/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.support.v4.view;
import android.os.Build;
import android.view.ViewGroup;
/**
* Helper for accessing API features in
* {@link android.view.ViewGroup.MarginLayoutParams MarginLayoutParams} added after API 4.
*/
public class MarginLayoutParamsCompat {
interface MarginLayoutParamsCompatImpl {
int getMarginStart(ViewGroup.MarginLayoutParams lp);
int getMarginEnd(ViewGroup.MarginLayoutParams lp);
void setMarginStart(ViewGroup.MarginLayoutParams lp, int marginStart);
void setMarginEnd(ViewGroup.MarginLayoutParams lp, int marginEnd);
boolean isMarginRelative(ViewGroup.MarginLayoutParams lp);
int getLayoutDirection(ViewGroup.MarginLayoutParams lp);
void setLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection);
void resolveLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection);
}
static class MarginLayoutParamsCompatImplBase implements MarginLayoutParamsCompatImpl {
@Override
public int getMarginStart(ViewGroup.MarginLayoutParams lp) {
return lp.leftMargin;
}
@Override
public int getMarginEnd(ViewGroup.MarginLayoutParams lp) {
return lp.rightMargin;
}
@Override
public void setMarginStart(ViewGroup.MarginLayoutParams lp, int marginStart) {
lp.leftMargin = marginStart;
}
@Override
public void setMarginEnd(ViewGroup.MarginLayoutParams lp, int marginEnd) {
lp.rightMargin = marginEnd;
}
@Override
public boolean isMarginRelative(ViewGroup.MarginLayoutParams lp) {
return false;
}
@Override
public int getLayoutDirection(ViewGroup.MarginLayoutParams lp) {
return ViewCompat.LAYOUT_DIRECTION_LTR;
}
@Override
public void setLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection) {
// No-op
}
@Override
public void resolveLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection) {
// No-op
}
}
static class MarginLayoutParamsCompatImplJbMr1 implements MarginLayoutParamsCompatImpl {
@Override
public int getMarginStart(ViewGroup.MarginLayoutParams lp) {
return MarginLayoutParamsCompatJellybeanMr1.getMarginStart(lp);
}
@Override
public int getMarginEnd(ViewGroup.MarginLayoutParams lp) {
return MarginLayoutParamsCompatJellybeanMr1.getMarginEnd(lp);
}
@Override
public void setMarginStart(ViewGroup.MarginLayoutParams lp, int marginStart) {
MarginLayoutParamsCompatJellybeanMr1.setMarginStart(lp, marginStart);
}
@Override
public void setMarginEnd(ViewGroup.MarginLayoutParams lp, int marginEnd) {
MarginLayoutParamsCompatJellybeanMr1.setMarginEnd(lp, marginEnd);
}
@Override
public boolean isMarginRelative(ViewGroup.MarginLayoutParams lp) {
return MarginLayoutParamsCompatJellybeanMr1.isMarginRelative(lp);
}
@Override
public int getLayoutDirection(ViewGroup.MarginLayoutParams lp) {
return MarginLayoutParamsCompatJellybeanMr1.getLayoutDirection(lp);
}
@Override
public void setLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection) {
MarginLayoutParamsCompatJellybeanMr1.setLayoutDirection(lp, layoutDirection);
}
@Override
public void resolveLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection) {
MarginLayoutParamsCompatJellybeanMr1.resolveLayoutDirection(lp, layoutDirection);
}
}
static final MarginLayoutParamsCompatImpl IMPL;
static {
final int version = Build.VERSION.SDK_INT;
if (version >= 17) { // jb-mr1
IMPL = new MarginLayoutParamsCompatImplJbMr1();
} else {
IMPL = new MarginLayoutParamsCompatImplBase();
}
}
/**
* Get the relative starting margin that was set.
*
* <p>On platform versions supporting bidirectional text and layouts
* this value will be resolved into the LayoutParams object's left or right
* margin as appropriate when the associated View is attached to a window
* or when the layout direction of that view changes.</p>
*
* @param lp LayoutParams to query
* @return the margin along the starting edge in pixels
*/
public static int getMarginStart(ViewGroup.MarginLayoutParams lp) {
return IMPL.getMarginStart(lp);
}
/**
* Get the relative ending margin that was set.
*
* <p>On platform versions supporting bidirectional text and layouts
* this value will be resolved into the LayoutParams object's left or right
* margin as appropriate when the associated View is attached to a window
* or when the layout direction of that view changes.</p>
*
* @param lp LayoutParams to query
* @return the margin along the ending edge in pixels
*/
public static int getMarginEnd(ViewGroup.MarginLayoutParams lp) {
return IMPL.getMarginEnd(lp);
}
/**
* Set the relative start margin.
*
* <p>On platform versions supporting bidirectional text and layouts
* this value will be resolved into the LayoutParams object's left or right
* margin as appropriate when the associated View is attached to a window
* or when the layout direction of that view changes.</p>
*
* @param lp LayoutParams to query
* @param marginStart the desired start margin in pixels
*/
public static void setMarginStart(ViewGroup.MarginLayoutParams lp, int marginStart) {
IMPL.setMarginStart(lp, marginStart);
}
/**
* Set the relative end margin.
*
* <p>On platform versions supporting bidirectional text and layouts
* this value will be resolved into the LayoutParams object's left or right
* margin as appropriate when the associated View is attached to a window
* or when the layout direction of that view changes.</p>
*
* @param lp LayoutParams to query
* @param marginEnd the desired end margin in pixels
*/
public static void setMarginEnd(ViewGroup.MarginLayoutParams lp, int marginEnd) {
IMPL.setMarginEnd(lp, marginEnd);
}
/**
* Check if margins are relative.
*
* @return true if either marginStart or marginEnd has been set.
*/
public static boolean isMarginRelative(ViewGroup.MarginLayoutParams lp) {
return IMPL.isMarginRelative(lp);
}
/**
* Retuns the layout direction. Can be either {@link ViewCompat#LAYOUT_DIRECTION_LTR} or
* {@link ViewCompat#LAYOUT_DIRECTION_RTL}.
*
* @return the layout direction.
*/
public static int getLayoutDirection(ViewGroup.MarginLayoutParams lp) {
return IMPL.getLayoutDirection(lp);
}
/**
* Set the layout direction.
*
* @param layoutDirection the layout direction.
* Should be either {@link ViewCompat#LAYOUT_DIRECTION_LTR}
* or {@link ViewCompat#LAYOUT_DIRECTION_RTL}.
*/
public static void setLayoutDirection(ViewGroup.MarginLayoutParams lp, int layoutDirection) {
IMPL.setLayoutDirection(lp, layoutDirection);
}
/**
* This will be called by {@link android.view.View#requestLayout()}. Left and Right margins
* may be overridden depending on layout direction.
*/
public static void resolveLayoutDirection(ViewGroup.MarginLayoutParams lp,
int layoutDirection) {
IMPL.resolveLayoutDirection(lp, layoutDirection);
}
}
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