/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation 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:
* IBM Corporation - initial API and implementation
* Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog
* font should be activated and used by other components.
*******************************************************************************/
package org.eclipse.ui.dialogs;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
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.eclipse.ui.PlatformUI;
/**
* An abstract class to select elements out of a list of elements.
*
* @since 2.0
*/
public abstract class AbstractElementListSelectionDialog extends
SelectionStatusDialog {
private ILabelProvider fRenderer;
private boolean fIgnoreCase = true;
private boolean fIsMultipleSelection = false;
private boolean fMatchEmptyString = true;
private boolean fAllowDuplicates = true;
private Label fMessage;
protected FilteredList fFilteredList;
private Text fFilterText;
private ISelectionStatusValidator fValidator;
private String fFilter = null;
private String fEmptyListMessage = ""; //$NON-NLS-1$
private String fEmptySelectionMessage = ""; //$NON-NLS-1$
private int fWidth = 60;
private int fHeight = 18;
private Object[] fSelection = new Object[0];
/**
* Constructs a list selection dialog.
* @param parent The parent for the list.
* @param renderer ILabelProvider for the list
*/
protected AbstractElementListSelectionDialog(Shell parent,
ILabelProvider renderer) {
super(parent);
fRenderer = renderer;
int shellStyle = getShellStyle();
setShellStyle(shellStyle | SWT.MAX | SWT.RESIZE);
}
/**
* Handles default selection (double click).
* By default, the OK button is pressed.
*/
protected void handleDefaultSelected() {
if (validateCurrentSelection()) {
buttonPressed(IDialogConstants.OK_ID);
}
}
/**
* Specifies if sorting, filtering and folding is case sensitive.
* @param ignoreCase
*/
public void setIgnoreCase(boolean ignoreCase) {
fIgnoreCase = ignoreCase;
}
/**
* Returns if sorting, filtering and folding is case sensitive.
* @return boolean
*/
public boolean isCaseIgnored() {
return fIgnoreCase;
}
/**
* Specifies whether everything or nothing should be filtered on
* empty filter string.
* @param matchEmptyString boolean
*/
public void setMatchEmptyString(boolean matchEmptyString) {
fMatchEmptyString = matchEmptyString;
}
/**
* Specifies if multiple selection is allowed.
* @param multipleSelection
*/
public void setMultipleSelection(boolean multipleSelection) {
fIsMultipleSelection = multipleSelection;
}
/**
* Specifies whether duplicate entries are displayed or not.
* @param allowDuplicates
*/
public void setAllowDuplicates(boolean allowDuplicates) {
fAllowDuplicates = allowDuplicates;
}
/**
* Sets the list size in unit of characters.
* @param width the width of the list.
* @param height the height of the list.
*/
public void setSize(int width, int height) {
fWidth = width;
fHeight = height;
}
/**
* Sets the message to be displayed if the list is empty.
* @param message the message to be displayed.
*/
public void setEmptyListMessage(String message) {
fEmptyListMessage = message;
}
/**
* Sets the message to be displayed if the selection is empty.
* @param message the message to be displayed.
*/
public void setEmptySelectionMessage(String message) {
fEmptySelectionMessage = message;
}
/**
* Sets an optional validator to check if the selection is valid.
* The validator is invoked whenever the selection changes.
* @param validator the validator to validate the selection.
*/
public void setValidator(ISelectionStatusValidator validator) {
fValidator = validator;
}
/**
* Sets the elements of the list (widget).
* To be called within open().
* @param elements the elements of the list.
*/
protected void setListElements(Object[] elements) {
Assert.isNotNull(fFilteredList);
fFilteredList.setElements(elements);
}
/**
* Sets the filter pattern.
* @param filter the filter pattern.
*/
public void setFilter(String filter) {
if (fFilterText == null) {
fFilter = filter;
} else {
fFilterText.setText(filter);
}
}
/**
* Returns the current filter pattern.
* @return returns the current filter pattern or <code>null<code> if filter was not set.
*/
public String getFilter() {
if (fFilteredList == null) {
return fFilter;
} else {
return fFilteredList.getFilter();
}
}
/**
* Returns the indices referring the current selection.
* To be called within open().
* @return returns the indices of the current selection.
