Sep 29
Check out the interesting article at Joel’s website: http://www.joelonsoftware.com/items/2009/09/23.html
Sep 28
Have you heard that Java support scripting engine? Try the source code below:
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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public class TestScript {
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String script = "println(’Hello, world’);";
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script += "s=0;";
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script += "for(var i=1; i<=100; i++)";
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script += "s += i;";
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script += "println(’s=’+s);";
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ScriptEngineManager factory = new ScriptEngineManager();
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ScriptEngine engine = factory.getEngineByName("JavaScript");
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try {
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engine.eval(script);
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} catch (ScriptException e) {
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e.printStackTrace();
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}
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}
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}
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Sep 25
Let’s say you need to dynamically adjust a widget size, and then update scroll bar information. Things are pretty simple, if we understand how eclipse layout works.
I have a PageBook widget, and wish to resize the form page as selection changes. Here is the important part:
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// other code
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pageBook.showPage(parent);
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// the following two statements are very important, because they will tell swt/jface how to layout.
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GridDataFactory.defaultsFor(pageBook).align(SWT.FILL, SWT.TOP).span(2, 1).hint(SWT.DEFAULT, computeSize.y + 20).applyTo(pageBook);
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pageBook.layout(true, true);
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// reflow the form
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form.reflow(true);
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Sep 24
Below is very straightforward code snippet to use PageBook. It is used together with eclipse form. Therefore you will see widgets are created via the FormToolkit class.
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toolkit = new FormToolkit(container.getDisplay());
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form = toolkit.createScrolledForm(container);
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GridLayoutFactory.fillDefaults().numColumns(1).applyTo(parent);
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// create a table as selection provider
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final Table table = toolkit.createTable(parent, SWT.BORDER | SWT.VIRTUAL);
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table.setHeaderVisible(true);
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table.setLinesVisible(true);
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for(int i=1; i<=12; i++){
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TableItem item = new TableItem(table, 0);
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item.setText("Item " + i);
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}
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toolkit.createLabel(parent, "Selected pagebook:");
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// create a PageBook
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final ScrolledPageBook pageBook = toolkit.createPageBook(parent, SWT.NONE);
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GridDataFactory.defaultsFor(pageBook).grab(true, true).applyTo(pageBook);
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// create PageBook controls
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for(int i=0; i<table.getItemCount(); i++){
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TableItem item = table.getItem(i);
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GridLayoutFactory.fillDefaults().numColumns(1).applyTo(pageContainer);
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toolkit.createLabel(pageContainer, item.getText());
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toolkit.createText(pageContainer, "to be edited");
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pageBook.showPage(item.getText());
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}
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pageBook.showEmptyPage();
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// add selection listener, and show relative PageBook on selection
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table.addSelectionListener(new SelectionAdapter(){
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public void widgetSelected(SelectionEvent e) {
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TableItem item = (TableItem) e.item;
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pageBook.showPage(item.getText());
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}
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});
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