EmpathyKludgeLabel is a child of GtkLabel

EmpathyKludgeLabel sets the PangoLayout width to the width of the GtkAllocation.
It then fudges the allocation in the expose to make the alignment work
correctly.

1 files changed, 89 insertions, 0 deletions

diff --git a/libempathy-gtk/empathy-kludge-label.c b/libempathy-gtk/empathy-kludge-label.c
new file mode 100644
index 000000000..f4a29dec2
--- /dev/null
+++ b/libempathy-gtk/empathy-kludge-label.c
@@ -0,0 +1,89 @@
+/* vim: set ts=4 sts=4 sw=4 et: */
+/*
+ * Copyright (C) 2009 Collabora Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors: Davyd Madeley <davyd.madeley@collabora.co.uk>
+ */
+
+#include "empathy-kludge-label.h"
+
+G_DEFINE_TYPE (EmpathyKludgeLabel, empathy_kludge_label, GTK_TYPE_LABEL);
+
+static void
+empathy_kludge_label_size_allocate (GtkWidget     *self,
+                                    GtkAllocation *allocation)
+{
+    PangoLayout *layout;
+
+    GTK_WIDGET_CLASS (empathy_kludge_label_parent_class)->size_allocate (
+            self, allocation);
+
+    /* force the width of the PangoLayout to be the width of the allocation */
+    layout = gtk_label_get_layout (GTK_LABEL (self));
+    pango_layout_set_width (layout, allocation->width * PANGO_SCALE);
+}
+
+static gboolean
+empathy_kludge_label_expose_event (GtkWidget      *self,
+                                   GdkEventExpose *event)
+{
+    PangoLayout *layout;
+    PangoRectangle rect;
+    GtkAllocation real_allocation;
+    gboolean r;
+
+    layout = gtk_label_get_layout (GTK_LABEL (self));
+    pango_layout_get_pixel_extents (layout, NULL, &rect);
+
+    /* this is mind-bendingly evil:
+     * get_layout_location() is going to remove rect.x from the position of the
+     * layout when painting it. This really sucks. We're going to compensate by
+     * adding this value to the allocation.
+     */
+    real_allocation = self->allocation;
+    self->allocation.x += rect.x;
+
+    r = GTK_WIDGET_CLASS (empathy_kludge_label_parent_class)->expose_event (
+            self, event);
+
+    self->allocation = real_allocation;
+
+    return r;
+}
+
+static void
+empathy_kludge_label_class_init (EmpathyKludgeLabelClass *klass)
+{
+    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+    widget_class->size_allocate = empathy_kludge_label_size_allocate;
+    widget_class->expose_event = empathy_kludge_label_expose_event;
+}
+
+static void
+empathy_kludge_label_init (EmpathyKludgeLabel *self)
+{
+}
+
+GtkWidget *
+empathy_kludge_label_new (const char *str)
+{
+    return g_object_new (EMPATHY_TYPE_KLUDGE_LABEL,
+            "label", str,
+            "xalign", 0.,
+            NULL);
+}