119 lines
3.9 KiB
Java
119 lines
3.9 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.setupwizardlib.view;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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import android.widget.LinearLayout;
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import com.android.setupwizardlib.R;
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/**
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* An extension of LinearLayout that automatically switches to vertical orientation when it can't
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* fit its child views horizontally.
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*
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* <p>Modified from {@code com.android.internal.widget.ButtonBarLayout}
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*/
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public class ButtonBarLayout extends LinearLayout {
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private boolean stacked = false;
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private int originalPaddingLeft;
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private int originalPaddingRight;
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public ButtonBarLayout(Context context) {
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super(context);
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}
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public ButtonBarLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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setStacked(false);
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boolean needsRemeasure = false;
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int initialWidthMeasureSpec = widthMeasureSpec;
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if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) {
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// Measure with WRAP_CONTENT, so that we can compare the measured size with the
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// available size to see if we need to stack.
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initialWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
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// We'll need to remeasure again to fill excess space.
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needsRemeasure = true;
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}
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super.onMeasure(initialWidthMeasureSpec, heightMeasureSpec);
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if (getMeasuredWidth() > widthSize) {
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setStacked(true);
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// Measure again in the new orientation.
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needsRemeasure = true;
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}
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if (needsRemeasure) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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}
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private void setStacked(boolean stacked) {
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if (this.stacked == stacked) {
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return;
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}
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this.stacked = stacked;
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int childCount = getChildCount();
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for (int i = 0; i < childCount; i++) {
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View child = getChildAt(i);
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LayoutParams childParams = (LayoutParams) child.getLayoutParams();
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if (stacked) {
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child.setTag(R.id.suw_original_weight, childParams.weight);
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childParams.weight = 0;
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} else {
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Float weight = (Float) child.getTag(R.id.suw_original_weight);
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if (weight != null) {
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childParams.weight = weight;
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}
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}
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child.setLayoutParams(childParams);
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}
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setOrientation(stacked ? LinearLayout.VERTICAL : LinearLayout.HORIZONTAL);
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// Reverse the child order, so that the primary button is towards the top when vertical
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for (int i = childCount - 1; i >= 0; i--) {
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bringChildToFront(getChildAt(i));
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}
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if (stacked) {
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// HACK: In the default button bar style, the left and right paddings are not
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// balanced to compensate for different alignment for borderless (left) button and
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// the raised (right) button. When it's stacked, we want the buttons to be centered,
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// so we balance out the paddings here.
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originalPaddingLeft = getPaddingLeft();
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originalPaddingRight = getPaddingRight();
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int paddingHorizontal = Math.max(originalPaddingLeft, originalPaddingRight);
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setPadding(paddingHorizontal, getPaddingTop(), paddingHorizontal, getPaddingBottom());
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} else {
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setPadding(originalPaddingLeft, getPaddingTop(), originalPaddingRight, getPaddingBottom());
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}
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}
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}
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