/*
 * 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 gtk.Overlay;

private import glib.ConstructionException;
private import gobject.ObjectG;
private import gobject.Signals;
private import gtk.Bin;
private import gtk.Widget;
public  import gtkc.gdktypes;
private import gtkc.gtk;
public  import gtkc.gtktypes;


/**
 * GtkOverlay is a container which contains a single main child, on top
 * of which it can place “overlay” widgets. The
 * position of each overlay widget is determined by its #GtkWidget:halign
 * and #GtkWidget:valign properties. E.g. a widget with both alignments
 * set to %GTK_ALIGN_START will be placed at the top left corner of the
 * main widget, whereas an overlay with halign set to %GTK_ALIGN_CENTER
 * and valign set to %GTK_ALIGN_END will be placed a the bottom edge of
 * the main widget, horizontally centered. The position can be adjusted
 * by setting the margin properties of the child to non-zero values.
 * 
 * More complicated placement of overlays is possible by connecting
 * to the #GtkOverlay::get-child-position signal.
 * 
 * # GtkOverlay as GtkBuildable
 * 
 * The GtkOverlay implementation of the GtkBuildable interface
 * supports placing a child as an overlay by specifying “overlay” as
 * the “type” attribute of a `<child>` element.
 */
public class Overlay : Bin
{
	/** the main Gtk struct */
	protected GtkOverlay* gtkOverlay;

	/** Get the main Gtk struct */
	public GtkOverlay* getOverlayStruct()
	{
		return gtkOverlay;
	}

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

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

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

	/**
	 */

	public static GType getType()
	{
		return gtk_overlay_get_type();
	}

	/**
	 * Creates a new #GtkOverlay.
	 *
	 * Return: a new #GtkOverlay object.
	 *
	 * Since: 3.2
	 *
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this()
	{
		auto p = gtk_overlay_new();
		
		if(p is null)
		{
			throw new ConstructionException("null returned by new");
		}
		
		this(cast(GtkOverlay*) p);
	}

	/**
	 * Adds @widget to @overlay.
	 *
	 * The widget will be stacked on top of the main widget
	 * added with gtk_container_add().
	 *
	 * The position at which @widget is placed is determined
	 * from its #GtkWidget:halign and #GtkWidget:valign properties.
	 *
	 * Params:
	 *     widget = a #GtkWidget to be added to the container
	 *
	 * Since: 3.2
	 */
	public void addOverlay(Widget widget)
	{
		gtk_overlay_add_overlay(gtkOverlay, (widget is null) ? null : widget.getWidgetStruct());
	}

	int[string] connectedSignals;

	bool delegate(Widget, GdkRectangle*, Overlay)[] onGetChildPositionListeners;
	/**
	 * The ::get-child-position signal is emitted to determine
	 * the position and size of any overlay child widgets. A
	 * handler for this signal should fill @allocation with
	 * the desired position and size for @widget, relative to
	 * the 'main' child of @overlay.
	 *
	 * The default handler for this signal uses the @widget's
	 * halign and valign properties to determine the position
	 * and gives the widget its natural size (except that an
	 * alignment of %GTK_ALIGN_FILL will cause the overlay to
	 * be full-width/height). If the main child is a
	 * #GtkScrolledWindow, the overlays are placed relative
	 * to its contents.
	 *
	 * Params:
	 *     widget = the child widget to position
	 *     allocation = return
	 *         location for the allocation
	 *
	 * Return: %TRUE if the @allocation has been filled
	 */
	void addOnGetChildPosition(bool delegate(Widget, GdkRectangle*, Overlay) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		if ( "get-child-position" !in connectedSignals )
		{
			Signals.connectData(
				this,
				"get-child-position",
				cast(GCallback)&callBackGetChildPosition,
				cast(void*)this,
				null,
				connectFlags);
			connectedSignals["get-child-position"] = 1;
		}
		onGetChildPositionListeners ~= dlg;
	}
	extern(C) static int callBackGetChildPosition(GtkOverlay* overlayStruct, GtkWidget* widget, GdkRectangle* allocation, Overlay _overlay)
	{
		foreach ( bool delegate(Widget, GdkRectangle*, Overlay) dlg; _overlay.onGetChildPositionListeners )
		{
			if ( dlg(ObjectG.getDObject!(Widget)(widget), allocation, _overlay) )
			{
				return 1;
			}
		}
		
		return 0;
	}
}