Question

我可以通过编程方式设置WPF ListBox滚动条的位置吗？默认情况下，我希望它在中心。

Answer 1

要在ListBox中移动垂直滚动条，请执行以下操作：

命名您的列表框（x：Name =“myListBox”）
为Window添加Loaded事件（Loaded =“Window_Loaded”）
使用方法实现Loaded事件：ScrollToVerticalOffset

以下是一份工作样本：

XAML：

<Window x:Class="ListBoxScrollPosition.Views.MainView"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Loaded="Window_Loaded"
  Title="Main Window" Height="100" Width="200">
  <DockPanel>
    <Grid>
      <ListBox x:Name="myListBox">
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
        <ListBoxItem>Zamboni</ListBoxItem>
      </ListBox>
    </Grid>
  </DockPanel>
</Window>

C＃

private void Window_Loaded(object sender, RoutedEventArgs e)
{
  // Get the border of the listview (first child of a listview)
  Decorator border = VisualTreeHelper.GetChild(myListBox, 0) as Decorator;
  if (border != null)
  {
    // Get scrollviewer
    ScrollViewer scrollViewer = border.Child as ScrollViewer;
    if (scrollViewer != null)
    {
      // center the Scroll Viewer...
      double center = scrollViewer.ScrollableHeight / 2.0;
      scrollViewer.ScrollToVerticalOffset(center);
    }
  }
}

Answer 2

Dim cnt as Integer = myListBox.Items.Count
Dim midPoint as Integer = cnt\2
myListBox.ScrollIntoView(myListBox.Items(midPoint))

或

myListBox.SelectedIndex = midPoint

这取决于您是否想要显示或选择中间项目。

Answer 3

我刚刚更改了Zamboni的一些代码并添加了位置计算。

var border = VisualTreeHelper.GetChild(list, 0) as Decorator;
if (border == null) return;
var scrollViewer = border.Child as ScrollViewer;
if (scrollViewer == null) return;
scrollViewer.ScrollToVerticalOffset((scrollViewer.ScrollableHeight/list.Items.Count)*
                                    (list.Items.IndexOf(list.SelectedItem) + 1));

Answer 4

我有一个名为MusicList的ListView。播放音乐后，MusicList会自动移至下一个元素。我为Player.Ended事件创建一个事件处理程序，如下所示（la Zamboni）：

$scope.printRepayment = function() {
    var documentDefinition = generatePDF();                                     pdfMake.createPdf(documentDefinition).print();
      }



var generatePDF = function() {
            var repayments = $scope.repayments;
            var rows = [
              [
                { text: "Payment No", style: "tableHeader" },
                { text: "Installment", style: "tableHeader" },
              ]
            ];
            for (var i = 0; i < repayments.length; i++) {
              rows.push([
                { text: i + 1, style: "tablefirst" },
                {
                  text:
                    "AED " +
                    numberWithCommas(
                      parseFloat(repayments[i].installment).toFixed(2)
                    ),
                  style: "tableOther"
                },
              ]);
            }
            return {
              content: [
                { text: "Repayment schedule", style: "subheader" },
                {
                  style: "tableExample",
                  table: {
                    widths: ["*", "*", "*", "*", "*"],
                    body: rows
                  },
                  layout: {
                    vLineColor: function(i, node) {
                      return "#ECF3FE";
                    }
                  }
                }
              ],
              styles: {
                tabletop: {
                  margin: [10, 0, 0, 10]
                },
                tabletopHeader: {
                  fontSize: 16,
                  bold: true
                }
              }
            };
          };

您将在底部看到下一个元素。

Answer 5

我不认为ListBox有这个，但ListViews有EnsureVisible方法将滚动条移动到所需的位置，以确保显示一个项目。

设置ListBox的滚动条位置

5 个答案: