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* Copyright 2011 Inclusive Design Research Centre, OCAD University.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* Author: Joseph Scheuhammer <clown@alum.mit.edu>
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#include "zoom-options.h"
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#include <glib/gi18n.h>
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#define WID(w) (GtkWidget *) gtk_builder_get_object (priv->builder, w)
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#define POSITION_MODEL_VALUE_COLUMN 2
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#define FONT_SCALE 1.25
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struct _ZoomOptionsPrivate
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GSettings *application_settings;
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GtkWidget *position_combobox;
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GtkWidget *follow_mouse_radio;
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GtkWidget *screen_part_radio;
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GtkWidget *centered_radio;
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GtkWidget *push_radio;
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GtkWidget *proportional_radio;
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GtkWidget *extend_beyond_checkbox;
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GtkWidget *brightness_slider;
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GtkWidget *contrast_slider;
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G_DEFINE_TYPE (ZoomOptions, zoom_options, G_TYPE_OBJECT);
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static gchar *brightness_keys[] = {
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static gchar *contrast_keys[] = {
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inline void set_active (GtkWidget* toggle, gboolean sense);
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inline gboolean get_active (GtkWidget* toggle);
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inline void set_sensitive (GtkWidget *widget, gboolean sense);
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static void set_enable_screen_part_ui (GtkWidget *widget, ZoomOptionsPrivate *priv);
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static void mouse_tracking_notify_cb (GSettings *settings, const gchar *key, ZoomOptionsPrivate *priv);
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static void scale_label (GtkBin *toggle, PangoAttrList *attrs);
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static void xhairs_color_opacity_changed (GtkColorButton *button, ZoomOptionsPrivate *priv);
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static void xhairs_length_add_marks (GtkScale *scale);
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static void effects_slider_set_value (GtkRange *slider, GSettings *settings);
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static void brightness_slider_notify_cb (GSettings *settings, const gchar *key, ZoomOptionsPrivate *priv);
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static void contrast_slider_notify_cb (GSettings *settings, const gchar *key, ZoomOptionsPrivate *priv);
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static void effects_slider_changed (GtkRange *slider, ZoomOptionsPrivate *priv);
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/* Utilties to save on line length */
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set_active (GtkWidget* toggle, gboolean sense)
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), sense);
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get_active (GtkWidget* toggle)
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return gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (toggle));
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set_sensitive (GtkWidget *widget, gboolean sense)
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gtk_widget_set_sensitive (widget, sense);
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mouse_tracking_radio_toggled_cb (GtkWidget *widget, ZoomOptionsPrivate *priv)
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if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget)) == TRUE)
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g_settings_set_string (priv->settings, "mouse-tracking",
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gtk_buildable_get_name (GTK_BUILDABLE (widget)));
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init_mouse_mode_radio_group (GSList *mode_group, ZoomOptionsPrivate *priv)
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mode = g_settings_get_string (priv->settings, "mouse-tracking");
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for (; mode_group != NULL; mode_group = mode_group->next)
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name = (gchar *) gtk_buildable_get_name (GTK_BUILDABLE (mode_group->data));
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if (g_strcmp0 (name, mode) == 0)
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set_active (GTK_WIDGET (mode_group->data), TRUE);
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set_active (GTK_WIDGET (mode_group->data), FALSE);
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g_signal_connect (G_OBJECT (mode_group->data), "toggled",
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G_CALLBACK(mouse_tracking_radio_toggled_cb),
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init_screen_part_section (ZoomOptionsPrivate *priv, PangoAttrList *pango_attrs)
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GSList *mouse_mode_group;
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priv->follow_mouse_radio = WID ("moveableLens");
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priv->screen_part_radio = WID ("screenPart");
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priv->centered_radio = WID ("centered");
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priv->push_radio = WID ("push");
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priv->proportional_radio = WID ("proportional");
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priv->extend_beyond_checkbox = WID ("scrollAtEdges");
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/* Scale the labels of the toggles */
