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Make pie chart's selected value available to developers #7

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Make pie chart's selected value available to developers #7

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62 changes: 60 additions & 2 deletions QuickChartsWPF/PieChart.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,24 @@ public string ValueMemberPath
set { SetValue(ValueMemberPathProperty, value); }
}

/// <summary>
/// Identifies <see cref="UserDataMemberPath"/> dependency property.
/// </summary>
public static readonly DependencyProperty UserDataMemberPathProperty = DependencyProperty.Register(
"UserDataMemberPath", typeof(string), typeof(PieChart),
new PropertyMetadata(null, new PropertyChangedCallback(PieChart.OnMemberPathPropertyChanged))
);

/// <summary>
/// Gets or sets path to the member in the datasource holding user-specific data for the slice.
/// This is a dependency property.
/// </summary>
public string UserDataMemberPath
{
get { return (string)GetValue(UserDataMemberPathProperty); }
set { SetValue(UserDataMemberPathProperty, value); }
}

private static void OnMemberPathPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
PieChart chart = d as PieChart;
Expand All @@ -152,6 +170,8 @@ private static void OnMemberPathPropertyChanged(DependencyObject d, DependencyPr

private List<string> _titles = new List<string>();
private List<double> _values = new List<double>();
private List<object> _userData = new List<object>();

private double _total;

private void ProcessData()
Expand All @@ -165,6 +185,7 @@ private void ProcessData()
{
_titles.Clear();
_values.Clear();
_userData.Clear();
_total = 0;
}
//InvalidateArrange();
Expand All @@ -175,20 +196,27 @@ private void SetData()
{
_titles.Clear();
_values.Clear();
_userData.Clear();

if (!string.IsNullOrEmpty(TitleMemberPath) && !string.IsNullOrEmpty(ValueMemberPath))
{
BindingEvaluator titleEval = new BindingEvaluator(TitleMemberPath);
BindingEvaluator valueEval = new BindingEvaluator(ValueMemberPath);
BindingEvaluator userDataEval = new BindingEvaluator(UserDataMemberPath);

foreach (object dataItem in this.DataSource)
{
_titles.Add(titleEval.Eval(dataItem).ToString());
_values.Add((double)valueEval.Eval(dataItem));
_userData.Add(userDataEval.Eval(dataItem));

if (dataItem is INotifyPropertyChanged)
{
(dataItem as INotifyPropertyChanged).PropertyChanged -= OnDataSourceItemPropertyChanged;
(dataItem as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(OnDataSourceItemPropertyChanged);
}
}

_total = _values.Sum();
}
}
Expand Down Expand Up @@ -266,6 +294,8 @@ private void AddSlices()
Slice slice = new Slice();
slice.RenderTransform = new RotateTransform();
slice.RenderTransformOrigin = new Point(0, 0);
slice.Tag = _userData[i];

_slices.Add(slice);
#if WINDOWS_PHONE
slice.ManipulationStarted += new EventHandler<ManipulationStartedEventArgs>(OnSliceManipulationStarted);
Expand All @@ -280,14 +310,41 @@ private void AddSlices()

#if WINDOWS_PHONE
private bool isSliceEvent = false;

void OnSliceManipulationStarted(object sender, ManipulationStartedEventArgs e)
{
GeneralTransform gt = (sender as Slice).TransformToVisual(_sliceCanvasDecorator);
DisplayBalloon(sender as Slice, gt.Transform(e.ManipulationOrigin));
var slice = sender as Slice;

SelectedUserData = slice.Tag;

GeneralTransform gt = slice.TransformToVisual(_sliceCanvasDecorator);
DisplayBalloon(slice, gt.Transform(e.ManipulationOrigin));
//e.Handled = true;
isSliceEvent = true;
}

/// <summary>
/// The currently selected value.
/// </summary>
public static readonly DependencyProperty SelectedUserDataDependencyProperty =
DependencyProperty.Register("SelectedUserData", typeof (object), typeof (PieChart), new PropertyMetadata(null));

/// <summary>
/// Gets the selected value. The selected value represents the user-specific data. This is a dependency property.
/// </summary>
public object SelectedUserData
{
get
{
return (object) GetValue(SelectedUserDataDependencyProperty);
}

set
{
SetValue(SelectedUserDataDependencyProperty, value);
}
}

/// <summary>
/// Reacts to touch manipulations.
/// </summary>
Expand Down Expand Up @@ -464,6 +521,7 @@ private void DisplayBalloon(Slice slice, Point position)
_balloon.Text = slice.ToolTipText;
_balloon.Visibility = Visibility.Visible;
_balloon.Measure(new Size(_sliceCanvasDecorator.ActualWidth, _sliceCanvasDecorator.ActualHeight));

double balloonLeft = position.X - _balloon.DesiredSize.Width / 2;
if (balloonLeft < 0)
{
Expand Down