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7c2f14eeb84c08651a96050ff1f05d195fe3db7f
wxWidgets/src/gtk1/scrolbar.cpp
Robert Roebling 7c2f14eeb8 Commited scrollbar patch which sends lineup, linedown 
events based on intercepting the mouse down events.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31392 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2005-01-16 15:23:16 +00:00

369 lines
11 KiB
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/////////////////////////////////////////////////////////////////////////////
// Name: src/gtk/scrolbar.cpp
// Purpose:
// Author: Robert Roebling
// Id: $Id$
// Copyright: (c) 1998 Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "scrolbar.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#if wxUSE_SCROLLBAR
#include "wx/scrolbar.h"
#include "wx/utils.h"
#include "wx/math.h"
#include "wx/gtk/private.h"
//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------
extern void wxapp_install_idle_handler();
extern bool g_isIdle;
//-----------------------------------------------------------------------------
// data
//-----------------------------------------------------------------------------
extern bool g_blockEventsOnDrag;
extern bool g_blockEventsOnScroll;
static wxEventType g_currentUpDownEvent = wxEVT_NULL;
static const float sensitivity = 0.02;
//-----------------------------------------------------------------------------
// "value_changed"
//-----------------------------------------------------------------------------
// FIXME: is GtkScrollType really passed to us as 2nd argument?
static void gtk_scrollbar_callback( GtkAdjustment *adjust,
SCROLLBAR_CBACK_ARG
wxScrollBar *win )
{
if (g_isIdle) wxapp_install_idle_handler();
if (!win->m_hasVMT) return;
if (g_blockEventsOnDrag) return;
float diff = adjust->value - win->m_oldPos;
if (fabs(diff) < sensitivity) return;
win->m_oldPos = adjust->value;
wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
double dvalue = adjust->value;
int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
wxScrollEvent event( command, win->GetId(), value, orient );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
// throw a LINEUP / LINEDOWN event if necessary
if (g_currentUpDownEvent != wxEVT_NULL)
{
wxScrollEvent event( g_currentUpDownEvent, win->GetId(), value, orient );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
}
/*
wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
cevent.SetEventObject( win );
win->ProcessEvent( cevent );
*/
}
//-----------------------------------------------------------------------------
// "button_press_event" from slider
//-----------------------------------------------------------------------------
static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
GdkEventButton *gdk_event,
wxScrollBar *win )
{
if (g_isIdle) wxapp_install_idle_handler();
// check if a LINEUP/LINEDOWN event must be thrown
// I suppose here the size of scrollbar top/bottom buttons is 16px height
if (gdk_event->type == GDK_BUTTON_PRESS && gdk_event->button == 1)
{
int scroll_height, mouse_pos;
// get the mouse position when the click is done
if (widget->orientation == GTK_ORIENTATION_VERTICAL)
{
scroll_height = GTK_WIDGET(widget)->allocation.height - 16;
mouse_pos = (int)gdk_event->y;
}
else
{
scroll_height = GTK_WIDGET(widget)->allocation.width - 16;
mouse_pos = (int)gdk_event->x;
}
// compare mouse position to scrollbar height
if (mouse_pos > scroll_height)
g_currentUpDownEvent = wxEVT_SCROLL_LINEDOWN;
else if (mouse_pos < 16)
g_currentUpDownEvent = wxEVT_SCROLL_LINEUP;
}
#ifndef __WXGTK20__
// There is no slider field any more
win->m_isScrolling = (gdk_event->window == widget->slider);
#endif
return FALSE;
}
//-----------------------------------------------------------------------------
// "button_release_event" from slider
//-----------------------------------------------------------------------------
static gint
gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
GdkEventButton *WXUNUSED(gdk_event),
wxScrollBar *win )
{
if (g_isIdle)
wxapp_install_idle_handler();
if (win->m_isScrolling)
{
wxEventType command = wxEVT_SCROLL_THUMBRELEASE;
int value = (int)ceil(win->m_adjust->value);
int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
wxScrollEvent event( command, win->GetId(), value, orient );
event.SetEventObject( win );
win->GetEventHandler()->ProcessEvent( event );
}
win->m_isScrolling = FALSE;
// reset the LINEUP/LINEDOWN flag when the mouse button is released
g_currentUpDownEvent = wxEVT_NULL;
return FALSE;
}
