RelativeLayout Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
A Layout<T> that uses Constraints to layout its children.
public class RelativeLayout : Xamarin.Forms.Layout<Xamarin.Forms.View>, Xamarin.Forms.IElementConfiguration<Xamarin.Forms.RelativeLayout>type RelativeLayout = class
inherit Layout<View>
interface IElementConfiguration<RelativeLayout>- Inheritance
-
System.ObjectRelativeLayout
- Implements
Remarks
The RelativeLayoutExample class in the following code extends the ContentPage class by adding a RelativeLayout that contains a heading and another label. Both labels are positioned relative to the ContentPage:
public class RelativeLayoutExample : ContentPage
{
public RelativeLayoutExample ()
{
this.Padding = new Thickness (10, Device.OnPlatform (20, 0, 0), 10, 5);
Label heading = new Label {
Text = "RelativeLayout Example",
TextColor = Color.Red,
};
Label relativelyPositioned = new Label {
Text = "Positioned relative to my parent."
};
RelativeLayout relativeLayout = new RelativeLayout ();
relativeLayout.Children.Add (heading, Constraint.RelativeToParent ((parent) => {
return 0;
}));
relativeLayout.Children.Add (relativelyPositioned,
Constraint.RelativeToParent ((parent) => {
return parent.Width / 3;
}),
Constraint.RelativeToParent ((parent) => {
return parent.Height / 2;
}));
this.Content = relativeLayout;
}
}
For a more complete example that exercises many more of the layout options for the RelativeLayout class, see the FormsGallery sample that can be found on the Sample Applications page.
Constructors
| RelativeLayout() |
Creates a new RelativeLayout with default values. |
Fields
| BoundsConstraintProperty |
Identifies the bindable property associated with GetBoundsConstraint(BindableObject)/SetBoundsConstraint(BindableObject, BoundsConstraint). |
| HeightConstraintProperty |
Identifies the bindable property associated with the GetHeightConstraint(BindableObject) / SetHeightConstraint(BindableObject, Constraint) methods. |
| WidthConstraintProperty |
Identifies the width constraint. |
| XConstraintProperty |
Identifies the constraint on X. |
| YConstraintProperty |
Identifies the constraint on Y. |
Properties
| AnchorX |
Gets or sets the X component of the center point for any transform, relative to the bounds of the element. This is a bindable property. (Inherited from VisualElement) |
| AnchorY |
Gets or sets the Y component of the center point for any transform, relative to the bounds of the element. This is a bindable property. (Inherited from VisualElement) |
| AutomationId |
Gets or sets a value that allows the automation framework to find and interact with this element. (Inherited from Element) |
| Background | (Inherited from VisualElement) |
| BackgroundColor |
Gets or sets the color which will fill the background of a VisualElement. This is a bindable property. (Inherited from VisualElement) |
| Batched |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| Behaviors |
Gets the list of Behaviors associated to this element. This is a bindable property. (Inherited from VisualElement) |
| BindingContext |
Gets or sets object that contains the properties that will be targeted by the bound properties that belong to this BindableObject. (Inherited from BindableObject) |
| Bounds |
Gets the bounds of the element. (Inherited from VisualElement) |
| CascadeInputTransparent |
Gets or sets a value that controls whether child elements inherit the input transparency of |
| Children |
List of Views that are children of this RelativeLayout. |
| class | (Inherited from NavigableElement) |
| ClassId |
Gets or sets a value used to identify a collection of semantically similar elements. (Inherited from Element) |
| Clip | (Inherited from VisualElement) |
| DisableLayout |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| Dispatcher | (Inherited from BindableObject) |
| EffectControlProvider |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| Effects |
A list of the effects that are applied to this item. (Inherited from Element) |
| FlowDirection |
Gets or sets the layout flow direction. (Inherited from VisualElement) |
| GestureController |
Gets the gesture controller for the view. (Inherited from View) |
| GestureRecognizers |
The collection of gesture recognizers associated with this view. (Inherited from View) |
| Height |
Gets the current rendered height of this element. This is a read-only bindable property. (Inherited from VisualElement) |
| HeightRequest |
Gets or sets the desired height override of this element. (Inherited from VisualElement) |
| HorizontalOptions |
Gets or sets the LayoutOptions that define how the element gets laid in a layout cycle. This is a bindable property. (Inherited from View) |
| Id |
Gets a value that can be used to uniquely identify an element through the run of an application. (Inherited from Element) |
| InputTransparent |
Gets or sets a value indicating whether this element should be involved in the user interaction cycle. This is a bindable property. (Inherited from VisualElement) |
| IsClippedToBounds |
Gets or sets a value which determines if the Layout should clip its children to its bounds. (Inherited from Layout) |
| IsEnabled |
Gets or sets a value indicating whether this element is enabled in the user interface. This is a bindable property. (Inherited from VisualElement) |
| IsFocused |
