/*
 * This file is part of gtkD.
 *
 * gtkD 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, with
 * some exceptions, please read the COPYING file.
 *
 * gtkD 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 gtkD; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
 */

// generated automatically - do not change
// find conversion definition on APILookup.txt
// implement new conversion functionalities on the wrap.utils pakage


module gdk.DisplayManager;

private import gdk.Display;
private import glib.ListSG;
private import glib.Str;
private import gobject.ObjectG;
private import gobject.Signals;
private import gtkc.gdk;
public  import gtkc.gdktypes;
private import std.algorithm;


/**
 * The purpose of the #GdkDisplayManager singleton object is to offer
 * notification when displays appear or disappear or the default display
 * changes.
 * 
 * You can use gdk_display_manager_get() to obtain the #GdkDisplayManager
 * singleton, but that should be rarely necessary. Typically, initializing
 * GTK+ opens a display that you can work with without ever accessing the
 * #GdkDisplayManager.
 * 
 * The GDK library can be built with support for multiple backends.
 * The #GdkDisplayManager object determines which backend is used
 * at runtime.
 * 
 * When writing backend-specific code that is supposed to work with
 * multiple GDK backends, you have to consider both compile time and
 * runtime. At compile time, use the #GDK_WINDOWING_X11, #GDK_WINDOWING_WIN32
 * macros, etc. to find out which backends are present in the GDK library
 * you are building your application against. At runtime, use type-check
 * macros like GDK_IS_X11_DISPLAY() to find out which backend is in use:
 * 
 * ## Backend-specific code ## {#backend-specific}
 * 
 * |[<!-- language="C" -->
 * #ifdef GDK_WINDOWING_X11
 * if (GDK_IS_X11_DISPLAY (display))
 * {
 * // make X11-specific calls here
 * }
 * else
 * #endif
 * #ifdef GDK_WINDOWING_QUARTZ
 * if (GDK_IS_QUARTZ_DISPLAY (display))
 * {
 * // make Quartz-specific calls here
 * }
 * else
 * #endif
 * g_error ("Unsupported GDK backend");
 * ]|
 */
public class DisplayManager : ObjectG
{
	/** the main Gtk struct */
	protected GdkDisplayManager* gdkDisplayManager;

	/** Get the main Gtk struct */
	public GdkDisplayManager* getDisplayManagerStruct(bool transferOwnership = false)
	{
		if (transferOwnership)
			ownedRef = false;
		return gdkDisplayManager;
	}

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

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

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


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

	/**
	 * Gets the singleton #GdkDisplayManager object.
	 *
	 * When called for the first time, this function consults the
	 * `GDK_BACKEND` environment variable to find out which
	 * of the supported GDK backends to use (in case GDK has been compiled
	 * with multiple backends). Applications can use gdk_set_allowed_backends()
	 * to limit what backends can be used.
	 *
	 * Returns: The global #GdkDisplayManager singleton;
	 *     gdk_parse_args(), gdk_init(), or gdk_init_check() must have
	 *     been called first.
	 *
	 * Since: 2.2
	 */
	public static DisplayManager get()
	{
		auto p = gdk_display_manager_get();
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(DisplayManager)(cast(GdkDisplayManager*) p);
	}

	/**
	 * Gets the default #GdkDisplay.
	 *
	 * Returns: a #GdkDisplay, or %NULL if
	 *     there is no default display.
	 *
	 * Since: 2.2
	 */
	public Display getDefaultDisplay()
	{
		auto p = gdk_display_manager_get_default_display(gdkDisplayManager);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Display)(cast(GdkDisplay*) p);
	}

	/**
	 * List all currently open displays.
	 *
	 * Returns: a newly
	 *     allocated #GSList of #GdkDisplay objects. Free with g_slist_free()
	 *     when you are done with it.
	 *
	 * Since: 2.2
	 */
	public ListSG listDisplays()
	{
		auto p = gdk_display_manager_list_displays(gdkDisplayManager);
		
		if(p is null)
		{
			return null;
		}
		
		return new ListSG(cast(GSList*) p);
	}

	/**
	 * Opens a display.
	 *
	 * Params:
	 *     name = the name of the display to open
	 *
	 * Returns: a #GdkDisplay, or %NULL if the
	 *     display could not be opened
	 *
	 * Since: 3.0
	 */
	public Display openDisplay(string name)
	{
		auto p = gdk_display_manager_open_display(gdkDisplayManager, Str.toStringz(name));
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Display)(cast(GdkDisplay*) p);
	}

	/**
	 * Sets @display as the default display.
	 *
	 * Params:
	 *     display = a #GdkDisplay
	 *
	 * Since: 2.2
	 */
	public void setDefaultDisplay(Display display)
	{
		gdk_display_manager_set_default_display(gdkDisplayManager, (display is null) ? null : display.getDisplayStruct());
	}

	protected class OnDisplayOpenedDelegateWrapper
	{
		static OnDisplayOpenedDelegateWrapper[] listeners;
		void delegate(Display, DisplayManager) dlg;
		gulong handlerId;
		
		this(void delegate(Display, DisplayManager) dlg)
		{
			this.dlg = dlg;
			this.listeners ~= this;
		}
		
		void remove(OnDisplayOpenedDelegateWrapper source)
		{
			foreach(index, wrapper; listeners)
			{
				if (wrapper.handlerId == source.handlerId)
				{
					listeners[index] = null;
					listeners = std.algorithm.remove(listeners, index);
					break;
				}
			}
		}
	}

	/**
	 * The ::display-opened signal is emitted when a display is opened.
	 *
	 * Params:
	 *     display = the opened display
	 *
	 * Since: 2.2
	 */
	gulong addOnDisplayOpened(void delegate(Display, DisplayManager) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		auto wrapper = new OnDisplayOpenedDelegateWrapper(dlg);
		wrapper.handlerId = Signals.connectData(
			this,
			"display-opened",
			cast(GCallback)&callBackDisplayOpened,
			cast(void*)wrapper,
			cast(GClosureNotify)&callBackDisplayOpenedDestroy,
			connectFlags);
		return wrapper.handlerId;
	}
	
	extern(C) static void callBackDisplayOpened(GdkDisplayManager* displaymanagerStruct, GdkDisplay* display, OnDisplayOpenedDelegateWrapper wrapper)
	{
		wrapper.dlg(ObjectG.getDObject!(Display)(display), wrapper.outer);
	}
	
	extern(C) static void callBackDisplayOpenedDestroy(OnDisplayOpenedDelegateWrapper wrapper, GClosure* closure)
	{
		wrapper.remove(wrapper);
	}
}