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