Gets a value indicating whether this element is focused currently. This is a bindable property. (Inherited from VisualElement) |
| IsInNativeLayout |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| IsNativeStateConsistent |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| IsPlatformEnabled |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| IsTabStop |
Gets or sets a value that indicates whether this element is included in tab navigation. This is a bindable property. (Inherited from VisualElement) |
| IsVisible |
Gets or sets a value that determines whether this elements should be part of the visual tree or not. This is a bindable property. (Inherited from VisualElement) |
| LogicalChildren |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| Margin |
Gets or sets the margin for the view. (Inherited from View) |
| MinimumHeightRequest |
Gets or sets a value which overrides the minimum height the element will request during layout. (Inherited from VisualElement) |
| MinimumWidthRequest |
Gets or sets a value which overrides the minimum width the element will request during layout. (Inherited from VisualElement) |
| Navigation | (Inherited from NavigableElement) |
| NavigationProxy | (Inherited from NavigableElement) |
| Opacity |
Gets or sets the opacity value applied to the element when it is rendered. This is a bindable property. (Inherited from VisualElement) |
| Padding |
Gets or sets the inner padding of the Layout. (Inherited from Layout) |
| Parent |
Gets or sets the parent element of the element. (Inherited from Element) |
| ParentView |
Obsolete.
Gets the element which is the closest ancestor of this element that is a VisualElement. (Inherited from Element) |
| Platform |
Obsolete.
(Inherited from Element)
|
| RealParent |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| Resources |
Gets or sets the local resource dictionary. (Inherited from VisualElement) |
| Rotation |
Gets or sets the rotation (in degrees) about the Z-axis (affine rotation) when the element is rendered. (Inherited from VisualElement) |
| RotationX |
Gets or sets the rotation (in degrees) about the X-axis (perspective rotation) when the element is rendered. (Inherited from VisualElement) |
| RotationY |
Gets or sets the rotation (in degrees) about the Y-axis (perspective rotation) when the element is rendered. (Inherited from VisualElement) |
| Scale |
Gets or sets the scale factor applied to the element. (Inherited from VisualElement) |
| ScaleX |
Gets or sets a scale value to apply to the X direction. (Inherited from VisualElement) |
| ScaleY |
Gets or sets a scale value to apply to the Y direction. (Inherited from VisualElement) |
| Style | (Inherited from NavigableElement) |
| StyleClass | (Inherited from NavigableElement) |
| StyleId |
Gets or sets a user defined value to uniquely identify the element. (Inherited from Element) |
| TabIndex | (Inherited from VisualElement) |
| TranslationX |
Gets or sets the X translation delta of the element. (Inherited from VisualElement) |
| TranslationY |
Gets or sets the Y translation delta of the element. (Inherited from VisualElement) |
| Triggers |
Gets the list of Trigger associated to this element. This is a bindable property. (Inherited from VisualElement) |
| VerticalOptions |
Gets or sets the LayoutOptions that define how the element gets laid in a layout cycle. This is a bindable property. (Inherited from View) |
| Visual | (Inherited from VisualElement) |
| Width |
Gets the current rendered width of this element. This is a read-only bindable property. (Inherited from VisualElement) |
| WidthRequest |
Gets or sets the desired width override of this element. (Inherited from VisualElement) |
| X |
Gets the current X position of this element. This is a read-only bindable property. (Inherited from VisualElement) |
| Y |
Gets the current Y position of this element. This is a read-only bindable property. (Inherited from VisualElement) |
Methods
| ApplyBindings() |
Apply the bindings to BindingContext. (Inherited from BindableObject) |
| BatchBegin() |
Signals the start of a batch of changes to the elements properties. (Inherited from VisualElement) |
| BatchCommit() |
Signals the end of a batch of commands to the element and that those commands should now be committed. (Inherited from VisualElement) |
| ChangeVisualState() |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| ClearValue(BindableProperty) |
Clears any value set by SetValue for |
| ClearValue(BindablePropertyKey) |
Clears any value set by SetValue for the property that is identified by |
| CoerceValue(BindableProperty) | (Inherited from BindableObject) |
| CoerceValue(BindablePropertyKey) | (Inherited from BindableObject) |
| Descendants() |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| EffectIsAttached(String) |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| FindByName(String) |
Returns the element that has the specified name. (Inherited from Element) |
| Focus() |
Attemps to set focus to this element. (Inherited from VisualElement) |
| ForceLayout() |
Forces a layout cycle on the element and all of its descendants. (Inherited from Layout) |
| GetBoundsConstraint(BindableObject) |
Returns the bounds constraint of the |
| GetChildElements(Point) |
Returns the child elements that are visually beneath the specified |
| GetHeightConstraint(BindableObject) |
Returns the height constraint of the |
| GetSizeRequest(Double, Double) |
Obsolete.
