private void UpdateBinding()
{
// the CurrentIndex is coerced, so is always valid.
var source = Items.OfType<object>().ElementAtOrDefault(CurrentIndex);
// update CurrentItem, only used for data binding
CurrentItem = source;
if (ElementTitleTextBlock != null)
{
var b = new Binding(TitlePath) { Source = source };
ElementTitleTextBlock.SetBinding(TextBlock.TextProperty, b);
}
if (ElementMessageTextBlock != null)
{
var b = new Binding(MessagePath) { Source = source };
ElementMessageTextBlock.SetBinding(TextBlock.TextProperty, b);
}
if (ElementDetailTextBlock != null)
{
var b = new Binding(DetailPath) { Source = source };
ElementDetailTextBlock.SetBinding(TextBlock.TextProperty, b);
// check if current item has detail value
var e = new BindingEvaluator<string>(b);
string d = e.GetBindingValue(source);
_hasDetail = !string.IsNullOrWhiteSpace(d);
}
else
{
_hasDetail = false;
}
if (_isMouseOver)
{
if (_hasDetail)
ShowDetail();
else
HideDetail();
}
}
private string GetDisplayText(object dataItem)
{
if (BindingEvaluator == null)
{
BindingEvaluator = new BindingEvaluator(new Binding(DisplayMember));
}
if (dataItem == null)
{
return string.Empty;
}
if (string.IsNullOrEmpty(DisplayMember))
{
return dataItem.ToString();
}
return BindingEvaluator.Evaluate(dataItem);
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
Editor = Template.FindName(PartEditor, this) as TextBox;
Popup = Template.FindName(PartPopup, this) as Popup;
ItemsSelector = Template.FindName(PartSelector, this) as Selector;
BindingEvaluator = new BindingEvaluator(new Binding(DisplayMember));
if (Editor != null)
{
Editor.TextChanged += OnEditorTextChanged;
Editor.PreviewKeyDown += OnEditorKeyDown;
Editor.LostFocus += OnEditorLostFocus;
if (SelectedItem != null)
{
Editor.Text = BindingEvaluator.Evaluate(SelectedItem);
}
}
if (Popup != null)
{
Popup.StaysOpen = false;
Popup.Opened += OnPopupOpened;
Popup.Closed += OnPopupClosed;
}
if (ItemsSelector != null)
{
SelectionAdapter = new SelectionAdapter(ItemsSelector);
SelectionAdapter.Commit += OnSelectionAdapterCommit;
SelectionAdapter.Cancel += OnSelectionAdapterCancel;
SelectionAdapter.SelectionChanged += OnSelectionAdapterSelectionChanged;
}
}
/// <summary>
/// Received the notifications when the wrapped event has been raised.
/// </summary>
/// <param name="sender">source of the event</param>
/// <param name="e">arguments of the event</param>
private void OnEventRaised(object sender, object e)
{
BindingEvaluator commandBinding = new BindingEvaluator((FrameworkElement)sender, this.Binding.Binding);
ICommand command = commandBinding.Value as ICommand;
object commandParameter;
if (this.Binding.ParameterBinding is Binding)
{
BindingEvaluator commandParameterBinding = new BindingEvaluator((FrameworkElement)sender, (Binding)this.Binding.ParameterBinding);
commandParameter = commandParameterBinding.Value;
}
else
{
commandParameter = this.Binding.Parameter;
}
if(commandParameter == null && this.Binding.PassEventArgsToCommand)
{
//TODO: GIANNI - TO BE IMPROVED!!!!
if (this.Binding.EventName == "ItemClick")
{
commandParameter = ((Windows.UI.Xaml.Controls.ItemClickEventArgs)e).ClickedItem;
}
else
{
commandParameter = e;
}
}
if (command != null)
command.Execute(commandParameter);
}
void UpdateGrid()
{
if (_root == null || ItemsSource == null)
{
return;
}
_root.Children.Clear();
_root.ColumnDefinitions.Clear();
_independentValues.Clear();
_dependentValues.Clear();
BindingEvaluator independentBinding = new BindingEvaluator(IndependentValuePath);
BindingEvaluator dependentBinding = new BindingEvaluator(DependentValuePath);
int column = 0;
foreach (var item in ItemsSource)
{
var independentValue = independentBinding.Eval(item).ToString();
var dependentValue = (long)dependentBinding.Eval(item);
_dependentValues.Add(dependentValue);
_root.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) });
TextBlock independentTB = new TextBlock();
independentTB.Text = independentValue;
independentTB.FontSize = IndependentValueFontSize;
independentTB.Foreground = IndependentValueBrush;
independentTB.VerticalAlignment = VerticalAlignment.Center;
independentTB.HorizontalAlignment = HorizontalAlignment.Center;
independentTB.SetValue(Grid.RowProperty, 3);
independentTB.SetValue(Grid.ColumnProperty, column++);
_root.Children.Add(independentTB);
}
Rectangle rc = new Rectangle();
rc.Fill = GridLineBrush;
rc.Height = 1;
rc.SetValue(Grid.RowProperty, 1);
rc.SetValue(Grid.ColumnSpanProperty, column);
_root.Children.Add(rc);
var min = _dependentValues.Min();
var max = _dependentValues.Max();
long temp = 0;
if (min >= 0 && max >= 0)
{
temp = max;
}
else if (min < 0 && max >= 0)
{
temp = max - min;
}
else if (max < 0)
{
temp = -min;
}
var height = (this.ActualHeight - 1 - 30) / temp;
for (int i = 0; i < _dependentValues.Count; i++)
{
var dependentValue = _dependentValues[i];
TextBlock dependentTB = new TextBlock();
dependentTB.Text = dependentValue.ToString();
dependentTB.FontSize = DependentValueFontSize;
dependentTB.Foreground = dependentValue >= 0 ? PositiveValueBrush : NegativeValueBrush;
dependentTB.VerticalAlignment = dependentValue > 0 ? VerticalAlignment.Top : VerticalAlignment.Bottom;
dependentTB.HorizontalAlignment = HorizontalAlignment.Center;
dependentTB.SetValue(Grid.RowProperty, dependentValue > 0 ? 2 : 0);
dependentTB.SetValue(Grid.ColumnProperty, i);
Rectangle dependentRC = new Rectangle();
dependentRC.Fill = dependentValue >= 0 ? PositiveValueBrush : NegativeValueBrush;
dependentRC.Height = Math.Abs(height * dependentValue);
dependentRC.Margin = new Thickness(20, 0, 20, 0);
dependentRC.VerticalAlignment = dependentValue <= 0 ? VerticalAlignment.Top : VerticalAlignment.Bottom;
dependentRC.SetValue(Grid.RowProperty, dependentValue <= 0 ? 2 : 0);
dependentRC.SetValue(Grid.ColumnProperty, i);
_root.Children.Add(dependentRC);
_root.Children.Add(dependentTB);
}
}
public SearchableComboBox()
{
_valuePathEvaluator = new BindingEvaluator(SearchValuePath);
}
