org.eclipse.swt.layout
Class GridData

java.lang.Object
  org.eclipse.swt.layout.GridData

public final class GridData
extends java.lang.Object

GridData is the layout data object associated with GridLayout. To set a GridData object into a control, you use the Control.setLayoutData(Object) method.

There are two ways to create a GridData object with certain fields set. The first is to set the fields directly, like this:

      GridData gridData = new GridData();
      gridData.horizontalAlignment = GridData.FILL;
      gridData.grabExcessHorizontalSpace = true;
      button1.setLayoutData(gridData);
 
                gridData = new GridData();
                gridData.horizontalAlignment = GridData.FILL;
                gridData.verticalAlignment = GridData.FILL;
                gridData.grabExcessHorizontalSpace = true;
                gridData.grabExcessVerticalSpace = true;
                gridData.horizontalSpan = 2;
                button2.setLayoutData(gridData);
 

The second is to take advantage of GridData convenience constructors, for example:

      button1.setLayoutData(new GridData (SWT.FILL, SWT.CENTER, true, false));
      button2.setLayoutData(new GridData (SWT.FILL, SWT.FILL, true, true, 2, 1));
 

NOTE: Do not reuse GridData objects. Every control in a Composite that is managed by a GridLayout must have a unique GridData object. If the layout data for a control in a GridLayout is null at layout time, a unique GridData object is created for it.

Since:

1.0

See Also:

GridLayout, Control.setLayoutData(java.lang.Object), Sample code and further information

Field Summary

static int	BEGINNING Value for horizontalAlignment or verticalAlignment.
static int	CENTER Value for horizontalAlignment or verticalAlignment.
static int	END Value for horizontalAlignment or verticalAlignment.
boolean	exclude exclude informs the layout to ignore this control when sizing and positioning controls.
static int	FILL Value for horizontalAlignment or verticalAlignment.
static int	FILL_BOTH Style bit for new GridData(int) to resize the control to fill the cell horizontally and vertically and to fit the remaining horizontal and vertical space.
static int	FILL_HORIZONTAL Style bit for new GridData(int) to resize the control to fill the cell horizontally and to fit the remaining horizontal space.
static int	FILL_VERTICAL Style bit for new GridData(int) to resize the control to fill the cell vertically and to fit the remaining vertical space.
static int	GRAB_HORIZONTAL Style bit for new GridData(int) to resize the control to fit the remaining horizontal space.
static int	GRAB_VERTICAL Style bit for new GridData(int) to resize the control to fit the remaining vertical space.
boolean	grabExcessHorizontalSpace grabExcessHorizontalSpace specifies whether the width of the cell changes depending on the size of the parent Composite.
boolean	grabExcessVerticalSpace grabExcessVerticalSpace specifies whether the height of the cell changes depending on the size of the parent Composite.
int	heightHint heightHint specifies the preferred height in pixels.
static int	HORIZONTAL_ALIGN_BEGINNING Style bit for new GridData(int) to position the control at the left of the cell.
static int	HORIZONTAL_ALIGN_CENTER Style bit for new GridData(int) to position the control in the horizontal center of the cell.
static int	HORIZONTAL_ALIGN_END Style bit for new GridData(int) to position the control at the right of the cell.
static int	HORIZONTAL_ALIGN_FILL Style bit for new GridData(int) to resize the control to fill the cell horizontally.
int	horizontalAlignment horizontalAlignment specifies how controls will be positioned horizontally within a cell.
int	horizontalIndent horizontalIndent specifies the number of pixels of indentation that will be placed along the left side of the cell.
int	horizontalSpan horizontalSpan specifies the number of column cells that the control will take up.
int	minimumHeight minimumHeight specifies the minimum height in pixels.
int	minimumWidth minimumWidth specifies the minimum width in pixels.
static int	VERTICAL_ALIGN_BEGINNING Style bit for new GridData(int).
static int	VERTICAL_ALIGN_CENTER Style bit for new GridData(int) to position the control in the vertical center of the cell.
static int	VERTICAL_ALIGN_END Style bit for new GridData(int) to position the control at the bottom of the cell.
static int	VERTICAL_ALIGN_FILL Style bit for new GridData(int) to resize the control to fill the cell vertically.
int	verticalAlignment verticalAlignment specifies how controls will be positioned vertically within a cell.
int	verticalIndent verticalIndent specifies the number of pixels of indentation that will be placed along the top side of the cell.
int	verticalSpan verticalSpan specifies the number of row cells that the control will take up.
int	widthHint widthHint specifies the preferred width in pixels.

