private static void StartDrag(DragInfo dragInfo, BrowserEvents browserEvents)
{
var sourceItems = dragInfo.SourceItems.Cast <object>();
// only support single selection
int itemCount = sourceItems.Count();
if (itemCount != 1)
{
return;
}
dragInfo.Data = sourceItems.Single();
// browser node
BrowserNodeViewModel viewModel = dragInfo.Data as BrowserNodeViewModel;
if (viewModel == null)
{
return;
}
// If view model doesn't support dragging, then bail
if (!viewModel.SupportsDrag)
{
dragInfo.Effects = DragDropEffects.None;
return;
}
// collect event arguments
BrowserValidateEventArgs args = new BrowserValidateEventArgs
{
BrowserNodeViewModel = viewModel,
DataObject = dragInfo,
};
// Validate the drag operation.
if (browserEvents != null)
{
browserEvents.RaiseOnBeforeStartDrag(args);
if (!args.StopEvent)
{
// Raise start drag event
browserEvents.RaiseOnStartDrag(args);
}
}
dragInfo.Effects = (dragInfo.Data != null) ? DragDropEffects.Copy : DragDropEffects.None;
}
private static void OnPreviewMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
if (BrowserEventsHandler == null)
{
return;
}
// Handle drag&drop, click and double click
if (s_isDragging)
{
return;
}
// Ignore the click if the user has clicked on a scrollbar.
if (HitTestScrollBar(sender, e))
{
s_dragInfo = null;
return;
}
// If the mouse doesn't click on any item.
// Return if the mouse is not click on the element
var dataContext = HitTestValidItem(sender, e);
if (dataContext == null)
{
return;
}
// Handle double click
if (e.ClickCount == 2)
{
// Make sure the first clicked item is equal to the second clicked item.
BrowserNodeViewModel viewModel = GetSelectedBrowserNodeViewModel(sender);
if (viewModel == null || dataContext != viewModel)
{
return;
}
// collect event arguments
BrowserValidateEventArgs args = new BrowserValidateEventArgs()
{
Sender = sender
};
args.BrowserNodeViewModel = viewModel;
args.DataObject = viewModel.DataObject;
args.StopEvent = false;
// If hook to browser events, raise double click event.
bool hookBrowserEvents = GetHookBrowserEvents((UIElement)sender);
if (hookBrowserEvents && BrowserEventsHandler != null)
{
// Validate the drag operation.
BrowserEventsHandler.RaiseOnBeforeDoubleClick(args);
if (!args.StopEvent)
{
// Raise event
BrowserEventsHandler.RaiseOnDoubleClick(args);
}
}
}
else
{
// Create a drag info which will be used in next events.
s_dragInfo = new DragInfo(sender, e);
}
}
