X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/68567a967bc8afd37a40cb9a7ee5021b9ee6cd96..2bc4cc1ead29f6de1f0576a416025edadb13d7cc:/src/gtk/slider.cpp

diff --git a/src/gtk/slider.cpp b/src/gtk/slider.cpp
index 8cdeb4cc19..0527106ad9 100644
--- a/src/gtk/slider.cpp
+++ b/src/gtk/slider.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        gtk/slider.cpp
+// Name:        src/gtk/slider.cpp
 // Purpose:
 // Author:      Robert Roebling
 // Id:          $Id$
@@ -10,20 +10,17 @@
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
-#include "wx/slider.h"
-
 #if wxUSE_SLIDER
 
-#include "wx/utils.h"
-#include "wx/math.h"
-#include "wx/gtk/private.h"
+#include "wx/slider.h"
 
-//-----------------------------------------------------------------------------
-// idle system
-//-----------------------------------------------------------------------------
+#ifndef WX_PRECOMP
+    #include "wx/utils.h"
+    #include "wx/math.h"
+#endif
 
-extern void wxapp_install_idle_handler();
-extern bool g_isIdle;
+#include <gtk/gtk.h>
+#include "wx/gtk/private/gtk2-compat.h"
 
 //-----------------------------------------------------------------------------
 // data
@@ -35,314 +32,497 @@ extern bool g_blockEventsOnDrag;
 // helper functions
 // ----------------------------------------------------------------------------
 
-// compare 2 adjustment values up to some (hardcoded) precision
-static inline bool AreSameAdjustValues(double x, double y)
+// process a scroll event
+static void
+ProcessScrollEvent(wxSlider *win, wxEventType evtType)
 {
-    return fabs(x - y) < 0.02;
+    const int orient = win->HasFlag(wxSL_VERTICAL) ? wxVERTICAL
+                                                   : wxHORIZONTAL;
+
+    const int value = win->GetValue();
+
+    // if we have any "special" event (i.e. the value changed by a line or a
+    // page), send this specific event first
+    if ( evtType != wxEVT_NULL )
+    {
+        wxScrollEvent event( evtType, win->GetId(), value, orient );
+        event.SetEventObject( win );
+        win->HandleWindowEvent( event );
+    }
+
+    // but, in any case, except if we're dragging the slider (and so the change
+    // is not definitive), send a generic "changed" event
+    if ( evtType != wxEVT_SCROLL_THUMBTRACK )
+    {
+        wxScrollEvent event(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
+        event.SetEventObject( win );
+        win->HandleWindowEvent( event );
+    }
+
+    // and also generate a command event for compatibility
+    wxCommandEvent event( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
+    event.SetEventObject( win );
+    event.SetInt( value );
+    win->HandleWindowEvent( event );
 }
 
-static inline int AdjustValueToInt(double x)
+static inline wxEventType GtkScrollTypeToWx(int scrollType)
 {
-    // we want to round to the nearest integer, i.e. 0.9 is rounded to 1 and
-    // -0.9 is rounded to -1
-    return (int)(x < 0 ? x - 0.5 : x + 0.5);
+    wxEventType eventType;
+    switch (scrollType)
+    {
+    case GTK_SCROLL_STEP_BACKWARD:
+    case GTK_SCROLL_STEP_LEFT:
+    case GTK_SCROLL_STEP_UP:
+        eventType = wxEVT_SCROLL_LINEUP;
+        break;
+    case GTK_SCROLL_STEP_DOWN:
+    case GTK_SCROLL_STEP_FORWARD:
+    case GTK_SCROLL_STEP_RIGHT:
+        eventType = wxEVT_SCROLL_LINEDOWN;
+        break;
+    case GTK_SCROLL_PAGE_BACKWARD:
+    case GTK_SCROLL_PAGE_LEFT:
+    case GTK_SCROLL_PAGE_UP:
+        eventType = wxEVT_SCROLL_PAGEUP;
+        break;
+    case GTK_SCROLL_PAGE_DOWN:
+    case GTK_SCROLL_PAGE_FORWARD:
+    case GTK_SCROLL_PAGE_RIGHT:
+        eventType = wxEVT_SCROLL_PAGEDOWN;
+        break;
+    case GTK_SCROLL_START:
+        eventType = wxEVT_SCROLL_TOP;
+        break;
+    case GTK_SCROLL_END:
+        eventType = wxEVT_SCROLL_BOTTOM;
+        break;
+    case GTK_SCROLL_JUMP:
+        eventType = wxEVT_SCROLL_THUMBTRACK;
+        break;
+    default:
+        wxFAIL_MSG(wxT("Unknown GtkScrollType"));
+        eventType = wxEVT_NULL;
+        break;
+    }
+    return eventType;
 }
 
