Recently, I encountered an item without mouse on the device. The interface is a DataGrid with full screen. It needs to scroll up and down the currently selected row of DataGrid by pressing 0 and 1 of the keypad
For important reference, https://blog.csdn.net/sinat_/article/details/105428496 implements background scrolling to the currently selected item.
Now take a note of the main implementation:
First of all, the front desk must be set with virtualizing StackPanel. Isvirtualizing = "false"
Next, there are two common methods:
/// <summary> /// take SelectedItem Scroll to first line /// </summary> /// <param name="dataGrid">target DagaGrid</param> /// <param name="selectedItem">Checked items</param> public static void SetSelectedItemFirstRow(object dataGrid, object selectedItem) { //If target datagrid Empty, throw exception if (dataGrid == null) { throw new ArgumentNullException("Target none" + dataGrid + "Cannot convert to DataGrid"); } //Get target DataGrid，If it is empty, an exception will be thrown System.Windows.Controls.DataGrid dg = dataGrid as System.Windows.Controls.DataGrid; if (dg == null) { throw new ArgumentNullException("Target none" + dataGrid + "Cannot convert to DataGrid"); } //If the data source is empty, return if (dg.Items == null || dg.Items.Count < 1) { return; } //Get focus, scroll to target line dg.Focus(); dg.SelectedItem = selectedItem; dg.CurrentColumn = dg.Columns[0]; dg.ScrollIntoView(dg.SelectedItem, dg.CurrentColumn); } /// <summary> /// Get selected row /// </summary> /// <param name="datagrid"></param> /// <param name="rowIndex"></param> /// <returns></returns> 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; }
Then, add a KeyDown event for the form:
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!