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.

diff --git a/libempathy-gtk/empathy-kludge-label.c b/libempathy-gtk/empathy-kludge-label.c
new file mode 100644 (file)
index 0000000..f4a29de
--- /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);
+}

diff --git a/libempathy-gtk/empathy-kludge-label.h b/libempathy-gtk/empathy-kludge-label.h
new file mode 100644 (file)
index 0000000..f2ea1e9
--- /dev/null
+++ b/libempathy-gtk/empathy-kludge-label.h
@@ -0,0 +1,53 @@
+/*
+ * 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>
+ */
+
+#ifndef __EMPATHY_KLUDGE_LABEL_H__
+#define __EMPATHY_KLUDGE_LABEL_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define EMPATHY_TYPE_KLUDGE_LABEL      (empathy_kludge_label_get_type ())
+#define EMPATHY_KLUDGE_LABEL(obj)      (G_TYPE_CHECK_INSTANCE_CAST ((obj), EMPATHY_TYPE_KLUDGE_LABEL, EmpathyKludgeLabel))
+#define EMPATHY_KLUDGE_LABEL_CLASS(obj)        (G_TYPE_CHECK_CLASS_CAST ((obj), EMPATHY_TYPE_KLUDGE_LABEL, EmpathyKludgeLabelClass))
+#define EMPATHY_IS_KLUDGE_LABEL(obj)   (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EMPATHY_TYPE_KLUDGE_LABEL))
+#define EMPATHY_IS_KLUDGE_LABEL_CLASS(obj)     (G_TYPE_CHECK_CLASS_TYPE ((obj), EMPATHY_TYPE_KLUDGE_LABEL))
+#define EMPATHY_KLUDGE_LABEL_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), EMPATHY_TYPE_KLUDGE_LABEL, EmpathyKludgeLabelClass))
+
+typedef struct _EmpathyKludgeLabel EmpathyKludgeLabel;
+typedef struct _EmpathyKludgeLabelClass EmpathyKludgeLabelClass;
+
+struct _EmpathyKludgeLabel
+{
+       GtkLabel parent;
+};
+
+struct _EmpathyKludgeLabelClass
+{
+       GtkLabelClass parent_class;
+};
+
+GType empathy_kludge_label_get_type (void);
+GtkWidget *empathy_kludge_label_new (const char *str);
+
+G_END_DECLS
+
+#endif