src/gtk/slider.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk/slider.cpp
// Purpose:
// Author:      Robert Roebling
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#if wxUSE_SLIDER

#include "wx/slider.h"

#ifndef WX_PRECOMP
    #include "wx/utils.h"
    #include "wx/math.h"
#endif

#include <gtk/gtk.h>
#include "wx/gtk/private/gtk2-compat.h"

//-----------------------------------------------------------------------------
// data
//-----------------------------------------------------------------------------

extern bool g_blockEventsOnDrag;

// ----------------------------------------------------------------------------
// helper functions
// ----------------------------------------------------------------------------

// process a scroll event
static void
ProcessScrollEvent(wxSlider *win, wxEventType evtType)
{
    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 wxEventType GtkScrollTypeToWx(int scrollType)
{
    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;
}

// 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
gtk_value_changed(GtkRange* range, wxSlider* win)
{
    const double value = gtk_range_get_value(range);
    const double oldPos = win->m_pos;
    win->m_pos = value;

    if (!win->m_hasVMT || g_blockEventsOnDrag)
        return;

    if (win->GTKEventsDisabled())
    {
        win->m_scrollEventType = GTK_SCROLL_NONE;
        return;
    }

    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;
    }
}
}

//-----------------------------------------------------------------------------
// "move_slider" (keyboard event)
//-----------------------------------------------------------------------------

extern "C" {
static void
gtk_move_slider(GtkRange*, GtkScrollType scrollType, wxSlider* win)
{
    // Save keyboard scroll type for "value_changed" handler
    win->m_scrollEventType = scrollType;
}
}

//-----------------------------------------------------------------------------
// "button_press_event"
//-----------------------------------------------------------------------------

extern "C" {
static gboolean
gtk_button_press_event(GtkWidget*, GdkEventButton*, wxSlider* win)
{
    win->m_mouseButtonDown = true;

    return false;
}
}

//-----------------------------------------------------------------------------
// "event_after"
//-----------------------------------------------------------------------------

extern "C" {
static void
gtk_event_after(GtkRange* range, GdkEvent* event, wxSlider* win)
{
    if (event->type == GDK_BUTTON_RELEASE)
    {
        g_signal_handlers_block_by_func(range, (gpointer) gtk_event_after, win);

        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"
//-----------------------------------------------------------------------------

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
//-----------------------------------------------------------------------------

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)
{
    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;
    }


    if (style & wxSL_VERTICAL)
        m_scale = gtk_vscale_new( NULL );
    else
        m_scale = gtk_hscale_new( NULL );
    g_object_ref(m_scale);

    if (style & wxSL_MIN_MAX_LABELS)
    {
        gtk_widget_show( m_scale );

        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 )
        {
            if ( style & wxSL_LEFT )
                posLabel = GTK_POS_RIGHT;
            else // if ( style & wxSL_RIGHT ) -- this is also the default
                posLabel = GTK_POS_LEFT;
        }
        else // horizontal slider
        {
            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 );
    }

    // 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_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 );

    // 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;
}

void wxSlider::GTKDisableEvents()
{
    m_blockScrollEvent = true;
}

void wxSlider::GTKEnableEvents()
{
    m_blockScrollEvent = false;
}

bool wxSlider::GTKEventsDisabled() const
{
   return m_blockScrollEvent;
}

int wxSlider::GetValue() const
{
    return wxRound(m_pos);
}

void wxSlider::SetValue( int value )
{
    if (GetValue() != value)
        GTKSetValue(value);
}

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 )
{
    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))
    {
        wxString str;

        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() );

        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() );

    }
}

int wxSlider::GetMin() const
{
    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
    return int(gtk_adjustment_get_lower(adj));
}

int wxSlider::GetMax() const
{
    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
    return int(gtk_adjustment_get_upper(adj));
}

void wxSlider::SetPageSize( int pageSize )
{
    GTKDisableEvents();
    gtk_range_set_increments(GTK_RANGE (m_scale), GetLineSize(), pageSize);
    GTKEnableEvents();
}

int wxSlider::GetPageSize() const
{
    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
    return int(gtk_adjustment_get_page_increment(adj));
}

// GTK does not support changing the size of the slider
void wxSlider::SetThumbLength(int)
{
}

int wxSlider::GetThumbLength() const
{
    return 0;
}

void wxSlider::SetLineSize( int lineSize )
{
    GTKDisableEvents();
    gtk_range_set_increments(GTK_RANGE (m_scale), lineSize, GetPageSize());
    GTKEnableEvents();
}

int wxSlider::GetLineSize() const
{
    GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
    return int(gtk_adjustment_get_step_increment(adj));
}

GdkWindow *wxSlider::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
{
    return GTK_RANGE(m_scale)->event_window;
}

// static
wxVisualAttributes
wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
{
    return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
}

#endif // wxUSE_SLIDER
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: src/gtk/slider.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_SLIDER
	14
	15	#include "wx/slider.h"
	16
	17	#ifndef WX_PRECOMP
	18	#include "wx/utils.h"
	19	#include "wx/math.h"
	20	#endif
	21
	22	#include <gtk/gtk.h>
	23	#include "wx/gtk/private/gtk2-compat.h"
	24
	25	//-----------------------------------------------------------------------------
	26	// data
	27	//-----------------------------------------------------------------------------
	28
	29	extern bool g_blockEventsOnDrag;
	30
	31	// ----------------------------------------------------------------------------
	32	// helper functions
	33	// ----------------------------------------------------------------------------
	34
	35	// process a scroll event
	36	static void
	37	ProcessScrollEvent(wxSlider *win, wxEventType evtType)
	38	{
	39	const int orient = win->HasFlag(wxSL_VERTICAL) ? wxVERTICAL
	40	: wxHORIZONTAL;
	41
	42	const int value = win->GetValue();
	43
	44	// if we have any "special" event (i.e. the value changed by a line or a
	45	// page), send this specific event first
	46	if ( evtType != wxEVT_NULL )
	47	{
	48	wxScrollEvent event( evtType, win->GetId(), value, orient );
	49	event.SetEventObject( win );
	50	win->HandleWindowEvent( event );
	51	}
	52
	53	// but, in any case, except if we're dragging the slider (and so the change
	54	// is not definitive), send a generic "changed" event
	55	if ( evtType != wxEVT_SCROLL_THUMBTRACK )
	56	{
	57	wxScrollEvent event(wxEVT_SCROLL_CHANGED, win->GetId(), value, orient);
	58	event.SetEventObject( win );
	59	win->HandleWindowEvent( event );
	60	}
	61
	62	// and also generate a command event for compatibility
	63	wxCommandEvent event( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
	64	event.SetEventObject( win );
	65	event.SetInt( value );
	66	win->HandleWindowEvent( event );
	67	}
	68
	69	static inline wxEventType GtkScrollTypeToWx(int scrollType)
	70	{
	71	wxEventType eventType;
	72	switch (scrollType)
	73	{
	74	case GTK_SCROLL_STEP_BACKWARD:
	75	case GTK_SCROLL_STEP_LEFT:
	76	case GTK_SCROLL_STEP_UP:
	77	eventType = wxEVT_SCROLL_LINEUP;
	78	break;
	79	case GTK_SCROLL_STEP_DOWN:
	80	case GTK_SCROLL_STEP_FORWARD:
	81	case GTK_SCROLL_STEP_RIGHT:
	82	eventType = wxEVT_SCROLL_LINEDOWN;
	83	break;
	84	case GTK_SCROLL_PAGE_BACKWARD:
	85	case GTK_SCROLL_PAGE_LEFT:
	86	case GTK_SCROLL_PAGE_UP:
	87	eventType = wxEVT_SCROLL_PAGEUP;
	88	break;
	89	case GTK_SCROLL_PAGE_DOWN:
