Java tutorial
/******************************************************************************* * Copyright (c) 2011-2013 EclipseSource Muenchen GmbH 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: * Eugen Neufeld - initial API and implementation * Edgar Mueller - refactored control to respect locale settings * *******************************************************************************/ package org.eclipse.emf.ecp.edit.internal.swt.controls; import java.text.DecimalFormat; import java.text.ParseException; import java.text.ParsePosition; import org.eclipse.core.databinding.Binding; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.core.databinding.observable.value.IValueChangeListener; import org.eclipse.core.databinding.observable.value.ValueChangeEvent; import org.eclipse.emf.ecp.edit.internal.swt.Activator; import org.eclipse.emf.ecp.edit.spi.swt.util.ECPDialogExecutor; import org.eclipse.emf.edit.command.SetCommand; import org.eclipse.emfforms.spi.localization.LocalizationServiceHelper; import org.eclipse.jface.databinding.swt.SWTObservables; import org.eclipse.jface.dialogs.IDialogLabelKeys; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Text; /** * This class is used as a common class for all number controls. * * @author Eugen Neufeld * @author emueller */ @Deprecated public class NumericalControl extends AbstractTextControl { @Override protected int getTextWidgetStyle() { return super.getTextWidgetStyle() | SWT.RIGHT; } /* * (non-Javadoc) * @see org.eclipse.emf.ecp.edit.internal.swt.controls.AbstractTextControl#getTextVariantID() */ @Override protected String getTextVariantID() { return "org_eclipse_emf_ecp_control_numerical"; //$NON-NLS-1$ } /* * (non-Javadoc) * @see org.eclipse.emf.ecp.edit.internal.swt.controls.SingleControl#getUnsetLabelText() */ @Override protected String getUnsetLabelText() { return LocalizationServiceHelper.getString(getClass(), DepricatedControlMessageKeys.NumericalControl_NoNumberClickToSetNumber); } /* * (non-Javadoc) * @see org.eclipse.emf.ecp.edit.internal.swt.controls.SingleControl#getUnsetButtonTooltip() */ @Override protected String getUnsetButtonTooltip() { return LocalizationServiceHelper.getString(getClass(), DepricatedControlMessageKeys.NumericalControl_UnsetNumber); } @Override protected void customizeText(Text text) { super.customizeText(text); text.setMessage(getFormatText()); } /* * (non-Javadoc) * @see org.eclipse.emf.ecp.edit.internal.swt.controls.AbstractTextControl#bindValue() */ @Override public Binding bindValue() { // TODO: FocusOut doesn't seem to fire in case the same invalid text is entered twice final IObservableValue value = SWTObservables.observeText(getText(), SWT.FocusOut); final NumericalTargetToModelUpdateStrategy targetToModelStrategy = new NumericalTargetToModelUpdateStrategy(); final NumericalModelToTargetUpdateStrategy modelToTargetStrategy = new NumericalModelToTargetUpdateStrategy(); final Binding binding = getDataBindingContext().bindValue(value, getModelValue(), targetToModelStrategy, modelToTargetStrategy); createTooltipBinding(targetToModelStrategy, modelToTargetStrategy); if (isEmbedded()) { // focus out is not fired if control is embedded; // use value change listener to get same behavior for control value.addValueChangeListener(new IValueChangeListener() { @Override public void handleValueChange(ValueChangeEvent event) { final Object newValue = event.diff.getNewValue(); final DecimalFormat format = NumericalHelper.setupFormat(getLocale(), getInstanceClass()); try { final Number number = format.parse((String) newValue); value.setValue(format.format(number)); binding.updateTargetToModel(); } catch (final ParseException ex) { targetToModelStrategy.revertToOldValue(value); } } }); } return binding; } private Class<?