139 строки
4.0 KiB
C#
139 строки
4.0 KiB
C#
//
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// MenuBackend.cs
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//
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// Author:
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// Carlos Alberto Cortez <calberto.cortez@gmail.com>
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// Luís Reis <luiscubal@gmail.com>
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// Eric Maupin <ermau@xamarin.com>
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//
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// Copyright (c) 2011 Carlos Alberto Cortez
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// Copyright (c) 2012 Luís Reis
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// Copyright (c) 2012 Xamarin, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System.Collections.Generic;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls.Primitives;
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using System.Windows.Media;
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using Xwt.Backends;
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namespace Xwt.WPFBackend
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{
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public class MenuBackend : Backend, IMenuBackend
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{
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List<MenuItemBackend> items;
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public override void InitializeBackend (object frontend, ApplicationContext context)
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{
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base.InitializeBackend (frontend, context);
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items = new List<MenuItemBackend> ();
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}
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public IList<MenuItemBackend> Items {
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get {
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return items;
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}
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}
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public MenuItemBackend ParentItem {
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get;
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set;
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}
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public WindowBackend ParentWindow {
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get;
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set;
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}
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public void InsertItem (int index, IMenuItemBackend item)
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{
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var itemBackend = (MenuItemBackend)item;
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items.Insert (index, itemBackend);
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if (ParentItem != null && ParentItem.MenuItem != null)
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ParentItem.MenuItem.Items.Insert (index, itemBackend.Item);
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else if (ParentWindow != null)
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ParentWindow.mainMenu.Items.Insert (index, itemBackend.Item);
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else if (this.menu != null)
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this.menu.Items.Insert (index, itemBackend.Item);
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}
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public void RemoveItem (IMenuItemBackend item)
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{
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var itemBackend = (MenuItemBackend)item;
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items.Remove (itemBackend);
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if (ParentItem != null)
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ParentItem.MenuItem.Items.Remove (itemBackend.Item);
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else if (ParentWindow != null)
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ParentWindow.mainMenu.Items.Remove (itemBackend.Item);
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else if (this.menu != null)
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this.menu.Items.Remove (itemBackend.Item);
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}
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public void RemoveFromParentItem ()
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{
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if (ParentItem == null)
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return;
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ParentItem.MenuItem.Items.Clear ();
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ParentItem = null;
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}
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public void Popup ()
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{
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var menu = CreateContextMenu ();
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menu.Placement = PlacementMode.MousePoint;
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menu.IsOpen = true;
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}
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public void Popup (IWidgetBackend widget, double x, double y)
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{
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var menu = CreateContextMenu ();
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menu.PlacementTarget = (UIElement) widget.NativeWidget;
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menu.Placement = PlacementMode.Relative;
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double hratio = 1;
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double vratio = 1;
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PresentationSource source = PresentationSource.FromVisual ((Visual)widget.NativeWidget);
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if (source != null) {
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Matrix m = source.CompositionTarget.TransformToDevice;
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hratio = m.M11;
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vratio = m.M22;
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}
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menu.HorizontalOffset = x * hratio;
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menu.VerticalOffset = y * vratio;
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menu.IsOpen = true;
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}
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private ContextMenu menu;
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internal ContextMenu CreateContextMenu()
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{
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if (this.menu == null) {
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this.menu = new ContextMenu ();
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foreach (var item in Items)
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this.menu.Items.Add (item.Item);
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}
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return menu;
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}
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}
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}
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