	90	case GTK_SCROLL_PAGE_FORWARD:
	91	case GTK_SCROLL_PAGE_RIGHT:
	92	eventType = wxEVT_SCROLL_PAGEDOWN;
	93	break;
	94	case GTK_SCROLL_START:
	95	eventType = wxEVT_SCROLL_TOP;
	96	break;
	97	case GTK_SCROLL_END:
	98	eventType = wxEVT_SCROLL_BOTTOM;
	99	break;
	100	case GTK_SCROLL_JUMP:
	101	eventType = wxEVT_SCROLL_THUMBTRACK;
	102	break;
	103	default:
	104	wxFAIL_MSG(wxT("Unknown GtkScrollType"));
	105	eventType = wxEVT_NULL;
	106	break;
	107	}
	108	return eventType;
	109	}
	110
	111	// Determine if increment is the same as +/-x, allowing for some small
	112	// difference due to possible inexactness in floating point arithmetic
	113	static inline bool IsScrollIncrement(double increment, double x)
	114	{
	115	wxASSERT(increment > 0);
	116	const double tolerance = 1.0 / 1024;
	117	return fabs(increment - fabs(x)) < tolerance;
	118	}
	119
	120	//-----------------------------------------------------------------------------
	121	// "value_changed"
	122	//-----------------------------------------------------------------------------
	123
	124	extern "C" {
	125	static void
	126	gtk_value_changed(GtkRange* range, wxSlider* win)
	127	{
	128	const double value = gtk_range_get_value(range);
	129	const double oldPos = win->m_pos;
	130	win->m_pos = value;
	131
	132	if (!win->m_hasVMT \|\| g_blockEventsOnDrag)
	133	return;
	134
	135	if (win->GTKEventsDisabled())
	136	{
	137	win->m_scrollEventType = GTK_SCROLL_NONE;
	138	return;
	139	}
	140
	141	wxEventType eventType = wxEVT_NULL;
	142	if (win->m_isScrolling)
	143	{
	144	eventType = wxEVT_SCROLL_THUMBTRACK;
	145	}
	146	else if (win->m_scrollEventType != GTK_SCROLL_NONE)
	147	{
	148	// Scroll event from "move-slider" (keyboard)
	149	eventType = GtkScrollTypeToWx(win->m_scrollEventType);
	150	}
	151	else if (win->m_mouseButtonDown)
	152	{
	153	// Difference from last change event
	154	const double diff = value - oldPos;
	155	const bool isDown = diff > 0;
	156
	157	GtkAdjustment* adj = gtk_range_get_adjustment(range);
	158	if (IsScrollIncrement(gtk_adjustment_get_page_increment(adj), diff))
	159	{
	160	eventType = isDown ? wxEVT_SCROLL_PAGEDOWN : wxEVT_SCROLL_PAGEUP;
	161	}
	162	else if (wxIsSameDouble(value, 0))
	163	{
	164	eventType = wxEVT_SCROLL_PAGEUP;
	165	}
	166	else if (wxIsSameDouble(value, gtk_adjustment_get_upper(adj)))
	167	{
	168	eventType = wxEVT_SCROLL_PAGEDOWN;
	169	}
	170	else
	171	{
	172	// Assume track event
	173	eventType = wxEVT_SCROLL_THUMBTRACK;
	174	// Remember that we're tracking
	175	win->m_isScrolling = true;
	176	}
	177	}
	178
	179	win->m_scrollEventType = GTK_SCROLL_NONE;
	180
	181	// If integral position has changed
	182	if (wxRound(oldPos) != wxRound(value))
	183	{
	184	ProcessScrollEvent(win, eventType);
	185	win->m_needThumbRelease = eventType == wxEVT_SCROLL_THUMBTRACK;
	186	}
	187	}
	188	}
	189
	190	//-----------------------------------------------------------------------------
	191	// "move_slider" (keyboard event)
	192	//-----------------------------------------------------------------------------
	193
	194	extern "C" {
	195	static void
	196	gtk_move_slider(GtkRange, GtkScrollType scrollType, wxSlider win)
	197	{
	198	// Save keyboard scroll type for "value_changed" handler
	199	win->m_scrollEventType = scrollType;
	200	}
	201	}
	202
