作者:wy | 来源:互联网 | 2023-10-11 09:12
篇首语:本文由编程笔记#小编为大家整理,主要介绍了WPF 后台实现按数字键滚动DataGrid 当前选中项相关的知识,希望对你有一定的参考价值。
最近遇到个项目,设备上没有鼠标,界面为全屏的一个DataGrid,需要实现按小键盘的0和1让DataGrid的当前选中行进行上下滚动
起到重要参考的是: https://blog.csdn.net/sinat_31608641/article/details/105428496 实现后台滚动到当前选中项。
现在把主要实现方式做个笔记:
首先,前台一定要设置VirtualizingStackPanel.IsVirtualizing="False"
接下来,是两个公共方法:
///
/// 将SelectedItem滚动为第一行
///
/// 目标DagaGrid
/// 选中项
public static void SetSelectedItemFirstRow(object dataGrid, object selectedItem)
{
//若目标datagrid为空,抛出异常
if (dataGrid == null)
{
throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");
}
//获取目标DataGrid,为空则抛出异常
System.Windows.Controls.DataGrid dg = dataGrid as System.Windows.Controls.DataGrid;
if (dg == null)
{
throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");
}
//数据源为空则返回
if (dg.Items == null || dg.Items.Count <1)
{
return;
}
//获取焦点,滚动为目标行
dg.Focus();
dg.SelectedItem = selectedItem;
dg.CurrentColumn = dg.Columns[0];
dg.ScrollIntoView(dg.SelectedItem, dg.CurrentColumn);
}
///
/// 获取选中的行
///
///
///
///
public static DataGridRow GetDataGridRow(DataGrid datagrid, int rowIndex)
{
DataGridRow row = (DataGridRow)datagrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
if (row == null)
{
datagrid.UpdateLayout();
row = (DataGridRow)datagrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);
row.IsSelected = true;
}
return row;
}
然后,添加一个窗体的KeyDown事件:
private void UserControl_KeyDown(object sender, KeyEventArgs e)
{
dgvDeal.Focus();
if (e.Key==Key.NumPad0)
{
if (dgvDeal.SelectedIndex == dgvDeal.Items.Count-1)
{
dgvDeal.SelectedIndex = 0;
}
else
{
dgvDeal.SelectedIndex = dgvDeal.SelectedIndex + 1;
}
}
else if (e.Key == Key.NumPad1)
{
if (dgvDeal.SelectedIndex == 0)
{
dgvDeal.SelectedIndex = dgvDeal.Items.Count-1;
}
else
{
dgvDeal.SelectedIndex = dgvDeal.SelectedIndex - 1;
}
}
DataGridRow resRow = GetDataGridRow(dgvDeal, dgvDeal.SelectedIndex);
resRow.IsSelected = true;
SetSelectedItemFirstRow(dgvDeal, dgvDeal.SelectedItem);
}
OK!