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204 GEF Figures
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TextFlow A figure for displaying a string of text across multiple lines Thumbnail A figure displaying an image at reduced size with the same aspect ratio as the original figure Triangle A figure rendering itself as a triangle
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2043 Complex Figures
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Next, figures must be created for each of the edit parts One approach is to build complex figures by composing simpler figures without creating any custom figures In other cases, it is more useful to create a specialized figure class for each edit part class to be rendered on the screen For the purposes of this example, we will use one approach with favorites item edit parts and the other with ResourceEditPart
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20431 Composing Figures
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Figures can have child figures, making it possible to build complex figures by assembling simpler ones Edit parts can directly compose figures by using IFigure s add(IFigure) method In addition, an edit part s figure is automatically a child of that edit part s parent figure In other words, since the FavoritesManagerEditPart has child edit parts which have figures, GEF automatically declares these figures as children of the figure of FavoritesManagerEditPart We would like to display our favorites items as rounded rectangles containing both text and image Draw2D provides RoundedRectangle and Label classes which we can compose as parent/child for this purpose Start by modifying BasicFavoriteItemEditPart to add a new field which will be referenced by multiple methods:
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private final Label label = new Label();
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Modify the constructor to initialize the label text and image based upon the favorite item s information:
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public BasicFavoriteItemEditPart(BasicFavoriteItem item) { setModel(item); labelsetText(itemgetName()); labelsetIcon(itemgetType()getImage()); IResource res = (IResource) itemgetAdapter(IResourceclass); modelSourceConnections = new ArrayList<FavoritesConnection>(1); modelSourceConnectionsadd(new FavoritesConnection(item, res)); }
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Now, implement the createFigure() method in BasicFavoriteItemEditPart to construct a rounded rectangle and add the label as a child centered within that rectangle The rectangle s client area must be inset to vertically center the label within the rectangle:
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CHAPTER 20 GEF: Graphical Editing Framework
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private static final Insets CLIENT_AREA_INSETS = new Insets(10, 10, 21, 21); protected IFigure createFigure() { RoundedRectangle figure = new RoundedRectangle() { public Rectangle getClientArea(Rectangle rect) { Rectangle clientArea = supergetClientArea(rect); clientAreacrop(CLIENT_AREA_INSETS); return clientArea; } }; figuresetSize(150, 40); FlowLayout layout = new FlowLayout(); layoutsetMajorAlignment(FlowLayoutALIGN_CENTER); layoutsetMinorAlignment(FlowLayoutALIGN_CENTER); figuresetLayoutManager(layout); labelsetTextAlignment(PositionConstantsLEFT); figureadd(label); return figure; }
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We would like to display resources as a rectangle with a folded corner containing the name of the resource Unfortunately, there is no such figure provided by Draw2D, so we must write our own For greater reuse, we could create a new FoldedCornerRectangle for use with a Label similar to the prior section Instead, for simplicity, we create a new ResourceFigure class to visually represent resources in our Favorites GEF View
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public class ResourceFigure extends Figure { private Label label; public ResourceFigure() { super(); label = new Label(); labelsetTextAlignment(PositionConstantsLEFT); add(label); setLayoutManager(new FreeformLayout()); } public void setText(String text) { labelsetText(text); } public void setImage(Image icon) { labelsetIcon(icon); } }
This class s paint() method draws the figure on the screen:
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private static final int FOLDED_CORNER_LENGTH = 12; protected void paintFigure(Graphics g) { superpaintFigure(g); Rectangle r = getClientArea();
// draw the rectangle without the top left corner gdrawLine(rx, ry, rx + rwidth - FOLDED_CORNER_LENGTH - 1, ry); // top gdrawLine(rx, ry, rx, ry + rheight - 1); // left gdrawLine(rx, ry + rheight - 1, rx + rwidth - 1, ry + rheight - 1); // bottom gdrawLine(rx + rwidth - 1, ry + FOLDED_CORNER_LENGTH - 1, rx + rwidth - 1, ry + rheight - 1); // right // draw the label setConstraint(label, new Rectangle(rx + 10, ry + 10, rwidth - 21, rheight - 21)); // draw the folded corner Point topLeftCorner, bottomLeftCorner, bottomRightCorner; PointList trianglePolygon; topLeftCorner = new Point(rx + rwidth - FOLDED_CORNER_LENGTH - 1, ry); bottomLeftCorner = new Point(rx + rwidth - FOLDED_CORNER_LENGTH - 1, ry + FOLDED_CORNER_LENGTH); bottomRightCorner = new Point(rx + rwidth - 1, ry + FOLDED_CORNER_LENGTH); trianglePolygon = new PointList(3); trianglePolygonaddPoint(topLeftCorner); trianglePolygonaddPoint(bottomLeftCorner); trianglePolygonaddPoint(bottomRightCorner); gsetBackgroundColor(ColorConstantslightGray); gfillPolygon(trianglePolygon); gdrawLine(topLeftCorner, bottomLeftCorner); gdrawLine(bottomLeftCorner, bottomRightCorner); gsetLineDash(new int[] { 1 }); gdrawLine(bottomRightCorner, topLeftCorner); }
Once the ResouceFigure class has been implemented, we must modify ResourceEditPart to instantiate and return this new figure Start by adding a new field to ResourceEditPart so that the figure can be referenced by multiple methods:
private final ResourceFigure resourceFigure = new ResourceFigure();
Modify the constructor to initialize the figure: