private static bool TryDeserializeStandardWebEventArgs(
string eventName,
JsonElement eventArgsJson,
[NotNullWhen(true)] out EventArgs?eventArgs)
{
// For back-compatibility, we recognize the built-in list of web event names and hard-code
// rules about the deserialization type for their eventargs. This makes it possible to declare
// an event handler as receiving EventArgs, and have it actually receive a subclass at runtime
// depending on the event that was raised.
//
// The following list should remain in sync with EventArgsFactory.ts.
switch (eventName)
{
case "input":
case "change":
// Special case for ChangeEventArgs because its value type can be one of
// several types, and System.Text.Json doesn't pick types dynamically
eventArgs = ChangeEventArgsReader.Read(eventArgsJson);
return(true);
case "copy":
case "cut":
case "paste":
eventArgs = ClipboardEventArgsReader.Read(eventArgsJson);
return(true);
case "drag":
case "dragend":
case "dragenter":
case "dragleave":
case "dragover":
case "dragstart":
case "drop":
eventArgs = DragEventArgsReader.Read(eventArgsJson);
return(true);
case "focus":
case "blur":
case "focusin":
case "focusout":
eventArgs = FocusEventArgsReader.Read(eventArgsJson);
return(true);
case "keydown":
case "keyup":
case "keypress":
eventArgs = KeyboardEventArgsReader.Read(eventArgsJson);
return(true);
case "contextmenu":
case "click":
case "mouseover":
case "mouseout":
case "mousemove":
case "mousedown":
case "mouseup":
case "dblclick":
eventArgs = MouseEventArgsReader.Read(eventArgsJson);
return(true);
case "error":
eventArgs = ErrorEventArgsReader.Read(eventArgsJson);
return(true);
case "loadstart":
case "timeout":
case "abort":
case "load":
case "loadend":
case "progress":
eventArgs = ProgressEventArgsReader.Read(eventArgsJson);
return(true);
case "touchcancel":
case "touchend":
case "touchmove":
case "touchenter":
case "touchleave":
case "touchstart":
eventArgs = TouchEventArgsReader.Read(eventArgsJson);
return(true);
case "gotpointercapture":
case "lostpointercapture":
case "pointercancel":
case "pointerdown":
case "pointerenter":
case "pointerleave":
case "pointermove":
case "pointerout":
case "pointerover":
case "pointerup":
eventArgs = PointerEventArgsReader.Read(eventArgsJson);
return(true);
case "wheel":
case "mousewheel":
eventArgs = WheelEventArgsReader.Read(eventArgsJson);
return(true);
case "toggle":
eventArgs = EventArgs.Empty;
return(true);
default:
// For custom event types, there are no built-in rules, so the deserialization type is
// determined by the parameter declared on the delegate.
eventArgs = null;
return(false);
}
}
public void Read_Works()
{
// Arrange
var args = new TouchEventArgs
{
AltKey = false,
CtrlKey = true,
MetaKey = true,
ShiftKey = false,
Type = "type1",
ChangedTouches = new[]
{
new TouchPoint
{
ClientX = 1.3,
ClientY = 2.9,
Identifier = 11,
PageX = 7.0,
PageY = 0.23,
ScreenX = 1.0,
ScreenY = 39.2
},
},
Detail = 789,
TargetTouches = new[]
{
new TouchPoint
{
ClientX = 2.3,
ClientY = 22.9,
Identifier = 8,
PageX = 786.0,
PageY = 1.4,
ScreenX = 5.0,
ScreenY = 9.2
},
new TouchPoint
{
ClientX = 12.3,
ClientY = 2.9,
Identifier = 17,
PageX = 6.3,
PageY = 13.4,
ScreenX = 4.0,
ScreenY = 7.2
},
},
Touches = new[]
{
new TouchPoint
{
ClientX = 6.8,
ClientY = 1.9,
Identifier = 3,
PageX = 2.3,
PageY = 3.4,
ScreenX = 4.1,
ScreenY = 8.0,
},
},
};
var jsonElement = GetJsonElement(args);
// Act
var result = TouchEventArgsReader.Read(jsonElement);
// Assert
Assert.Equal(args.AltKey, result.AltKey);
Assert.Equal(args.CtrlKey, result.CtrlKey);
Assert.Equal(args.MetaKey, result.MetaKey);
Assert.Equal(args.ShiftKey, result.ShiftKey);
Assert.Equal(args.Type, result.Type);
Assert.Equal(args.Detail, result.Detail);
AssertEqual(args.Touches, result.Touches);
AssertEqual(args.ChangedTouches, result.ChangedTouches);
AssertEqual(args.TargetTouches, result.TargetTouches);
}