Android Open Source - hubroid Flow Layout

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License

The source code is released under:

Copyright (c) 2011 Eddie Ringle. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistribution...

Java Source Code

/*
 * Copyright (c) 2012 Eddie Ringle/*from  w ww  .  ja v  a2  s. com*/
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 * and the following disclaimer in the documentation and/or other materials provided with the
 * distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.idlesoft.android.apps.github.ui.widgets;

import net.idlesoft.android.apps.github.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

public class FlowLayout extends ViewGroup {

    private int mHorizontalSpacing;

    private int mVerticalSpacing;

    public FlowLayout(Context context) {
        super(context);
    }

    public FlowLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout);
        try {
            mHorizontalSpacing = a
                    .getDimensionPixelSize(R.styleable.FlowLayout_horizontalSpacing, 0);
            mVerticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_verticalSpacing, 0);
        } finally {
            a.recycle();
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);

        int width = 0;
        int height = getPaddingTop();

        int currentWidth = getPaddingLeft();
        int currentHeight = 0;

        boolean breakLine = false;

        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            LayoutParams lp = (LayoutParams) child.getLayoutParams();
            measureChild(child, widthMeasureSpec, heightMeasureSpec);

            if (breakLine || currentWidth + child.getMeasuredWidth() > widthSize) {
                height += currentHeight + mVerticalSpacing;
                currentHeight = 0;
                if (currentWidth > width) {
                    width = currentWidth;
                }
                currentWidth = getPaddingLeft();
            }

            int spacing = mHorizontalSpacing;
            if (lp.spacing > -1) {
                spacing = lp.spacing;
            }

            lp.x = currentWidth;
            lp.y = height;

            currentWidth += child.getMeasuredWidth() + spacing;
            int childHeight = child.getMeasuredHeight();
            if (childHeight > currentHeight) {
                currentHeight = childHeight;
            }

            breakLine = lp.breakLine;
        }

        height += currentHeight;
        if (currentWidth > width) {
            width = currentWidth;
        }

        width += getPaddingRight();
        height += getPaddingBottom();

        setMeasuredDimension(resolveSize(width, widthMeasureSpec),
                resolveSize(height, heightMeasureSpec));
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            LayoutParams lp = (LayoutParams) child.getLayoutParams();
            child.layout(lp.x, lp.y, lp.x + child.getMeasuredWidth(),
                    lp.y + child.getMeasuredHeight());
        }
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return p instanceof LayoutParams;
    }

    @Override
    protected LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
    }

    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new LayoutParams(getContext(), attrs);
    }

    @Override
    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
        return new LayoutParams(p.width, p.height);
    }

    public static class LayoutParams extends ViewGroup.LayoutParams {

        public boolean breakLine = false;

        public int spacing = -1;

        private int x;

        private int y;

        public LayoutParams(Context context, AttributeSet attrs) {
            super(context, attrs);

            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout);
            try {
                spacing = a
                        .getDimensionPixelSize(R.styleable.FlowLayout_LayoutParams_layout_spacing,
                                -1);
                breakLine = a.getBoolean(R.styleable.FlowLayout_LayoutParams_breakLine, false);
            } finally {
                a.recycle();
            }
        }

        public LayoutParams(int width, int height) {
            super(width, height);
        }
    }
}

Java Source Code List

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