112 lines
3.8 KiB
Java
112 lines
3.8 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. 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 distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package android.windowanimationjank;
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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.view.ViewGroup;
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/**
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* Custom layout that place all elements in flows with and automatically wraps them.
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*/
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public class FlowLayout extends ViewGroup {
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private int mLineHeight;
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public FlowLayout(Context context) {
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super(context);
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}
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public FlowLayout(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 width =
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MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() -getPaddingRight();
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int height =
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MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
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final int count = getChildCount();
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int x = getPaddingLeft();
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int y = getPaddingTop();
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int lineHeight = 0;
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int childHeightMeasureSpec;
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if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
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childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
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} else {
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childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
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}
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for (int i = 0; i < count; i++) {
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final View child = getChildAt(i);
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if (child.getVisibility() != GONE) {
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child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST),
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childHeightMeasureSpec);
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final int childWidth = child.getMeasuredWidth();
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lineHeight = Math.max(lineHeight, child.getMeasuredHeight());
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if (x + childWidth > width) {
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x = getPaddingLeft();
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y += lineHeight;
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}
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x += childWidth;
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}
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}
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mLineHeight = lineHeight;
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if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
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height = y + lineHeight;
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} else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
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if (y + lineHeight < height) {
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height = y + lineHeight;
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}
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}
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setMeasuredDimension(width, height);
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}
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@Override
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protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
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if (p instanceof LayoutParams) {
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return true;
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}
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return false;
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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final int count = getChildCount();
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final int width = r - l;
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int x = getPaddingLeft();
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int y = getPaddingTop();
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for (int i = 0; i < count; i++) {
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final View child = getChildAt(i);
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if (child.getVisibility() != GONE) {
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final int childWidth = child.getMeasuredWidth();
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final int childHeight = child.getMeasuredHeight();
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if (x + childWidth > width) {
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x = getPaddingLeft();
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y += mLineHeight;
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}
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child.layout(x, y, x + childWidth, y + childHeight);
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x += childWidth;
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}
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}
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}
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}
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