| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/gtk/scrolbar.cpp |
| 3 | // Purpose: |
| 4 | // Author: Robert Roebling |
| 5 | // Id: $Id$ |
| 6 | // Copyright: (c) 1998 Robert Roebling |
| 7 | // Licence: wxWindows licence |
| 8 | ///////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | // For compilers that support precompilation, includes "wx.h". |
| 11 | #include "wx/wxprec.h" |
| 12 | |
| 13 | #if wxUSE_SCROLLBAR |
| 14 | |
| 15 | #include "wx/scrolbar.h" |
| 16 | |
| 17 | #include "wx/utils.h" |
| 18 | #include "wx/math.h" |
| 19 | #include "wx/gtk/private.h" |
| 20 | |
| 21 | //----------------------------------------------------------------------------- |
| 22 | // idle system |
| 23 | //----------------------------------------------------------------------------- |
| 24 | |
| 25 | extern void wxapp_install_idle_handler(); |
| 26 | extern bool g_isIdle; |
| 27 | |
| 28 | //----------------------------------------------------------------------------- |
| 29 | // data |
| 30 | //----------------------------------------------------------------------------- |
| 31 | |
| 32 | extern bool g_blockEventsOnDrag; |
| 33 | static wxEventType g_currentUpDownEvent = wxEVT_NULL; |
| 34 | |
| 35 | static const float sensitivity = 0.02; |
| 36 | |
| 37 | //----------------------------------------------------------------------------- |
| 38 | // "value_changed" |
| 39 | //----------------------------------------------------------------------------- |
| 40 | |
| 41 | // FIXME: is GtkScrollType really passed to us as 2nd argument? |
| 42 | |
| 43 | extern "C" { |
| 44 | static void gtk_scrollbar_callback( GtkAdjustment *adjust, |
| 45 | SCROLLBAR_CBACK_ARG |
| 46 | wxScrollBar *win ) |
| 47 | { |
| 48 | if (g_isIdle) wxapp_install_idle_handler(); |
| 49 | |
| 50 | if (!win->m_hasVMT) return; |
| 51 | if (g_blockEventsOnDrag) return; |
| 52 | |
| 53 | float diff = adjust->value - win->m_oldPos; |
| 54 | if (fabs(diff) < sensitivity) return; |
| 55 | |
| 56 | win->m_oldPos = adjust->value; |
| 57 | |
| 58 | wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget)); |
| 59 | |
| 60 | double dvalue = adjust->value; |
| 61 | int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5); |
| 62 | |
| 63 | int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL; |
| 64 | |
| 65 | // throw a LINEUP / LINEDOWN event if necessary |
| 66 | if (g_currentUpDownEvent != wxEVT_NULL) |
| 67 | { |
| 68 | wxScrollEvent event( g_currentUpDownEvent, win->GetId(), value, orient ); |
| 69 | event.SetEventObject( win ); |
| 70 | win->GetEventHandler()->ProcessEvent( event ); |
| 71 | } |
| 72 | |
| 73 | // throw other event (wxEVT_SCROLL_THUMBTRACK) |
| 74 | wxScrollEvent event( command, win->GetId(), value, orient ); |
| 75 | event.SetEventObject( win ); |
| 76 | win->GetEventHandler()->ProcessEvent( event ); |
| 77 | |
| 78 | /* |
| 79 | wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() ); |
| 80 | cevent.SetEventObject( win ); |
| 81 | win->ProcessEvent( cevent ); |
| 82 | */ |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | //----------------------------------------------------------------------------- |
| 87 | // "button_press_event" from slider |
| 88 | //----------------------------------------------------------------------------- |
| 89 | extern "C" { |
| 90 | static gint gtk_scrollbar_button_press_callback( GtkRange *widget, |
| 91 | GdkEventButton *gdk_event, |
| 92 | wxScrollBar *win ) |
| 93 | { |
| 94 | if (g_isIdle) wxapp_install_idle_handler(); |
| 95 | |
| 96 | // check if a LINEUP/LINEDOWN event must be thrown |
| 97 | // I suppose here the size of scrollbar top/bottom buttons is 16px height |
| 98 | if (gdk_event->type == GDK_BUTTON_PRESS && gdk_event->button == 1) |
| 99 | { |
| 100 | int scroll_height, mouse_pos; |
| 101 | |
| 102 | // get the mouse position when the click is done |
| 103 | if (win->HasFlag(wxSB_VERTICAL)) |
| 104 | { |
| 105 | scroll_height = GTK_WIDGET(widget)->allocation.height - 16; |
| 106 | mouse_pos = (int)gdk_event->y; |
| 107 | } |
| 108 | else |
| 109 | { |
| 110 | scroll_height = GTK_WIDGET(widget)->allocation.width - 16; |
| 111 | mouse_pos = (int)gdk_event->x; |
| 112 | } |
| 113 | |
| 114 | // compare mouse position to scrollbar height |
