Silverlight 3.0 Custom Cursor in Chart
- by Wonko the Sane
Hello All,
I'm probably overlooking something that will be obvious when I see the solution, but for now...
I am attempting to use a custom cursor inside the chart area of a Toolkit chart. I have created a ControlTemplate for the chart, and a grid to contain the cursors. I show/hide the cursors, and attempt to move the containing Grid, using various Mouse events. The cursor is being displayed at the correct times, but I cannot get it to move to the correct position.
Here is the ControlTemplate (the funky colors are just attempts to confirm what the different pieces of the template pertain to):
<dataVisTK:Title Content="{TemplateBinding Title}"
Style="{TemplateBinding TitleStyle}"/>
<Grid Grid.Row="1">
<!-- Remove the Legend -->
<!--<dataVisTK:Legend
x:Name="Legend"
Title="{TemplateBinding LegendTitle}"
Style="{TemplateBinding LegendStyle}"
Grid.Column="1"/>-->
<chartingPrimitivesTK:EdgePanel x:Name="ChartArea"
Background="#EDAEAE"
Style="{TemplateBinding ChartAreaStyle}"
Grid.Column="0">
<Grid Canvas.ZIndex="-1"
Background="#2008AE"
Style="{TemplateBinding PlotAreaStyle}">
</Grid>
<Border Canvas.ZIndex="1"
BorderBrush="#FF250010"
BorderThickness="3" />
<Grid x:Name="gridHandCursors"
Canvas.ZIndex="5"
Width="32" Height="32"
Visibility="Collapsed">
<Image x:Name="cursorGrab" Width="32"
Source="Resources/grab.png" />
<Image x:Name="cursorGrabbing" Width="32"
Source="Resources/grabbing.png"
Visibility="Collapsed"/>
</Grid>
</chartingPrimitivesTK:EdgePanel>
</Grid>
</Grid>
</Border>
and here are the mouse events (in particular, the MouseMove):
void TimelineChart_Loaded(object sender, RoutedEventArgs e)
{
chartTimeline.UpdateLayout();
List<FrameworkElement> chartChildren = GetLogicalChildrenBreadthFirst(chartTimeline).ToList();
mChartArea =
chartChildren.Where(element => element.Name.Equals("ChartArea")).FirstOrDefault() as Panel;
if (mChartArea != null)
{
grabCursor = chartChildren.Where(element => element.Name.Equals("cursorGrab")).FirstOrDefault() as Image;
grabbingCursor = chartChildren.Where(element => element.Name.Equals("cursorGrabbing")).FirstOrDefault() as Image;
mGridHandCursors =
chartChildren.Where(element => element.Name.Equals("gridHandCursors")).FirstOrDefault() as Grid;
mChartArea.Cursor = Cursors.None;
mChartArea.MouseMove += new MouseEventHandler(mChartArea_MouseMove);
mChartArea.MouseLeftButtonDown += new MouseButtonEventHandler(mChartArea_MouseLeftButtonDown);
mChartArea.MouseLeftButtonUp += new MouseButtonEventHandler(mChartArea_MouseLeftButtonUp);
if (mGridHandCursors != null)
{
mChartArea.MouseEnter += (s, e2) =>
mGridHandCursors.Visibility = Visibility.Visible;
mChartArea.MouseLeave += (s, e2) =>
mGridHandCursors.Visibility = Visibility.Collapsed;
}
}
}
void mChartArea_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (grabCursor != null)
grabCursor.Visibility = Visibility.Visible;
if (grabbingCursor != null)
grabbingCursor.Visibility = Visibility.Collapsed;
}
void mChartArea_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (grabCursor != null)
grabCursor.Visibility = Visibility.Collapsed;
if (grabbingCursor != null)
grabbingCursor.Visibility = Visibility.Visible;
}
void mChartArea_MouseMove(object sender, MouseEventArgs e)
{
if (mGridHandCursors != null)
{
Point pt = e.GetPosition(null);
mGridHandCursors.SetValue(Canvas.LeftProperty, pt.X);
mGridHandCursors.SetValue(Canvas.TopProperty, pt.Y);
}
}
Any help past this roadblock would be greatly appreciated!
Thanks,
wTs
