Silverlight: how to obtain the mouse wheel event and how to judge and obtain the combination key

Let's talk about how to get the scroll wheel event this time.

The mouse wheel event is not in the current version of beta2, but we can use the htmlpage object htmlpage (system. windows. browser;) (I have mentioned many times how to capture Silverlight right-click events and how to use cookies in Silverlight ).

Htmlpage. Window. attachevent ( " Dommousescroll " , Onmousewheel );
Htmlpage. Window. attachevent ( " Onmousewheel " , Onmousewheel );
Htmlpage. Document. attachevent ( " Onmousewheel " , Onmousewheel );

Private VoidOnmousewheel (ObjectSender, htmleventargs ARGs)
{

}

 

Then we will get a rotation angle attribute in the onmousewheel method.

However, the name of this attribute varies in different browsers.

From this angle, we can know that the mouse is rolling up or down.

Double Mousedelta =   0 ;
Scriptobject E = Args. eventobject;
If (E. getproperty ( " Detail " ) ! =   Null )
{ // Firefox and Apple
Mousedelta = (( Double ) E. getproperty ( " Detail " ));
}
Else   If (E. getproperty ( " Wheeldelta " ) ! =   Null )
{ // IE and opera
Mousedelta = (( Double ) E. getproperty ( " Wheeldelta " ));
}
Mousedelta = Math. Sign (mousedelta );
If (Mousedelta >   0 )
{
TXT. Text =   " Scroll up " ;
}
Else   If (Mousedelta < 0 )
{
TXT. Text =   " Scroll down " ;
}

 

Next, let's talk about how to obtain the keyboard keys (for example, we often press Ctrl + mouse or Ctrl + enter)

In fact, we only need to use an enumeration value.

Namespace System. Windows. Input
{
// Summary:
// Specifies the set of modifier keys.
[Flags]
Public   Enum Modifierkeys
{
// Summary:
// No modifiers are pressed.
None =   0 ,
//
// Summary:
// The ALT key is pressed.
ALT =   1 ,
//
// Summary:
// The ctrl key is pressed.
Control =   2 ,
//
// Summary:
// The shift key is pressed.
Shift =   4 ,
//
// Summary:
// The Windows logo key is pressed.
Windows =   8 ,
//
// Summary:
// The apple key (also known as the "Open apple key") is pressed.
Apple =   8 ,
}
}

Methods

Like registering a click event on the current page

This . Mouseleftbuttondown + =   New Mousebuttoneventhandler (page_mouseleftbuttondown );
Void Page_mouseleftbuttondown ( Object Sender, mousebuttoneventargs E)
{}

We need to perform a few operations in it to determine whether the user is still holding down a key on the keyboard.

 

Modifierkeys keys = Keyboard. modifiers;
TXT. Text =   "" ;
If (Keys & Modifierkeys. Shift) ! =   0 )
TXT. Text + =   " Shift " ;
If (Keys & Modifierkeys. alt) ! =   0 )
TXT. Text + =   " ALT " ;
If (Keys & Modifierkeys. Apple) ! =   0 )
TXT. Text + =   " Apple " ;
If (Keys & Modifierkeys. Control) ! =   0 )
TXT. Text + =   " CTRL " ;
If (Keys & Modifierkeys. Windows) ! =   0 )
TXT. Text + =   " Windows " ;
TXT. Text + =   " + Mouse clicks " ;

The above are some tips for my personal summary ~ I hope this technique will help you ^

Source code:Mouse_wheel_keys_event deom