libview: Implement AtkHypertext interface

https://bugzilla.gnome.org/show_bug.cgi?id=639403

taken from:
https://git.gnome.org/browse/evince/commit/?h=gnome-3-8&id=6c1d1a2

1 files changed, 260 insertions, 0 deletions

diff --git a/libview/ev-link-accessible.c b/libview/ev-link-accessible.c
new file mode 100644
index 00000000..9e2de642
--- /dev/null
+++ b/libview/ev-link-accessible.c
@@ -0,0 +1,260 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/* this file is part of atril, a mate document viewer
+ *
+ *  Copyright (C) 2013 Carlos Garcia Campos <[email protected]>
+ *
+ * Evince 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.
+ *
+ * Evince 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+
+#include "ev-link-accessible.h"
+#include "ev-view-private.h"
+
+typedef struct _EvHyperlink      EvHyperlink;
+typedef struct _EvHyperlinkClass EvHyperlinkClass;
+
+struct _EvLinkAccessiblePrivate {
+        EvViewAccessible *view;
+        EvLink           *link;
+        EvRectangle       area;
+
+        EvHyperlink      *hyperlink;
+};
+
+struct _EvHyperlink {
+        AtkHyperlink parent;
+
+        EvLinkAccessible *link_impl;
+};
+
+struct _EvHyperlinkClass {
+        AtkHyperlinkClass parent_class;
+};
+
+#define EV_TYPE_HYPERLINK (ev_hyperlink_get_type ())
+#define EV_HYPERLINK(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EV_TYPE_HYPERLINK, EvHyperlink))
+
+static GType ev_hyperlink_get_type              (void);
+
+G_DEFINE_TYPE (EvHyperlink, ev_hyperlink, ATK_TYPE_HYPERLINK)
+
+static gchar *
+ev_hyperlink_get_uri (AtkHyperlink *atk_hyperlink,
+                      gint          i)
+{
+        EvHyperlink             *hyperlink = EV_HYPERLINK (atk_hyperlink);
+        EvLinkAccessiblePrivate *impl_priv;
+        EvLinkAction            *action;
+
+        if (!hyperlink->link_impl)
+                return NULL;
+
+        impl_priv = hyperlink->link_impl->priv;
+        action = ev_link_get_action (impl_priv->link);
+
+        return action ? g_strdup (ev_link_action_get_uri (action)) : NULL;
+}
+
+static gint
+ev_hyperlink_get_n_anchors (AtkHyperlink *atk_hyperlink)
+{
+        return 1;
+}
+
+static gboolean
+ev_hyperlink_is_valid (AtkHyperlink *atk_hyperlink)
+{
+        return TRUE;
+}
+
+static AtkObject *
+ev_hyperlink_get_object (AtkHyperlink *atk_hyperlink,
+                         gint          i)
+{
+        EvHyperlink *hyperlink = EV_HYPERLINK (atk_hyperlink);
+
+        return hyperlink->link_impl ? ATK_OBJECT (hyperlink->link_impl) : NULL;
+}
+
+static gint
+ev_hyperlink_get_start_index (AtkHyperlink *atk_hyperlink)
+{
+        EvHyperlink             *hyperlink = EV_HYPERLINK (atk_hyperlink);
+        EvLinkAccessiblePrivate *impl_priv;
+        GtkWidget               *widget;
+        EvView                  *view;
+        EvRectangle             *areas = NULL;
+        guint                    n_areas = 0;
+        guint                    i;
+
+        if (!hyperlink->link_impl)
+                return -1;
+
+        impl_priv = hyperlink->link_impl->priv;
+        widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (impl_priv->view));
+        if (widget == NULL)
+                /* State is defunct */
+                return -1;
+
+        view = EV_VIEW (widget);
+        if (!view->page_cache)
+                return -1;
+
+        ev_page_cache_get_text_layout (view->page_cache, view->current_page, &areas, &n_areas);
+        if (!areas)
+                return -1;
+
+        for (i = 0; i < n_areas; i++) {
+                EvRectangle *rect = areas + i;
+                gdouble      c_x, c_y;
+
+                c_x = rect->x1 + (rect->x2 - rect->x1) / 2.;
+                c_y = rect->y1 + (rect->y2 - rect->y1) / 2.;
+                if (c_x >= impl_priv->area.x1 && c_x <= impl_priv->area.x2 &&
+                    c_y >= impl_priv->area.y1 && c_y <= impl_priv->area.y2)
+                        return i;
+        }
+
+        return -1;
+}
+
+static gint
+ev_hyperlink_get_end_index (AtkHyperlink *atk_hyperlink)
+{
+        EvHyperlink             *hyperlink = EV_HYPERLINK (atk_hyperlink);
