private void UpdateSnapLine(SnapLinePositions positions, FrameworkElement elem)
{
double?x = null;
double?y = null;
if ((positions & SnapLinePositions.Top) == SnapLinePositions.Top)
{
y = Canvas.GetTop(elem);
}
if ((positions & SnapLinePositions.Bottom) == SnapLinePositions.Bottom)
{
y = Canvas.GetTop(elem) + elem.ActualHeight;
}
if ((positions & SnapLinePositions.Left) == SnapLinePositions.Left)
{
x = Canvas.GetLeft(elem);
}
if ((positions & SnapLinePositions.Right) == SnapLinePositions.Right)
{
x = Canvas.GetLeft(elem) + elem.ActualWidth;
}
if (x.HasValue && y.HasValue)
{
lineX.X1 = lineX.X2 = x.Value;
lineY.Y1 = lineY.Y2 = y.Value;
}
}
private void Window_MouseMove_1(object sender, MouseEventArgs e)
{
if (_isMousePressed)
{
Point p = e.GetPosition(mainCanvas);
// Use the system parameters to determine when to flag dragging
if (!_isMouseDragging && ((Math.Abs(p.X - _originalMousePosition.X) > SystemParameters.MinimumHorizontalDragDistance) || (Math.Abs(p.Y - _originalMousePosition.Y) > SystemParameters.MinimumVerticalDragDistance)))
{
_isMouseDragging = true;
}
if (_isMouseDragging)
{
Point point = new Point((int)(p.X - (_originalMousePosition.X - _originalElementPosition.X)), (int)(p.Y - (_originalMousePosition.Y - _originalElementPosition.Y)));
bool controlDown = (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl));
bool shiftDown = (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift));
SnapLinePositions snapLines = (SnapLinePositions.Top | SnapLinePositions.Left);
if (controlDown && shiftDown)
{
var left = point.X;
var top = point.Y;
var bottom = (top + _selection.ActualHeight);
var right = (left + _selection.ActualWidth);
var moveLeft = left;
var moveTop = top;
foreach (ItemControl item in _items)
{
if (item.IsVisible && item != _selection)
{
var itemLeft = Canvas.GetLeft(item);
var itemTop = Canvas.GetTop(item);
var itemBottom = (itemTop + item.ActualHeight);
var itemRight = (itemLeft + item.ActualWidth);
#region Opposite Sides
// Left/Right
if (Math.Abs(left - itemRight) < 10)
{
snapLines &= ~SnapLinePositions.Right;
snapLines |= SnapLinePositions.Left;
moveLeft = itemRight;
}
// Right/Left
if (Math.Abs(right - itemLeft) < 10)
{
snapLines &= ~SnapLinePositions.Left;
snapLines |= SnapLinePositions.Right;
moveLeft = (itemLeft - _selection.ActualWidth);
}
// Bottom/Top
if (Math.Abs(bottom - itemTop) < 10)
{
snapLines &= ~SnapLinePositions.Top;
snapLines |= SnapLinePositions.Bottom;
moveTop = (itemTop - _selection.ActualHeight);
}
// Top/Bottom
if (Math.Abs(top - itemBottom) < 10)
{
snapLines &= ~SnapLinePositions.Bottom;
snapLines |= SnapLinePositions.Top;
moveTop = itemBottom;
}
#endregion
#region Same Sides
// Right/Right
if (Math.Abs(itemRight - right) < 10)
{
snapLines &= ~SnapLinePositions.Left;
snapLines |= SnapLinePositions.Right;
moveLeft = (itemRight - _selection.ActualWidth);
}
// Left/Left
if (Math.Abs(itemLeft - point.X) < 10)
{
snapLines &= ~SnapLinePositions.Right;
snapLines |= SnapLinePositions.Left;
moveLeft = itemLeft;
}
// Bottom/Bottom
if (Math.Abs(itemBottom - bottom) < 10)
{
snapLines &= ~SnapLinePositions.Top;
snapLines |= SnapLinePositions.Bottom;
moveTop = (itemBottom - _selection.ActualHeight);
}
// Top/Top
if (Math.Abs(itemTop - top) < 10)
{
snapLines &= ~SnapLinePositions.Bottom;
snapLines |= SnapLinePositions.Top;
moveTop = itemTop;
}
#endregion
}
}
point = new Point(moveLeft, moveTop);
}
else
{
if (Settings.Snap.Enabled)
{
point = Helper.SnapPoint(point, _selection.ActualWidth);
}
}
ShowSnapLine();
UpdateSnapLine(snapLines, _selection);
Canvas.SetLeft(_selection, Helper.BoundX(point.X, _selection));
Canvas.SetTop(_selection, Helper.BoundY(point.Y, _selection));
UpdateTitle();
}
}
}
