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kz-paned.c

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

/*
 *  Copyright (C) 2003 Hiroyuki Ikezoe
 *
 *  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, 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 codes originated in gtkhpaned.c and gtkvpaned.c in GTK+.
 */

#include "kz-paned.h"

#include "gobject-utils.h"
#include "gtk-utils.h"
#include <glib/gi18n.h>

enum {
      CHANGED_POSITION,
      LAST_SIGNAL
};

/* object class */
static void kz_paned_class_init     (KzPanedClass   *klass);
static void kz_paned_init           (KzPaned        *kzpaned);
static void kz_paned_size_request   (GtkWidget      *widget,
                             GtkRequisition *requisition);
static void kz_paned_size_allocate  (GtkWidget      *widget,
                             GtkAllocation  *allocation);
static void kz_paned_hsize_request  (GtkWidget      *widget,
                             GtkRequisition *requisition);
static void kz_paned_hsize_allocate (GtkWidget      *widget,
                             GtkAllocation  *allocation);
static void kz_paned_vsize_request  (GtkWidget      *widget,
                             GtkRequisition *requisition);
static void kz_paned_vsize_allocate (GtkWidget      *widget,
                             GtkAllocation  *allocation);

static void kz_paned_rotate_position      (KzPaned *kzpaned);
static void kz_paned_flip_position        (KzPaned *kzpaned);
static void kz_paned_set_divider_position (KzPaned *kzpaned);

#define KZ_PANED_SET_VERTICAL(kzpaned)                            \
{                                                     \
      GTK_PANED(kzpaned)->cursor_type = GDK_SB_V_DOUBLE_ARROW;    \
      GTK_PANED(kzpaned)->orientation = GTK_ORIENTATION_HORIZONTAL;     \
}

#define KZ_PANED_SET_HORIZONTAL(kzpaned)                    \
{                                                     \
      GTK_PANED(kzpaned)->cursor_type = GDK_SB_H_DOUBLE_ARROW;    \
      GTK_PANED(kzpaned)->orientation = GTK_ORIENTATION_VERTICAL; \
}

static GtkPanedClass *parent_class = NULL;

static gint kz_paned_signals[LAST_SIGNAL] = {0};
 
KZ_OBJECT_GET_TYPE(kz_paned, "KzPaned", KzPaned,
               kz_paned_class_init, kz_paned_init,
               GTK_TYPE_PANED)

static void
kz_paned_class_init (KzPanedClass *klass)
{
      GtkWidgetClass *widget_class;

      parent_class = g_type_class_peek_parent (klass);

      widget_class  = (GtkWidgetClass *) klass;

      widget_class->size_request  = kz_paned_size_request;
      widget_class->size_allocate = kz_paned_size_allocate;
      
      klass->changed_position = NULL;

      kz_paned_signals[CHANGED_POSITION]
            = g_signal_new ("changed_position",
                        G_TYPE_FROM_CLASS (klass),
                        G_SIGNAL_RUN_LAST,
                        G_STRUCT_OFFSET (KzPanedClass, changed_position),
                        NULL, NULL,
                        g_cclosure_marshal_VOID__INT,
                        G_TYPE_NONE, 1,
                        G_TYPE_INT);
}


static void
kz_paned_init (KzPaned *kzpaned)
{
      KZ_PANED_SET_HORIZONTAL(kzpaned);   
      kzpaned->position  = GTK_POS_LEFT;
}


GtkWidget *
kz_paned_new (void)
{
      KzPaned *kzpaned;

      kzpaned = g_object_new (KZ_TYPE_PANED, NULL);

      return GTK_WIDGET (kzpaned);
}


void
kz_paned_set_position(KzPaned *kzpaned, GtkPositionType position)
{
      GtkPositionType prev_pos;
      prev_pos = kzpaned->position;

      kzpaned->position = position;
      switch(position)
      {
       case GTK_POS_LEFT:
            KZ_PANED_SET_HORIZONTAL(kzpaned);
            if (prev_pos == GTK_POS_BOTTOM)
                  kz_paned_rotate_position(kzpaned);
            else if (prev_pos == GTK_POS_RIGHT)
                  kz_paned_flip_position(kzpaned);
            break;
       case GTK_POS_RIGHT:
            KZ_PANED_SET_HORIZONTAL(kzpaned);
            if (prev_pos == GTK_POS_TOP)
                  kz_paned_rotate_position(kzpaned);
            else if (prev_pos == GTK_POS_LEFT)
                  kz_paned_flip_position(kzpaned);
            else if (prev_pos == GTK_POS_BOTTOM)
                  kz_paned_set_divider_position(kzpaned);
            break;
       case GTK_POS_TOP:
            KZ_PANED_SET_VERTICAL(kzpaned);
            if (prev_pos == GTK_POS_RIGHT)
                  kz_paned_rotate_position(kzpaned);
            else if (prev_pos == GTK_POS_BOTTOM)
                  kz_paned_flip_position(kzpaned);
            break;
       case GTK_POS_BOTTOM:
            KZ_PANED_SET_VERTICAL(kzpaned);
            if (prev_pos == GTK_POS_LEFT)
                  kz_paned_rotate_position(kzpaned);
            else if (prev_pos == GTK_POS_TOP)
                  kz_paned_flip_position(kzpaned);
            else if (prev_pos == GTK_POS_RIGHT)
                  kz_paned_set_divider_position(kzpaned);
            break;
       default:
            break;
      }     
      gtk_widget_queue_resize(GTK_WIDGET(kzpaned));

