org.eclipse.jface.dialogs.PlainMessageDialog Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2021 SAP SE and others.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* https://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* SAP SE - initial api
*******************************************************************************/
package org.eclipse.jface.dialogs;
import java.util.Arrays;
import java.util.List;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.graphics.Image;
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.Shell;
/**
* The PlainMessageDialog represents a message dialog with a clear, simple API
* to create dialogs with message, buttons and image.
*
*
* Instances of this class can be created using the {@link Builder}. An instance
* of the builder can be retrieved by calling the static method
* {@link #getBuilder(Shell, String)}
*
*
*
* This class has to be favored over {@link MessageDialog}, which has an
* evolved, non-clear API.
*
*
* @since 3.23
*/
public class PlainMessageDialog extends IconAndMessageDialog {
private final String title;
private final Image titleImage;
private final Image image;
private final List buttonLabels;
private final int defaultButtonIndex;
private Control customArea;
/**
* The Builder to create PlainMessageDialog instances. It has a fluent API
* (every method returns the same builder instance).
*
* @since 3.23
*/
public static class Builder {
private Shell shell;
private String dialogTitle;
private Image titleImage;
private Image image;
private int iconId = -1;
private String message;
private List buttonLabels = Arrays.asList(IDialogConstants.OK_LABEL);
private int defaultButtonIndex = 0;
private Builder(Shell shell, String dialogTitle) {
this.shell = shell;
this.dialogTitle = dialogTitle;
}
/**
* Sets the shell's image.
*
* @see Shell#setImage(Image)
* @param image the image
* @return this
*/
public Builder titleImage(Image image) {
this.titleImage = image;
return this;
}
/**
* Sets the dialog's image (e.g. information icon).
*
* @param image the image
* @return this
*/
public Builder image(Image image) {
this.image = image;
return this;
}
/**
* Sets the dialog's image (e.g. information icon).
*
* @param iconId SWT style of the image, see below for support styles
*
* @return this
* @see SWT#ICON_ERROR
* @see SWT#ICON_INFORMATION
* @see SWT#ICON_QUESTION
* @see SWT#ICON_WARNING
* @see SWT#ICON_WORKING
*/
public Builder image(int iconId) {
this.iconId = iconId;
return this;
}
/**
* Sets the dialog's message.
*
* @param message the message
* @return this
*/
public Builder message(String message) {
this.message = message;
return this;
}
/**
* Sets the dialog's button labels. Without calling
* {@link #defaultButtonIndex(int)} the first entry is used for the default
* button.
*
* @param buttonLabels the button labels
* @return this
*/
public Builder buttonLabels(List buttonLabels) {
this.buttonLabels = buttonLabels;
return this;
}
/**
* Sets another (other than 0) button as default button.
*
* @param defaultButtonIndex the default button index
* @return this
*/
public Builder defaultButtonIndex(int defaultButtonIndex) {
this.defaultButtonIndex = defaultButtonIndex;
return this;
}
/**
* Create the dialog with all the parameters set in the builder.
*
* @return the PlainMessageDialog instance
*/
public PlainMessageDialog build() {
return new PlainMessageDialog(this);
}
}
/**
* Creates a new Builder instance.
*
* @param shell the parent shell
* @param dialogTitle the shell title
* @return the builder
*/
public static Builder getBuilder(Shell shell, String dialogTitle) {
return new Builder(shell, dialogTitle);
}
private PlainMessageDialog(Builder builder) {
super(builder.shell);
this.title = builder.dialogTitle;
this.titleImage = builder.titleImage;
if (builder.image == null && builder.iconId != -1) {
this.image = builder.shell.getDisplay().getSystemImage(builder.iconId);
} else {
this.image = builder.image;
}
this.message = builder.message;
this.buttonLabels = builder.buttonLabels;
this.defaultButtonIndex = builder.defaultButtonIndex;
}
@Override
protected void buttonPressed(int buttonId) {
setReturnCode(buttonId);
close();
}
@Override
protected void configureShell(Shell shell) {
super.configureShell(shell);
if (title != null) {
shell.setText(title);
}
if (titleImage != null) {
shell.setImage(titleImage);
}
}
@Override
protected void createButtonsForButtonBar(Composite parent) {
for (int id = 0; id < buttonLabels.size(); id++) {
createButton(parent, id, buttonLabels.get(id), defaultButtonIndex == id);
}
}
/**
* Creates and returns the contents of an area of the dialog which appears below
* the message and above the button bar.
*
* The default implementation of this framework method returns
* null. Subclasses may override.
*
*
* @param parent parent composite to contain the custom area
* @return the custom area control, or null
*/
protected Control createCustomArea(Composite parent) {
Label dummyLabelForSpacingPurposes = new Label(parent, SWT.NULL);
return dummyLabelForSpacingPurposes;
}
/**
* This implementation of the Dialog framework method creates and
* lays out a composite and calls createMessageArea and
* createCustomArea to populate it. Subclasses should override
* createCustomArea to add contents below the message.
*/
@Override
protected Control createDialogArea(Composite parent) {
// create message area
createMessageArea(parent);
// create the top level composite for the dialog area
Composite composite = new Composite(parent, SWT.NONE);
GridLayout layout = new GridLayout();
layout.marginHeight = 0;
layout.marginWidth = 0;
composite.setLayout(layout);
GridData data = new GridData(GridData.FILL_BOTH);
data.horizontalSpan = 2;
composite.setLayoutData(data);
// allow subclasses to add custom controls
customArea = createCustomArea(composite);
return composite;
}
/**
* Handle the shell close. Set the return code to SWT.DEFAULT as
* there has been no explicit close by the user.
*
* @see org.eclipse.jface.window.Window#handleShellCloseEvent()
*/
@Override
protected void handleShellCloseEvent() {
// Sets a return code of SWT.DEFAULT since none of the dialog buttons
// were pressed to close the dialog.
super.handleShellCloseEvent();
setReturnCode(SWT.DEFAULT);
}
/**
* Open
*
* @param style {@link SWT#NONE} for a default dialog, or {@link SWT#SHEET} for
* a dialog with sheet behavior
* @return true if the user presses the OK or Yes button,
* false otherwise
* @since 3.23
*/
public int open(int style) {
style &= SWT.SHEET;
this.setShellStyle(this.getShellStyle() | style);
return this.open();
}
@Override
protected Button createButton(Composite parent, int id, String label, boolean defaultButton) {
Button button = super.createButton(parent, id, label, defaultButton);
// Be sure to set the focus if the custom area cannot so as not
// to lose the defaultButton.
if (defaultButton && !customShouldTakeFocus()) {
button.setFocus();
}
return button;
}
/**
* Return whether or not we should apply the workaround where we take focus for
* the default button or if that should be determined by the dialog. By default
* only return true if the custom area is a label or CLabel that cannot take
* focus.
*
* @return boolean
*/
private boolean customShouldTakeFocus() {
if (customArea instanceof Label) {
return false;
}
if (customArea instanceof CLabel) {
return (customArea.getStyle() & SWT.NO_FOCUS) > 0;
}
return true;
}
@Override
protected Image getImage() {
return image;
}
}