Package com.vaadin.client.widget.escalator

Interface ColumnConfiguration

public interface ColumnConfiguration

A representation of the columns in an instance of Escalator.

Since:

7.4

Author:

Vaadin Ltd

See Also:

Escalator.getColumnConfiguration()

Method Summary

Modifier and Type	Method	Description
int	getColumnCount()	Returns the number of columns in the escalator.
double	getColumnWidth(int index)	Returns the user-defined width of a column.
double	getColumnWidthActual(int index)	Returns the actual width of a column.
int	getFrozenColumnCount()	Get the number of leftmost columns that are not affected by horizontal scrolling.
void	insertColumns(int index, int numberOfColumns)	Adds columns at a certain index.
void	refreshColumns(int index, int numberOfColumns)	Refreshes a range of rows in the current row containers in each Escalator section.
void	removeColumns(int index, int numberOfColumns)	Removes columns at certain indices.
void	setColumnWidth(int index, double px)	Sets (or unsets) an explicit width for a column.
void	setColumnWidths(Map<Integer,Double> indexWidthMap)	Sets widths for a set of columns.
void	setFrozenColumnCount(int count)	Sets the number of leftmost columns that are not affected by horizontal scrolling.

Method Detail

removeColumns

void removeColumns(int index,
                   int numberOfColumns)
            throws IndexOutOfBoundsException,
                   IllegalArgumentException

Removes columns at certain indices.

If any of the removed columns were frozen, the number of frozen columns will be reduced by the number of the removed columns that were frozen.

Note: This method simply removes the given columns, and does not do much of anything else. Especially if you have column spans, you probably need to run refreshColumns(int, int) or RowContainer.refreshRows(int, int)

Parameters:

index - the index of the first column to be removed

numberOfColumns - the number of rows to remove, starting from index

Throws:

IndexOutOfBoundsException - if the entire range of removed columns is not currently present in the escalator

IllegalArgumentException - if numberOfColumns is less than 1.

insertColumns

void insertColumns(int index,
                   int numberOfColumns)
            throws IndexOutOfBoundsException,
                   IllegalArgumentException

Adds columns at a certain index.

The new columns will be inserted between the column at the index, and the column before (an index of 0 means that the columns are inserted at the beginning). Therefore, the columns at the index and afterwards will be moved to the right.

The contents of the inserted columns will be queried from the respective cell renderers in the header, body and footer.

If there are frozen columns and the first added column is to the left of the last frozen column, the number of frozen columns will be increased by the number of inserted columns.

Note: Only the contents of the inserted columns will be rendered. If inserting new columns affects the contents of existing columns (e.g. you have column spans), RowContainer.refreshRows(int, int) or refreshColumns(int, int) needs to be called as appropriate.

Parameters:

index - the index of the column before which new columns are inserted, or getColumnCount() to add new columns at the end

numberOfColumns - the number of columns to insert after the index

Throws:

IndexOutOfBoundsException - if index is not an integer in the range [0..getColumnCount()]

IllegalArgumentException - if numberOfColumns is less than 1.

getColumnCount

int getColumnCount()

Returns the number of columns in the escalator.

Returns:

the number of columns in the escalator

setFrozenColumnCount

void setFrozenColumnCount(int count)
                   throws IllegalArgumentException

Sets the number of leftmost columns that are not affected by horizontal scrolling.

Parameters:

count - the number of columns to freeze

Throws:

IllegalArgumentException - if the column count is < 0 or > the number of columns

getFrozenColumnCount

int getFrozenColumnCount()

Get the number of leftmost columns that are not affected by horizontal scrolling.

Returns:

the number of frozen columns

setColumnWidth

void setColumnWidth(int index,
                    double px)
             throws IllegalArgumentException

Sets (or unsets) an explicit width for a column.

Parameters:

index - the index of the column for which to set a width

px - the number of pixels the indicated column should be, or a negative number to let the escalator decide

Throws:

IllegalArgumentException - if index is not a valid column index

getColumnWidth

double getColumnWidth(int index)
               throws IllegalArgumentException

Returns the user-defined width of a column.

Parameters:

index - the index of the column for which to retrieve the width

Returns:

the column's width in pixels, or a negative number if the width is implicitly decided by the escalator

Throws:

IllegalArgumentException - if index is not a valid column index

setColumnWidths

void setColumnWidths(Map<Integer,Double> indexWidthMap)
              throws IllegalArgumentException

Sets widths for a set of columns.

Parameters:

indexWidthMap - a map from column index to its respective width to be set. If the given width for a column index is negative, the column is resized-to-fit.

Throws:

IllegalArgumentException - if indexWidthMap is null

IllegalArgumentException - if any column index in indexWidthMap is invalid

NullPointerException - If any value in the map is null

getColumnWidthActual

double getColumnWidthActual(int index)
                     throws IllegalArgumentException

Returns the actual width of a column.

Parameters:

index - the index of the column for which to retrieve the width

Returns:

the column's actual width in pixels

Throws:

IllegalArgumentException - if index is not a valid column index

refreshColumns

void refreshColumns(int index,
                    int numberOfColumns)
             throws IndexOutOfBoundsException,
                    IllegalArgumentException

Refreshes a range of rows in the current row containers in each Escalator section.

The data for the refreshed columns is queried from the current cell renderer.

Parameters:

index - the index of the first row that will be updated

numberOfRows - the number of rows to update, starting from the index

Throws:

IndexOutOfBoundsException - if any integer number in the range [index..(index+numberOfColumns)] is not an existing column index.

IllegalArgumentException - if numberOfColumns is less than 1.

See Also:

RowContainer.setEscalatorUpdater(EscalatorUpdater), Escalator.getHeader(), Escalator.getBody(), Escalator.getFooter()