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 i = orient == wxVERTICAL;
  36         const int value = win->GetThumbPosition();
  37         wxScrollEvent event(eventType, win->GetId(), value, orient);
  38         event.SetEventObject(win);
  39         win->m_blockValueChanged[i] = true;
  40         win->GetEventHandler()->ProcessEvent(event);
  41         if (!win->m_isScrolling)
  42         {
  43             wxScrollEvent event(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
  44             event.SetEventObject(win);
  45             win->GetEventHandler()->ProcessEvent(event);
  46         }
  47         win->m_blockValueChanged[i] = false;
  48     }
  49 }
  50 }
  51
  52 //-----------------------------------------------------------------------------
  53 // "button_press_event" from scrollbar
  54 //-----------------------------------------------------------------------------
  55
  56 extern "C" {
  57 static gboolean
  58 gtk_button_press_event(GtkRange*, GdkEventButton*, wxScrollBar* win)
  59 {
  60     win->m_mouseButtonDown = true;
  61     return false;
  62 }
  63 }
  64
  65 //-----------------------------------------------------------------------------
  66 // "event_after" from scrollbar
  67 //-----------------------------------------------------------------------------
  68
  69 extern "C" {
  70 static void
  71 gtk_event_after(GtkRange* range, GdkEvent* event, wxScrollBar* win)
  72 {
  73     if (event->type == GDK_BUTTON_RELEASE)
  74     {
  75         g_signal_handlers_block_by_func(range, (void*)gtk_event_after, win);
  76
  77         const int value = win->GetThumbPosition();
  78         const int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
  79
  80         wxScrollEvent event(wxEVT_SCROLL_THUMBRELEASE, win->GetId(), value, orient);
  81         event.SetEventObject(win);
  82         win->GetEventHandler()->ProcessEvent(event);
  83
  84         wxScrollEvent event2(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
  85         event2.SetEventObject(win);
  86         win->GetEventHandler()->ProcessEvent(event2);
  87     }
  88 }
  89 }
  90
  91 //-----------------------------------------------------------------------------
  92 // "button_release_event" from scrollbar
  93 //-----------------------------------------------------------------------------
  94
  95 extern "C" {
  96 static gboolean
  97 gtk_button_release_event(GtkRange* range, GdkEventButton*, wxScrollBar* win)
  98 {
  99     win->m_mouseButtonDown = false;
 100     // If thumb tracking
 101     if (win->m_isScrolling)
 102     {
 103         win->m_isScrolling = false;
 104         // Hook up handler to send thumb release event after this emission is finished.
 105         // To allow setting scroll position from event handler, sending event must
 106         // be deferred until after the GtkRange handler for this signal has run
 107         g_signal_handlers_unblock_by_func(range, (void*)gtk_event_after, win);
 108     }
 109
 110     return false;
 111 }
 112 }
 113
 114 //-----------------------------------------------------------------------------
 115 // wxScrollBar
 116 //-----------------------------------------------------------------------------
 117
 118 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 119
 120 wxScrollBar::wxScrollBar()
 121 {
 122 }
 123
 124 wxScrollBar::~wxScrollBar()
 125 {
 126 }
 127
 128 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 129            const wxPoint& pos, const wxSize& size,
 130            long style, const wxValidator& validator, const wxString& name )
 131 {
 132     m_needParent = true;
 133
 134     if (!PreCreation( parent, pos, size ) ||
 135         !CreateBase( parent, id, pos, size, style, validator, name ))
 136     {
 137         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 138         return false;
 139     }
 140
 141     const bool isVertical = (style & wxSB_VERTICAL) != 0;
 142     if (isVertical)
 143         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 144     else
 145         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 146
 147     m_scrollBar[int(isVertical)] = (GtkRange*)m_widget;
 148
 149     g_signal_connect(m_widget, "value_changed",
 150                      G_CALLBACK(gtk_value_changed), this);
 151     g_signal_connect(m_widget, "button_press_event",
 152                      G_CALLBACK(gtk_button_press_event), this);
 153     g_signal_connect(m_widget, "button_release_event",
 154                      G_CALLBACK(gtk_button_release_event), this);
 155
 156     gulong handler_id;
 157     handler_id = g_signal_connect(
 158         m_widget, "event_after", G_CALLBACK(gtk_event_after), this);
 159     g_signal_handler_block(m_widget, handler_id);
 160
 161     m_parent->DoAddChild( this );
 162
 163     PostCreation(size);
 164
 165     return true;
 166 }
 167
 168 int wxScrollBar::GetThumbPosition() const
 169 {
 170     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 171     return int(adj->value + 0.5);
 172 }
 173
 174 int wxScrollBar::GetThumbSize() const
 175 {
 176     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 177     return int(adj->page_size);
 178 }
 179
 180 int wxScrollBar::GetPageSize() const
 181 {
 182     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 183     return int(adj->page_increment);
 184 }
 185
 186 int wxScrollBar::GetRange() const
 187 {
 188     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 189     return int(adj->upper);
 190 }
 191
 192 void wxScrollBar::SetThumbPosition( int viewStart )
 193 {
 194     if (GetThumbPosition() != viewStart)
 195     {
 196         GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 197         const int i = (GtkRange*)m_widget == m_scrollBar[1];
 198         const int max = int(adj->upper - adj->page_size);
 199         if (viewStart > max)
 200             viewStart = max;
 201         if (viewStart < 0)
 202             viewStart = 0;
 203
 204         m_scrollPos[i] =
 205         adj->value = viewStart;
 206         // If a "value_changed" signal emission is not already in progress
 207         if (!m_blockValueChanged[i])
 208         {
 209             gtk_adjustment_value_changed(adj);
 210         }
 211     }
 212 }
 213
 214 void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageSize, bool)
 215 {
 216     if (range == 0)
 217     {
 218         // GtkRange requires upper > lower
 219         range =
 220         thumbSize = 1;
 221     }
 222     if (position > range - thumbSize)
 223         position = range - thumbSize;
 224     if (position < 0)
 225         position = 0;
 226     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
 227     adj->step_increment = 1;
 228     adj->page_increment = pageSize;
 229     adj->page_size = thumbSize;
 230     adj->upper = range;
 231     SetThumbPosition(position);
 232     gtk_adjustment_changed(adj);
 233 }
 234
 235 void wxScrollBar::SetPageSize( int pageLength )
 236 {
 237     SetScrollbar(GetThumbPosition(), GetThumbSize(), GetRange(), pageLength);
 238 }
 239
 240 void wxScrollBar::SetRange(int range)
 241 {
 242     SetScrollbar(GetThumbPosition(), GetThumbSize(), range, GetPageSize());
 243 }
 244
 245 GdkWindow *wxScrollBar::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
 246 {
 247     return m_widget->window;
 248 }
 249
 250 // static
 251 wxVisualAttributes
 252 wxScrollBar::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 253 {
 254     return GetDefaultAttributesFromGTKWidget(gtk_vscrollbar_new);
 255 }
 256
 257 #endif // wxUSE_SCROLLBAR