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POSWT: Nested Layouts with ScrolledComposite exceeds available space
 

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  1. POSWT: Nested Layouts with ScrolledComposite exceeds available space
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    <p>I want to build a Master-Detail layout for one of my applications using SWT.</p> <p>Container, Content, Sidebar and Part1 are Composite instances. Scrolled is a ScrolledComposite</p> <p>The desired layout is something like:</p> <pre><code>+--Container-------------------------------------+ |+--Content----------------------++--Sidebar----+| || ||+--Part1----+|| || ||| ||| || ||| ||| || ||| ||| || ||| ||| || ||| ||| || ||+-----------+|| || ||+--Scrolled-+|| || ||| ||| || ||| ||| || ||| ||| || ||| ||| || ||| ||| || ||+-----------+|| |+-------------------------------++-------------+| +------------------------------------------------+ </code></pre> <p>The Content should grab all the space horizontally and vertically that is available.</p> <p>The sidebar is basically a container for Part1 and Scrolled which should be of equal height.</p> <p>Scrolled is the container for a Composite containing a dynamic number of sub items which are arranged in the content composite. Because there can be a large variation of the number of sub-items, this Composite should be scrollable.</p> <p>I have now implemented this in the following way:</p> <ul> <li><p>Container has a GridLayout with 2 colums.</p></li> <li><p>Inside of that the content has FILL_BOTH behaviour and grabs also all HORIZONTAL/VERTICAL space.</p></li> <li><p>The sidebar has a FillLayout(SWT.VERTICAL) and contains the Part1 and Scrolled Childs.</p></li> </ul> <p><strong>Problem:</strong> When putting a lot of items into the scrolled composite and the layout just overflows the available space and there is no scrolling available where it should be.</p> <p>When I use a FillLayout(SWT.HORIZONTAL) for the container the behaviour is as desired, since there is a scrolling and everything is "inside bounds".</p> <p>Is there a way to achieve this behaviour also when using a GridLayout because I want the content to grab most of the space.</p> <p>Attached the current test SWT snippet:</p> <pre><code>public class Scrolled { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new GridLayout(2,false)); //shell.setLayout(new FillLayout(SWT.HORIZONTAL)); Composite content = new Composite(shell, SWT.BORDER); content.setLayoutData(new GridData(SWT.LEFT,SWT.CENTER,false,false)); Composite sidebar = new Composite(shell, SWT.BORDER); sidebar.setLayout(new FillLayout(SWT.VERTICAL)); sidebar.setLayoutData(new GridData(SWT.LEFT,SWT.CENTER,false,false)); Composite cc = new Composite(sidebar, SWT.BORDER); ScrolledComposite sc = new ScrolledComposite(sidebar, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL); sc.setLayout(new GridLayout(1,true)); Composite c = new Composite(sc, SWT.NONE); c.setSize(400, 400); c.setLayout(new GridLayout(1, true)); for(int i = 0; i &lt; 1000; i++){ new Button(c, SWT.PUSH).setText("Text"); } sc.setMinSize(c.computeSize(SWT.DEFAULT, SWT.DEFAULT)); sc.setContent(c); sc.setExpandHorizontal(true); sc.setExpandVertical(true); sc.setAlwaysShowScrollBars(true); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } } </code></pre>
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