aboutsummaryrefslogtreecommitdiff
path: root/src/ido-detail-label.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/ido-detail-label.c')
-rw-r--r--src/ido-detail-label.c396
1 files changed, 396 insertions, 0 deletions
diff --git a/src/ido-detail-label.c b/src/ido-detail-label.c
new file mode 100644
index 0000000..780a2dd
--- /dev/null
+++ b/src/ido-detail-label.c
@@ -0,0 +1,396 @@
+/*
+ * Copyright 2012 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Lars Uebernickel <lars.uebernickel@canonical.com>
+ */
+
+#include "ido-detail-label.h"
+
+#include <math.h>
+
+G_DEFINE_TYPE (IdoDetailLabel, ido_detail_label, GTK_TYPE_WIDGET)
+
+struct _IdoDetailLabelPrivate
+{
+ gchar *text;
+ PangoLayout *layout;
+ gboolean draw_lozenge;
+};
+
+enum
+{
+ PROP_0,
+ PROP_TEXT,
+ NUM_PROPERTIES
+};
+
+static GParamSpec *properties[NUM_PROPERTIES];
+
+static void
+ido_detail_label_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ IdoDetailLabel *self = IDO_DETAIL_LABEL (object);
+
+ switch (property_id)
+ {
+ case PROP_TEXT:
+ g_value_set_string (value, self->priv->text);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ }
+}
+
+static void
+ido_detail_label_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ IdoDetailLabel *self = IDO_DETAIL_LABEL (object);
+
+ switch (property_id)
+ {
+ case PROP_TEXT:
+ ido_detail_label_set_text (self, g_value_get_string (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ }
+}
+
+
+static void
+ido_detail_label_finalize (GObject *object)
+{
+ IdoDetailLabelPrivate *priv = IDO_DETAIL_LABEL (object)->priv;
+
+ g_free (priv->text);
+
+ G_OBJECT_CLASS (ido_detail_label_parent_class)->finalize (object);
+}
+
+static void
+ido_detail_label_dispose (GObject *object)
+{
+ IdoDetailLabelPrivate *priv = IDO_DETAIL_LABEL (object)->priv;
+
+ g_clear_object (&priv->layout);
+
+ G_OBJECT_CLASS (ido_detail_label_parent_class)->dispose (object);
+}
+
+static void
+ido_detail_label_ensure_layout (IdoDetailLabel *label)
+{
+ IdoDetailLabelPrivate *priv = label->priv;
+
+ if (priv->layout == NULL)
+ {
+ priv->layout = gtk_widget_create_pango_layout (GTK_WIDGET (label), priv->text);
+ pango_layout_set_alignment (priv->layout, PANGO_ALIGN_CENTER);
+ pango_layout_set_ellipsize (priv->layout, PANGO_ELLIPSIZE_END);
+ pango_layout_set_height (priv->layout, -1);
+
+ // TODO update layout on "style-updated" and "direction-changed"
+ }
+}
+
+static void
+cairo_lozenge (cairo_t *cr,
+ double x,
+ double y,
+ double w,
+ double h,
+ double radius)
+{
+ double x1 = x + w - radius;
+ double x2 = x + radius;
+ double y1 = y + radius;
+ double y2 = y + h - radius;
+
+ cairo_move_to (cr, x + radius, y);
+ cairo_arc (cr, x1, y1, radius, G_PI * 1.5, G_PI * 2);
+ cairo_arc (cr, x1, y2, radius, 0, G_PI * 0.5);
+ cairo_arc (cr, x2, y2, radius, G_PI * 0.5, G_PI);
+ cairo_arc (cr, x2, y1, radius, G_PI, G_PI * 1.5);
+}
+
+static PangoFontMetrics *
+gtk_widget_get_font_metrics (GtkWidget *widget,
+ PangoContext *context)
+{
+ const PangoFontDescription *font;
+
+ font = gtk_style_context_get_font (gtk_widget_get_style_context (widget),
+ gtk_widget_get_state_flags (widget));
+
+ return pango_context_get_metrics (context,
