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DockNotebook.cs
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171 lines (138 loc) · 4.74 KB
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//
// Author:
// Cameron White <[email protected]>
//
// Copyright (c) 2020 Cameron White
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using Pinta.Core;
namespace Pinta.Docking;
public sealed class TabClosedEventArgs (IDockNotebookItem item) : CancelEventArgs
{
public IDockNotebookItem Item { get; } = item;
}
public sealed class TabEventArgs (IDockNotebookItem? item) : EventArgs
{
public IDockNotebookItem? Item { get; } = item;
}
public sealed class DockNotebook : Gtk.Box
{
private readonly Adw.TabView tab_view;
private readonly Adw.TabBar tab_bar;
private readonly HashSet<IDockNotebookItem> items = [];
public DockNotebook ()
{
Adw.TabView tabView = new () {
Vexpand = true,
Valign = Gtk.Align.Fill,
};
tabView.OnClosePage += TabView_OnClosePage;
Adw.TabBar tabBar = new ();
tabBar.SetView (tabView);
tabBar.Autohide = true;
tabBar.AddCssClass (AdwaitaStyles.Inline);
tabBar.ExpandTabs = true;
// --- Initialization (Gtk.Box)
SetOrientation (Gtk.Orientation.Vertical);
Append (tabBar);
Append (tabView);
// --- References to keep
tab_view = tabView;
tab_bar = tabBar;
// --- Further initialization
// Emit an event when the current tab is changed.
Adw.TabView.SelectedPagePropertyDefinition.Notify (tabView, TabView_TabChanged);
}
private void TabView_TabChanged (GObject.Object _, NotifySignalArgs __)
{
Adw.TabPage? page = tab_view.SelectedPage;
IDockNotebookItem? item = FindItemForPage (page);
ActiveTabChanged?.Invoke (this, new TabEventArgs (item));
}
private bool TabView_OnClosePage (Adw.TabView _, Adw.TabView.ClosePageSignalArgs args)
{
// Prompt the user to save unsaved changes before closing.
Adw.TabPage page = args.Page;
IDockNotebookItem item = FindItemForPage (page)!;
TabClosedEventArgs close_args = new (item);
TabClosed?.Invoke (this, close_args);
tab_view.ClosePageFinish (page, !close_args.Cancel);
if (!close_args.Cancel)
items.Remove (item);
// Prevent the default close handler from running.
return Gdk.Constants.EVENT_STOP;
}
/// <summary>
/// Emitted when a tab is closed by the user.
/// </summary>
public event EventHandler<TabClosedEventArgs>? TabClosed;
/// <summary>
/// Emitted when switching to a different tab.
/// </summary>
public event EventHandler<TabEventArgs>? ActiveTabChanged;
/// <summary>
/// The items currently in the notebook.
/// </summary>
public IEnumerable<IDockNotebookItem> Items => items;
/// <summary>
/// Whether to show the tab bar.
/// </summary>
public bool EnableTabs {
get => tab_bar.IsVisible ();
set {
if (value)
tab_bar.Show ();
else
tab_bar.Hide ();
}
}
/// <summary>
/// Returns the active notebook item.
/// </summary>
public IDockNotebookItem? ActiveItem {
get => FindItemForPage (tab_view.SelectedPage);
set => tab_view.SelectedPage = tab_view.GetPage (value!.Widget);
}
/// <summary>
/// Returns the index of the active item.
/// </summary>
public int ActiveItemIndex => tab_view.SelectedPage switch {
null => -1,
var page => tab_view.GetPagePosition (page)
};
public void InsertTab (IDockNotebookItem item, int position)
{
items.Add (item);
Adw.TabPage page = tab_view.Insert (item.Widget, position);
page.Title = item.Label;
// Update the tab's label when the document's title changes.
item.LabelChanged += (o, args) => { page.Title = item.Label; };
}
public void RemoveTab (IDockNotebookItem item)
{
Adw.TabPage page = tab_view.GetPage (item.Widget);
tab_view.ClosePage (page);
items.Remove (item);
}
private IDockNotebookItem? FindItemForPage (Adw.TabPage? page) => items.Where (i => i.Widget == page?.Child).FirstOrDefault ();
}