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/*
Copyright (C) 2018 Christian Dywan <christian@twotoats.de>
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 2.1 of the License, or (at your option) any later version.
See the file COPYING for the full license text.
*/
namespace Midori {
public class Switcher : Gtk.Box {
HashTable<Gtk.Widget, Tally> buttons;
public Gtk.Stack? stack { get; set; }
public bool show_close_buttons { get; protected set; }
construct {
buttons = new HashTable<Gtk.Widget, Tally> (direct_hash, direct_equal);
notify["stack"].connect ((pspec) => {
stack.add.connect ((widget) => {
if (buttons.lookup (widget) == null && widget is Tab) {
var button = new Tally ((Tab)widget);
buttons.insert (widget, button);
button.active = stack.visible_child == widget;
button.clicked.connect (() => {
stack.visible_child = widget;
});
show_close_buttons = buttons.size () > 1;
button.show_close = show_close_buttons;
bind_property ("show-close-buttons", button, "show-close");
add (button);
}
});
stack.notify["visible-child"].connect (visible_child_changed);
stack.remove.connect ((widget) => {
buttons.take (widget).destroy ();
show_close_buttons = buttons.size () > 1;
});
});
}
void visible_child_changed (ParamSpec pspec) {
var button = buttons.lookup (stack.visible_child);
if (button != null) {
foreach (var b in get_children ()) {
((Tally)b).active = (b == button);
if (button.active) {
ensure_child_visible (button);
}
}
}
}
void ensure_child_visible (Tally button) {
// Autoscroll active button into view if needed
var scrolled = (Gtk.ScrolledWindow)get_ancestor (typeof (Gtk.ScrolledWindow));
if (scrolled != null) {
// Schedule an idle so allocation will be set
Idle.add (() => {
var adjustment = scrolled.hadjustment;
Gtk.Allocation alloc;
button.get_allocation (out alloc);
adjustment.clamp_page (alloc.x, alloc.x + alloc.width);
return Source.REMOVE;
});
}
}
}
}
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