249 lines
8.7 KiB
C#
Executable File
249 lines
8.7 KiB
C#
Executable File
/* ElementPickerViewModel.cs
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* part of zaaReloaded2
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*
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* Copyright 2015-2017 Daniel Kraus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using Bovender.Mvvm;
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using Bovender.Mvvm.Messaging;
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using Bovender.Mvvm.ViewModels;
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using System.Collections.ObjectModel;
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using zaaReloaded2.Controller.Elements;
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namespace zaaReloaded2.ViewModels
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{
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/// <summary>
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/// View model that presents a list of zaaReloaded2.Contorller.Elements.ElementBase
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/// classes to choose from. Depending on which constructor is used, this view model
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/// presents either a list of ControlElementBase-derived classes, a list of
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/// FormatElementBase-derived classes, or both.
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/// </summary>
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class ElementPickerViewModel : ViewModelBase
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{
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#region Properties
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/// <summary>
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/// A two-dimensional tree
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/// </summary>
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public IList<CategoryViewModel> Categories { get; private set; }
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/// <summary>
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/// Gets the currently selected element, or null if no element is selected.
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/// </summary>
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/// <remarks>
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/// TODO: Raise PropertyChanged event.
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/// </remarks>
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public ElementViewModel Selected { get; private set; }
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#endregion
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#region Commands
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public DelegatingCommand ChooseElementCommand
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{
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get
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{
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if (_chooseElementCommand == null)
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{
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_chooseElementCommand = new DelegatingCommand(
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param => DoChooseElement(),
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param => CanChooseElement());
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}
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return _chooseElementCommand;
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}
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}
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#endregion
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#region Messages
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/// <summary>
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/// A message that is sent out when an element has been chosen;
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/// the message content is the element's view model with the element
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/// wrapped inside.
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/// </summary>
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public Message<ViewModelMessageContent> ElementChosenMessage
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{
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get
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{
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if (_elementChosenMessage == null)
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{
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_elementChosenMessage = new Message<ViewModelMessageContent>();
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}
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return _elementChosenMessage;
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}
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}
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#endregion
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#region Constructors
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public ElementPickerViewModel(bool allowControlElements)
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{
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Categories = new List<CategoryViewModel>();
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if (allowControlElements)
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{
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AddCategory(
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new CategoryViewModel(
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Properties.Settings.Default.ControlElementLabel,
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new Collection<ViewModelBase>()
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{
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CreateControlElementViewModel(new SelectFirstDay()),
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CreateControlElementViewModel(new SelectLastDay()),
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CreateControlElementViewModel(new SelectEachDay()),
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CreateControlElementViewModel(new TwoColumns()),
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CreateControlElementViewModel(new NextColumn()),
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}
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)
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);
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}
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CreateFormatElementViewModels();
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}
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/// <summary>
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/// Creates a new element picker for control elements only;
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/// the selected ControlElementVieModel will copy the Elements
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/// property from a source view model.
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/// </summary>
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/// <param name="copyFromViewModel">ControlElementViewModel
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/// whose Elements property to copy.</param>
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public ElementPickerViewModel(ControlElementViewModel copyFromViewModel)
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{
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Categories = new List<CategoryViewModel>();
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AddCategory(
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new CategoryViewModel(
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Properties.Settings.Default.ControlElementLabel,
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new Collection<ViewModelBase>()
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{
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CreateControlElementViewModel(new SelectFirstDay(), copyFromViewModel),
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CreateControlElementViewModel(new SelectLastDay(), copyFromViewModel),
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CreateControlElementViewModel(new SelectEachDay(), copyFromViewModel),
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CreateControlElementViewModel(new TwoColumns()),
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CreateControlElementViewModel(new NextColumn()),
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}
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)
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);
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}
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#endregion
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#region Private methods
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void CreateFormatElementViewModels()
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{
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AddCategory(
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new CategoryViewModel(
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Properties.Settings.Default.FormatElementLabel,
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new Collection<ViewModelBase>()
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{
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CreateFormatElementViewModel(new Items()),
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CreateFormatElementViewModel(new CustomText()),
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}
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)
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);
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}
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void AddCategory(CategoryViewModel category)
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{
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category.PropertyChanged += ElementViewModel_PropertyChanged;
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Categories.Add(category);
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}
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/// <summary>
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/// Creates a new ControlElementViewModel that wraps a ControlElementBase
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/// object. The display string of the ControlElementViewModel is taken
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/// from the canonical Label of the control element.
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/// </summary>
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ViewModelBase CreateControlElementViewModel(ControlElementBase element)
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{
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ControlElementViewModel vm = new ControlElementViewModel(element);
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vm.DisplayString = element.Label;
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vm.PropertyChanged += ElementViewModel_PropertyChanged;
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return vm;
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}
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ViewModelBase CreateControlElementViewModel(
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ControlElementBase element, ControlElementViewModel copyFromViewModel)
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{
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ControlElementViewModel vm = new ControlElementViewModel(element, copyFromViewModel);
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vm.DisplayString = element.Label;
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vm.PropertyChanged += ElementViewModel_PropertyChanged;
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return vm;
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}
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/// <summary>
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/// Creates a new FormatElementViewModel that wraps a FormatElementBase
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/// object and has a custom display string. The custom display string
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/// is necessary because format elements do not have a canonical label.
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/// </summary>
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ViewModelBase CreateFormatElementViewModel(FormatElementBase element)
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{
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FormatElementViewModel vm = new FormatElementViewModel(element);
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vm.PropertyChanged += ElementViewModel_PropertyChanged;
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return vm;
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}
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void ElementViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
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{
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// Casting sender as ElementViewModel may result in Null, but this
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// is a desired effect because category headings may be selected
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// in a view, but are not valid ElementViewModels that we could
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// 'choose'. In addition, when an element is selected, another one
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// is deselected, and the event triggers twice, once for the selected
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// element and once for the deselected one.
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ElementViewModel elementVM = sender as ElementViewModel;
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if (elementVM != null && elementVM.IsSelected && e.PropertyName == "IsSelected")
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{
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Selected = elementVM;
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}
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}
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void DoChooseElement()
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{
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if (CanChooseElement())
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{
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ElementChosenMessage.Send(new ViewModelMessageContent(Selected));
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DoCloseView();
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}
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}
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bool CanChooseElement()
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{
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return Selected != null && Selected.IsSelected == true;
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}
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#endregion
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#region Implementation ov ViewModelBase
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public override object RevealModelObject()
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{
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throw new NotImplementedException();
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}
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#endregion
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#region Fields
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DelegatingCommand _chooseElementCommand;
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Message<ViewModelMessageContent> _elementChosenMessage;
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#endregion
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}
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}
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