+        EvLinkAccessiblePrivate *impl_priv;
+        GtkWidget               *widget;
+        EvView                  *view;
+        EvRectangle             *areas = NULL;
+        guint                    n_areas = 0;
+        guint                    i;
+
+        if (!hyperlink->link_impl)
+                return -1;
+
+        impl_priv = hyperlink->link_impl->priv;
+        widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (impl_priv->view));
+        if (widget == NULL)
+                /* State is defunct */
+                return -1;
+
+        view = EV_VIEW (widget);
+        if (!view->page_cache)
+                return -1;
+
+        ev_page_cache_get_text_layout (view->page_cache, view->current_page, &areas, &n_areas);
+        if (!areas)
+                return -1;
+
+        for (i = n_areas - 1; i >= 0; i--) {
+                EvRectangle *rect = areas + i;
+                gdouble      c_x, c_y;
+
+                c_x = rect->x1 + (rect->x2 - rect->x1) / 2.;
+                c_y = rect->y1 + (rect->y2 - rect->y1) / 2.;
+                if (c_x >= impl_priv->area.x1 && c_x <= impl_priv->area.x2 &&
+                    c_y >= impl_priv->area.y1 && c_y <= impl_priv->area.y2)
+                        return i;
+        }
+
+        return -1;
+}
+
+static void
+ev_hyperlink_class_init (EvHyperlinkClass *klass)
+{
+        AtkHyperlinkClass *atk_link_class = ATK_HYPERLINK_CLASS (klass);
+
+        atk_link_class->get_uri = ev_hyperlink_get_uri;
+        atk_link_class->get_n_anchors = ev_hyperlink_get_n_anchors;
+        atk_link_class->is_valid = ev_hyperlink_is_valid;
+        atk_link_class->get_object = ev_hyperlink_get_object;
+        atk_link_class->get_start_index = ev_hyperlink_get_start_index;
+        atk_link_class->get_end_index = ev_hyperlink_get_end_index;
+}
+
+static void
+ev_hyperlink_init (EvHyperlink *link)
+{
+}
+
+static void ev_link_accessible_hyperlink_impl_iface_init (AtkHyperlinkImplIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (EvLinkAccessible, ev_link_accessible, ATK_TYPE_OBJECT,
+			 G_IMPLEMENT_INTERFACE (ATK_TYPE_HYPERLINK_IMPL, ev_link_accessible_hyperlink_impl_iface_init))
+
+static void
+ev_link_accessible_finalize (GObject *object)
+{
+        EvLinkAccessible *link = EV_LINK_ACCESSIBLE (object);
+
+        g_clear_object (&link->priv->hyperlink);
+
+        G_OBJECT_CLASS (ev_link_accessible_parent_class)->finalize (object);
+}
+
+static void
+ev_link_accessible_class_init (EvLinkAccessibleClass *klass)
+{
+        GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+        object_class->finalize = ev_link_accessible_finalize;
+
+        g_type_class_add_private (klass, sizeof (EvLinkAccessiblePrivate));
+}
+
+static void
+ev_link_accessible_init (EvLinkAccessible *link)
+{
+        link->priv = G_TYPE_INSTANCE_GET_PRIVATE (link, EV_TYPE_LINK_ACCESSIBLE, EvLinkAccessiblePrivate);
+}
+
+static AtkHyperlink *
+ev_link_accessible_get_hyperlink (AtkHyperlinkImpl *hyperlink_impl)
+{
+        EvLinkAccessible *link = EV_LINK_ACCESSIBLE (hyperlink_impl);
+
+        if (link->priv->hyperlink)
+                return ATK_HYPERLINK (link->priv->hyperlink);
+
+        link->priv->hyperlink = g_object_new (EV_TYPE_HYPERLINK, NULL);
+
+        link->priv->hyperlink->link_impl = link;
+        g_object_add_weak_pointer (G_OBJECT (link), (gpointer *)&link->priv->hyperlink->link_impl);
+
+        return ATK_HYPERLINK (link->priv->hyperlink);
+}
+
+static void
+ev_link_accessible_hyperlink_impl_iface_init (AtkHyperlinkImplIface *iface)
+{
+        iface->get_hyperlink = ev_link_accessible_get_hyperlink;
+}
+
+EvLinkAccessible *
+ev_link_accessible_new (EvViewAccessible *view,
+                        EvLink           *link,
+                        EvRectangle      *area)
+{
+        EvLinkAccessible *atk_link;
+
+        atk_link = g_object_new (EV_TYPE_LINK_ACCESSIBLE, NULL);
+        atk_link->priv->view = view;
+        atk_link->priv->link = g_object_ref (link);
+        atk_link->priv->area = *area;
+
+        return EV_LINK_ACCESSIBLE (atk_link);
+}