/
DataGridColumnCollection.cs
659 lines (567 loc) · 25.7 KB
/
DataGridColumnCollection.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using Microsoft.Toolkit.Uwp.UI.Controls.DataGridInternals;
namespace Microsoft.Toolkit.Uwp.UI.Controls
{
internal class DataGridColumnCollection : ObservableCollection<DataGridColumn>
{
private DataGrid _owningGrid;
public DataGridColumnCollection(DataGrid owningGrid)
{
_owningGrid = owningGrid;
this.ItemsInternal = new List<DataGridColumn>();
this.FillerColumn = new DataGridFillerColumn(owningGrid);
this.DisplayIndexMap = new List<int>();
this.RowGroupSpacerColumn = new DataGridFillerColumn(owningGrid);
}
internal int AutogeneratedColumnCount
{
get;
set;
}
internal List<int> DisplayIndexMap
{
get;
set;
}
internal DataGridFillerColumn FillerColumn
{
get;
private set;
}
internal DataGridColumn FirstColumn
{
get
{
return GetFirstColumn(null /*isVisible*/, null /*isFrozen*/, null /*isReadOnly*/);
}
}
internal DataGridColumn FirstVisibleColumn
{
get
{
return GetFirstColumn(true /*isVisible*/, null /*isFrozen*/, null /*isReadOnly*/);
}
}
internal DataGridColumn FirstVisibleNonFillerColumn
{
get
{
DataGridColumn dataGridColumn = this.FirstVisibleColumn;
if (dataGridColumn == this.RowGroupSpacerColumn)
{
dataGridColumn = GetNextVisibleColumn(dataGridColumn);
}
return dataGridColumn;
}
}
internal DataGridColumn FirstVisibleWritableColumn
{
get
{
return GetFirstColumn(true /*isVisible*/, null /*isFrozen*/, false /*isReadOnly*/);
}
}
internal DataGridColumn FirstVisibleScrollingColumn
{
get
{
return GetFirstColumn(true /*isVisible*/, false /*isFrozen*/, null /*isReadOnly*/);
}
}
internal List<DataGridColumn> ItemsInternal
{
get;
private set;
}
internal DataGridColumn LastVisibleColumn
{
get
{
return GetLastColumn(true /*isVisible*/, null /*isFrozen*/, null /*isReadOnly*/);
}
}
internal DataGridColumn LastVisibleScrollingColumn
{
get
{
return GetLastColumn(true /*isVisible*/, false /*isFrozen*/, null /*isReadOnly*/);
}
}
internal DataGridColumn LastVisibleWritableColumn
{
get
{
return GetLastColumn(true /*isVisible*/, null /*isFrozen*/, false /*isReadOnly*/);
}
}
internal DataGridFillerColumn RowGroupSpacerColumn
{
get;
private set;
}
internal int VisibleColumnCount
{
get
{
int visibleColumnCount = 0;
for (int columnIndex = 0; columnIndex < this.ItemsInternal.Count; columnIndex++)
{
if (this.ItemsInternal[columnIndex].IsVisible)
{
visibleColumnCount++;
}
}
return visibleColumnCount;
}
}
internal double VisibleEdgedColumnsWidth
{
get;
private set;
}
/// <summary>
/// Gets the number of star columns that are currently visible.
/// NOTE: Requires that EnsureVisibleEdgedColumnsWidth has been called.
/// </summary>
internal int VisibleStarColumnCount
{
get;
private set;
}
protected override void ClearItems()
{
Debug.Assert(_owningGrid != null, "Expected non-null owning DataGrid.");
try
{
_owningGrid.NoCurrentCellChangeCount++;
if (this.ItemsInternal.Count > 0)
{
if (_owningGrid.InDisplayIndexAdjustments)
{
// We are within columns display indexes adjustments. We do not allow changing the column collection while adjusting display indexes.
throw DataGridError.DataGrid.CannotChangeColumnCollectionWhileAdjustingDisplayIndexes();
}
_owningGrid.OnClearingColumns();
for (int columnIndex = 0; columnIndex < this.ItemsInternal.Count; columnIndex++)
{
// Detach the column...
