1 files changed, 317 insertions, 0 deletions
diff --git a/libmate-desktop/mate-rr-labeler.c b/libmate-desktop/mate-rr-labeler.c
new file mode 100644
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+++ b/libmate-desktop/mate-rr-labeler.c
@@ -0,0 +1,317 @@
+/* mate-rr-labeler.c - Utility to label monitors to identify them
+ * while they are being configured.
+ *
+ * Copyright 2008, Novell, Inc.
+ *
+ * This file is part of the Mate Library.
+ *
+ * The Mate Library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Mate 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with the Mate Library; see the file COPYING.LIB.  If not,
+ * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Federico Mena-Quintero <[email protected]>
+ */
+
+#define MATE_DESKTOP_USE_UNSTABLE_API
+
+#include <config.h>
+#include <glib/gi18n-lib.h>
+#include "libmateui/mate-rr-labeler.h"
+#include <gtk/gtk.h>
+
+struct _MateRRLabeler {
+	GObject parent;
+
+	MateRRConfig *config;
+
+	int num_outputs;
+
+	GdkColor *palette;
+	GtkWidget **windows;
+};
+
+struct _MateRRLabelerClass {
+	GObjectClass parent_class;
+};
+
+G_DEFINE_TYPE (MateRRLabeler, mate_rr_labeler, G_TYPE_OBJECT);
+
+static void mate_rr_labeler_finalize (GObject *object);
+
+static void
+mate_rr_labeler_init (MateRRLabeler *labeler)
+{
+	/* nothing */
+}
+
+static void
+mate_rr_labeler_class_init (MateRRLabelerClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = (GObjectClass *) class;
+
+	object_class->finalize = mate_rr_labeler_finalize;
+}
+
+static void
+mate_rr_labeler_finalize (GObject *object)
+{
+	MateRRLabeler *labeler;
+
+	labeler = MATE_RR_LABELER (object);
+
+	/* We don't destroy the labeler->config (a MateRRConfig*) here; let our
+	 * caller do that instead.
+	 */
+
+	if (labeler->windows != NULL) {
+		mate_rr_labeler_hide (labeler);
+		g_free (labeler->windows);
+		labeler->windows = NULL;
+	}
+
+	g_free (labeler->palette);
+	labeler->palette = NULL;
+
+	G_OBJECT_CLASS (mate_rr_labeler_parent_class)->finalize (object);
+}
+
+static int
+count_outputs (MateRRConfig *config)
+{
+	int i;
+
+	for (i = 0; config->outputs[i] != NULL; i++)
+		;
+
+	return i;
+}
+
+static void
+make_palette (MateRRLabeler *labeler)
+{
+	/* The idea is that we go around an hue color wheel.  We want to start
+	 * at red, go around to green/etc. and stop at blue --- because magenta
+	 * is evil.  Eeeeek, no magenta, please!
+	 *
+	 * Purple would be nice, though.  Remember that we are watered down
+	 * (i.e. low saturation), so that would be like Like berries with cream.
+	 * Mmmmm, berries.
+	 */
+	double start_hue;
+	double end_hue;
+	int i;
+
+	g_assert (labeler->num_outputs > 0);
+
+	labeler->palette = g_new (GdkColor, labeler->num_outputs);
+
+	start_hue = 0.0; /* red */
+	end_hue   = 2.0/3; /* blue */
+
+	for (i = 0; i < labeler->num_outputs; i++) {
+		double h, s, v;
+		double r, g, b;
+
+		h = start_hue + (end_hue - start_hue) / labeler->num_outputs * i;
+		s = 1.0 / 3;
+		v = 1.0;
+
+		gtk_hsv_to_rgb (h, s, v, &r, &g, &b);
+
+		labeler->palette[i].red   = (int) (65535 * r + 0.5);
+		labeler->palette[i].green = (int) (65535 * g + 0.5);
+		labeler->palette[i].blue  = (int) (65535 * b + 0.5);
+	}
+}
+
+#define LABEL_WINDOW_EDGE_THICKNESS 2
+#define LABEL_WINDOW_PADDING 12
+
+static gboolean
+label_window_expose_event_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
+{
+	cairo_t *cr;
+	GdkColor *color;
+	GtkAllocation allocation;
+
+	color = g_object_get_data (G_OBJECT (widget), "color");
+	gtk_widget_get_allocation (widget, &allocation);
+
+	cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+	/* edge outline */
+
+	cairo_set_source_rgb (cr, 0, 0, 0);
+	cairo_rectangle (cr,
+			 LABEL_WINDOW_EDGE_THICKNESS / 2.0,
+			 LABEL_WINDOW_EDGE_THICKNESS / 2.0,
+			 allocation.width - LABEL_WINDOW_EDGE_THICKNESS,
+			 allocation.height - LABEL_WINDOW_EDGE_THICKNESS);
+	cairo_set_line_width (cr, LABEL_WINDOW_EDGE_THICKNESS);
+	cairo_stroke (cr);
+
+	/* fill */
+
+	gdk_cairo_set_source_color (cr, color);
+	cairo_rectangle (cr,
+			 LABEL_WINDOW_EDGE_THICKNESS,
+			 LABEL_WINDOW_EDGE_THICKNESS,
+			 allocation.width - LABEL_WINDOW_EDGE_THICKNESS * 2,
+			 allocation.height - LABEL_WINDOW_EDGE_THICKNESS * 2);
+	cairo_fill (cr);
+
+	cairo_destroy (cr);
+
+	return FALSE;
+}
+
+static GtkWidget *
+create_label_window (MateRRLabeler *labeler, MateOutputInfo *output, GdkColor *color)
+{
+	GtkWidget *window;
+	GtkWidget *widget;
+	char *str;
+	const char *display_name;
+	GdkColor black = { 0, 0, 0, 0 };
+
+	window = gtk_window_new (GTK_WINDOW_POPUP);
+	gtk_widget_set_app_paintable (window, TRUE);
+
+	gtk_container_set_border_width (GTK_CONTAINER (window), LABEL_WINDOW_PADDING + LABEL_WINDOW_EDGE_THICKNESS);
+
+	/* This is semi-dangerous.  The color is part of the labeler->palette
+	 * array.  Note that in mate_rr_labeler_finalize(), we are careful to
+	 * free the palette only after we free the windows.
