| /* |
| * Copyright (C) 2015 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.car.ui; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.widget.FrameLayout; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Acts as a container to make the width of all its children not larger than the setup max width. |
| * |
| * To use MaxWidthLayout, put it as the outermost layout of all children you want to limit its max |
| * width and set the maxWidth appropriately. |
| * @hide |
| */ |
| public class MaxWidthLayout extends FrameLayout { |
| |
| // If mMaxChildrenWidth == 0, it means that it doesn't set the max width, just use the current |
| // width directly. |
| private int mMaxChildrenWidth; |
| |
| public MaxWidthLayout(Context context) { |
| super(context); |
| initialize(context.obtainStyledAttributes(R.styleable.MaxWidthLayout)); |
| } |
| |
| public MaxWidthLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| initialize(context.obtainStyledAttributes(attrs, R.styleable.MaxWidthLayout)); |
| } |
| |
| public MaxWidthLayout(Context context, AttributeSet attrs, int defStyleAttr) { |
| super(context, attrs, defStyleAttr); |
| initialize(context |
| .obtainStyledAttributes(attrs, R.styleable.MaxWidthLayout, defStyleAttr, 0)); |
| } |
| |
| /** |
| * Initialize MaxWidthLayout specific attributes and recycle the TypeArray. |
| */ |
| private void initialize(TypedArray ta) { |
| mMaxChildrenWidth = (int) (ta.getDimension(R.styleable.MaxWidthLayout_carMaxWidth, 0)); |
| ta.recycle(); |
| } |
| |
| /** |
| * Re-measure the child width if it is greater than max width. |
| */ |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| if (mMaxChildrenWidth == 0) { |
| return; |
| } |
| |
| final List<View> matchParentChildren = new ArrayList<View>(); |
| for (int i = getChildCount() - 1; i >= 0; --i) { |
| final View child = getChildAt(i); |
| if (child.getVisibility() != GONE) { |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| if (lp.width == LayoutParams.MATCH_PARENT) { |
| matchParentChildren.add(child); |
| } |
| } |
| } |
| for (int i = matchParentChildren.size() - 1; i >= 0; --i) { |
| final View child = matchParentChildren.get(i); |
| final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); |
| if (child.getMeasuredWidth() > mMaxChildrenWidth) { |
| int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( |
| mMaxChildrenWidth - lp.leftMargin - lp.rightMargin, MeasureSpec.EXACTLY); |
| int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( |
| child.getMeasuredHeight(), MeasureSpec.EXACTLY); |
| child.measure(childWidthMeasureSpec, childHeightMeasureSpec); |
| } |
| } |
| } |
| } |