WPF/Set-Resource.ps1
|
function Set-Resource { <# .Synopsis Sets a Resource that will be available across different handlers for a control. .Description Writing user interfaces effectively is about sharing information in between multiple controls. To do this, each control has a dictionary of resources, and a pointer to the parent control. Set-Resource puts items into the resource dictionary, so that other controls may access the items. You can use this to share data between controls. Set-Resource also allows you to store data at various depths. The default depth is 0. To store the information in the parent control, use -1. To store information in the grandparent control, use -2, etc. The greater the level that the resource is stored, the more universally it will be available. To find a resource, use the Get-Resource cmdlet. It is also useful to use Set-Resource to store references to controls so that other controls can access them. For instance, if there is a textbox, a button, and a listbox, you will need each control to be able to refer to the other controls in order to add items to the listbox that are typed into the textbox. The example demonstrates this technique. .Link Get-Resource .Example New-Grid -Rows '1*', 'Auto' { New-ListBox -On_Loaded { # When this Listbox is loaded, make it the resource "List" in # grid Set-Resource "List" $this -1 } New-Button -Row 1 "_Add" -On_Click { # Get the resource List (the Grid will have it) and add an item # to it $list = Get-Resource "List" $list.ItemsSource += @(Get-Random) } } -Show #> param( [String]$Name, $Value, [ValidateRange(-2147483648,0)] [Int] $Depth = 0, $Visual ) process { if (-not $visual) { $visual = $this } for ($i =0; $i -gt $Depth; $i--) { $Visual = $Visual.Parent if (-not $Visual) { break } } if (-not $Visual) { return } $Visual.Resources.$Name = $Value } } |