Package com.vaadin.ui

Class GridLayout

    • Constructor Detail

      • GridLayout

        public GridLayout​(int columns,
                  int rows)
        Constructor for a grid of given size (number of columns and rows). The grid may grow or shrink later. Grid grows automatically if you add components outside its area.
        Parameters:
        columns - Number of columns in the grid.
        rows - Number of rows in the grid.

      • GridLayout

        public GridLayout()
        Constructs an empty (1x1) grid layout that is extended as needed.

      • GridLayout

        public GridLayout​(int columns,
                  int rows,
                  Component... children)
        Constructs a GridLayout of given size (number of columns and rows) and adds the given components in order to the grid.
        Parameters:
        columns - Number of columns in the grid.
        rows - Number of rows in the grid.
        children - Components to add to the grid.
        See Also:
        AbstractComponentContainer.addComponents(Component...)

    • Method Detail

      • getState

        protected GridLayoutState getState()
        Description copied from class: AbstractComponent
        Returns the shared state bean with information to be sent from the server to the client. Subclasses should override this method and set any relevant fields of the state returned by super.getState().
        Overrides:
        getState in class AbstractLayout
        Returns:
        updated component shared state

      • addComponent

        public void addComponent​(Component component,
                         int column1,
                         int row1,
                         int column2,
                         int row2)
                  throws GridLayout.OverlapsException,
                         GridLayout.OutOfBoundsException

        Adds a component to the grid in the specified area. The area is defined by specifying the upper left corner (column1, row1) and the lower right corner (column2, row2) of the area. The coordinates are zero-based.

        If the area overlaps with any of the existing components already present in the grid, the operation will fail and an GridLayout.OverlapsException is thrown.

        Parameters:
        component - the component to be added, not null.
        column1 - the column of the upper left corner of the area c is supposed to occupy. The leftmost column has index 0.
        row1 - the row of the upper left corner of the area c is supposed to occupy. The topmost row has index 0.
        column2 - the column of the lower right corner of the area c is supposed to occupy.
        row2 - the row of the lower right corner of the area c is supposed to occupy.
        Throws:
        GridLayout.OverlapsException - if the new component overlaps with any of the components already in the grid.
        GridLayout.OutOfBoundsException - if the cells are outside the grid area.

      • addComponent

        public void addComponent​(Component component,
                         int column,
                         int row)
                  throws GridLayout.OverlapsException,
                         GridLayout.OutOfBoundsException
        Adds the component to the grid in cells column1,row1 (NortWest corner of the area.) End coordinates (SouthEast corner of the area) are the same as column1,row1. The coordinates are zero-based. Component width and height is 1.
        Parameters:
        component - the component to be added, not null.
        column - the column index, starting from 0.
        row - the row index, starting from 0.
        Throws:
        GridLayout.OverlapsException - if the new component overlaps with any of the components already in the grid.
        GridLayout.OutOfBoundsException - if the cell is outside the grid area.

      • newLine

        public void newLine()
        Forces the next component to be added at the beginning of the next line.

        Sets the cursor column to 0 and increments the cursor row by one.

        By calling this function you can ensure that no more components are added right of the previous component.

        See Also:
        space()

      • space

        public void space()
        Moves the cursor forward by one. If the cursor goes out of the right grid border, it is moved to the first column of the next row.
        See Also:
        newLine()

      • removeComponent

        public void removeComponent​(int column,
                            int row)
        Removes the component specified by its cell coordinates.
        Parameters:
        column - the component's column, starting from 0.
        row - the component's row, starting from 0.

      • iterator

        public Iterator<Component> iterator()
        Gets an Iterator for the components contained in the layout. By using the Iterator it is possible to step through the contents of the layout.
        Specified by:
        iterator in interface HasComponents
        Specified by:
        iterator in interface Iterable<Component>
        Returns:
        the Iterator of the components inside the layout.

      • beforeClientResponse

        public void beforeClientResponse​(boolean initial)
        Description copied from interface: ClientConnector
        Called before the shared state and RPC invocations are sent to the client. Gives the connector an opportunity to set computed/dynamic state values or to invoke last minute RPC methods depending on other component features.
        Specified by:
        beforeClientResponse in interface ClientConnector
        Overrides:
        beforeClientResponse in class AbstractComponent
        Parameters:
        initial - true if the client-side connector will be created and initialized after this method has been invoked. false if there is already an initialized client-side connector.

      • setColumns

        public void setColumns​(int columns)
        Sets the number of columns in the grid. The column count can not be reduced if there are any areas that would be outside of the shrunk grid.
        Parameters:
        columns - the new number of columns in the grid.

      • getColumns

        public int getColumns()
        Get the number of columns in the grid.
        Returns:
        the number of columns in the grid.