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scale_label (GTK_BIN(priv->follow_mouse_radio), pango_attrs);
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scale_label (GTK_BIN(priv->screen_part_radio), pango_attrs);
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scale_label (GTK_BIN(priv->centered_radio), pango_attrs);
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scale_label (GTK_BIN(priv->push_radio), pango_attrs);
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scale_label (GTK_BIN(priv->proportional_radio), pango_attrs);
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scale_label (GTK_BIN(priv->extend_beyond_checkbox), pango_attrs);
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lens_mode = g_settings_get_boolean (priv->settings, "lens-mode");
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set_active (priv->follow_mouse_radio, lens_mode);
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set_active (priv->screen_part_radio, !lens_mode);
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mouse_mode_group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (priv->centered_radio));
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init_mouse_mode_radio_group (mouse_mode_group, priv);
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set_enable_screen_part_ui (priv->screen_part_radio, priv);
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g_settings_bind (priv->settings, "lens-mode",
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priv->follow_mouse_radio, "active",
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G_SETTINGS_BIND_DEFAULT);
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g_settings_bind (priv->settings, "scroll-at-edges",
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priv->extend_beyond_checkbox, "active",
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G_SETTINGS_BIND_DEFAULT);
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g_signal_connect (G_OBJECT (priv->screen_part_radio), "toggled",
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G_CALLBACK (set_enable_screen_part_ui), priv);
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g_signal_connect (G_OBJECT (priv->settings), "changed::mouse-tracking",
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G_CALLBACK (mouse_tracking_notify_cb), priv);
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set_enable_screen_part_ui (GtkWidget *widget, ZoomOptionsPrivate *priv)
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gboolean screen_part;
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/* If the "screen part" radio is not checked, then the "follow mouse" radio
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* is checked (== lens mode). Set mouse tracking back to the default.
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screen_part = get_active (priv->screen_part_radio);
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g_settings_set_string (priv->settings,
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"mouse-tracking", "proportional");
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set_sensitive (priv->centered_radio, screen_part);
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set_sensitive (priv->push_radio, screen_part);
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set_sensitive (priv->proportional_radio, screen_part);
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set_sensitive (priv->extend_beyond_checkbox, screen_part);
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mouse_tracking_notify_cb (GSettings *settings,
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ZoomOptionsPrivate *priv)
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tracking = g_settings_get_string (settings, key);
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if (g_strcmp0 (tracking, "proportional") == 0)
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set_active (priv->proportional_radio, TRUE);
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else if (g_strcmp0 (tracking, "centered") == 0)
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set_active (priv->centered_radio, TRUE);
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set_active (priv->push_radio, TRUE);
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scale_label (GtkBin *toggle, PangoAttrList *attrs)
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label = gtk_bin_get_child (toggle);
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gtk_label_set_attributes (GTK_LABEL (label), attrs);
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screen_position_combo_changed_cb (GtkWidget *combobox, ZoomOptions *options)
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ZoomOptionsPrivate *priv = options->priv;
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gchar *combo_value = NULL;
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gtk_combo_box_get_active_iter (GTK_COMBO_BOX (combobox), &iter);
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gtk_tree_model_get (gtk_combo_box_get_model (GTK_COMBO_BOX (combobox)), &iter,
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POSITION_MODEL_VALUE_COLUMN, &combo_value,
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if (g_strcmp0 (combo_value, ""))
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g_settings_set_string (priv->settings, "screen-position", combo_value);
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g_free (combo_value);
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screen_position_notify_cb (GSettings *settings,
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ZoomOptions *options)
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ZoomOptionsPrivate *priv = options->priv;
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GtkComboBox *combobox;
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position = g_settings_get_string (settings, key);
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position = g_settings_get_string (priv->settings, key);
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combobox = GTK_COMBO_BOX (WID ("screen_position_combo_box"));
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model = gtk_combo_box_get_model (combobox);
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/* Find the matching screen position value in the combobox model. If nothing
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* matches, leave the combobox as is.
