C# objectlistview 单元格编辑器中 undefined offset

Question

我使用 ObjectListView 库中的 TreeListView 组件。我使单元格值可编辑，当我双击它们时 TextBox 将以奇数偏移量出现。 我想删除这个偏移量，但是如何删除呢？

开始编辑之前

开始编辑后

正如您所看到的第一行、第二列(“我的新设备”)，TextBox 显示有偏移。

附注编辑工作按预期进行。只有偏移量让我很烦

P.P.S。正如您所看到的，偏移量取决于第一列偏移量。我怎样才能将其更改为零？

Answer 1

经过长时间的搜索，我找到了解决方案!

OLV源代码，ObjectListView.cs

public virtual void StartCellEdit(OLVListItem item, int subItemIndex) {
            OLVColumn column = this.GetColumn(subItemIndex);
            Control c = this.GetCellEditor(item, subItemIndex);
            Rectangle cellBounds = this.CalculateCellBounds(item, subItemIndex);
            c.Bounds = this.CalculateCellEditorBounds(item, subItemIndex, c.PreferredSize);

            // Try to align the control as the column is aligned. Not all controls support this property
            Munger.PutProperty(c, "TextAlign", column.TextAlign);

            // Give the control the value from the model
            this.SetControlValue(c, column.GetValue(item.RowObject), column.GetStringValue(item.RowObject));

            // Give the outside world the chance to munge with the process
            this.CellEditEventArgs = new CellEditEventArgs(column, c, cellBounds, item, subItemIndex);
            this.OnCellEditStarting(this.CellEditEventArgs);
            if (this.CellEditEventArgs.Cancel)
                return;

            // The event handler may have completely changed the control, so we need to remember it
            this.cellEditor = this.CellEditEventArgs.Control;

            this.Invalidate();
            this.Controls.Add(this.cellEditor);
            this.ConfigureControl();
            this.PauseAnimations(true);
        }

我看到 CellEditEventArgs 包含 Control，它在名为 Bounds 的区域中绘制。

源文件中的此函数将偏移量附加到控件的边界:

protected Rectangle CalculateCellEditorBoundsStandard(OLVListItem item, int subItemIndex, Rectangle cellBounds, Size preferredSize) {
            if (this.View == View.Tile)
                return cellBounds;

            // Center the editor vertically
            if (cellBounds.Height != preferredSize.Height)
                cellBounds.Y += (cellBounds.Height - preferredSize.Height) / 2;

            // Only Details view needs more processing
            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;
        }

我们可以看到，该偏移量附加到每个单元格(不仅仅是第一个单元格)。我们还可以看到，CellEditEventArgs 包含CellBounds。

因此我们可以将 Control.Bounds 重置为 CellBounds 值:

//...
dataTreeView.CellEditStarting += DisableInputValueForCollections;
//...
        private static void DisableInputValueForCollections(object sender, CellEditEventArgs e)
        {
            RemoveExtraOffsetForNotFirstColumnInputControl(e);
            var node = e.RowObject as DataTreeNode;

            if (node != null && e.Column.AspectName == "Value")
            {
                if (node.IsContainer()) e.Cancel = true;
            }
        }
//...
private static void RemoveExtraOffsetForNotFirstColumnInputControl(CellEditEventArgs e)
        {
            if (e.Column.AspectName != "Name")
            {
                e.Control.Bounds = e.CellBounds;
            }
        }
//...