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-rw-r--r--lib/src/sugar-push-scroller.c195
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diff --git a/lib/src/sugar-push-scroller.c b/lib/src/sugar-push-scroller.c
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+/*
+ * Copyright © 2002 Ricardo Fernádez Pascual
+ * Copyright © 2005 Crispin Flowerday
+ * Copyright © 2005 Christian Persch
+ * Copyright © 2005 Samuel Abels
+ * Copyright (C) 2006, Red Hat, Inc.
+ *
+ * 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.
+ *
+ * $Id: ephy-push-scroller.c,v 1.6 2006/09/13 19:01:24 chpe Exp $
+ */
+
+/* this file is based on work of Daniel Erat for galeon 1 */
+
+#include "sugar-push-scroller.h"
+
+#include <gtk/gtkimage.h>
+#include <gtk/gtkwindow.h>
+#include <gtk/gtkmain.h>
+
+#include <stdlib.h>
+
+#define SUGAR_PUSH_SCROLLER_GET_PRIVATE(object) (G_TYPE_INSTANCE_GET_PRIVATE ((object), SUGAR_TYPE_PUSH_SCROLLER, SugarPushScrollerPrivate))
+
+struct _SugarPushScrollerPrivate
+{
+ SugarBrowser *browser;
+ GdkCursor *cursor;
+ guint start_x;
+ guint start_y;
+ guint active : 1;
+};
+
+G_DEFINE_TYPE(SugarPushScroller, sugar_push_scroller, G_TYPE_OBJECT)
+
+/* private functions */
+
+static gboolean
+sugar_push_scroller_motion_cb(GtkWidget *widget,
+ GdkEventMotion *event,
+ SugarPushScroller *scroller)
+{
+ SugarPushScrollerPrivate *priv = scroller->priv;
+ int x_dist, x_dist_abs, y_dist, y_dist_abs;
+
+ if (!priv->active) {
+ return FALSE;
+ }
+
+ /* get distance between last known cursor position and cursor */
+ x_dist = priv->start_x - event->x_root;
+ x_dist_abs = abs(x_dist);
+ y_dist = priv->start_y - event->y_root;
+ y_dist_abs = abs(y_dist);
+
+ /* scroll */
+ sugar_browser_scroll_pixels(priv->browser, x_dist, y_dist);
+
+ priv->start_x = event->x_root;
+ priv->start_y = event->y_root;
+
+ return TRUE;
+}
+
+/* public functions */
+
+void
+sugar_push_scroller_start (SugarPushScroller *scroller,
+ SugarBrowser *browser,
+ int x,
+ int y)
+{
+ SugarPushScrollerPrivate *priv = scroller->priv;
+ GtkWidget *widget, *window;
+ guint32 timestamp;
+
+ g_return_if_fail (browser != NULL);
+
+ if (priv->active)
+ return;
+
+ if (gdk_pointer_is_grabbed ())
+ return;
+
+ priv->active = TRUE;
+
+ /* FIXME is this good enough? */
+ timestamp = gtk_get_current_event_time();
+
+ g_object_ref (scroller);
+
+ priv->browser = browser;
+
+ window = gtk_widget_get_toplevel(GTK_WIDGET(browser));
+ g_object_ref (window);
+
+ /* set positions */
+ priv->start_x = x;
+ priv->start_y = y;
+
+ g_signal_connect(window, "motion-notify-event",
+ G_CALLBACK (sugar_push_scroller_motion_cb), scroller);
+
+ /* grab the pointer */
+ widget = GTK_WIDGET(window);
+ gtk_grab_add(widget);
+ if (gdk_pointer_grab(widget->window, FALSE,
+ GDK_POINTER_MOTION_MASK |
+ GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK,
+ NULL, priv->cursor, timestamp) != GDK_GRAB_SUCCESS) {
+ sugar_push_scroller_stop(scroller, timestamp);
+ return;
+ }
+}
+
+void
+sugar_push_scroller_stop (SugarPushScroller *scroller,
+ guint32 timestamp)
+{
+ SugarPushScrollerPrivate *priv = scroller->priv;
+ GtkWidget *widget, *window;
+
+ if (priv->active == FALSE)
+ return;
+
+ window = gtk_widget_get_toplevel(GTK_WIDGET(priv->browser));
+
+ /* disconnect the signals before ungrabbing! */
+ g_signal_handlers_disconnect_matched (window,
+ G_SIGNAL_MATCH_DATA, 0, 0,
+ NULL, NULL, scroller);
+
+ /* ungrab the pointer if it's grabbed */
+ if (gdk_pointer_is_grabbed())
+ {
+ gdk_pointer_ungrab(timestamp);
+ }
+
+ gdk_keyboard_ungrab(timestamp);
+
+ widget = GTK_WIDGET(window);
+ gtk_grab_remove(widget);
+
+ g_object_unref(window);
+
+ priv->browser = NULL;
+ priv->active = FALSE;
+
+ g_object_unref(scroller);
+}
+
+/* class implementation */
+
+static void
+sugar_push_scroller_init (SugarPushScroller *scroller)
+{
+ SugarPushScrollerPrivate *priv;
+ priv = scroller->priv = SUGAR_PUSH_SCROLLER_GET_PRIVATE(scroller);
+ priv->active = FALSE;
+ priv->cursor = gdk_cursor_new(GDK_FLEUR);
+}
+
+static void
+sugar_push_scroller_finalize (GObject *object)
+{
+ SugarPushScroller *scroller = SUGAR_PUSH_SCROLLER(object);
+ SugarPushScrollerPrivate *priv = scroller->priv;
+
+ gdk_cursor_unref(priv->cursor);
+
+ G_OBJECT_CLASS(sugar_push_scroller_parent_class)->finalize(object);
+}
+
+static void
+sugar_push_scroller_class_init (SugarPushScrollerClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS(klass);
+
+ object_class->finalize = sugar_push_scroller_finalize;
+
+ g_type_class_add_private(klass, sizeof (SugarPushScrollerPrivate));
+}