C# OLVListItem.GetSubItem方法代码示例

        private void ApplyHyperlinkStyle(int rowIndex, OLVListItem olvi)
        {
            olvi.UseItemStyleForSubItems = false;

            // If subitem 0 is given a back color, the item back color is changed too.
            // So we have to remember it here so we can used it even if subitem 0 is changed.
            Color itemBackColor = olvi.BackColor;

            for (int i = 0; i < this.Columns.Count; i++) {
                OLVListSubItem subItem = olvi.GetSubItem(i);
                if (subItem == null)
                    continue;
                OLVColumn column = this.GetColumn(i);
                subItem.BackColor = itemBackColor;
                if (column.Hyperlink && !String.IsNullOrEmpty(subItem.Url)) {
                    if (this.IsUrlVisited(subItem.Url))
                        this.ApplyCellStyle(olvi, i, this.HyperlinkStyle.Visited);
                    else
                        this.ApplyCellStyle(olvi, i, this.HyperlinkStyle.Normal);
                }
            }
        }

        /// <summary>
        /// Trigger FormatRow and possibly FormatCell events for the given item
        /// </summary>
        /// <param name="rowIndex"></param>
        /// <param name="displayIndex"></param>
        /// <param name="olvi"></param>
        protected virtual void TriggerFormatRowEvent(int rowIndex, int displayIndex, OLVListItem olvi)
        {
            FormatRowEventArgs args = new FormatRowEventArgs();
            args.ListView = this;
            args.RowIndex = rowIndex;
            args.DisplayIndex = displayIndex;
            args.Item = olvi;
            args.UseCellFormatEvents = this.UseCellFormatEvents;
            this.OnFormatRow(args);

            if (args.UseCellFormatEvents && this.View == View.Details) {
                // If a cell isn't given its own color, it should use the color of the item.
                // However, there is a bug in the .NET framework where the cell are given
                // the color of the ListView instead. So we have to explicitly give each
                // cell the back color that it should have.
                olvi.UseItemStyleForSubItems = false;
                Color backColor = olvi.BackColor;
                for (int i = 0; i < this.Columns.Count; i++) {
                    olvi.SubItems[i].BackColor = backColor;
                }

                // Fire one event per cell
                FormatCellEventArgs args2 = new FormatCellEventArgs();
                args2.ListView = this;
                args2.RowIndex = rowIndex;
                args2.DisplayIndex = displayIndex;
                args2.Item = olvi;
                for (int i = 0; i < this.Columns.Count; i++) {
                    args2.ColumnIndex = i;
                    args2.Column = this.GetColumn(i);
                    args2.SubItem = olvi.GetSubItem(i);
                    this.OnFormatCell(args2);
                }
            }
        }

        /// <summary>
        /// Update the given row using the given hot item information
        /// </summary>
        /// <param name="rowIndex"></param>
        /// <param name="columnIndex"></param>
        /// <param name="hitLocation"></param>
        /// <param name="olvi"></param>
        protected virtual void UpdateHotRow(int rowIndex, int columnIndex, HitTestLocation hitLocation, OLVListItem olvi)
        {
            if (rowIndex < 0 || columnIndex < 0)
                return;

            if (this.UseHyperlinks) {
                OLVColumn column = this.GetColumn(columnIndex);
                OLVListSubItem subItem = olvi.GetSubItem(columnIndex);
                if (column.Hyperlink && hitLocation == HitTestLocation.Text && !String.IsNullOrEmpty(subItem.Url)) {
                    this.ApplyCellStyle(olvi, columnIndex, this.HyperlinkStyle.Over);
                    this.Cursor = this.HyperlinkStyle.OverCursor ?? Cursors.Default;
                } else {
                    this.Cursor = Cursors.Default;
                }
            }

            if (this.UseHotItem) {
                if (!olvi.Selected) {
                    this.ApplyRowStyle(olvi, this.HotItemStyle);
                }
            }
        }

        /// <summary>
        /// Calculate the bounds of the edit control for the given item/column, when the listview
        /// is not being owner drawn.
        /// </summary>
        /// <param name="item"></param>
        /// <param name="subItemIndex"></param>
        /// <param name="cellBounds"></param>
        /// <param name="preferredSize"> </param>
        /// <returns>A rectangle that is the bounds of the cell editor</returns>
        protected Rectangle CalculateCellEditorBoundsStandard(OLVListItem item, int subItemIndex, Rectangle cellBounds, Size preferredSize) {
            if (this.View != View.Details)
                return cellBounds;

            // Allow for image (if there is one). 
            int offset = 0;
            object imageSelector = null;
            if (subItemIndex == 0)
                imageSelector = item.ImageSelector;
            else {
                // We only check for subitem images if we are owner drawn or showing subitem images
                if (this.OwnerDraw || this.ShowImagesOnSubItems)
                    imageSelector = item.GetSubItem(subItemIndex).ImageSelector;
            }
            if (this.GetActualImageIndex(imageSelector) != -1) {
                offset += this.SmallImageSize.Width + 2;
            }

