protected override FileExplorer.Script.IScriptCommand onEvent(RoutedEvent eventId)
{
switch (eventId.Name)
{
case "KeyDown":
return
(ScriptCommands.AssignGlobalParameterDic("{DragDrop}", false,
//If current drag drop mode is Canvas,
ScriptCommands.IfEquals(DragDropLiteCommand.DragDropModeKey, "Canvas",
//And Escape is pressed.
HubScriptCommands.IfKeyGesture("Esc",
//Cancel Canvas drop (by clear {DragDrop} parameters)
DragDropScriptCommands.CancelCanvasDrag(
//Set {EventArgs.Handled} to true.
HubScriptCommands.SetRoutedEventHandled(
//and Detach adorner.
HubScriptCommands.DettachSelectedItemsAdorner("SelectedItemsAdorner}")))))));
case "PreviewTouchDown":
case "PreviewMouseDown":
return
//Find a DataContext that implement SupportDrag.
(HubScriptCommands.AssignDataContext("{EventArgs.OriginalSource}",
DataContextType.SupportDrag, "{ISupportDrag}", null, false,
//And If there's one.
ScriptCommands.IfAssigned("{ISupportDrag}",
//Calculate a number of positions.
HubScriptCommands.ObtainPointerPosition(
//Assign the datacontext item to {ItemUnderMouse}
HubScriptCommands.AssignItemUnderMouse("{ItemUnderMouse}", false,
//And set Sender's StartDraggingItem to {ItemUnderMouse}
ScriptCommands.IfAssigned("{ItemUnderMouse}",
ScriptCommands.IfTrue("{ItemUnderMouse.IsSelected}",
HubScriptCommands.SetDependencyProperty("{Sender}",
UIEventHubProperties.StartDraggingItemProperty, "{ItemUnderMouse}"))))))));
case "TouchDrag":
case "MouseDrag":
return
//If event not marked handled.
(HubScriptCommands.IfNotRoutedEventHandled(
HubScriptCommands.IfDependencyPropertyEqualDefaultValue <object>("{Sender}",
UIEventHubProperties.StartDraggingItemProperty,
//If StartDraggingProperty = null, return.
ResultCommand.NoError,
//If StartDraggingProperty != null, Check and set IsDraggingProperty to true.
HubScriptCommands.SetDependencyPropertyIfDifferentValue("{Sender}",
UIEventHubProperties.IsDraggingProperty, true,
//If changed IsDraggingProperty, Find DataContext that support ISupportDrag to {ISupportDrag} variable.
HubScriptCommands.AssignDataContext("{EventArgs.OriginalSource}", DataContextType.SupportDrag, "{ISupportDrag}", null, false,
//If ISupportDrag is assigned to a non-null value,
//Initialize DragLiteParameters (in {DragDrop} global parameterDic).
DragDropScriptCommands.StartCanvasDrag("{ISupportDrag}",
//then set {EventArgs.Handled} to true.
HubScriptCommands.SetRoutedEventHandled(
//And attach/update adorner.
HubScriptCommands.AttachSelectedItemsAdorner("{SelectedItemsAdorner}",
HubScriptCommands.UpdateSelectedItemsAdorner("{SelectedItemsAdorner}")))))
, null))));
case "MouseMove":
case "TouchMove":
return
//Only 1 of 5 TouchEvent will be processed
(HubScriptCommands.ThrottleTouchDrag(5,
ScriptCommands.AssignGlobalParameterDic("{DragDrop}", false,
ScriptCommands.IfEquals(DragDropLiteCommand.DragDropModeKey, "Canvas",
HubScriptCommands.ObtainPointerPosition(
//Update adorner CentrePosition.
HubScriptCommands.UpdateSelectedItemsAdorner("{SelectedItemsAdorner}"))))));
case "PreviewTouchUp":
case "PreviewMouseUp":
return
(HubScriptCommands.SetDependencyPropertyIfDifferentValue("{Sender}", UIEventHubProperties.IsDraggingProperty, false,
HubScriptCommands.SetDependencyPropertyValue <object>("{Sender}", UIEventHubProperties.StartDraggingItemProperty, null,
//Update position of each IPostionAware and clear {DragDrop} parameters)
DragDropScriptCommands.EndCanvasDrag(
//Set {EventArgs.Handled} to true.
HubScriptCommands.SetRoutedEventHandled(
//Detach adorner.
HubScriptCommands.DettachSelectedItemsAdorner("SelectedItemsAdorner}"))))));
}
return(base.onEvent(eventId));
}
