carbon.internal

Class PercentLayoutHelper

java.lang.Object

carbon.internal.PercentLayoutHelper

public class PercentLayoutHelper
extends java.lang.Object

Copied from Percent Support Library

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PercentLayoutHelper.PercentLayoutInfo Container for information about percentage dimensions and margins.
static interface	PercentLayoutHelper.PercentLayoutParams If a layout wants to support percentage based dimensions and use this helper class, its LayoutParams subclass must implement this interface.

Constructor Summary

Constructors

Constructor and Description
PercentLayoutHelper(android.view.ViewGroup host)

Method Summary

Modifier and Type	Method and Description
void	adjustChildren(int widthMeasureSpec, int heightMeasureSpec) Iterates over children and changes their width and height to one calculated from percentage values.
static void	fetchWidthAndHeight(android.view.ViewGroup.LayoutParams params, android.content.res.TypedArray array, int widthAttr, int heightAttr) Helper method to be called from ViewGroup.LayoutParams#setBaseAttributes override that reads layout_width and layout_height attribute values without throwing an exception if they aren't present.
static PercentLayoutHelper.PercentLayoutInfo	getPercentLayoutInfo(android.content.Context context, android.util.AttributeSet attrs) Constructs a PercentLayoutInfo from attributes associated with a View.
boolean	handleMeasuredStateTooSmall() Iterates over children and checks if any of them would like to get more space than it received through the percentage dimension.
void	restoreOriginalParams() Iterates over children and restores their original dimensions that were changed for percentage values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PercentLayoutHelper

public PercentLayoutHelper(android.view.ViewGroup host)

Method Detail

fetchWidthAndHeight

public static void fetchWidthAndHeight(android.view.ViewGroup.LayoutParams params,
                                       android.content.res.TypedArray array,
                                       int widthAttr,
                                       int heightAttr)

Helper method to be called from ViewGroup.LayoutParams#setBaseAttributes override that reads layout_width and layout_height attribute values without throwing an exception if they aren't present.

adjustChildren

public void adjustChildren(int widthMeasureSpec,
                           int heightMeasureSpec)

Iterates over children and changes their width and height to one calculated from percentage values.

Parameters:

widthMeasureSpec - Width MeasureSpec of the parent ViewGroup.

heightMeasureSpec - Height MeasureSpec of the parent ViewGroup.

getPercentLayoutInfo

public static PercentLayoutHelper.PercentLayoutInfo getPercentLayoutInfo(android.content.Context context,
                                                                         android.util.AttributeSet attrs)

Constructs a PercentLayoutInfo from attributes associated with a View. Call this method from LayoutParams(Context c, AttributeSet attrs) constructor.

restoreOriginalParams

public void restoreOriginalParams()

Iterates over children and restores their original dimensions that were changed for percentage values. Calling this method only makes sense if you previously called adjustChildren(int, int).

handleMeasuredStateTooSmall

public boolean handleMeasuredStateTooSmall()

Iterates over children and checks if any of them would like to get more space than it received through the percentage dimension.

If you are building a layout that supports percentage dimensions you are encouraged to take advantage of this method. The developer should be able to specify that a child should be remeasured by adding normal dimension attribute with wrap_content value. For example he might specify child's attributes as app:layout_widthPercent="60%p" and android:layout_width="wrap_content". In this case if the child receives too little space, it will be remeasured with width set to WRAP_CONTENT.

Returns:

True if the measure phase needs to be rerun because one of the children would like to receive more space.