/// <summary>
/// Initializes a selection or drag operation.
/// </summary>
/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
protected virtual void StartDrag(MouseEventArgs e)
{
ImageBoxCancelEventArgs args;
args = new ImageBoxCancelEventArgs(e.Location);
this.OnSelecting(args);
this.WasDragCancelled = args.Cancel;
this.IsSelecting = !args.Cancel;
if (this.IsSelecting)
{
this.SelectNone();
_startMousePosition = e.Location;
}
}
/// <summary>
/// Raises the <see cref="ImageBox.Selecting" /> event.
/// </summary>
/// <param name="e">
/// The <see cref="System.EventArgs" /> instance containing the event data.
/// </param>
protected override void OnSelecting(ImageBoxCancelEventArgs e)
{
e.Cancel = this.IsMovingSelection || this.IsResizingSelection || this.SelectionRegion.Contains(this.PointToImage(e.Location)) || this.HitDragHandleTest(e.Location) != DragHandleAnchor.None;
base.OnSelecting(e);
}
/// <summary>
/// Raises the <see cref="Selecting" /> event.
/// </summary>
/// <param name="e">
/// The <see cref="System.EventArgs" /> instance containing the event data.
/// </param>
protected virtual void OnSelecting(ImageBoxCancelEventArgs e)
{
EventHandler<ImageBoxCancelEventArgs> handler;
handler = this.Selecting;
if (handler != null)
{
handler(this, e);
}
}
