path: root/widgets/e-paned/e-vpaned.c

/* EPaned - A slightly more advanced paned widget.
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Author: Christopher James Lahey <clahey@helixcode.com>
 *
 * based on GtkPaned from Gtk+.  Gtk+ Copyright notice follows.
 */

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This 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.
 *
 * This 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 this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "e-vpaned.h"

static void     e_vpaned_class_init     (EVPanedClass   *klass);
static void     e_vpaned_init           (EVPaned        *vpaned);
static void     e_vpaned_size_request   (GtkWidget      *widget,
                     GtkRequisition *requisition);
static void     e_vpaned_size_allocate  (GtkWidget      *widget,
                     GtkAllocation  *allocation);
static void     e_vpaned_draw           (GtkWidget      *widget,
                     GdkRectangle   *area);
static void     e_vpaned_xor_line       (EPaned         *paned);
static gboolean e_vpaned_button_press   (GtkWidget      *widget,
                     GdkEventButton *event);
static gboolean e_vpaned_button_release (GtkWidget      *widget,
                     GdkEventButton *event);
static gboolean e_vpaned_motion         (GtkWidget      *widget,
                     GdkEventMotion *event);
static gboolean e_vpaned_handle_shown   (EPaned *paned);

GtkType
e_vpaned_get_type (void)
{
  static GtkType vpaned_type = 0;

  if (!vpaned_type)
    {
      static const GtkTypeInfo vpaned_info =
      {
    "EVPaned",
    sizeof (EVPaned),
    sizeof (EVPanedClass),
    (GtkClassInitFunc) e_vpaned_class_init,
    (GtkObjectInitFunc) e_vpaned_init,
    /* reserved_1 */ NULL,
    /* reserved_2 */ NULL,
    (GtkClassInitFunc) NULL,
      };

      vpaned_type = gtk_type_unique (E_TYPE_PANED, &vpaned_info);
    }

  return vpaned_type;
}

static void
e_vpaned_class_init (EVPanedClass *klass)
{
  GtkWidgetClass *widget_class;
  EPanedClass    *paned_class;

  widget_class = (GtkWidgetClass *) klass;
  paned_class  = E_PANED_CLASS (klass);

  widget_class->size_request = e_vpaned_size_request;
  widget_class->size_allocate = e_vpaned_size_allocate;
  widget_class->draw = e_vpaned_draw;
  widget_class->button_press_event = e_vpaned_button_press;
  widget_class->button_release_event = e_vpaned_button_release;
  widget_class->motion_notify_event = e_vpaned_motion;

  paned_class->handle_shown = e_vpaned_handle_shown;
}

static void
e_vpaned_init (EVPaned *vpaned)
{
  EPaned *paned;

  g_return_if_fail (vpaned != NULL);
  g_return_if_fail (E_IS_PANED (vpaned));

  paned = E_PANED (vpaned);

  paned->cursor_type = GDK_SB_V_DOUBLE_ARROW;
}

GtkWidget *
e_vpaned_new (void)
{
  EVPaned *vpaned;

  vpaned = gtk_type_new (E_TYPE_VPANED);

  return GTK_WIDGET (vpaned);
}

static void
e_vpaned_size_request (GtkWidget      *widget,
               GtkRequisition *requisition)
{
  EPaned *paned;
  GtkRequisition child_requisition;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (E_IS_VPANED (widget));
  g_return_if_fail (requisition != NULL);

  paned = E_PANED (widget);
  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 (e_paned_handle_shown(paned))
    requisition->height += paned->handle_size;
}

static void
e_vpaned_size_allocate (GtkWidget     *widget,
            GtkAllocation *allocation)
{
  EPaned *paned;
  GtkRequisition child1_requisition;
  GtkRequisition child2_requisition;
  GtkAllocation child1_allocation;
  GtkAllocation child2_allocation;
  gint border_width;
  gboolean handle_shown;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (E_IS_VPANED (widget));
  g_return_if_fail (allocation != NULL);
  
