Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / Primitives / DataGridRowsPresenter.cs / 1305600 / DataGridRowsPresenter.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Threading; using MS.Internal; namespace System.Windows.Controls.Primitives { ////// Panel that lays out individual rows top to bottom. /// public class DataGridRowsPresenter : VirtualizingStackPanel { #region Scroll Methods ////// Calls the protected method BringIndexIntoView. /// /// The index of the row to scroll into view. ////// BringIndexIntoView should be callable either from the ItemsControl /// or directly on the panel. This was not done in WPF, so we are /// building this internally for the DataGrid. However, if a public /// way of calling BringIndexIntoView becomes a reality, then /// this method is no longer needed. /// internal void InternalBringIndexIntoView(int index) { BringIndexIntoView(index); } ////// This method is invoked when the IsItemsHost property changes. /// /// The old value of the IsItemsHost property. /// The new value of the IsItemsHost property. protected override void OnIsItemsHostChanged(bool oldIsItemsHost, bool newIsItemsHost) { base.OnIsItemsHostChanged(oldIsItemsHost, newIsItemsHost); if (newIsItemsHost) { DataGrid dataGrid = Owner; if (dataGrid != null) { // ItemsHost should be the "root" element which has // IsItemsHost = true on it. In the case of grouping, // IsItemsHost is true on all panels which are generating // content. Thus, we care only about the panel which // is generating content for the ItemsControl. IItemContainerGenerator generator = dataGrid.ItemContainerGenerator as IItemContainerGenerator; if (generator != null && generator == generator.GetItemContainerGeneratorForPanel(this)) { dataGrid.InternalItemsHost = this; } } } else { // No longer the items host, clear out the property on the DataGrid if ((_owner != null) && (_owner.InternalItemsHost == this)) { _owner.InternalItemsHost = null; } _owner = null; } } ////// Override of ViewportSizeChanged method which enqueues a dispatcher operation to redistribute /// the width among columns. /// /// viewport size before the change /// viewport size after the change protected override void OnViewportSizeChanged(Size oldViewportSize, Size newViewportSize) { DataGrid dataGrid = Owner; if (dataGrid != null) { ScrollContentPresenter scrollContentPresenter = dataGrid.InternalScrollContentPresenter; if (scrollContentPresenter == null || scrollContentPresenter.CanContentScroll) { dataGrid.OnViewportSizeChanged(oldViewportSize, newViewportSize); } } } #endregion #region Column Virtualization ////// Measure /// protected override Size MeasureOverride(Size constraint) { _availableSize = constraint; return base.MeasureOverride(constraint); } ////// Property which returns the last measure input size /// internal Size AvailableSize { get { return _availableSize; } } #endregion #region Row Virtualization ////// Override method to suppress the cleanup of rows /// with validation errors. /// /// protected override void OnCleanUpVirtualizedItem(CleanUpVirtualizedItemEventArgs e) { base.OnCleanUpVirtualizedItem(e); if (e.UIElement != null && Validation.GetHasError(e.UIElement)) { e.Cancel = true; } } #endregion #region Helpers internal DataGrid Owner { get { if (_owner == null) { _owner = ItemsControl.GetItemsOwner(this) as DataGrid; } return _owner; } } #endregion #region Data private DataGrid _owner; private Size _availableSize; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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