datalistview.cs

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            if (hasBooleanColumns)
                this.SetupSubItemCheckBoxes();
        }

        /// <summary>
        /// Generate aspect getters and putters for any columns that are missing them (and for which we have
        /// enough information to actually generate a getter)
        /// </summary>
        protected virtual void CreateMissingAspectGettersAndPutters()
        {
            for (int i = 0; i < this.Columns.Count; i++) {
                OLVColumn column = this.GetColumn(i);
                if (column.AspectGetter == null && !String.IsNullOrEmpty(column.AspectName)) {
                    column.AspectGetter = delegate(object row) {
                        // In most cases, rows will be DataRowView objects
                        DataRowView drv = row as DataRowView;
                        if (drv != null)
                            return drv[column.AspectName];
                        else
                            return column.GetAspectByName(row);
                    };
                }
                if (column.IsEditable && column.AspectPutter == null && !String.IsNullOrEmpty(column.AspectName)) {
                    column.AspectPutter = delegate(object row, object newValue) {
                        // In most cases, rows will be DataRowView objects
                        DataRowView drv = row as DataRowView;
                        if (drv != null)
                            drv[column.AspectName] = newValue;
                        else
                            column.PutAspectByName(row, newValue);
                    };
                }
            }
        }

        #endregion

        #region Object manipulations

        /// <summary>
        /// Add the given collection of model objects to this control.
        /// </summary>
        /// <param name="modelObjects">A collection of model objects</param>
        /// <remarks>This is a no-op for data lists, since the data
        /// is controlled by the DataSource. Manipulate the data source
        /// rather than this view of the data source.</remarks>
        public override void AddObjects(ICollection modelObjects)
        {
        }

        /// <summary>
        /// Remove the given collection of model objects from this control.
        /// </summary>
        /// <remarks>This is a no-op for data lists, since the data
        /// is controlled by the DataSource. Manipulate the data source
        /// rather than this view of the data source.</remarks>
        public override void RemoveObjects(ICollection modelObjects)
        {
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// What should we do when the list is unfrozen
        /// </summary>
        protected override void DoUnfreeze()
        {
            this.RebindDataSource(true);
        }

        /// <summary>
        /// Handles binding context changes
        /// </summary>
        /// <param name="e">The EventArgs that will be passed to any handlers
        /// of the BindingContextChanged event.</param>
        protected override void OnBindingContextChanged(EventArgs e)
        {
            base.OnBindingContextChanged(e);

            // If our binding context changes, we must rebind, since we will
            // have a new currency managers, even if we are still bound to the
            // same data source.
            this.RebindDataSource(false);
        }

        /// <summary>
        /// Handles parent binding context changes
        /// </summary>
        /// <param name="e">Unused EventArgs.</param>
        protected override void OnParentBindingContextChanged(EventArgs e)
        {
            base.OnParentBindingContextChanged(e);

            // BindingContext is an ambient property - by default it simply picks
            // up the parent control's context (unless something has explicitly
            // given us our own). So we must respond to changes in our parent's
            // binding context in the same way we would changes to our own
            // binding context.
            this.RebindDataSource(false);
        }

        // CurrencyManager ListChanged event handler.
        // Deals with fine-grained changes to list items.
        // It's actually difficult to deal with these changes in a fine-grained manner.
        // If our listview is grouped, then any change may make a new group appear or
        // an old group disappear. It is rarely enough to simply update the affected row.
        protected virtual void currencyManager_ListChanged(object sender, ListChangedEventArgs e)
        {
            switch (e.ListChangedType) {

                // Well, usually fine-grained... The whole list has changed utterly, so reload it.
                case ListChangedType.Reset:
                    this.InitializeDataSource();
                    break;

                // A single item has changed, so just refresh that.
                // TODO: Even in this simple case, we should probably rebuild the list.
                case ListChangedType.ItemChanged:
                    Object changedRow = this.currencyManager.List[e.NewIndex];
                    this.RefreshObject(changedRow);
                    break;