> getInstanceClass() { return getFirstStructuralFeature().getEType().getInstanceClass(); } private String getFormatText() { if (NumericalHelper.isInteger(getInstanceClass())) { return LocalizationServiceHelper.getString(getClass(), DepricatedControlMessageKeys.NumericalControl_FormatNumerical); } else if (NumericalHelper.isDouble(getInstanceClass())) { return LocalizationServiceHelper.getString(getClass(), DepricatedControlMessageKeys.NumericalControl_FormatNumericalDecimal); } return ""; //$NON-NLS-1$ } /** * Converts the numerical value from the model to the target. Locale settings are respected, * i.e. formatting is performed according to the current locale. */ private class NumericalModelToTargetUpdateStrategy extends ModelToTargetUpdateStrategy { @Override public Object convertValue(Object value) { if (value == null) { return ""; //$NON-NLS-1$ } final DecimalFormat format = NumericalHelper.setupFormat(getLocale(), getInstanceClass()); return format.format(value); } } /** * More specific target to model update strategy that convert the string * in the text field to a number. If the string is a invalid number, * for instance because of the current locale, the value is reset to * the last valid value found in the mode. */ private class NumericalTargetToModelUpdateStrategy extends TargetToModelUpdateStrategy { private final DecimalFormat format; NumericalTargetToModelUpdateStrategy() { super(); format = NumericalHelper.setupFormat(getLocale(), getInstanceClass()); } @Override protected Object convertValue(final Object value) { try { Number number = null; if (value == null) { number = NumericalHelper.getDefaultValue(getInstanceClass()); } else { final ParsePosition pp = new ParsePosition(0); number = format.parse((String) value, pp); if (pp.getErrorIndex() != -1 || pp.getIndex() != ((String) value).length()) { return revertToOldValue(value); } if (NumericalHelper.isInteger(getInstanceClass())) { boolean maxValue = false; final Class<?> instanceClass = getInstanceClass(); String formatedValue = ""; //$NON-NLS-1$ try { if (Integer.class.isAssignableFrom(instanceClass) || Integer.class.getField("TYPE").get(null).equals(instanceClass)) { //$NON-NLS-1$ if (Integer.MAX_VALUE == number.intValue()) { maxValue = true; formatedValue = format.format(Integer.MAX_VALUE); } } else if (Long.class.isAssignableFrom(instanceClass) || Long.class.getField("TYPE").get(null).equals(instanceClass)) { //$NON-NLS-1$ if (Long.MAX_VALUE == number.longValue()) { maxValue = true; formatedValue = format.format(Long.MAX_VALUE); } } } catch (final IllegalArgumentException ex) { Activator.logException(ex); } catch (final SecurityException ex) { Activator.logException(ex); } catch (final IllegalAccessException ex) { Activator.logException(ex); } catch (final NoSuchFieldException ex) { Activator.logException(ex); } if (maxValue) { getText().setText(formatedValue); return NumericalHelper.numberToInstanceClass(number, getInstanceClass()); } } } String formatedNumber = ""; //$NON-NLS-1$ if (number != null) { formatedNumber = format.format(number); } // if (number.toString().contains("E") //$NON-NLS-1$ // || ((String) value).matches("0*" + formatedNumber + "\\" //$NON-NLS-1$ //$NON-NLS-2$ // + format.getDecimalFormatSymbols().getDecimalSeparator() + "?0*")) { //$NON-NLS-1$ // // } // return revertToOldValue(value); getText().setText(formatedNumber); if (formatedNumber.length() == 0) { return null; } return NumericalHelper.numberToInstanceClass(format.parse(formatedNumber), getInstanceClass()); } catch (final ParseException ex) { return revertToOldValue(value); } } private Object revertToOldValue(final Object value) { if (getFirstStructuralFeature().getDefaultValue() == null && (value == null || value.equals(""))) { //$NON-NLS-1$ return null; } final Object result = getModelValue().getValue(); final MessageDialog messageDialog = new MessageDialog(getText().getShell(), LocalizationServiceHelper .getString(getClass(), DepricatedControlMessageKeys.NumericalControl_InvalidNumber), null, LocalizationServiceHelper.getString(getClass(), DepricatedControlMessageKeys.NumericalControl_InvalidNumberWillBeUnset), MessageDialog.ERROR, new String[] { JFaceResources.getString(IDialogLabelKeys.OK_LABEL_KEY) }, 0); new ECPDialogExecutor(messageDialog) { @Override public void handleResult(int codeResult) { } }.execute(); if (result == null) { getText().setText(""); //$NON-NLS-1$ } else { getDataBindingContext().updateTargets(); } if (getFirstStructuralFeature().isUnsettable() && result == null) { showUnsetLabel(); return SetCommand.UNSET_VALUE; } return result; } } }