Android Open Source - android-tools Flow Layout

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License

The source code is released under:
MIT License
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Java Source Code

package net.comfreeze.lib.views;
//from w  w w . jav  a 2  s  .c o m
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

public class FlowLayout extends ViewGroup {
    private int lineHeight;
    private LayoutParams reflowLayoutParams;

    public static class LayoutParams extends ViewGroup.LayoutParams {
        public final int horizontalSpacing;
        public final int verticalSpacing;

        public LayoutParams(int horizontalSpacing, int verticalSpacing) {
            super(0, 0);
            this.horizontalSpacing = horizontalSpacing;
            this.verticalSpacing = verticalSpacing;
        }

        public LayoutParams(Context context, AttributeSet attrs) {
            super(context, attrs);
            horizontalSpacing = 0;
            verticalSpacing = 0;
        }
    }

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

    public FlowLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        reflowLayoutParams = (LayoutParams) generateDefaultLayoutParams();
    }

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

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int count = getChildCount();
        final int width = r - 1;
        int xpos = getPaddingLeft();
        int ypos = getPaddingTop();

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                final int childw = child.getMeasuredWidth();
                final int childh = child.getMeasuredHeight();
//        final LayoutParams params = (LayoutParams) child.getLayoutParams();
                if (xpos + childw > width) {
                    xpos = getPaddingLeft();
                    ypos += lineHeight;
                }
                child.layout(xpos, ypos, xpos + childw, ypos + childh);
                xpos += childw + reflowLayoutParams.horizontalSpacing;
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        assert (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED);

        final int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
        int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
        final int count = getChildCount();
        int lineHeight = 0;

        int xpos = getPaddingLeft();
        int ypos = getPaddingTop();

        int childHeightMeasureSpec;
        if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
        } else {
            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        }

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
//        final LayoutParams params = (LayoutParams) child.getLayoutParams();
                child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), childHeightMeasureSpec);
                final int childw = child.getMeasuredWidth();
                lineHeight = Math.max(lineHeight, child.getMeasuredHeight() + reflowLayoutParams.verticalSpacing);

                if (xpos + childw > width) {
                    xpos = getPaddingLeft();
                    ypos += lineHeight;
                }

                xpos += childw + reflowLayoutParams.horizontalSpacing;
            }
        }

        this.lineHeight = lineHeight;

        if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
            height = ypos + lineHeight;
        } else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
            if (ypos + lineHeight < height) {
                height = ypos + lineHeight;
            }
        }

        setMeasuredDimension(width, height);
    }

    @Override
    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(1, 1);
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams params) {
        return (params instanceof LayoutParams);
    }
}
Java Source Code List
