Code
其源代码可以在 GitHub 中找到:https://github.com/brminnick/GridToRelativeLayout https://github.com/brminnick/GridToRelativeLayout
public class RelativeLayoutPage : ContentPage
{
public RelativeLayoutPage()
{
var emptyLabel = new Label
{
Text = "Empty Label",
Margin = new Thickness(10, 0, 10, 0),
FontSize = 18,
TextColor = Color.Gray,
HorizontalTextAlignment = TextAlignment.Center
};
var resetPointsButton = new Button
{
BackgroundColor = Color.FromHex("E19A3F"),
Text = "Reset points?",
TextColor = Color.White,
FontAttributes = FontAttributes.Bold,
};
switch (Device.RuntimePlatform)
{
case Device.Android:
resetPointsButton.FontSize = 20;
break;
case Device.iOS:
resetPointsButton.FontSize = 25;
break;
}
var msg1Label = new Label
{
Text = "msg1",
Margin = new Thickness(0, 26, 0, 0)
};
var msg2Label = new Label
{
Text = "msg2",
Margin = new Thickness(0, 26, 0, 0)
};
var msg3Label = new Label
{
Text = "msg3",
Margin = new Thickness(0, 26, 0, 0)
};
var faveLabel = new Label { Text = "Fave Label" };
var wordTypeLabel = new Label { Text = "Word Type Label" };
var textLabel = new Label
{
Text = "Text Label",
FontSize = 45,
HorizontalTextAlignment = TextAlignment.Center,
VerticalTextAlignment = TextAlignment.Center
};
var detail1Label = new Label
{
Text = "Detail 1 Label",
Margin = new Thickness(10, 0)
};
var detail2Label = new Label
{
Text = "Detail 2 Label",
Margin = new Thickness(10, 0)
};
var detail3Label = new Label
{
Text = "Detail 3 Label",
Margin = new Thickness(10, 0)
};
var zeroButton = new Button
{
Text = "0",
Margin = new Thickness(0, 0, 0, 20)
};
var oneButton = new Button
{
Text = "1",
Margin = new Thickness(0, 0, 0, 20)
};
var twoButton = new Button
{
Text = "2",
Margin = new Thickness(0, 0, 0, 20)
};
var fiveButton = new Button
{
Text = "5",
Margin = new Thickness(0, 0, 0, 20)
};
var tapScreenLabel = new Label
{
Text = "Tap Screen",
Margin = new Thickness(0, 0, 0, 20),
VerticalTextAlignment = TextAlignment.Center,
VerticalOptions = LayoutOptions.Center
};
Func<RelativeLayout, double> GetZeroButtonHeight = parent => zeroButton.Measure(parent.Width, parent.Height).Request.Height;
Func<RelativeLayout, double> GetOneButtonHeight = parent => oneButton.Measure(parent.Width, parent.Height).Request.Height;
Func<RelativeLayout, double> GetTwoButtonHeight = parent => twoButton.Measure(parent.Width, parent.Height).Request.Height;
Func<RelativeLayout, double> GetFiveButtonHeight = parent => fiveButton.Measure(parent.Width, parent.Height).Request.Height;
var relativeLayout = new RelativeLayout();
relativeLayout.Children.Add(emptyLabel,
Constraint.Constant(0),
Constraint.Constant(0),
Constraint.RelativeToParent(parent => parent.Width));
relativeLayout.Children.Add(resetPointsButton,
Constraint.Constant(0),
Constraint.Constant(0),
Constraint.RelativeToParent(parent => parent.Width));
relativeLayout.Children.Add(msg1Label,
Constraint.Constant(25),
Constraint.RelativeToView(resetPointsButton, (parent, view) => view.Y + view.Height),
Constraint.RelativeToParent(parent => parent.Width * 0.25));
relativeLayout.Children.Add(msg2Label,
Constraint.RelativeToView(msg1Label, (parent, view) => view.X + view.Width),
Constraint.RelativeToView(resetPointsButton, (parent, view) => view.Y + view.Height),
Constraint.RelativeToParent(parent => parent.Width * 0.25));
relativeLayout.Children.Add(msg3Label,
Constraint.RelativeToView(msg2Label, (parent, view) => view.X + view.Width),
Constraint.RelativeToView(resetPointsButton, (parent, view) => view.Y + view.Height),
Constraint.RelativeToParent(parent => parent.Width * 0.5));
relativeLayout.Children.Add(faveLabel,
Constraint.Constant(25),
Constraint.RelativeToView(msg1Label, (parent, view) => view.Y + view.Height + 20),
Constraint.RelativeToParent(parent => parent.Width * 0.25));
relativeLayout.Children.Add(wordTypeLabel,
Constraint.RelativeToView(faveLabel, (parent, view) => view.X + view.Width),
Constraint.RelativeToView(msg1Label, (parent, view) => view.Y + view.Height + 20),
Constraint.RelativeToParent(parent => parent.Width * 0.25));
relativeLayout.Children.Add(textLabel,
Constraint.Constant(20),
Constraint.RelativeToView(faveLabel, (parent, view) => view.Y + view.Height + 20),
Constraint.RelativeToParent(parent => parent.Width - 40),
Constraint.RelativeToParent(parent => parent.Height * 0.25));
relativeLayout.Children.Add(detail1Label,
Constraint.Constant(20),
Constraint.RelativeToView(textLabel, (parent, view) => view.Y + view.Height + 20));
relativeLayout.Children.Add(detail2Label,
Constraint.Constant(20),
Constraint.RelativeToView(detail1Label, (parent, view) => view.Y + view.Height));
relativeLayout.Children.Add(detail3Label,
Constraint.Constant(20),
Constraint.RelativeToView(detail2Label, (parent, view) => view.Y + view.Height));
relativeLayout.Children.Add(zeroButton,
Constraint.Constant(40),
Constraint.RelativeToParent(parent => parent.Height - GetZeroButtonHeight(parent) - 40),
Constraint.RelativeToParent(parent => (parent.Width - 80) / 4));
relativeLayout.Children.Add(oneButton,
Constraint.RelativeToView(zeroButton, (parent, view) => view.X + view.Width),
Constraint.RelativeToParent(parent => parent.Height - GetZeroButtonHeight(parent) - 40),
Constraint.RelativeToParent(parent => (parent.Width - 80) / 4));
relativeLayout.Children.Add(twoButton,
Constraint.RelativeToView(oneButton, (parent, view) => view.X + view.Width),
Constraint.RelativeToParent(parent => parent.Height - GetZeroButtonHeight(parent) - 40),
Constraint.RelativeToParent(parent => (parent.Width - 80) / 4));
relativeLayout.Children.Add(fiveButton,
Constraint.RelativeToView(twoButton, (parent, view) => view.X + view.Width),
Constraint.RelativeToParent(parent => parent.Height - GetZeroButtonHeight(parent) - 40),
Constraint.RelativeToParent(parent => (parent.Width - 80) / 4));
relativeLayout.Children.Add(tapScreenLabel,
Constraint.Constant(20),
Constraint.RelativeToView(zeroButton, (parent, view) => view.Y),
Constraint.RelativeToParent(parent => parent.Width - 40));
Padding = GetPadding();
Content = relativeLayout;
}
Thickness GetPadding()
{
switch (Device.RuntimePlatform)
{
case Device.iOS:
return new Thickness(0, 20, 0, 0);
default:
return default(Thickness);
}
}
}
iOS Demo
安卓演示