Question

I am trying to determine which row (RowDefinition) my mouse is over within a WPF grid.

I have tried adding the MouseEnter event to the RowDefinition but the event doesn’t fire, the Event does fire on the Grid itself but that doesn’t help as I need the name of the row the mouse is currently over.

Thanks in advance.

Answer 1

Have your handler on each element, not on the grid itself. E.g. if you have TextBlocks there you can set handler using style:

<Grid Name="_grid">
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
    </Grid.RowDefinitions>
    <Grid.Resources>
        <Style TargetType="TextBlock">
            <EventSetter Event="MouseEnter" Handler="EventSetter_OnHandler" />
        </Style>
    </Grid.Resources>
        <TextBlock>a</TextBlock>
        <TextBlock Grid.Row="1">b</TextBlock>
        <TextBlock Grid.Row="2">c</TextBlock>
</Grid>

Then within handler you know the element from MouseEventArgs.Source. Do GetValue(Grid.RowProperty) if you need to find out row number and if you really need RowDefinition, get it from Grid.RowDefinitions:

private void EventSetter_OnHandler(object sender, MouseEventArgs e)
{
    var element = (FrameworkElement) e.Source;
    var rowNumber = (int) element.GetValue(Grid.RowProperty);
    RowDefinition rowDefinition = _grid.RowDefinitions[rowNumber];
    e.Handled = true;
}