/// <summary>
/// Creates a new <see cref="DDFeedback"/> object displaying a
/// <see cref="System.Windows.Media.Visual"/> in its current state.
/// </summary>
/// <param name="visual">The visual object to take a snapshot of</param>
/// <param name="size">The size to use for the displayed feedback</param>
/// <returns>A new <see cref="DDFeedback"/> object displaying a snapshot of a
/// <see cref="System.Windows.Media.Visual"/></returns>
public static DDFeedback CreateFromVisual(Visual visual, Size size)
{
var rv = new DDFeedback();
var rtb = new RenderTargetBitmap((int)size.Width, (int)size.Height, 96, 96, PixelFormats.Pbgra32);
var dv = new DrawingVisual();
using (DrawingContext dc = dv.RenderOpen())
{
var brush = new VisualBrush(visual);
dc.DrawRectangle(brush, null, new Rect(new Point(), size));
}
rtb.Render(dv);
var toolTip = rv._toolTip;
toolTip.Padding = new Thickness(0);
toolTip.Content = new Image {
Source = rtb
};
return(rv);
}
private void UIElementGiveFeedback(object sender, GiveFeedbackEventArgs e)
{
var oldFeedback = _feedbackObject;
//Get any UI feedback from the processor if necessary.
if (CacheFeedback == false || _feedbackObject == null)
{
_feedbackObject = _processor.GetDragDropFeedback(e, _dragDropObject);
}
if (_feedbackObject != null)
{
//If the feedback has changed we want to hide the old one
if (oldFeedback != null && ReferenceEquals(oldFeedback, _feedbackObject) == false)
{
oldFeedback.HideFeedback();
}
var currentLoc = MouseUtil.CurrentMousePoint();
_feedbackObject.ShowFeedback(currentLoc);
//If we want to hide the default cursors, mark this event as handled
if (_feedbackObject.ShowDefaultCursors == false)
{
e.Handled = true;
}
}
}
private void UIElementMouseMove(object sender, MouseEventArgs e)
{
if (_doDragDrop)
{
//If the mouse has previously been pressed, determine if the mouse has moved far enough to start a drag drop operation
var inputElement = sender as IInputElement;
if (inputElement == null)
{
return;
}
var location = e.GetPosition(inputElement);
//Calculate the distance the mouse has moved since it was originally pressed
var yDelta = Math.Abs(location.Y - _mouseDownPoint.Y);
var xDelta = Math.Abs(location.X - _mouseDownPoint.X);
if (xDelta < MinimumHorizontalDragDistance && yDelta < MinimumVerticalDragDistance)
{
return;
}
//The distance dragged is far enough, invoke the processor to see if we should start the drag drop operation
_doDragDrop = false;
_dragDropObject = _processor.GetDragDropObject(sender, e);
var dependancyObject = sender as DependencyObject;
if (_dragDropObject != null && dependancyObject != null)
{
//Raise the appropriate events and start the drag drop operation
var @event = DDStarted;
if (@event != null)
{
@event(this, EventArgs.Empty);
}
DragDrop.DoDragDrop(dependancyObject, _dragDropObject, DragDropEffects); //this call blocks execution
@event = DDEnded;
if (@event != null)
{
@event(this, EventArgs.Empty);
}
_dragDropObject = null;
//Cleanup any UI feedback that was presented
if (_feedbackObject != null)
{
_feedbackObject.HideFeedback();
_feedbackObject = null;
}
}
}
}
/// <summary>
/// Creates a new <see cref="DDFeedback"/> object with the specified text
/// and optional foreground and background colors
/// </summary>
/// <param name="text">The text to display</param>
/// <param name="background">The background color</param>
/// <param name="forground">The foreground color</param>
/// <returns>A new <see cref="DDFeedback"/> object displaying text</returns>
public static DDFeedback CreateFromText(string text, Color?background = null, Color?forground = null)
{
var rv = new DDFeedback();
var toolTip = rv._toolTip;
toolTip.Content = text;
if (background != null)
{
toolTip.Background = new SolidColorBrush(background.Value);
}
if (forground != null)
{
toolTip.Foreground = new SolidColorBrush(forground.Value);
}
return(rv);
}
