WPF隨筆收錄-DataGrid固定右側列

流浪g發表於2024-04-17

一、前言

在專案開發過程中,DataGrid是經常使用到的一個資料展示控制元件,而通常表格的最後一列是作為操作列存在,比如會有編輯、刪除等功能按鈕。但WPF的原始DataGrid中,預設只支援固定左側列,這跟大家習慣性操作列放最後不符,今天就來介紹一種簡單的方式實現固定右側列。(這裡的實現方式參考的大佬的兩個DataGrid合併在一起的方式,原部落格:https://www.cnblogs.com/akwkevin/p/17872348.html

二、正文

1、上面大佬的實現,就直接基於他自己的控制元件庫裡實現的,這裡我介紹的方式是如何引用了別的第三方庫的情況下,在專案程式碼中再實現自定義可以固定右側列的DataGrid控制元件;

2、首先新建個專案,專案裡引用了HandyControl控制元件庫和微軟的mvvm庫。

3、給專案新增一個自定義控制元件,記得不是自定義使用者控制元件,這裡命名為MyDataGrid,然後就可以從上面大佬那裡搬程式碼過來,關鍵就是新增RightFrozenCount這個依賴屬性程式碼和兩個DataGrid之間的滾動同步程式碼

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);
        }
    }
}
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、接著去到HandyControl的開源庫那裡,找到DataGrid的樣式,然後複製到專案中

5、然後對原來的Style進行修改,對ControlTemplate的佈局新增上作為固定列的DataGrid

6、至此,自定義支援右側列固定的DataGrid就完成了,效果如下:

7、程式碼地址:https://gitee.com/liulang_g/data-grid-demo

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