                // A new item has appeared, so add that.
                // We get this event twice if certain grid controls are used to add a new row to a
                // datatable: once when the editing of a new row begins, and once again when that
                // editing commits. (If the user cancels the creation of the new row, we never see
                // the second creation.) We detect this by seeing if this is a view on a row in a
                // DataTable, and if it is, testing to see if it's a new row under creation.
                case ListChangedType.ItemAdded:
                    Object newRow = this.currencyManager.List[e.NewIndex];
                    DataRowView drv = newRow as DataRowView;
                    if (drv == null || !drv.IsNew) {
                        // Either we're not dealing with a view on a data table, or this is the commit
                        // notification. Either way, this is the final notification, so we want to
                        // handle the new row now!
                        this.InitializeDataSource();
                    }
                    break;

                // An item has gone away.
                case ListChangedType.ItemDeleted:
                    this.InitializeDataSource();
                    break;

                // An item has changed its index.
                case ListChangedType.ItemMoved:
                    this.InitializeDataSource();
                    break;

                // Something has changed in the metadata.
                // CHECK: When are these events actually fired?
                case ListChangedType.PropertyDescriptorAdded:
                case ListChangedType.PropertyDescriptorChanged:
                case ListChangedType.PropertyDescriptorDeleted:
                    this.InitializeDataSource();
                    break;
            }
        }

        // The CurrencyManager calls this if the data source looks
        // different. We just reload everything.
        // CHECK: Do we need this if we are handle ListChanged metadata events?
        protected virtual void currencyManager_MetaDataChanged(object sender, EventArgs e)
        {
            this.InitializeDataSource();
        }

        // Called by the CurrencyManager when the currently selected item
        // changes. We update the ListView selection so that we stay in sync
        // with any other controls bound to the same source.
        protected virtual void currencyManager_PositionChanged(object sender, EventArgs e)
        {
            int index = this.currencyManager.Position;

            // Make sure the index is sane (-1 pops up from time to time)
            if (index < 0 || index >= this.Items.Count)
                return;

            // Avoid recursion. If we are currently changing the index, don't
            // start the process again.
            if (this.isChangingIndex)
                return;

            try {
                this.isChangingIndex = true;

                // We can't use the index directly, since our listview may be sorted
                this.SelectedObject = this.currencyManager.List[index];

                // THINK: Do we always want to bring it into view?
                if (this.SelectedItems.Count > 0)
                    this.SelectedItems[0].EnsureVisible();

            }
            finally {
                this.isChangingIndex = false;
            }
        }
        private bool isChangingIndex = false;

        /// <summary>
        /// Handle a SelectedIndexChanged event
        /// </summary>
        /// <param name="e">The event</param>
        /// <remarks>
        /// Called by Windows Forms when the currently selected index of the
        /// control changes. This usually happens because the user clicked on
        /// the control. In this case we want to notify the CurrencyManager so
        /// that any other bound controls will remain in sync. This method will
        /// also be called when we changed our index as a result of a
        /// notification that originated from the CurrencyManager, and in that
        /// case we avoid notifying the CurrencyManager back!
        /// </remarks>
        protected override void OnSelectedIndexChanged(EventArgs e)
        {
            base.OnSelectedIndexChanged(e);

            // Prevent recursion
            if (this.isChangingIndex)
                return;

            // If we are bound to a datasource, and only one item is selected,
            // tell the currency manager which item is selected.
            if (this.SelectedIndices.Count == 1 && this.currencyManager != null) {
                try {
                    this.isChangingIndex = true;

                    // We can't use the selectedIndex directly, since our listview may be sorted.
                    // So we have to find the index of the selected object within the original list.
                    this.currencyManager.Position = this.currencyManager.List.IndexOf(this.SelectedObject);
                }
                finally {
                    this.isChangingIndex = false;
                }
            }
        }

        #endregion

    }
}