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valid = gtk_tree_model_get_iter_first (model, &iter);
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gtk_tree_model_get (model, &iter,
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POSITION_MODEL_VALUE_COLUMN, &combo_value,
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if (!g_strcmp0 (combo_value, position))
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g_signal_handlers_block_by_func (combobox, screen_position_combo_changed_cb, priv);
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gtk_combo_box_set_active_iter (combobox, &iter);
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g_signal_handlers_unblock_by_func (combobox, screen_position_combo_changed_cb, priv);
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g_free (combo_value);
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g_free (combo_value);
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valid = gtk_tree_model_iter_next (model, &iter);
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init_xhairs_color_opacity (GtkColorButton *color_button, GSettings *settings)
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gchar *color_setting;
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color_setting = g_settings_get_string (settings, "cross-hairs-color");
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gdk_rgba_parse (&rgba, color_setting);
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rgba.alpha = g_settings_get_double (settings, "cross-hairs-opacity");
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gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (color_button), &rgba);
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xhairs_color_notify_cb (GSettings *settings, gchar *key, GtkColorButton *button)
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init_xhairs_color_opacity (button, settings);
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xhairs_opacity_notify_cb (GSettings *settings, gchar *key, GtkColorButton *button)
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opacity = g_settings_get_double (settings, key);
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gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (button), &rgba);
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rgba.alpha = opacity * 65535;
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gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (button), &rgba);
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#define TO_HEX(x) (int) ((gdouble) x * 255.0)
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xhairs_color_opacity_changed (GtkColorButton *button, ZoomOptionsPrivate *priv)
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gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (button), &rgba);
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color_string = g_strdup_printf ("#%02x%02x%02x",
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g_settings_set_string (priv->settings, "cross-hairs-color", color_string);
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g_free (color_string);
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g_settings_set_double (priv->settings, "cross-hairs-opacity", rgba.alpha);
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static void xhairs_length_add_marks (GtkScale *scale)
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gint length, quarter_length;
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GtkAdjustment *scale_model;
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/* Get maximum dimension of screen */
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length = MAX(gdk_screen_width(), gdk_screen_height());
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scale_model = gtk_range_get_adjustment (GTK_RANGE (scale));
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if (length < gtk_adjustment_get_upper(scale_model))
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gtk_adjustment_set_upper (scale_model, length);
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/* The crosshair is made up of four lines in pairs (top, bottom) and
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(left, right). Stipulating: "quarter of the screen" means that the
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length of one hair is 25% of the screen. */
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quarter_length = length / 4;
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gtk_scale_add_mark (scale, 0, GTK_POS_BOTTOM, C_("Distance", "Short"));
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gtk_scale_add_mark (scale, quarter_length, GTK_POS_BOTTOM, C_("Distance", "Ā¼ Screen"));
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gtk_scale_add_mark (scale, quarter_length * 2 , GTK_POS_BOTTOM, C_("Distance", "Ā½ Screen"));
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gtk_scale_add_mark (scale, quarter_length * 3, GTK_POS_BOTTOM, C_("Distance", "Ā¾ Screen"));
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gtk_scale_add_mark (scale, length, GTK_POS_BOTTOM, C_("Distance", "Long"));
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init_effects_slider (GtkRange *slider,
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ZoomOptionsPrivate *priv,
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g_object_set_data (G_OBJECT (slider), "settings-keys", keys);
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effects_slider_set_value (slider, priv->settings);
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for (key = keys; *key; key++)
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signal = g_strdup_printf ("changed::%s", *key);
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g_signal_connect (G_OBJECT (priv->settings), signal, notify_cb, priv);
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g_signal_connect (G_OBJECT (slider), "value-changed",
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G_CALLBACK (effects_slider_changed),
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gtk_scale_add_mark (GTK_SCALE (slider), 0, GTK_POS_BOTTOM, NULL);
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effects_slider_set_value (GtkRange *slider, GSettings *settings)
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gdouble red, green, blue;
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keys = g_object_get_data (G_OBJECT (slider), "settings-keys");
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red = g_settings_get_double (settings, keys[0]);
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green = g_settings_get_double (settings, keys[1]);
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blue = g_settings_get_double (settings, keys[2]);
