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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/

/*
* Custom implementation of GtkOverlay
* author: Konstantinov Denis <linvinus@gmail.com>
*
* */

using Gtk;

public class MyOverlayBox : Bin {
private Widget main_widget=null;
private Widget overlay_widget=null;

public MyOverlayBox(){
//this.set_has_window (false);
}

public override void add (Widget w){
if(main_widget==null){
w.set_parent(this);
main_widget=w;
w.show();
}
}

public void add_overlay (Widget w){
if(overlay_widget==null){
w.set_parent(this);
overlay_widget=w;
}
}

public override SizeRequestMode get_request_mode () {
return (Gtk.SizeRequestMode.HEIGHT_FOR_WIDTH);
}

public override void get_preferred_width (out int o_minimum_width, out int o_natural_width) {
var nat = 0;
var min = 0;
if(main_widget!=null)
main_widget.get_preferred_width (out min, out nat);

o_minimum_width=int.max(o_minimum_width,min);
o_natural_width=int.max(o_natural_width,nat);

if(overlay_widget!=null)
overlay_widget.get_preferred_width (out min, out nat);
//~Ignore overlay_widget size
//~ o_minimum_width=int.max(o_minimum_width,min);
//~ o_natural_width=int.max(o_natural_width,nat);
}

public override void get_preferred_height_for_width (int width,out int minimum_height, out int natural_height) {
var nat = 0;
var min = 0;
if(main_widget!=null)
main_widget.get_preferred_height_for_width (width,out min, out nat);

minimum_height=int.max(minimum_height,min);
natural_height=int.max(natural_height,nat);

if(overlay_widget!=null)
overlay_widget.get_preferred_height_for_width (width,out min, out nat);
//~Ignore overlay_widget size
//~ minimum_height=int.max(minimum_height,min);
//~ natural_height=int.max(natural_height,nat);
}

public override void size_allocate (Gtk.Allocation allocation) {
base.size_allocate (allocation);//allocate container it self

if(main_widget!=null)
main_widget.size_allocate(allocation);

if(overlay_widget!=null){
allocation.x+=0;
allocation.y+=0;
//setup same size as main_widget no variants
overlay_widget.set_size_request(allocation.width,allocation.height);
overlay_widget.size_allocate(allocation);
}

}

    public override void forall_internal(bool include_internal,Gtk.Callback callback){
if(main_widget!=null && main_widget.parent==this)
callback(main_widget);
if(overlay_widget!=null && overlay_widget.parent==this)
callback(overlay_widget);
}

public override void remove (Widget widget){
widget.unparent();
}

public override void map () {
//first present overlay_widget , otherwise overlay_widget will be behind main_widget!
if(this.overlay_widget.visible)
this.overlay_widget.map();
base.map();
}

public override void realize () {
debug("realize");

/*var attributes = new Gdk.WindowAttr();
int attributes_mask;
Gtk.Allocation allocation;

this.get_allocation (out allocation);

attributes.window_type = Gdk.WindowType.CHILD;
attributes.wclass = Gdk.WindowWindowClass.OUTPUT;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes_mask = Gdk.WindowAttributesType.X | Gdk.WindowAttributesType.Y;
attributes.event_mask = this.get_events () | Gdk.EventMask.EXPOSURE_MASK;

var window = new Gdk.Window (this.get_window (),
attributes, attributes_mask);

//dialog_vbox.set_window (vtw.get_window());
this.set_window (window);
//this.set_has_window (true);*/

debug("before base realize");
base.realize();
debug("after base realize");

var attributes = Gdk.WindowAttr();
int attributes_mask;
Gtk.Allocation allocation;

overlay_widget.get_allocation (out allocation);

attributes.window_type = Gdk.WindowType.CHILD;
attributes.wclass = Gdk.WindowWindowClass.INPUT_OUTPUT;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes_mask = Gdk.WindowAttributesType.X | Gdk.WindowAttributesType.Y;
attributes.event_mask = overlay_widget.get_events () | Gdk.EventMask.EXPOSURE_MASK;

var window = new Gdk.Window (this.get_window (),
                           attributes, attributes_mask);

//dialog_vbox.set_window (vtw.get_window());
overlay_widget.set_parent_window (window);
overlay_widget.set_has_window (true);
//vtw.overlay_notebook.show_all();
}

}//MyOverlayBox
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