Package org.eclipse.swt.custom

Class CTabFolderRenderer

java.lang.Object

org.eclipse.swt.custom.CTabFolderRenderer

Direct Known Subclasses:

CTabRendering

public class CTabFolderRenderer
extends Object

Instances of this class provide all of the measuring and drawing functionality required by CTabFolder. This class can be subclassed in order to customize the look of a CTabFolder.

Since:

3.6

See Also:

• Sample code and further information

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MINIMUM_SIZE
protected CTabFolder	parent
static final int	PART_BACKGROUND	Part constant indicating the background of the tab folder.
static final int	PART_BODY	Part constant indicating the body of the tab folder.
static final int	PART_BORDER	Part constant indicating the border of the tab folder.
static final int	PART_CHEVRON_BUTTON	Part constant indicating the chevron button of the tab folder.
static final int	PART_CLOSE_BUTTON	Part constant indicating the close button of a tab item.
static final int	PART_HEADER	Part constant indicating the tab header of the folder (value is -2).
static final int	PART_MAX_BUTTON	Part constant indicating the maximize button of the tab folder.
static final int	PART_MIN_BUTTON	Part constant indicating the minimize button of the tab folder.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CTabFolderRenderer(CTabFolder parent)	Constructs a new instance of this class given its parent.

Method Summary

Modifier and Type	Method	Description
protected Point	computeSize(int part, int state, GC gc, int wHint, int hHint)	Returns the preferred size of a part.
protected Rectangle	computeTrim(int part, int state, int x, int y, int width, int height)	Given a desired client area for the part (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.
protected void	dispose()	Dispose of any operating system resources associated with the renderer.
protected void	draw(int part, int state, Rectangle bounds, GC gc)	Draw a specified part of the CTabFolder using the provided bounds and GC.

Methods inherited from class java.lang.Object

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

Field Details

parent

protected CTabFolder parent

PART_BODY

public static final int PART_BODY

Part constant indicating the body of the tab folder. The body is the underlying container for all of the tab folder and all other parts are drawn on top of it. (value is -1).

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_HEADER

public static final int PART_HEADER

Part constant indicating the tab header of the folder (value is -2). The header is drawn on top of the body and provides an area for the tabs and other tab folder buttons to be rendered.

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_BORDER

public static final int PART_BORDER

Part constant indicating the border of the tab folder. (value is -3). The border is drawn around the body and is part of the body trim.

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_BACKGROUND

public static final int PART_BACKGROUND

Part constant indicating the background of the tab folder. (value is -4).

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_MAX_BUTTON

public static final int PART_MAX_BUTTON

Part constant indicating the maximize button of the tab folder. (value is -5).

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_MIN_BUTTON

public static final int PART_MIN_BUTTON

Part constant indicating the minimize button of the tab folder. (value is -6).

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_CHEVRON_BUTTON

public static final int PART_CHEVRON_BUTTON

Part constant indicating the chevron button of the tab folder. (value is -7).

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

PART_CLOSE_BUTTON

public static final int PART_CLOSE_BUTTON

Part constant indicating the close button of a tab item. (value is -8).

See Also:

• computeSize(int, int, GC, int, int)
• computeTrim(int, int, int, int, int, int)
• draw(int, int, Rectangle, GC)
• Constant Field Values

MINIMUM_SIZE

public static final int MINIMUM_SIZE

See Also:

• Constant Field Values

Constructor Details

CTabFolderRenderer

protected CTabFolderRenderer(CTabFolder parent)

Constructs a new instance of this class given its parent.

Parameters:

parent - CTabFolder

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the parent is disposed

See Also:

• Widget.getStyle()

Method Details

computeSize

protected Point computeSize(int part,
 int state,
 GC gc,
 int wHint,
 int hHint)

Returns the preferred size of a part.

The preferred size of a part is the size that it would best be displayed at. The width hint and height hint arguments allow the caller to ask a control questions such as "Given a particular width, how high does the part need to be to show all of the contents?" To indicate that the caller does not wish to constrain a particular dimension, the constant SWT.DEFAULT is passed for the hint.

The part value indicated what component the preferred size is to be calculated for. Valid values are any of the part constants:

• PART_BODY
• PART_HEADER
• PART_BORDER
• PART_BACKGROUND
• PART_MAX_BUTTON
• PART_MIN_BUTTON
• PART_CHEVRON_BUTTON
• PART_CLOSE_BUTTON
• A positive integer which is the index of an item in the CTabFolder.

The state parameter may be one of the following:

• SWT.NONE
• SWT.SELECTED - whether the part is selected

Parameters:

part - a part constant

state - current state

gc - the gc to use for measuring

wHint - the width hint (can be SWT.DEFAULT)

hHint - the height hint (can be SWT.DEFAULT)

Returns:

the preferred size of the part

Since:

3.6

computeTrim

protected Rectangle computeTrim(int part,
 int state,
 int x,
 int y,
 int width,
 int height)

Given a desired client area for the part (as described by the arguments), returns the bounding rectangle which would be required to produce that client area.

In other words, it returns a rectangle such that, if the part's bounds were set to that rectangle, the area of the part which is capable of displaying data (that is, not covered by the "trimmings") would be the rectangle described by the arguments (relative to the receiver's parent).

Parameters:

part - one of the part constants

state - the state of the part

x - the desired x coordinate of the client area

y - the desired y coordinate of the client area

width - the desired width of the client area

height - the desired height of the client area

Returns:

the required bounds to produce the given client area

Since:

3.6

See Also:

• valid part and state values

dispose

protected void dispose()

Dispose of any operating system resources associated with the renderer. Called by the CTabFolder parent upon receiving the dispose event or when changing the renderer.

Since:

3.6

draw

protected void draw(int part,
 int state,
 Rectangle bounds,
 GC gc)

Draw a specified part of the CTabFolder using the provided bounds and GC.

The valid CTabFolder part constants are:

• PART_BODY - the entire body of the CTabFolder
• PART_HEADER - the upper tab area of the CTabFolder
• PART_BORDER - the border of the CTabFolder
• PART_BACKGROUND - the background of the CTabFolder
• PART_MAX_BUTTON
• PART_MIN_BUTTON
• PART_CHEVRON_BUTTON
• PART_CLOSE_BUTTON
• A positive integer which is the index of an item in the CTabFolder.

The state parameter may be a combination of:

• SWT.BACKGROUND - whether the background should be drawn
• SWT.FOREGROUND - whether the foreground should be drawn
• SWT.SELECTED - whether the part is selected
• SWT.HOT - whether the part is hot (i.e. mouse is over the part)

Parameters:

part - part to draw

state - state of the part

bounds - the bounds of the part

gc - the gc to draw the part on

Since:

3.6