Constructor Summary

GridData()
Constructs a new instance of GridData using default values.

GridData(int style)
Constructs a new instance based on the GridData style.

GridData(int width, int height)
Constructs a new instance of GridData according to the parameters.

GridData(int horizontalAlignment, int verticalAlignment, boolean grabExcessHorizontalSpace, boolean grabExcessVerticalSpace)
Constructs a new instance of GridData according to the parameters.

GridData(int horizontalAlignment, int verticalAlignment, boolean grabExcessHorizontalSpace, boolean grabExcessVerticalSpace, int horizontalSpan, int verticalSpan)
Constructs a new instance of GridData according to the parameters.

Method Summary

java.lang.String

toString() Returns a string containing a concise, human-readable description of the receiver.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

verticalAlignment

public int verticalAlignment

verticalAlignment specifies how controls will be positioned vertically within a cell. The default value is CENTER. Possible values are:

• SWT.BEGINNING (or SWT.TOP): Position the control at the top of the cell
• SWT.CENTER: Position the control in the vertical center of the cell
• SWT.END (or SWT.BOTTOM): Position the control at the bottom of the cell
• SWT.FILL: Resize the control to fill the cell vertically

horizontalAlignment

public int horizontalAlignment

horizontalAlignment specifies how controls will be positioned horizontally within a cell. The default value is BEGINNING. Possible values are:

• SWT.BEGINNING (or SWT.LEFT): Position the control at the left of the cell
• SWT.CENTER: Position the control in the horizontal center of the cell
• SWT.END (or SWT.RIGHT): Position the control at the right of the cell
• SWT.FILL: Resize the control to fill the cell horizontally

widthHint

public int widthHint

widthHint specifies the preferred width in pixels. This value is the wHint passed into Control.computeSize(int, int, boolean) to determine the preferred size of the control. The default value is SWT.DEFAULT.

See Also:

Control.computeSize(int, int, boolean)

heightHint

public int heightHint

heightHint specifies the preferred height in pixels. This value is the hHint passed into Control.computeSize(int, int, boolean) to determine the preferred size of the control. The default value is SWT.DEFAULT.

See Also:

Control.computeSize(int, int, boolean)

horizontalIndent

public int horizontalIndent

horizontalIndent specifies the number of pixels of indentation that will be placed along the left side of the cell. The default value is 0.

verticalIndent

public int verticalIndent

verticalIndent specifies the number of pixels of indentation that will be placed along the top side of the cell. The default value is 0.

horizontalSpan

public int horizontalSpan

horizontalSpan specifies the number of column cells that the control will take up. The default value is 1.

verticalSpan

public int verticalSpan

verticalSpan specifies the number of row cells that the control will take up. The default value is 1.

grabExcessHorizontalSpace

public boolean grabExcessHorizontalSpace

grabExcessHorizontalSpace specifies whether the width of the cell changes depending on the size of the parent Composite. If grabExcessHorizontalSpace is true, the following rules apply to the width of the cell:

• If extra horizontal space is available in the parent, the cell will grow to be wider than its preferred width. The new width will be "preferred width + delta" where delta is the extra horizontal space divided by the number of grabbing columns.
• If there is not enough horizontal space available in the parent, the cell will shrink until it reaches its minimum width as specified by GridData.minimumWidth. The new width will be the maximum of "minimumWidth" and "preferred width - delta", where delta is the amount of space missing divided by the number of grabbing columns.
• If the parent is packed, the cell will be its preferred width as specified by GridData.widthHint.
• If the control spans multiple columns and there are no other grabbing controls in any of the spanned columns, the last column in the span will grab the extra space. If there is at least one other grabbing control in the span, the grabbing will be spread over the columns already marked as grabExcessHorizontalSpace.

The default value is false.

See Also:

minimumWidth, widthHint

grabExcessVerticalSpace

public boolean grabExcessVerticalSpace

grabExcessVerticalSpace specifies whether the height of the cell changes depending on the size of the parent Composite. If grabExcessVerticalSpace is true, the following rules apply to the height of the cell:

• If extra vertical space is available in the parent, the cell will grow to be taller than its preferred height. The new height will be "preferred height + delta" where delta is the extra vertical space divided by the number of grabbing rows.
• If there is not enough vertical space available in the parent, the cell will shrink until it reaches its minimum height as specified by GridData.minimumHeight. The new height will be the maximum of "minimumHeight" and "preferred height - delta", where delta is the amount of space missing divided by the number of grabbing rows.
• If the parent is packed, the cell will be its preferred height as specified by GridData.heightHint.
• If the control spans multiple rows and there are no other grabbing controls in any of the spanned rows, the last row in the span will grab the extra space. If there is at least one other grabbing control in the span, the grabbing will be spread over the rows already marked as grabExcessVerticalSpace.

