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wxwidgets/src/gtk/slider.cpp
Paul Cornett 12a480c12d gtk slider code simplification and better event determination 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39233 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2006-05-19 16:57:37 +00:00

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/////////////////////////////////////////////////////////////////////////////
// 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"
#endif
#include "wx/gtk/private.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->GetEventHandler()->ProcessEvent( 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->GetEventHandler()->ProcessEvent( event );
}
// and also generate a command event for compatibility
wxCommandEvent event( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
event.SetEventObject( win );
event.SetInt( value );
win->GetEventHandler()->ProcessEvent( 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(_T("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)
{
if (g_isIdle) wxapp_install_idle_handler();
if (!win->m_hasVMT) return;
if (g_blockEventsOnDrag) return;
GtkAdjustment* adj = range->adjustment;
const int pos = int(round(adj->value));
const double oldPos = win->m_pos;
win->m_pos = adj->value;
if (win->m_blockScrollEvent)
{
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 = adj->value - oldPos;
const bool isDown = diff > 0;
if (IsScrollIncrement(adj->page_increment, diff))
{
eventType = isDown ? wxEVT_SCROLL_PAGEDOWN : wxEVT_SCROLL_PAGEUP;
}
else if (wxIsSameDouble(adj->value, 0))
{
eventType = wxEVT_SCROLL_PAGEUP;
}
else if (wxIsSameDouble(adj->value, adj->upper))
{
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 (int(round(oldPos)) != pos)
{
wxCHECK_RET(eventType != wxEVT_NULL, _T("Unknown slider scroll event type"));
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;
}
}
// Single shot idle callback, to generate thumb release event, and
// truncate position to integral value. Idle callback is used
// because position cannot be changed from button release event.
extern "C" {
static gboolean
idle_thumbrelease(void* data)
{
wxSlider* win = (wxSlider*)data;
win->m_isScrolling = false;
if (win->m_needThumbRelease)
{
win->m_needThumbRelease = false;
ProcessScrollEvent(win, wxEVT_SCROLL_THUMBRELEASE);
}
// Keep slider at an integral position
win->BlockScrollEvent();
gtk_range_set_value((GtkRange*)win->m_widget, win->GetValue());
win->UnblockScrollEvent();
return false;
}
}
//-----------------------------------------------------------------------------
// "button_release_event"
//-----------------------------------------------------------------------------
extern "C" {
static gboolean
gtk_button_release_event(GtkWidget*, GdkEventButton*, wxSlider* win)
{
win->m_mouseButtonDown = false;
if (win->m_isScrolling)
{
g_idle_add(idle_thumbrelease, 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", int(round(value)));
}
}
//-----------------------------------------------------------------------------
// wxSlider
//-----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
wxSlider::wxSlider()
{
m_pos = 0;
m_scrollEventType = 0;
m_needThumbRelease = 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_acceptsFocus = true;
m_needParent = true;
if (!PreCreation( parent, pos, size ) ||
!CreateBase( parent, id, pos, size, style, validator, name ))
{
wxFAIL_MSG( wxT("wxSlider creation failed") );
return false;
}
m_pos = 0;
m_scrollEventType = 0;
m_needThumbRelease = false;
if (style & wxSL_VERTICAL)
m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
else
m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
gtk_scale_set_draw_value((GtkScale*)m_widget, (style & wxSL_LABELS) != 0);
// Keep full precision in position value
gtk_scale_set_digits((GtkScale*)m_widget, -1);
if (style & wxSL_INVERSE)
gtk_range_set_inverted( GTK_RANGE(m_widget), TRUE );
g_signal_connect(m_widget, "button_press_event", G_CALLBACK(gtk_button_press_event), this);
g_signal_connect(m_widget, "button_release_event", G_CALLBACK(gtk_button_release_event), this);
g_signal_connect(m_widget, "move_slider", G_CALLBACK(gtk_move_slider), this);
g_signal_connect(m_widget, "format_value", G_CALLBACK(gtk_format_value), NULL);
g_signal_connect(m_widget, "value_changed", G_CALLBACK(gtk_value_changed), this);
SetRange( minValue, maxValue );
SetValue( value );
m_parent->DoAddChild( this );
PostCreation(size);
return true;
}
int wxSlider::GetValue() const
{
return int(round(m_pos));
}
void wxSlider::SetValue( int value )
{
if (GetValue() != value)
{
BlockScrollEvent();
gtk_range_set_value((GtkRange*)m_widget, value);
UnblockScrollEvent();
}
}
void wxSlider::SetRange( int minValue, int maxValue )
{
BlockScrollEvent();
gtk_range_set_range((GtkRange*)m_widget, minValue, maxValue);
gtk_range_set_increments((GtkRange*)m_widget, 1, (maxValue - minValue + 9) / 10);
UnblockScrollEvent();
}
int wxSlider::GetMin() const
{
return int(((GtkRange*)m_widget)->adjustment->lower);
}
int wxSlider::GetMax() const
{
return int(((GtkRange*)m_widget)->adjustment->upper);
}
void wxSlider::SetPageSize( int pageSize )
{
BlockScrollEvent();
gtk_range_set_increments((GtkRange*)m_widget, 1, pageSize);
UnblockScrollEvent();
}
int wxSlider::GetPageSize() const
{
return int(((GtkRange*)m_widget)->adjustment->page_increment);
}
// GTK does not support changing the size of the slider
void wxSlider::SetThumbLength(int)
{
}
int wxSlider::GetThumbLength() const
{
return 0;
}
void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
{
}
int wxSlider::GetLineSize() const
{
return 0;
}
bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
{
GtkRange *range = GTK_RANGE(m_widget);
return (range->event_window == window);
}
// static
wxVisualAttributes
wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
{
return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
}
#endif // wxUSE_SLIDER
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