org.eclipse.swt.custom
Class ScrolledComposite

java.lang.Object
  |
  +--org.eclipse.swt.widgets.Widget
        |
        +--org.eclipse.swt.widgets.Control
              |
              +--org.eclipse.swt.widgets.Scrollable
                    |
                    +--org.eclipse.swt.widgets.Composite
                          |
                          +--org.eclipse.swt.custom.ScrolledComposite

All Implemented Interfaces:

Drawable

public class ScrolledComposite

extends Composite

Safe: A ScrolledComposite provides scrollbars and will scroll its content when the user uses the scrollbars.

There are two ways to use the ScrolledComposite:

1) Set the size of the control that is being scrolled and the ScrolledComposite will show scrollbars when the contained control can not be fully seen. 2) The second way imitates the way a browser would work. Set the minimum size of the control and the ScrolledComposite will show scroll bars if the visible area is less than the minimum size of the control and it will expand the size of the control if the visible area is greater than the minimum size. This requires invoking both setMinWidth(), setMinHeight() and setExpandHorizontal(), setExpandVertical().

 public static void main (String [] args) {
      Display display = new Display ();
      Color red = display.getSystemColor(SWT.COLOR_RED);
      Color blue = display.getSystemColor(SWT.COLOR_BLUE);
      Shell shell = new Shell (display);
      shell.setLayout(new FillLayout());
 	
      // set the size of the scrolled content - method 1
      final ScrolledComposite sc1 = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
      final Composite c1 = new Composite(sc1, SWT.NONE);
      sc1.setContent(c1);
      c1.setBackground(red);
      GridLayout layout = new GridLayout();
      layout.numColumns = 4;
      c1.setLayout(layout);
      Button b1 = new Button (c1, SWT.PUSH);
      b1.setText("first button");
      c1.setSize(c1.computeSize(SWT.DEFAULT, SWT.DEFAULT));
      
      // set the minimum width and height of the scrolled content - method 2
      final ScrolledComposite sc2 = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
      sc2.setExpandHorizontal(true);
      sc2.setExpandVertical(true);
      final Composite c2 = new Composite(sc2, SWT.NONE);
      sc2.setContent(c2);
      c2.setBackground(blue);
      layout = new GridLayout();
      layout.numColumns = 4;
      c2.setLayout(layout);
      Button b2 = new Button (c2, SWT.PUSH);
      b2.setText("first button");
      sc2.setMinSize(c2.computeSize(SWT.DEFAULT, SWT.DEFAULT));
      
      Button add = new Button (shell, SWT.PUSH);
      add.setText("add children");
      final int[] index = new int[]{0};
      add.addListener(SWT.Selection, new Listener() {
          public void handleEvent(Event e) {
              index[0]++;
              Button button = new Button(c1, SWT.PUSH);
              button.setText("button "+index[0]);
              // reset size of content so children can be seen - method 1
              c1.setSize(c1.computeSize(SWT.DEFAULT, SWT.DEFAULT));
              c1.layout();
              
              button = new Button(c2, SWT.PUSH);
              button.setText("button "+index[0]);
              // reset the minimum width and height so children can be seen - method 2
              sc2.setMinSize(c2.computeSize(SWT.DEFAULT, SWT.DEFAULT));
              c2.layout();
          }
      });
 
      shell.open ();
      while (!shell.isDisposed ()) {
          if (!display.readAndDispatch ()) display.sleep ();
      }
      display.dispose ();
 }
 

Styles:

H_SCROLL, V_SCROLL

Field Summary

private boolean	alwaysShowScroll
private Control	content
private Listener	contentListener
private boolean	expandHorizontal
private boolean	expandVertical
private boolean	inResize
private int	minHeight
private int	minWidth

Fields inherited from class org.eclipse.swt.widgets.Composite

Fields inherited from class org.eclipse.swt.widgets.Scrollable

Fields inherited from class org.eclipse.swt.widgets.Control

handle

Fields inherited from class org.eclipse.swt.widgets.Widget

Constructor Summary

ScrolledComposite(Composite parent, int style)
Enabled: Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