-// process a scroll event
+// Determine if increment is the same as +/-x, allowing for some small
+//   difference due to possible inexactness in floating point arithmetic
+static inline bool IsScrollIncrement(double increment, double x)
+{
+    wxASSERT(increment > 0);
+    const double tolerance = 1.0 / 1024;
+    return fabs(increment - fabs(x)) < tolerance;
+}
+
+//-----------------------------------------------------------------------------
+// "value_changed"
+//-----------------------------------------------------------------------------
+
+extern "C" {
 static void
-ProcessScrollEvent(wxSlider *win, wxEventType evtType, double dvalue)
+gtk_value_changed(GtkRange* range, wxSlider* win)
 {
-    int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL
-                                                           : wxHORIZONTAL;
+    const double value = gtk_range_get_value(range);
+    const double oldPos = win->m_pos;
+    win->m_pos = value;
 
-    int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
-    wxScrollEvent event( evtType, win->GetId(), value, orient );
-    event.SetEventObject( win );
-    win->GetEventHandler()->ProcessEvent( event );
+    if (!win->m_hasVMT || g_blockEventsOnDrag)
+        return;
 
-    if ( evtType != wxEVT_SCROLL_THUMBTRACK )
+    if (win->GTKEventsDisabled())
     {
-        wxScrollEvent event2(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
-        event2.SetEventObject( win );
-        win->GetEventHandler()->ProcessEvent( event2 );
+        win->m_scrollEventType = GTK_SCROLL_NONE;
+        return;
     }
 
-    wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
-    cevent.SetEventObject( win );
-    cevent.SetInt( value );
-    win->GetEventHandler()->ProcessEvent( cevent );
+    wxEventType eventType = wxEVT_NULL;
+    if (win->m_isScrolling)
+    {
+        eventType = wxEVT_SCROLL_THUMBTRACK;
+    }
+    else if (win->m_scrollEventType != GTK_SCROLL_NONE)
+    {
+        // Scroll event from "move-slider" (keyboard)
+        eventType = GtkScrollTypeToWx(win->m_scrollEventType);
+    }
+    else if (win->m_mouseButtonDown)
+    {
+        // Difference from last change event
+        const double diff = value - oldPos;
+        const bool isDown = diff > 0;
+
+        GtkAdjustment* adj = gtk_range_get_adjustment(range);
+        if (IsScrollIncrement(gtk_adjustment_get_page_increment(adj), diff))
+        {
+            eventType = isDown ? wxEVT_SCROLL_PAGEDOWN : wxEVT_SCROLL_PAGEUP;
+        }
+        else if (wxIsSameDouble(value, 0))
+        {
+            eventType = wxEVT_SCROLL_PAGEUP;
+        }
+        else if (wxIsSameDouble(value, gtk_adjustment_get_upper(adj)))
+        {
+            eventType = wxEVT_SCROLL_PAGEDOWN;
+        }
+        else
+        {
+            // Assume track event
+            eventType = wxEVT_SCROLL_THUMBTRACK;
+            // Remember that we're tracking
+            win->m_isScrolling = true;
+        }
+    }
+
+    win->m_scrollEventType = GTK_SCROLL_NONE;
+
+    // If integral position has changed
+    if (wxRound(oldPos) != wxRound(value))
+    {
+        ProcessScrollEvent(win, eventType);
+        win->m_needThumbRelease = eventType == wxEVT_SCROLL_THUMBTRACK;
+    }
+}
 }
 
 //-----------------------------------------------------------------------------
-// "value_changed"
+// "move_slider" (keyboard event)
 //-----------------------------------------------------------------------------
 
 extern "C" {
-static void gtk_slider_callback( GtkAdjustment *adjust,
-                                 SCROLLBAR_CBACK_ARG
-                                 wxSlider *win )
+static void
+gtk_move_slider(GtkRange*, GtkScrollType scrollType, wxSlider* win)
 {
-    if (g_isIdle) wxapp_install_idle_handler();
-
-    if (!win->m_hasVMT) return;
-    if (g_blockEventsOnDrag) return;
+    // Save keyboard scroll type for "value_changed" handler
+    win->m_scrollEventType = scrollType;
+}
+}
 
