List of usage examples for org.eclipse.swt.widgets Canvas isFocusControl
public boolean isFocusControl()
true if the receiver has the user-interface focus, and false otherwise. From source file:org.eclipse.swt.snippets.Snippet338.java
public static void main(String[] args) { Display display = new Display(); Shell parentShell = new Shell(display); parentShell.setText("Snippet 338"); parentShell.setBounds(10, 10, 100, 100); parentShell.open();/*from w w w . jav a 2 s .c om*/ Shell childShell = new Shell(parentShell); childShell.setLayout(new GridLayout()); TabFolder folder = new TabFolder(childShell, SWT.NONE); folder.setLayout(new FillLayout()); TabItem tab1 = new TabItem(folder, SWT.NONE); tab1.setText("Tab &1"); new TabItem(folder, SWT.NONE).setText("Tab &2"); Composite composite = new Composite(folder, SWT.NONE); composite.setLayout(new GridLayout()); tab1.setControl(composite); Text text1 = new Text(composite, SWT.SINGLE); /* canvas represents a custom control */ final Canvas canvas = new Canvas(composite, SWT.BORDER); canvas.setLayoutData(new GridData(300, 200)); canvas.addListener(SWT.Paint, event -> { if (canvas.isFocusControl()) { event.gc.drawText( "focus is here, custom traverse keys:\n\tN: Tab next\n\tP: Tab previous\n\tR: Return\n\tE: Esc\n\tT: Tab Folder next page", 0, 0); } else { event.gc.drawString("focus is not in this control", 0, 0); } }); canvas.addListener(SWT.KeyDown, event -> { int traversal = SWT.NONE; switch (event.keyCode) { case 'n': traversal = SWT.TRAVERSE_TAB_NEXT; break; case 'p': traversal = SWT.TRAVERSE_TAB_PREVIOUS; break; case 'r': traversal = SWT.TRAVERSE_RETURN; break; case 'e': traversal = SWT.TRAVERSE_ESCAPE; break; case 't': traversal = SWT.TRAVERSE_PAGE_NEXT; break; } if (traversal != SWT.NONE) { event.doit = true; /* this will be the Traverse event's initial doit value */ canvas.traverse(traversal, event); } }); canvas.addFocusListener(focusLostAdapter(e -> canvas.redraw())); canvas.addFocusListener(focusGainedAdapter(e -> canvas.redraw())); Text text2 = new Text(composite, SWT.SINGLE); Button button = new Button(childShell, SWT.PUSH); button.setText("Default &Button"); button.addListener(SWT.Selection, event -> System.out.println("Default button selected")); childShell.setDefaultButton(button); Listener printTraverseListener = event -> { StringBuilder buffer = new StringBuilder("Traverse "); buffer.append(event.widget); buffer.append(" type="); switch (event.detail) { case SWT.TRAVERSE_ARROW_NEXT: buffer.append("TRAVERSE_ARROW_NEXT"); break; case SWT.TRAVERSE_ARROW_PREVIOUS: buffer.append("TRAVERSE_ARROW_NEXT"); break; case SWT.TRAVERSE_ESCAPE: buffer.append("TRAVERSE_ESCAPE"); break; case SWT.TRAVERSE_MNEMONIC: buffer.append("TRAVERSE_MNEMONIC"); break; case SWT.TRAVERSE_PAGE_NEXT: buffer.append("TRAVERSE_PAGE_NEXT"); break; case SWT.TRAVERSE_PAGE_PREVIOUS: buffer.append("TRAVERSE_PAGE_PREVIOUS"); break; case SWT.TRAVERSE_RETURN: buffer.append("TRAVERSE_RETURN"); break; case SWT.TRAVERSE_TAB_NEXT: buffer.append("TRAVERSE_TAB_NEXT"); break; case SWT.TRAVERSE_TAB_PREVIOUS: buffer.append("TRAVERSE_TAB_PREVIOUS"); break; } buffer.append(" doit=" + event.doit); buffer.append(" keycode=" + event.keyCode); buffer.append(" char=" + event.character); buffer.append(" stateMask=" + event.stateMask); System.out.println(buffer.toString()); }; childShell.addListener(SWT.Traverse, printTraverseListener); folder.addListener(SWT.Traverse, printTraverseListener); composite.addListener(SWT.Traverse, printTraverseListener); canvas.addListener(SWT.Traverse, printTraverseListener); button.addListener(SWT.Traverse, printTraverseListener); text1.addListener(SWT.Traverse, printTraverseListener); text2.addListener(SWT.Traverse, printTraverseListener); childShell.pack(); childShell.open(); text1.setFocus(); while (!parentShell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }
From source file:Snippet21.java
public static void main(String[] args) { Display display = new Display(); final Color red = display.getSystemColor(SWT.COLOR_RED); final Color blue = display.getSystemColor(SWT.COLOR_BLUE); Shell shell = new Shell(display); Button b = new Button(shell, SWT.PUSH); b.setBounds(10, 10, 100, 32);/*w w w . ja v a 2s. c o m*/ b.setText("Button"); shell.setDefaultButton(b); final Canvas c = new Canvas(shell, SWT.BORDER); c.setBounds(10, 50, 100, 32); c.addListener(SWT.Traverse, new Listener() { public void handleEvent(Event e) { switch (e.detail) { /* Do tab group traversal */ case SWT.TRAVERSE_ESCAPE: case SWT.TRAVERSE_RETURN: case SWT.TRAVERSE_TAB_NEXT: case SWT.TRAVERSE_TAB_PREVIOUS: case SWT.TRAVERSE_PAGE_NEXT: case SWT.TRAVERSE_PAGE_PREVIOUS: e.doit = true; break; } } }); c.addListener(SWT.FocusIn, new Listener() { public void handleEvent(Event e) { c.setBackground(red); } }); c.addListener(SWT.FocusOut, new Listener() { public void handleEvent(Event e) { c.setBackground(blue); } }); c.addListener(SWT.KeyDown, new Listener() { public void handleEvent(Event e) { System.out.println("KEY"); for (int i = 0; i < 64; i++) { Color c1 = red, c2 = blue; if (c.isFocusControl()) { c1 = blue; c2 = red; } c.setBackground(c1); c.update(); c.setBackground(c2); } } }); Text t = new Text(shell, SWT.SINGLE | SWT.BORDER); t.setBounds(10, 85, 100, 32); Text r = new Text(shell, SWT.MULTI | SWT.BORDER); r.setBounds(10, 120, 100, 32); c.setFocus(); shell.setSize(200, 200); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); }