protected void OnCalculateSize(ResizeArgs args)
{
var evnt = ResizeEvent;
if (evnt != null)
{
evnt(args);
}
}
// Handler for resizing from the top-left.
void HandleTopLeft(object sender, DragDeltaEventArgs args)
{
FrameworkElement adornedElement = AdornedElement as FrameworkElement;
Thumb hitThumb = sender as Thumb;
if (adornedElement == null || hitThumb == null)
{
return;
}
// Ensure that the Width and Height are properly initialized after the resize.
EnforceSize(adornedElement);
double width_old = adornedElement.Width;
double width_new = Math.Max(adornedElement.Width - args.HorizontalChange, hitThumb.DesiredSize.Width);
double left_old = Canvas.GetLeft(adornedElement);
double height_old = adornedElement.Height;
double height_new = Math.Max(adornedElement.Height - args.VerticalChange, hitThumb.DesiredSize.Height);
double top_old = Canvas.GetTop(adornedElement);
var resizeArgs = new ResizeArgs
{
ResizeType = ResizeTypes.TopLeft,
Element = adornedElement,
Position = new Point(
(double)left_old - (width_new - width_old),
(double)top_old - (height_new - height_old)
),
Size = new Size(
(double)width_new,
(double)height_new
)
};
// Cheap static hook into resize
OnCalculateSize(resizeArgs);
if (resizeArgs.Cancel)
{
return;
}
adornedElement.Width = resizeArgs.Size.Width;
Canvas.SetLeft(adornedElement, resizeArgs.Position.X);
adornedElement.Height = resizeArgs.Size.Height;
Canvas.SetTop(adornedElement, resizeArgs.Position.Y);
}
// Handler for resizing from the bottom-right.
void HandleBottomRight(object sender, DragDeltaEventArgs args)
{
FrameworkElement adornedElement = this.AdornedElement as FrameworkElement;
Thumb hitThumb = sender as Thumb;
if (adornedElement == null || hitThumb == null)
{
return;
}
FrameworkElement parentElement = adornedElement.Parent as FrameworkElement;
// Ensure that the Width and Height are properly initialized after the resize.
EnforceSize(adornedElement);
var resizeArgs = new ResizeArgs
{
ResizeType = ResizeTypes.BottomRight,
Element = adornedElement,
Position = new Point(
Canvas.GetLeft(adornedElement),
Canvas.GetTop(adornedElement)),
Size = new Size(
(double)Math.Max(adornedElement.Width + args.HorizontalChange, hitThumb.DesiredSize.Width),
(double)Math.Max(args.VerticalChange + adornedElement.Height, hitThumb.DesiredSize.Height))
};
// Cheap static hook into resize
OnCalculateSize(resizeArgs);
if (resizeArgs.Cancel)
{
return;
}
// Change the size by the amount the user drags the mouse, as long as it's larger
// than the width or height of an adorner, respectively.
adornedElement.Width = resizeArgs.Size.Width;
adornedElement.Height = resizeArgs.Size.Height;
}
private void ResizingAdorner_ResizeEvent(ResizeArgs e)
{
Point referencePoint = Mouse.GetPosition(null);
Point point = Settings.Snap.Enabled ? Helper.SnapPoint(referencePoint) : referencePoint;
var xDiff = referencePoint.X - point.X;
var yDiff = referencePoint.Y - point.Y;
var item = e.Element as ItemControl;
switch (e.ResizeType)
{
case ResizeTypes.TopLeft:
{
#region Calc
double newX = e.Position.X - xDiff;
double newY = e.Position.Y - yDiff;
double newWidth = Math.Max(0, e.Size.Width + xDiff);
double newHeight = Math.Max(0, e.Size.Height + yDiff);
if (newWidth < item.MinWidth)
{
newX -= (item.MinWidth - newWidth);
newWidth = item.MinWidth;
}
if (newHeight < item.MinHeight)
{
newY -= (item.MinHeight - newHeight);
newHeight = item.MinHeight;
}
e.Position = new Point(newX, newY);
e.Size = new Size(newWidth, newHeight);
UpdateSnapLine((SnapLinePositions.Top | SnapLinePositions.Left), e.Element);
#endregion
}
break;
case ResizeTypes.TopRight:
{
#region Calc
double newY = e.Position.Y - yDiff;
double newWidth = Math.Max(0, e.Size.Width + xDiff);
double newHeight = Math.Max(0, e.Size.Height + yDiff);
if (newWidth < item.MinWidth)
{
newWidth = item.MinWidth;
}
if (newHeight < item.MinHeight)
{
newY -= (item.MinHeight - newHeight);
newHeight = item.MinHeight;
}
e.Position = new Point(e.Position.X, newY);
e.Size = new Size(newWidth, newHeight);
UpdateSnapLine((SnapLinePositions.Top | SnapLinePositions.Right), e.Element);
#endregion
}
break;
case ResizeTypes.BottomLeft:
{
#region Calc
double newX = e.Position.X - xDiff;
double newWidth = Math.Max(0, e.Size.Width + xDiff);
double newHeight = Math.Max(0, e.Size.Height - yDiff);
if (newWidth < item.MinWidth)
{
newX -= (item.MinWidth - newWidth);
newWidth = item.MinWidth;
}
if (newHeight < item.MinHeight)
{
newHeight = item.MinHeight;
}
e.Position = new Point(newX, e.Position.Y);
e.Size = new Size(newWidth, newHeight);
UpdateSnapLine((SnapLinePositions.Bottom | SnapLinePositions.Left), e.Element);
#endregion
}
break;
case ResizeTypes.BottomRight:
{
#region Calc
double newWidth = Math.Max(0, e.Size.Width - xDiff);
double newHeight = Math.Max(0, e.Size.Height - yDiff);
if (newWidth < item.MinWidth)
{
newWidth = item.MinWidth;
}
if (newHeight < item.MinHeight)
{
newHeight = item.MinHeight;
}
e.Size = new Size(newWidth, newHeight);
UpdateSnapLine((SnapLinePositions.Bottom | SnapLinePositions.Right), e.Element);
#endregion
}
break;
}
ShowSnapLine();
UpdateTitle();
}