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display: Ensure at least one display is enabled

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When the user has more than two monitors, then they can disable each
monitor separately. If the user creates an invalid configuration because
they disabled the last monitor, then enable a different one immediately.
This commit is contained in:
Benjamin Berg 2019-03-20 15:16:51 +01:00
parent defbcebfab
commit f45dcff81f
1 changed files with 25 additions and 1 deletions
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26
panels/display/cc-display-panel.c
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@ -493,8 +493,32 @@ on_output_enabled_active_changed_cb (CcDisplayPanel *panel)
if (cc_display_monitor_is_active (panel->current_output) == active) if (cc_display_monitor_is_active (panel->current_output) == active)
return; return;
/* Changing the active state requires a UI rebuild. */
cc_display_monitor_set_active (panel->current_output, active); cc_display_monitor_set_active (panel->current_output, active);
/* Prevent the invalid configuration of disabling the last monitor
* by switching on a different one. */
if (config_get_current_type (panel) == CC_DISPLAY_CONFIG_INVALID_NONE)
{
GList *outputs, *l;
outputs = cc_display_config_get_ui_sorted_monitors (panel->current_config);
for (l = outputs; l; l = l->next)
{
CcDisplayMonitor *output = CC_DISPLAY_MONITOR (l->data);
if (output == panel->current_output)
continue;
if (!cc_display_monitor_is_usable (output))
continue;
cc_display_monitor_set_active (output, TRUE);
cc_display_monitor_set_primary (output, TRUE);
break;
}
}
/* Changing the active state requires a UI rebuild. */
rebuild_ui (panel); rebuild_ui (panel);
} }