src/generic/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #pragma implementation "scrolwin.h"
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #include "wx/utils.h"
  21 #include "wx/dcclient.h"
  22
  23 #ifdef __WXMSW__
  24 #include "windows.h"
  25 #endif
  26
  27 #ifdef __BORLANDC__
  28 #pragma hdrstop
  29 #endif
  30
  31 #include "wx/generic/scrolwin.h"
  32
  33 #if !USE_SHARED_LIBRARY
  34 BEGIN_EVENT_TABLE(wxScrolledWindow, wxWindow)
  35   EVT_SCROLL(wxScrolledWindow::OnScroll)
  36   EVT_SIZE(wxScrolledWindow::OnSize)
  37   EVT_PAINT(wxScrolledWindow::OnPaint)
  38 END_EVENT_TABLE()
  39
  40 IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxWindow)
  41 #endif
  42
  43 wxScrolledWindow::wxScrolledWindow(void)
  44 {
  45   m_xScrollPixelsPerLine = 0;
  46   m_yScrollPixelsPerLine = 0;
  47   m_xScrollingEnabled = TRUE;
  48   m_yScrollingEnabled = TRUE;
  49   m_xScrollPosition = 0;
  50   m_yScrollPosition = 0;
  51   m_xScrollLines = 0;
  52   m_yScrollLines = 0;
  53   m_xScrollLinesPerPage = 0;
  54   m_yScrollLinesPerPage = 0;
  55   m_scaleX = 1.0;
  56   m_scaleY = 1.0;
  57 }
  58
  59 bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
  60            const wxPoint& pos,
  61            const wxSize& size,
  62            long style,
  63            const wxString& name)
  64 {
  65   m_xScrollPixelsPerLine = 0;
  66   m_yScrollPixelsPerLine = 0;
  67   m_xScrollingEnabled = TRUE;
  68   m_yScrollingEnabled = TRUE;
  69   m_xScrollPosition = 0;
  70   m_yScrollPosition = 0;
  71   m_xScrollLines = 0;
  72   m_yScrollLines = 0;
  73   m_xScrollLinesPerPage = 0;
  74   m_yScrollLinesPerPage = 0;
  75   m_scaleX = 1.0;
  76   m_scaleY = 1.0;
  77
  78   return wxWindow::Create(parent, id, pos, size, style, name);
  79 }
  80
  81 /*
  82  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
  83  * noUnitsX/noUnitsY:        : no. units per scrollbar
  84  */
  85 void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
  86                int noUnitsX, int noUnitsY,
  87                int xPos, int yPos, bool noRefresh )
  88 {
  89   bool do_refresh =
  90      (
  91       (noUnitsX != 0 && m_xScrollLines == 0) ||
  92       (noUnitsX < m_xScrollPosition) ||
  93       (noUnitsY != 0 && m_yScrollLines == 0) ||
  94       (noUnitsY < m_yScrollPosition) ||
  95       (xPos != m_xScrollPosition) ||
  96       (yPos != m_yScrollPosition) ||
  97       (pixelsPerUnitX != m_xScrollPixelsPerLine) ||
  98       (pixelsPerUnitY != m_yScrollPixelsPerLine)
  99      );
 100
 101       m_xScrollPixelsPerLine = pixelsPerUnitX;
 102       m_yScrollPixelsPerLine = pixelsPerUnitY;
 103       m_xScrollPosition = xPos;
 104       m_yScrollPosition = yPos;
 105       m_xScrollLines = noUnitsX;
 106       m_yScrollLines = noUnitsY;
 107
 108    AdjustScrollbars();
 109
 110    if (do_refresh && !noRefresh) Refresh();
 111
 112 #ifdef __WXMSW__
 113     UpdateWindow ((HWND) GetHWND());
 114 #endif
 115 }
 116
 117 void wxScrolledWindow::OnScroll(wxScrollEvent& event)
 118 {
 119   int orient = event.GetOrientation();
 120
 121   int nScrollInc = CalcScrollInc(event);
 122   if (nScrollInc == 0)
 123     return;
 124
 125     // TODO: should we store the scroll position here as well as in wxWindow?
 126   if (orient == wxHORIZONTAL)
 127   {
 128     int newPos = m_xScrollPosition + nScrollInc;
 129     SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 130   }
 131   else
 132   {
 133     int newPos = m_yScrollPosition + nScrollInc;
 134     SetScrollPos(wxVERTICAL, newPos, TRUE );
 135   }
 136
 137 /*
 138   // TODO We need to multiply the ScrollWindow amount by the scaling
 139   // factor, but how do we know what this is in wxWin 2.0???
