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public interface Layout
Provides methods for an actor to participate in layout and to provide a minimum, preferred, and maximum size.
Method Summary | |
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float |
getMaxHeight()
|
float |
getMaxWidth()
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float |
getMinHeight()
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float |
getMinWidth()
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float |
getPrefHeight()
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float |
getPrefWidth()
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void |
invalidate()
Invalidates this actor's layout, causing layout() to happen the next time validate() is called. |
void |
invalidateHierarchy()
Invalidates this actor and all its parents, calling invalidate() on all involved actors. |
void |
layout()
Computes and caches any information needed for drawing and, if this actor has children, positions and sizes each child, calls invalidate() any each child whose width or height has changed, and calls validate() on each child. |
void |
pack()
Sizes this actor to its preferred width and height and, if this changed the size, causes the actor to be laid out by calling invalidate() then validate() . |
void |
setFillParent(boolean fillParent)
If true, this actor will be sized to the parent in validate() . |
void |
setLayoutEnabled(boolean enabled)
Enables or disables the layout for this actor and all child actors, recursively. |
void |
validate()
Ensures the actor has been laid out. |
Method Detail |
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void layout()
invalidate()
any each child whose width or height has changed, and calls validate()
on each child.
This method should almost never be called directly, instead validate()
should be used.
void invalidate()
layout()
to happen the next time validate()
is called. This
method should be called when state changes in the actor that requires a layout but does not change the minimum, preferred,
maximum, or actual size of the actor (meaning it does not affect the parent actor's layout).
void invalidateHierarchy()
invalidate()
on all involved actors. This method should be
called when state changes in the actor that affects the minimum, preferred, maximum, or actual size of the actor (meaning it
it potentially affects the parent actor's layout).
void validate()
layout()
if invalidate()
has called since the last time
validate()
was called, or if the actor otherwise needs to be laid out. This method is usually called in
Actor.draw(SpriteBatch, float)
before drawing is performed.
void pack()
invalidate()
then validate()
.
Generally this method should not be called in an actor's constructor because it calls layout()
, which means a
subclass would have layout() called before the subclass' constructor. Instead, in constructors, simply set the actors width
and height to getPrefWidth()
and getPrefHeight()
. This allows the actor to have a size at construction
time for more convenient use outside of a Table
.
void setFillParent(boolean fillParent)
validate()
. If the parent is the stage, the actor will be sized
to the stage.
void setLayoutEnabled(boolean enabled)
validate()
will not
cause a layout to occur. This is useful when an actor will be manipulated externally, such as with actions. Default is true.
float getMinWidth()
float getMinHeight()
float getPrefWidth()
float getPrefHeight()
float getMaxWidth()
float getMaxHeight()
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