OverlayCanvas Class Reference

An overlay canvas is a canvas for overlays which is on top of the DisplayCanvas in the visual tree. More...

Inherits Panel.

Public Member Functions
	OverlayCanvas ()
	Creates the overlay canvas.

Static Public Attributes
static readonly DependencyProperty	ActualZoomFactorProperty
	Backing store for the ActualZoomFactor property.
static readonly DependencyProperty	ParentDisplayCanvasProperty
	Backing store for the readonly ParentDisplayCanvas property.

Protected Member Functions
override Size	MeasureOverride (Size availableSize)
	Measures all child elements with infinite space. More...
override Size	ArrangeOverride (Size finalSize)
	Arranges all child elements depending on their coordinates and unit. More...

Static Protected Attributes
static readonly DependencyPropertyKey	ActualZoomFactorKey
	The Key for readonly ActualZoomFactor property.

Properties
double	ActualZoomFactor [get]
	Gets the actual zoom factor of the display canvas this overlay is on.
DisplayCanvas	ParentDisplayCanvas [get]
	The DisplayCanvas this overlay is child of. More...

Detailed Description

An overlay canvas is a canvas for overlays which is on top of the DisplayCanvas in the visual tree.

This canvas enables relative coordinates inside the full image extent and placing overlays in other overlays or non-overlay controls which have a DisplayCanvas visual parent.

Member Function Documentation

ArrangeOverride()

override Size ArrangeOverride ( Size  finalSize )

protected

Arranges all child elements depending on their coordinates and unit.

Parameters

finalSize

Size of the canvas.

Returns

Input size.

MeasureOverride()

override Size MeasureOverride ( Size  availableSize )

protected

Measures all child elements with infinite space.

First layout pass.

Parameters

availableSize

Ignored.

Returns

Empty size.

Property Documentation

ParentDisplayCanvas

DisplayCanvas ParentDisplayCanvas

get

The DisplayCanvas this overlay is child of.

null if no DisplayCanvas parent is present.