/// <summary>
/// Handler for resizing from the bottom-right.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="args">The <see cref="System.Windows.Controls.Primitives.DragDeltaEventArgs"/> instance containing the event data.</param>
private void HandleBottomRight(object sender, DragDeltaEventArgs args)
{
CalculateWidth calculateWidthFunc = (oldWidth) => { return(oldWidth + args.HorizontalChange); };
CalculateHeight calculateHeightFunc = (oldHeight) => { return(oldHeight + args.VerticalChange); };
CalculateHorizontalChange calculateHorizontalChangeFunc = (minWidth, oldWidth) => { return(minWidth - oldWidth); };
CalculateVerticalChange calculateVerticalChangeFunc = (minHeight, oldHeight) => { return(minHeight - oldHeight); };
// bottom right corner does not need to adjust the position of the element canvas
SetAdornedElementCanvas setAdornedElementCanvas = (adornedElement, finalHeight, oldHeight, finalWidth, oldWidth) => { };
HandleResizing(sender, args, calculateWidthFunc, calculateHeightFunc,
calculateHorizontalChangeFunc, calculateVerticalChangeFunc, setAdornedElementCanvas);
}
/// <summary>
/// Handles the delta change of the thumb
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="args">The <see cref="System.Windows.Controls.Primitives.DragDeltaEventArgs"/> instance containing the event data.</param>
/// <param name="computeWidthFunc">The function that must compute the new width.</param>
/// <param name="computeHeightFunc">The function that must compute new height.</param>
/// <param name="computeHorizontalChangeFunc">The function that must compute horizontal change adjusted to minimum</param>
/// <param name="computeVerticalChangeFunc">The function that must compute vertical change adjusted to minimum</param>
/// <param name="setAdornedElementCanvasFunc">The set adorned element canvas func.</param>
private void HandleResizing(object sender, DragDeltaEventArgs args,
CalculateWidth computeWidthFunc,
CalculateHeight computeHeightFunc,
CalculateHorizontalChange computeHorizontalChangeFunc,
CalculateVerticalChange computeVerticalChangeFunc,
SetAdornedElementCanvas setAdornedElementCanvasFunc)
{
FrameworkElement adornedElement = this.AdornedElement as FrameworkElement;
Thumb hitThumb = sender as Thumb;
if (adornedElement == null || hitThumb == null)
{
return;
}
double minWidth, oldWidth, computedWidth;
double minHeight, oldHeight, computedHeight;
// Ensure that the Width and Height are properly initialized after the resize.
EnforceSize(adornedElement);
minWidth = adornedElement.MinWidth == 0 ? hitThumb.DesiredSize.Width : adornedElement.MinWidth;
minHeight = adornedElement.MinHeight == 0 ? hitThumb.DesiredSize.Height : adornedElement.MinHeight;
// 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.
oldWidth = adornedElement.Width;
oldHeight = adornedElement.Height;
//compute width based on delta args
computedWidth = computeWidthFunc(oldWidth);
computedHeight = computeHeightFunc(oldHeight);
double finalWidth = Math.Max(computedWidth, minWidth);
double finalHeight = Math.Max(computedHeight, minHeight);
adornedElement.Width = finalWidth;
adornedElement.Height = finalHeight;
setAdornedElementCanvasFunc(adornedElement, finalHeight, oldHeight, finalWidth, oldWidth);
double oldCanvasTop = Canvas.GetTop(adornedElement);
Canvas.SetTop(adornedElement, oldCanvasTop - (finalHeight - oldHeight));
NotifyResizing(minWidth, oldWidth, computedWidth, finalWidth,
minHeight, oldHeight, computedHeight, finalHeight,
args, computeHorizontalChangeFunc, computeVerticalChangeFunc);
}
/// <summary>
/// Handler for resizing from the bottom-left.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="args">The <see cref="System.Windows.Controls.Primitives.DragDeltaEventArgs"/> instance containing the event data.</param>
private void HandleBottomLeft(object sender, DragDeltaEventArgs args)
{
CalculateWidth calculateWidthFunc = (oldWidth) => { return(oldWidth - args.HorizontalChange); };
CalculateHeight calculateHeightFunc = (oldHeight) => { return(oldHeight + args.VerticalChange); };
CalculateHorizontalChange calculateHorizontalChangeFunc = (minWidth, oldWidth) => { return(oldWidth - minWidth); };
CalculateVerticalChange calculateVerticalChangeFunc = (minHeight, oldHeight) => { return(minHeight - oldHeight); };
//bottom left corner needs to adjust position of left property of the element canvas
SetAdornedElementCanvas setAdornedElementCanvas =
(adornedElement, finalHeight, oldHeight, finalWidth, oldWidth) =>
{
double oldCanvasLeft = Canvas.GetLeft(adornedElement);
Canvas.SetLeft(adornedElement, oldCanvasLeft - (finalWidth - oldWidth));
};
HandleResizing(sender, args, calculateWidthFunc, calculateHeightFunc,
calculateHorizontalChangeFunc, calculateVerticalChangeFunc, setAdornedElementCanvas);
}
/// <summary>
/// Handles the delta change of the thumb
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="args">The <see cref="System.Windows.Controls.Primitives.DragDeltaEventArgs"/> instance containing the event data.</param>
/// <param name="computeWidthFunc">The function that must compute the new width.</param>
/// <param name="computeHeightFunc">The function that must compute new height.</param>
/// <param name="computeHorizontalChangeFunc">The function that must compute horizontal change adjusted to minimum</param>
/// <param name="computeVerticalChangeFunc">The function that must compute vertical change adjusted to minimum</param>
/// <param name="setAdornedElementCanvasFunc">The set adorned element canvas func.</param>
private void HandleResizing(object sender, DragDeltaEventArgs args,
CalculateWidth computeWidthFunc,
CalculateHeight computeHeightFunc,
CalculateHorizontalChange computeHorizontalChangeFunc,
CalculateVerticalChange computeVerticalChangeFunc,
SetAdornedElementCanvas setAdornedElementCanvasFunc)
{
FrameworkElement adornedElement = this.AdornedElement as FrameworkElement;
Thumb hitThumb = sender as Thumb;
if (adornedElement == null || hitThumb == null) return;
double minWidth, oldWidth, computedWidth;
double minHeight, oldHeight, computedHeight;
// Ensure that the Width and Height are properly initialized after the resize.
EnforceSize(adornedElement);
minWidth = adornedElement.MinWidth == 0 ? hitThumb.DesiredSize.Width : adornedElement.MinWidth;
minHeight = adornedElement.MinHeight == 0 ? hitThumb.DesiredSize.Height : adornedElement.MinHeight;
// 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.
oldWidth = adornedElement.Width;
oldHeight = adornedElement.Height;
//compute width based on delta args
computedWidth = computeWidthFunc(oldWidth);
computedHeight = computeHeightFunc(oldHeight);
double finalWidth = Math.Max(computedWidth, minWidth);
double finalHeight = Math.Max(computedHeight, minHeight);
adornedElement.Width = finalWidth;
adornedElement.Height = finalHeight;
setAdornedElementCanvasFunc(adornedElement, finalHeight, oldHeight, finalWidth, oldWidth);
double oldCanvasTop = Canvas.GetTop(adornedElement);
Canvas.SetTop(adornedElement, oldCanvasTop - (finalHeight - oldHeight));
NotifyResizing(minWidth, oldWidth, computedWidth, finalWidth,
minHeight, oldHeight, computedHeight, finalHeight,
args, computeHorizontalChangeFunc, computeVerticalChangeFunc);
}