this.ItemsInternal[columnIndex].OwningGrid = null;
}
this.ItemsInternal.Clear();
this.DisplayIndexMap.Clear();
this.AutogeneratedColumnCount = 0;
_owningGrid.OnColumnCollectionChanged_PreNotification(false /*columnsGrew*/);
base.ClearItems();
this.VisibleEdgedColumnsWidth = 0;
_owningGrid.OnColumnCollectionChanged_PostNotification(false /*columnsGrew*/);
}
}
finally
{
_owningGrid.NoCurrentCellChangeCount--;
}
}
protected override void InsertItem(int columnIndex, DataGridColumn dataGridColumn)
{
Debug.Assert(_owningGrid != null, "Expected non-null owning DataGrid.");
try
{
_owningGrid.NoCurrentCellChangeCount++;
if (_owningGrid.InDisplayIndexAdjustments)
{
// We are within columns display indexes adjustments. We do not allow changing the column collection while adjusting display indexes.
throw DataGridError.DataGrid.CannotChangeColumnCollectionWhileAdjustingDisplayIndexes();
}
if (dataGridColumn == null)
{
throw new ArgumentNullException("dataGridColumn");
}
int columnIndexWithFiller = columnIndex;
if (dataGridColumn != this.RowGroupSpacerColumn && this.RowGroupSpacerColumn.IsRepresented)
{
columnIndexWithFiller++;
}
// get the new current cell coordinates
DataGridCellCoordinates newCurrentCellCoordinates = _owningGrid.OnInsertingColumn(columnIndex, dataGridColumn);
// insert the column into our internal list
this.ItemsInternal.Insert(columnIndexWithFiller, dataGridColumn);
dataGridColumn.Index = columnIndexWithFiller;
dataGridColumn.OwningGrid = _owningGrid;
dataGridColumn.RemoveEditingElement();
if (dataGridColumn.IsVisible)
{
this.VisibleEdgedColumnsWidth += dataGridColumn.ActualWidth;
}
// continue with the base insert
_owningGrid.OnInsertedColumn_PreNotification(dataGridColumn);
_owningGrid.OnColumnCollectionChanged_PreNotification(true /*columnsGrew*/);
if (dataGridColumn != this.RowGroupSpacerColumn)
{
base.InsertItem(columnIndex, dataGridColumn);
}
_owningGrid.OnInsertedColumn_PostNotification(newCurrentCellCoordinates, dataGridColumn.DisplayIndex);
_owningGrid.OnColumnCollectionChanged_PostNotification(true /*columnsGrew*/);
}
finally
{
_owningGrid.NoCurrentCellChangeCount--;
}
}
protected override void RemoveItem(int columnIndex)
{
RemoveItemPrivate(columnIndex, false /*isSpacer*/);
}
protected override void SetItem(int columnIndex, DataGridColumn dataGridColumn)
{
throw new NotSupportedException();
}
internal bool DisplayInOrder(int columnIndex1, int columnIndex2)
{
int displayIndex1 = ((DataGridColumn)this.ItemsInternal[columnIndex1]).DisplayIndexWithFiller;
int displayIndex2 = ((DataGridColumn)this.ItemsInternal[columnIndex2]).DisplayIndexWithFiller;
return displayIndex1 < displayIndex2;
}
internal bool EnsureRowGrouping(bool rowGrouping)
{
// The insert below could cause the first column to be added. That causes a refresh
// which re-enters this method so instead of checking RowGroupSpacerColumn.IsRepresented,
// we need to check to see if it's actually in our collection instead.
bool spacerRepresented = (this.ItemsInternal.Count > 0) && (this.ItemsInternal[0] == this.RowGroupSpacerColumn);
if (rowGrouping && !spacerRepresented)
{
this.Insert(0, this.RowGroupSpacerColumn);
this.RowGroupSpacerColumn.IsRepresented = true;
return true;
}
else if (!rowGrouping && spacerRepresented)
{
Debug.Assert(this.ItemsInternal[0] == this.RowGroupSpacerColumn, "Unexpected RowGroupSpacerColumn value.");
// We need to set IsRepresented to false before removing the RowGroupSpacerColumn
// otherwise, we'll remove the column after it
this.RowGroupSpacerColumn.IsRepresented = false;
RemoveItemPrivate(0, true /*isSpacer*/);
Debug.Assert(this.DisplayIndexMap.Count == this.ItemsInternal.Count, "Unexpected DisplayIndexMap.Count value.");
return true;
}
return false;
}
/// <summary>
/// In addition to ensuring that column widths are valid, this method updates the values of
/// VisibleEdgedColumnsWidth and VisibleStarColumnCount.
