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pane.c
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pane.c
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/* a side panel that can slide in and out of view
*/
/*
Copyright (C) 1991-2003 The National Gallery
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#include "ip.h"
/*
#define DEBUG
*/
/* Our signals.
*/
enum {
SIG_CHANGED, /* Change to position or openness */
SIG_LAST
};
static GtkHPanedClass *parent_class = NULL;
static guint pane_signals[SIG_LAST] = { 0 };
#ifdef DEBUG
static char *
pane_handedness2char( PaneHandedness handedness )
{
switch( handedness ) {
case PANE_HIDE_LEFT: return( "PANE_HIDE_LEFT" );
case PANE_HIDE_RIGHT: return( "PANE_HIDE_RIGHT" );
default: g_assert( 0 );
}
}
#endif /*DEBUG*/
static void
pane_changed( Pane *pane )
{
g_assert( IS_PANE( pane ) );
#ifdef DEBUG
printf( "pane_changed: %p %s\n",
pane, pane_handedness2char( pane->handedness ) );
#endif /*DEBUG*/
g_signal_emit( G_OBJECT( pane ), pane_signals[SIG_CHANGED], 0 );
}
static int
pane_closed_position( Pane *pane )
{
/* Can't use max/min since we need to be able to work before our
* window has been built.
*/
return( pane->handedness == PANE_HIDE_RIGHT ? 10000 : 0 );
}
/* An open position ... used in case we are asked to open, but the position is
* already closed.
*/
static int
pane_open_position( Pane *pane )
{
int max_position;
int min_position;
g_object_get( pane,
"max_position", &max_position,
"min_position", &min_position,
NULL );
return( pane->handedness == PANE_HIDE_RIGHT ?
max_position - 200: min_position + 200 );
}
static void
pane_destroy( GtkObject *object )
{
Pane *pane;
g_return_if_fail( object != NULL );
g_return_if_fail( IS_PANE( object ) );
pane = PANE( object );
#ifdef DEBUG
printf( "pane_destroy: %p %s\n",
pane, pane_handedness2char( pane->handedness ) );
#endif /*DEBUG*/
/* My instance destroy stuff.
*/
IM_FREEF( g_source_remove, pane->animate_timeout );
GTK_OBJECT_CLASS( parent_class )->destroy( object );
}
static void
pane_class_init( PaneClass *class )
{
GtkObjectClass *object_class = (GtkObjectClass *) class;
parent_class = g_type_class_peek_parent( class );
object_class->destroy = pane_destroy;
class->changed = NULL;
pane_signals[SIG_CHANGED] = g_signal_new( "changed",
G_OBJECT_CLASS_TYPE( object_class ),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET( PaneClass, changed ),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0 );
}
/* Position property has changed. We block the notify signal before we set
* position, so this change must have come from a user drag or parent window
* resize.
*/
static void
pane_notify_position_cb( Pane *pane )
{
int max_position;
int min_position;
int position;
/* Can get here even though we block notify during position set in
* animate, because of delays in window setup.
*/
if( pane->animate_timeout )
return;
g_object_get( pane,
"max_position", &max_position,
"min_position", &min_position,
NULL );
/* We can have 10,000 as position (meaning way to the
* right), take account of any clipping there may be.
*/
pane->position = IM_CLIP( min_position, pane->position, max_position );
/* And the new value.
*/
position = gtk_paned_get_position( GTK_PANED( pane ) );
#ifdef DEBUG
printf( "pane_notify_position_cb: %p %s %d\n",
pane, pane_handedness2char( pane->handedness ), position );
#endif /*DEBUG*/
pane_set_position( pane, position );
pane_set_user_position( pane, position );
/* Look for dragged close.
*/
if( pane->open &&
pane->handedness == PANE_HIDE_LEFT &&
position == min_position )
pane_set_open( pane, FALSE );
if( pane->open &&
pane->handedness == PANE_HIDE_RIGHT &&
position == max_position )
pane_set_open( pane, FALSE );
}
static void
pane_init( Pane *pane )
{
pane->handedness = PANE_HIDE_LEFT;
pane->panechild = NULL;
pane->open = FALSE;
pane->position = 0;
pane->user_position = 0; /* overwritten on _link() */
pane->target_position = 0;
pane->close_on_end = FALSE;
pane->last_set_position = 0;
pane->animate_timeout = 0;
g_signal_connect( pane, "notify::position",
G_CALLBACK( pane_notify_position_cb ), NULL );
}
GType
pane_get_type( void )
{
static GType type = 0;
if( !type ) {
static const GTypeInfo info = {
sizeof( PaneClass ),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) pane_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof( Pane ),
32, /* n_preallocs */
(GInstanceInitFunc) pane_init,
};
type = g_type_register_static( GTK_TYPE_HPANED,
"Pane", &info, 0 );
}
return( type );
}
/* Operations on the model.