            // Allow for checkbox
            if (this.CheckBoxes && this.StateImageList != null && subItemIndex == 0) {
                offset += this.StateImageList.ImageSize.Width + 2;
            }

            // Allow for indent (first column only)
            if (subItemIndex == 0 && item.IndentCount > 0) {
                offset += (this.SmallImageSize.Width * item.IndentCount);
            }

            // Do the adjustment
            if (offset > 0) {
                cellBounds.X += offset;
                cellBounds.Width -= offset;
            }

            return cellBounds;
        }

        /// <summary>
        /// Tell the underlying list control which images to show against the subitems
        /// </summary>
        /// <param name="rowIndex">the index at which the item occurs</param>
        /// <param name="item">the item whose subitems are to be set</param>
        /// <param name="shouldClearImages">will existing images be cleared if no new image is provided?</param>
        protected virtual void SetSubItemImages(int rowIndex, OLVListItem item, bool shouldClearImages)
        {
            if (!this.ShowImagesOnSubItems || this.OwnerDraw)
                return;

            for (int i = 1; i < item.SubItems.Count; i++) {
                this.SetSubItemImage(rowIndex, i, item.GetSubItem(i), shouldClearImages);
            }
        }

        /// <summary>
        /// Calculate the edit rectangle
        /// </summary>
        /// <param name="g"></param>
        /// <param name="cellBounds"></param>
        /// <param name="item"></param>
        /// <param name="subItemIndex"></param>
        /// <param name="preferredSize"> </param>
        /// <returns></returns>
        public override Rectangle GetEditRectangle(Graphics g, Rectangle cellBounds, OLVListItem item, int subItemIndex, Size preferredSize)
        {
            this.ClearState();

            this.ListView = (ObjectListView) item.ListView;
            this.ListItem = item;
            this.SubItem = item.GetSubItem(subItemIndex);
            this.Column = this.ListView.GetColumn(subItemIndex);
            this.RowObject = item.RowObject;
            this.IsItemSelected = this.ListItem.Selected && this.ListItem.Enabled;
            this.Bounds = cellBounds;

            return this.HandleGetEditRectangle(g, cellBounds, item, subItemIndex, preferredSize);
        }

        /// <summary>
        /// Calculate the edit rectangle
        /// </summary>
        /// <param name="g"></param>
        /// <param name="cellBounds"></param>
        /// <param name="item"></param>
        /// <param name="subItemIndex"></param>
        /// <returns></returns>
        public override Rectangle GetEditRectangle(Graphics g, Rectangle cellBounds, OLVListItem item, int subItemIndex)
        {
            ClearState();

            ListView = (ObjectListView) item.ListView;
            ListItem = item;
            SubItem = item.GetSubItem(subItemIndex);
            Column = ListView.GetColumn(subItemIndex);
            RowObject = item.RowObject;
            IsItemSelected = ListItem.Selected;
            Bounds = cellBounds;

            return HandleGetEditRectangle(g, cellBounds, item, subItemIndex);
        }

 /// <summary>
 /// Rebuild the given ListViewItem with the data from its associated model.
 /// </summary>
 /// <remarks>This method does not resort or regroup the view. It simply updates
 /// the displayed data of the given item</remarks>
 public virtual void RefreshItem(OLVListItem olvi) {
     olvi.UseItemStyleForSubItems = true;
     olvi.SubItems.Clear();
     this.FillInValues(olvi, olvi.RowObject);
     if (this.GetColumn(0).IsRowNumberColumn)
     {
         int idx = olvi.Index;
         olvi.GetSubItem(0).Text = (++idx).ToString();
     }
     this.PostProcessOneRow(olvi.Index, this.GetDisplayOrderOfItemIndex(olvi.Index), olvi);
 }

        /// <summary>
        /// Insert the given collection of objects before the given position
        /// </summary>
        /// <param name="index">Where to insert the objects</param>
        /// <param name="modelObjects">The objects to be inserted</param>
        /// <remarks>
        /// <para>
        /// This operation only makes sense of non-sorted, non-grouped
        /// lists, since any subsequent sort/group operation will rearrange
        /// the list.
        /// </para>
        /// <para>This method only works on ObjectListViews and FastObjectListViews.</para>
        ///</remarks>
        public virtual void InsertObjects(int index, ICollection modelObjects) {
            if (this.InvokeRequired) {
                this.Invoke((MethodInvoker)delegate() {
                    this.InsertObjects(index, modelObjects);
                });
                return;
            }
            if (modelObjects == null)
                return;

            this.BeginUpdate();
            try {
                // Give the world a chance to cancel or change the added objects
                ItemsAddingEventArgs args = new ItemsAddingEventArgs(modelObjects);
                this.OnItemsAdding(args);
                if (args.Canceled)
                    return;
                modelObjects = args.ObjectsToAdd;

                this.TakeOwnershipOfObjects();
                ArrayList ourObjects = ObjectListView.EnumerableToArray(this.Objects, false);

