swt中改变树的字体及颜色的实现

package org.eclipse.jface.snippets.viewers1; import org.eclipse.jface.resource.FontRegistry; import org.eclipse.jface.viewers.ITableColorProvider; import org.eclipse.jface.viewers.ITableFontProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.TreeColumn; /** * A simple TreeViewer to demonstrate usage * * @author Tom Schindl <tom.schindl@bestsolution.at> * */ public class Snippet014TreeViewerNoneMandatoryLabelProvider { private class MyContentProvider implements ITreeContentProvider { /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) */ public Object[] getElements(Object inputElement) { return ((MyModel) inputElement).child.toArray(); } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IContentProvider#dispose() */ public void dispose() { } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, * java.lang.Object, java.lang.Object) */ public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object) */ public Object[] getChildren(Object parentElement) { return getElements(parentElement); } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object) */ public Object getParent(Object element) { if (element == null) { return null; } return ((MyModel) element).parent; } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object) */ public boolean hasChildren(Object element) { return ((MyModel) element).child.size() > 0; } } public Snippet014TreeViewerNoneMandatoryLabelProvider(Shell shell) { final TreeViewer v = new TreeViewer(shell); TreeColumn column = new TreeColumn(v.getTree(),SWT.NONE); column.setWidth(200); column.setText("Column 1"); column = new TreeColumn(v.getTree(),SWT.NONE); column.setWidth(200); column.setText("Column 2"); v.setLabelProvider(new MyLabelProvider()); v.setContentProvider(new MyContentProvider()); v.setInput(createModel()); } private MyModel createModel() { MyModel root = new MyModel(0, null); root.counter = 0; MyModel tmp; for (int i = 1; i < 10; i++) { tmp = new MyModel(i, root); root.child.add(tmp); for (int j = 1; j < i; j++) { tmp.child.add(new MyModel(j, tmp)); } } return root; } public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet014TreeViewerNoneMandatoryLabelProvider(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } }  

package org.eclipse.jface.snippets.viewers1; import java.util.ArrayList; public class MyModel { public MyModel parent; public ArrayList child = new ArrayList(); public int counter; public MyModel(int counter, MyModel parent) { this.parent = parent; this.counter = counter; } public String toString() { String rv = "Item "; if (parent != null) { rv = parent.toString() +"."; } rv += counter; return rv; } }  

package org.eclipse.jface.snippets.viewers1; import org.eclipse.jface.resource.FontRegistry; import org.eclipse.jface.viewers.ITableColorProvider; import org.eclipse.jface.viewers.ITableFontProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.widgets.Display; public class MyLabelProvider extends LabelProvider implements ITableLabelProvider, ITableFontProvider, ITableColorProvider { FontRegistry registry = new FontRegistry(); public Image getColumnImage(Object element, int columnIndex) { return null; } public String getColumnText(Object element, int columnIndex) { return "Column " + columnIndex + " => " + element.toString(); } public Font getFont(Object element, int columnIndex) { if (((MyModel) element).counter % 2 == 0) { return registry.getBold(Display.getCurrent().getSystemFont() .getFontData()[0].getName()); } return null; } public Color getBackground(Object element, int columnIndex) { if (((MyModel) element).counter % 2 == 0) { return Display.getCurrent().getSystemColor(SWT.COLOR_RED); } return Display.getCurrent().getSystemColor(SWT.COLOR_BLUE); } public Color getForeground(Object element, int columnIndex) { if (((MyModel) element).counter % 2 == 1) { return Display.getCurrent().getSystemColor(SWT.COLOR_RED); } return Display.getCurrent().getSystemColor(SWT.COLOR_BLUE); } }