106 lines
4.3 KiB
Java
106 lines
4.3 KiB
Java
/* Copyright 2017 Andrew Dawson
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky;
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import android.content.Context;
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import android.content.res.TypedArray;
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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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public class FlowLayout extends ViewGroup {
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private int paddingHorizontal; // internal padding between child views
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private int paddingVertical; //
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private int totalHeight;
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public FlowLayout(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray a = context.getTheme().obtainStyledAttributes(
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attrs, R.styleable.FlowLayout, 0, 0);
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try {
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paddingHorizontal = a.getDimensionPixelSize(
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R.styleable.FlowLayout_paddingHorizontal, 0);
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paddingVertical = a.getDimensionPixelSize(R.styleable.FlowLayout_paddingVertical, 0);
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} finally {
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a.recycle();
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}
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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Assert.expect(MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED);
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int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
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int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
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int count = getChildCount();
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int x = getPaddingLeft();
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int y = getPaddingTop();
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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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totalHeight = 0;
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for (int i = 0; i < count; i++) {
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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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int childwidth = child.getMeasuredWidth();
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totalHeight = Math.max(totalHeight, child.getMeasuredHeight() + paddingVertical);
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if (x + childwidth > width) {
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x = getPaddingLeft();
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y += totalHeight;
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}
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x += childwidth + paddingHorizontal;
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}
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}
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if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
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height = y + totalHeight;
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} else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
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if (y + totalHeight < height) {
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height = y + totalHeight;
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}
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}
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height += 5; // Fudge to avoid clipping bottom of last row.
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setMeasuredDimension(width, height);
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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 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 < getChildCount(); i++) {
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View child = getChildAt(i);
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if (child.getVisibility() != GONE) {
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int childWidth = child.getMeasuredWidth();
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int childHeight = child.getMeasuredHeight();
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if (x + childWidth > width) {
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x = getPaddingLeft();
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y += totalHeight;
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}
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child.layout(x, y, x + childWidth, y + childHeight);
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x += childWidth + paddingHorizontal;
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}
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}
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}
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}
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