+ font,
+ pango_context_get_language (context));
+}
+
+static gint
+ido_detail_label_get_minimum_text_width (IdoDetailLabel *label)
+{
+ IdoDetailLabelPrivate *priv = label->priv;
+ PangoContext *context;
+ PangoFontMetrics *metrics;
+ gint char_width;
+ gint w;
+
+ context = pango_layout_get_context (priv->layout);
+ metrics = gtk_widget_get_font_metrics (GTK_WIDGET (label), context);
+ char_width = pango_font_metrics_get_approximate_digit_width (metrics);
+
+ w = 2 * char_width / PANGO_SCALE;
+ pango_font_metrics_unref (metrics);
+ return w;
+}
+
+static gboolean
+ido_detail_label_draw (GtkWidget *widget,
+ cairo_t *cr)
+{
+ IdoDetailLabel *label = IDO_DETAIL_LABEL (widget);
+ IdoDetailLabelPrivate *priv = IDO_DETAIL_LABEL (widget)->priv;
+ PangoRectangle extents;
+ GtkAllocation allocation;
+ double x, w, h, radius;
+ GdkRGBA color;
+
+ if (!priv->text || !*priv->text)
+ return TRUE;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ ido_detail_label_ensure_layout (IDO_DETAIL_LABEL (widget));
+
+ pango_layout_get_extents (priv->layout, NULL, &extents);
+ pango_extents_to_pixels (&extents, NULL);
+
+ h = MIN (allocation.height, extents.height);
+ radius = floor (h / 2.0);
+ w = MAX (ido_detail_label_get_minimum_text_width (label), extents.width) + 2.0 * radius;
+ x = allocation.width - w;
+
+ pango_layout_set_width (priv->layout, (allocation.width - 2 * radius) * PANGO_SCALE);
+ pango_layout_get_extents (priv->layout, NULL, &extents);
+ pango_extents_to_pixels (&extents, NULL);
+
+ gtk_style_context_get_color (gtk_widget_get_style_context (widget),
+ gtk_widget_get_state_flags (widget),
+ &color);
+ gdk_cairo_set_source_rgba (cr, &color);
+
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+
+ if (priv->draw_lozenge)
+ cairo_lozenge (cr, x, 0.0, w, h, radius);
+
+ cairo_move_to (cr, x + radius, (allocation.height - extents.height) / 2.0);
+ pango_cairo_layout_path (cr, priv->layout);
+ cairo_fill (cr);
+
+ return TRUE;
+}
+
+static void
+ido_detail_label_get_preferred_width (GtkWidget *widget,
+ gint *minimum,
+ gint *natural)
+{
+ IdoDetailLabelPrivate *priv = IDO_DETAIL_LABEL (widget)->priv;
+ PangoRectangle extents;
+ double radius;
+
+ ido_detail_label_ensure_layout (IDO_DETAIL_LABEL (widget));
+
+ pango_layout_get_extents (priv->layout, NULL, &extents);
+ pango_extents_to_pixels (&extents, NULL);
+
+ radius = floor (extents.height / 2.0);
+
+ *minimum = ido_detail_label_get_minimum_text_width (IDO_DETAIL_LABEL (widget)) + 2.0 * radius;
+ *natural = MAX (*minimum, extents.width + 2.0 * radius);
+}
+
+static void
+ido_detail_label_get_preferred_height (GtkWidget *widget,
+ gint *minimum,
+ gint *natural)
+{
+ IdoDetailLabelPrivate *priv = IDO_DETAIL_LABEL (widget)->priv;
+ PangoContext *context;
+ PangoFontMetrics *metrics;
+ PangoRectangle extents;
+
+ ido_detail_label_ensure_layout (IDO_DETAIL_LABEL (widget));
+
+ pango_layout_get_extents (priv->layout, NULL, &extents);
+ pango_extents_to_pixels (&extents, NULL);
+ context = pango_layout_get_context (priv->layout);
+ metrics = gtk_widget_get_font_metrics (widget, context);
+
+ *minimum = *natural = (pango_font_metrics_get_ascent (metrics) +
