Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridState.cs / 1 / DataGridState.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System.Diagnostics; using System; using System.Text; using System.Runtime.InteropServices; using System.Windows.Forms; using System.ComponentModel; using System.Drawing; using Microsoft.Win32; using System.Security.Permissions; ////// /// Encapsulates the state of a DataGrid that changes when the /// user navigates back and forth through ADO.NET data relations. /// internal sealed class DataGridState : ICloneable { // fields // public object DataSource = null; public string DataMember = null; public CurrencyManager ListManager = null; public DataGridRow[] DataGridRows = new DataGridRow[0]; public DataGrid DataGrid; public int DataGridRowsLength = 0; public GridColumnStylesCollection GridColumnStyles = null; public int FirstVisibleRow = 0; public int FirstVisibleCol = 0; public int CurrentRow = 0; public int CurrentCol = 0; public DataGridRow LinkingRow = null; AccessibleObject parentRowAccessibleObject; public DataGridState() { } public DataGridState(DataGrid dataGrid) { PushState(dataGrid); } internal AccessibleObject ParentRowAccessibleObject { get { if (parentRowAccessibleObject == null) { parentRowAccessibleObject = new DataGridStateParentRowAccessibleObject(this); } return parentRowAccessibleObject; } } // methods // public object Clone() { DataGridState dgs = new DataGridState(); dgs.DataGridRows = DataGridRows; dgs.DataSource = DataSource; dgs.DataMember = DataMember; dgs.FirstVisibleRow = FirstVisibleRow; dgs.FirstVisibleCol = FirstVisibleCol; dgs.CurrentRow = CurrentRow; dgs.CurrentCol = CurrentCol; dgs.GridColumnStyles = GridColumnStyles; dgs.ListManager = ListManager; dgs.DataGrid = DataGrid; return dgs; } ////// /// Called by a DataGrid when it wishes to preserve its /// transient state in the current DataGridState object. /// public void PushState(DataGrid dataGrid) { this.DataSource = dataGrid.DataSource; this.DataMember = dataGrid.DataMember; this.DataGrid = dataGrid; this.DataGridRows = dataGrid.DataGridRows; this.DataGridRowsLength = dataGrid.DataGridRowsLength; this.FirstVisibleRow = dataGrid.firstVisibleRow; this.FirstVisibleCol = dataGrid.firstVisibleCol; this.CurrentRow = dataGrid.currentRow; this.GridColumnStyles = new GridColumnStylesCollection(dataGrid.myGridTable); this.GridColumnStyles.Clear(); foreach(DataGridColumnStyle style in dataGrid.myGridTable.GridColumnStyles) { this.GridColumnStyles.Add(style); } this.ListManager = dataGrid.ListManager; this.ListManager.ItemChanged += new ItemChangedEventHandler(DataSource_Changed); this.ListManager.MetaDataChanged += new EventHandler(DataSource_MetaDataChanged); this.CurrentCol = dataGrid.currentCol; } // this is needed so that the parent rows will remove notification from the list // when the datagridstate is no longer needed; public void RemoveChangeNotification() { this.ListManager.ItemChanged -= new ItemChangedEventHandler(DataSource_Changed); this.ListManager.MetaDataChanged -= new EventHandler(DataSource_MetaDataChanged); } ////// /// Called by a grid when it wishes to match its transient /// state with the current DataGridState object. /// public void PullState(DataGrid dataGrid, bool createColumn) { // dataGrid.DataSource = DataSource; // dataGrid.DataMember = DataMember; dataGrid.Set_ListManager(DataSource, DataMember, true, createColumn); // true for forcing new listManager, /* if (DataSource.Table.ParentRelations.Count > 0) dataGrid.PopulateColumns(); */ dataGrid.firstVisibleRow = FirstVisibleRow; dataGrid.firstVisibleCol = FirstVisibleCol; dataGrid.currentRow = CurrentRow; dataGrid.currentCol = CurrentCol; dataGrid.SetDataGridRows(DataGridRows, DataGridRowsLength); } private void DataSource_Changed(object sender, ItemChangedEventArgs e) { if (this.DataGrid != null && this.ListManager.Position == e.Index) { DataGrid.InvalidateParentRows(); return; } if (this.DataGrid != null) DataGrid.ParentRowsDataChanged(); } private void DataSource_MetaDataChanged(object sender, EventArgs e) { if (this.DataGrid != null) DataGrid.ParentRowsDataChanged(); } [ComVisible(true)] internal class DataGridStateParentRowAccessibleObject : AccessibleObject { DataGridState owner = null; public DataGridStateParentRowAccessibleObject(DataGridState owner) : base() { Debug.Assert(owner != null, "DataGridRowAccessibleObject must have a valid owner DataGridRow"); this.owner = owner; } public override Rectangle Bounds { get { DataGridParentRows dataGridParentRows = ((DataGridParentRows.DataGridParentRowsAccessibleObject)this.Parent).Owner; DataGrid g = owner.LinkingRow.DataGrid; Rectangle r = dataGridParentRows.GetBoundsForDataGridStateAccesibility(owner); r.Y += g.ParentRowsBounds.Y; return g.RectangleToScreen(r); } } public override string Name { get { return SR.GetString(SR.AccDGParentRow); } } public override AccessibleObject Parent { [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] get { return owner.LinkingRow.DataGrid.ParentRowsAccessibleObject; } } public override AccessibleRole Role { get { return AccessibleRole.ListItem; } } public override string Value { [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] get { StringBuilder sb = new StringBuilder(); CurrencyManager source = (CurrencyManager)owner.LinkingRow.DataGrid.BindingContext[owner.DataSource, owner.DataMember]; sb.Append(owner.ListManager.GetListName()); sb.Append(": "); bool needComma = false; foreach (DataGridColumnStyle col in owner.GridColumnStyles) { if (needComma) { sb.Append(", "); } string colName = col.HeaderText; string cellValue = col.PropertyDescriptor.Converter.ConvertToString(col.PropertyDescriptor.GetValue(source.Current)); sb.Append(colName); sb.Append(": "); sb.Append(cellValue); needComma = true; } return sb.ToString(); } } ////// /// Navigate to the next or previous grid entry. /// [SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)] public override AccessibleObject Navigate(AccessibleNavigation navdir) { DataGridParentRows.DataGridParentRowsAccessibleObject parentAcc = (DataGridParentRows.DataGridParentRowsAccessibleObject)Parent; switch (navdir) { case AccessibleNavigation.Down: case AccessibleNavigation.Right: case AccessibleNavigation.Next: return parentAcc.GetNext(this); case AccessibleNavigation.Up: case AccessibleNavigation.Left: case AccessibleNavigation.Previous: return parentAcc.GetPrev(this); } return null; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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