      g_signal_emit(kzpaned,
                  kz_paned_signals[CHANGED_POSITION],
                  0,
                  position);
}


static void
kz_paned_set_divider_position(KzPaned *kzpaned)
{
      GtkPaned *paned;
      GtkWidget *child1, *child2;
      gint child1_width, child1_height;
      gint child2_width, child2_height;
      
      paned = GTK_PANED(kzpaned);

      child1 = paned->child1;
      child2 = paned->child2;
      child1_width  = child1->allocation.width;
      child1_height = child1->allocation.height;
      child2_width  = child2->allocation.width;
      child2_height = child2->allocation.height;

      switch(kzpaned->position)
      {
       case GTK_POS_RIGHT:/* only from GTK_POS_BOTTOM */
            gtk_paned_set_position(paned, child1_width - child2_height);
            break;
       case GTK_POS_BOTTOM: /* only from GTK_POS_RIGHT */
            gtk_paned_set_position(paned, child1_height - child2_width);
            break;
       default:
            break;
      }
}


static void
kz_paned_rotate_position(KzPaned *kzpaned)
{
      GtkPaned *paned;
      GtkWidget *child1, *child2;
      gint child1_width, child1_height;
      gint child2_width, child2_height;
      
      paned = GTK_PANED(kzpaned);

      child1 = paned->child1;
      child2 = paned->child2;
      child1_width  = child1->allocation.width;
      child1_height = child1->allocation.height;
      child2_width  = child2->allocation.width;
      child2_height = child2->allocation.height;

      paned->child1 = child2;
      paned->child2 = child1;
      
      /*
       * When pane is divided in horizontal, child1_height always equals child2_height.
       * When pane is divided in vertical, child1_width always equals child2_width.
       */

      switch(kzpaned->position)
      {
       case GTK_POS_LEFT: /* only from GTK_POS_BOTTOM */
            gtk_paned_set_position(paned, child2_height);
            break;
       case GTK_POS_RIGHT:/* only from GTK_POS_TOP */
            gtk_paned_set_position(paned, child1_width - child1_height);
            break;
       case GTK_POS_TOP: /* only from GTK_POS_RIGHT */
            gtk_paned_set_position(paned, child2_width);
            break;
       case GTK_POS_BOTTOM: /* only from GTK_POS_LEFT */
            gtk_paned_set_position(paned, child1_height - child1_width);
            break;
       default:
            break;
      }
}


static void
kz_paned_flip_position(KzPaned *kzpaned)
{
      GtkPaned *paned;
      GtkWidget *child1, *child2;
      gint child2_width, child2_height;
      
      paned = GTK_PANED(kzpaned);

      child1 = paned->child1;
      child2 = paned->child2;
      child2_width  = child2->allocation.width;
      child2_height = child2->allocation.height;

      paned->child1 = child2;
      paned->child2 = child1;
      switch(kzpaned->position)
      {
       case GTK_POS_LEFT:
       case GTK_POS_RIGHT:
            gtk_paned_set_position(paned, child2_width);
            break;
       case GTK_POS_TOP:
       case GTK_POS_BOTTOM:
            gtk_paned_set_position(paned, child2_height);
            break;
       default:
            break;
      }
}


static void
kz_paned_size_request (GtkWidget      *widget,
                   GtkRequisition *requisition)
{
      KzPaned *kzpaned;
      g_return_if_fail (KZ_IS_PANED (widget));
      kzpaned = KZ_PANED (widget);

      switch(kzpaned->position)
      {
       case GTK_POS_LEFT:
       case GTK_POS_RIGHT:
            kz_paned_hsize_request(widget, requisition);
            break;
       case GTK_POS_TOP:
       case GTK_POS_BOTTOM:
            kz_paned_vsize_request(widget, requisition);
            break;
       default:
            break;
      }
}


static void
kz_paned_size_allocate (GtkWidget     *widget,
                  GtkAllocation *allocation)
{
      KzPaned *kzpaned;
      g_return_if_fail (KZ_IS_PANED (widget));
      kzpaned = KZ_PANED (widget);
      
      switch(kzpaned->position)
      {
       case GTK_POS_LEFT:
       case GTK_POS_RIGHT:
            kz_paned_hsize_allocate(widget, allocation);
            break;
       case GTK_POS_TOP:
       case GTK_POS_BOTTOM:
            kz_paned_vsize_allocate(widget, allocation);
            break;
       default:
            break;
      }
}


static void
kz_paned_vsize_request (GtkWidget      *widget,
                  GtkRequisition *requisition)
{
      GtkPaned *paned = GTK_PANED (widget);
      GtkRequisition child_requisition;

      requisition->width = 0;
      requisition->height = 0;