                // If we are filtering the list, there is no way to efficiently
                // insert the objects, so just put them into our collection and rebuild.
                if (this.IsFiltering) {
                    index = Math.Max(0, Math.Min(index, ourObjects.Count));
                    ourObjects.InsertRange(index, modelObjects);
                    this.BuildList(true);
                } else {
                    this.ListViewItemSorter = null;
                    index = Math.Max(0, Math.Min(index, this.GetItemCount()));
                    int i = index;
                    foreach (object modelObject in modelObjects) {
                        if (modelObject != null) {
                            ourObjects.Insert(i, modelObject);
                            OLVListItem lvi = new OLVListItem(modelObject);
                            this.FillInValues(lvi, modelObject);
                            if (this.GetColumn(0).IsRowNumberColumn)
                            {
                                lvi.GetSubItem(0).Text = (i+1).ToString();
                            }
                            this.Items.Insert(i, lvi);
                            i++;
                        }
                    }

                    for (i = index; i < this.GetItemCount(); i++) {
                        OLVListItem lvi = this.GetItem(i);
                        this.SetSubItemImages(lvi.Index, lvi);
                    }

                    this.PostProcessRows();
                }
                UpdateRowNumber();
                // Tell the world that the list has changed
                this.SubscribeNotifications(modelObjects);
                this.OnItemsChanged(new ItemsChangedEventArgs());
            } finally {
                this.EndUpdate();
            }
        }

        /// <summary>
        /// Build/rebuild all the list view items in the list
        /// </summary>
        /// <param name="shouldPreserveState">If this is true, the control will try to preserve the selection,
        /// focused item, and the scroll position (see Remarks)
        /// </param>
        /// <remarks>
        /// <para>
        /// Use this method in situations were the contents of the list is basically the same
        /// as previously.
        /// </para>
        /// </remarks>
        public virtual void BuildList(bool shouldPreserveState) {
            if (this.Frozen)
                return;

            Stopwatch sw = Stopwatch.StartNew();

            this.ApplyExtendedStyles();
            this.ClearHotItem();
            int previousTopIndex = this.TopItemIndex;
            Point currentScrollPosition = this.LowLevelScrollPosition;

            IList previousSelection = new ArrayList();
            Object previousFocus = null;
            if (shouldPreserveState && this.objects != null) {
                previousSelection = this.SelectedObjects;
                OLVListItem focusedItem = this.FocusedItem as OLVListItem;
                if (focusedItem != null)
                    previousFocus = focusedItem.RowObject;
            }

            IEnumerable objectsToDisplay = this.FilteredObjects;

            this.BeginUpdate();
            try {
                this.Items.Clear();
                this.ListViewItemSorter = null;

                if (objectsToDisplay != null) {
                    // Build a list of all our items and then display them. (Building
                    // a list and then doing one AddRange is about 10-15% faster than individual adds)
                    int rowNo = 1;
                    List<ListViewItem> itemList = new List<ListViewItem>(); // use ListViewItem to avoid co-variant conversion
                    foreach (object rowObject in objectsToDisplay) {
                        OLVListItem lvi = new OLVListItem(rowObject);
                        this.FillInValues(lvi, rowObject);
                        if (this.GetColumn(0).IsRowNumberColumn)
                        {
                            lvi.GetSubItem(0).Text = (rowNo++).ToString();
                        }
                        itemList.Add(lvi);
                    }
                    this.Items.AddRange(itemList.ToArray());
                    this.Sort();

                    if (shouldPreserveState) {
                        this.SelectedObjects = previousSelection;
                        this.FocusedItem = this.ModelToItem(previousFocus);
                    }

                    this.RefreshHotItem();
                }
            } finally {
                this.EndUpdate();
            }

            // We can only restore the scroll position after the EndUpdate() because
            // of caching that the ListView does internally during a BeginUpdate/EndUpdate pair.
            if (shouldPreserveState) {
                this.RefreshHotItem();

                // Restore the scroll position. TopItemIndex is best, but doesn't work
                // when the control is grouped.
                if (this.ShowGroups)
                    this.LowLevelScroll(currentScrollPosition.X, currentScrollPosition.Y);
                else
                    this.TopItemIndex = previousTopIndex;
            }

            System.Diagnostics.Debug.WriteLine(String.Format("PERF - Building list for {2} objects took {0}ms / {1} ticks", sw.ElapsedMilliseconds, sw.ElapsedTicks, this.GetItemCount()));
        }