+ pango_font_metrics_get_descent (metrics)) / PANGO_SCALE;
+
+ pango_font_metrics_unref (metrics);
+}
+
+static void
+ido_detail_label_class_init (IdoDetailLabelClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->get_property = ido_detail_label_get_property;
+ object_class->set_property = ido_detail_label_set_property;
+ object_class->finalize = ido_detail_label_finalize;
+ object_class->dispose = ido_detail_label_dispose;
+
+ widget_class->draw = ido_detail_label_draw;
+ widget_class->get_preferred_width = ido_detail_label_get_preferred_width;
+ widget_class->get_preferred_height = ido_detail_label_get_preferred_height;
+
+ g_type_class_add_private (klass, sizeof (IdoDetailLabelPrivate));
+
+ properties[PROP_TEXT] = g_param_spec_string ("text",
+ "Text",
+ "The text of the label",
+ NULL,
+ G_PARAM_READWRITE |
+ G_PARAM_STATIC_STRINGS);
+
+ g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
+}
+
+static void
+ido_detail_label_init (IdoDetailLabel *self)
+{
+ self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
+ IDO_TYPE_DETAIL_LABEL,
+ IdoDetailLabelPrivate);
+
+ gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
+}
+
+GtkWidget *
+ido_detail_label_new (const gchar *label)
+{
+ return g_object_new (IDO_TYPE_DETAIL_LABEL,
+ "text", label,
+ NULL);
+}
+
+const gchar *
+ido_detail_label_get_text (IdoDetailLabel *label)
+{
+ g_return_val_if_fail (IDO_IS_DETAIL_LABEL (label), NULL);
+ return label->priv->text;
+}
+
+/* collapse_whitespace:
+ * @str: the source string
+ *
+ * Collapses all occurences of consecutive whitespace charactes in @str
+ * into a single space.
+ *
+ * Returns: (transfer full): a newly-allocated string
+ */
+static gchar *
+collapse_whitespace (const gchar *str)
+{
+ GString *result;
+ gboolean in_space = FALSE;
+
+ if (str == NULL)
+ return NULL;
+
+ result = g_string_new ("");
+
+ while (*str)
+ {
+ gunichar c = g_utf8_get_char_validated (str, -1);
+
+ if (c < 0)
+ break;
+
+ if (!g_unichar_isspace (c))
+ {
+ g_string_append_unichar (result, c);
+ in_space = FALSE;
+ }
+ else if (!in_space)
+ {
+ g_string_append_c (result, ' ');
+ in_space = TRUE;
+ }
+
+ str = g_utf8_next_char (str);
+ }
+
+ return g_string_free (result, FALSE);
+}
+
+static void
+ido_detail_label_set_text_impl (IdoDetailLabel *label,
+ const gchar *text,
+ gboolean draw_lozenge)
+{
+ IdoDetailLabelPrivate * priv = label->priv;
+
+ g_clear_object (&priv->layout);
+ g_free (priv->text);
+
+ priv->text = g_strdup (text);
+ priv->draw_lozenge = draw_lozenge;
+
+ g_object_notify_by_pspec (G_OBJECT (label), properties[PROP_TEXT]);
+ gtk_widget_queue_resize (GTK_WIDGET (label));
+}
+
+void
+ido_detail_label_set_text (IdoDetailLabel *label,
+ const gchar *text)
+{
+ gchar *str;
+
+ g_return_if_fail (IDO_IS_DETAIL_LABEL (label));
+
+ str = collapse_whitespace (text);
+ ido_detail_label_set_text_impl (label, str, FALSE);
+ g_free (str);
+}
+
+void
+ido_detail_label_set_count (IdoDetailLabel *label,
+ gint count)
+{
+ gchar *text;
+
+ g_return_if_fail (IDO_IS_DETAIL_LABEL (label));
+
+ text = g_strdup_printf ("%d", count);
+ ido_detail_label_set_text_impl (label, text, TRUE);
+ g_free (text);
+}