  widget->allocation = *allocation;
  paned = E_PANED (widget);
  border_width = GTK_CONTAINER (widget)->border_width;

  if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1))
    gtk_widget_get_child_requisition (paned->child1, &child1_requisition);
  else
    child1_requisition.height = 0;

  if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
    gtk_widget_get_child_requisition (paned->child2, &child2_requisition);
  else
    child2_requisition.height = 0;
    
  e_paned_compute_position (paned,
                  MAX (1, (gint) widget->allocation.height
                   - 2 * border_width),
                  child1_requisition.height,
                  child2_requisition.height);

  /* Move the handle before the children so we don't get extra expose events */

  if (GTK_WIDGET_REALIZED (widget))
    gdk_window_move_resize (widget->window,
                allocation->x, allocation->y,
                allocation->width,
                allocation->height);

  handle_shown = e_paned_handle_shown(paned);
  if (handle_shown)
    {
      paned->handle_xpos = border_width;
      paned->handle_ypos = paned->child1_size + border_width;
      paned->handle_width = MAX (1, (gint) widget->allocation.width - 2 * border_width);
      paned->handle_height = paned->handle_size;

      if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (paned->handle,
                  paned->handle_xpos,
                  paned->handle_ypos,
                  paned->handle_width,
                  paned->handle_size);
      if (paned->handle)
        gdk_window_show(paned->handle);
    }
    }
  else
    {
      if (paned->handle && GTK_WIDGET_REALIZED (widget))
    gdk_window_hide(paned->handle);
    }

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

  if (handle_shown)
    child2_allocation.y = child1_allocation.y + child1_allocation.height + paned->handle_height;
  else
    child2_allocation.y = child1_allocation.y + child1_allocation.height;
  child2_allocation.height = MAX(1, (gint) 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 && GTK_WIDGET_VISIBLE (paned->child1) &&
      paned->child1->allocation.height < child1_allocation.height)
    {
      if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
    gtk_widget_size_allocate(paned->child2, &child2_allocation);
      gtk_widget_size_allocate(paned->child1, &child1_allocation);
    }
  else
    {
      if (paned->child1 && GTK_WIDGET_VISIBLE (paned->child1))
    gtk_widget_size_allocate(paned->child1, &child1_allocation);
      if (paned->child2 && GTK_WIDGET_VISIBLE (paned->child2))
    gtk_widget_size_allocate(paned->child2, &child2_allocation);
    }
}

static void
e_vpaned_draw (GtkWidget    *widget,
         GdkRectangle *area)
{
  EPaned *paned;
  GdkRectangle handle_area, child_area;
  guint16 border_width;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (E_IS_PANED (widget));

  if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget))
    {
      paned = E_PANED (widget);
      border_width = GTK_CONTAINER (paned)->border_width;

      gdk_window_clear_area (widget->window,
                 area->x, area->y, area->width,
                 area->height);

      if (e_paned_handle_shown(paned))
    {
      handle_area.x = paned->handle_xpos;
      handle_area.y = paned->handle_ypos;
      handle_area.width = paned->handle_width;
      handle_area.height = paned->handle_size;

      if (gdk_rectangle_intersect (&handle_area, area, &child_area))
        {
          child_area.x -= paned->handle_xpos;
          child_area.y -= paned->handle_ypos;

          gtk_paint_handle (widget->style,
                paned->handle,
                GTK_STATE_NORMAL,
                GTK_SHADOW_NONE,
                &child_area,
                widget,
                "paned",
                0, 0, -1, -1,
                GTK_ORIENTATION_HORIZONTAL);

