public App()
{
usernameentry = new MyEntry ();
usernameentry.WidthRequest = 100;
usernameentry.HeightRequest = 40;
usernameentry.Placeholder="username";
usernameentry.Top = 10;
usernameentry.BackgroundColor = Color.Yellow;
passentry = new MyEntry ();
passentry.WidthRequest = 100;
passentry.HeightRequest = 40;
passentry.Placeholder = "Password";
passentry.MarginTop = 20;
passentry.BackgroundColor = Color.FromRgb (102, 204, 255);
myStacklayout stacklayout = new myStacklayout ();
stacklayout.BackgroundColor=Color.FromRgb (170, 221, 255);
stacklayout.WidthRequest = 200;
stacklayout.HeightRequest = 100;
stacklayout.Top = 200;
stacklayout.addview (usernameentry);
stacklayout.addview (passentry);
relativelayout.addview (stacklayout);
okbut = new MyButton ();
okbut.HeightRequest = 40;
okbut.WidthRequest = 100;
okbut.Top = 400;
okbut.Text="Ok";
okbut.TextColor=Color.FromRgb (102, 204, 255);
okbut.BorderColor= Color.FromRgb (102, 204, 255);
okbut.BorderRadius = 2;
okbut.BackgroundColor= Color.White;
okbut.BorderWidth = 1;
relativelayout.addview (okbut);
}
public void addview(MyButton but)
{
Constraint y=Constraint.RelativeToParent (
(parent) => { return parent.Height / 2 - but.HeightRequest/2; } );
Constraint x=Constraint.RelativeToParent (
(parent) => { return parent.Width / 2 - but.WidthRequest/2; } );
if (but.Top.HasValue) {
y = Constraint.RelativeToParent (
(parent) => { return but.Top.HasValue?but.Top.Value:0; } );
}
if (but.Left.HasValue) {
x = Constraint.RelativeToParent (
(parent) => {
return but.Left.HasValue ? but.Left.Value : 0;
});
} else {
x = Constraint.RelativeToParent (
(parent) => {
return parent.Width / 2 - but.WidthRequest/2;
});
}
this.Children.Add (but, x, y);
}