Returns the SizeRequest of the Layout. Calling this method begins the measure pass of a layout cycle. (Inherited from Layout) |
| GetValue(BindableProperty) |
Returns the value that is contained in the BindableProperty. (Inherited from BindableObject) |
| GetValues(BindableProperty, BindableProperty) |
Obsolete.
For internal use by the Xamarin.Forms platform. (Inherited from BindableObject) |
| GetValues(BindableProperty, BindableProperty, BindableProperty) |
Obsolete.
For internal use by the Xamarin.Forms platform. (Inherited from BindableObject) |
| GetWidthConstraint(BindableObject) |
Returns the width constraint of the |
| GetXConstraint(BindableObject) |
Returns the X constraint of the |
| GetYConstraint(BindableObject) |
Returns the Y constraint of the |
| InvalidateLayout() |
Invalidates the current layout. (Inherited from Layout) |
| InvalidateMeasure() |
Method that is called to invalidate the layout of this VisualElement. Raises the MeasureInvalidated event. (Inherited from VisualElement) |
| InvalidateMeasureNonVirtual(InvalidationTrigger) |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| IsSet(BindableProperty) |
Returns |
| Layout(Rectangle) |
Updates the bounds of the element during the layout cycle. (Inherited from VisualElement) |
| LayoutChildren(Double, Double, Double, Double) |
Lays out the Children in the specified rectangle. |
| LowerChild(View) |
Sends a child to the back of the visual stack. (Inherited from Layout) |
| Measure(Double, Double, MeasureFlags) |
Returns the minimum size that a visual element needs in order to be displayed on the device. (Inherited from VisualElement) |
| NativeSizeChanged() |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| On<T>() |
Returns the configuration object that the developer can use to call platform-specific methods for the layout. |
| OnAdded(T) |
Invoked when a child is added to the layout. Implement this method to add class handling for this event. (Inherited from Layout<T>) |
| OnAdded(View) | |
| OnBindingContextChanged() |
Invoked whenever the binding context of the View changes. Override this method to add class handling for this event. (Inherited from View) |
| OnChildAdded(Element) |
Application developers can override this method to respond when a child is added. (Inherited from Layout<T>) |
| OnChildMeasureInvalidated() |
Invoked whenever a child of the layout has emitted MeasureInvalidated. Implement this method to add class handling for this event. (Inherited from Layout) |
| OnChildMeasureInvalidated(Object, EventArgs) |
Invoked whenever a child of the layout has emitted MeasureInvalidated. Implement this method to add class handling for this event. (Inherited from Layout) |
| OnChildRemoved(Element) |
Obsolete.
Application developers can override this method to respond when a child is removed. (Inherited from Layout<T>) |
| OnChildRemoved(Element, Int32) | (Inherited from Layout<T>) |
| OnChildrenReordered() |
Invoked whenever the ChildrenReordered event is about to be emitted. Implement this method to add class handling for this event. (Inherited from VisualElement) |
| OnMeasure(Double, Double) |
Method that is called when a layout measurement happens. (Inherited from VisualElement) |
| OnParentSet() | (Inherited from NavigableElement) |
| OnPropertyChanged(String) |
Method that is called when a bound property is changed. (Inherited from Element) |
| OnPropertyChanging(String) |
Call this method from a child class to notify that a change is going to happen on a property. (Inherited from BindableObject) |
| OnRemoved(T) |
Invoked when a child is removed from the layout. Implement this method to add class handling for this event. (Inherited from Layout<T>) |
| OnRemoved(View) | |
| OnSizeAllocated(Double, Double) |
This method is called when the size of the element is set during a layout cycle. This method is called directly before the SizeChanged event is emitted. Implement this method to add class handling for this event. (Inherited from Layout) |
| OnSizeRequest(Double, Double) |
Obsolete.
