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wxWidgets/src/gtk/slider.cpp
iwbnwif a7fe78eda8 Implement wxSlider ticks support in wxGTK 
Tick marks were not available for wxSlider under GTK+ 2 or GTK+ 3
implementations of wxWidgets. However, tick marks have been available
for the GtkScale widget since GTK+ 2 version 2.16.

This change adds similar functionality in relation to tick marks
as was already available in wxMSW builds.

Closes https://github.com/wxWidgets/wxWidgets/pull/1355
2019-07-07 17:04:55 +02:00

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/////////////////////////////////////////////////////////////////////////////
// Name: src/gtk/slider.cpp
// Purpose:
// Author: Robert Roebling
// 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 "wx/gtk/private/wrapgtk.h"
#include "wx/gtk/private/eventsdisabler.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_SLIDER, 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 (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
wxGtkEventsDisabler<wxSlider> noEvents(win);
gtk_range_set_value(GTK_RANGE (win->m_scale), win->GetValue());
}
}
}
//-----------------------------------------------------------------------------
// "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()
{
Init();
}
wxSlider::~wxSlider()
{
if (m_scale && m_scale != m_widget)
GTKDisconnect(m_scale);
}
void wxSlider::Init()
{
m_scrollEventType = GTK_SCROLL_NONE;
m_needThumbRelease = false;
m_blockScrollEvent = false;
m_tickFreq = 0;
m_scale = NULL;
}
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)
{
Init();
m_pos = value;
if (!PreCreation( parent, pos, size ) ||
!CreateBase( parent, id, pos, size, style, validator, name ))
{
wxFAIL_MSG( wxT("wxSlider creation failed") );
return false;
}
const bool isVertical = (style & wxSL_VERTICAL) != 0;
m_scale = gtk_scale_new(GtkOrientation(isVertical), NULL);
if (style & wxSL_MIN_MAX_LABELS)
{
gtk_widget_show( m_scale );
m_widget = gtk_box_new(GtkOrientation(!isVertical), 0);
gtk_box_pack_start(GTK_BOX(m_widget), m_scale, true, true, 0);
GtkWidget* box = gtk_box_new(GtkOrientation(isVertical), 0);
gtk_widget_show(box);
gtk_box_pack_start(GTK_BOX(m_widget), box, true, true, 0);
m_minLabel = gtk_label_new(NULL);
gtk_widget_show( m_minLabel );
gtk_box_pack_start(GTK_BOX(box), m_minLabel, false, false, 0);
// expanding empty space between the min/max labels
GtkWidget *space = gtk_label_new(NULL);
gtk_widget_show( space );
gtk_box_pack_start(GTK_BOX(box), space, true, false, 0);
m_maxLabel = gtk_label_new(NULL);
gtk_widget_show( m_maxLabel );
gtk_box_pack_end(GTK_BOX(box), m_maxLabel, false, false, 0);
}
else
{
m_widget = m_scale;
m_maxLabel = NULL;
m_minLabel = NULL;
}
g_object_ref(m_widget);
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, 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)
{
wxGtkEventsDisabler<wxSlider> noEvents(this);
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);
}
void wxSlider::SetRange( int minValue, int maxValue )
{
wxGtkEventsDisabler<wxSlider> noEvents(this);
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);
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 )
{
wxGtkEventsDisabler<wxSlider> noEvents(this);
gtk_range_set_increments(GTK_RANGE (m_scale), GetLineSize(), pageSize);
}
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 )
{
wxGtkEventsDisabler<wxSlider> noEvents(this);
gtk_range_set_increments(GTK_RANGE (m_scale), lineSize, GetPageSize());
}
int wxSlider::GetLineSize() const
{
GtkAdjustment* adj = gtk_range_get_adjustment(GTK_RANGE(m_scale));
return int(gtk_adjustment_get_step_increment(adj));
}
void wxSlider::ClearTicks()
{
#if GTK_CHECK_VERSION(2,16,0)
if (wx_is_at_least_gtk2(16))
gtk_scale_clear_marks(GTK_SCALE (m_scale));
#endif
}
void wxSlider::SetTick(int tickPos)
{
#if GTK_CHECK_VERSION(2,16,0)
if ( wx_is_at_least_gtk2(16) )
{
GtkPositionType posTicks;
long style = GetWindowStyle();
if ( style & wxSL_VERTICAL )
{
if ( style & wxSL_LEFT )
posTicks = GTK_POS_LEFT;
else
posTicks = GTK_POS_RIGHT;
}
else // horizontal slider
{
if ( style & wxSL_TOP )
posTicks = GTK_POS_TOP;
else
posTicks = GTK_POS_BOTTOM;
}
gtk_scale_add_mark(GTK_SCALE (m_scale), (double)tickPos, posTicks, NULL);
}
#else
wxUnusedVar(tickPos);
#endif
}
void wxSlider::DoSetTickFreq(int freq)
{
#if GTK_CHECK_VERSION(2,16,0)
if ( wx_is_at_least_gtk2(16) )
{
m_tickFreq = freq;
gtk_scale_clear_marks(GTK_SCALE (m_scale));
for (int i = GetMin() + freq; i < GetMax(); i += freq)
SetTick(i);
}
#else
wxUnusedVar(freq);
#endif
}
int wxSlider::GetTickFreq() const
{
#if GTK_CHECK_VERSION(2,16,0)
return wx_is_at_least_gtk2(16) ? m_tickFreq : -1;
#else
return -1;
#endif
}
GdkWindow *wxSlider::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
{
#ifdef __WXGTK3__
return GTKFindWindow(m_scale);
#else
return GTK_RANGE(m_scale)->event_window;
#endif
}
// static
wxVisualAttributes
wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
{
return GetDefaultAttributesFromGTKWidget(gtk_scale_new(GTK_ORIENTATION_VERTICAL, NULL));
}
#endif // wxUSE_SLIDER
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