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NativeScript layouts implemented in Java
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hshristov
236
src/org/nativescript/widgets/WrapLayout.java
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236
src/org/nativescript/widgets/WrapLayout.java
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/**
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*
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*/
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package org.nativescript.widgets;
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import java.util.ArrayList;
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import android.content.Context;
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import android.view.View;
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/**
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* @author hhristov
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*
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*/
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public class WrapLayout extends LayoutBase {
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private int _itemWidth = -1;
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private int _itemHeight = -1;
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private Orientation _orientation = Orientation.horzontal;
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private ArrayList<Integer> _lenghts = new ArrayList<Integer>();
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public WrapLayout(Context context) {
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super(context);
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}
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public Orientation getOrientation() {
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return this._orientation;
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}
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public void setOrientation(Orientation value) {
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this._orientation = value;
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this.requestLayout();
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}
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public int getItemWidth() {
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return this._itemWidth;
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}
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public void setItemWidth(int value) {
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this._itemWidth = value;
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this.requestLayout();
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}
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public int getItemHeight() {
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return this._itemHeight;
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}
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public void setItemHeight(int value) {
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this._itemHeight = value;
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this.requestLayout();
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}
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private static int getViewMeasureSpec(int parentMode, int parentLength, int itemLength) {
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if (itemLength > 0) {
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return MeasureSpec.makeMeasureSpec(itemLength, MeasureSpec.EXACTLY);
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}
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else if (parentMode == MeasureSpec.UNSPECIFIED) {
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return MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
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}
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else {
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return MeasureSpec.makeMeasureSpec(parentLength, MeasureSpec.AT_MOST);
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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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int measureWidth = 0;
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int measureHeight = 0;
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int width = MeasureSpec.getSize(widthMeasureSpec);
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int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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int height = MeasureSpec.getSize(heightMeasureSpec);
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int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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boolean isVertical = this._orientation == Orientation.vertical;
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int verticalPadding = this.getPaddingTop() + this.getPaddingBottom();
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int horizontalPadding = this.getPaddingLeft() + this.getPaddingRight();
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int childWidthMeasureSpec = getViewMeasureSpec(widthMode, width, this._itemWidth);
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int childHeightMeasureSpec = getViewMeasureSpec(heightMode, height, this._itemHeight);
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int remainingWidth = widthMode == MeasureSpec.UNSPECIFIED ? Integer.MAX_VALUE : width - horizontalPadding;
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int remainingHeight = heightMode == MeasureSpec.UNSPECIFIED ? Integer.MAX_VALUE : height - verticalPadding;
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int count = this.getChildCount();
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this._lenghts.clear();
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int rowOrColumn = 0;
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int maxLenght = 0;
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for (int i = 0; i < count; i++) {
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View child = this.getChildAt(i);
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if (child.getVisibility() == View.GONE) {
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continue;
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}
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CommonLayoutParams.measureChild(child, childWidthMeasureSpec, childHeightMeasureSpec);
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final int childMeasuredWidth = CommonLayoutParams.getDesiredWidth(child);
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final int childMeasuredHeight = CommonLayoutParams.getDesiredHeight(child);
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if (isVertical) {
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if (childMeasuredHeight > remainingHeight) {
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rowOrColumn++;
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maxLenght = Math.max(maxLenght, measureHeight);
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measureHeight = childMeasuredHeight;
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remainingWidth = height - childMeasuredHeight;
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this._lenghts.add(rowOrColumn, childMeasuredWidth);
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}
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else {
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remainingHeight -= childMeasuredHeight;
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measureHeight += childMeasuredHeight;
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}
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}
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else {
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if (childMeasuredWidth > remainingWidth) {
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rowOrColumn++;
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maxLenght = Math.max(maxLenght, measureWidth);
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measureWidth = childMeasuredWidth;
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remainingWidth = width - childMeasuredWidth;
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this._lenghts.add(rowOrColumn, childMeasuredHeight);
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}
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else {
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remainingWidth -= childMeasuredWidth;
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measureWidth += childMeasuredWidth;
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}
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}
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if(this._lenghts.size() <= rowOrColumn) {
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this._lenghts.add(rowOrColumn, isVertical ? childMeasuredWidth : childMeasuredHeight);
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}
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else {
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this._lenghts.set(rowOrColumn, Math.max(this._lenghts.get(rowOrColumn), isVertical ? childMeasuredWidth : childMeasuredHeight));
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}
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}
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count = this._lenghts.size();
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if (isVertical) {
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measureHeight = Math.max(maxLenght, measureHeight);
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for (int i = 0; i < count; i++) {
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measureWidth += this._lenghts.get(i);
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}
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}
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else {
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measureWidth = Math.max(maxLenght, measureWidth);
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for (int i = 0; i < count; i++) {
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measureHeight += this._lenghts.get(i);
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}
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}
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// Add in our padding
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measureWidth += horizontalPadding;
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measureHeight += verticalPadding;
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// Check against our minimum sizes
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measureWidth = Math.max(measureWidth, this.getSuggestedMinimumWidth());
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measureHeight = Math.max(measureHeight, this.getSuggestedMinimumHeight());
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int widthSizeAndState = resolveSizeAndState(measureWidth, widthMeasureSpec, 0);
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int heightSizeAndState = resolveSizeAndState(measureHeight, heightMeasureSpec, 0);
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this.setMeasuredDimension(widthSizeAndState, heightSizeAndState);
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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boolean isVertical = this._orientation == Orientation.vertical;
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int paddingLeft = this.getPaddingLeft();
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int paddingRight = this.getPaddingRight();
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int paddingTop = this.getPaddingTop();
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int paddingBottom = this.getPaddingBottom();
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int childLeft = paddingLeft;
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int childTop = paddingTop;
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int childrenLength = isVertical ? bottom - top - (paddingRight + paddingBottom) : right - left - (paddingLeft + paddingRight);
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int rowOrColumn = 0;
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int count = this.getChildCount();
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for (int i = 0; i < count; i++) {
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View child = this.getChildAt(i);
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if (child.getVisibility() == View.GONE) {
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continue;
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}
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// Add margins because layoutChild will subtract them.
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int childWidth = CommonLayoutParams.getDesiredWidth(child);
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int childHeight = CommonLayoutParams.getDesiredHeight(child);
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int length = this._lenghts.get(rowOrColumn);
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if (isVertical) {
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childWidth = length;
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childHeight = this._itemHeight > 0 ? this._itemHeight : childHeight;
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if (childTop + childHeight > childrenLength) {
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// Move to top.
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childTop = paddingTop;
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// Move to right with current column width.
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childLeft += length;
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// Move to next column.
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rowOrColumn++;
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// Take current column width.
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childWidth = length = this._lenghts.get(rowOrColumn);
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}
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}
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else {
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childWidth = this._itemWidth > 0 ? this._itemWidth : childWidth;
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childHeight = length;
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if (childLeft + childWidth > childrenLength) {
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// Move to left.
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childLeft = paddingLeft;
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// Move to bottom with current row height.
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childTop += length;
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// Move to next column.
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rowOrColumn++;
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// Take current row height.
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childHeight = length = this._lenghts.get(rowOrColumn);
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}
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}
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CommonLayoutParams.layoutChild(child, childLeft, childTop, childLeft + childWidth, childTop + childHeight);
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if (isVertical) {
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// Move next child Top position to bottom.
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childTop += childHeight;
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}
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else {
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// Move next child Left position to right.
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childLeft += childWidth;
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}
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}
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}
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}
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