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if (red == green && green == blue)
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/* use NTSC conversion weights for reasonable average */
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value = 0.299 * red + 0.587 * green + 0.114 * blue;
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gtk_range_set_value (slider, value);
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brightness_slider_notify_cb (GSettings *settings,
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ZoomOptionsPrivate *priv)
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GtkRange *slider = GTK_RANGE (priv->brightness_slider);
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g_signal_handlers_block_by_func (slider, effects_slider_changed, priv);
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effects_slider_set_value (slider, settings);
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g_signal_handlers_unblock_by_func (slider, effects_slider_changed, priv);
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contrast_slider_notify_cb (GSettings *settings,
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ZoomOptionsPrivate *priv)
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GtkRange *slider = GTK_RANGE (priv->contrast_slider);
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g_signal_handlers_block_by_func (slider, effects_slider_changed, priv);
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effects_slider_set_value (slider, settings);
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g_signal_handlers_unblock_by_func (slider, effects_slider_changed, priv);
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effects_slider_changed (GtkRange *slider, ZoomOptionsPrivate *priv)
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keys = g_object_get_data (G_OBJECT (slider), "settings-keys");
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value = gtk_range_get_value (slider);
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for (key = keys; *key; key++)
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g_settings_set_double (priv->settings, *key, value);
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zoom_option_close_dialog_cb (GtkWidget *closer, ZoomOptionsPrivate *priv)
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if (priv->dialog != NULL)
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gtk_widget_hide (priv->dialog);
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zoom_options_dispose (GObject *object)
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g_return_if_fail (object != NULL);
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g_return_if_fail (ZOOM_IS_OPTIONS (object));
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ZoomOptionsPrivate *priv = ZOOM_OPTIONS (object)->priv;
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g_object_unref (priv->builder);
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priv->builder = NULL;
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g_object_unref (priv->settings);
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priv->settings = NULL;
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g_clear_object (&priv->application_settings);
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gtk_widget_destroy (priv->dialog);
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G_OBJECT_CLASS (zoom_options_parent_class)->dispose (object);
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zoom_options_finalize (GObject *object)
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G_OBJECT_CLASS (zoom_options_parent_class)->finalize (object);
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zoom_options_class_init (ZoomOptionsClass *klass)
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = zoom_options_dispose;
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object_class->finalize = zoom_options_finalize;
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g_type_class_add_private (klass, sizeof (ZoomOptionsPrivate));
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zoom_options_init (ZoomOptions *self)
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ZoomOptionsPrivate *priv;
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PangoAttrList *pango_attrs;
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PangoAttribute *attr;
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priv = self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, ZOOM_TYPE_OPTIONS, ZoomOptionsPrivate);
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priv->builder = gtk_builder_new ();
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gtk_builder_add_from_file (priv->builder,
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GNOMECC_UI_DIR "/zoom-options.ui",
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g_warning ("Could not load interface file: %s", err->message);
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g_object_unref (priv->builder);
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priv->builder = NULL;
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priv->settings = g_settings_new ("org.gnome.desktop.a11y.magnifier");
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priv->application_settings = g_settings_new ("org.gnome.desktop.a11y.applications");
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pango_attrs = pango_attr_list_new ();
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attr = pango_attr_scale_new (FONT_SCALE);
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pango_attr_list_insert (pango_attrs, attr);
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g_settings_bind (priv->application_settings, "screen-magnifier-enabled",
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WID ("seeing_zoom_switch"), "active",
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G_SETTINGS_BIND_DEFAULT);
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/* Magnification factor */
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w = WID ("magFactorSpinButton");
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g_settings_bind (priv->settings, "mag-factor",
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gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (w)),
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"value", G_SETTINGS_BIND_DEFAULT);
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/* Screen position combo */
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w = WID ("screen_position_combo_box");
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screen_position_notify_cb (priv->settings, "screen-position", self);
