//******************************************************************************************************//  PagedViewModelBase.cs - Gbtc////  Copyright © 2012, Grid Protection Alliance.  All Rights Reserved.////  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See//  the NOTICE file distributed with this work for additional information regarding copyright ownership.//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may//  not use this file except in compliance with the License. You may obtain a copy of the License at:////      http://www.opensource.org/licenses/MIT////  Unless agreed to in writing, the subject software distributed under the License is distributed on an//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the//  License for the specific language governing permissions and limitations.////  Code Modification History://  ----------------------------------------------------------------------------------------------------//  04/07/2011 - Mehulbhai P Thakkar//       Generated original version of source code.//  05/13/2011 - Mehulbhai P Thakkar//       Modified CurrentItem.PropertyChanged event handler to virtual so that it can //       be overloaded by the derived classes for special handling such as by Measurements.cs//  05/25/2011 - J. Ritchie Carroll//       Added load/save/delete event operations to allow for user control interception.//  12/20/2012 - Starlynn Danyelle Gilliam//       Modified Header.////****************************************************************************************************** using System;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Collections.Specialized;using System.ComponentModel;using System.Linq;using System.Reflection;using System.Windows;using System.Windows.Controls;using System.Windows.Input;using System.Windows.Threading;using GSF.Data;using GSF.TimeSeries.UI.Commands; namespace GSF.TimeSeries.UI{    /// <summary>    /// Represents an abstract class with paging support which all ViewModel objects derive from.    /// </summary>    public abstract class PagedViewModelBase<TDataModel, TPrimaryKey> : IViewModel where TDataModel : IDataModel, new()    {        #region [ Members ]         // Events         /// <summary>        /// Raised when a property on this object has a new value.        /// </summary>        public event PropertyChangedEventHandler PropertyChanged;         /// <summary>        /// Raised before record load is executed.        /// </summary>        public event CancelEventHandler BeforeLoad;         /// <summary>        /// Raised when record has been loaded.        /// </summary>        public event EventHandler Loaded;         /// <summary>        /// Raised before record save is executed.        /// </summary>        public event CancelEventHandler BeforeSave;         /// <summary>        /// Raised when record has been saved.        /// </summary>        public event EventHandler Saved;         /// <summary>        /// Raised before record delete is executed.        /// </summary>        public event CancelEventHandler BeforeDelete;         /// <summary>        /// Raised when record has been deleted.        /// </summary>        public event EventHandler Deleted;         // Fields        private int m_pageCount, m_currentPageNumber, m_itemsPerPage, m_currentSelectedIndex;        private IList<TPrimaryKey> m_itemsKeys;        private ObservableCollection<TDataModel> m_currentPage, m_itemsSource;        private ObservableCollection<ObservableCollection<TDataModel>> m_pages;        private ICommand m_firstCommand, m_previousCommand, m_nextCommand, m_lastCommand;        private RelayCommand m_saveCommand, m_deleteCommand, m_clearCommand;        private TDataModel m_currentItem;        private bool m_propertyChanged;        private bool m_autoSave;        private bool m_hideMessages;        private readonly DispatcherTimer m_timer;        private readonly TextBlock m_statusTextBlock;        private readonly TsfPopup m_statusPopup;        private Func<TPrimaryKey, object> m_sortSelector;        private string m_sortMember;        private string m_sortDirection;         #endregion         #region [ Constructors ]         /// <summary>        /// Creates a new instance of the <see cref="PagedViewModelBase{T1,T2}"/> class.        /// </summary>        /// <param name="itemsPerPage">Integer value to determine number of items per page.</param>        /// <param name="autoSave">Boolean value to determine is user changes should be saved automatically.</param>        protected PagedViewModelBase(int itemsPerPage, bool autoSave = true)        {            m_itemsPerPage = itemsPerPage;            m_autoSave = autoSave;             Initialize();             if (itemsPerPage > 0)                Load();             m_timer = new DispatcherTimer();            m_timer.Interval = TimeSpan.FromSeconds(5);            m_timer.Tick += m_timer_Tick;             m_statusTextBlock = Application.Current.MainWindow?.FindName("TextBlockResult") as TextBlock;            m_statusPopup = Application.Current.MainWindow?.FindName("PopupStatus") as TsfPopup;        }         #endregion         #region [ Properties ]         /// <summary>        /// Gets or sets current selected index on the UI data grid.        /// </summary>        public int CurrentSelectedIndex        {            get            {                return m_currentSelectedIndex;            }            set            {                m_currentSelectedIndex = value;                OnPropertyChanged("CurrentSelectedIndex");            }        }         /// <summary>        /// Gets or sets flag that determines if current item property has changed.        /// </summary>        public bool CurrentItemPropertyChanged        {            get            {                return m_propertyChanged;            }            set            {                m_propertyChanged = value;            }        }         /// <summary>        /// Gets or sets if user changes should be saved automatically.        /// </summary>        public bool AutoSave        {            get            {                return m_autoSave;            }            set            {                m_autoSave = value;            }        }         /// <summary>        /// Gets a message box to display message to users.        /// </summary>        public Action<string, string, MessageBoxImage> Popup        {            get            {                return (Action<string, string, MessageBoxImage>)((message, caption, messageBoxImage) => MessageBox.Show(Application.Current.MainWindow, message, caption, MessageBoxButton.OK, messageBoxImage));            }        }         /// <summary>        /// Gets message box to request confirmation from users.        /// </summary>        public Func<string, string, bool> Confirm        {            get            {                return (Func<string, string, bool>)((message, caption) => MessageBox.Show(Application.Current.MainWindow, message, caption, MessageBoxButton.YesNo, MessageBoxImage.Question) == MessageBoxResult.Yes);            }        }         /// <summary>        /// Gets or sets number of items to be displayed per page.        /// </summary>        public int ItemsPerPage        {            get            {                return m_itemsPerPage;            }            set            {                m_itemsPerPage = value;            }        }         /// <summary>        /// Gets or sets the collection of primary keys retrieved fromt he database.        /// </summary>        public IList<TPrimaryKey> ItemsKeys        {            get            {                return m_itemsKeys;            }            set            {                m_itemsKeys = value;            }        }         /// <summary>        /// Gets or sets the entire collection retrieved from the database.        /// </summary>        public ObservableCollection<TDataModel> ItemsSource        {            get            {                return m_itemsSource;            }            set            {                m_itemsSource = value;                OnPropertyChanged("ItemsSource");                GeneratePages();            }        }         /// <summary>        /// Gets or sets the current item displayed in a form for edit.        /// </summary>        public TDataModel CurrentItem        {            get            {                return m_currentItem;            }            set            {                if ((object)value != null)                {                    if ((object)m_currentItem != null)                        m_currentItem.PropertyChanged -= m_currentItem_PropertyChanged;                     m_currentItem = value;                     if ((object)m_currentItem != null)                        m_currentItem.PropertyChanged += m_currentItem_PropertyChanged;                     OnPropertyChanged("CurrentItem");                     // If CurrentItem changes then raise OnPropertyChanged on CanDelete property.                    // This will help us display or hide certain item based on IsNewItem property value.                                    OnPropertyChanged("CanDelete");                     // If CurrentItem changes then raise OnPropertyChanged on IsNewRecord property.                    // This will help us enable or disable Initialize button where applicable.                    if ((object)m_currentItem != null)                        OnPropertyChanged("IsNewRecord");                }            }        }         /// <summary>        /// Gets or sets collection displayed on the current page.        /// </summary>        public ObservableCollection<TDataModel> CurrentPage        {            get            {                return m_currentPage;            }            set            {                if (m_currentPage != null)                    m_currentPage.CollectionChanged -= m_currentPage_CollectionChanged;                 m_currentPage = value;                 OnPropertyChanged("CurrentPage");                 if (m_currentPage != null)                {                    m_currentPage.CollectionChanged += m_currentPage_CollectionChanged;                     if (m_currentPage.Count > 0)                    {                        if (CurrentSelectedIndex < 0 || CurrentSelectedIndex >= m_currentPage.Count)                            CurrentSelectedIndex = 0;                         CurrentItem = m_currentPage[CurrentSelectedIndex];                    }                }            }        }         /// <summary>        /// Gets or sets an index of <see cref="CurrentPage"/> to be displayed.        /// </summary>        public int CurrentPageNumber        {            get            {                return m_currentPageNumber;            }            set            {                if (m_currentPageNumber != value)                    CurrentSelectedIndex = 0;                 m_currentPageNumber = Math.Max(Math.Min(value, m_pageCount), 1);                OnPropertyChanged("CurrentPageNumber");                 Load();            }        }         /// <summary>        /// Gets or sets total number of pages.        /// </summary>        public int PageCount        {            get            {                return m_pageCount;            }            set            {                m_pageCount = value;                OnPropertyChanged("PageCount");            }        }         /// <summary>        /// Gets <see cref="ICommand"/> for moving to the first page.        /// </summary>        public ICommand FirstCommand        {            get            {                if (m_firstCommand == null)                {                    m_firstCommand = new RelayCommand                    (                        () =>                        {                            if (m_pages != null)                            {                                CurrentPage = m_pages[0];                                SetCurrentPageNumber(1);                                Load();                            }                         },                        () =>                        {                            return (CurrentPageNumber - 1) < 1 ? false : true;                        }                    );                }                return m_firstCommand;            }        }         /// <summary>        /// Gets <see cref="ICommand"/> for moving to the previous page.        /// </summary>        public ICommand PreviousCommand        {            get            {                if (m_previousCommand == null)                {                    m_previousCommand = new RelayCommand                    (                        () =>                        {                            if (m_pages != null)                            {                                SetCurrentPageNumber((CurrentPageNumber - 1) < 1 ? 1 : CurrentPageNumber - 1);                                CurrentPage = m_pages[CurrentPageNumber - 1];                                Load();                            }                        },                        () =>                        {                            return (CurrentPageNumber - 1) < 1 ? false : true;                        }                    );                }                return m_previousCommand;            }        }         /// <summary>        /// Gets <see cref="ICommand"/> for moving to the next page.        /// </summary>        public ICommand NextCommand        {            get            {                if (m_nextCommand == null)                {                    m_nextCommand = new RelayCommand                    (                        () =>                        {                            if (m_pages != null)                            {                                SetCurrentPageNumber((CurrentPageNumber + 1) > m_pageCount ? m_pageCount : CurrentPageNumber + 1);                                CurrentPage = m_pages[CurrentPageNumber - 1];                                Load();                            }                        },                        () =>                        {                            return (CurrentPageNumber + 1) > m_pageCount ? false : true;                        }                    );                }                return m_nextCommand;            }        }         /// <summary>        /// Gets <see cref="ICommand"/> for moving to the last page.        /// </summary>        public ICommand LastCommand        {            get            {                if (m_lastCommand == null)                {                    m_lastCommand = new RelayCommand                    (                        () =>                        {                            if (m_pages != null)                            {                                CurrentPage = m_pages[m_pageCount - 1];                                SetCurrentPageNumber(m_pageCount);                                Load();                            }                        },                        () =>                        {                            return (CurrentPageNumber + 1) > m_pageCount ? false : true;                        }                    );                }                return m_lastCommand;            }        }         /// <summary>        /// Gets save <see cref="ICommand"/>.        /// </summary>        public ICommand SaveCommand        {            get            {                if (m_saveCommand == null)                    m_saveCommand = new RelayCommand(Save, () => CanSave);                 return m_saveCommand;            }        }         /// <summary>        /// Gets delete <see cref="ICommand"/>.        /// </summary>        public ICommand DeleteCommand        {            get

Lines 1–500 of 1138. Load more