Method Summary

private static int	checkStyle(int style)
Point	computeSize(int wHint, int hHint, boolean changed) Enabled:
boolean	getAlwaysShowScrollBars() Enabled: Returns the Always Show Scrollbars flag.
Control	getContent() Enabled: Get the content that is being scrolled.
Point	getOrigin() Enabled: Return the point in the content that currenly appears in the top left corner of the scrolled composite.
private void	hScroll()
void	layout(boolean changed) Enabled:
private boolean	needHScroll(Rectangle contentRect, boolean vVisible)
private boolean	needVScroll(Rectangle contentRect, boolean hVisible)
private void	resize()
void	setAlwaysShowScrollBars(boolean show) Enabled: Set the Always Show Scrollbars flag.
void	setContent(Control content) Enabled: Set the content that will be scrolled.
void	setExpandHorizontal(boolean expand) Enabled: Configure the ScrolledComposite to resize the content object to be as wide as the ScrolledComposite when the width of the ScrolledComposite is greater than the minimum width specified in setMinWidth.
void	setExpandVertical(boolean expand) Enabled: Configure the ScrolledComposite to resize the content object to be as tall as the ScrolledComposite when the height of the ScrolledComposite is greater than the minimum height specified in setMinHeight.
void	setLayout(Layout layout) Enabled:
void	setMinHeight(int height) Enabled: Specify the minimum height at which the ScrolledComposite will begin scrolling the content with the vertical scroll bar.
void	setMinSize(int width, int height) Enabled: Specify the minimum width and height at which the ScrolledComposite will begin scrolling the content with the horizontal scroll bar.
void	setMinSize(Point size) Enabled: Specify the minimum width and height at which the ScrolledComposite will begin scrolling the content with the horizontal scroll bar.
void	setMinWidth(int width) Enabled: Specify the minimum width at which the ScrolledComposite will begin scrolling the content with the horizontal scroll bar.
void	setOrigin(int x, int y) Enabled: Scrolls the content so that the specified point in the content is in the top left corner.
void	setOrigin(Point origin) Enabled: Scrolls the content so that the specified point in the content is in the top left corner.
private void	vScroll()

Methods inherited from class org.eclipse.swt.widgets.Composite

checkSubclass, getChildren, getLayout, getTabList, layout, moveAbove, moveBelow, setFocus, setTabList

Methods inherited from class org.eclipse.swt.widgets.Scrollable

computeTrim, getClientArea, getHorizontalBar, getVerticalBar

Methods inherited from class org.eclipse.swt.widgets.Control

addControlListener, addFocusListener, addHelpListener, addKeyListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addPaintListener, addTraverseListener, computeSize, forceFocus, getAccessible, getBackground, getBorderWidth, getBounds, getDisplay, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getParent, getShell, getSize, getToolTipText, getVisible, internal_dispose_GC, internal_new_GC, isDisposed, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, redraw, redraw, removeControlListener, removeFocusListener, removeHelpListener, removeKeyListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removePaintListener, removeTraverseListener, setBackground, setBounds, setBounds, setCapture, setCursor, setEnabled, setFont, setForeground, setLayoutData, setLocation, setLocation, setMenu, setParent, setRedraw, setSize, setSize, setToolTipText, setVisible, toControl, toControl, toDisplay, toDisplay, transferActive, transferFocus, traverse, update

Methods inherited from class org.eclipse.swt.widgets.Widget

addDisposeListener, addListener, checkWidget, dispose, getData, getData, getStyle, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString

Methods inherited from class java.lang.Object

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

Field Detail

content

private Control content

contentListener

private Listener contentListener

minHeight

private int minHeight

minWidth

private int minWidth

expandHorizontal

private boolean expandHorizontal

expandVertical

private boolean expandVertical

alwaysShowScroll

private boolean alwaysShowScroll

inResize

private boolean inResize

Constructor Detail

ScrolledComposite

public ScrolledComposite(Composite parent,
                         int style)

Enabled: Constructs a new instance of this class given its parent and a style value describing its behavior and appearance.

The style value is either one of the style constants defined in class SWT which is applicable to instances of this class, or must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those SWT style constants. The class description lists the style constants that are applicable to the class. Style bits are also inherited from superclasses.

Parameters:

parent - a widget which will be the parent of the new instance (cannot be null)

style - the style of widget to construct

See Also:

SWT.H_SCROLL, SWT.V_SCROLL, Widget.getStyle()

Method Detail

checkStyle

private static int checkStyle(int style)

computeSize

public Point computeSize(int wHint,
                         int hHint,
                         boolean changed)

Enabled:

Overrides:

computeSize in class Composite

Parameters:

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

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

changed - true if the control's contents have changed, and false otherwise

Returns:

the preferred size of the control.

See Also:

Layout, Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(), "computeTrim, getClientArea for controls that implement them"

getAlwaysShowScrollBars

public boolean getAlwaysShowScrollBars()

Enabled: Returns the Always Show Scrollbars flag. True if the scrollbars are always shown even if they are not required. False if the scrollbars are only visible when some part of the composite needs to be scrolled to be seen. The H_SCROLL and V_SCROLL style bits are also required to enable scrollbars in the horizontal and vertical directions.

