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display: Add a slider to select a monitor's scale when available

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Mutter's new display configuration API allows configurable per-monitor
scales within a finite set determined by mutter. We expose the
available values in a simple slider widget for each monitor.

https://bugzilla.gnome.org/show_bug.cgi?id=782785
This commit is contained in:
Rui Matos 2017-04-11 14:17:27 +02:00
parent 39c6db2772
commit 4b30ecb758
1 changed files with 48 additions and 0 deletions
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48
panels/display/cc-display-panel.c
View file

@ -2011,6 +2011,27 @@ underscan_switch_toggled (CcDisplayPanel *panel)
update_apply_button (panel);
}
static guint
n_supported_scales (CcDisplayConfig *config)
{
const double *scales = cc_display_config_get_supported_scales (config);
guint n = 0;
while (scales[n] != 0.0)
n++;
return n;
}
static void
scale_slider_changed (GtkRange *slider,
CcDisplayPanel *panel)
{
cc_display_monitor_set_scale (panel->priv->current_output,
gtk_range_get_value (slider));
update_apply_button (panel);
}
static void
show_setup_dialog (CcDisplayPanel *panel)
{
@ -2246,6 +2267,33 @@ show_setup_dialog (CcDisplayPanel *panel)
label, "visible", G_BINDING_BIDIRECTIONAL);
grid_pos++;
/* scale */
if (n_supported_scales (priv->current_config) > 1)
{
GtkWidget *slider;
const double *scales = cc_display_config_get_supported_scales (priv->current_config);
guint n = n_supported_scales (priv->current_config);
guint i = 0;
slider = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL,
scales[0], scales[n - 1],
scales[1] - scales[0]);
gtk_scale_set_draw_value (GTK_SCALE (slider), FALSE);
gtk_scale_set_has_origin (GTK_SCALE (slider), FALSE);
for (i = 0; i < n; i++)
{
gchar *s = g_strdup_printf ("%.1lg×", scales[i]);
gtk_scale_add_mark (GTK_SCALE (slider), scales[i], GTK_POS_TOP, s);
g_free (s);
}
gtk_range_set_value (GTK_RANGE (slider), cc_display_monitor_get_scale (priv->current_output));
g_signal_connect (slider, "value-changed", G_CALLBACK (scale_slider_changed), panel);
gtk_grid_attach (GTK_GRID (priv->config_grid), slider, 1, grid_pos, 1, 1);
gtk_widget_set_halign (priv->freq_combo, GTK_ALIGN_CENTER);
grid_pos++;
}
was_clone = clone = cc_display_config_is_cloning (priv->current_config);
primary = cc_display_monitor_is_primary (priv->current_output);
active = cc_display_monitor_is_active (priv->current_output);