxMenuBar;
 252     menuBar->Append(menuFile, _T("&File"));
 253     menuBar->Append(menuHelp, _T("&Help"));
 254
 255     // ... and attach this menu bar to the frame
 256     SetMenuBar(menuBar);
 257 #endif // wxUSE_MENUS
 258
 259 #if wxUSE_STATUSBAR
 260     // create a status bar just for fun (by default with 1 pane only)
 261     CreateStatusBar(2);
 262     SetStatusText(_T("Welcome to wxWidgets!"));
 263 #endif // wxUSE_STATUSBAR
 264
 265     // create our one and only child -- it will take our entire client area
 266     new VScrollWindow(this);
 267 }
 268
 269 // ----------------------------------------------------------------------------
 270 // event handlers
 271 // ----------------------------------------------------------------------------
 272
 273 void VScrollFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 274 {
 275     // true is to force the frame to close
 276     Close(true);
 277 }
 278
 279 void VScrollFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 280 {
 281     wxMessageBox(_T("VScroll shows how to implement scrolling with\n")
 282                  _T("variable line heights.\n")
 283                  _T("© 2003 Vadim Zeitlin"),
 284                  _T("About VScroll"),
 285                  wxOK | wxICON_INFORMATION,
 286                  this);
 287 }