Java tutorial
/******************************************************************************* * Copyright (c) 2014 Rohde & Schwarz GmbH & Co. KG 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: * Martin Runge - initial implementation of cmake support *******************************************************************************/ package org.eclipse.cdt.cmake.ui; import java.io.File; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.preference.StringFieldEditor; import org.eclipse.core.runtime.Assert; import org.eclipse.debug.ui.StringVariableSelectionDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.DirectoryDialog; import org.eclipse.swt.widgets.Shell; /** * An abstract field editor for a string type preference that presents * a string input field with a change button to its right to edit the * input field's content. When the user presses the change button, the * abstract framework method <code>changePressed()</code> gets called * to compute a new string. */ public class DestdirFieldEditor extends StringFieldEditor { /** * The browse button */ private Button browseButton; /** * The text for the browse button */ private String browseButtonText; /** * The button to open the variables selection dialog */ private Button variablesButton; /** * The text for the variables selection button. */ private String variablesButtonText; /** * Creates a new destdir field editor. */ public DestdirFieldEditor() { } private File filterPath = null; /** * Creates a destdir field editor. * * @param name the name of the preference this field editor works on * @param labelText the label text of the field editor * @param parent the parent of the field editor's control */ public DestdirFieldEditor(String name, String labelText, Composite parent) { init(name, labelText); createControl(parent); } /* (non-Javadoc) * Method declared on FieldEditor. */ public void adjustForNumColumns(int numColumns) { ((GridData) getTextControl().getLayoutData()).horizontalSpan = numColumns - 3; } /** * Notifies that this field editor's browse button has been pressed. * * @return the new string to display, or <code>null</code> to leave the * old string showing */ public String browsePressed() { File f = new File(getTextControl().getText()); if (!f.exists()) { f = null; } File d = getDirectory(f); if (d == null) { return null; } return d.getAbsolutePath(); } public String variablesPressed() { StringVariableSelectionDialog varDlg = new StringVariableSelectionDialog(getShell()); varDlg.open(); String variableExpression = varDlg.getVariableExpression(); String currentDestdir = getTextControl().getText(); if (variableExpression == null) { return currentDestdir; } Point pt = getTextControl().getSelection(); String result = currentDestdir.substring(0, pt.x); result = result.concat(variableExpression); result = result.concat(currentDestdir.substring(pt.y, currentDestdir.length())); return result; } /* (non-Javadoc) * Method declared on StringFieldEditor (and FieldEditor). */ public void doFillIntoGrid(Composite parent, int numColumns) { super.doFillIntoGrid(parent, numColumns - 2); browseButton = getBrowseControl(parent); GridData browsegd = new GridData(); browsegd.horizontalAlignment = GridData.FILL; int widthHint = convertHorizontalDLUsToPixels(browseButton, IDialogConstants.BUTTON_WIDTH); browsegd.widthHint = Math.max(widthHint, browseButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); browseButton.setLayoutData(browsegd); variablesButton = getVarControl(parent); GridData vargd = new GridData(); vargd.horizontalAlignment = GridData.FILL; widthHint = convertHorizontalDLUsToPixels(variablesButton, IDialogConstants.BUTTON_WIDTH); vargd.widthHint = Math.max(widthHint, variablesButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); variablesButton.setLayoutData(vargd); } /** * Get the change control. Create it in parent if required. * @param parent * @return Button */ public Button getBrowseControl(Composite parent) { if (browseButton == null) { browseButton = new Button(parent, SWT.PUSH); if (browseButtonText == null) { browseButtonText = "Browse ..."; //$NON-NLS-1$ } browseButton.setText(browseButtonText); browseButton.setFont(parent.getFont()); browseButton.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent evt) { String newValue = browsePressed(); if (newValue != null) { setStringValue(newValue); } } }); browseButton.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent event) { browseButton = null; } }); } else { checkParent(browseButton, parent); } return browseButton; } /** * Get the variables control. Create it in parent if required. * @param parent * @return Button */ public Button getVarControl(Composite parent) { if (variablesButton == null) { variablesButton = new Button(parent, SWT.PUSH); if (variablesButtonText == null) { variablesButtonText = "Variables ..."; //$NON-NLS-1$ } variablesButton.setText(variablesButtonText); variablesButton.setFont(parent.getFont()); variablesButton.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent evt) { String newValue = variablesPressed(); if (newValue != null) { setStringValue(newValue); } } }); variablesButton.addDisposeListener(new DisposeListener() { public void widgetDisposed(DisposeEvent event) { variablesButton = null; } }); } else { checkParent(variablesButton, parent); } return variablesButton; } /* (non-Javadoc) * Method declared on FieldEditor. */ public int getNumberOfControls() { return 4; } /** * Returns this field editor's shell. * * @return the shell */ public Shell getShell() { if (browseButton == null) { return null; } return browseButton.getShell(); } /** * Sets the text of the change button. * * @param text the new text */ public void setbrowseButtonText(String text) { Assert.isNotNull(text); browseButtonText = text; if (browseButton != null) { browseButton.setText(text); Point prefSize = browseButton.computeSize(SWT.DEFAULT, SWT.DEFAULT); GridData data = (GridData) browseButton.getLayoutData(); data.widthHint = Math.max(SWT.DEFAULT, prefSize.x); } } /* (non-Javadoc) * @see org.eclipse.jface.preference.FieldEditor#setEnabled(boolean, org.eclipse.swt.widgets.Composite) */ public void setEnabled(boolean enabled, Composite parent) { super.setEnabled(enabled, parent); if (browseButton != null) { browseButton.setEnabled(enabled); } if (variablesButton != null) { variablesButton.setEnabled(enabled); } } /** * Helper that opens the directory chooser dialog. * @param startingDirectory The directory the dialog will open in. * @return File File or <code>null</code>. * */ private File getDirectory(File startingDirectory) { DirectoryDialog fileDialog = new DirectoryDialog(getShell(), SWT.OPEN | SWT.SHEET); if (startingDirectory != null) { fileDialog.setFilterPath(startingDirectory.getPath()); } else if (filterPath != null) { fileDialog.setFilterPath(filterPath.getPath()); } String dir = fileDialog.open(); if (dir != null) { dir = dir.trim(); if (dir.length() > 0) { return new File(dir); } } return null; } /** * Sets the initial path for the Browse dialog. * @param path initial path for the Browse dialog * @since 3.6 */ public void setFilterPath(File path) { filterPath = path; } }