//-----------------------------------------------------------------------------
// wxScrollBar
//-----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
wxScrollBar::~wxScrollBar()
{
}
bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
const wxPoint& pos, const wxSize& size,
long style, const wxValidator& validator, const wxString& name )
{
m_needParent = TRUE;
m_acceptsFocus = TRUE;
if (!PreCreation( parent, pos, size ) ||
!CreateBase( parent, id, pos, size, style, validator, name ))
{
wxFAIL_MSG( wxT("wxScrollBar creation failed") );
return FALSE;
}
m_oldPos = 0.0;
if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
else
m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
gtk_signal_connect( GTK_OBJECT(m_adjust),
"value_changed",
(GtkSignalFunc) gtk_scrollbar_callback,
(gpointer) this );
gtk_signal_connect( GTK_OBJECT(m_widget),
"button_press_event",
(GtkSignalFunc)gtk_scrollbar_button_press_callback,
(gpointer) this );
gtk_signal_connect( GTK_OBJECT(m_widget),
"button_release_event",
(GtkSignalFunc)gtk_scrollbar_button_release_callback,
(gpointer) this );
m_parent->DoAddChild( this );
PostCreation(size);
return TRUE;
}
int wxScrollBar::GetThumbPosition() const
{
double val = m_adjust->value;
return (int)(val < 0 ? val - 0.5 : val + 0.5);
}
int wxScrollBar::GetThumbSize() const
{
return (int)(m_adjust->page_size+0.5);
}
int wxScrollBar::GetPageSize() const
{
return (int)(m_adjust->page_increment+0.5);
}
int wxScrollBar::GetRange() const
{
return (int)(m_adjust->upper+0.5);
}
void wxScrollBar::SetThumbPosition( int viewStart )
{
if (m_isScrolling) return;
float fpos = (float)viewStart;
m_oldPos = fpos;
if (fabs(fpos-m_adjust->value) < 0.2) return;
m_adjust->value = fpos;
gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
(GtkSignalFunc) gtk_scrollbar_callback,
(gpointer) this );
gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
gtk_signal_connect( GTK_OBJECT(m_adjust),
"value_changed",
(GtkSignalFunc) gtk_scrollbar_callback,
(gpointer) this );
}
void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
bool WXUNUSED(refresh) )
{
float fpos = (float)position;
float frange = (float)range;
float fthumb = (float)thumbSize;
float fpage = (float)pageSize;
if ((fabs(frange-m_adjust->upper) < 0.2) &&
(fabs(fthumb-m_adjust->page_size) < 0.2) &&
(fabs(fpage-m_adjust->page_increment) < 0.2))
{
SetThumbPosition( position );
return;
}
m_oldPos = fpos;
m_adjust->lower = 0.0;
m_adjust->upper = frange;
m_adjust->value = fpos;
m_adjust->step_increment = 1.0;
m_adjust->page_increment = (float)(wxMax(fpage,0));
m_adjust->page_size = fthumb;
gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
}
/* Backward compatibility */
int wxScrollBar::GetValue() const
{
return GetThumbPosition();
}
void wxScrollBar::SetValue( int viewStart )
{
SetThumbPosition( viewStart );
}
void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
{
int pos = (int)(m_adjust->value+0.5);
int thumb = (int)(m_adjust->page_size+0.5);
int page = (int)(m_adjust->page_increment+0.5);
int range = (int)(m_adjust->upper+0.5);
*viewStart = pos;
*viewLength = range;
*objectLength = thumb;
*pageLength = page;
}
int wxScrollBar::GetViewLength() const
{
return (int)(m_adjust->upper+0.5);
}
int wxScrollBar::GetObjectLength() const
{
return (int)(m_adjust->page_size+0.5);
}
void wxScrollBar::SetPageSize( int pageLength )
{
int pos = (int)(m_adjust->value+0.5);
int thumb = (int)(m_adjust->page_size+0.5);
int range = (int)(m_adjust->upper+0.5);
SetScrollbar( pos, thumb, range, pageLength );
}
void wxScrollBar::SetObjectLength( int objectLength )
{
int pos = (int)(m_adjust->value+0.5);
int page = (int)(m_adjust->page_increment+0.5);
int range = (int)(m_adjust->upper+0.5);
SetScrollbar( pos, objectLength, range, page );
}
void wxScrollBar::SetViewLength( int viewLength )
{
int pos = (int)(m_adjust->value+0.5);
int thumb = (int)(m_adjust->page_size+0.5);
int page = (int)(m_adjust->page_increment+0.5);
SetScrollbar( pos, thumb, viewLength, page );
}
bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
{
GtkRange *range = GTK_RANGE(m_widget);
return ( (window == GTK_WIDGET(range)->window)
#ifndef __WXGTK20__
|| (window == range->trough)
|| (window == range->slider)
|| (window == range->step_forw)
|| (window == range->step_back)
#endif // GTK+ 1.x
);
}
wxSize wxScrollBar::DoGetBestSize() const
{
return wxControl::DoGetBestSize();
}
// static
wxVisualAttributes
wxScrollBar::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
{
return GetDefaultAttributesFromGTKWidget(gtk_vscrollbar_new);
}
#endif
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