| 115 | if (mouse_pos > scroll_height) |
| 116 | g_currentUpDownEvent = wxEVT_SCROLL_LINEDOWN; |
| 117 | else if (mouse_pos < 16) |
| 118 | g_currentUpDownEvent = wxEVT_SCROLL_LINEUP; |
| 119 | } |
| 120 | |
| 121 | #ifndef __WXGTK20__ |
| 122 | // There is no slider field any more |
| 123 | win->m_isScrolling = (gdk_event->window == widget->slider); |
| 124 | #endif |
| 125 | |
| 126 | return FALSE; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | //----------------------------------------------------------------------------- |
| 131 | // "button_release_event" from slider |
| 132 | //----------------------------------------------------------------------------- |
| 133 | |
| 134 | extern "C" { |
| 135 | static gint |
| 136 | gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget), |
| 137 | GdkEventButton *WXUNUSED(gdk_event), |
| 138 | wxScrollBar *win ) |
| 139 | { |
| 140 | if (g_isIdle) |
| 141 | wxapp_install_idle_handler(); |
| 142 | |
| 143 | if (win->m_isScrolling) |
| 144 | { |
| 145 | wxEventType command = wxEVT_SCROLL_THUMBRELEASE; |
| 146 | int value = (int)ceil(win->m_adjust->value); |
| 147 | int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL; |
| 148 | |
| 149 | wxScrollEvent event( command, win->GetId(), value, orient ); |
| 150 | event.SetEventObject( win ); |
| 151 | win->GetEventHandler()->ProcessEvent( event ); |
| 152 | } |
| 153 | |
| 154 | win->m_isScrolling = false; |
| 155 | |
| 156 | // reset the LINEUP/LINEDOWN flag when the mouse button is released |
| 157 | g_currentUpDownEvent = wxEVT_NULL; |
| 158 | |
| 159 | return FALSE; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | //----------------------------------------------------------------------------- |
| 164 | // wxScrollBar |
| 165 | //----------------------------------------------------------------------------- |
| 166 | |
| 167 | IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl) |
| 168 | |
| 169 | wxScrollBar::~wxScrollBar() |
| 170 | { |
| 171 | } |
| 172 | |
| 173 | bool wxScrollBar::Create(wxWindow *parent, wxWindowID id, |
| 174 | const wxPoint& pos, const wxSize& size, |
| 175 | long style, const wxValidator& validator, const wxString& name ) |
| 176 | { |
| 177 | m_needParent = true; |
| 178 | m_acceptsFocus = true; |
| 179 | |
| 180 | if (!PreCreation( parent, pos, size ) || |
| 181 | !CreateBase( parent, id, pos, size, style, validator, name )) |
| 182 | { |
| 183 | wxFAIL_MSG( wxT("wxScrollBar creation failed") ); |
| 184 | return false; |
| 185 | } |
| 186 | |
| 187 | m_oldPos = 0.0; |
| 188 | |
| 189 | if ((style & wxSB_VERTICAL) == wxSB_VERTICAL) |
| 190 | m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL ); |
| 191 | else |
| 192 | m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL ); |
| 193 | |
| 194 | m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) ); |
| 195 | |
| 196 | gtk_signal_connect( GTK_OBJECT(m_adjust), |
| 197 | "value_changed", |
| 198 | (GtkSignalFunc) gtk_scrollbar_callback, |
| 199 | (gpointer) this ); |
| 200 | gtk_signal_connect( GTK_OBJECT(m_widget), |
| 201 | "button_press_event", |
| 202 | (GtkSignalFunc)gtk_scrollbar_button_press_callback, |
| 203 | (gpointer) this ); |
| 204 | gtk_signal_connect( GTK_OBJECT(m_widget), |
| 205 | "button_release_event", |
| 206 | (GtkSignalFunc)gtk_scrollbar_button_release_callback, |
| 207 | (gpointer) this ); |
| 208 | |
| 209 | m_parent->DoAddChild( this ); |
| 210 | |
| 211 | PostCreation(size); |
| 212 | |
| 213 | return true; |
| 214 | } |
| 215 | |
| 216 | int wxScrollBar::GetThumbPosition() const |
| 217 | { |
| 218 | double val = m_adjust->value; |
| 219 | return (int)(val < 0 ? val - 0.5 : val + 0.5); |
| 220 | } |
| 221 | |
| 222 | int wxScrollBar::GetThumbSize() const |
| 223 | { |
| 224 | return (int)(m_adjust->page_size+0.5); |
| 225 | } |
| 226 | |
| 227 | int wxScrollBar::GetPageSize() const |
| 228 | { |
| 229 | return (int)(m_adjust->page_increment+0.5); |
| 230 | } |
| 231 | |
| 232 | int wxScrollBar::GetRange() const |
| 233 | { |
| 234 | return (int)(m_adjust->upper+0.5); |
| 235 | } |
| 236 | |
| 237 | void wxScrollBar::SetThumbPosition( int viewStart ) |
| 238 | { |
| 239 | if (m_isScrolling) return; |
| 240 | |
| 241 | float fpos = (float)viewStart; |
