I have a SWT Scale widget, and I need to add labels to the ticks on the scale.
Is there a way to do this? maybe on a Slider widget?
Thanks
This might be not exactly what you are asking, but you could incorporate a Text widget beside the Scale widget, responding to your Scale values.
For instance:
final Scale scale = new Scale(shell, SWT.HORIZONTAL);
scaleValue = new Text(shell, SWT.SINGLE | SWT.BORDER);
//scale properties omitted...
scale.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
int perspectivevalue = scale.getSelection();
scaleValue.setText("" + (perspectivevalue));
}
});
This has the effect of updating the value in the Text widget given whatever you drag the Scale slider to.
Related
I want to Auto - Resize NatTable dynamically according to the number of rows.
In other words, I have a nattable of height 'x' with 10 rows. If rows are less than 10 then the height of nattable should reduce, so that empty space cannot be seen. If number of rows exceeds 10, vertical scroll bar should come.
That is a SWT layout question in the end. Basically you are asking for a way to specify a minimum height based on the table content. You could solve this with a GridLayout and a resize listener that updates the minimum height dependent on the available container height.
Composite panel = new Composite(parent, SWT.NONE);
panel.setLayout(new GridLayout());
NatTable natTable = new NatTable(panel);
// minimum height of NatTable + scrollbar
int minHeight = natTable.getPreferredHeight() + 18;
GridDataFactory
.swtDefaults()
.align(SWT.FILL, SWT.BEGINNING)
.grab(true, true)
.minSize(SWT.DEFAULT, minHeight)
.applyTo(natTable);
panel.addListener(SWT.Resize, new Listener() {
#Override
public void handleEvent(Event event) {
GridData data = ((GridData) natTable.getLayoutData());
// minHeight + 10 because of the margins
if (panel.getBounds().height < (minHeight + 10)) {
data.minimumHeight = SWT.DEFAULT;
data.verticalAlignment = SWT.FILL;
} else {
data.minimumHeight = minHeight;
data.verticalAlignment = SWT.BEGINNING;
}
}
});
Note that this is just one solution for this. There might be more elegant ones dependent on the layout you are using.
My Goal is to have a Button with a background image and ontop of these a Label.
I want to position the label in the centre of the button and vertically allign it's text. I want the button to expand in propotion to the number of characters in the label. What is the best type of panel to use to build this type of composite widget as I am running into problems with using an AbsolutePanel as it doesn't dynamically grow with it's child elements.
private PushButton button;
private Label label = new Label();
private AbsolutePanel panel = new AbsolutePanel();
private Image image = new Image("images/rectangle_blue.png");
public ExpandingRectangularButton(String text)
{
label.setText(text);
String width = "120px";
String height = "160px";
image.setWidth(width);
image.setHeight(height);
button = new PushButton(image);
panel.add(button, 0, 0);
panel.setWidth(width);
panel.setHeight(height);
initWidget( panel );
}
What is the best type of panel to use in this case? I have tried flow, horizontal and flextables but I can't get these to stack widgets on top of each other correctly
FlowPanel??.
A FlowPanel arranges components in a directional flow, much like lines of text in a paragraph.
I am writing a tile based platform game. At the moment I am trying to get 400 tiles to display at once. This is my panel. On the top and left sides everything is working great but on the right and bottom sides the images are cut off by a few pixels. Each image is 32*32. All of blocks are initialized. None are null. What is wrong here?
public class Pane extends JPanel implements ActionListener{
private static final long serialVersionUID = 1L;
Timer timer;
boolean setup = false;
Block[][] blocks;
Level level;
public Pane()
{
level = new Level();
level.Generate();
blocks = level.Parse();
setBackground(Color.WHITE);
timer = new Timer(25, this);
timer.start();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
for(Block[] b : blocks)
{
for(Block bx : b)
{
// Debug code if(bx.letter.equals("D"))
// Debug codeSystem.out.println(bx.y*32 +" = "+ bx.x*32);
g2d.drawImage(bx.bpic, bx.x*32, bx.y*32, this);
}
}
Toolkit.getDefaultToolkit().sync();
g.dispose();
}
#Override
public void actionPerformed(ActionEvent e) {
repaint();
}
}
on the right and bottom sides the images are cut off by a few pixels
If you mean the right and bottom sides of the whole panel (not on the single tiles), than it's probably a LayoutManager related problem. The solution depends on the layout manager you are using for the component your JPanel will be added to.
You could try to specify the minimum/preferred size of your JPanel with:
Pane pane = new Pane();
pane.setPreferredSize(...);
pane.setMinimumSize(...);
In order to specify its minimum dimension accordingly to the size of the generated image (32 * COL , 32 * ROW).
Unfortunately the effectiveness of the setPreferredSize call depends on the layout manager of your Pane parent component.
JComponent can do that basically and can return very easily something as MinimumSize or PreferredSize, valid for majority of standard Swing LayoutManagers, examples here.
