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authorXavier Claessens <xclaesse@gmail.com>2007-06-10 16:11:34 +0800
committerXavier Claessens <xclaesse@src.gnome.org>2007-06-10 16:11:34 +0800
commit7011153ce3fa6807677e1df874389085fd5f0971 (patch)
treef9dfdb47920be18911bfd5d9ea84f59c193fa600 /libempathy-gtk
parent3c2e1e9bf949a06a0f772ebef10e1ad57ec8290f (diff)
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Smooth scrolling. Fixes bug #445859 (Raphael Slinckx).
2007-06-10 Xavier Claessens <xclaesse@gmail.com> * libempathy-gtk/gossip-chat-view.c: Smooth scrolling. Fixes bug #445859 (Raphael Slinckx). svn path=/trunk/; revision=143
Diffstat (limited to 'libempathy-gtk')
-rw-r--r--libempathy-gtk/gossip-chat-view.c66
1 files changed, 48 insertions, 18 deletions
diff --git a/libempathy-gtk/gossip-chat-view.c b/libempathy-gtk/gossip-chat-view.c
index 24770f5de..9fea2fbf1 100644
--- a/libempathy-gtk/gossip-chat-view.c
+++ b/libempathy-gtk/gossip-chat-view.c
@@ -57,6 +57,8 @@
#define TIMESTAMP_INTERVAL 300
#define MAX_LINES 800
+#define MAX_SCROLL_TIME 0.4 /* seconds */
+#define SCROLL_DELAY 33 /* milliseconds */
#define GET_PRIV(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GOSSIP_TYPE_CHAT_VIEW, GossipChatViewPriv))
@@ -77,6 +79,8 @@ struct _GossipChatViewPriv {
BlockType last_block_type;
gboolean allow_scrolling;
+ guint scroll_src;
+ GTimer *scroll_time;
gboolean is_group_chat;
GtkTextMark *find_mark_previous;
@@ -343,6 +347,12 @@ chat_view_finalize (GObject *object)
if (priv->last_contact) {
g_object_unref (priv->last_contact);
}
+ if (priv->scroll_time) {
+ g_timer_destroy (priv->scroll_time);
+ }
+ if (priv->scroll_src) {
+ g_source_remove (priv->scroll_src);
+ }
G_OBJECT_CLASS (gossip_chat_view_parent_class)->finalize (object);
}
@@ -1629,13 +1639,38 @@ gossip_chat_view_scroll (GossipChatView *view,
allow_scrolling ? "enabled" : "disabled");
}
+/* Code stolen from pidgin/gtkimhtml.c */
+static gboolean
+chat_view_scroll_cb (GossipChatView *view)
+{
+ GossipChatViewPriv *priv;
+ GtkAdjustment *adj;
+ gdouble max_val;
+
+ priv = GET_PRIV (view);
+ adj = GTK_TEXT_VIEW (view)->vadjustment;
+ max_val = adj->upper - adj->page_size;
+
+ g_return_val_if_fail (priv->scroll_time != NULL, FALSE);
+
+ if (g_timer_elapsed (priv->scroll_time, NULL) > MAX_SCROLL_TIME) {
+ /* time's up. jump to the end and kill the timer */
+ gtk_adjustment_set_value (adj, max_val);
+ g_timer_destroy (priv->scroll_time);
+ priv->scroll_time = NULL;
+ priv->scroll_src = 0;
+ return FALSE;
+ }
+
+ /* scroll by 1/3rd the remaining distance */
+ gtk_adjustment_set_value (adj, gtk_adjustment_get_value (adj) + ((max_val - gtk_adjustment_get_value (adj)) / 3));
+ return TRUE;
+}
+
void
gossip_chat_view_scroll_down (GossipChatView *view)
{
GossipChatViewPriv *priv;
- GtkTextBuffer *buffer;
- GtkTextIter iter;
- GtkTextMark *mark;
g_return_if_fail (GOSSIP_IS_CHAT_VIEW (view));
@@ -1647,22 +1682,17 @@ gossip_chat_view_scroll_down (GossipChatView *view)
gossip_debug (DEBUG_DOMAIN, "Scrolling down");
- buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
-
- gtk_text_buffer_get_end_iter (buffer, &iter);
- mark = gtk_text_buffer_create_mark (buffer,
- NULL,
- &iter,
- FALSE);
-
- gtk_text_view_scroll_to_mark (GTK_TEXT_VIEW (view),
- mark,
- 0.0,
- FALSE,
- 0,
- 0);
+ if (priv->scroll_time) {
+ g_timer_destroy (priv->scroll_time);
+ }
+ if (priv->scroll_src) {
+ g_source_remove (priv->scroll_src);
+ }
- gtk_text_buffer_delete_mark (buffer, mark);
+ priv->scroll_time = g_timer_new();
+ priv->scroll_src = g_timeout_add (SCROLL_DELAY,
+ (GSourceFunc) chat_view_scroll_cb,
+ view);
}
gboolean