	203	//-----------------------------------------------------------------------------
	204	// "button_press_event"
	205	//-----------------------------------------------------------------------------
	206
	207	extern "C" {
	208	static gboolean
	209	gtk_button_press_event(GtkWidget, GdkEventButton, wxSlider* win)
	210	{
	211	win->m_mouseButtonDown = true;
	212
	213	return false;
	214	}
	215	}
	216
	217	//-----------------------------------------------------------------------------
	218	// "event_after"
	219	//-----------------------------------------------------------------------------
	220
	221	extern "C" {
	222	static void
	223	gtk_event_after(GtkRange* range, GdkEvent* event, wxSlider* win)
	224	{
	225	if (event->type == GDK_BUTTON_RELEASE)
	226	{
	227	g_signal_handlers_block_by_func(range, (gpointer) gtk_event_after, win);
	228
	229	if (win->m_needThumbRelease)
	230	{
	231	win->m_needThumbRelease = false;
	232	ProcessScrollEvent(win, wxEVT_SCROLL_THUMBRELEASE);
	233	}
	234	// Keep slider at an integral position
	235	win->GTKDisableEvents();
	236	gtk_range_set_value(GTK_RANGE (win->m_scale), win->GetValue());
	237	win->GTKEnableEvents();
	238	}
	239	}
	240	}
	241
	242	//-----------------------------------------------------------------------------
	243	// "button_release_event"
	244	//-----------------------------------------------------------------------------
	245
	246	extern "C" {
	247	static gboolean
	248	gtk_button_release_event(GtkRange* range, GdkEventButton, wxSlider win)
	249	{
	250	win->m_mouseButtonDown = false;
	251	if (win->m_isScrolling)
	252	{
	253	win->m_isScrolling = false;
	254	g_signal_handlers_unblock_by_func(range, (gpointer) gtk_event_after, win);
	255	}
	256	return false;
	257	}
	258	}
	259
	260	//-----------------------------------------------------------------------------
	261	// "format_value"
	262	//-----------------------------------------------------------------------------
	263
	264	extern "C" {
	265	static gchar* gtk_format_value(GtkScale, double value, void)
	266	{
	267	// Format value as nearest integer
	268	return g_strdup_printf("%d", wxRound(value));
	269	}
	270	}
	271
	272	//-----------------------------------------------------------------------------
	273	// wxSlider
	274	//-----------------------------------------------------------------------------
	275
	276	wxSlider::wxSlider()
	277	{
	278	m_pos = 0;
	279	m_scrollEventType = GTK_SCROLL_NONE;
	280	m_needThumbRelease = false;
	281	m_blockScrollEvent = false;
	282	}
	283
	284	bool wxSlider::Create(wxWindow *parent,
	285	wxWindowID id,
	286	int value,
	287	int minValue,
	288	int maxValue,
	289	const wxPoint& pos,
	290	const wxSize& size,
	291	long style,
	292	const wxValidator& validator,
	293	const wxString& name)
	294	{
	295	m_pos = value;
	296	m_scrollEventType = GTK_SCROLL_NONE;
	297
	298	if (!PreCreation( parent, pos, size ) \|\|
	299	!CreateBase( parent, id, pos, size, style, validator, name ))
	300	{
	301	wxFAIL_MSG( wxT("wxSlider creation failed") );
	302	return false;
	303	}
	304
	305
	306	if (style & wxSL_VERTICAL)
	307	m_scale = gtk_vscale_new( NULL );
	308	else
	309	m_scale = gtk_hscale_new( NULL );
	310	g_object_ref(m_scale);
	311
	312	if (style & wxSL_MIN_MAX_LABELS)
	313	{
	314	gtk_widget_show( m_scale );
	315
	316	if (style & wxSL_VERTICAL)
