[news.eclipse.platform.swt] Re: Drawing to GC

["Steve Northover" <steve_northover@xxxxxxxxxx>]

You leak too!

"Angel Shishkov" <a_shishkov@xxxxxxxxx> wrote in message
news:badg5b$er2$1@xxxxxxxxxxxxxxxx
> Thanks Grant, that did the trick. Our code was identical except for one
line
> I was missing: gc.dispose(); I did a few experiments and it looks like if
> you don't dispose the GC you get a completely black label.
>
> Thanks again.
>
> Angel
>
>
> "Grant Gayed" <grant_gayed@xxxxxxxxxx> wrote in message
> news:badeg8$cs5$1@xxxxxxxxxxxxxxxx
> > This does it through JFace (direct to an swt Tree shouldn't be any
> > different w.r.t. creating the Image):
> >
> > public static void main (String[] args) {
> > final Display display = new Display();
> > Shell shell = new Shell(display);
> > shell.setBounds(10,10,200,200);
> > TreeViewer tree = new TreeViewer(shell,SWT.NONE);
> > tree.getTree().setBounds(10,10,140,140);
> > tree.setLabelProvider(new ILabelProvider() {
> > public Image getImage(Object element) {
> > Image image = new Image (display, 16, 16);
> > int random = (int)System.currentTimeMillis() % 2;
> > Color color;
> > if (random == 0) {
> > color = display.getSystemColor (SWT.COLOR_RED);
> > } else {
> > color = display.getSystemColor (SWT.COLOR_BLUE);
> > }
> > GC gc = new GC (image);
> > gc.setBackground (color);
> > gc.fillOval (1, 1, 14, 14);
> > gc.dispose ();
> > return image;
> > }
> > public String getText(Object element) {
> > return "node";
> > }
> > public void addListener(ILabelProviderListener listener) {}
> > public void dispose() {}
> > public boolean isLabelProperty(Object element, String property) {
> > return false;
> > }
> > public void removeListener(ILabelProviderListener listener) {}
> > });
> > tree.setContentProvider(new ITreeContentProvider() {
> > public Object[] getChildren(Object parentElement) {return null;}
> > public Object getParent(Object element) {return null;}
> > public boolean hasChildren(Object element) {return true;}
> > public Object[] getElements(Object inputElement) {
> > return new String[] {"",""};
> > }
> > public void dispose() {}
> > public void inputChanged(Viewer viewer, Object oldInput, Object
> > newInput) {}
> > });
> > tree.setInput("");
> > shell.pack ();
> > shell.open ();
> > while (!shell.isDisposed ()) {
> > if (!display.readAndDispatch ()) display.sleep ();
> > }
> > display.dispose ();
> > }
> >
> > Grant
> >
> >
> >
> > Angel Shishkov wrote:
> >
> > > Hello,
> >
> > > I would like to dynamically generate the labels for a Tree.  The
labels
> must
> > > be circles with varying colors.  I don't have the labels as images in
a
> > > file, so I need to create the Image dynamically in the code.  This is
> what
> > > I've tried:
> >
> > > Image label = new Image(null, 15, 15);
> > > GC gc = new GC (label);
> > > gc.setBackground(ColorConstants.blue);
> > > gc.fillOval(0, 0, 15, 15);
> > > return label;
> >
> > > However, the labels that get displayed by this are just black squares.
> I
> > > have also tried:
> >
> > > Image label = new Image(Display.getCurrent(), 15, 15);
> >
> > > with the same effect.
> >
> > > I have tried this with both a JFace TreeViewer by implementing the
> > > LabelProvider and an SWT Tree widget by using TreeItem.setImage(img);
> Both
> > > methods produce a tree with black squares for labels.
> >
> > > Is this the correct way to draw to a GC?  Am I missing something?
> >
> > > Any help is greatly appreciated. Thanks!
> >
> > > Angel
> >
> >
> >
> >
> >
> >
>
>