package com.lean56.andplug.view;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import com.lean56.andplug.R;
import java.util.ArrayList;
import java.util.List;
/**
* FlowLayout will arrange child elements horizontally one next to another. If there is not enough
* space for next view new line will be added.
* see {https://github.com/blazsolar/FlowLayout/}
*
* @author Blaz Solar
* @author Charles
*/
public class FlowLayout extends ViewGroup {
private int mGravity = (isIcs() ? Gravity.START : Gravity.START) | Gravity.TOP;
private final List<List<View>> mLines = new ArrayList<List<View>>();
private final List<Integer> mLineHeights = new ArrayList<Integer>();
private final List<Integer> mLineMargins = new ArrayList<Integer>();
public FlowLayout(Context context) {
this(context, null);
}
public FlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout, defStyle, 0);
try {
int index = a.getInt(R.styleable.FlowLayout_android_gravity, -1);
if(index > 0) {
setGravity(index);
}
} finally {
a.recycle();
}
}
/**
* {@inheritDoc}
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
int width = 0;
int height = getPaddingTop() + getPaddingBottom();
int lineWidth = 0;
int lineHeight = 0;
int childCount = getChildCount();
for(int i = 0; i < childCount; i++) {
View child = getChildAt(i);
boolean lastChild = i == childCount - 1;
if(child.getVisibility() == View.GONE) {
if(lastChild) {
width = Math.max(width, lineWidth);
height += lineHeight;
}
continue;
}
measureChildWithMargins(child, widthMeasureSpec, lineWidth, heightMeasureSpec, height);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
int childWidthMode = MeasureSpec.AT_MOST;
int childWidthSize = sizeWidth;
int childHeightMode = MeasureSpec.AT_MOST;
int childHeightSize = sizeHeight;
if(lp.width == LayoutParams.MATCH_PARENT) {
childWidthMode = MeasureSpec.EXACTLY ;
childWidthSize -= lp.leftMargin + lp.rightMargin;
} else if(lp.width >= 0) {
childWidthMode = MeasureSpec.EXACTLY;
childWidthSize = lp.width;
}
if(lp.height >= 0) {
childHeightMode = MeasureSpec.EXACTLY;
childHeightSize = lp.height;
} else if (modeHeight == MeasureSpec.UNSPECIFIED) {
childHeightMode = MeasureSpec.UNSPECIFIED;
childHeightSize = 0;
}
child.measure(MeasureSpec.makeMeasureSpec(childWidthSize, childWidthMode), MeasureSpec.makeMeasureSpec(childHeightSize, childHeightMode));
int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
if(lineWidth + childWidth > sizeWidth) {
width = Math.max(width, lineWidth);
lineWidth = childWidth;
height += lineHeight;
lineHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
} else {
lineWidth += childWidth;
lineHeight = Math.max(lineHeight, child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin);
}
if(lastChild) {
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
width += getPaddingLeft() + getPaddingRight();
setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth : width, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight : height);
}
/**
* {@inheritDoc}
*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mLines.clear();
mLineHeights.clear();
mLineMargins.clear();
int width = getWidth();
int height = getHeight();
int linesSum = getPaddingTop();
int lineWidth = 0;
int lineHeight = 0;
List<View> lineViews = new ArrayList<View>();
float horizontalGravityFactor;
switch ((mGravity & Gravity.HORIZONTAL_GRAVITY_MASK)) {
case Gravity.START:
default:
horizontalGravityFactor = 0;
break;
case Gravity.CENTER_HORIZONTAL:
horizontalGravityFactor = .5f;
break;
case Gravity.END:
horizontalGravityFactor = 1;
break;
}
for(int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
if(child.getVisibility() == View.GONE) {
continue;
}
LayoutParams lp = (LayoutParams) child.getLayoutParams();
int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
int childHeight = child.getMeasuredHeight() + lp.bottomMargin + lp.topMargin;
if(lineWidth + childWidth > width) {
mLineHeights.add(lineHeight);
mLines.add(lineViews);
mLineMargins.add((int) ((width - lineWidth) * horizontalGravityFactor) + getPaddingLeft());
linesSum += lineHeight;
lineHeight = 0;
lineWidth = 0;
lineViews = new ArrayList<View>();
}
lineWidth += childWidth;
lineHeight = Math.max(lineHeight, childHeight);
lineViews.add(child);
}
mLineHeights.add(lineHeight);
mLines.add(lineViews);
mLineMargins.add((int) ((width - lineWidth) * horizontalGravityFactor) + getPaddingLeft());
linesSum += lineHeight;
int verticalGravityMargin = 0;
switch ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) ) {
case Gravity.TOP:
default:
break;
case Gravity.CENTER_VERTICAL:
verticalGravityMargin = (height - linesSum) / 2;
break;
case Gravity.BOTTOM:
verticalGravityMargin = height - linesSum;
break;
}
int numLines = mLines.size();
int left;
int top = getPaddingTop();
for(int i = 0; i < numLines; i++) {
lineHeight = mLineHeights.get(i);
lineViews = mLines.get(i);
left = mLineMargins.get(i);
int children = lineViews.size();
for(int j = 0; j < children; j++) {
View child = lineViews.get(j);
if(child.getVisibility() == View.GONE) {
continue;
}
LayoutParams lp = (LayoutParams) child.getLayoutParams();
// if height is match_parent we need to remeasure child to line height
if(lp.height == LayoutParams.MATCH_PARENT) {
int childWidthMode = MeasureSpec.AT_MOST;
int childWidthSize = lineWidth;
if(lp.width == LayoutParams.MATCH_PARENT) {
childWidthMode = MeasureSpec.EXACTLY;
} else if(lp.width >= 0) {
childWidthMode = MeasureSpec.EXACTLY;
childWidthSize = lp.width;
}
child.measure(MeasureSpec.makeMeasureSpec(childWidthSize, childWidthMode), MeasureSpec.makeMeasureSpec(lineHeight - lp.topMargin - lp.bottomMargin, MeasureSpec.EXACTLY));
}
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
int gravityMargin = 0;
if(Gravity.isVertical(lp.gravity)) {
switch (lp.gravity) {
case Gravity.TOP:
default:
break;
case Gravity.CENTER_VERTICAL:
case Gravity.CENTER:
gravityMargin = (lineHeight - childHeight - lp.topMargin - lp.bottomMargin) / 2 ;
break;
case Gravity.BOTTOM:
gravityMargin = lineHeight - childHeight - lp.topMargin - lp.bottomMargin;
break;
}
}
child.layout(left + lp.leftMargin,
top + lp.topMargin + gravityMargin + verticalGravityMargin,
left + childWidth + lp.leftMargin,
top + childHeight + lp.topMargin + gravityMargin + verticalGravityMargin);
left += childWidth + lp.leftMargin + lp.rightMargin;
}
top += lineHeight;
}
}
@Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
/**
* {@inheritDoc}
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
/**
* {@inheritDoc}
*/
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
}
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public void setGravity(int gravity) {
if(mGravity != gravity) {
if((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
gravity |= isIcs() ? Gravity.START : Gravity.LEFT;
}
if((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
gravity |= Gravity.TOP;
}
mGravity = gravity;
requestLayout();
}
}
public int getGravity() {
return mGravity;
}
/**
* @return <code>true</code> if device is running ICS or grater version of Android.
*/
private static boolean isIcs() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH;
}
public static class LayoutParams extends MarginLayoutParams {
public int gravity = -1;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.FlowLayout_Layout);
try {
gravity = a.getInt(R.styleable.FlowLayout_Layout_android_layout_gravity, -1);
} finally {
a.recycle();
}
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
}
}
}