WPF随笔收录-DataGrid固定右侧列

一、前言

在项目开发过程中,DataGrid是经常使用到的一个数据展示控件,而通常表格的最后一列是作为操作列存在,比如会有编辑、删除等功能按钮。但WPF的原始DataGrid中,默认只支持固定左侧列,这跟大家习惯性操作列放最后不符,今天就来介绍一种简单的方式实现固定右侧列。(这里的实现方式参考的大佬的两个DataGrid合并在一起的方式,原博客:https://www.cnblogs.com/akwkevin/p/17872348.html

二、正文

1、上面大佬的实现,就直接基于他自己的控件库里实现的,这里我介绍的方式是如何引用了别的第三方库的情况下,在项目代码中再实现自定义可以固定右侧列的DataGrid控件;

2、首先新建个项目,项目里引用了HandyControl控件库和微软的mvvm库。

3、给项目添加一个自定义控件,记得不是自定义用户控件,这里命名为MyDataGrid,然后就可以从上面大佬那里搬代码过来,关键就是添加RightFrozenCount这个依赖属性代码和两个DataGrid之间的滚动同步代码

复制代码
public int RightFrozenCount
{
    get { return (int)GetValue(RightFrozenCountProperty); }
    set { SetValue(RightFrozenCountProperty, value); }
}

public static readonly DependencyProperty RightFrozenCountProperty =
    DependencyProperty.Register(nameof(RightFrozenCount), typeof(int), typeof(MyDataGrid),
        new PropertyMetadata(0, OnRightFrozenCountChanged));

private static void OnRightFrozenCountChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    if (d is MyDataGrid dataGridRightFrozen)
    {
        dataGridRightFrozen.OnRightFrozenCountChanged();
    }
}

private void OnRightFrozenCountChanged()
{
    if (_rightDataGrid != null)
    {
        if (RightFrozenCount > 0)
        {
            for (int i = 0; i < _rightDataGrid.Columns.Count; i++)
            {
                var column = _rightDataGrid.Columns[i];
                _rightDataGrid.Columns.Remove(column);
                Columns.Add(column);
            }
            for (int i = 0; i < RightFrozenCount; i++)
            {
                var last = Columns[^1];
                Columns.Remove(last);

                _rightDataGrid.Columns.Insert(0, last);
            }
            _rightDataGrid.SetCurrentValue(VisibilityProperty, Visibility.Visible);
        }
        else
        {
            _rightDataGrid.SetCurrentValue(VisibilityProperty, Visibility.Collapsed);
        }
    }
}
复制代码
public override void OnApplyTemplate()
{
    base.OnApplyTemplate();
    if (_scrollViewer != null)
    {
        _scrollViewer.ScrollChanged -= ScrollViewer_ScrollChanged;
    }
    if (_rightScrollViewer != null)
    {
        _rightScrollViewer.ScrollChanged -= RightScrollViewer_ScrollChanged;
    }
    if (_rightDataGrid != null)
    {
        _rightDataGrid.ScrollViewerChanged -= ScrollViewerChanged;
        _rightDataGrid.SelectionChanged -= RightDataGrid_SelectionChanged;
    }

    _scrollViewer = GetTemplateChild(DG_ScrollViewer) as ScrollViewer;
    if (_scrollViewer != null)
    {
        _scrollViewer.ScrollChanged += ScrollViewer_ScrollChanged;
    }

    _rightDataGrid = GetTemplateChild(PART_Right) as DataGridScrollView;
    if (_rightDataGrid != null)
    {
        _rightDataGrid.ScrollViewerChanged += ScrollViewerChanged;
        _rightDataGrid.SelectionChanged += RightDataGrid_SelectionChanged;
    }
    SelectionChanged += DataGridRightFrozen_SelectionChanged;
}

private void ScrollViewerChanged(ScrollViewer viewer)
{
    _rightScrollViewer = viewer;
    _rightScrollViewer.ScrollChanged += RightScrollViewer_ScrollChanged;
}

private void ScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
    _rightScrollViewer?.ScrollToVerticalOffset(_scrollViewer.VerticalOffset);
}

private void RightScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
    _scrollViewer?.ScrollToVerticalOffset(_rightScrollViewer.VerticalOffset);
}

private void RightDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    SetCurrentValue(SelectedItemProperty, _rightDataGrid.SelectedItem);
}

private void DataGridRightFrozen_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    _rightDataGrid.SetCurrentValue(SelectedItemProperty, SelectedItem);
}

4、接着去到HandyControl的开源库那里,找到DataGrid的样式,然后复制到项目中

5、然后对原来的Style进行修改,对ControlTemplate的布局添加上作为固定列的DataGrid

6、至此,自定义支持右侧列固定的DataGrid就完成了,效果如下:

7、代码地址:https://gitee.com/liulang_g/data-grid-demo