Question

我希望能够在用户执行mousedown时触发事件一个网格。（就像用户点击网格而不是点击一样的视觉反馈！）

我有这个XAML代码：

// Save the stylesheet formats
stylesPart.Stylesheet.Save();

// Create custom widths for columns
Columns lstColumns = worksheetPart.Worksheet.GetFirstChild<Columns>();
Boolean needToInsertColumns = false;
if (lstColumns == null)
{
    lstColumns = new Columns();
    needToInsertColumns = true;
}
// Min = 1, Max = 1 ==> Apply this to column 1 (A)
// Min = 2, Max = 2 ==> Apply this to column 2 (B)
// Width = 25 ==> Set the width to 25
// CustomWidth = true ==> Tell Excel to use the custom width
lstColumns.Append(new Column() { Min = 1, Max = 1, Width = 25, CustomWidth = true });
lstColumns.Append(new Column() { Min = 2, Max = 2, Width = 9, CustomWidth = true });
lstColumns.Append(new Column() { Min = 3, Max = 3, Width = 9, CustomWidth = true });
lstColumns.Append(new Column() { Min = 4, Max = 4, Width = 9, CustomWidth = true });
lstColumns.Append(new Column() { Min = 5, Max = 5, Width = 13, CustomWidth = true });
lstColumns.Append(new Column() { Min = 6, Max = 6, Width = 17, CustomWidth = true });
lstColumns.Append(new Column() { Min = 7, Max = 7, Width = 12, CustomWidth = true });
// Only insert the columns if we had to create a new columns element
if (needToInsertColumns)
    worksheetPart.Worksheet.InsertAt(lstColumns, 0);

// Get the sheetData cells
SheetData sheetData = worksheetPart.Worksheet.GetFirstChild<SheetData>();

这是在c＃类：

 <Grid.Triggers>
    <EventTrigger Event="MouseDown">
        <local:MouseOver/>
    </EventTrigger>
</Grid.Triggers>

即使课程正确实施，我仍然无法参加活动！我还尝试了public class MouseOver : TriggerAction<Entry> { protected async override void Invoke(Entry entry) { //Some animation code here } }和"IsMouseOver"作为事件，但似乎没有任何效果。我希望有人能帮助我...... 谢谢你的帮助！

Answer 1

EventTrigger仅适用于Grid类（或其中一个超类）上存在的事件。在XForms中，没有任何鼠标事件，因为它主要是为触摸界面设计的。

要向控件添加点按处理，我可以通过向控件上的TapGestureRecognizer集合添加GestureRecognizers来完成XForms。

// In C#
var tapGestureRecognizer = new TapGestureRecognizer();
tapGestureRecognizer.Tapped += (s, e) => {
    // handle the tap
};
image.GestureRecognizers.Add(tapGestureRecognizer);

// In XAML
<Grid Source="tapped.jpg">
    <Grid.GestureRecognizers>
        <TapGestureRecognizer
                Tapped="OnTapGestureRecognizerTapped"
                NumberOfTapsRequired="2" />
  </Grid.GestureRecognizers>
</Grid>

您可以在XForms docs。

中阅读

我用什么事件来触发像XAML中的mousedown（XamarinForms）

1 个答案: