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using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using DiagramDesigner.Controls;
namespace DiagramDesigner
{
//These attributes identify the types of the named parts that are used for templating
[TemplatePart(Name = "PART_DragThumb", Type = typeof(DragThumb))]
[TemplatePart(Name = "PART_ResizeDecorator", Type = typeof(Control))]
[TemplatePart(Name = "PART_ConnectorDecorator", Type = typeof(Control))]
[TemplatePart(Name = "PART_ContentPresenter", Type = typeof(ContentPresenter))]
public class DesignerItem : ContentControl, ISelectable
{
#region IsSelected Property
public bool IsSelected
{
get { return (bool)GetValue(IsSelectedProperty); }
set { SetValue(IsSelectedProperty, value); }
}
public static readonly DependencyProperty IsSelectedProperty =
DependencyProperty.Register("IsSelected",
typeof(bool),
typeof(DesignerItem),
new FrameworkPropertyMetadata(false));
#endregion
#region DragThumbTemplate Property
// can be used to replace the default template for the DragThumb
public static readonly DependencyProperty DragThumbTemplateProperty =
DependencyProperty.RegisterAttached("DragThumbTemplate", typeof(ControlTemplate), typeof(DesignerItem));
public static ControlTemplate GetDragThumbTemplate(UIElement element)
{
return (ControlTemplate)element.GetValue(DragThumbTemplateProperty);
}
public static void SetDragThumbTemplate(UIElement element, ControlTemplate value)
{
element.SetValue(DragThumbTemplateProperty, value);
}
#endregion
#region ConnectorDecoratorTemplate Property
// can be used to replace the default template for the ConnectorDecorator
public static readonly DependencyProperty ConnectorDecoratorTemplateProperty =
DependencyProperty.RegisterAttached("ConnectorDecoratorTemplate", typeof(ControlTemplate), typeof(DesignerItem));
public static ControlTemplate GetConnectorDecoratorTemplate(UIElement element)
{
return (ControlTemplate)element.GetValue(ConnectorDecoratorTemplateProperty);
}
public static void SetConnectorDecoratorTemplate(UIElement element, ControlTemplate value)
{
element.SetValue(ConnectorDecoratorTemplateProperty, value);
}
#endregion
#region IsDragConnectionOver
// while drag connection procedure is ongoing and the mouse moves over
// this item this value is true; if true the ConnectorDecorator is triggered
// to be visible, see template
public bool IsDragConnectionOver
{
get { return (bool)GetValue(IsDragConnectionOverProperty); }
set { SetValue(IsDragConnectionOverProperty, value); }
}
public static readonly DependencyProperty IsDragConnectionOverProperty =
DependencyProperty.Register("IsDragConnectionOver",
typeof(bool),
typeof(DesignerItem),
new FrameworkPropertyMetadata(false));
#endregion
static DesignerItem()
{
// set the key to reference the style for this control
FrameworkElement.DefaultStyleKeyProperty.OverrideMetadata(
typeof(DesignerItem), new FrameworkPropertyMetadata(typeof(DesignerItem)));
}
public DesignerItem()
{
this.Loaded += new RoutedEventHandler(DesignerItem_Loaded);
}
protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseDown(e);
DesignerCanvas designer = VisualTreeHelper.GetParent(this) as DesignerCanvas;
// update selection
if (designer != null)
if ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) != ModifierKeys.None)
if (this.IsSelected)
{
this.IsSelected = false;
designer.SelectedItems.Remove(this);
}
else
{
this.IsSelected = true;
designer.SelectedItems.Add(this);
}
else if (!this.IsSelected)
{
foreach (ISelectable item in designer.SelectedItems)
item.IsSelected = false;
designer.SelectedItems.Clear();
this.IsSelected = true;
designer.SelectedItems.Add(this);
}
e.Handled = false;
}
void DesignerItem_Loaded(object sender, RoutedEventArgs e)
{
// if DragThumbTemplate and ConnectorDecoratorTemplate properties of this class
// are set these templates are applied;
// Note: this method is only executed when the Loaded event is fired, so
// setting DragThumbTemplate or ConnectorDecoratorTemplate properties after
// will have no effect.
if (base.Template != null)
{
ContentPresenter contentPresenter =
this.Template.FindName("PART_ContentPresenter", this) as ContentPresenter;
if (contentPresenter != null)
{
UIElement contentVisual = VisualTreeHelper.GetChild(contentPresenter, 0) as UIElement;
if (contentVisual != null)
{
DragThumb thumb = this.Template.FindName("PART_DragThumb", this) as DragThumb;
Control connectorDecorator = this.Template.FindName("PART_ConnectorDecorator", this) as Control;
if (thumb != null)
{
ControlTemplate template =
DesignerItem.GetDragThumbTemplate(contentVisual) as ControlTemplate;
if (template != null)
thumb.Template = template;
}
if (connectorDecorator != null)
{
ControlTemplate template =
DesignerItem.GetConnectorDecoratorTemplate(contentVisual) as ControlTemplate;
if (template != null)
connectorDecorator.Template = template;
}
}
}
}
}
}
}
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