 140   float scaleX = 1.0;
 141   float scaleY = 1.0;
 142
 143   if ( this->IsKindOf(CLASSINFO(wxCanvas)) )
 144   {
 145     wxDC* dc = ((wxCanvas *)this)->GetDC();
 146     dc->GetUserScale(&scaleX, &scaleY);
 147   }
 148 */
 149
 150   if (orient == wxHORIZONTAL)
 151   {
 152     m_xScrollPosition += nScrollInc;
 153   }
 154   else
 155   {
 156     m_yScrollPosition += nScrollInc;
 157   }
 158
 159   if (orient == wxHORIZONTAL)
 160   {
 161     if (m_xScrollingEnabled)
 162       ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 163     else
 164       Refresh();
 165   }
 166   else
 167   {
 168     if (m_yScrollingEnabled)
 169       ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 170     else
 171       Refresh();
 172   }
 173
 174 }
 175
 176 int wxScrolledWindow::CalcScrollInc(wxScrollEvent& event)
 177 {
 178   int pos = event.GetPosition();
 179   int orient = event.GetOrientation();
 180
 181   int nScrollInc = 0;
 182   switch (event.GetEventType())
 183   {
 184     case wxEVT_SCROLL_TOP:
 185     {
 186       if (orient == wxHORIZONTAL)
 187         nScrollInc = - m_xScrollPosition;
 188       else
 189         nScrollInc = - m_yScrollPosition;
 190       break;
 191     }
 192     case wxEVT_SCROLL_BOTTOM:
 193     {
 194       if (orient == wxHORIZONTAL)
 195         nScrollInc = m_xScrollLines - m_xScrollPosition;
 196       else
 197         nScrollInc = m_yScrollLines - m_yScrollPosition;
 198       break;
 199     }
 200     case wxEVT_SCROLL_LINEUP:
 201     {
 202       nScrollInc = -1;
 203       break;
 204     }
 205     case wxEVT_SCROLL_LINEDOWN:
 206     {
 207       nScrollInc = 1;
 208       break;
 209     }
 210     case wxEVT_SCROLL_PAGEUP:
 211     {
 212       if (orient == wxHORIZONTAL)
 213         nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 214       else
 215         nScrollInc = -GetScrollPageSize(wxVERTICAL);
 216       break;
 217     }
 218     case wxEVT_SCROLL_PAGEDOWN:
 219     {
 220       if (orient == wxHORIZONTAL)
 221         nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 222       else
 223         nScrollInc = GetScrollPageSize(wxVERTICAL);
 224       break;
 225     }
 226     case wxEVT_SCROLL_THUMBTRACK:
 227     {
 228       if (orient == wxHORIZONTAL)
 229         nScrollInc = pos - m_xScrollPosition;
 230       else
 231         nScrollInc = pos - m_yScrollPosition;
 232       break;
 233     }
 234     default:
 235     {
 236       break;
 237     }
 238   }
 239   if (orient == wxHORIZONTAL)
 240   {
 241     if (m_xScrollPixelsPerLine > 0) {
 242       int w, h;
 243       GetClientSize(&w, &h);
 244
 245       int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
 246       int noPositions = (int) ( ((nMaxWidth - w)/(float)m_xScrollPixelsPerLine) + 0.5 );
 247       if (noPositions < 0)
 248         noPositions = 0;
 249
 250       if ( (m_xScrollPosition + nScrollInc) < 0 )
 251         nScrollInc = -m_xScrollPosition; // As -ve as we can go
 252       else if ( (m_xScrollPosition + nScrollInc) > noPositions )
 253         nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
 254     }
 255     else
 256       Refresh();
 257   }
 258   else
 259   {
 260     if (m_yScrollPixelsPerLine > 0) {
 261       int w, h;
 262       GetClientSize(&w, &h);
 263
 264       int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
 265       int noPositions = (int) ( ((nMaxHeight - h)/(float)m_yScrollPixelsPerLine) + 0.5 );
 266       if (noPositions < 0)
 267         noPositions = 0;
 268
 269       if ( (m_yScrollPosition + nScrollInc) < 0 )
 270         nScrollInc = -m_yScrollPosition; // As -ve as we can go
 271       else if ( (m_yScrollPosition + nScrollInc) > noPositions )
 272         nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
 273     }
 274     else
 275       Refresh();
 276   }
 277
 278   return nScrollInc;
 279 }
 280
 281 // Adjust the scrollbars - new version.
