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nautilus-horizontal-splitter.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* nautilus-horizontal-splitter.c - A horizontal splitter with a semi gradient look

   Copyright (C) 1999, 2000 Eazel, Inc.

   The Gnome Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The Gnome Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the Gnome Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Authors: Ramiro Estrugo <ramiro@eazel.com>
*/

#include <config.h>
#include "nautilus-horizontal-splitter.h"

#include <eel/eel-gtk-macros.h>
#include <stdlib.h>

struct NautilusHorizontalSplitterDetails {
      guint32 press_time;
      int press_position;
      int saved_size;
};

#define CLOSED_THRESHOLD 4
#define NOMINAL_SIZE 148
#define SPLITTER_CLICK_SLOP 4
#define SPLITTER_CLICK_TIMEOUT      400

static void nautilus_horizontal_splitter_class_init (NautilusHorizontalSplitterClass *horizontal_splitter_class);
static void nautilus_horizontal_splitter_init       (NautilusHorizontalSplitter      *horizontal_splitter);

EEL_CLASS_BOILERPLATE (NautilusHorizontalSplitter,
                   nautilus_horizontal_splitter,
                   GTK_TYPE_HPANED)

static void
nautilus_horizontal_splitter_init (NautilusHorizontalSplitter *horizontal_splitter)
{
      horizontal_splitter->details = g_new0 (NautilusHorizontalSplitterDetails, 1);
}

static void
nautilus_horizontal_splitter_finalize (GObject *object)
{
      NautilusHorizontalSplitter *horizontal_splitter;
      
      horizontal_splitter = NAUTILUS_HORIZONTAL_SPLITTER (object);

      g_free (horizontal_splitter->details);
      
      EEL_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}

static void
splitter_expand (NautilusHorizontalSplitter *splitter, int position)
{
      g_assert (NAUTILUS_IS_HORIZONTAL_SPLITTER (splitter));

      if (position >= CLOSED_THRESHOLD) {
            return;
      }

      position = splitter->details->saved_size;
      if (position < CLOSED_THRESHOLD) {
            position = NOMINAL_SIZE;
      }
      
      gtk_paned_set_position (GTK_PANED (splitter), position);
}

static void
splitter_collapse (NautilusHorizontalSplitter *splitter, int position)
{
      g_assert (NAUTILUS_IS_HORIZONTAL_SPLITTER (splitter));

      splitter->details->saved_size = position;
      gtk_paned_set_position (GTK_PANED (splitter), 0);
}

static void
splitter_toggle (NautilusHorizontalSplitter *splitter, int position)
{
      g_assert (NAUTILUS_IS_HORIZONTAL_SPLITTER (splitter));

      if (gtk_paned_get_position (GTK_PANED (splitter)) >= CLOSED_THRESHOLD) {
            nautilus_horizontal_splitter_collapse (splitter);
      } else {
            nautilus_horizontal_splitter_expand (splitter);
      }
}

static void
splitter_hide (NautilusHorizontalSplitter *splitter)
{
      GtkPaned *parent;

      parent = GTK_PANED (splitter);

      gtk_widget_hide (parent->child1);
}

static void
splitter_show (NautilusHorizontalSplitter *splitter)
{
      GtkPaned *parent;

      parent = GTK_PANED (splitter);

      gtk_widget_show (parent->child1);
}

static gboolean
splitter_is_hidden (NautilusHorizontalSplitter *splitter)
{
      GtkPaned *parent;
      
      parent = GTK_PANED (splitter);

      return gtk_widget_get_visible (parent->child1);
}

void
nautilus_horizontal_splitter_expand (NautilusHorizontalSplitter *splitter)
{
      splitter_expand (splitter, gtk_paned_get_position (GTK_PANED (splitter)));
}

void
nautilus_horizontal_splitter_hide (NautilusHorizontalSplitter *splitter)
{
      splitter_hide (splitter);
}

void
nautilus_horizontal_splitter_show (NautilusHorizontalSplitter *splitter)
{
      splitter_show (splitter);
}

gboolean
nautilus_horizontal_splitter_is_hidden (NautilusHorizontalSplitter *splitter)
{
      return splitter_is_hidden (splitter);
}

void
nautilus_horizontal_splitter_collapse (NautilusHorizontalSplitter *splitter)
{
      splitter_collapse (splitter, gtk_paned_get_position (GTK_PANED (splitter)));
}

