protected override void OnDrop(DragEventArgs e)
{
base.OnDrop(e);
if (e.Data.GetDataPresent(DataFormats.StringFormat))
{
string dataString = (string) e.Data.GetData(DataFormats.StringFormat);
BrushConverter converter = new BrushConverter();
if (converter.IsValid(dataString))
{
Brush newFill = (Brush) converter.ConvertFromString(dataString);
circleUI.Fill = newFill;
if (e.KeyStates.HasFlag(DragDropKeyStates.ControlKey))
{
e.Effects = DragDropEffects.Copy;
}
else
{
e.Effects = DragDropEffects.Move;
}
}
}
e.Handled = true;
}
public static Brush ConvertBrush(System.Drawing.Color color)
{
var b = new BrushConverter();
if (b.IsValid(color.Name)) {
return b.ConvertFromString(color.Name) as SolidColorBrush;
}
return b.ConvertFromString("Black") as SolidColorBrush;
}
private void ellipse_DragOver(object sender, DragEventArgs e)
{
e.Effects = DragDropEffects.None;
// If the DataObject contains string data, extract it.
if (e.Data.GetDataPresent(DataFormats.StringFormat))
{
string dataString = (string)e.Data.GetData(DataFormats.StringFormat);
// If the string can be converted into a Brush, allow copying.
BrushConverter converter = new BrushConverter();
if (converter.IsValid(dataString))
{
e.Effects = DragDropEffects.Copy | DragDropEffects.Move;
}
}
}
private void ellipse_DragEnter(object sender, DragEventArgs e)
{
Ellipse ellipse = sender as Ellipse;
if (ellipse != null)
{
// Save the current Fill brush so that you can revert back to this value in DragLeave.
_previousFill = ellipse.Fill;
// If the DataObject contains string data, extract it.
if (e.Data.GetDataPresent(DataFormats.StringFormat))
{
string dataString = (string)e.Data.GetData(DataFormats.StringFormat);
// If the string can be converted into a Brush, convert it.
BrushConverter converter = new BrushConverter();
if (converter.IsValid(dataString))
{
Brush newFill = (Brush)converter.ConvertFromString(dataString);
ellipse.Fill = newFill;
}
}
}
}
protected override void OnDragOver(DragEventArgs e)
{
base.OnDragOver(e);
e.Effects = DragDropEffects.None;
if (e.Data.GetDataPresent(DataFormats.StringFormat))
{
string dataString = (string) e.Data.GetData(DataFormats.StringFormat);
BrushConverter converter = new BrushConverter();
if (converter.IsValid(dataString))
{
if (e.KeyStates.HasFlag(DragDropKeyStates.ControlKey))
{
e.Effects = DragDropEffects.Copy;
}
else
{
e.Effects = DragDropEffects.Move;
}
}
}
e.Handled = true;
}
protected override void OnDragEnter(DragEventArgs e)
{
base.OnDragEnter(e);
_previousFill = circleUI.Fill;
if (e.Data.GetDataPresent(DataFormats.StringFormat))
{
string dataString = (string) e.Data.GetData(DataFormats.StringFormat);
BrushConverter converter = new BrushConverter();
if (converter.IsValid(dataString))
{
Brush newFill = (Brush) converter.ConvertFromString(dataString);
circleUI.Fill = newFill;
}
}
}
private void ellipse_Drop(object sender, DragEventArgs e)
{
Ellipse ellipse = sender as Ellipse;
if (ellipse != null)
{
// If the DataObject contains string data, extract it.
if (e.Data.GetDataPresent(DataFormats.StringFormat))
{
string dataString = (string)e.Data.GetData(DataFormats.StringFormat);
// If the string can be converted into a Brush,
// convert it and apply it to the ellipse.
BrushConverter converter = new BrushConverter();
if (converter.IsValid(dataString))
{
Brush newFill = (Brush)converter.ConvertFromString(dataString);
ellipse.Fill = newFill;
}
}
}
}