C# objectlistview 在单元格编辑器中未定义的偏移量

Posted 2023-02-23

【中文标题】C# objectlistview 在单元格编辑器中未定义的偏移量

【英文标题】：C# objectlistview undefined offset in cell editor

【发布时间】：2017-05-12 19:57:59

【问题描述】：

我使用来自ObjectListView 库的TreeListView 组件。我使单元格值可编辑，当我双击它们时，TextBox 将出现奇数偏移。 我想移除这个偏移量，但是怎么做呢？

开始编辑之前

开始编辑后

如您所见，第一行第二列（“我的新设备”）TextBox 出现偏移。

附：按预期编辑工作。只有偏移量让我很烦

附言如您所见，偏移量取决于第一列偏移量。我怎样才能将其更改为零？

【参考方案1】：

经过长时间的搜索，我找到了解决方案！

OLV源码，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。

源文件中的这个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，附加到每个单元格的偏移量（不仅仅是第一个）。我们也可以看到，CellEditEventArgs 包含CellBounds。

所以我们可以将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;
            
        
//...

【讨论】：

感谢您的帮助。 objectList 的奇怪行为。这是功能的错误？

我认为，它的错误。但最好问问开发人员

【参考方案2】：

该问题在 OLV v2.9.1 中仍然存在。我的解决方法与 muzagursiy 的做法略有不同。

        olv.CellEditStarting += (sender, args) =>
        
            // Left align the edit control
            args.Control.Location = args.CellBounds.Location;

            // Readjust the size of the control to fill the whole cell if CellEditUseWholeCellEffective is enabled
            if (args.Column.CellEditUseWholeCellEffective)
            
                args.Control.Size = args.CellBounds.Size;
            

        ;