src/gtk/scrolbar.cpp

   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 #ifndef WX_PRECOMP
  18     #include "wx/utils.h"
  19 #endif
  20
  21 #include "wx/gtk/private.h"
  22
  23 //-----------------------------------------------------------------------------
  24 // "value_changed" from scrollbar
  25 //-----------------------------------------------------------------------------
  26
  27 extern "C" {
  28 static void
  29 gtk_value_changed(GtkRange* range, wxScrollBar* win)
  30 {
  31     wxEventType eventType = win->GetScrollEventType(range);
  32     if (eventType != wxEVT_NULL)
  33     {
  34         const int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
  35         const int value = win->GetThumbPosition();
  36         wxScrollEvent event(eventType, win->GetId(), value, orient);
  37         event.SetEventObject(win);
  38         win->GetEventHandler()->ProcessEvent(event);
  39         if (!win->m_isScrolling)
  40         {
  41             wxScrollEvent event(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
  42             event.SetEventObject(win);
  43             win->GetEventHandler()->ProcessEvent(event);
  44         }
  45     }
  46 }
  47 }
  48
  49 //-----------------------------------------------------------------------------
  50 // "button_press_event" from scrollbar
  51 //-----------------------------------------------------------------------------
  52
  53 extern "C" {
  54 static gboolean
  55 gtk_button_press_event(GtkRange*, GdkEventButton*, wxScrollBar* win)
  56 {
  57     win->m_mouseButtonDown = true;
  58     return false;
  59 }
  60 }
  61
  62 //-----------------------------------------------------------------------------
  63 // "event_after" from scrollbar
  64 //-----------------------------------------------------------------------------
  65
  66 extern "C" {
  67 static void
  68 gtk_event_after(GtkRange* range, GdkEvent* event, wxScrollBar* win)
  69 {
  70     if (event->type == GDK_BUTTON_RELEASE)
  71     {
  72         g_signal_handlers_block_by_func(range, (void*)gtk_event_after, win);
  73
  74         const int value = win->GetThumbPosition();
  75         const int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
  76
  77         wxScrollEvent event(wxEVT_SCROLL_THUMBRELEASE, win->GetId(), value, orient);
  78         event.SetEventObject(win);
  79         win->GetEventHandler()->ProcessEvent(event);
  80
  81         wxScrollEvent event2(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
  82         event2.SetEventObject(win);
  83         win->GetEventHandler()->ProcessEvent(event2);
  84     }
  85 }
  86 }
  87
  88 //-----------------------------------------------------------------------------
  89 // "button_release_event" from scrollbar
  90 //-----------------------------------------------------------------------------
  91
  92 extern "C" {
  93 static gboolean
  94 gtk_button_release_event(GtkRange* range, GdkEventButton*, wxScrollBar* win)
  95 {
  96     win->m_mouseButtonDown = false;
  97     // If thumb tracking
  98     if (win->m_isScrolling)
  99     {
 100         win->m_isScrolling = false;
 101         // Hook up handler to send thumb release event after this emission is finished.
 102         // To allow setting scroll position from event handler, sending event must
 103         // be deferred until after the GtkRange handler for this signal has run
 104         g_signal_handlers_unblock_by_func(range, (void*)gtk_event_after, win);
 105     }
 106
 107     return false;
 108 }
 109 }
 110
 111 //-----------------------------------------------------------------------------
 112 // wxScrollBar
 113 //-----------------------------------------------------------------------------
 114
 115 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 116
 117 wxScrollBar::wxScrollBar()
 118 {
 119 }
 120
 121 wxScrollBar::~wxScrollBar()
 122 {
 123 }
 124
 125 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 126            const wxPoint& pos, const wxSize& size,
 127            long style, const wxValidator& validator, const wxString& name )
 128 {
 129     if (!PreCreation( parent, pos, size ) ||
 130         !CreateBase( parent, id, pos, size, style, validator, name ))
 131     {
 132         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 133         return false;
 134     }
 135
 136     const bool isVertical = (style & wxSB_VERTICAL) != 0;
 137     if (isVertical)
 138         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 139     else
 140         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 141
 142     m_scrollBar[int(isVertical)] = (GtkRange*)m_widget;
 143
 144     g_signal_connect_after(m_widget, "value_changed",
 145                      G_CALLBACK(gtk_value_changed), this);
 146     g_signal_connect(m_widget, "button_press_event",
 147                      G_CALLBACK(gtk_button_press_event), this);
 148     g_signal_connect(m_widget, "button_release_event",
 149                      G_CALLBACK(gtk_button_release_event), this);
 150
 151     gulong handler_id;
 152     handler_id = g_signal_connect(
 153         m_widget, "event_after", G_CALLBACK(gtk_event_after), this);
 154     g_signal_handler_block(m_widget, handler_id);
 155
 156     m_parent->DoAddChild( this );
 157
 158     PostCreation(size);
 159
 160     return true;
 161 }
 162
 163 int wxScrollBar::GetThumbPosition() const
 164 {
 165     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 166     return int(adj->value + 0.5);
 167 }
 168
 169 int wxScrollBar::GetThumbSize() const
 170 {
 171     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 172     return int(adj->page_size);
 173 }
 174
 175 int wxScrollBar::GetPageSize() const
 176 {
 177     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 178     return int(adj->page_increment);
 179 }
 180
 181 int wxScrollBar::GetRange() const
 182 {
 183     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 184     return int(adj->upper);
 185 }
 186
 187 void wxScrollBar::SetThumbPosition( int viewStart )
 188 {
 189     if (GetThumbPosition() != viewStart)
 190     {
 191         GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 192         const int i = (GtkRange*)m_widget == m_scrollBar[1];
 193         const int max = int(adj->upper - adj->page_size);
 194         if (viewStart > max)
 195             viewStart = max;
 196         if (viewStart < 0)
 197             viewStart = 0;
 198
 199         m_scrollPos[i] =
 200         adj->value = viewStart;
 201
 202         g_signal_handlers_disconnect_by_func( m_widget,
 203                               (gpointer)gtk_value_changed, this);
 204
 205         gtk_adjustment_value_changed(adj);
 206
 207         g_signal_connect_after(m_widget, "value_changed",
 208                      G_CALLBACK(gtk_value_changed), this);
 209     }
 210 }
 211
 212 void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageSize, bool)
 213 {
 214     if (range == 0)
 215     {
 216         // GtkRange requires upper > lower
 217         range =
 218         thumbSize = 1;
 219     }
 220     if (position > range - thumbSize)
 221         position = range - thumbSize;
 222     if (position < 0)
 223         position = 0;
 224     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 225     adj->step_increment = 1;
 226     adj->page_increment = pageSize;
 227     adj->page_size = thumbSize;
 228     adj->upper = range;
 229     SetThumbPosition(position);
 230     gtk_adjustment_changed(adj);
 231 }
 232
 233 void wxScrollBar::SetPageSize( int pageLength )
 234 {
 235     SetScrollbar(GetThumbPosition(), GetThumbSize(), GetRange(), pageLength);
 236 }
 237
 238 void wxScrollBar::SetRange(int range)
 239 {
 240     SetScrollbar(GetThumbPosition(), GetThumbSize(), range, GetPageSize());
 241 }
 242
 243 GdkWindow *wxScrollBar::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
 244 {
 245     return m_widget->window;
 246 }
 247
 248 // static
 249 wxVisualAttributes
 250 wxScrollBar::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 251 {
 252     return GetDefaultAttributesFromGTKWidget(gtk_vscrollbar_new);
 253 }
 254
 255 #endif // wxUSE_SCROLLBAR