private void AvailableControls_MouseMove(object sender, MouseEventArgs e)
{
Point mousePos = e.GetPosition(null);
Vector motion = controlDragStartPoint - mousePos;
if (e.LeftButton == MouseButtonState.Pressed &&
(Math.Abs(motion.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(motion.Y) > SystemParameters.MinimumVerticalDragDistance))
{
Border source = ((DependencyObject)e.OriginalSource).FindAncestor <Border>();
if (source == null)
{
return;
}
StackPanel p = source.Child as StackPanel;
//the first child is the label, the second is a separator, and the third is the tilegrid
TileGrid tileGrid = p.Children.Cast <UIElement>().Last() as TileGrid;
//the tilegrid's only child is the control!
SourcedControl c = tileGrid.Children.Cast <UIElement>().Last() as SourcedControl;
//get the source control type info to pass to the dragdrop
Type controlType = c.GetType();
DataObject dragInfo = new DataObject(NetworkDataFormats.SourcedControl, controlType);
DragDrop.DoDragDrop(source, dragInfo, DragDropEffects.Copy | DragDropEffects.Move);
tray.Show();
}
}
private void DashboardRoot_Drop(object sender, DragEventArgs e)
{
if (e.KeyStates.HasFlag(DragDropKeyStates.ControlKey) &&
e.Data.GetDataPresent(NetworkDataFormats.NetworkElement))
{
//offer to create the bound control here
NetworkElement dataSource = (NetworkElement)e.Data.GetData(NetworkDataFormats.NetworkElement);
//all available types
IEnumerable <Type> controlTypes = PluginLoader.GetControls();
IEnumerable <Type> allowedControls;
//check whether this is a primitive or complex data and filter the controls appropriately
if (dataSource.Type == typeof(NetworkTree))
{
//get the expected type of the element
NetworkTable table = NetworkTable.GetTable(dataSource.FullPath);
string dataType = table.GetString("type", null);
allowedControls = controlTypes
.Where((t) => SourcedControl.GetAllowedComplexTypes(t).Contains(dataType));
}
else
{
allowedControls = controlTypes
.Where((t) => SourcedControl.GetAllowedPrimitiveTypes(t).Contains(dataSource.Type));
}
if (allowedControls.Count() != 0)
{
ControlPreviewDialog previewDialog = new ControlPreviewDialog();
PopulateControlPreviewWrapPanel(previewDialog.availableControls, allowedControls);
if (previewDialog.ShowDialog() == true)
{
Type controlType = previewDialog.SelectedType;
if (controlType != null)
{
SourcedControl c = (SourcedControl)controlType.GetConstructor(Type.EmptyTypes).Invoke(null);
PlaceAtDropPoint(c, e);
dashboardRoot.Children.Add(c);
c.Source = dataSource.FullPath.Replace("/SmartDashboard/", "");
}
}
}
else
{
MessageBox.Show("There are no controls that can display this entry!", "Error", MessageBoxButton.OK, MessageBoxImage.Exclamation);
}
}
else if (e.Data.GetDataPresent(NetworkDataFormats.SourcedControl))
{
//create the control here
Type controlType = (Type)e.Data.GetData(NetworkDataFormats.SourcedControl);
SourcedControl c = (SourcedControl)controlType.GetConstructor(Type.EmptyTypes).Invoke(null);
PlaceAtDropPoint(c, e);
dashboardRoot.Children.Add(c);
}
e.Handled = true;
}
private void PopulateControlPreviewWrapPanel(WrapPanel wp, IEnumerable <Type> controlTypes)
{
wp.Children.Clear();
foreach (Type controlType in controlTypes)
{
//do some fancy arranging. what we need:
//size-to-fit border (plus some extra space) with transparent background to register the hits.
//label the extra space with the name of the control
SourcedControl c = (SourcedControl)controlType.GetConstructor(Type.EmptyTypes).Invoke(null);
c.IsEnabled = false;
double expectedWidth = TileGrid.GetColumnSpan(c) * 50;
double expectedHeight = TileGrid.GetRowSpan(c) * 50;
TileGrid container = new TileGrid()
{
ShowGridlines = false,
IsEditable = false,
TileSizingMode = TileSizingMode.Uniform,
Width = expectedWidth,
Height = expectedHeight,
Background = new SolidColorBrush(Colors.Transparent)
};
container.Children.Add(c);
Border outline = new Border()
{
Background = new SolidColorBrush(Colors.Transparent),
BorderBrush = new SolidColorBrush(Colors.Black),
BorderThickness = new Thickness(1),
Margin = new Thickness(5)
};
StackPanel p = new StackPanel();
outline.Child = p;
TextBlock label = new TextBlock()
{
Text = Util.ToTitleCase(controlType.Name),
Margin = new Thickness(2)
};
p.Children.Add(label);
p.Children.Add(new Separator());
p.Children.Add(container);
wp.Children.Add(outline);
}
}
private void PlaceAtDropPoint(SourcedControl c, DragEventArgs e)
{
Point dropPoint = e.GetPosition(dashboardRoot);
//centering. goal: if there span is even, we want to center on nearest line,
//if span is odd, center the nearest full tile
//for even, rounding works because the division causes the control to tend towards the left
int colSpan = TileGrid.GetColumnSpan(c);
int rowSpan = TileGrid.GetRowSpan(c);
double preciseCol = dropPoint.X / dashboardRoot.GetColumnWidth();
double preciseRow = dropPoint.Y / dashboardRoot.GetRowHeight();
int col = colSpan % 2 == 0 ? (int)Math.Round(preciseCol) : (int)Math.Floor(preciseCol);
int row = rowSpan % 2 == 0 ? (int)Math.Round(preciseRow) : (int)Math.Floor(preciseRow);
int colOffset = colSpan / 2;
int rowOffset = rowSpan / 2;
col = Math.Max(col - colOffset, 0);
row = Math.Max(row - rowOffset, 0);
TileGrid.SetColumn(c, col);
TileGrid.SetRow(c, row);
}