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g_signal_connect (G_OBJECT (priv->settings), "changed::screen-position",
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G_CALLBACK (screen_position_notify_cb), self);
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g_signal_connect (G_OBJECT (w), "changed",
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G_CALLBACK (screen_position_combo_changed_cb), self);
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/* Screen part section */
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init_screen_part_section (priv, pango_attrs);
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/* Cross hairs: show/hide ... */
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w = WID ("xhairsEnabledSwitch");
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g_settings_bind (priv->settings, "show-cross-hairs", w, "active",
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G_SETTINGS_BIND_DEFAULT);
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/* ... Cross hairs: color and opacity */
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w = WID ("xHairsPicker");
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init_xhairs_color_opacity (GTK_COLOR_BUTTON (w), priv->settings);
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g_signal_connect (G_OBJECT (priv->settings), "changed::cross-hairs-color",
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G_CALLBACK (xhairs_color_notify_cb), w);
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g_signal_connect (G_OBJECT (priv->settings), "changed::cross-hairs-opacity",
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G_CALLBACK (xhairs_opacity_notify_cb), w);
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g_signal_connect (G_OBJECT (w), "color-set",
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G_CALLBACK (xhairs_color_opacity_changed),
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/* ... Cross hairs: thickness ... */
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w = WID ("xHairsThicknessSlider");
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g_settings_bind (priv->settings, "cross-hairs-thickness",
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gtk_range_get_adjustment (GTK_RANGE (w)), "value",
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G_SETTINGS_BIND_DEFAULT);
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/* ... Cross hairs: clip ... */
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w = WID ("xHairsClipCheckbox");
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scale_label (GTK_BIN(w), pango_attrs);
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g_settings_bind (priv->settings, "cross-hairs-clip", w, "active",
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G_SETTINGS_BIND_INVERT_BOOLEAN);
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/* ... Cross hairs: length ... */
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w = WID ("xHairsLengthSlider");
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xhairs_length_add_marks (GTK_SCALE (w));
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g_settings_bind (priv->settings, "cross-hairs-length",
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gtk_range_get_adjustment (GTK_RANGE (w)), "value",
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G_SETTINGS_BIND_DEFAULT);
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/* ... Color effects ... */
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w = WID ("inverseEnabledSwitch");
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g_settings_bind (priv->settings, "invert-lightness", w, "active",
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G_SETTINGS_BIND_DEFAULT);
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w = WID ("brightnessSlider");
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priv->brightness_slider = w;
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init_effects_slider (GTK_RANGE(w), priv, brightness_keys,
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G_CALLBACK (brightness_slider_notify_cb));
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w = WID ("contrastSlider");
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priv->contrast_slider = w;
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init_effects_slider (GTK_RANGE(w), priv, contrast_keys,
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G_CALLBACK (contrast_slider_notify_cb));
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w = WID ("grayscale_slider");
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g_settings_bind (priv->settings, "color-saturation",
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gtk_range_get_adjustment (GTK_RANGE (w)), "value",
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G_SETTINGS_BIND_DEFAULT);
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gtk_scale_add_mark (GTK_SCALE(w), 1.0, GTK_POS_BOTTOM, NULL);
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/* ... Window itself ... */
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priv->dialog = WID ("magPrefsDialog");
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w = WID ("closeButton");
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g_signal_connect (G_OBJECT (w), "clicked",
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G_CALLBACK (zoom_option_close_dialog_cb),
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g_signal_connect (G_OBJECT (priv->dialog), "delete-event",
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G_CALLBACK (gtk_widget_hide_on_delete),
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pango_attr_list_unref (pango_attrs);
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* zoom_options_set_parent:
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* @self: the #ZoomOptions object
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* @parent: the parent #GtkWindow
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* Activate the dialog associated with this ZoomOptions.
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zoom_options_set_parent (ZoomOptions *self,
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g_return_if_fail (ZOOM_IS_OPTIONS (self));
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gtk_window_set_transient_for (GTK_WINDOW (self->priv->dialog), parent);
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gtk_window_set_modal (GTK_WINDOW (self->priv->dialog), TRUE);
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gtk_widget_show (self->priv->dialog);
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zoom_options_new (void)
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return g_object_new (ZOOM_TYPE_OPTIONS, NULL);