qulogic/talkatu

Change cursors when hovering over a link

2019-07-13, Gary Kramlich
6db3b87f0e8a
Parents ffe4a049963e
Children 23dc31dfa7e8
Change cursors when hovering over a link
1 files changed, 55 insertions(+), 4 deletions(-)
  • +55 -4
    talkatu/talkatuview.c
    • --- a/talkatu/talkatuview.c Sat Jul 13 10:02:45 2019 -0500
    +++ b/talkatu/talkatuview.c Sat Jul 13 11:34:58 2019 -0500
    @@ -57,6 +57,13 @@
    * is updated via cursor-moved and button-press callbacks.
    */
    GtkTextMark *context_mark;
    +
    + /* we chance the cursor that's display while hovering over a link. To
    + * avoid lots of lookups, we also store the tag for links/anchors.
    + */
    + GdkCursor *cursor_text;
    + GdkCursor *cursor_hand;
    + GtkTextTag *tag_anchor;
    } TalkatuViewPrivate;
    enum {
    @@ -221,7 +228,6 @@
    TalkatuViewPrivate *priv = talkatu_view_get_instance_private(TALKATU_VIEW(view));
    GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(view));
    GtkTextTagTable *table = gtk_text_buffer_get_tag_table(buffer);
    - GtkTextTag *anchor = NULL;
    GtkTextIter start;
    if(TALKATU_IS_BUFFER(buffer)) {
    @@ -232,10 +238,11 @@
    priv->context_mark = gtk_text_buffer_create_mark(buffer, NULL, &start, TRUE);
    /* check for the anchor tag, if we have it, add a signal handler to it */
    - anchor = gtk_text_tag_table_lookup(table, TALKATU_TAG_ANCHOR);
    - if(anchor != NULL) {
    + g_clear_pointer(&priv->tag_anchor, g_object_unref);
    + priv->tag_anchor = gtk_text_tag_table_lookup(table, TALKATU_TAG_ANCHOR);
    + if(priv->tag_anchor != NULL) {
    g_signal_connect(
    - anchor,
    + priv->tag_anchor,
    "event",
    G_CALLBACK(talkatu_view_anchor_tag_event_cb),
    NULL
    @@ -379,10 +386,49 @@
    return GTK_WIDGET_CLASS(talkatu_view_parent_class)->query_tooltip(widget, x, y, keyboard, tooltip);
    }
    +static gboolean
    +talkatu_view_motion_notify_event(GtkWidget *widget, GdkEventMotion *event) {
    + TalkatuViewPrivate *priv = talkatu_view_get_instance_private(TALKATU_VIEW(widget));
    + GtkTextIter iter;
    + GdkCursor *cursor = NULL;
    + gint x, y;
    +
    + gtk_text_view_window_to_buffer_coords(
    + GTK_TEXT_VIEW(widget),
    + GTK_TEXT_WINDOW_TEXT,
    + event->x, event->y,
    + &x, &y
    + );
    +
    + gtk_text_view_get_iter_at_location(GTK_TEXT_VIEW(widget), &iter, x, y);
    +
    + if(gtk_text_iter_has_tag(&iter, priv->tag_anchor)) {
    + cursor = priv->cursor_hand;
    + }
    +
    + if(cursor != gdk_window_get_cursor(event->window)) {
    + gdk_window_set_cursor(event->window, cursor);
    +
    + return TRUE;
    + }
    +
    + return GTK_WIDGET_CLASS(talkatu_view_parent_class)->motion_notify_event(widget, event);
    +}
    +
    /******************************************************************************
    * GObject Stuff
    *****************************************************************************/
    static void
    +talkatu_view_finalize(GObject *obj) {
    + TalkatuViewPrivate *priv = talkatu_view_get_instance_private(TALKATU_VIEW(obj));
    +
    + g_object_unref(G_OBJECT(priv->cursor_text));
    + g_object_unref(G_OBJECT(priv->cursor_hand));
    +
    + G_OBJECT_CLASS(talkatu_view_parent_class)->finalize(obj);
    +}
    +
    +static void
    talkatu_view_get_property(GObject *obj, guint prop_id, GValue *value, GParamSpec *pspec) {
    TalkatuView *view = TALKATU_VIEW(obj);
    @@ -414,6 +460,9 @@
    talkatu_view_init(TalkatuView *view) {
    TalkatuViewPrivate *priv = talkatu_view_get_instance_private(view);
    + priv->cursor_text = gdk_cursor_new_from_name(gdk_display_get_default(), "text");
    + priv->cursor_hand = gdk_cursor_new_from_name(gdk_display_get_default(), "pointer");
    +
    /* tell the widest class that we support tooltips. This is used to show
    * link targets, and probably other stuff at some point.
    */
    @@ -457,7 +506,9 @@
    obj_class->get_property = talkatu_view_get_property;
    obj_class->set_property = talkatu_view_set_property;
    + obj_class->finalize = talkatu_view_finalize;
    + widget_class->motion_notify_event = talkatu_view_motion_notify_event;
    widget_class->popup_menu = talkatu_view_popup_menu;
    widget_class->query_tooltip = talkatu_view_query_tooltip;