Called when this RelativeLayout has received a size request. |
| OnTabIndexPropertyChanged(Int32, Int32) | (Inherited from VisualElement) |
| OnTabStopPropertyChanged(Boolean, Boolean) | (Inherited from VisualElement) |
| RaiseChild(View) |
Sends a child to the front of the visual stack. (Inherited from Layout) |
| RemoveBinding(BindableProperty) |
Removes a previously set binding. (Inherited from BindableObject) |
| RemoveDynamicResource(BindableProperty) |
Removes a previously set dynamic resource (Inherited from Element) |
| ResolveLayoutChanges() | (Inherited from Layout) |
| SetBinding(BindableProperty, BindingBase) |
Assigns a binding to a property. (Inherited from BindableObject) |
| SetBoundsConstraint(BindableObject, BoundsConstraint) |
Sets |
| SetDynamicResource(BindableProperty, String) |
Sets the BindableProperty property of this element to be updated via the DynamicResource with the provided key. (Inherited from Element) |
| SetHeightConstraint(BindableObject, Constraint) |
Sets |
| SetValue(BindableProperty, Object) |
Sets the value of the specified property. (Inherited from BindableObject) |
| SetValue(BindablePropertyKey, Object) |
Sets the value of the propertyKey. (Inherited from BindableObject) |
| SetValueCore(BindableProperty, Object, SetValueFlags) |
For internal use by the Xamarin.Forms platform. (Inherited from BindableObject) |
| SetValueFromRenderer(BindableProperty, Object) |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| SetValueFromRenderer(BindablePropertyKey, Object) |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| SetWidthConstraint(BindableObject, Constraint) |
Sets |
| SetXConstraint(BindableObject, Constraint) |
Sets |
| SetYConstraint(BindableObject, Constraint) |
Sets |
| ShouldInvalidateOnChildAdded(View) |
When implemented, should return |
| ShouldInvalidateOnChildRemoved(View) |
When implemented, should return |
| SizeAllocated(Double, Double) |
SizeAllocated is called during a layout cycle to signal the start of a sub-tree layout. (Inherited from VisualElement) |
| TabIndexDefaultValueCreator() | (Inherited from VisualElement) |
| TabStopDefaultValueCreator() | (Inherited from VisualElement) |
| UnapplyBindings() |
Unapplies all previously set bindings. (Inherited from BindableObject) |
| Unfocus() |
Unsets focus to this element. (Inherited from VisualElement) |
| UpdateChildrenLayout() |
Instructs the layout to relayout all of its children. (Inherited from Layout) |
Events
| BatchCommitted |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| BindingContextChanged |
Raised whenever the BindingContext property changes. (Inherited from BindableObject) |
| ChildAdded |
Occurs whenever a child element is added to the element. (Inherited from Element) |
| ChildRemoved |
Occurs whenever a child element is removed from the element. (Inherited from Element) |
| ChildrenReordered |
Occurs when the Children of a VisualElement have been re-ordered. (Inherited from VisualElement) |
| DescendantAdded |
Occurs whenever a child element is added to the elements subtree. (Inherited from Element) |
| DescendantRemoved |
Occurs whenever a child element is removed from the elements subtree. (Inherited from Element) |
| FocusChangeRequested |
For internal use by the Xamarin.Forms platform. (Inherited from VisualElement) |
| Focused |
Occurs when the element receives focus. (Inherited from VisualElement) |
| LayoutChanged |
Occurs at the end of a layout cycle if any of the child element's Bounds have changed. (Inherited from Layout) |
| MeasureInvalidated |
Event that is raised when the layout of a visual element is invalidated. (Inherited from VisualElement) |
| PlatformSet |
Obsolete.
(Inherited from Element)
|
| PropertyChanged |
Raised when a property has changed. (Inherited from BindableObject) |
| PropertyChanging |
Raised when a property is about to change. (Inherited from BindableObject) |
| SizeChanged |
Occurs when either the Width or the Height properties change value on this element. (Inherited from VisualElement) |
| Unfocused |
Occurs when the element loses focus. (Inherited from VisualElement) |
Explicit Interface Implementations
| IDynamicResourceHandler.SetDynamicResource(BindableProperty, String) |
For internal use by the Xamarin.Forms platform. (Inherited from BindableObject) |
| IElementController.SetValueFromRenderer(BindableProperty, Object) |
For internal use by the Xamarin.Forms platform. (Inherited from Element) |
| IGestureController.CompositeGestureRecognizers |
For internal use by the Xamarin.Forms platform. (Inherited from View) |
| INameScope.RegisterName(String, Object) |
For internal use only. (Inherited from Element) |
| IVisualElementController.EffectiveFlowDirection |
Gets the effective visual flow direction for the element on the platform, taking into account the locale and logical flow settings. (Inherited from VisualElement) |
| IVisualElementController.InvalidateMeasure(InvalidationTrigger) |
This method is for internal use. (Inherited from VisualElement) |