/// </summary>
internal void EnsureVisibleEdgedColumnsWidth()
{
this.VisibleStarColumnCount = 0;
this.VisibleEdgedColumnsWidth = 0;
for (int columnIndex = 0; columnIndex < this.ItemsInternal.Count; columnIndex++)
{
if (this.ItemsInternal[columnIndex].IsVisible)
{
this.ItemsInternal[columnIndex].EnsureWidth();
if (this.ItemsInternal[columnIndex].Width.IsStar)
{
this.VisibleStarColumnCount++;
}
this.VisibleEdgedColumnsWidth += this.ItemsInternal[columnIndex].ActualWidth;
}
}
}
internal DataGridColumn GetColumnAtDisplayIndex(int displayIndex)
{
if (displayIndex < 0 || displayIndex >= this.ItemsInternal.Count || displayIndex >= this.DisplayIndexMap.Count)
{
return null;
}
int columnIndex = this.DisplayIndexMap[displayIndex];
return this.ItemsInternal[columnIndex];
}
internal int GetColumnCount(bool isVisible, bool isFrozen, int fromColumnIndex, int toColumnIndex)
{
Debug.Assert(DisplayInOrder(fromColumnIndex, toColumnIndex), "Unexpected column display order.");
Debug.Assert(this.ItemsInternal[toColumnIndex].IsVisible == isVisible, "Unexpected column visibility state.");
Debug.Assert(this.ItemsInternal[toColumnIndex].IsFrozen == isFrozen, "Unexpected column frozen state.");
int columnCount = 0;
DataGridColumn dataGridColumn = this.ItemsInternal[fromColumnIndex];
while (dataGridColumn != this.ItemsInternal[toColumnIndex])
{
dataGridColumn = GetNextColumn(dataGridColumn, isVisible, isFrozen, null /*isReadOnly*/);
Debug.Assert(dataGridColumn != null, "Expected non-null dataGridColumn.");
columnCount++;
}
return columnCount;
}
internal IEnumerable<DataGridColumn> GetDisplayedColumns()
{
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
foreach (int columnIndex in this.DisplayIndexMap)
{
yield return this.ItemsInternal[columnIndex];
}
}
/// <summary>
/// Returns an enumeration of all columns that meet the criteria of the filter predicate.
/// </summary>
/// <param name="filter">Criteria for inclusion.</param>
/// <returns>Columns that meet the criteria, in ascending DisplayIndex order.</returns>
internal IEnumerable<DataGridColumn> GetDisplayedColumns(Predicate<DataGridColumn> filter)
{
Debug.Assert(filter != null, "Expected non-null filter.");
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
foreach (int columnIndex in this.DisplayIndexMap)
{
DataGridColumn column = this.ItemsInternal[columnIndex];
if (filter(column))
{
yield return column;
}
}
}
/// <summary>
/// Returns an enumeration of all columns that meet the criteria of the filter predicate.
/// The columns are returned in the order specified by the reverse flag.
/// </summary>
/// <param name="reverse">Whether or not to return the columns in descending DisplayIndex order.</param>
/// <param name="filter">Criteria for inclusion.</param>
/// <returns>Columns that meet the criteria, in the order specified by the reverse flag.</returns>
internal IEnumerable<DataGridColumn> GetDisplayedColumns(bool reverse, Predicate<DataGridColumn> filter)
{
return reverse ? GetDisplayedColumnsReverse(filter) : GetDisplayedColumns(filter);
}
/// <summary>
/// Returns an enumeration of all columns that meet the criteria of the filter predicate.
/// The columns are returned in descending DisplayIndex order.
