添加设置单元格最大宽度，并自动换行

[zhongjuncoder]

查看源码得知测量单元格的宽高是由IDrawFormat来进行的，因此实现该接口修改就行了。 ` class MaxColumnWidthDrawFormat<T>(private val limitWidth: Boolean, private val maxWidth: Int) : IDrawFormat<T> {

private val valueMap: MutableMap<String, SoftReference<Array<String>>> //避免产生大量对象

init {
    valueMap = HashMap()
}

override fun measureWidth(column: Column<T>, position: Int, config: TableConfig): Int {
    val paint = config.paint
    config.contentStyle.fillPaint(paint)

    val value = column.format(position)
    var width = paint.measureText(value).toInt()
    val maxWidth = maxWidth + config.getHorizontalPadding() * 2

    if (limitWidth && width > maxWidth && value.length > 1) {
        val stringBuilder = StringBuilder(value)
        var start = 0
        var end = 0
        while (end < stringBuilder.length) {
            //由于需要测量value.length那么多次，如果字符串很长耗时也会很长的
            width = paint.measureText(stringBuilder, start, end).toInt()
            if (width > maxWidth) {
                stringBuilder.insert(end - 1, "\n")
                start = end
            }
            end++
        }
        if (valueMap[value] == null) {
            valueMap[value] = SoftReference(stringBuilder.toString().split("\n").toTypedArray())
        }
        return maxWidth
    } else if (valueMap[value] == null) {
        valueMap[value] = SoftReference(value.split("\n").toTypedArray())
    }
    return width
}

override fun measureHeight(column: Column<T>, position: Int, config: TableConfig): Int {
    val paint = config.paint
    config.contentStyle.fillPaint(paint)
    return DrawUtils.getMultiTextHeight(paint, getSplitString(column.format(position)))
}

override fun draw(c: Canvas, rect: Rect, cellInfo: CellInfo<T>, config: TableConfig) {
    val paint = config.paint
    setTextPaint(config, cellInfo, paint)
    if (cellInfo.column.textAlign != null) {
        paint.textAlign = cellInfo.column.textAlign
    }
    drawText(c, cellInfo.value, rect, paint)
}

private fun drawText(c: Canvas, value: String, rect: Rect, paint: Paint) {
    DrawUtils.drawMultiText(c, paint, rect, getSplitString(value))
}

private fun setTextPaint(config: TableConfig, cellInfo: CellInfo<T>, paint: Paint) {
    config.contentStyle.fillPaint(paint)
    val backgroundFormat = config.contentCellBackgroundFormat
    if (backgroundFormat != null && backgroundFormat.getTextColor(cellInfo) != TableConfig.INVALID_COLOR) {
        paint.color = backgroundFormat.getTextColor(cellInfo)
    }
    paint.textSize = paint.textSize * config.zoom
}

private fun getSplitString(`val`: String): Array<String> {
    var values: Array<String>? = null
    if (valueMap[`val`] != null) {
        values = valueMap[`val`]!!.get()
    }
    if (values == null) {
        values = `val`.split("\n").toTypedArray()
        valueMap[`val`] = SoftReference(values)
    }
    return values
}

}`

创建TableData的时候使用的是FormTableData的方法，但是该类的createTableData方法并没有开放访问权限，所以我们自己实现一个FormTableData，并把MaxColumnWidthDrawFormat设置进去就行。

`public class MyFormTableData<T extends IForm> extends ArrayTableData<T> {

/**
 * 二维数组的构造方法
 *
 * @param tableName 表名
 * @param t         数据
 * @param columns   列
 */
protected MyFormTableData(String tableName, List<T> t, List<Column<T>> columns) {
    super(tableName, t, columns);
}

public static <T extends IForm> MyFormTableData<T> create(SmartTable table,
                                                          String tableName,
                                                          int spanSize,
                                                          T[][] data,
                                                          IDrawFormat<T> drawFormat) {
    T[][] newArray = (T[][]) Array.newInstance(data.getClass().getComponentType(), data.length);
    int[][] exitArray = new int[data.length][spanSize];
    List<CellRange> cellRanges = new ArrayList<>();
    for (int i = 0; i < data.length; i++) {
        T[] rowData = data[i];
        int spanWidthSize = 0;
        for (int j = 0; j < rowData.length; j++) {
            T t = rowData[j];
            createArrayRow(spanSize, newArray, i, rowData);
            while (exitArray[i][spanWidthSize] == 1) {
                spanWidthSize++;
            }
            newArray[i][spanWidthSize] = t;
            if (t.getSpanHeightSize() > 1) {
                for (int row = i; row < i + t.getSpanHeightSize(); row++) { //行
                    for (int col = spanWidthSize; col < spanWidthSize + t.getSpanWidthSize(); col++) { //列
                        exitArray[row][col] = 1;
                    }
                }
            }
            if (t.getSpanWidthSize() > 1 || t.getSpanHeightSize() > 1) {
                cellRanges.add(new CellRange(i, i + t.getSpanHeightSize() - 1,
                        spanWidthSize, spanWidthSize + t.getSpanWidthSize() - 1));
            }
            spanWidthSize += t.getSpanWidthSize();
        }
    }
    newArray = ArrayTableData.transformColumnArray(newArray);
    MyFormTableData tableData = createTableData(table, tableName, newArray, drawFormat);
    tableData.setUserCellRange(cellRanges);
    return tableData;
}


private static <T extends IForm> void createArrayRow(int spanSize, T[][] newArray, int i, T[] rowData) {
    if (newArray[i] == null) {
        newArray[i] = (T[]) Array.newInstance(rowData.getClass().getComponentType(), spanSize);
    }
}


private static <T extends IForm> MyFormTableData<T> createTableData(SmartTable table, String tableName, T[][] data, IDrawFormat<T> drawFormat) {
    table.getConfig().setShowColumnTitle(false);
    List<Column<T>> columns = new ArrayList<>();
    for (T[] dataArray : data) {
        Column<T> column = new Column<>("", null, drawFormat);
        column.setDatas(Arrays.asList(dataArray));
        columns.add(column);
    }
    ArrayList<T> arrayList = new ArrayList<>(Arrays.asList(data[0]));
    MyFormTableData<T> tableData = new MyFormTableData<>(tableName, arrayList, columns);
    tableData.setData(data);
    return tableData;
}

}`

最后生成表格数据的时候调用自己的类： val tableData = MyFormTableData.create(table, "", forms[0].size, forms,MaxColumnWidthDrawFormat<Form>(limitWidth, viewWith / 2))

[AiFocus]

good