The default value is false.

See Also:

minimumHeight, heightHint

minimumWidth

public int minimumWidth

minimumWidth specifies the minimum width in pixels. This value applies only if grabExcessHorizontalSpace is true. A value of SWT.DEFAULT means that the minimum width will be the result of Control.computeSize(int, int, boolean) where wHint is determined by GridData.widthHint. The default value is 0.

See Also:

Control.computeSize(int, int, boolean), widthHint

minimumHeight

public int minimumHeight

minimumHeight specifies the minimum height in pixels. This value applies only if grabExcessVerticalSpace is true. A value of SWT.DEFAULT means that the minimum height will be the result of Control.computeSize(int, int, boolean) where hHint is determined by GridData.heightHint. The default value is 0.

See Also:

Control.computeSize(int, int, boolean), heightHint

exclude

public boolean exclude

exclude informs the layout to ignore this control when sizing and positioning controls. If this value is true, the size and position of the control will not be managed by the layout. If this value is false, the size and position of the control will be computed and assigned. The default value is false.

BEGINNING

public static final int BEGINNING

Value for horizontalAlignment or verticalAlignment. Position the control at the top or left of the cell. Not recommended. Use SWT.BEGINNING, SWT.TOP or SWT.LEFT instead.

See Also:

Constant Field Values

CENTER

public static final int CENTER

Value for horizontalAlignment or verticalAlignment. Position the control in the vertical or horizontal center of the cell Not recommended. Use SWT.CENTER instead.

See Also:

Constant Field Values

END

public static final int END

Value for horizontalAlignment or verticalAlignment. Position the control at the bottom or right of the cell Not recommended. Use SWT.END, SWT.BOTTOM or SWT.RIGHT instead.

See Also:

Constant Field Values

FILL

public static final int FILL

Value for horizontalAlignment or verticalAlignment. Resize the control to fill the cell horizontally or vertically. Not recommended. Use SWT.FILL instead.

See Also:

Constant Field Values

VERTICAL_ALIGN_BEGINNING

public static final int VERTICAL_ALIGN_BEGINNING

Style bit for new GridData(int). Position the control at the top of the cell. Not recommended. Use new GridData(int, SWT.BEGINNING, boolean, boolean) instead.

See Also:

Constant Field Values

VERTICAL_ALIGN_CENTER

public static final int VERTICAL_ALIGN_CENTER

Style bit for new GridData(int) to position the control in the vertical center of the cell. Not recommended. Use new GridData(int, SWT.CENTER, boolean, boolean) instead.

See Also:

Constant Field Values

VERTICAL_ALIGN_END

public static final int VERTICAL_ALIGN_END

Style bit for new GridData(int) to position the control at the bottom of the cell. Not recommended. Use new GridData(int, SWT.END, boolean, boolean) instead.

See Also:

Constant Field Values

VERTICAL_ALIGN_FILL

public static final int VERTICAL_ALIGN_FILL

Style bit for new GridData(int) to resize the control to fill the cell vertically. Not recommended. Use new GridData(int, SWT.FILL, boolean, boolean) instead

See Also:

Constant Field Values

HORIZONTAL_ALIGN_BEGINNING

public static final int HORIZONTAL_ALIGN_BEGINNING

Style bit for new GridData(int) to position the control at the left of the cell. Not recommended. Use new GridData(SWT.BEGINNING, int, boolean, boolean) instead.

See Also:

Constant Field Values

HORIZONTAL_ALIGN_CENTER

public static final int HORIZONTAL_ALIGN_CENTER

Style bit for new GridData(int) to position the control in the horizontal center of the cell. Not recommended. Use new GridData(SWT.CENTER, int, boolean, boolean) instead.

See Also:

Constant Field Values

HORIZONTAL_ALIGN_END

public static final int HORIZONTAL_ALIGN_END

Style bit for new GridData(int) to position the control at the right of the cell. Not recommended. Use new GridData(SWT.END, int, boolean, boolean) instead.

