Simulation of BorderLayout layout for SWT (JFace) Experience

SWT does not have the BorderLayout layout manager of AWT. The following is a custom implementation under SWT:
BorderLayout. java Copy codeThe Code is as follows: package swt_jface.demo2;
Import org. eclipse. swt. SWT;
Import org. eclipse. swt. graphics. Point;
Import org. eclipse. swt. graphics. Rectangle;
Import org. eclipse. swt. widgets. Composite;
Import org. eclipse. swt. widgets. Control;
Import org. eclipse. swt. widgets. Layout;
Public class BorderLayout extends Layout {
Public static final int NORTH = 0;
Public static final int SOUTH = 1;
Public static final int CENTER = 2;
Public static final int EAST = 3;
Public static final int WEST = 4;
Public static class BorderData {

Public int region = CENTER;
Public BorderData (){
}
Public BorderData (int region ){
This. region = region;
}
}
Public Control [] controls = new Control [5];
Point [] sizes;
Int width;
Int height;
Protected Point computeSize (Composite composite, int wHint, int hHint, boolean flushCache ){

If (sizes = null | flushCache = true)
RefreshSizes (composite. getChildren ());
Int w = wHint;
Int h = hHint;
If (w = SWT. DEFAULT) w = width;
If (h = SWT. DEFAULT) h = height;
Return new Point (w, h );
}
Protected void layout (Composite composite, boolean flushCache ){
If (flushCache | sizes = null)
RefreshSizes (composite. getChildren ());
Rectangle clientArea = composite. getClientArea ();
If (controls [NORTH]! = Null ){
Controls [NORTH]. setBounds (
ClientArea. x,
ClientArea. y,
ClientArea. width,
Sizes [NORTH]. y );
}
If (controls [SOUTH]! = Null ){
Controls [SOUTH]. setBounds (
ClientArea. x,
ClientArea. y + clientArea. height-sizes [SOUTH]. y,
ClientArea. width,
Sizes [SOUTH]. y );
}
If (controls [WEST]! = Null ){
Controls [WEST]. setBounds (
ClientArea. x,
ClientArea. y + sizes [NORTH]. y,
Sizes [WEST]. x,
ClientArea. height-sizes [NORTH]. y-sizes [SOUTH]. y );
}
If (controls [EAST]! = Null ){
Controls [EAST]. setBounds (
ClientArea. x + clientArea. width-sizes [EAST]. x,
ClientArea. y + sizes [NORTH]. y,
Sizes [EAST]. x,
ClientArea. height-sizes [NORTH]. y-sizes [SOUTH]. y );
}
If (controls [CENTER]! = Null ){
Controls [CENTER]. setBounds (
ClientArea. x + sizes [WEST]. x,
ClientArea. y + sizes [NORTH]. y,
ClientArea. width-sizes [WEST]. x-sizes [EAST]. x,
ClientArea. height-sizes [NORTH]. y-sizes [SOUTH]. y );
}
}
Private void refreshSizes (Control [] children ){

For (int I = 0; I <children. length; I ++ ){
Object layoutData = children [I]. getLayoutData ();
If (layoutData = null | (! (LayoutData instanceof BorderData )))
Continue;
BorderData borderData = (BorderData) layoutData;
If (borderData. region <0 | borderData. region> 4) // Invalid.
Continue;
Controls [borderData. region] = children [I];
}
Width = 0;
Height = 0;
If (sizes = null)
Sizes = new Point [5];
For (int I = 0; I <controls. length; I ++ ){
Control control = controls [I];
If (control = null ){
Sizes [I] = new Point (0, 0 );
} Else {
Sizes [I] = control. computeSize (SWT. DEFAULT, SWT. DEFAULT, true );
}
}
Width = Math. max (width, sizes [NORTH]. x );
Width = Math. max (width, sizes [WEST]. x + sizes [CENTER]. x + sizes [EAST]. x );
Width = Math. max (width, sizes [SOUTH]. x );
Height = Math. max (Math. max (sizes [WEST]. y, sizes [EAST]. y), sizes [CENTER]. y)
+ Sizes [NORTH]. y
+ Sizes [SOUTH]. y;
}
}

Test code:
BorderLayoutSample. javaCopy codeThe Code is as follows: package swt_jface.demo2;
Import org. eclipse. swt. SWT;
Import org. eclipse. swt. widgets. Button;
Import org. eclipse. swt. widgets. Display;
Import org. eclipse. swt. widgets. Shell;
Import org. eclipse. swt. widgets. Text;
Public class BorderLayoutSample {

Display display = new Display ();
Shell shell = new Shell (display );
Public BorderLayoutSample (){

Shell. setLayout (new BorderLayout ());

Button buttonWest = new Button (shell, SWT. PUSH );
ButtonWest. setText ("West ");
ButtonWest. setLayoutData (new BorderLayout. BorderData (BorderLayout. WEST ));

Button buttonEast = new Button (shell, SWT. PUSH );
ButtonEast. setText ("East ");
ButtonEast. setLayoutData (new BorderLayout. BorderData (BorderLayout. EAST ));
Button buttonNorth = new Button (shell, SWT. PUSH );
ButtonNorth. setText ("North ");
ButtonNorth. setLayoutData (new BorderLayout. BorderData (BorderLayout. NORTH ));

Button buttonSouth = new Button (shell, SWT. PUSH );
ButtonSouth. setText ("South ");
ButtonSouth. setLayoutData (new BorderLayout. BorderData (BorderLayout. SOUTH ));

Text text = new Text (shell, SWT. MULTI | SWT. BORDER | SWT. V_SCROLL | SWT. H_SCROLL );
Text. setText ("Center ");
Text. setLayoutData (new BorderLayout. BorderData (BorderLayout. CENTER ));

Shell. pack ();
Shell. open ();

While (! Shell. isDisposed ()){
If (! Display. readAndDispatch ()){
Display. sleep ();
}
}
Display. dispose ();
}
Public static void main (String [] args ){
New BorderLayoutSample ();
}
}