Table of Contents

Class Panel

Namespace
GHIElectronics.Endpoint.UI.Controls
Assembly
GHIElectronics.Endpoint.UI.dll
public class Panel : UIElement
Inheritance
Panel
Derived
Inherited Members

Properties

Children 

public UIElementCollection Children { get; }

Property Value

UIElementCollection

Methods

MeasureOverride(int, int, out int, out int)

Measurement override. Implement your size-to-content logic here.

protected override void MeasureOverride(int availableWidth, int availableHeight, out int desiredWidth, out int desiredHeight)

Parameters

availableWidth int

Available size that parent can give to the child. May be MaxValue(when parent wants to measure to content). This is soft constraint. Child can return bigger size to indicate that it wants bigger space and hope that parent can throw in scrolling...

availableHeight int
desiredWidth int
desiredHeight int

Remarks

MeasureOverride is designed to be the main customizability point for size control of layout. UIElement authors should override this method, call Measure on each child UIElement, and compute their desired size based upon the measurement of the children. The return value should be the desired size.

Note: It is required that a parent UIElement calls Measure on each child or they won't be sized/arranged. Typical override follows a pattern roughly like this (pseudo-code): 
protected override void MeasureOverride(int avialableWidth, int availableHeight, out int desiredWidth, out int desiredHeight)
{
foreach (UIElement child in VisualChildren)
{
child.Measure(availableSize);
availableSize.Deflate(child.DesiredSize);
_cache.StoreInfoAboutChild(child);
}

         Size desired = CalculateBasedOnCache(_cache);
         return desired;
     }</code></pre></example>



The key aspects of this snippet are:

  • You must call Measure on each child UIElement
  • It is common to cache measurement information between the MeasureOverride and ArrangeOverride method calls
  • Calling base.MeasureOverride is not required.
  • Calls to Measure on children are passing either the same availableSize as the parent, or a subset of the area depending
on the type of layout the parent will perform (for example, it would be valid to remove the area
for some border or padding).
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