-    const double dvalue = adjust->value;
-    const double diff = dvalue - win->m_oldPos;
-    if ( AreSameAdjustValues(diff, 0) )
-        return;
+//-----------------------------------------------------------------------------
+// "button_press_event"
+//-----------------------------------------------------------------------------
 
-    wxEventType evtType;
-    if ( win->m_isScrolling )
-        evtType = wxEVT_SCROLL_THUMBTRACK;
-    // it could seem that UP/DOWN are inversed but this is what wxMSW does
-    else if ( AreSameAdjustValues(diff, adjust->step_increment) )
-        evtType = wxEVT_SCROLL_LINEDOWN;
-    else if ( AreSameAdjustValues(diff, -adjust->step_increment) )
-        evtType = wxEVT_SCROLL_LINEUP;
-    else if ( AreSameAdjustValues(diff, adjust->page_increment) )
-        evtType = wxEVT_SCROLL_PAGEDOWN;
-    else if ( AreSameAdjustValues(diff, -adjust->page_increment) )
-        evtType = wxEVT_SCROLL_PAGEUP;
-    else if ( AreSameAdjustValues(adjust->value, adjust->lower) )
-        evtType = wxEVT_SCROLL_TOP;
-    else if ( AreSameAdjustValues(adjust->value, adjust->upper) )
-        evtType = wxEVT_SCROLL_BOTTOM;
-
-    ProcessScrollEvent(win, evtType, dvalue);
-
-    win->m_oldPos = dvalue;
-}
-
-static gint gtk_slider_button_press_callback( GtkWidget * /* widget */,
-                                              GdkEventButton * /* gdk_event */,
-                                              wxWindowGTK *win)
+extern "C" {
+static gboolean
+gtk_button_press_event(GtkWidget*, GdkEventButton*, wxSlider* win)
 {
-    // indicate that the thumb is being dragged with the mouse
-    win->m_isScrolling = true;
+    win->m_mouseButtonDown = true;
 
-    return FALSE;
+    return false;
+}
 }
 
-static gint gtk_slider_button_release_callback( GtkWidget *scale,
-                                                GdkEventButton * /* gdk_event */,
-                                                wxSlider *win)
+//-----------------------------------------------------------------------------
+// "event_after"
+//-----------------------------------------------------------------------------
+
+extern "C" {
+static void
+gtk_event_after(GtkRange* range, GdkEvent* event, wxSlider* win)
 {
-    // not scrolling any longer
-    win->m_isScrolling = false;
+    if (event->type == GDK_BUTTON_RELEASE)
+    {
+        g_signal_handlers_block_by_func(range, (gpointer) gtk_event_after, win);
 
-    ProcessScrollEvent(win, wxEVT_SCROLL_THUMBRELEASE,
-                       GTK_RANGE(scale)->adjustment->value);
+        if (win->m_needThumbRelease)
+        {
+            win->m_needThumbRelease = false;
+            ProcessScrollEvent(win, wxEVT_SCROLL_THUMBRELEASE);
+        }
+        // Keep slider at an integral position
+        win->GTKDisableEvents();
+        gtk_range_set_value(GTK_RANGE (win->m_scale), win->GetValue());
+        win->GTKEnableEvents();
+    }
+}
+}
+
+//-----------------------------------------------------------------------------
+// "button_release_event"
+//-----------------------------------------------------------------------------
 
-    return FALSE;
+extern "C" {
+static gboolean
+gtk_button_release_event(GtkRange* range, GdkEventButton*, wxSlider* win)
+{
+    win->m_mouseButtonDown = false;
+    if (win->m_isScrolling)
+    {
+        win->m_isScrolling = false;
+        g_signal_handlers_unblock_by_func(range, (gpointer) gtk_event_after, win);
+    }
+    return false;
+}
 }
 
+//-----------------------------------------------------------------------------
+// "format_value"
+//-----------------------------------------------------------------------------
+
+extern "C" {
+static gchar* gtk_format_value(GtkScale*, double value, void*)
+{
+    // Format value as nearest integer
+    return g_strdup_printf("%d", wxRound(value));
+}
 }
 
