| /* |
| * 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); |
| } |
| } |