      • setRows

        public void setRows​(int rows)
        Sets the number of rows in the grid. The number of rows can not be reduced if there are any areas that would be outside of the shrunk grid.
        Parameters:
        rows - the new number of rows in the grid.

      • getRows

        public int getRows()
        Get the number of rows in the grid.
        Returns:
        the number of rows in the grid.

      • getCursorX

        public int getCursorX()
        Gets the current x-position (column) of the cursor.

        The cursor position points the position for the next component that is added without specifying its coordinates (grid cell). When the cursor position is occupied, the next component will be added to first free position after the cursor.

        Returns:
        the grid column the cursor is on, starting from 0.

      • setCursorX

        public void setCursorX​(int cursorX)
        Sets the current cursor x-position. This is usually handled automatically by GridLayout.
        Parameters:
        cursorX -

      • getCursorY

        public int getCursorY()
        Gets the current y-position (row) of the cursor.

        The cursor position points the position for the next component that is added without specifying its coordinates (grid cell). When the cursor position is occupied, the next component will be added to the first free position after the cursor.

        Returns:
        the grid row the Cursor is on.

      • setCursorY

        public void setCursorY​(int cursorY)
        Sets the current y-coordinate (row) of the cursor. This is usually handled automatically by GridLayout.
        Parameters:
        cursorY - the row number, starting from 0 for the topmost row.

      • replaceComponent

        public void replaceComponent​(Component oldComponent,
                             Component newComponent)
        Description copied from interface: ComponentContainer
        Replaces the component in the container with another one without changing position.

        This method replaces component with another one is such way that the new component overtakes the position of the old component. If the old component is not in the container, the new component is added to the container. If the both component are already in the container, their positions are swapped. Component attach and detach events should be taken care as with add and remove.

        Specified by:
        replaceComponent in interface ComponentContainer
        Parameters:
        oldComponent - the old component that will be replaced.
        newComponent - the new component to be replaced.

      • setComponentAlignment

        public void setComponentAlignment​(Component childComponent,
                                  Alignment alignment)
        Description copied from interface: Layout.AlignmentHandler
        Set alignment for one contained component in this layout. Use predefined alignments from Alignment class. Example: layout.setComponentAlignment(myComponent, Alignment.TOP_RIGHT);
        Specified by:
        setComponentAlignment in interface Layout.AlignmentHandler
        Parameters:
        childComponent - the component to align within it's layout cell.
        alignment - the Alignment value to be set

      • setSpacing

        public void setSpacing​(boolean spacing)
        Description copied from interface: Layout.SpacingHandler
        Enable spacing between child components within this layout.

        NOTE: This will only affect the space between components, not the space around all the components in the layout (i.e. do not confuse this with the cellspacing attribute of a HTML Table). Use #setMargin(boolean) to add space around the layout.

        See the reference manual for more information about CSS rules for defining the amount of spacing to use.

        Specified by:
        setSpacing in interface Layout.SpacingHandler
        Parameters:
        spacing - true if spacing should be turned on, false if it should be turned off

      • isSpacing

        public boolean isSpacing()
        Specified by:
        isSpacing in interface Layout.SpacingHandler
        Returns:
        true if spacing between child components within this layout is enabled, false otherwise

      • insertRow

        public void insertRow​(int row)
        Inserts an empty row at the specified position in the grid.
        Parameters:
        row - Index of the row before which the new row will be inserted. The leftmost row has index 0.

      • removeRow

        public void removeRow​(int row)
        Removes a row and all the components in the row.

        Components which span over several rows are removed if the selected row is on the first row of such a component.

        If the last row is removed then all remaining components will be removed and the grid will be reduced to one row. The cursor will be moved to the upper left cell of the grid.

        Parameters:
        row - Index of the row to remove. The leftmost row has index 0.

      • setColumnExpandRatio

        public void setColumnExpandRatio​(int columnIndex,
                                 float ratio)
        Sets the expand ratio of given column.

        The expand ratio defines how excess space is distributed among columns. Excess space means space that is left over from components that are not sized relatively. By default, the excess space is distributed evenly.

        Note, that width of this GridLayout needs to be defined (fixed or relative, as opposed to undefined height) for this method to have any effect.

        Note that checking for relative width for the child components is done on the server so you cannot set a child component to have undefined width on the server and set it to 100% in CSS. You must set it to 100% on the server.

        Parameters:
        columnIndex -
        ratio -
        See Also:
        #setWidth(float, int)

      • getColumnExpandRatio

        public float getColumnExpandRatio​(int columnIndex)
        Returns the expand ratio of given column
        Parameters:
        columnIndex -
        Returns:
        the expand ratio, 0.0f by default
        See Also:
        setColumnExpandRatio(int, float)

      • setRowExpandRatio

        public void setRowExpandRatio​(int rowIndex,
                              float ratio)
        Sets the expand ratio of given row.