        }
    }
      /* Redraw the children
       */
      if (paned->child1 && gtk_widget_intersect (paned->child1, area, &child_area))
    gtk_widget_draw (paned->child1, &child_area);
      if (paned->child2 && gtk_widget_intersect (paned->child2, area, &child_area))
    gtk_widget_draw (paned->child2, &child_area);
    }
}

static void
e_vpaned_xor_line (EPaned *paned)
{
  GtkWidget *widget;
  GdkGCValues values;
  guint16 ypos;

  widget = GTK_WIDGET (paned);

  if (!paned->xor_gc)
    {
      values.function = GDK_INVERT;
      values.subwindow_mode = GDK_INCLUDE_INFERIORS;
      paned->xor_gc = gdk_gc_new_with_values (widget->window,
                          &values,
                          GDK_GC_FUNCTION | GDK_GC_SUBWINDOW);
    }

  gdk_gc_set_line_attributes (paned->xor_gc, 2, GDK_LINE_SOLID,
                  GDK_CAP_NOT_LAST, GDK_JOIN_BEVEL);

  ypos = paned->child1_size
    + GTK_CONTAINER (paned)->border_width + paned->handle_size / 2;

  gdk_draw_line (widget->window, paned->xor_gc,
         0,
         ypos,
         widget->allocation.width - 1,
         ypos);
}

static gboolean
e_vpaned_button_press (GtkWidget      *widget,
             GdkEventButton *event)
{
  EPaned *paned;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (E_IS_PANED (widget), FALSE);

  paned = E_PANED (widget);

  if (!paned->in_drag &&
      (event->window == paned->handle) && (event->button == 1))
    {
      paned->old_child1_size = paned->child1_size;
      paned->in_drag = TRUE;
      /* We need a server grab here, not gtk_grab_add(), since
       * we don't want to pass events on to the widget's children */
      gdk_pointer_grab (paned->handle, FALSE,
            GDK_POINTER_MOTION_HINT_MASK
            | GDK_BUTTON1_MOTION_MASK
            | GDK_BUTTON_RELEASE_MASK, NULL, NULL,
            event->time);
      paned->child1_size = e_paned_quantized_size(paned, paned->child1_size + event->y - paned->handle_size / 2);
      paned->child1_size = CLAMP (paned->child1_size, 0,
                  widget->allocation.height -
                  paned->handle_size -
                  2 * GTK_CONTAINER (paned)->border_width);
      e_vpaned_xor_line(paned);

      return TRUE;
    }

  return FALSE;
}

static gboolean
e_vpaned_button_release (GtkWidget      *widget,
               GdkEventButton *event)
{
  EPaned *paned;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (E_IS_PANED (widget), FALSE);

  paned = E_PANED (widget);

  if (paned->in_drag && (event->button == 1))
    {
      e_vpaned_xor_line (paned);
      paned->in_drag = FALSE;
      paned->position_set = TRUE;
      gdk_pointer_ungrab (event->time);
      gtk_widget_queue_resize (GTK_WIDGET (paned));

      return TRUE;
    }

  return FALSE;
}

static gboolean
e_vpaned_motion (GtkWidget      *widget,
           GdkEventMotion *event)
{
  EPaned *paned;
  gint y;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (E_IS_PANED (widget), FALSE);

  if (event->is_hint || event->window != widget->window)
    gtk_widget_get_pointer (widget, NULL, &y);
  else
    y = event->y;

  paned = E_PANED (widget);

  if (paned->in_drag)
    {
      gint size = y - GTK_CONTAINER(paned)->border_width - paned->handle_size / 2;
      
      e_vpaned_xor_line (paned);
      paned->child1_size = CLAMP (e_paned_quantized_size(paned, size), paned->min_position, paned->max_position);
      e_vpaned_xor_line(paned);
    }

  return TRUE;
}

static gboolean
e_vpaned_handle_shown (EPaned *paned)
{
  return ((paned->child1 && paned->child2) &&
      (GTK_WIDGET_VISIBLE (paned->child1) && GTK_WIDGET_VISIBLE (paned->child2)));
}