| /* |
| * 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. |
| * |
| * <p>Modified from {@code com.android.internal.widget.ButtonBarLayout} |
| */ |
| public class ButtonBarLayout extends LinearLayout { |
| |
| private boolean stacked = false; |
| private int originalPaddingLeft; |
| private int originalPaddingRight; |
| |
| 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 (this.stacked == stacked) { |
| return; |
| } |
| this.stacked = 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. |
| originalPaddingLeft = getPaddingLeft(); |
| originalPaddingRight = getPaddingRight(); |
| int paddingHorizontal = Math.max(originalPaddingLeft, originalPaddingRight); |
| setPadding(paddingHorizontal, getPaddingTop(), paddingHorizontal, getPaddingBottom()); |
| } else { |
| setPadding(originalPaddingLeft, getPaddingTop(), originalPaddingRight, getPaddingBottom()); |
| } |
| } |
| } |