See Also:

Constant Field Values

HORIZONTAL_ALIGN_FILL

public static final int HORIZONTAL_ALIGN_FILL

Style bit for new GridData(int) to resize the control to fill the cell horizontally. Not recommended. Use new GridData(SWT.FILL, int, boolean, boolean) instead.

See Also:

Constant Field Values

GRAB_HORIZONTAL

public static final int GRAB_HORIZONTAL

Style bit for new GridData(int) to resize the control to fit the remaining horizontal space. Not recommended. Use new GridData(int, int, true, boolean) instead.

See Also:

Constant Field Values

GRAB_VERTICAL

public static final int GRAB_VERTICAL

Style bit for new GridData(int) to resize the control to fit the remaining vertical space. Not recommended. Use new GridData(int, int, boolean, true) instead.

See Also:

Constant Field Values

FILL_VERTICAL

public static final int FILL_VERTICAL

Style bit for new GridData(int) to resize the control to fill the cell vertically and to fit the remaining vertical space. FILL_VERTICAL = VERTICAL_ALIGN_FILL | GRAB_VERTICAL Not recommended. Use new GridData(int, SWT.FILL, boolean, true) instead.

See Also:

Constant Field Values

FILL_HORIZONTAL

public static final int FILL_HORIZONTAL

Style bit for new GridData(int) to resize the control to fill the cell horizontally and to fit the remaining horizontal space. FILL_HORIZONTAL = HORIZONTAL_ALIGN_FILL | GRAB_HORIZONTAL Not recommended. Use new GridData(SWT.FILL, int, true, boolean) instead.

See Also:

Constant Field Values

FILL_BOTH

public static final int FILL_BOTH

Style bit for new GridData(int) to resize the control to fill the cell horizontally and vertically and to fit the remaining horizontal and vertical space. FILL_BOTH = FILL_VERTICAL | FILL_HORIZONTAL Not recommended. Use new GridData(SWT.FILL, SWT.FILL, true, true) instead.

See Also:

Constant Field Values

Constructor Detail

GridData

public GridData()

Constructs a new instance of GridData using default values.

GridData

public GridData(int style)

Constructs a new instance based on the GridData style. This constructor is not recommended.

Parameters:

style - the GridData style

GridData

public GridData(int horizontalAlignment,
                int verticalAlignment,
                boolean grabExcessHorizontalSpace,
                boolean grabExcessVerticalSpace)

Constructs a new instance of GridData according to the parameters.

Parameters:

horizontalAlignment - how control will be positioned horizontally within a cell, one of: SWT.BEGINNING (or SWT.LEFT), SWT.CENTER, SWT.END (or SWT.RIGHT), or SWT.FILL

verticalAlignment - how control will be positioned vertically within a cell, one of: SWT.BEGINNING (or SWT.TOP), SWT.CENTER, SWT.END (or SWT.BOTTOM), or SWT.FILL

grabExcessHorizontalSpace - whether cell will be made wide enough to fit the remaining horizontal space

grabExcessVerticalSpace - whether cell will be made high enough to fit the remaining vertical space

GridData

public GridData(int horizontalAlignment,
                int verticalAlignment,
                boolean grabExcessHorizontalSpace,
                boolean grabExcessVerticalSpace,
                int horizontalSpan,
                int verticalSpan)

Constructs a new instance of GridData according to the parameters.

Parameters:

horizontalAlignment - how control will be positioned horizontally within a cell, one of: SWT.BEGINNING (or SWT.LEFT), SWT.CENTER, SWT.END (or SWT.RIGHT), or SWT.FILL

verticalAlignment - how control will be positioned vertically within a cell, one of: SWT.BEGINNING (or SWT.TOP), SWT.CENTER, SWT.END (or SWT.BOTTOM), or SWT.FILL

grabExcessHorizontalSpace - whether cell will be made wide enough to fit the remaining horizontal space

grabExcessVerticalSpace - whether cell will be made high enough to fit the remaining vertical space

horizontalSpan - the number of column cells that the control will take up

verticalSpan - the number of row cells that the control will take up

GridData

public GridData(int width,
                int height)

Constructs a new instance of GridData according to the parameters. A value of SWT.DEFAULT indicates that no minimum width or no minimum height is specified.

Parameters:

width - a minimum width for the column

height - a minimum height for the row

Method Detail

toString

public java.lang.String toString()

Returns a string containing a concise, human-readable description of the receiver.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of the GridData object