        Expand ratio defines how excess space is distributed among rows. Excess space means the space left over from components that are not sized relatively. By default, the excess space is distributed evenly.

        Note, that height of this GridLayout needs to be defined (fixed or relative, as opposed to undefined height) for this method to have any effect.

        Note that checking for relative height for the child components is done on the server so you cannot set a child component to have undefined height on the server and set it to 100% in CSS. You must set it to 100% on the server.

        Parameters:
        rowIndex - The row index, starting from 0 for the topmost row.
        ratio -
        See Also:
        #setHeight(float, int)

      • getRowExpandRatio

        public float getRowExpandRatio​(int rowIndex)
        Returns the expand ratio of given row.
        Parameters:
        rowIndex - The row index, starting from 0 for the topmost row.
        Returns:
        the expand ratio, 0.0f by default
        See Also:
        setRowExpandRatio(int, float)

      • getComponent

        public Component getComponent​(int x,
                              int y)
        Gets the Component at given index.
        Parameters:
        x - The column index, starting from 0 for the leftmost column.
        y - The row index, starting from 0 for the topmost row.
        Returns:
        Component in given cell or null if empty

      • getComponentArea

        public GridLayout.Area getComponentArea​(Component component)
        Returns information about the area where given component is laid in the GridLayout.
        Parameters:
        component - the component whose area information is requested.
        Returns:
        an Area object that contains information how component is laid in the grid

      • setMargin

        public void setMargin​(boolean enabled)
        Description copied from interface: Layout.MarginHandler
        Enable layout margins. Affects all four sides of the layout. This will tell the client-side implementation to leave extra space around the layout. The client-side implementation decides the actual amount, and it can vary between themes.
        Specified by:
        setMargin in interface Layout.MarginHandler
        Parameters:
        enabled - true if margins should be enabled on all sides, false to disable all margins

      • setMargin

        public void setMargin​(MarginInfo marginInfo)
        Description copied from interface: Layout.MarginHandler
        Enable margins for this layout.

        NOTE: This will only affect the space around the components in the layout, not space between the components in the layout. Use #setSpacing(boolean) to add space between the components in the layout.

        See the reference manual for more information about CSS rules for defining the size of the margin.

        Specified by:
        setMargin in interface Layout.MarginHandler
        Parameters:
        marginInfo - MarginInfo object containing the new margins.

      • setHideEmptyRowsAndColumns

        public void setHideEmptyRowsAndColumns​(boolean hideEmptyRowsAndColumns)
        Sets whether empty rows and columns should be considered as non-existent when rendering or not. If this is set to true then the spacing between multiple empty columns (or rows) will be collapsed. The default behavior is to consider all rows and columns as visible NOTE that this must be set before the initial rendering takes place. Updating this on the fly is not supported.
        Parameters:
        hideEmptyRowsAndColumns - true to hide empty rows and columns, false to leave them as-is
        Since:
        7.3

      • isHideEmptyRowsAndColumns

        public boolean isHideEmptyRowsAndColumns()
        Checks whether whether empty rows and columns should be considered as non-existent when rendering or not.
        Returns:
        true if empty rows and columns are hidden, false otherwise
        Since:
        7.3
        See Also:
        setHideEmptyRowsAndColumns(boolean)

      • readDesign

        public void readDesign​(org.jsoup.nodes.Element design,
                       DesignContext designContext)
        Reads the component state from the given design.

        The component is responsible not only for updating its own state but also for ensuring that its children update their state based on the design.

        It is assumed that the component is in its default state when this method is called. Reading should only take into consideration attributes specified in the design and not reset any unspecified attributes to their defaults.

        This method must not modify the design.

        After reading the design, cursorY is set to point to a row outside of the GridLayout area. CursorX is reset to 0.

        Specified by:
        readDesign in interface Component
        Overrides:
        readDesign in class AbstractComponent
        Parameters:
        design - The element to obtain the state from
        designContext - The DesignContext instance used for parsing the design

      • writeDesign

        public void writeDesign​(org.jsoup.nodes.Element design,
                        DesignContext designContext)
        Description copied from interface: Component
        Writes the component state to the given design.

        The component is responsible not only for writing its own state but also for ensuring that its children write their state to the design.

        This method must not modify the component state.

        Specified by:
        writeDesign in interface Component
        Overrides:
        writeDesign in class AbstractComponent
        Parameters:
        design - The element to write the component state to. Any previous attributes or child nodes are not cleared.
        designContext - The DesignContext instance used for writing the design