/// </summary>
/// <param name="filter">Criteria for inclusion.</param>
/// <returns>Columns that meet the criteria, in descending DisplayIndex order.</returns>
internal IEnumerable<DataGridColumn> GetDisplayedColumnsReverse(Predicate<DataGridColumn> filter)
{
Debug.Assert(filter != null, "Expected non-null filter.");
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
for (int displayIndex = this.DisplayIndexMap.Count - 1; displayIndex >= 0; displayIndex--)
{
DataGridColumn column = this.ItemsInternal[this.DisplayIndexMap[displayIndex]];
if (filter(column))
{
yield return column;
}
}
}
internal DataGridColumn GetFirstColumn(bool? isVisible, bool? isFrozen, bool? isReadOnly)
{
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
int index = 0;
while (index < this.DisplayIndexMap.Count)
{
DataGridColumn dataGridColumn = GetColumnAtDisplayIndex(index);
if ((isVisible == null || dataGridColumn.IsVisible == isVisible) &&
(isFrozen == null || dataGridColumn.IsFrozen == isFrozen) &&
(isReadOnly == null || dataGridColumn.IsReadOnly == isReadOnly))
{
return dataGridColumn;
}
index++;
}
return null;
}
internal DataGridColumn GetLastColumn(bool? isVisible, bool? isFrozen, bool? isReadOnly)
{
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
int index = this.DisplayIndexMap.Count - 1;
while (index >= 0)
{
DataGridColumn dataGridColumn = GetColumnAtDisplayIndex(index);
if ((isVisible == null || dataGridColumn.IsVisible == isVisible) &&
(isFrozen == null || dataGridColumn.IsFrozen == isFrozen) &&
(isReadOnly == null || dataGridColumn.IsReadOnly == isReadOnly))
{
return dataGridColumn;
}
index--;
}
return null;
}
internal DataGridColumn GetNextColumn(DataGridColumn dataGridColumnStart)
{
return GetNextColumn(dataGridColumnStart, null /*isVisible*/, null /*isFrozen*/, null /*isReadOnly*/);
}
internal DataGridColumn GetNextColumn(
DataGridColumn dataGridColumnStart,
bool? isVisible,
bool? isFrozen,
bool? isReadOnly)
{
Debug.Assert(dataGridColumnStart != null, "Expected non-null dataGridColumnStart.");
Debug.Assert(this.ItemsInternal.Contains(dataGridColumnStart), "Expected dataGridColumnStart in ItemsInternal.");
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
int index = dataGridColumnStart.DisplayIndexWithFiller + 1;
while (index < this.DisplayIndexMap.Count)
{
DataGridColumn dataGridColumn = GetColumnAtDisplayIndex(index);
if ((isVisible == null || dataGridColumn.IsVisible == isVisible) &&
(isFrozen == null || dataGridColumn.IsFrozen == isFrozen) &&
(isReadOnly == null || dataGridColumn.IsReadOnly == isReadOnly))
{
return dataGridColumn;
}
index++;
}
return null;
}
internal DataGridColumn GetNextVisibleColumn(DataGridColumn dataGridColumnStart)
{
return GetNextColumn(dataGridColumnStart, true /*isVisible*/, null /*isFrozen*/, null /*isReadOnly*/);
}
internal DataGridColumn GetNextVisibleFrozenColumn(DataGridColumn dataGridColumnStart)
{
return GetNextColumn(dataGridColumnStart, true /*isVisible*/, true /*isFrozen*/, null /*isReadOnly*/);
}
internal DataGridColumn GetNextVisibleWritableColumn(DataGridColumn dataGridColumnStart)
{
return GetNextColumn(dataGridColumnStart, true /*isVisible*/, null /*isFrozen*/, false /*isReadOnly*/);
}
internal DataGridColumn GetPreviousColumn(
DataGridColumn dataGridColumnStart,
bool? isVisible,
bool? isFrozen,
bool? isReadOnly)
{
Debug.Assert(dataGridColumnStart != null, "Expected non-null dataGridColumnStart.");
Debug.Assert(this.ItemsInternal.Contains(dataGridColumnStart), "Expected dataGridColumnStart in ItemsInternal.");
Debug.Assert(this.ItemsInternal.Count == this.DisplayIndexMap.Count, "Unexpected DisplayIndexMap.Count value.");
int index = dataGridColumnStart.DisplayIndexWithFiller - 1;
while (index >= 0)
{
DataGridColumn dataGridColumn = GetColumnAtDisplayIndex(index);
if ((isVisible == null || dataGridColumn.IsVisible == isVisible) &&
(isFrozen == null || dataGridColumn.IsFrozen == isFrozen) &&
(isReadOnly == null || dataGridColumn.IsReadOnly == isReadOnly))
{
return dataGridColumn;
}
index--;
}
return null;
}
internal DataGridColumn GetPreviousVisibleNonFillerColumn(DataGridColumn dataGridColumnStart)
{