 //-----------------------------------------------------------------------------
 // wxSlider
 //-----------------------------------------------------------------------------
 
-IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
+wxSlider::wxSlider()
+{
+    m_pos = 0;
+    m_scrollEventType = GTK_SCROLL_NONE;
+    m_needThumbRelease = false;
+    m_blockScrollEvent = false;
+}
 
-bool wxSlider::Create(wxWindow *parent, wxWindowID id,
-        int value, int minValue, int maxValue,
-        const wxPoint& pos, const wxSize& size,
-        long style, const wxValidator& validator, const wxString& name )
+bool wxSlider::Create(wxWindow *parent,
+                      wxWindowID id,
+                      int value,
+                      int minValue,
+                      int maxValue,
+                      const wxPoint& pos,
+                      const wxSize& size,
+                      long style,
+                      const wxValidator& validator,
+                      const wxString& name)
 {
-    m_acceptsFocus = TRUE;
-    m_needParent = TRUE;
+    m_pos = value;
+    m_scrollEventType = GTK_SCROLL_NONE;
 
     if (!PreCreation( parent, pos, size ) ||
         !CreateBase( parent, id, pos, size, style, validator, name ))
     {
         wxFAIL_MSG( wxT("wxSlider creation failed") );
-        return FALSE;
+        return false;
     }
 
-    m_oldPos = 0.0;
 
     if (style & wxSL_VERTICAL)
-        m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
+        m_scale = gtk_vscale_new( NULL );
     else
-        m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
+        m_scale = gtk_hscale_new( NULL );
+    g_object_ref(m_scale);
 
-    if (style & wxSL_LABELS)
+    if (style & wxSL_MIN_MAX_LABELS)
     {
-        gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
-        gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
+        gtk_widget_show( m_scale );
 
-        /* labels need more space and too small window will
-           cause junk to appear on the dialog */
         if (style & wxSL_VERTICAL)
+            m_widget = gtk_hbox_new(false, 0);
+        else
+            m_widget = gtk_vbox_new(false, 0);
+        g_object_ref(m_widget);
+        gtk_widget_show( m_widget );
+        gtk_container_add( GTK_CONTAINER(m_widget), m_scale );
+
+        GtkWidget *box;
+        if (style & wxSL_VERTICAL)
+            box = gtk_vbox_new(false,0);
+        else
+            box = gtk_hbox_new(false,0);
+        g_object_ref(box);
+        gtk_widget_show(box);
+        gtk_container_add( GTK_CONTAINER(m_widget), box );
+
+        m_minLabel = gtk_label_new(NULL);
+        g_object_ref(m_minLabel);
+        gtk_widget_show( m_minLabel );
+        gtk_container_add( GTK_CONTAINER(box), m_minLabel );
+        gtk_box_set_child_packing( GTK_BOX(box), m_minLabel, FALSE, FALSE, 0, GTK_PACK_START );
+
+        // expanding empty space between the min/max labels
+        GtkWidget *space = gtk_label_new(NULL);
+        g_object_ref(space);
+        gtk_widget_show( space );
+        gtk_container_add( GTK_CONTAINER(box), space );
+        gtk_box_set_child_packing( GTK_BOX(box), space, TRUE, FALSE, 0, GTK_PACK_START );
+
+        m_maxLabel = gtk_label_new(NULL);
+        g_object_ref(m_maxLabel);
+        gtk_widget_show( m_maxLabel );
+        gtk_container_add( GTK_CONTAINER(box), m_maxLabel );
+        gtk_box_set_child_packing( GTK_BOX(box), m_maxLabel, FALSE, FALSE, 0, GTK_PACK_END );
+    }
+    else
+    {
+        m_widget = m_scale;
+        m_maxLabel = NULL;
+        m_minLabel = NULL;
+    }
+
+    const bool showValueLabel = (style & wxSL_VALUE_LABEL) != 0;
+    gtk_scale_set_draw_value(GTK_SCALE (m_scale), showValueLabel );
+    if ( showValueLabel )
+    {
+        // position the label appropriately: notice that wxSL_DIRECTION flags
+        // specify the position of the ticks, not label, under MSW and so the
+        // label is on the opposite side
+        GtkPositionType posLabel;
+        if ( style & wxSL_VERTICAL )
         {
-            wxSize sz( size );
-            if (sz.x < 35)
-            {
-                sz.x = 35;
-                SetSize( sz );
-            }
+            if ( style & wxSL_LEFT )
+                posLabel = GTK_POS_RIGHT;
+            else // if ( style & wxSL_RIGHT ) -- this is also the default
+                posLabel = GTK_POS_LEFT;
         }
-        else
+        else // horizontal slider
         {
-            wxSize sz( size );
-            if (sz.y < 35)
-            {
-                sz.y = 35;
-                SetSize( sz );
-            }
+            if ( style & wxSL_TOP )
+                posLabel = GTK_POS_BOTTOM;
+            else // if ( style & wxSL_BOTTOM) -- this is again the default
+                posLabel = GTK_POS_TOP;
         }
+
+        gtk_scale_set_value_pos( GTK_SCALE(m_scale), posLabel );
     }
-    else
-        gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 
-    m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
+    // Keep full precision in position value
+    gtk_scale_set_digits(GTK_SCALE (m_scale), -1);
 