 282 void wxScrolledWindow::AdjustScrollbars(void)
 283 {
 284   int w, h;
 285   GetClientSize(&w, &h);
 286
 287   // Recalculate scroll bar range and position
 288   if (m_xScrollLines > 0)
 289   {
 290     int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
 291     int newRange = (int) ( ((nMaxWidth)/(float)m_xScrollPixelsPerLine) + 0.5 );
 292     if (newRange < 0)
 293       newRange = 0;
 294
 295     m_xScrollPosition = wxMin(newRange, m_xScrollPosition);
 296
 297         // Calculate page size i.e. number of scroll units you get on the
 298         // current client window
 299     int noPagePositions = (int) ( (w/(float)m_xScrollPixelsPerLine) + 0.5 );
 300     if (noPagePositions < 1)
 301       noPagePositions = 1;
 302
 303     SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, newRange);
 304     SetScrollPageSize(wxHORIZONTAL, noPagePositions);
 305   }
 306   // Robert Roebling
 307   else
 308   {
 309     m_xScrollPosition = 0;
 310     SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
 311   }
 312
 313   if (m_yScrollLines > 0)
 314   {
 315     int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
 316     int newRange = (int) ( ((nMaxHeight)/(float)m_yScrollPixelsPerLine) + 0.5 );
 317     if (newRange < 0)
 318       newRange = 0;
 319
 320     m_yScrollPosition = wxMin(newRange, m_yScrollPosition);
 321
 322         // Calculate page size i.e. number of scroll units you get on the
 323         // current client window
 324     int noPagePositions = (int) ( (h/(float)m_yScrollPixelsPerLine) + 0.5 );
 325     if (noPagePositions < 1)
 326       noPagePositions = 1;
 327
 328     SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, newRange);
 329     SetScrollPageSize(wxVERTICAL, noPagePositions);
 330   }
 331   else
 332   {
 333     m_yScrollPosition = 0;
 334     SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);  // Robert Roebling
 335   }
 336
 337 }
 338
 339 // Default OnSize resets scrollbars, if any
 340 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 341 {
 342 #if wxUSE_CONSTRAINTS
 343   if (GetAutoLayout())
 344     Layout();
 345 #endif
 346
 347   AdjustScrollbars();
 348 }
 349
 350 // This calls OnDraw, having adjusted the origin according to the current
 351 // scroll position
 352 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 353 {
 354         wxPaintDC dc(this);
 355         PrepareDC(dc);
 356
 357         OnDraw(dc);
 358 }
 359
 360 // Override this function if you don't want to have wxScrolledWindow
 361 // automatically change the origin according to the scroll position.
 362 void wxScrolledWindow::PrepareDC(wxDC& dc)
 363 {
 364         dc.SetDeviceOrigin(- m_xScrollPosition * m_xScrollPixelsPerLine, - m_yScrollPosition * m_yScrollPixelsPerLine);
 365     dc.SetUserScale(m_scaleX, m_scaleY);
 366 }
 367
 368 #if WXWIN_COMPATIBILITY
 369 void wxScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
 370 {
 371       *x_page = GetScrollPageSize(wxHORIZONTAL);
 372       *y_page = GetScrollPageSize(wxVERTICAL);
 373 }
 374 #endif
 375
 376 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 377 {
 378       *x_unit = m_xScrollPixelsPerLine;
 379       *y_unit = m_yScrollPixelsPerLine;
 380 }
 381
 382 int wxScrolledWindow::GetScrollPageSize(int orient) const
 383 {
 384     if ( orient == wxHORIZONTAL )
 385         return m_xScrollLinesPerPage;
 386     else
 387         return m_yScrollLinesPerPage;
 388 }
 389
 390 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 391 {
 392     if ( orient == wxHORIZONTAL )
 393         m_xScrollLinesPerPage = pageSize;
 394     else
 395         m_yScrollLinesPerPage = pageSize;
 396 }
 397
 398 /*
 399  * Scroll to given position (scroll position, not pixel position)
 400  */
 401 void wxScrolledWindow::Scroll (int x_pos, int y_pos)
 402 {
 403   int old_x, old_y;
 404   ViewStart (&old_x, &old_y);
 405   if (((x_pos == -1) || (x_pos == old_x)) && ((y_pos == -1) || (y_pos == old_y)))
 406     return;
 407
 408   if (x_pos > -1)
 409     {
 410       m_xScrollPosition = x_pos;
 411       SetScrollPos (wxHORIZONTAL, x_pos, TRUE);
 412     }
 413   if (y_pos > -1)
 414     {
 415       m_yScrollPosition = y_pos;
 416       SetScrollPos (wxVERTICAL, y_pos, TRUE);
 417     }
 418   Refresh();
 419 #ifdef __WXMSW__
 420   ::UpdateWindow ((HWND) GetHWND());
 421 #endif
 422 }
 423
 424 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 425 {
 426   m_xScrollingEnabled = x_scroll;
 427   m_yScrollingEnabled = y_scroll;
 428 }
 429
 430 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 431 {
 432       *x = m_xScrollPixelsPerLine * m_xScrollLines;
 433       *y = m_yScrollPixelsPerLine * m_yScrollLines;
 434 }
 435
 436 // Where the current view starts from
 437 void wxScrolledWindow::ViewStart (int *x, int *y) const
 438 {
 439   *x = m_xScrollPosition;
 440   *y = m_yScrollPosition;
 441 }
 442
 443 void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 444 {
 445   *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 446   *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 447 }
 448
 449 void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
 450 {
 451   *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
 452   *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
 453 }
 454
 455