Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2011 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.debug.internal.ui.actions.variables.details; import org.eclipse.debug.internal.core.IInternalDebugCoreConstants; import org.eclipse.debug.internal.ui.DebugUIPlugin; import org.eclipse.debug.internal.ui.IDebugHelpContextIds; import org.eclipse.debug.internal.ui.views.variables.VariablesViewMessages; import org.eclipse.debug.ui.IDebugUIConstants; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.dialogs.IInputValidator; import org.eclipse.jface.dialogs.TrayDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.PlatformUI; /** * Provides a dialog for changing the maximum length allowed in the detail pane * * @since 3.0 */ public class DetailPaneMaxLengthDialog extends TrayDialog { private static final String SETTINGS_ID = DebugUIPlugin.getUniqueIdentifier() + ".MAX_DETAILS_LENGTH_DIALOG"; //$NON-NLS-1$ private Text fTextWidget; private Text fErrorTextWidget; private String fErrorMessage; private String fValue; private IInputValidator fValidator; /** * Constructs a new dialog on the given shell. * * @param parent shell */ public DetailPaneMaxLengthDialog(Shell parent) { super(parent); setShellStyle(getShellStyle() | SWT.RESIZE); fValue = Integer.toString( DebugUIPlugin.getDefault().getPreferenceStore().getInt(IDebugUIConstants.PREF_MAX_DETAIL_LENGTH)); fValidator = new IInputValidator() { public String isValid(String newText) { try { int num = Integer.parseInt(newText); if (num < 0) { return VariablesViewMessages.DetailPaneMaxLengthDialog_2; } } catch (NumberFormatException e) { return VariablesViewMessages.DetailPaneMaxLengthDialog_3; } return null; } }; } /* (non-Javadoc) * @see org.eclipse.ui.dialogs.SelectionDialog#getDialogBoundsSettings() */ protected IDialogSettings getDialogBoundsSettings() { IDialogSettings settings = DebugUIPlugin.getDefault().getDialogSettings(); IDialogSettings section = settings.getSection(SETTINGS_ID); if (section == null) { section = settings.addNewSection(SETTINGS_ID); } return section; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#createContents(org.eclipse.swt.widgets.Composite) */ protected Control createContents(Composite parent) { getShell().setText(VariablesViewMessages.DetailPaneMaxLengthDialog_0); Control contents = super.createContents(parent); PlatformUI.getWorkbench().getHelpSystem().setHelp(getDialogArea(), IDebugHelpContextIds.DETAIL_PANE_MAX_LENGTH_ACTION); return contents; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite) */ protected Control createDialogArea(Composite parent) { Composite composite = (Composite) super.createDialogArea(parent); Label label = new Label(composite, SWT.WRAP); label.setText(VariablesViewMessages.DetailPaneMaxLengthDialog_1); GridData data = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH); label.setLayoutData(data); label.setFont(parent.getFont()); fTextWidget = new Text(composite, SWT.SINGLE | SWT.BORDER); fTextWidget.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); fTextWidget.setText(fValue); fTextWidget.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { validateInput(); fValue = fTextWidget.getText(); } }); fErrorTextWidget = new Text(composite, SWT.READ_ONLY); fErrorTextWidget.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL)); fErrorTextWidget.setBackground(fErrorTextWidget.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); setErrorMessage(fErrorMessage); applyDialogFont(composite); return composite; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.Dialog#okPressed() */ protected void okPressed() { String text = getValue(); try { DebugUIPlugin.getDefault().getPreferenceStore().setValue(IDebugUIConstants.PREF_MAX_DETAIL_LENGTH, Integer.parseInt(text)); } catch (NumberFormatException e) { DebugUIPlugin.log(e); } super.okPressed(); } /** * Returns the string typed into this input dialog. * * @return the input string * @since 3.3 */ public String getValue() { return fValue; } /** * Validates the current input * @since 3.3 */ private void validateInput() { String errorMessage = null; if (fValidator != null) { errorMessage = fValidator.isValid(fTextWidget.getText()); } setErrorMessage(errorMessage); } /** * Sets the current error message or none if null * @param errorMessage the message to display * @since 3.3 */ public void setErrorMessage(String errorMessage) { fErrorMessage = errorMessage; if (fErrorTextWidget != null && !fErrorTextWidget.isDisposed()) { fErrorTextWidget .setText(errorMessage == null ? IInternalDebugCoreConstants.EMPTY_STRING : errorMessage); fErrorTextWidget.getParent().update(); // Access the ok button by id, in case clients have overridden button creation. // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=113643 Control button = getButton(IDialogConstants.OK_ID); if (button != null) { button.setEnabled(errorMessage == null); } } } }