/*
 * Licensed under the GNU Lesser General Public License Version 3
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the license, or
 * (at your option) any later version.
 *
 * This software 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

// generated automatically - do not change


module gio.AppInfoMonitor;

private import gio.c.functions;
public  import gio.c.types;
private import gobject.ObjectG;
private import gobject.Signals;
private import std.algorithm;


/**
 * #GAppInfoMonitor is a very simple object used for monitoring the app
 * info database for changes (ie: newly installed or removed
 * applications).
 * 
 * Call g_app_info_monitor_get() to get a #GAppInfoMonitor and connect
 * to the "changed" signal.
 * 
 * In the usual case, applications should try to make note of the change
 * (doing things like invalidating caches) but not act on it.  In
 * particular, applications should avoid making calls to #GAppInfo APIs
 * in response to the change signal, deferring these until the time that
 * the data is actually required.  The exception to this case is when
 * application information is actually being displayed on the screen
 * (eg: during a search or when the list of all applications is shown).
 * The reason for this is that changes to the list of installed
 * applications often come in groups (like during system updates) and
 * rescanning the list on every change is pointless and expensive.
 *
 * Since: 2.40
 */
public class AppInfoMonitor : ObjectG
{
	/** the main Gtk struct */
	protected GAppInfoMonitor* gAppInfoMonitor;

	/** Get the main Gtk struct */
	public GAppInfoMonitor* getAppInfoMonitorStruct(bool transferOwnership = false)
	{
		if (transferOwnership)
			ownedRef = false;
		return gAppInfoMonitor;
	}

	/** the main Gtk struct as a void* */
	protected override void* getStruct()
	{
		return cast(void*)gAppInfoMonitor;
	}

	protected override void setStruct(GObject* obj)
	{
		gAppInfoMonitor = cast(GAppInfoMonitor*)obj;
		super.setStruct(obj);
	}

	/**
	 * Sets our main struct and passes it to the parent class.
	 */
	public this (GAppInfoMonitor* gAppInfoMonitor, bool ownedRef = false)
	{
		this.gAppInfoMonitor = gAppInfoMonitor;
		super(cast(GObject*)gAppInfoMonitor, ownedRef);
	}


	/** */
	public static GType getType()
	{
		return g_app_info_monitor_get_type();
	}

	/**
	 * Gets the #GAppInfoMonitor for the current thread-default main
	 * context.
	 *
	 * The #GAppInfoMonitor will emit a "changed" signal in the
	 * thread-default main context whenever the list of installed
	 * applications (as reported by g_app_info_get_all()) may have changed.
	 *
	 * You must only call g_object_unref() on the return value from under
	 * the same main context as you created it.
	 *
	 * Returns: a reference to a #GAppInfoMonitor
	 *
	 * Since: 2.40
	 */
	public static AppInfoMonitor get()
	{
		auto p = g_app_info_monitor_get();

		if(p is null)
		{
			return null;
		}

		return ObjectG.getDObject!(AppInfoMonitor)(cast(GAppInfoMonitor*) p, true);
	}

	protected class OnChangedDelegateWrapper
	{
		static OnChangedDelegateWrapper[] listeners;
		void delegate(AppInfoMonitor) dlg;
		gulong handlerId;

		this(void delegate(AppInfoMonitor) dlg)
		{
			this.dlg = dlg;
			this.listeners ~= this;
		}

		void remove(OnChangedDelegateWrapper source)
		{
			foreach(index, wrapper; listeners)
			{
				if (wrapper.handlerId == source.handlerId)
				{
					listeners[index] = null;
					listeners = std.algorithm.remove(listeners, index);
					break;
				}
			}
		}
	}

	/**
	 * Signal emitted when the app info database for changes (ie: newly installed
	 * or removed applications).
	 */
	gulong addOnChanged(void delegate(AppInfoMonitor) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		auto wrapper = new OnChangedDelegateWrapper(dlg);
		wrapper.handlerId = Signals.connectData(
			this,
			"changed",
			cast(GCallback)&callBackChanged,
			cast(void*)wrapper,
			cast(GClosureNotify)&callBackChangedDestroy,
			connectFlags);
		return wrapper.handlerId;
	}

	extern(C) static void callBackChanged(GAppInfoMonitor* appinfomonitorStruct, OnChangedDelegateWrapper wrapper)
	{
		wrapper.dlg(wrapper.outer);
	}

	extern(C) static void callBackChangedDestroy(OnChangedDelegateWrapper wrapper, GClosure* closure)
	{
		wrapper.remove(wrapper);
	}
}