Input, Eventing and Mnemonics

Eventing and User Input

Just as Windows Forms had the need to pre-process input from mouse, keyb= oard, etc, so does “Avalon”. “Avalon” has re-used the concept of “= tunnel” and “bubble”ed<= /span> events from DHTML.

Bubbling event – starts at the element that raised the event, then goes up the parent chain.

Tunneling eve= nt – starts at the topmost element, then works its way to the element th= at started the commotion

RoutedEvents usually come = in pairs, e.g. PreviewMouseDown and MouseDown. The “Preview” events a= re the “Tunnel” versions, as it allows the parents to preview the event before the child element. …and necessarily, the follow-on event is the “BubbleR= 21; version.

An alternate way to handle events in WPF is <= span style=3D'mso-ascii-font-family:Tahoma;mso-hansi-font-family:Tahoma'>through= the use of commanding.

For more information on events, handling mouse and TextInput, read chapter 3 of Programming Windows Presentation Foundation by Chris Sells & Ian Griffiths.

Specifying access keys/mnemonics

Use “_” to specify the access key instead = of “&”

= <MenuItem Header =3D "E_xit" <= span style=3D'color:red'>Click=3D"= OnExitClicked"/= >

= </MenuItem>

</Menu>

For a Label, use the Target property to specify the UIElement should activate when the mnemonic is presse= d

&= lt;Window = x:= Class= =3D"WindowsApplication10.Window1"

<= span style=3D'mso-spacerun:yes'> xmlns= =3D"http://schemas.microsoft.com/winfx/2006/xaml/presentat= ion"

<= span style=3D'mso-spacerun:yes'> xmlns:x= =3D"http://schemas.microsoft.com/winfx/2006/xaml&qu= ot;

<= span style=3D'mso-spacerun:yes'> Title= =3D"WindowsApplication10"

Width= =3D"200"

<= span style=3D'mso-spacerun:yes'> Height= =3D"120"

<= span style=3D'mso-spacerun:yes'> >

<= span style=3D'mso-spacerun:yes'> <Grid = Ma= rgin= =3D"9">

<= span style=3D'mso-spacerun:yes'> <Grid.ColumnDefini= tions&= gt;

<= span style=3D'mso-spacerun:yes'> <ColumnDefinition = Wi= dth= =3D"Auto"/>

<= span style=3D'mso-spacerun:yes'> <ColumnDefinition = Wi= dth= =3D"*"/>

<= span style=3D'mso-spacerun:yes'> </Grid.ColumnDefinitions&= gt;

<= span style=3D'mso-spacerun:yes'>

<= span style=3D'mso-spacerun:yes'> <Label = Ta= rget= =3D"{Binding ElementName=3DaddressTB}"=

= Grid.Column=3D"0">A_ddress</Label<= span style=3D'color:blue'>>

<= span style=3D'mso-spacerun:yes'> <TextBox = Name=3D"addressTB" G= rid.Column= =3D"1" <= /span>

<= span style=3D'mso-spacerun:yes'> = VerticalAlignment=3D"Top"/>

<= span style=3D'mso-spacerun:yes'> <Button = Ho= rizontalAlignment= =3D"Right" <= span style=3D'color:red'>Grid.Column=3D= "1" <= /span>

Ve= rticalAlignment= =3D"Bottom">_Ok</Button= >

<= span style=3D'mso-spacerun:yes'> </Grid&= gt;

</Window&= gt;