Java tutorial
/******************************************************************************* * Copyright (c) 2007, 2009 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.ui.internal.views.markers; import org.eclipse.core.resources.IMarker; import org.eclipse.core.runtime.CoreException; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.CheckboxCellEditor; import org.eclipse.jface.viewers.ColumnViewer; import org.eclipse.jface.viewers.EditingSupport; import org.eclipse.jface.viewers.ViewerCell; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.ui.internal.ide.Policy; import org.eclipse.ui.views.markers.MarkerField; import org.eclipse.ui.views.markers.MarkerItem; /** * MarkerCompletionField is the class that specifies the completion entry. * * @since 3.4 * */ public class MarkerCompletionField extends MarkerField { private class CompletionEditingSupport extends EditingSupport { private CheckboxCellEditor editor; /** * Create a new instance of the receiver. * * @param viewer */ public CompletionEditingSupport(ColumnViewer viewer) { super(viewer); this.editor = new CheckboxCellEditor((Composite) viewer.getControl()); } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.EditingSupport#canEdit(java.lang.Object) */ protected boolean canEdit(Object element) { if (element instanceof MarkerEntry) return ((MarkerEntry) element).getAttributeValue(IMarker.USER_EDITABLE, false); return false; } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.EditingSupport#getCellEditor(java.lang.Object) */ protected CellEditor getCellEditor(Object element) { return editor; } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.EditingSupport#getValue(java.lang.Object) */ protected Object getValue(Object element) { return new Boolean(((MarkerEntry) element).getAttributeValue(IMarker.DONE, false)); } /* * (non-Javadoc) * * @see org.eclipse.jface.viewers.EditingSupport#setValue(java.lang.Object, * java.lang.Object) */ protected void setValue(Object element, Object value) { MarkerEntry entry = (MarkerEntry) element; Boolean booleanValue = (Boolean) value; try { entry.getMarker().setAttribute(IMarker.DONE, booleanValue.booleanValue()); } catch (CoreException e) { Policy.handle(e); } } } static final String COMPLETE_IMAGE_PATH = "$nl$/icons/full/obj16/complete_tsk.gif"; //$NON-NLS-1$ static final String INCOMPLETE_IMAGE_PATH = "$nl$/icons/full/obj16/incomplete_tsk.gif"; //$NON-NLS-1$ private static final int DONE = 2; private static final int NOT_DONE = 1; private static final int UNDEFINED = 0; /** * Create a new instance of the receiver. */ public MarkerCompletionField() { super(); } /* * (non-Javadoc) * * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerField#compare(org.eclipse.ui.internal.provisional.views.markers.api.MarkerItem, * org.eclipse.ui.internal.provisional.views.markers.api.MarkerItem) */ public int compare(MarkerItem item1, MarkerItem item2) { return getDoneConstant(item2) - getDoneConstant(item1); } /* * (non-Javadoc) * * @see org.eclipse.ui.internal.provisional.views.markers.MarkerField#getColumnHeaderText() */ public String getColumnHeaderText() { return MarkerSupportInternalUtilities.EMPTY_STRING; } /* * (non-Javadoc) * * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerField#getColumnTooltipText() */ public String getColumnTooltipText() { return getName(); } /** * Return the image for task completion. * * @return Image */ private Image getCompleteImage() { return MarkerSupportInternalUtilities.createImage(COMPLETE_IMAGE_PATH, getImageManager()); } /* * (non-Javadoc) * * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerField#getDefaultColumnWidth(org.eclipse.swt.widgets.Control) */ public int getDefaultColumnWidth(Control control) { return 40; } /** * Return the constant that indicates whether or not the receiver is done * * @param item * @return 1 if it is done, 0 if it not and -1 if it cannot be determined. */ private int getDoneConstant(MarkerItem item) { int done = UNDEFINED; if (item.getMarker() != null && item.getAttributeValue(IMarker.USER_EDITABLE, true)) { done = NOT_DONE; if (item.getAttributeValue(IMarker.DONE, false)) { done = DONE; } } return done; } /* * (non-Javadoc) * * @see org.eclipse.ui.internal.provisional.views.markers.api.MarkerField#getEditingSupport(org.eclipse.jface.viewers.ColumnViewer) */ public EditingSupport getEditingSupport(ColumnViewer viewer) { return new CompletionEditingSupport(viewer); } /** * Get the image for item. * * @param element * @return Image */ private Image getImage(Object element) { switch (getDoneConstant((MarkerItem) element)) { case DONE: return getCompleteImage(); case NOT_DONE: return MarkerSupportInternalUtilities.createImage(INCOMPLETE_IMAGE_PATH, getImageManager()); default: return null; } } /* * (non-Javadoc) * * @see org.eclipse.ui.internal.provisional.views.markers.MarkerField#getValue(org.eclipse.ui.internal.provisional.views.markers.MarkerItem) */ public String getValue(MarkerItem item) { return MarkerSupportInternalUtilities.EMPTY_STRING; } /* * (non-Javadoc) * * @see org.eclipse.ui.views.markers.MarkerField#update(org.eclipse.jface.viewers.ViewerCell) */ public void update(ViewerCell cell) { super.update(cell); cell.setImage(getImage(cell.getElement())); } }