Returns:

the Always Show Scrollbars flag value

getContent

public Control getContent()

Enabled: Get the content that is being scrolled.

Returns:

the control displayed in the content area

hScroll

private void hScroll()

layout

public void layout(boolean changed)

Enabled:

Overrides:

layout in class Composite

Parameters:

changed - true if the layout must flush its caches, and false otherwise

needHScroll

private boolean needHScroll(Rectangle contentRect,
                            boolean vVisible)

needVScroll

private boolean needVScroll(Rectangle contentRect,
                            boolean hVisible)

resize

private void resize()

getOrigin

public Point getOrigin()

Enabled: Return the point in the content that currenly appears in the top left corner of the scrolled composite.

Returns:

the point in the content that currenly appears in the top left corner of the scrolled composite. If no content has been set, this returns (0, 0).

Since:

2.0

setOrigin

public void setOrigin(Point origin)

Enabled: Scrolls the content so that the specified point in the content is in the top left corner. If no content has been set, nothing will occur. Negative values will be ignored. Values greater than the maximum scroll distance will result in scrolling to the end of the scrollbar.

Parameters:

origin - the point on the content to appear in the top left corner

Since:

2.0

setOrigin

public void setOrigin(int x,
                      int y)

Enabled: Scrolls the content so that the specified point in the content is in the top left corner. If no content has been set, nothing will occur. Negative values will be ignored. Values greater than the maximum scroll distance will result in scrolling to the end of the scrollbar.

Parameters:

x - the x coordinate of the content to appear in the top left corner

y - the y coordinate of the content to appear in the top left corner

Since:

2.0

setAlwaysShowScrollBars

public void setAlwaysShowScrollBars(boolean show)

Enabled: Set the Always Show Scrollbars flag. True if the scrollbars are always shown even if they are not required. False if the scrollbars are only visible when some part of the composite needs to be scrolled to be seen. The H_SCROLL and V_SCROLL style bits are also required to enable scrollbars in the horizontal and vertical directions.

Parameters:

show - true to show the scrollbars even when not required, false to show scrollbars only when required

setContent

public void setContent(Control content)

Enabled: Set the content that will be scrolled.

Parameters:

content - the control to be displayed in the content area

setExpandHorizontal

public void setExpandHorizontal(boolean expand)

Enabled: Configure the ScrolledComposite to resize the content object to be as wide as the ScrolledComposite when the width of the ScrolledComposite is greater than the minimum width specified in setMinWidth. If the ScrolledComposite is less than the minimum width, the content will not resized and instead the horizontal scroll bar will be used to view the entire width. If expand is false, this behaviour is turned off. By default, this behaviour is turned off.

Parameters:

expand - true to expand the content control to fill available horizontal space

setExpandVertical

public void setExpandVertical(boolean expand)

Enabled: Configure the ScrolledComposite to resize the content object to be as tall as the ScrolledComposite when the height of the ScrolledComposite is greater than the minimum height specified in setMinHeight. If the ScrolledComposite is less than the minimum height, the content will not resized and instead the vertical scroll bar will be used to view the entire height. If expand is false, this behaviour is turned off. By default, this behaviour is turned off.

Parameters:

expand - true to expand the content control to fill available vertical space

setLayout

public void setLayout(Layout layout)

Enabled:

Overrides:

setLayout in class Composite

Parameters:

layout - the receiver's new layout or null

setMinHeight

public void setMinHeight(int height)

Enabled: Specify the minimum height at which the ScrolledComposite will begin scrolling the content with the vertical scroll bar. This value is only relevant if setExpandVertical(true) has been set.

Parameters:

height - the minimum height or 0 for default height

setMinSize

public void setMinSize(Point size)

Enabled: Specify the minimum width and height at which the ScrolledComposite will begin scrolling the content with the horizontal scroll bar. This value is only relevant if setExpandHorizontal(true) and setExpandVertical(true) have been set.

Parameters:

size - the minimum size or null for the default size

setMinSize

public void setMinSize(int width,
                       int height)

Enabled: Specify the minimum width and height at which the ScrolledComposite will begin scrolling the content with the horizontal scroll bar. This value is only relevant if setExpandHorizontal(true) and setExpandVertical(true) have been set.

Parameters:

width - the minimum width or 0 for default width

height - the minimum height or 0 for default height

setMinWidth

public void setMinWidth(int width)

Enabled: Specify the minimum width at which the ScrolledComposite will begin scrolling the content with the horizontal scroll bar. This value is only relevant if setExpandHorizontal(true) has been set.

Parameters:

width - the minimum width or 0 for default width

vScroll

private void vScroll()