public void OnMouseDown(Grid target, IUnityContainer container, MouseEventArgs e)
{
if (target != container.Resolve <Grid>(Key))
{
return;
}
var viewport = container.Resolve <Rectangle>(Key);
var rowSpan = Grid.GetRowSpan(viewport);
var currentRow = Grid.GetRow(viewport);
var row = target.GetRow(e.GetPosition(target));
if (!row.HasValue)
{
return;
}
while (row + rowSpan / 2 > target.RowDefinitions.Count)
{
row--;
}
Grid.SetRow(viewport, Math.Max(row.Value - rowSpan / 2, 0));
var colSpan = Grid.GetColumnSpan(viewport);
var currentCol = Grid.GetColumn(viewport);
var col = target.GetColumn(e.GetPosition(target));
if (!col.HasValue)
{
return;
}
while (col + colSpan / 2 > target.ColumnDefinitions.Count)
{
col--;
}
Grid.SetColumn(viewport, Math.Max(col.Value - colSpan / 2, 0));
if (currentRow != row || currentCol != col)
{
ViewportEventDispatcher.DispatchMoveEvent(viewport, container);
}
}
public void OnMouseWheel(Grid target, IUnityContainer container, MouseWheelEventArgs e)
{
if (target != container.Resolve <Grid>(Key))
{
return;
}
var viewport = container.Resolve <Rectangle>(Key);
var rowSpan = Grid.GetRowSpan(viewport);
var currentRow = Grid.GetRow(viewport);
var row = currentRow - (Math.Sign(e.Delta) * rowSpan / 2);
var last = Math.Max((target.RowDefinitions.Count) - Grid.GetRowSpan(viewport), 0);
row = Math.Max(row, 0);
row = Math.Min(row, last);
Grid.SetRow(viewport, row);
if (currentRow != row)
{
ViewportEventDispatcher.DispatchMoveEvent(viewport, container);
}
}
