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/*
* Copyright (C) 2017 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 com.android.setupwizardlib.view;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import com.android.setupwizardlib.R;
/**
* An extension of LinearLayout that automatically switches to vertical orientation when it can't
* fit its child views horizontally.
*
* Modified from {@code com.android.internal.widget.ButtonBarLayout}
*/
public class ButtonBarLayout extends LinearLayout {
private boolean mStacked = false;
private int mOriginalPaddingLeft;
private int mOriginalPaddingRight;
public ButtonBarLayout(Context context) {
super(context);
}
public ButtonBarLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
setStacked(false);
boolean needsRemeasure = false;
int initialWidthMeasureSpec = widthMeasureSpec;
if (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) {
// Measure with WRAP_CONTENT, so that we can compare the measured size with the
// available size to see if we need to stack.
initialWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
// We'll need to remeasure again to fill excess space.
needsRemeasure = true;
}
super.onMeasure(initialWidthMeasureSpec, heightMeasureSpec);
if (getMeasuredWidth() > widthSize) {
setStacked(true);
// Measure again in the new orientation.
needsRemeasure = true;
}
if (needsRemeasure) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
private void setStacked(boolean stacked) {
if (mStacked == stacked) {
return;
}
mStacked = stacked;
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
LayoutParams childParams = (LayoutParams) child.getLayoutParams();
if (stacked) {
child.setTag(R.id.suw_original_weight, childParams.weight);
childParams.weight = 0;
} else {
Float weight = (Float) child.getTag(R.id.suw_original_weight);
if (weight != null) {
childParams.weight = weight;
}
}
child.setLayoutParams(childParams);
}
setOrientation(stacked ? LinearLayout.VERTICAL : LinearLayout.HORIZONTAL);
// Reverse the child order, so that the primary button is towards the top when vertical
for (int i = childCount - 1; i >= 0; i--) {
bringChildToFront(getChildAt(i));
}
if (stacked) {
// HACK: In the default button bar style, the left and right paddings are not
// balanced to compensate for different alignment for borderless (left) button and
// the raised (right) button. When it's stacked, we want the buttons to be centered,
// so we balance out the paddings here.
mOriginalPaddingLeft = getPaddingLeft();
mOriginalPaddingRight = getPaddingRight();
int paddingHorizontal = Math.max(mOriginalPaddingLeft, mOriginalPaddingRight);
setPadding(
paddingHorizontal, getPaddingTop(), paddingHorizontal, getPaddingBottom());
} else {
setPadding(
mOriginalPaddingLeft,
getPaddingTop(),
mOriginalPaddingRight,
getPaddingBottom());
}
}
}
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