      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1))
      {
            gtk_widget_size_request (paned->child1, &child_requisition);

            requisition->height = child_requisition.height;
            requisition->width = child_requisition.width;
      }

      if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
      {
            gtk_widget_size_request (paned->child2, &child_requisition);

            requisition->width = MAX (requisition->width, child_requisition.width);
            requisition->height += child_requisition.height;
      }

      requisition->height += GTK_CONTAINER (paned)->border_width * 2;
      requisition->width += GTK_CONTAINER (paned)->border_width * 2;
  
      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1) &&
          paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
      {
            gint handle_size;

            gtk_widget_style_get (widget, "handle_size", &handle_size, NULL);
            requisition->height += handle_size;
      }
}

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

      widget->allocation = *allocation;

      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1) &&
          paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
      {
            GtkRequisition child1_requisition;
            GtkRequisition child2_requisition;
            GtkAllocation child1_allocation;
            GtkAllocation child2_allocation;
            gint handle_size;
      
            gtk_widget_style_get (widget, "handle_size", &handle_size, NULL);

            gtk_widget_get_child_requisition (paned->child1, &child1_requisition);
            gtk_widget_get_child_requisition (paned->child2, &child2_requisition);
# warning FIXME! this function is deprecated in GTK+-2.4.0.    
            gtk_paned_compute_position (paned,
                                  MAX (1, widget->allocation.height
                                     - handle_size
                                     - 2 * border_width),
                                  child1_requisition.height,
                                  child2_requisition.height);

            paned->handle_pos.x = widget->allocation.x + border_width;
            paned->handle_pos.y = widget->allocation.y + paned->child1_size + border_width;
            paned->handle_pos.width = MAX (1, (gint) widget->allocation.width - 2 * border_width);
            paned->handle_pos.height = handle_size;
      
            if (GTK_WIDGET_REALIZED (widget))
            {
                  if (GTK_WIDGET_MAPPED (widget))
                        gdk_window_show (paned->handle);
                  gdk_window_move_resize (paned->handle,
                                    paned->handle_pos.x,
                                    paned->handle_pos.y,
                                    paned->handle_pos.width,
                                    handle_size);
            }

            child1_allocation.width = child2_allocation.width = MAX (1, (gint) allocation->width - border_width * 2);
            child1_allocation.height = MAX (1, paned->child1_size);
            child1_allocation.x = child2_allocation.x = widget->allocation.x + border_width;
            child1_allocation.y = widget->allocation.y + border_width;
      
            child2_allocation.y = child1_allocation.y + paned->child1_size + paned->handle_pos.height;
            child2_allocation.height = MAX (1, widget->allocation.y + widget->allocation.height - child2_allocation.y - border_width);
      
            /* Now allocate the childen, making sure, when resizing not to
             * overlap the windows
             */
            if (GTK_WIDGET_MAPPED (widget) &&
                paned->child1->allocation.height < child1_allocation.height)
            {
                  gtk_widget_size_allocate (paned->child2, &child2_allocation);
                  gtk_widget_size_allocate (paned->child1, &child1_allocation);
            }
            else
            {
                  gtk_widget_size_allocate (paned->child1, &child1_allocation);
                  gtk_widget_size_allocate (paned->child2, &child2_allocation);
            }
      }
      else
      {
            GtkAllocation child_allocation;

            if (GTK_WIDGET_REALIZED (widget))      
                  gdk_window_hide (paned->handle);

            if (paned->child1)
                  gtk_widget_set_child_visible (paned->child1, TRUE);
            if (paned->child2)
                  gtk_widget_set_child_visible (paned->child2, TRUE);

            child_allocation.x = widget->allocation.x + border_width;
            child_allocation.y = widget->allocation.y + border_width;
            child_allocation.width = MAX (1, allocation->width - 2 * border_width);
            child_allocation.height = MAX (1, allocation->height - 2 * border_width);

            if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1))
                  gtk_widget_size_allocate (paned->child1, &child_allocation);
            else if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
                  gtk_widget_size_allocate (paned->child2, &child_allocation);
      }
}

static void
kz_paned_hsize_request (GtkWidget      *widget,
                  GtkRequisition *requisition)
{
      GtkPaned *paned = GTK_PANED (widget);
      GtkRequisition child_requisition;

      requisition->width = 0;
      requisition->height = 0;

