public void OnLegendClick(KSeries[] legend, KSeries series)
{
if (guiControls.IsShiftDown())
{
KChartHandler.ShiftInvertVisible(series.name);
foreach (var seriesI in legend)
{
seriesI.lineButton.SetLegendImage(seriesI);
}
}
else
{
KChartHandler.InvertVisible(series.name);
series.lineButton.SetLegendImage(series); // accessing the shared series data structure!
}
KChartHandler.VisibilityRemember();
KChartHandler.ChartUpdate(null); // cannot provide style: would have to marshall it throug KGui but is ok to update
}
public CollectionView LegendView()
{
CollectionView collectionView = new CollectionView()
{
//ItemsLayout = ListItemsLayout.VerticalList, // can also be set to a vertical grid
ItemsLayout = new GridItemsLayout(2, ItemsLayoutOrientation.Vertical),
SelectionMode = SelectionMode.Single,
};
// collectionView.SetBinding(ItemsView.ItemsSourceProperty, "Monkeys"); // a binding for the ItemSource, but we give keep regenerating it
collectionView.ItemsSource = new ObservableCollection <LegendItem>(); // CollectionView contains LegendItems with bindings set in ItemTemplate
collectionView.ItemTemplate = new DataTemplate(() => { // CollectionView contains LegendItems with bindings set in ItemTemplate
Grid grid = new Grid {
Padding = 2
};
grid.RowDefinitions.Add(new RowDefinition {
Height = new GridLength(LegendItemHeight)
});
grid.ColumnDefinitions.Add(new ColumnDefinition {
Width = GridLength.Auto
});
grid.ColumnDefinitions.Add(new ColumnDefinition {
Width = GridLength.Auto
});
// grid.ColumnDefinitions.Add(new ColumnDefinition { Width = 50 }); //it is definitely labels that flash a gray box when updated
BoxView box = new BoxView {
VerticalOptions = LayoutOptions.Center, HorizontalOptions = LayoutOptions.Center
}; // needed, otherwise the default .Fill option ignores HeightRequest
box.SetBinding(BoxView.ColorProperty, "Color"); // property of LegendItem
box.SetBinding(BoxView.HeightRequestProperty, "Height"); // property of LegendItem
box.SetBinding(BoxView.WidthRequestProperty, "Width"); // property of LegendItem
Label nameLabel = new Label {
FontSize = LegendFontSize, FontAttributes = FontAttributes.Bold
};
nameLabel.SetBinding(Label.TextProperty, "Name"); // property of LegendItem
grid.Children.Add(box, 0, 0);
grid.Children.Add(nameLabel, 1, 0);
// grid.Children.Add(new Label { Text = "xxx" }, 2, 0); //it is definitely labels that flash a gray box when updated
return(grid);
});
collectionView.SelectionChanged += (object sender, SelectionChangedEventArgs args) => {
LegendItem item = collectionView.SelectedItem as LegendItem;
if (item != null)
{
KChartHandler.InvertVisible(item.Name);
KChartHandler.VisibilityRemember();
KChartHandler.ChartUpdate(null);
KGui.gui.GuiLegendUpdate();
collectionView.SelectedItem = null; // avoid some visible flashing of the selection
}
};
return(collectionView);
}