	317	m_widget = gtk_hbox_new(false, 0);
	318	else
	319	m_widget = gtk_vbox_new(false, 0);
	320	g_object_ref(m_widget);
	321	gtk_widget_show( m_widget );
	322	gtk_container_add( GTK_CONTAINER(m_widget), m_scale );
	323
	324	GtkWidget *box;
	325	if (style & wxSL_VERTICAL)
	326	box = gtk_vbox_new(false,0);
	327	else
	328	box = gtk_hbox_new(false,0);
	329	g_object_ref(box);
	330	gtk_widget_show(box);
	331	gtk_container_add( GTK_CONTAINER(m_widget), box );
	332
	333	m_minLabel = gtk_label_new(NULL);
	334	g_object_ref(m_minLabel);
	335	gtk_widget_show( m_minLabel );
	336	gtk_container_add( GTK_CONTAINER(box), m_minLabel );
	337	gtk_box_set_child_packing( GTK_BOX(box), m_minLabel, FALSE, FALSE, 0, GTK_PACK_START );
	338
	339	// expanding empty space between the min/max labels
	340	GtkWidget *space = gtk_label_new(NULL);
	341	g_object_ref(space);
	342	gtk_widget_show( space );
	343	gtk_container_add( GTK_CONTAINER(box), space );
	344	gtk_box_set_child_packing( GTK_BOX(box), space, TRUE, FALSE, 0, GTK_PACK_START );
	345
	346	m_maxLabel = gtk_label_new(NULL);
	347	g_object_ref(m_maxLabel);
	348	gtk_widget_show( m_maxLabel );
	349	gtk_container_add( GTK_CONTAINER(box), m_maxLabel );
	350	gtk_box_set_child_packing( GTK_BOX(box), m_maxLabel, FALSE, FALSE, 0, GTK_PACK_END );
	351	}
	352	else
	353	{
	354	m_widget = m_scale;
	355	m_maxLabel = NULL;
	356	m_minLabel = NULL;
	357	}
	358
	359	const bool showValueLabel = (style & wxSL_VALUE_LABEL) != 0;
	360	gtk_scale_set_draw_value(GTK_SCALE (m_scale), showValueLabel );
	361	if ( showValueLabel )
	362	{
	363	// position the label appropriately: notice that wxSL_DIRECTION flags
	364	// specify the position of the ticks, not label, under MSW and so the
	365	// label is on the opposite side
	366	GtkPositionType posLabel;
	367	if ( style & wxSL_VERTICAL )
	368	{
	369	if ( style & wxSL_LEFT )
	370	posLabel = GTK_POS_RIGHT;
	371	else // if ( style & wxSL_RIGHT ) -- this is also the default
	372	posLabel = GTK_POS_LEFT;
	373	}
	374	else // horizontal slider
	375	{
	376	if ( style & wxSL_TOP )
	377	posLabel = GTK_POS_BOTTOM;
	378	else // if ( style & wxSL_BOTTOM) -- this is again the default
	379	posLabel = GTK_POS_TOP;
	380	}
	381
	382	gtk_scale_set_value_pos( GTK_SCALE(m_scale), posLabel );
	383	}
	384
	385	// Keep full precision in position value
	386	gtk_scale_set_digits(GTK_SCALE (m_scale), -1);
	387
	388	if (style & wxSL_INVERSE)
	389	gtk_range_set_inverted( GTK_RANGE(m_scale), TRUE );
	390
	391	g_signal_connect(m_scale, "button_press_event", G_CALLBACK(gtk_button_press_event), this);
	392	g_signal_connect(m_scale, "button_release_event", G_CALLBACK(gtk_button_release_event), this);
	393	g_signal_connect(m_scale, "move_slider", G_CALLBACK(gtk_move_slider), this);
	394	g_signal_connect(m_scale, "format_value", G_CALLBACK(gtk_format_value), NULL);
	395	g_signal_connect(m_scale, "value_changed", G_CALLBACK(gtk_value_changed), this);
	396	gulong handler_id = g_signal_connect(m_scale, "event_after", G_CALLBACK(gtk_event_after), this);
	397	g_signal_handler_block(m_scale, handler_id);
	398
	399	SetRange( minValue, maxValue );
	400
	401	// don't call the public SetValue() as it won't do anything unless the
	402	// value really changed
	403	GTKSetValue( value );
	404
	405	m_parent->DoAddChild( this );
	406
	407	PostCreation(size);
	408
	409	return true;
	410	}
	411
	412	void wxSlider::GTKDisableEvents()
	413	{
	414	m_blockScrollEvent = true;
	415	}
	416
	417	void wxSlider::GTKEnableEvents()
	418	{
	419	m_blockScrollEvent = false;
	420	}
	421
	422	bool wxSlider::GTKEventsDisabled() const
	423	{
	424	return m_blockScrollEvent;
	425	}
	426
	427	int wxSlider::GetValue() const
	428	{
	429	return wxRound(m_pos);
	430	}
	431
	432	void wxSlider::SetValue( int value )
	433	{
	434	if (GetValue() != value)
	435	GTKSetValue(value);
	436	}
	437
	438	void wxSlider::GTKSetValue(int value)
	439	{
	440	GTKDisableEvents();
	441	gtk_range_set_value(GTK_RANGE (m_scale), value);
	442	// GTK only updates value label if handle moves at least 1 pixel
	443	gtk_widget_queue_draw(m_scale);
	444	GTKEnableEvents();
	445	}
	446
	447	void wxSlider::SetRange( int minValue, int maxValue )
	448	{
	449	GTKDisableEvents();
	450	if (minValue == maxValue)
	451	maxValue++;
	452	gtk_range_set_range(GTK_RANGE (m_scale), minValue, maxValue);
	453	gtk_range_set_increments(GTK_RANGE (m_scale), 1, (maxValue - minValue + 9) / 10);
	454	GTKEnableEvents();
	455
	456	if (HasFlag(wxSL_MIN_MAX_LABELS))
	457	{
	458	wxString str;
	459
	460	str.Printf( "%d", minValue );
	461	if (HasFlag(wxSL_INVERSE))
	462	gtk_label_set_text( GTK_LABEL(m_maxLabel), str.utf8_str() );
	463	else
	464	gtk_label_set_text( GTK_LABEL(m_minLabel), str.utf8_str() );
	465
	466	str.Printf( "%d", maxValue );
	467	if (HasFlag(wxSL_INVERSE))
	468	gtk_label_set_text( GTK_LABEL(m_minLabel), str.utf8_str() );
	469	else
	470	gtk_label_set_text( GTK_LABEL(m_maxLabel), str.utf8_str() );
	471
	472	}
	473	}
	474
	475	int wxSlider::GetMin() const
	476	{
	477	GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
	478	return int(gtk_adjustment_get_lower(adj));
	479	}
	480
	481	int wxSlider::GetMax() const
	482	{
	483	GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
	484	return int(gtk_adjustment_get_upper(adj));
	485	}
	486
	487	void wxSlider::SetPageSize( int pageSize )
	488	{
	489	GTKDisableEvents();
	490	gtk_range_set_increments(GTK_RANGE (m_scale), GetLineSize(), pageSize);
	491	GTKEnableEvents();
	492	}
	493
	494	int wxSlider::GetPageSize() const
	495	{
	496	GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
	497	return int(gtk_adjustment_get_page_increment(adj));
	498	}
	499
	500	// GTK does not support changing the size of the slider
	501	void wxSlider::SetThumbLength(int)
	502	{
	503	}
	504
	505	int wxSlider::GetThumbLength() const
	506	{
	507	return 0;
	508	}
	509
	510	void wxSlider::SetLineSize( int lineSize )
	511	{
	512	GTKDisableEvents();
	513	gtk_range_set_increments(GTK_RANGE (m_scale), lineSize, GetPageSize());
	514	GTKEnableEvents();
	515	}
	516
	517	int wxSlider::GetLineSize() const
	518	{
	519	GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
	520	return int(gtk_adjustment_get_step_increment(adj));
	521	}
	522
	523	GdkWindow *wxSlider::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
	524	{
	525	return GTK_RANGE(m_scale)->event_window;
	526	}
	527
	528	// static
	529	wxVisualAttributes
	530	wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
	531	{
	532	return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
	533	}
	534
	535	#endif // wxUSE_SLIDER