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.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import java.util.Iterator; import org.eclipse.jface.dialogs.IDialogConstants; 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.eclipse.swt.widgets.Layout; import org.jboss.tools.common.model.ui.ModelUIPlugin; import org.jboss.tools.common.model.ui.widgets.DefaultSettings; import org.jboss.tools.common.model.ui.widgets.IWidgetSettings; public class DefaultButtonControl implements IButtonControl { private PropertyChangeSupport pcs = new PropertyChangeSupport(this); private Composite composite; private IWidgetSettings settings; private ArrayList<String> actions = new ArrayList<String>(); private HashMap<String, ButtonWrapper> buttons = new HashMap<String, ButtonWrapper>(); private Layout layout; public void setLayout(Layout layout) { this.layout = layout; } public void setWidgetSettings(IWidgetSettings settings) { this.settings = settings; } public void addButton(String action, String label) { actions.add(action); buttons.put(action, new ButtonWrapper(action, label)); if (this.composite != null) { // add button to composite createButton(composite, (ButtonWrapper) buttons.get(action)); refresh(); } } public void removeButton(String action) { actions.remove(action); buttons.remove(action); if (this.composite != null) { // remove button from composite ((ButtonWrapper) buttons.get(action)).dispose(); refresh(); } } public void clear() { // dispose buttons Iterator i = actions.iterator(); while (i.hasNext()) { ButtonWrapper buttonWrapper = ((ButtonWrapper) buttons.get(i.next())); buttonWrapper.dispose(); } refresh(); // clear HashSet actions.clear(); buttons.clear(); } public Control createControl(Composite parent) { if (composite == null) { composite = new Composite(parent, SWT.NONE); composite.setBackgroundMode(SWT.INHERIT_DEFAULT); // composite.setBackground(parent.getBackground()); if (layout == null) layout = createDefaultLayout(); composite.setLayout(layout); if (buttons.size() > 0) { // add all buttons Iterator i = actions.iterator(); while (i.hasNext()) { Object object = i.next(); ButtonWrapper buttonWrapper = (ButtonWrapper) buttons.get(object); if (buttonWrapper != null) { createButton(composite, buttonWrapper); } else { if (ModelUIPlugin.getDefault().isDebugging()) { ModelUIPlugin.getPluginLog().logInfo("No button for action: " + object); //$NON-NLS-1$ } } } } else { // set composite width equals button width + margins int margins = 0; if (layout instanceof GridLayout) { margins += ((GridLayout) layout).marginWidth * 2; } GridData gd = new GridData(); gd.widthHint = margins + convertHorizontalDLUsToPixels(composite, IDialogConstants.BUTTON_WIDTH); composite.setLayoutData(gd); } } return composite; } protected Layout createDefaultLayout() { GridLayout layout = new GridLayout(); layout.marginWidth = 0; layout.marginHeight = 0; layout.horizontalSpacing = 5; layout.verticalSpacing = 5; return layout; } protected Control createButton(Composite parent, ButtonWrapper buttonWrapper) { int style = getSettings().getStyle("Button.Style"); //$NON-NLS-1$ if (style == SWT.DEFAULT) style = SWT.PUSH; Control buttonControl = buttonWrapper.createControl(parent, style); // widget settings Color bg = getSettings().getColor("Button.Background"); //$NON-NLS-1$ Color fg = getSettings().getColor("Button.Foreground"); //$NON-NLS-1$ Font font = getSettings().getFont("Button.Font"); //$NON-NLS-1$ buttonControl.setBackground(bg); buttonControl.setForeground(fg); buttonControl.setFont(font); // layout data GridData gd = new GridData(); gd.widthHint = convertHorizontalDLUsToPixels(buttonControl, IDialogConstants.BUTTON_WIDTH); buttonControl.setLayoutData(gd); // return buttonControl; } protected void refresh() { Collection collection; Iterator i; if ((composite == null) || (composite.isDisposed())) return; // setRedraw(false) collection = buttons.values(); i = collection.iterator(); while (i.hasNext()) { ButtonWrapper buttonWrapper = (ButtonWrapper) i.next(); buttonWrapper.getControl().setRedraw(Boolean.FALSE.booleanValue()); } composite.setRedraw(Boolean.FALSE.booleanValue()); // layout(); composite.layout(Boolean.TRUE.booleanValue()); // setRedraw(true) collection = buttons.values(); i = collection.iterator(); while (i.hasNext()) { ButtonWrapper buttonWrapper = (ButtonWrapper) i.next(); buttonWrapper.getControl().setRedraw(Boolean.TRUE.booleanValue()); } composite.setRedraw(Boolean.TRUE.booleanValue()); } public Control getControl() { return composite; } public void setEnabled(String action, boolean enabled) { ((ButtonWrapper) buttons.get(action)).setEnabled(enabled); } public void dispose() { // remove all buttons clear(); // dispose component composite.dispose(); composite = null; // clear listeners } public void addPropertyChangeListener(PropertyChangeListener listener) { pcs.addPropertyChangeListener(listener); } public void removePropertyChangeListener(PropertyChangeListener listener) { pcs.removePropertyChangeListener(listener); } protected void firePropertyChange(PropertyChangeEvent event) { pcs.firePropertyChange(event); } protected void doButtonPressed(Button control, String action) { if (ModelUIPlugin.getDefault().isDebugging()) { ModelUIPlugin.getPluginLog().logInfo("Button pressed: " + action); //$NON-NLS-1$ } firePropertyChange(new PropertyChangeEvent(control, action, null, Boolean.TRUE)); } class ButtonWrapper { private String buttonAction; private String buttonLabel; private Button buttonControl; private boolean enabled = Boolean.TRUE.booleanValue(); // by default private ButtonWrapper() { } public ButtonWrapper(String buttonAction, String buttonLabel) { this.buttonAction = buttonAction; this.buttonLabel = buttonLabel; } public Control createControl(Composite parent, int style) { if (buttonControl == null) { buttonControl = new Button(parent, style); buttonControl.setText(buttonLabel); buttonControl.setEnabled(enabled); buttonControl.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { doButtonPressed(buttonControl, buttonAction); } public void widgetDefaultSelected(SelectionEvent e) { } }); } return buttonControl; } public Control getControl() { return buttonControl; } public void dispose() { buttonControl.dispose(); buttonControl = null; buttonAction = null; buttonLabel = null; } public void setEnabled(boolean enabled) { this.enabled = enabled; if (buttonControl != null) buttonControl.setEnabled(enabled); } } 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 IWidgetSettings getSettings() { if (settings == null) settings = DefaultSettings.getDefault(); return settings; } public void setSettings(IWidgetSettings settings) { this.settings = settings; } }