wxWidgets/src/gtk/slider.cpp

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

#ifdef __GNUG__
#pragma implementation "slider.h"
#endif

#include "wx/slider.h"
#include "wx/utils.h"
#include <math.h>

#include "gdk/gdk.h"
#include "gtk/gtk.h"

//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------

extern void wxapp_install_idle_handler();
extern bool g_isIdle;

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

extern bool   g_blockEventsOnDrag;

//-----------------------------------------------------------------------------
// "value_changed"
//-----------------------------------------------------------------------------

static void gtk_slider_callback( GtkWidget *WXUNUSED(widget), wxSlider *win )
{ 
    if (g_isIdle) wxapp_install_idle_handler();

    if (!win->HasVMT()) return;
    if (g_blockEventsOnDrag) return;
    
    float diff = win->m_adjust->value - win->m_oldPos;
    if (fabs(diff) < 0.2) return;
    win->m_oldPos = win->m_adjust->value;
  
    wxEventType command = wxEVT_NULL;
  
    float line_step = win->m_adjust->step_increment;
    float page_step = win->m_adjust->page_increment;
  
    if (fabs(win->m_adjust->value-win->m_adjust->lower) < 0.2) command = wxEVT_SCROLL_BOTTOM;
    else if (fabs(win->m_adjust->value-win->m_adjust->upper) < 0.2) command = wxEVT_SCROLL_TOP;
    else if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
    else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
    else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
    else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
    else command = wxEVT_SCROLL_THUMBTRACK;

    int value = (int)ceil(win->m_adjust->value);
      
    int orient = wxHORIZONTAL;
    if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) orient = wxVERTICAL;
  
    wxScrollEvent event( command, win->GetId(), value, orient );
    event.SetEventObject( win );
    win->GetEventHandler()->ProcessEvent( event );
  
    wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
    cevent.SetEventObject( win );
    win->GetEventHandler()->ProcessEvent( cevent );
}

//-----------------------------------------------------------------------------
// wxSlider
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)

wxSlider::wxSlider(void)
{
}

wxSlider::~wxSlider(void)
{
}

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;
  
    PreCreation( parent, id, pos, size, style, name );
  
    SetValidator( validator );

    m_oldPos = 0.0;

    if (style & wxSL_VERTICAL)
        m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
    else
        m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
    
    if (style & wxSL_LABELS)
    {
        gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
	
	/* labels need more space and too small window will
	   cause junk to appear on the dialog */
        if (style & wxSL_VERTICAL)
	{
	    wxSize sz( size );
	    if (sz.x < 35)
	    {
	        sz.x = 35;
		SetSize( sz );
	    }
	}
        else
	{
	    wxSize sz( size );
	    if (sz.y < 35)
	    {
	        sz.y = 35;
		SetSize( sz );
	    }
	}
    }
    else
        gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );

    m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
  
    gtk_signal_connect( GTK_OBJECT(m_adjust), 
                        "value_changed",
		        (GtkSignalFunc) gtk_slider_callback, 
			(gpointer) this );
	
    SetRange( minValue, maxValue );
    SetValue( value );
  
    m_parent->AddChild( this );

    (m_parent->m_insertCallback)( m_parent, this );
  
    PostCreation();
  
    SetBackgroundColour( parent->GetBackgroundColour() );

    Show( TRUE );
    
    return TRUE;
}

int wxSlider::GetValue(void) const
{
    return (int)(m_adjust->value+0.5);
}

void wxSlider::SetValue( int value )
{
    float fpos = (float)value;
    m_oldPos = fpos;
    if (fabs(fpos-m_adjust->value) < 0.2) return;
    
    m_adjust->value = fpos;
  
    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
}

void wxSlider::SetRange( int minValue, int maxValue )
{
    float fmin = (float)minValue;
    float fmax = (float)maxValue;
      
    if ((fabs(fmin-m_adjust->lower) < 0.2) &&
        (fabs(fmax-m_adjust->upper) < 0.2))
    {
        return;
    }
      
    m_adjust->lower = fmin;
    m_adjust->upper = fmax;

    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
}

int wxSlider::GetMin(void) const
{
    return (int)ceil(m_adjust->lower);
}

int wxSlider::GetMax(void) const
{
    return (int)ceil(m_adjust->upper);
}

void wxSlider::SetPageSize( int pageSize )
{
    float fpage = (float)pageSize;
      
    if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
      
    m_adjust->page_increment = fpage;

    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
}

int wxSlider::GetPageSize(void) const
{
    return (int)ceil(m_adjust->page_increment);
}

void wxSlider::SetThumbLength( int len )
{
    float flen = (float)len;
      
    if (fabs(flen-m_adjust->page_size) < 0.2) return;
      
    m_adjust->page_size = flen;

    gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
}

int wxSlider::GetThumbLength(void) const
{
    return (int)ceil(m_adjust->page_size);
}

void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
{
}

int wxSlider::GetLineSize(void) const
{
    return 0;
}

void wxSlider::SetTick( int WXUNUSED(tickPos) )
{
}

void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
{
}

int wxSlider::GetTickFreq(void) const
{
    return 0;
}

void wxSlider::ClearTicks(void)
{
}

void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
{
}

int wxSlider::GetSelEnd(void) const
{
    return 0;
}

int wxSlider::GetSelStart(void) const
{
    return 0;
}

void wxSlider::ClearSel(void)
{
}

bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
{
    GtkRange *range = GTK_RANGE(m_widget);
    return ( (window == GTK_WIDGET(range)->window) ||
             (window == range->trough) ||
	     (window == range->slider) ||
	     (window == range->step_forw) ||
	     (window == range->step_back) );
}

void wxSlider::ApplyWidgetStyle()
{
    SetWidgetStyle();
    gtk_widget_set_style( m_widget, m_widgetStyle );
}