*/
void
pane_set_position( Pane *pane, int position )
{
if( pane->position != position ) {
#ifdef DEBUG
printf( "pane_set_position: %p %s %d\n",
pane, pane_handedness2char( pane->handedness ),
position );
#endif /*DEBUG*/
g_signal_handlers_block_by_func( pane,
pane_notify_position_cb, NULL );
gtk_paned_set_position( GTK_PANED( pane ), position );
g_signal_handlers_unblock_by_func( pane,
pane_notify_position_cb, NULL );
pane->position = position;
pane_changed( pane );
}
}
void
pane_set_user_position( Pane *pane, int user_position )
{
if( pane->user_position != user_position ) {
#ifdef DEBUG
printf( "pane_set_user_position: %p %s %d\n",
pane, pane_handedness2char( pane->handedness ),
user_position );
#endif /*DEBUG*/
pane->user_position = user_position;
pane_changed( pane );
}
}
void
pane_set_open( Pane *pane, gboolean open )
{
if( pane->open != open ) {
#ifdef DEBUG
printf( "pane_set_open: %p %s %d\n",
pane, pane_handedness2char( pane->handedness ),
open );
#endif /*DEBUG*/
widget_visible( GTK_WIDGET( pane->panechild ), open );
pane->open = open;
pane_changed( pane );
}
}
/* Set everything all at once on startup.
*/
void
pane_set_state( Pane *pane, gboolean open, int user_position )
{
if( pane->open != open ||
pane->user_position != user_position ) {
g_signal_handlers_block_by_func( pane,
pane_notify_position_cb, NULL );
gtk_paned_set_position( GTK_PANED( pane ), user_position );
g_signal_handlers_unblock_by_func( pane,
pane_notify_position_cb, NULL );
widget_visible( GTK_WIDGET( pane->panechild ), open );
pane->open = open;
pane->user_position = user_position;
pane->position = user_position;
pane_changed( pane );
}
}
void
pane_set_child( Pane *pane, Panechild *panechild )
{
g_assert( !pane->panechild );
pane->panechild = panechild;
if( pane->handedness == PANE_HIDE_LEFT )
gtk_paned_pack1( GTK_PANED( pane ),
GTK_WIDGET( panechild ), TRUE, TRUE );
else
gtk_paned_pack2( GTK_PANED( pane ),
GTK_WIDGET( panechild ), TRUE, TRUE );
}
/* Control.
*/
static gboolean
pane_animate_timeout_cb( Pane *pane )
{
int position = pane->position;
int target = pane->target_position;
int new;
gboolean more;
#ifdef DEBUG
printf( "pane_animate_timeout_cb: %p %s\n",
pane, pane_handedness2char( pane->handedness ) );
#endif /*DEBUG*/
more = TRUE;
new = position + (target - position) / 2;
if( ABS( position - target ) < 5 ||
new == pane->last_set_position ) {
/* At our target!
*/
new = target;
more = FALSE;
pane->animate_timeout = 0;
}
pane_set_position( pane, new );
pane->last_set_position = new;
if( !more &&
pane->close_on_end )
pane_set_open( pane, FALSE );
return( more );
}
/* Close the pane with an animation.
*/
void
pane_animate_closed( Pane *pane )
{
if( !pane->animate_timeout &&
pane->open ) {
int max_position;
int min_position;
int target_position;
target_position = pane_closed_position( pane );
g_object_get( pane,
"max_position", &max_position,
"min_position", &min_position,
NULL );
/* Can be zero if we're here very early.
*/
if( max_position > 0 )
target_position =
IM_CLIP( min_position,
target_position, max_position );
pane->target_position = target_position;
pane->close_on_end = TRUE;
pane->last_set_position = -1;
pane->animate_timeout = g_timeout_add( 50,
(GSourceFunc) pane_animate_timeout_cb, pane );
}
}
/* Open the pane with an animation.
*/
void
pane_animate_open( Pane *pane )
{
if( !pane->animate_timeout &&
!pane->open ) {
int max_position;
int min_position;
int target_position;
target_position = pane->user_position;
g_object_get( pane,
"max_position", &max_position,
"min_position", &min_position,
NULL );
/* Can be zero if we're here very early.
*/
if( max_position > 0 )
target_position =
IM_CLIP( min_position,
target_position, max_position );
/* user_position can be max or min if the pane was dragged
* closed.
*/
if( target_position == max_position ||
target_position == min_position )
target_position = pane_open_position( pane );
#ifdef DEBUG
printf( "pane_animate_open: %p %s %d\n",
pane, pane_handedness2char( pane->handedness ),
target_position );
#endif /*DEBUG*/
pane->target_position = target_position;
pane->close_on_end = FALSE;
pane->last_set_position = -1;
pane_set_open( pane, TRUE );
pane->animate_timeout = g_timeout_add( 50,
(GSourceFunc) pane_animate_timeout_cb, pane );
}
}
static void
pane_link( Pane *pane, PaneHandedness handedness )
{
#ifdef DEBUG
printf( "pane_link: %p %s\n",
pane, pane_handedness2char( handedness ) );
#endif /*DEBUG*/
pane->handedness = handedness;
pane_set_open( pane, FALSE );
}
Pane *
pane_new( PaneHandedness handedness )
{
Pane *pane;
pane = PANE( g_object_new( TYPE_PANE, NULL ) );
pane_link( pane, handedness );
return( pane );
}