Java tutorial
/** * Copyright (c) 2005-2013 by Appcelerator, Inc. All Rights Reserved. * Licensed under the terms of the Eclipse Public License (EPL). * Please see the license.txt included with this distribution for details. * Any modifications to this file must keep this entire header intact. */ package org.python.pydev.ui.dialogs; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.python.pydev.shared_core.structure.Tuple; /** * @author raul * @author fabioz */ public abstract class AbstractKeyValueDialog extends Dialog { /** * The title of the dialog. */ protected String title; /** * The message to display, or <code>null</code> if none. */ protected String message; /** * Ok button widget. */ protected Button okButton; /** * Error message label widget. */ protected Text errorMessageText; /** * Input text widget. */ protected Text keyField; /** * Input text widget. */ protected Text valueField; /** * The interpreter name input value */ protected String finalKeyValue = null; /** * The interpreter executable input value */ protected String finalValueValue = null; /** * Button id for an "Browser" button (value 64). */ public int BROWSER_ID = 64; /** * Button browser label */ public String BROWSER_LABEL = "Brows&e..."; /** * Browser button widget. */ protected Button browserButton; protected Listener changesValidator; /* * (non-Javadoc) Method declared on Dialog. */ protected void buttonPressed(int buttonId) { if (buttonId == IDialogConstants.OK_ID) { finalKeyValue = keyField.getText().trim(); //Getting the absolute PATH here because we cannot work with links! finalValueValue = valueField.getText().trim(); } else { finalKeyValue = null; finalValueValue = null; } super.buttonPressed(buttonId); } public AbstractKeyValueDialog(Shell shell, String dialogTitle, String dialogMessage) { super(shell); this.title = dialogTitle; this.message = dialogMessage; } /* * (non-Javadoc) * * @see org.eclipse.jface.window.Window#configureShell(org.eclipse.swt.widgets.Shell) */ protected void configureShell(Shell shell) { super.configureShell(shell); if (title != null) shell.setText(title); } /** * Sets or clears the error message. * If not <code>null</code>, the OK button is disabled. * * @param errorMessage * the error message, or <code>null</code> to clear */ public void setErrorMessage(String errorMessage) { errorMessageText.setText(errorMessage == null ? "" : errorMessage); //$NON-NLS-1$ okButton.setEnabled(errorMessage == null); errorMessageText.getParent().update(); } /* * (non-Javadoc) Method declared on Dialog. */ protected Control createDialogArea(Composite parent) { Composite main = new Composite(parent, SWT.NONE); GridLayout layout = new GridLayout(); layout.numColumns = 3; main.setLayout(layout); main.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); GridData data = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL); // create message if (message != null) { Label messageLabel = new Label(main, SWT.WRAP); messageLabel.setText(message); data = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL); data.horizontalSpan = 3; data.widthHint = 150; messageLabel.setLayoutData(data); } Label separator = new Label(main, SWT.NONE); data = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL); data.horizontalSpan = 4; separator.setText(""); separator.setLayoutData(data); createFields(main); errorMessageText = new Text(main, SWT.READ_ONLY); errorMessageText.setBackground(errorMessageText.getDisplay().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); errorMessageText.setForeground(errorMessageText.getDisplay().getSystemColor(SWT.COLOR_RED)); data = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL); data.horizontalSpan = 3; data.widthHint = 150; errorMessageText.setLayoutData(data); applyDialogFont(main); return main; } /* * (non-Javadoc) * * @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite) */ protected void createButtonsForButtonBar(Composite parent) { // create OK and Cancel buttons by default okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); setErrorMessage(getInitialMessage()); } /** * Creates the three widgets that represent the password entry area. * @param parent the parent of the widgets, which has two columns */ protected void createFields(Composite parent) { changesValidator = createChangesValidator(); new Label(parent, SWT.NONE).setText(getKeyLabelText()); keyField = new Text(parent, SWT.BORDER); GridData data = new GridData(GridData.FILL_HORIZONTAL); data.horizontalSpan = 3; data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH); keyField.setLayoutData(data); keyField.addListener(SWT.SELECTED, changesValidator); keyField.addListener(SWT.KeyDown, changesValidator); keyField.addListener(SWT.KeyUp, changesValidator); new Label(parent, SWT.NONE).setText(getValueLabelText()); valueField = new Text(parent, SWT.BORDER); data = new GridData(GridData.FILL_HORIZONTAL); data.horizontalSpan = 2; data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH); valueField.setLayoutData(data); valueField.addListener(SWT.SELECTED, changesValidator); valueField.addListener(SWT.KeyDown, changesValidator); valueField.addListener(SWT.KeyUp, changesValidator); browserButton = createButton(parent, BROWSER_ID, BROWSER_LABEL, true); data = new GridData(GridData.FILL_HORIZONTAL); data.horizontalSpan = 1; data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH); browserButton.setLayoutData(data); browserButton.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent evt) { String file = handleBrowseButton(); if (file != null) { file = file.trim(); setValueField(file); } changesValidator.handleEvent(null); //Make it update the error message } }); } protected void setValueField(String value) { valueField.setText(value); } /** * Return the key/value inserted by the user. * * @return the key/value inserted by the user or <code>null</code> if user canceled */ public Tuple<String, String> getKeyAndValueEntered() { if (finalKeyValue == null || finalValueValue == null || finalKeyValue.trim().length() == 0 || finalValueValue.trim().length() == 0) { return null; } return new Tuple<String, String>(finalKeyValue.trim(), finalValueValue.trim()); } protected abstract String handleBrowseButton(); protected abstract String getValueLabelText(); protected abstract String getKeyLabelText(); protected abstract Listener createChangesValidator(); protected abstract String getInitialMessage(); }