My purpose is to draw in the CENTER of the composite. Actually, I have an rcp view and I'm drawing some shapes inside it. this is the code that I use :
display = parent.getDisplay();
white= display.getSystemColor(SWT.COLOR_WHITE);
parent.setLayout(new FillLayout(SWT.VERTICAL));
// Create the ScrolledComposite to scroll horizontally and vertically
final ScrolledComposite sc =new ScrolledComposite(parent, SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
sc.setExpandHorizontal(true);
sc.setExpandVertical(true);
sc.setMinHeight(100);
sc.setMinWidth(100);
sc.setSize(100,100);
Composite child = new Composite(sc,SWT.NONE);
child.setLayout(new FillLayout());
child.layout(true);
parent.addListener (SWT.Resize, new Listener () {
public void handleEvent (Event e) {
x = child.getBounds().width/2;
y = child.getBounds().height/2;
child.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent event) {
dessin(gc); // to raw the circle
}
});
sc.getDisplay().update();
}
});
I defined the view with a ratio (so when the view is empty I get the wanted size)...I don't know the exact size of the view since it can be resized by the user at anymoment, or when an editor is opened... So, my problem is how to draw just in the center of the view and keep the drawings in the center even if the view is resized...
PS: Using (Point.x and point.y), I get (0,0) when the view appears first, then I get other values...
Pleaaaaaaaaaaaaaase help
You can use getOrigin() method on ScrolledComposite, which will return Point instance with the point in the content that currently appears in the top left corner of the scrolled composite. See docs getOrigin method on ScrolledComposite.
With that information and size of the component which you'll get from getBounds() method you can easily calculate the 'real' center.
I've been trying to create a Draw2D Figure that consists of two parts - a central resizeable shape, such as a circle or rectangle, and an editable label for the bottom part. An example of this type of figure is the icon/label you see on a computer's Desktop.
The first attempt was to create a parent container figure with two child sub-figures - a shape figure placed centrally and a label placed at the bottom. It also implemented HandleBounds so that selection and resizing occurs only on the upper shape sub-figure. This turned out not to be a working solution because as the label gets wider with more text so does the main parent figure and consequently the central shape figure. In other words the overall parent figure is as wide as the child label figure.
What I'm seeking is a Figure that maintains the size of the shape figure but allows the width of the label figure to grow independently. Exactly the same behaviour as a desktop icon.
Ok I get your question right now. It's impossible to do what you want:
The parent figure can't be smaller than one of its children or this child will not be visible !!!
You have to create a container figure as you mentioned with an XYLayout and "manually" place and "size" the 2 (the shape and the label) children figure inside this layout using the IFigure.add(IFigure child, Object constraint) method with a Constraint of type Rectangle (Draw2d)
Edit with code sample
Here is an example of what your figure class could look like:
package draw2dtest.views;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Ellipse;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.FigureListener;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.Label;
import org.eclipse.draw2d.MouseEvent;
import org.eclipse.draw2d.MouseListener;
import org.eclipse.draw2d.XYLayout;
import org.eclipse.draw2d.geometry.Rectangle;
public class LabeledFigure extends Figure {
private final Figure shapeFigure;
private final Label labelFigure;
private Rectangle customShapeConstraint;
public LabeledFigure(String label) {
setLayoutManager(new XYLayout());
setBackgroundColor(ColorConstants.lightGray);
setOpaque(true);
shapeFigure = new Ellipse();
this.add(shapeFigure);
shapeFigure.setBackgroundColor(ColorConstants.yellow);
shapeFigure.addMouseListener(new MouseListener.Stub() {
#Override
public void mousePressed(MouseEvent me) {
customShapeConstraint = new Rectangle(
(Rectangle) LabeledFigure.this.getLayoutManager()
.getConstraint(shapeFigure));
customShapeConstraint.width -= 6;
customShapeConstraint.x += 3;
LabeledFigure.this.getLayoutManager().setConstraint(
shapeFigure, customShapeConstraint);
LabeledFigure.this.revalidate();
}
});
labelFigure = new Label(label);
labelFigure.setOpaque(true);
labelFigure.setBackgroundColor(ColorConstants.green);
labelFigure.addMouseListener(new MouseListener.Stub() {
#Override
public void mousePressed(MouseEvent me) {
Rectangle shapeFigureConstraint = new Rectangle(0, 0,
bounds.width, bounds.height - 15);
LabeledFigure.this.getLayoutManager().setConstraint(
shapeFigure, shapeFigureConstraint);
LabeledFigure.this.revalidate();
}
});
this.add(labelFigure);
this.addFigureListener(new FigureListener() {
#Override
public void figureMoved(IFigure source) {
Rectangle bounds = LabeledFigure.this.getBounds();
Rectangle shapeFigureConstraint = new Rectangle(0, 0,
bounds.width, bounds.height - 15);
LabeledFigure.this.getLayoutManager().setConstraint(
shapeFigure, shapeFigureConstraint);
Rectangle labelFigureConstraint = new Rectangle(0,
bounds.height - 15, bounds.width, 15);
if (customShapeConstraint != null) {
labelFigureConstraint = customShapeConstraint;
}
LabeledFigure.this.getLayoutManager().setConstraint(
labelFigure, labelFigureConstraint);
}
});
}
}
This is not a clean class but it should be a good entry to show you how to achieve your goal. This is an example based on pure Draw2d without any Gef code, thus the resizing of the shape is done by clicking in the yellow Ellipse (the size is decreased) and on the green label (the initial size is restored)
To test this class I created a simple Eclipse view as following:
#Override
public void createPartControl(Composite parent) {
FigureCanvas fc = new FigureCanvas(parent, SWT.DOUBLE_BUFFERED);
fc.setBackground(ColorConstants.red);
Panel panel = new Panel();
panel.setLayoutManager(new XYLayout());
LabeledFigure labeledFigure = new LabeledFigure("This is the label");
fc.setContents(panel);
panel.add(labeledFigure, new Rectangle(10,10, 200,100));
}
Hope this can help,
Manu