+	 */
+	g_object_set_data (G_OBJECT (window), "color", color);
+
+	g_signal_connect (window, "expose-event",
+			  G_CALLBACK (label_window_expose_event_cb), labeler);
+
+	if (labeler->config->clone) {
+		/* Keep this string in sync with mate-control-center/capplets/display/xrandr-capplet.c:get_display_name() */
+
+		/* Translators:  this is the feature where what you see on your laptop's
+		 * screen is the same as your external monitor.  Here, "Mirror" is being
+		 * used as an adjective, not as a verb.  For example, the Spanish
+		 * translation could be "Pantallas en Espejo", *not* "Espejar Pantallas".
+		 */
+		display_name = _("Mirror Screens");
+	} else
+		display_name = output->display_name;
+
+	str = g_strdup_printf ("<b>%s</b>", display_name);
+	widget = gtk_label_new (NULL);
+	gtk_label_set_markup (GTK_LABEL (widget), str);
+	g_free (str);
+
+	/* Make the label explicitly black.  We don't want it to follow the
+	 * theme's colors, since the label is always shown against a light
+	 * pastel background.  See bgo#556050
+	 */
+	gtk_widget_modify_fg (widget, gtk_widget_get_state (widget), &black);
+
+	gtk_container_add (GTK_CONTAINER (window), widget);
+
+	/* Should we center this at the top edge of the monitor, instead of using the upper-left corner? */
+	gtk_window_move (GTK_WINDOW (window), output->x, output->y);
+
+	gtk_widget_show_all (window);
+
+	return window;
+}
+
+static void
+create_label_windows (MateRRLabeler *labeler)
+{
+	int i;
+	gboolean created_window_for_clone;
+
+	labeler->windows = g_new (GtkWidget *, labeler->num_outputs);
+
+	created_window_for_clone = FALSE;
+
+	for (i = 0; i < labeler->num_outputs; i++) {
+		if (!created_window_for_clone && labeler->config->outputs[i]->on) {
+			labeler->windows[i] = create_label_window (labeler, labeler->config->outputs[i], labeler->palette + i);
+
+			if (labeler->config->clone)
+				created_window_for_clone = TRUE;
+		} else
+			labeler->windows[i] = NULL;
+	}
+}
+
+static void
+setup_from_config (MateRRLabeler *labeler)
+{
+	labeler->num_outputs = count_outputs (labeler->config);
+
+	make_palette (labeler);
+
+	create_label_windows (labeler);
+}
+
+MateRRLabeler *
+mate_rr_labeler_new (MateRRConfig *config)
+{
+	MateRRLabeler *labeler;
+
+	g_return_val_if_fail (config != NULL, NULL);
+
+	labeler = g_object_new (MATE_TYPE_RR_LABELER, NULL);
+	labeler->config = config;
+
+	setup_from_config (labeler);
+
+	return labeler;
+}
+
+void
+mate_rr_labeler_hide (MateRRLabeler *labeler)
+{
+	int i;
+
+	g_return_if_fail (MATE_IS_RR_LABELER (labeler));
+
+	for (i = 0; i < labeler->num_outputs; i++)
+		if (labeler->windows[i] != NULL) {
+			gtk_widget_destroy (labeler->windows[i]);
+			labeler->windows[i] = NULL;
+		}
+}
+
+void
+mate_rr_labeler_get_color_for_output (MateRRLabeler *labeler, MateOutputInfo *output, GdkColor *color_out)
+{
+	int i;
+
+	g_return_if_fail (MATE_IS_RR_LABELER (labeler));
+	g_return_if_fail (output != NULL);
+	g_return_if_fail (color_out != NULL);
+
+	for (i = 0; i < labeler->num_outputs; i++)
+		if (labeler->config->outputs[i] == output) {
+			*color_out = labeler->palette[i];
+			return;
+		}
+
+	g_warning ("trying to get the color for unknown MateOutputInfo %p; returning magenta!", output);
+
+	color_out->red   = 0xffff;
+	color_out->green = 0;
+	color_out->blue  = 0xffff;
+}