      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1))
      {
            gtk_widget_size_request (paned->child1, &child_requisition);

            requisition->height = child_requisition.height;
            requisition->width = child_requisition.width;
      }

      if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
      {
            gtk_widget_size_request (paned->child2, &child_requisition);

            requisition->height = MAX(requisition->height, child_requisition.height);
            requisition->width += child_requisition.width;
      }

      requisition->width += GTK_CONTAINER (paned)->border_width * 2;
      requisition->height += GTK_CONTAINER (paned)->border_width * 2;

      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1) &&
          paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
      {
            gint handle_size;
      
            gtk_widget_style_get (widget, "handle_size", &handle_size, NULL);
            requisition->width += handle_size;
      }
}

static void
flip_child (GtkWidget *widget, GtkAllocation *child_pos)
{
      gint x = widget->allocation.x;
      gint width = widget->allocation.width;

      child_pos->x = 2 * x + width - child_pos->x - child_pos->width;
}

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

      widget->allocation = *allocation;

      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1) &&
          paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
      {
            GtkAllocation child1_allocation;
            GtkAllocation child2_allocation;
            GtkRequisition child1_requisition;
            GtkRequisition child2_requisition;
            gint handle_size;
      
            gtk_widget_style_get (widget, "handle_size", &handle_size, NULL);

            gtk_widget_get_child_requisition (paned->child1, &child1_requisition);
            gtk_widget_get_child_requisition (paned->child2, &child2_requisition);
      
            gtk_paned_compute_position (paned,
                                  MAX (1, widget->allocation.width
                                     - handle_size
                                     - 2 * border_width),
                                  child1_requisition.width,
                                  child2_requisition.width);
      
            paned->handle_pos.x = widget->allocation.x + paned->child1_size + border_width;
            paned->handle_pos.y = widget->allocation.y + border_width;
            paned->handle_pos.width = handle_size;
            paned->handle_pos.height = MAX (1, widget->allocation.height - 2 * border_width);

            child1_allocation.height = child2_allocation.height = MAX (1, (gint) allocation->height - border_width * 2);
            child1_allocation.width = MAX (1, paned->child1_size);
            child1_allocation.x = widget->allocation.x + border_width;
            child1_allocation.y = child2_allocation.y = widget->allocation.y + border_width;

            child2_allocation.x = child1_allocation.x + paned->child1_size + paned->handle_pos.width;
            child2_allocation.width = MAX (1, widget->allocation.x + widget->allocation.width - child2_allocation.x - border_width);

            if (gtk_widget_get_direction (GTK_WIDGET (widget)) == GTK_TEXT_DIR_RTL)
            {
                  flip_child (widget, &(child2_allocation));
                  flip_child (widget, &(child1_allocation));
                  flip_child (widget, &(paned->handle_pos));
            }
      
            if (GTK_WIDGET_REALIZED (widget))
            {
                  if (GTK_WIDGET_MAPPED (widget))
                        gdk_window_show (paned->handle);
                  gdk_window_move_resize (paned->handle,
                                    paned->handle_pos.x,
                                    paned->handle_pos.y,
                                    handle_size,
                                    paned->handle_pos.height);
            }
      
            /* Now allocate the childen, making sure, when resizing not to
             * overlap the windows
             */
            if (GTK_WIDGET_MAPPED (widget) &&
                paned->child1->allocation.width < child1_allocation.width)
            {
                  gtk_widget_size_allocate (paned->child2, &child2_allocation);
                  gtk_widget_size_allocate (paned->child1, &child1_allocation);
            }
            else
            {
                  gtk_widget_size_allocate (paned->child1, &child1_allocation);
                  gtk_widget_size_allocate (paned->child2, &child2_allocation);
            }
      }
      else
      {
            GtkAllocation child_allocation;

            if (GTK_WIDGET_REALIZED (widget))      
                  gdk_window_hide (paned->handle);

            if (paned->child1)
                  gtk_widget_set_child_visible (paned->child1, TRUE);
            if (paned->child2)
                  gtk_widget_set_child_visible (paned->child2, TRUE);

            child_allocation.x = widget->allocation.x + border_width;
            child_allocation.y = widget->allocation.y + border_width;
            child_allocation.width = MAX (1, allocation->width - 2 * border_width);
            child_allocation.height = MAX (1, allocation->height - 2 * border_width);
      
            if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1))
                  gtk_widget_size_allocate (paned->child1, &child_allocation);
            else if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
                  gtk_widget_size_allocate (paned->child2, &child_allocation);
      }
}

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