RadCanvasViewport

Gets the size of the rectangle that bounds all non-collapsed children of this viewport; recomputed lazily whenever the children collection changes. The setter is a no-op in release builds.

Applies physical scrolling by offsetting the rendered content so that newValue becomes the top-left visible point of the canvas.

public virtual void DoScroll(Point oldValue, Point newValue)

Implements: IRadScrollViewport.DoScroll(Point, Point)

Returns the current CanvasSize as the extent that determines the scrollbars' range.

public Size GetExtentSize()

Implements: IRadScrollViewport.GetExtentSize()

Builds the horizontal and vertical scrollbar range/step parameters from the given viewport and canvas sizes; both minimums are 0 and the small change is always 1 pixel.

public ScrollPanelParameters GetScrollParams(Size viewportSize, Size canvasSize)

Implements: IRadScrollViewport.GetScrollParams(Size, Size)

Initializes member fields to their default values. This method is called prior the CreateChildItems one and allows for initialization of members on which child elements depend.

protected override void InitializeFields()

Overrides: RadElement.InitializeFields()

Marks the cached CanvasSize as stale so it is recalculated the next time it is requested.

public void InvalidateViewport()

Implements: IRadScrollViewport.InvalidateViewport()

Clamps the given scroll position so both axes stay within [0, extent - viewport], preventing the viewport from scrolling past the bounds of the canvas.

public Point ResetValue(Point currentValue, Size viewportSize, Size canvasSize)

Implements: IRadScrollViewport.ResetValue(Point, Size, Size)

Computes the minimum scroll offset, relative to currentScrollValue, required to bring childElement fully within the visible client area, accounting for its margin.

public virtual Size ScrollOffsetForChildVisible(RadElement childElement, Point currentScrollValue)

Implements: IRadScrollViewport.ScrollOffsetForChildVisible(RadElement, Point)