/// <summary>
/// Called to fire an ItemFocusChanging event.
/// </summary>
/// <param name="oldItem">The item that was previously focused.</param>
/// <param name="newItem">The item that is gaining focus.</param>
private void FireItemFocusChanging(PieChartItem oldItem, PieChartItem newItem)
{
if (ItemFocusChanging != null)
{
ItemFocusChanging(this, new PieChartItemFocusEventArgs(oldItem, newItem));
}
}
/// <summary>
/// Called to fire an ItemDoubleClicked event.
/// </summary>
/// <param name="item">The event arguments.</param>
private void FireItemDoubleClicked(PieChartItem item)
{
if (ItemDoubleClicked != null)
{
ItemDoubleClicked(this, new PieChartItemEventArgs(item));
}
}
/// <summary>
/// Constructs a new DrawingMetrics.
/// </summary>
/// <param name="control">The control this object is associated with.</param>
/// <param name="item">The item this object is associated with.</param>
/// <param name="startAngle">The start angle of this pie slice, in radians.</param>
/// <param name="sweepAngle">The sweep angle of this pie slice, in radians.</param>
public DrawingMetrics(PieChart control, PieChartItem item, Rectangle drawingBounds, float startAngle, float sweepAngle)
{
this.control = control;
this.item = item;
this.drawingBounds = drawingBounds;
this.startAngle = (float)(startAngle % (2 * Math.PI));
this.sweepAngle = sweepAngle;
ConstructGraphics();
ConstructPaths();
ConstructRegions();
}
/// <summary>
/// Gets the display text for a PieChartItem in the collection list.
/// </summary>
/// <param name="value">The PieChartItem to get the display text for.</param>
/// <returns>The string that will be displayed for the PieChartItem.</returns>
protected override string GetDisplayText(object value)
{
if (value is PieChartItem)
{
PieChartItem item = (PieChartItem)value;
if (!string.IsNullOrEmpty(item.Text))
{
return(string.Format("{0} [weight {1:f3}]", item.Text, item.Weight));
}
else
{
return(string.Format("[weight {0:f3}]", item.Weight));
}
}
return(value.GetType().Name);
}
/// <summary>
/// Converts the given value object to the specified type, using the specified context and culture information.
/// </summary>
/// <param name="context">An ITypeDescriptorContext that provides a format context.</param>
/// <param name="culture">A CultureInfo. If a null reference is passed, the current culture is assumed.</param>
/// <param name="value">The Object to convert.</param>
/// <param name="destinationType">The type to convert the value parameter to.</param>
/// <returns>An object that represents the converted value.</returns>
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException("destinationType");
}
if (destinationType == typeof(InstanceDescriptor) && (value is PieChartItem))
{
PieChartItem item = (PieChartItem)value;
ArrayList collection = new ArrayList();
collection.Add(item.Weight);
collection.Add(item.Color);
collection.Add(item.Text);
collection.Add(item.ToolTipText);
collection.Add(item.Offset);
return(new InstanceDescriptor(value.GetType().GetConstructor(new Type[] { typeof(double), typeof(Color), typeof(string), typeof(string), typeof(float) }), collection));
}
return(base.ConvertTo(context, culture, value, destinationType));
}
/// <summary>
/// Set the currently focused PieChartItem.
/// </summary>
/// <param name="item">The item that currently has mouse focus.</param>
private void SetFocusedItem(PieChartItem item)
{
if (item != this.FocusedItem)
{
FireItemFocusChanging(this.FocusedItem, item);
this.focusedItem = item;
FireItemFocusChanged();
MarkVisualChange(true);
}
// check to see if the item has a tool tip and if it should be displayed
if (this.FocusedItem != null && this.FocusedItem.ToolTipText != null && this.Style.ShowToolTips)
{
toolTip.SetToolTip(this, this.FocusedItem.ToolTipText);
}
else
{
toolTip.RemoveAll();
}
}
/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="oldItem">The item that is losing focus.</param>
/// <param name="newItem">The item that is gaining focus.</param>
public PieChartItemFocusEventArgs(PieChartItem oldItem, PieChartItem newItem)
{
this.oldItem = oldItem;
this.newItem = newItem;
}
/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="item">The item involved with an event.</param>
public PieChartItemEventArgs(PieChartItem item)
{
this.item = item;
}