     if (style & wxSL_INVERSE)
-        gtk_range_set_inverted( GTK_RANGE(m_widget), TRUE );
-
-    GtkEnableEvents();
-    gtk_signal_connect( GTK_OBJECT(m_widget),
-                        "button_press_event",
-                        (GtkSignalFunc)gtk_slider_button_press_callback,
-                        (gpointer) this );
-    gtk_signal_connect( GTK_OBJECT(m_widget),
-                        "button_release_event",
-                        (GtkSignalFunc)gtk_slider_button_release_callback,
-                        (gpointer) this );
+        gtk_range_set_inverted( GTK_RANGE(m_scale), TRUE );
+
+    g_signal_connect(m_scale, "button_press_event", G_CALLBACK(gtk_button_press_event), this);
+    g_signal_connect(m_scale, "button_release_event", G_CALLBACK(gtk_button_release_event), this);
+    g_signal_connect(m_scale, "move_slider", G_CALLBACK(gtk_move_slider), this);
+    g_signal_connect(m_scale, "format_value", G_CALLBACK(gtk_format_value), NULL);
+    g_signal_connect(m_scale, "value_changed", G_CALLBACK(gtk_value_changed), this);
+    gulong handler_id = g_signal_connect(m_scale, "event_after", G_CALLBACK(gtk_event_after), this);
+    g_signal_handler_block(m_scale, handler_id);
 
     SetRange( minValue, maxValue );
-    SetValue( value );
+
+    // don't call the public SetValue() as it won't do anything unless the
+    // value really changed
+    GTKSetValue( value );
 
     m_parent->DoAddChild( this );
 
     PostCreation(size);
 
-    return TRUE;
+    return true;
 }
 
-int wxSlider::GetValue() const
+void wxSlider::GTKDisableEvents()
 {
-    return AdjustValueToInt(m_adjust->value);
+    m_blockScrollEvent = true;
 }
 
-void wxSlider::SetValue( int value )
+void wxSlider::GTKEnableEvents()
 {
-    double fpos = (double)value;
-    m_oldPos = fpos;
-    if ( AreSameAdjustValues(fpos, m_adjust->value) )
-        return;
+    m_blockScrollEvent = false;
+}
 
-    m_adjust->value = fpos;
+bool wxSlider::GTKEventsDisabled() const
+{
+   return m_blockScrollEvent;
+}
 
-    GtkDisableEvents();
+int wxSlider::GetValue() const
+{
+    return wxRound(m_pos);
+}
 
-    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
+void wxSlider::SetValue( int value )
+{
+    if (GetValue() != value)
+        GTKSetValue(value);
+}
 