/* routine to toggle the open/closed state of the splitter */
void
nautilus_horizontal_splitter_toggle_position (NautilusHorizontalSplitter *splitter)
{
      splitter_toggle (splitter, gtk_paned_get_position (GTK_PANED (splitter)));
}

/* NautilusHorizontalSplitter public methods */
GtkWidget *
nautilus_horizontal_splitter_new (void)
{
      return gtk_widget_new (nautilus_horizontal_splitter_get_type (), NULL);
}

/* handle mouse downs by remembering the position and the time */
static gboolean
nautilus_horizontal_splitter_button_press (GtkWidget *widget, GdkEventButton *event)
{
      gboolean result;
      NautilusHorizontalSplitter *splitter;
      int position;
      
      splitter = NAUTILUS_HORIZONTAL_SPLITTER (widget);

      position = gtk_paned_get_position (GTK_PANED (widget));

      result = EEL_CALL_PARENT_WITH_RETURN_VALUE
            (GTK_WIDGET_CLASS, button_press_event, (widget, event));

      if (result) {
            splitter->details->press_time = event->time;
            splitter->details->press_position = position;
      }

      return result;
}

/* handle mouse ups by seeing if it was a tap and toggling the open state accordingly */
static gboolean
nautilus_horizontal_splitter_button_release (GtkWidget *widget, GdkEventButton *event)
{
      gboolean result;
      NautilusHorizontalSplitter *splitter;
      int position, delta, delta_time;
      splitter = NAUTILUS_HORIZONTAL_SPLITTER (widget);

      position = gtk_paned_get_position (GTK_PANED (widget));

      result = EEL_CALL_PARENT_WITH_RETURN_VALUE
            (GTK_WIDGET_CLASS, button_release_event, (widget, event));

      if (result) {
            delta = abs (position - splitter->details->press_position);
            delta_time = event->time - splitter->details->press_time;
            if (delta < SPLITTER_CLICK_SLOP && delta_time < SPLITTER_CLICK_TIMEOUT)  {
                  nautilus_horizontal_splitter_toggle_position (splitter);
            }
      }

      return result;
}

static void
nautilus_horizontal_splitter_size_allocate (GtkWidget     *widget,
                                  GtkAllocation *allocation)
{
      gint border_width;
      GtkPaned *paned;
      GtkAllocation child_allocation;
      GtkRequisition child_requisition;
      
      paned = GTK_PANED (widget);
      border_width = GTK_CONTAINER (paned)->border_width;

      widget->allocation = *allocation;

      if (paned->child2 != NULL && gtk_widget_get_visible (paned->child2)) { 
            EEL_CALL_PARENT (GTK_WIDGET_CLASS, size_allocate,
                         (widget, allocation));
      } else if (paned->child1 && gtk_widget_get_visible (paned->child1)) {

            if (gtk_widget_get_realized (widget)) {
                  gdk_window_hide (paned->handle);
            }

            gtk_widget_get_child_requisition (paned->child1,
                                      &child_requisition);
            
            child_allocation.x = widget->allocation.x + border_width;
            child_allocation.y = widget->allocation.y + border_width;
            child_allocation.width = MIN (child_requisition.width,
                                    allocation->width - 2 * border_width);
            child_allocation.height = MIN (child_requisition.height,
                                     allocation->height - 2 * border_width);
            
            gtk_widget_size_allocate (paned->child1, &child_allocation);
      } else
            if (gtk_widget_get_realized (widget)) {
                  gdk_window_hide (paned->handle);
            }

}

static void
nautilus_horizontal_splitter_class_init (NautilusHorizontalSplitterClass *class)
{
      GtkWidgetClass *widget_class;
      
      widget_class = GTK_WIDGET_CLASS (class);

      G_OBJECT_CLASS (class)->finalize = nautilus_horizontal_splitter_finalize;

      widget_class->size_allocate = nautilus_horizontal_splitter_size_allocate;
      widget_class->button_press_event = nautilus_horizontal_splitter_button_press;
      widget_class->button_release_event = nautilus_horizontal_splitter_button_release;
}

void
nautilus_horizontal_splitter_pack2 (NautilusHorizontalSplitter *splitter,
                            GtkWidget                  *child2)
{
      GtkPaned *paned;
      
      g_return_if_fail (GTK_IS_WIDGET (child2));
      g_return_if_fail (NAUTILUS_IS_HORIZONTAL_SPLITTER (splitter));

      paned = GTK_PANED (splitter);
      gtk_paned_pack2 (paned, child2, TRUE, FALSE);
}

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