Java tutorial
/******************************************************************************* * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc. * Distributed under license by Red Hat, Inc. All rights reserved. * This program is 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: * Exadel, Inc. and Red Hat, Inc. - initial API and implementation ******************************************************************************/ package org.jboss.tools.common.model.ui.attribute.editor; import java.util.ArrayList; import java.util.Arrays; import java.util.Iterator; import java.util.List; import org.eclipse.jface.action.IAction; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.GC; 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.jboss.tools.common.model.ui.actions.IActionProvider; import org.jboss.tools.common.model.ui.widgets.DefaultSettings; import org.jboss.tools.common.model.ui.widgets.IWidgetSettings; public class ActionButtonControl implements IPropertyFieldEditor { private Composite composite; private ArrayList<ButtonWrapper> buttons; private IPropertyEditor propertyEditor; private IActionProvider actionProvider; private IWidgetSettings settings = DefaultSettings.getDefault(); public void setPropertyEditor(IPropertyEditor propertyEditor) { this.propertyEditor = propertyEditor; initialize(); } public Control getControl() { return composite; } public Control createControl(Composite parent) { if (composite == null) { composite = new Composite(parent, SWT.NONE); composite.setBackgroundMode(SWT.INHERIT_DEFAULT); GridLayout layout = new GridLayout(); layout.horizontalSpacing = 5; layout.verticalSpacing = 5; layout.marginHeight = 0; layout.marginWidth = 0; composite.setLayout(layout); for (int i = 0; i < buttons.size(); ++i) { createButton(composite, (ButtonWrapper) buttons.get(i)); } } return composite; } private Control createButton(Composite parent, ButtonWrapper buttonWrapper) { int style = getSettings().getStyle("Button.Style"); //$NON-NLS-1$ if (style == SWT.DEFAULT) style = SWT.NONE; if (style == 0) style = SWT.PUSH; Control buttonControl = buttonWrapper.createControl(parent, style); // widget settings Color fg = getSettings().getColor("Button.Foreground"); //$NON-NLS-1$ Font font = getSettings().getFont("Button.Font"); //$NON-NLS-1$ buttonControl.setForeground(fg); buttonControl.setFont(font); // layout data GridData gd = new GridData(); gd.widthHint = convertHorizontalDLUsToPixels(buttonControl, IDialogConstants.BUTTON_WIDTH); buttonControl.setLayoutData(gd); return buttonControl; } private void initialize() { if (propertyEditor != null) { actionProvider = (IActionProvider) propertyEditor.getAdapter(IActionProvider.class); if (actionProvider == null) return; List actions = Arrays.asList(actionProvider.getActions()); Iterator i = actions.iterator(); ButtonWrapper buttonWrapper; buttons = new ArrayList<ButtonWrapper>(); while (i.hasNext()) { buttonWrapper = new ButtonWrapper((IAction) i.next()); buttons.add(buttonWrapper); } } } class ButtonWrapper implements IPropertyChangeListener { private IAction buttonAction; private Button buttonControl; private boolean enabled = Boolean.FALSE.booleanValue(); // by default private ButtonWrapper() { } public ButtonWrapper(IAction buttonAction) { this.buttonAction = buttonAction; this.enabled = buttonAction.isEnabled(); buttonAction.addPropertyChangeListener(this); } public Control createControl(Composite parent, int style) { if (buttonControl == null) { buttonControl = new Button(parent, style); buttonControl.setText(buttonAction.getText() != null ? buttonAction.getText() : "%text%"); //$NON-NLS-1$ buttonControl.setEnabled(enabled); buttonControl.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { buttonAction.run(); } public void widgetDefaultSelected(SelectionEvent e) { } }); } return buttonControl; } public Control getControl() { return buttonControl; } public void dispose() { buttonControl.dispose(); buttonControl = null; buttonAction = null; } public void setEnabled(boolean enabled) { this.enabled = enabled; if (buttonControl != null) buttonControl.setEnabled(enabled); } public void propertyChange(PropertyChangeEvent event) { if (IAction.ENABLED.equals(event.getProperty())) { this.enabled = ((Boolean) event.getNewValue()).booleanValue(); if (buttonControl != null && !buttonControl.isDisposed()) { buttonControl.setEnabled(this.enabled); } } } } public IWidgetSettings getSettings() { return settings; } public void setSettings(IWidgetSettings settings) { this.settings = settings; } protected int convertHorizontalDLUsToPixels(Control control, int dlus) { GC gc = new GC(control); gc.setFont(control.getFont()); int averageWidth = gc.getFontMetrics().getAverageCharWidth(); gc.dispose(); double horizontalDialogUnitSize = averageWidth * 0.25; return (int) Math.round(dlus * horizontalDialogUnitSize); } protected int convertVerticalDLUsToPixels(Control control, int dlus) { GC gc = new GC(control); gc.setFont(control.getFont()); int height = gc.getFontMetrics().getHeight(); gc.dispose(); double verticalDialogUnitSize = height * 0.125; return (int) Math.round(dlus * verticalDialogUnitSize); } public void setEnabled(boolean enabled) { IAction[] actions = actionProvider.getActions(); if (actions != null && actions.length > 0) { for (int i = 0; i < actions.length; ++i) actions[i].setEnabled(enabled); } } }