| 242 | m_oldPos = fpos; |
| 243 | if (fabs(fpos-m_adjust->value) < 0.2) return; |
| 244 | m_adjust->value = fpos; |
| 245 | |
| 246 | gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust), |
| 247 | (GtkSignalFunc) gtk_scrollbar_callback, |
| 248 | (gpointer) this ); |
| 249 | |
| 250 | gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" ); |
| 251 | |
| 252 | gtk_signal_connect( GTK_OBJECT(m_adjust), |
| 253 | "value_changed", |
| 254 | (GtkSignalFunc) gtk_scrollbar_callback, |
| 255 | (gpointer) this ); |
| 256 | } |
| 257 | |
| 258 | void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize, |
| 259 | bool WXUNUSED(refresh) ) |
| 260 | { |
| 261 | float fpos = (float)position; |
| 262 | float frange = (float)range; |
| 263 | float fthumb = (float)thumbSize; |
| 264 | float fpage = (float)pageSize; |
| 265 | |
| 266 | if ((fabs(frange-m_adjust->upper) < 0.2) && |
| 267 | (fabs(fthumb-m_adjust->page_size) < 0.2) && |
| 268 | (fabs(fpage-m_adjust->page_increment) < 0.2)) |
| 269 | { |
| 270 | SetThumbPosition( position ); |
| 271 | return; |
| 272 | } |
| 273 | |
| 274 | m_oldPos = fpos; |
| 275 | |
| 276 | m_adjust->lower = 0.0; |
| 277 | m_adjust->upper = frange; |
| 278 | m_adjust->value = fpos; |
| 279 | m_adjust->step_increment = 1.0; |
| 280 | m_adjust->page_increment = (float)(wxMax(fpage,0)); |
| 281 | m_adjust->page_size = fthumb; |
| 282 | |
| 283 | gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" ); |
| 284 | } |
| 285 | |
| 286 | /* Backward compatibility */ |
| 287 | int wxScrollBar::GetValue() const |
| 288 | { |
| 289 | return GetThumbPosition(); |
| 290 | } |
| 291 | |
| 292 | void wxScrollBar::SetValue( int viewStart ) |
| 293 | { |
| 294 | SetThumbPosition( viewStart ); |
| 295 | } |
| 296 | |
| 297 | void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const |
| 298 | { |
| 299 | int pos = (int)(m_adjust->value+0.5); |
| 300 | int thumb = (int)(m_adjust->page_size+0.5); |
| 301 | int page = (int)(m_adjust->page_increment+0.5); |
| 302 | int range = (int)(m_adjust->upper+0.5); |
| 303 | |
| 304 | *viewStart = pos; |
| 305 | *viewLength = range; |
| 306 | *objectLength = thumb; |
| 307 | *pageLength = page; |
| 308 | } |
| 309 | |
| 310 | int wxScrollBar::GetViewLength() const |
| 311 | { |
| 312 | return (int)(m_adjust->upper+0.5); |
| 313 | } |
| 314 | |
| 315 | int wxScrollBar::GetObjectLength() const |
| 316 | { |
| 317 | return (int)(m_adjust->page_size+0.5); |
| 318 | } |
| 319 | |
| 320 | void wxScrollBar::SetPageSize( int pageLength ) |
| 321 | { |
| 322 | int pos = (int)(m_adjust->value+0.5); |
| 323 | int thumb = (int)(m_adjust->page_size+0.5); |
| 324 | int range = (int)(m_adjust->upper+0.5); |
| 325 | SetScrollbar( pos, thumb, range, pageLength ); |
| 326 | } |
| 327 | |
| 328 | void wxScrollBar::SetObjectLength( int objectLength ) |
| 329 | { |
| 330 | int pos = (int)(m_adjust->value+0.5); |
| 331 | int page = (int)(m_adjust->page_increment+0.5); |
| 332 | int range = (int)(m_adjust->upper+0.5); |
| 333 | SetScrollbar( pos, objectLength, range, page ); |
| 334 | } |
| 335 | |
| 336 | void wxScrollBar::SetViewLength( int viewLength ) |
| 337 | { |
| 338 | int pos = (int)(m_adjust->value+0.5); |
| 339 | int thumb = (int)(m_adjust->page_size+0.5); |
| 340 | int page = (int)(m_adjust->page_increment+0.5); |
| 341 | SetScrollbar( pos, thumb, viewLength, page ); |
| 342 | } |
| 343 | |
| 344 | bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window ) |
| 345 | { |
| 346 | GtkRange *range = GTK_RANGE(m_widget); |
| 347 | return ( (window == GTK_WIDGET(range)->window) |
| 348 | #ifndef __WXGTK20__ |
| 349 | || (window == range->trough) |
| 350 | || (window == range->slider) |
| 351 | || (window == range->step_forw) |
| 352 | || (window == range->step_back) |
| 353 | #endif // GTK+ 1.x |
| 354 | ); |
| 355 | } |
| 356 | |
| 357 | wxSize wxScrollBar::DoGetBestSize() const |
| 358 | { |
| 359 | return wxControl::DoGetBestSize(); |
| 360 | } |
| 361 | |
| 362 | // static |
| 363 | wxVisualAttributes |
| 364 | wxScrollBar::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant)) |
| 365 | { |
| 366 | return GetDefaultAttributesFromGTKWidget(gtk_vscrollbar_new); |
| 367 | } |
| 368 | |
| 369 | #endif |