/// <summary>
/// Recalculate both of the scrollbars' locations and lengths.
/// Also reposition the corner rectangle.
/// </summary>
public void resize()
{
// Look up the host metrics once, and use for both scrollbars.
var hostMetrics = this.workspace_.getMetrics();
if (hostMetrics == null)
{
// Host element is likely not visible.
return;
}
// Only change the scrollbars if there has been a change in metrics.
var resizeH = false;
var resizeV = false;
if (this.oldHostMetrics_ == null ||
this.oldHostMetrics_.viewWidth != hostMetrics.viewWidth ||
this.oldHostMetrics_.viewHeight != hostMetrics.viewHeight ||
this.oldHostMetrics_.absoluteTop != hostMetrics.absoluteTop ||
this.oldHostMetrics_.absoluteLeft != hostMetrics.absoluteLeft)
{
// The window has been resized or repositioned.
resizeH = true;
resizeV = true;
}
else
{
// Has the content been resized or moved?
if (this.oldHostMetrics_ == null ||
this.oldHostMetrics_.contentWidth != hostMetrics.contentWidth ||
this.oldHostMetrics_.viewLeft != hostMetrics.viewLeft ||
this.oldHostMetrics_.contentLeft != hostMetrics.contentLeft)
{
resizeH = true;
}
if (this.oldHostMetrics_ == null ||
this.oldHostMetrics_.contentHeight != hostMetrics.contentHeight ||
this.oldHostMetrics_.viewTop != hostMetrics.viewTop ||
this.oldHostMetrics_.contentTop != hostMetrics.contentTop)
{
resizeV = true;
}
}
if (resizeH)
{
this.hScroll.resize(hostMetrics);
}
if (resizeV)
{
this.vScroll.resize(hostMetrics);
}
// Reposition the corner square.
if (this.oldHostMetrics_ == null ||
this.oldHostMetrics_.viewWidth != hostMetrics.viewWidth ||
this.oldHostMetrics_.absoluteLeft != hostMetrics.absoluteLeft)
{
this.corner_.SetAttribute("x", this.vScroll.position_.x.ToString());
}
if (this.oldHostMetrics_ == null ||
this.oldHostMetrics_.viewHeight != hostMetrics.viewHeight ||
this.oldHostMetrics_.absoluteTop != hostMetrics.absoluteTop)
{
this.corner_.SetAttribute("y", this.hScroll.position_.y.ToString());
}
// Cache the current metrics to potentially short-cut the next resize event.
this.oldHostMetrics_ = hostMetrics;
}
/// <summary>
/// Recalculate a vertical scrollbar's location and length.
/// </summary>
/// <param name="hostMetrics">A data structure describing all the
/// required dimensions, possibly fetched from the host object.</param>
private void resizeVertical_(Metrics hostMetrics)
{
// TODO: Inspect metrics to determine if we can get away with just a content
// resize.
this.resizeViewVertical(hostMetrics);
}
