Indicator: Generalize IndicatorWidget

[ryonakano]

Refactoring. I'm wondering why both IndicatorWidget itself and its users need to be conscious of data type of value and how to set them. I guess state_* properties in IndicatorWidget should be actually represented as a different subclass of it instead.

[stsdc]

Maybe we could put dbusclient closer to the widgets, in the DisplayWidget maybe?

[ryonakano]

@stsdc dbusclient is used both for DisplayWidget and Indicator at the moment as you can see in the following source, so that results both of them watch for the monitor_appeared signal for example. Is this fine for you?

monitor/src/Indicator/Indicator.vala

Lines 26 to 41 in feec4df

	dbusclient = DBusClient.get_default ();
	dbusclient.monitor_vanished.connect (() => this.visible = false);
	dbusclient.monitor_appeared.connect (() => {
	this.visible = settings.get_boolean ("indicator-state");
	display_widget.cpu_widget.visible = settings.get_boolean ("indicator-cpu-state");
	display_widget.cpu_frequency_widget.visible = settings.get_boolean ("indicator-cpu-frequency-state");
	display_widget.cpu_temperature_widget.visible = settings.get_boolean ("indicator-cpu-temperature-state");
	display_widget.memory_widget.visible = settings.get_boolean ("indicator-memory-state");
	display_widget.network_up_widget.visible = settings.get_boolean ("indicator-network-upload-state");
	display_widget.network_down_widget.visible = settings.get_boolean ("indicator-network-download-state");
	display_widget.gpu_widget.visible = settings.get_boolean ("indicator-gpu-state");
	display_widget.gpu_memory_widget.visible = settings.get_boolean ("indicator-gpu-memory-state");
	display_widget.gpu_temperature_widget.visible = settings.get_boolean ("indicator-gpu-temperature-state");
	});

[stsdc]

I would leave dbusclient.monitor_appeared.connect (() => this.visible = true); .
The rest, I would put into display_widget or, if possible, in the specific widgets.