-    GtkEnableEvents();
+void wxSlider::GTKSetValue(int value)
+{
+    GTKDisableEvents();
+    gtk_range_set_value(GTK_RANGE (m_scale), value);
+    // GTK only updates value label if handle moves at least 1 pixel
+    gtk_widget_queue_draw(m_scale);
+    GTKEnableEvents();
 }
 
 void wxSlider::SetRange( int minValue, int maxValue )
 {
-    double fmin = (double)minValue;
-    double fmax = (double)maxValue;
-
-    if ((fabs(fmin-m_adjust->lower) < 0.2) &&
-        (fabs(fmax-m_adjust->upper) < 0.2))
+    GTKDisableEvents();
+    if (minValue == maxValue)
+       maxValue++;
+    gtk_range_set_range(GTK_RANGE (m_scale), minValue, maxValue);
+    gtk_range_set_increments(GTK_RANGE (m_scale), 1, (maxValue - minValue + 9) / 10);
+    GTKEnableEvents();
+
+    if (HasFlag(wxSL_MIN_MAX_LABELS))
     {
-        return;
-    }
-
-    m_adjust->lower = fmin;
-    m_adjust->upper = fmax;
-    m_adjust->step_increment = 1.0;
-    m_adjust->page_increment = ceil((fmax-fmin) / 10.0);
+        wxString str;
 
-    GtkDisableEvents();
+        str.Printf( "%d", minValue );
+        if (HasFlag(wxSL_INVERSE))
+            gtk_label_set_text( GTK_LABEL(m_maxLabel), str.utf8_str() );
+        else
+            gtk_label_set_text( GTK_LABEL(m_minLabel), str.utf8_str() );
 
-    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
+        str.Printf( "%d", maxValue );
+        if (HasFlag(wxSL_INVERSE))
+            gtk_label_set_text( GTK_LABEL(m_minLabel), str.utf8_str() );
+        else
+            gtk_label_set_text( GTK_LABEL(m_maxLabel), str.utf8_str() );
 
-    GtkEnableEvents();
+    }
 }
 
 int wxSlider::GetMin() const
 {
-    return (int)ceil(m_adjust->lower);
+    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
+    return int(gtk_adjustment_get_lower(adj));
 }
 
 int wxSlider::GetMax() const
 {
-    return (int)ceil(m_adjust->upper);
+    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
+    return int(gtk_adjustment_get_upper(adj));
 }
 
 void wxSlider::SetPageSize( int pageSize )
 {
-    double fpage = (double)pageSize;
-
-    if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
-
-    m_adjust->page_increment = fpage;
-
-    GtkDisableEvents();
-
-    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
-
-    GtkEnableEvents();
+    GTKDisableEvents();
+    gtk_range_set_increments(GTK_RANGE (m_scale), GetLineSize(), pageSize);
+    GTKEnableEvents();
 }
 
 int wxSlider::GetPageSize() const
 {
-    return (int)ceil(m_adjust->page_increment);
+    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
+    return int(gtk_adjustment_get_page_increment(adj));
 }
 
-void wxSlider::SetThumbLength( int len )
+// GTK does not support changing the size of the slider
+void wxSlider::SetThumbLength(int)
 {
-    double flen = (double)len;
-
-    if (fabs(flen-m_adjust->page_size) < 0.2) return;
-
-    m_adjust->page_size = flen;
-
-    GtkDisableEvents();
-
-    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
-
-    GtkEnableEvents();
 }
 
 int wxSlider::GetThumbLength() const
-{
-    return (int)ceil(m_adjust->page_size);
-}
-
-void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
-{
-}
-
-int wxSlider::GetLineSize() const
 {
     return 0;
 }
 
-bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
+void wxSlider::SetLineSize( int lineSize )
 {
-    GtkRange *range = GTK_RANGE(m_widget);
-    return (range->event_window == window);
+    GTKDisableEvents();
+    gtk_range_set_increments(GTK_RANGE (m_scale), lineSize, GetPageSize());
+    GTKEnableEvents();
 }
 
-void wxSlider::GtkDisableEvents()
+int wxSlider::GetLineSize() const
 {
-    gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
-                        GTK_SIGNAL_FUNC(gtk_slider_callback),
-                        (gpointer) this );
+    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
+    return int(gtk_adjustment_get_step_increment(adj));
 }
 
-void wxSlider::GtkEnableEvents()
+GdkWindow *wxSlider::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
 {
-    gtk_signal_connect( GTK_OBJECT (m_adjust),
-                        "value_changed",
-                        GTK_SIGNAL_FUNC(gtk_slider_callback),
-                        (gpointer) this );
+    return GTK_RANGE(m_scale)->event_window;
 }
 
 // static
@@ -352,4 +532,4 @@ wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
     return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
 }
 
-#endif
+#endif // wxUSE_SLIDER