DataGridColumn column = GetPreviousColumn(dataGridColumnStart, true /*isVisible*/, null /*isFrozen*/, null /*isReadOnly*/);
return (column is DataGridFillerColumn) ? null : column;
}
internal DataGridColumn GetPreviousVisibleScrollingColumn(DataGridColumn dataGridColumnStart)
{
return GetPreviousColumn(dataGridColumnStart, true /*isVisible*/, false /*isFrozen*/, null /*isReadOnly*/);
}
internal DataGridColumn GetPreviousVisibleWritableColumn(DataGridColumn dataGridColumnStart)
{
return GetPreviousColumn(dataGridColumnStart, true /*isVisible*/, null /*isFrozen*/, false /*isReadOnly*/);
}
internal int GetVisibleColumnCount(int fromColumnIndex, int toColumnIndex)
{
Debug.Assert(DisplayInOrder(fromColumnIndex, toColumnIndex), "Unexpected column display order.");
Debug.Assert(this.ItemsInternal[toColumnIndex].IsVisible, "Unexpected column visibility state.");
int columnCount = 0;
DataGridColumn dataGridColumn = this.ItemsInternal[fromColumnIndex];
while (dataGridColumn != this.ItemsInternal[toColumnIndex])
{
dataGridColumn = GetNextVisibleColumn(dataGridColumn);
Debug.Assert(dataGridColumn != null, "Expected non-null dataGridColumn.");
columnCount++;
}
return columnCount;
}
internal IEnumerable<DataGridColumn> GetVisibleColumns()
{
Predicate<DataGridColumn> filter = column => column.IsVisible;
return GetDisplayedColumns(filter);
}
internal IEnumerable<DataGridColumn> GetVisibleFrozenColumns()
{
Predicate<DataGridColumn> filter = column => column.IsVisible && column.IsFrozen;
return GetDisplayedColumns(filter);
}
internal double GetVisibleFrozenEdgedColumnsWidth()
{
double visibleFrozenColumnsWidth = 0;
for (int columnIndex = 0; columnIndex < this.ItemsInternal.Count; columnIndex++)
{
if (this.ItemsInternal[columnIndex].IsVisible && this.ItemsInternal[columnIndex].IsFrozen)
{
visibleFrozenColumnsWidth += this.ItemsInternal[columnIndex].ActualWidth;
}
}
return visibleFrozenColumnsWidth;
}
internal IEnumerable<DataGridColumn> GetVisibleScrollingColumns()
{
Predicate<DataGridColumn> filter = column => column.IsVisible && !column.IsFrozen;
return GetDisplayedColumns(filter);
}
private void RemoveItemPrivate(int columnIndex, bool isSpacer)
{
Debug.Assert(_owningGrid != null, "Expected non-null owning DataGrid.");
try
{
_owningGrid.NoCurrentCellChangeCount++;
if (_owningGrid.InDisplayIndexAdjustments)
{
// We are within columns display indexes adjustments. We do not allow changing the column collection while adjusting display indexes.
throw DataGridError.DataGrid.CannotChangeColumnCollectionWhileAdjustingDisplayIndexes();
}
int columnIndexWithFiller = columnIndex;
if (!isSpacer && this.RowGroupSpacerColumn.IsRepresented)
{
columnIndexWithFiller++;
}
Debug.Assert(columnIndexWithFiller >= 0 && columnIndexWithFiller < this.ItemsInternal.Count, "Unexpected columnIndexWithFiller value.");
DataGridColumn dataGridColumn = this.ItemsInternal[columnIndexWithFiller];
DataGridCellCoordinates newCurrentCellCoordinates = _owningGrid.OnRemovingColumn(dataGridColumn);
this.ItemsInternal.RemoveAt(columnIndexWithFiller);
if (dataGridColumn.IsVisible)
{
this.VisibleEdgedColumnsWidth -= dataGridColumn.ActualWidth;
}
dataGridColumn.OwningGrid = null;
dataGridColumn.RemoveEditingElement();
// continue with the base remove
_owningGrid.OnRemovedColumn_PreNotification(dataGridColumn);
_owningGrid.OnColumnCollectionChanged_PreNotification(false /*columnsGrew*/);
if (!isSpacer)
{
base.RemoveItem(columnIndex);
}
_owningGrid.OnRemovedColumn_PostNotification(newCurrentCellCoordinates);
_owningGrid.OnColumnCollectionChanged_PostNotification(false /*columnsGrew*/);
}
finally
{
_owningGrid.NoCurrentCellChangeCount--;
}
}
#if DEBUG
internal bool Debug_VerifyColumnDisplayIndexes()
{
for (int columnDisplayIndex = 0; columnDisplayIndex < this.ItemsInternal.Count; columnDisplayIndex++)
{
if (GetColumnAtDisplayIndex(columnDisplayIndex) == null)
{
return false;
}
}
return true;
}
internal void Debug_PrintColumns()
{
foreach (DataGridColumn column in this.ItemsInternal)
{
Debug.WriteLine(string.Format(System.Globalization.CultureInfo.InvariantCulture, "{0} {1} {2}", column.Header, column.Index, column.DisplayIndex));
}
}
#endif
}
}