*/
protected int[] getSelectionIndices() {
Assert.isNotNull(fFilteredList);
return fFilteredList.getSelectionIndices();
}
/**
* Returns an index referring the first current selection.
* To be called within open().
* @return returns the indices of the current selection.
*/
protected int getSelectionIndex() {
Assert.isNotNull(fFilteredList);
return fFilteredList.getSelectionIndex();
}
/**
* Sets the selection referenced by an array of elements.
* Empty or null array removes selection.
* To be called within open().
* @param selection the indices of the selection.
*/
protected void setSelection(Object[] selection) {
Assert.isNotNull(fFilteredList);
fFilteredList.setSelection(selection);
}
/**
* Returns an array of the currently selected elements.
* To be called within or after open().
* @return returns an array of the currently selected elements.
*/
protected Object[] getSelectedElements() {
Assert.isNotNull(fFilteredList);
return fFilteredList.getSelection();
}
/**
* Returns all elements which are folded together to one entry in the list.
* @param index the index selecting the entry in the list.
* @return returns an array of elements folded together.
*/
public Object[] getFoldedElements(int index) {
Assert.isNotNull(fFilteredList);
return fFilteredList.getFoldedElements(index);
}
/**
* Creates the message text widget and sets layout data.
* @param composite the parent composite of the message area.
*/
protected Label createMessageArea(Composite composite) {
Label label = super.createMessageArea(composite);
GridData data = new GridData();
data.grabExcessVerticalSpace = false;
data.grabExcessHorizontalSpace = true;
data.horizontalAlignment = GridData.FILL;
data.verticalAlignment = GridData.BEGINNING;
label.setLayoutData(data);
fMessage = label;
return label;
}
/**
* Handles a selection changed event.
* By default, the current selection is validated.
*/
protected void handleSelectionChanged() {
validateCurrentSelection();
}
/**
* Validates the current selection and updates the status line
* accordingly.
* @return boolean <code>true</code> if the current selection is
* valid.
*/
protected boolean validateCurrentSelection() {
Assert.isNotNull(fFilteredList);
IStatus status;
Object[] elements = getSelectedElements();
if (elements.length > 0) {
if (fValidator != null) {
status = fValidator.validate(elements);
} else {
status = new Status(IStatus.OK, PlatformUI.PLUGIN_ID,
IStatus.OK, "", //$NON-NLS-1$
null);
}
} else {
if (fFilteredList.isEmpty()) {
status = new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID,
IStatus.ERROR, fEmptyListMessage, null);
} else {
status = new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID,
IStatus.ERROR, fEmptySelectionMessage, null);
}
}
updateStatus(status);
return status.isOK();
}
/*
* @see Dialog#cancelPressed
*/
protected void cancelPressed() {
setResult(null);
super.cancelPressed();
}
/**
* Creates a filtered list.
* @param parent the parent composite.
* @return returns the filtered list widget.
*/
protected FilteredList createFilteredList(Composite parent) {
int flags = SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL
| (fIsMultipleSelection ? SWT.MULTI : SWT.SINGLE);
FilteredList list = new FilteredList(parent, flags, fRenderer,
fIgnoreCase, fAllowDuplicates, fMatchEmptyString);
GridData data = new GridData();
data.widthHint = convertWidthInCharsToPixels(fWidth);
data.heightHint = convertHeightInCharsToPixels(fHeight);
data.grabExcessVerticalSpace = true;
data.grabExcessHorizontalSpace = true;
data.horizontalAlignment = GridData.FILL;
data.verticalAlignment = GridData.FILL;
list.setLayoutData(data);
list.setFont(parent.getFont());
list.setFilter((fFilter == null ? "" : fFilter)); //$NON-NLS-1$
list.addSelectionListener(new SelectionListener() {
public void widgetDefaultSelected(SelectionEvent e) {
handleDefaultSelected();
}
public void widgetSelected(SelectionEvent e) {
handleWidgetSelected();
}
});
fFilteredList = list;
return list;
}
// 3515
private void handleWidgetSelected() {
Object[] newSelection = fFilteredList.getSelection();
if (newSelection.length != fSelection.length) {
fSelection = newSelection;
handleSelectionChanged();
} else {
for (int i = 0; i != newSelection.length; i++) {
if (!newSelection[i].equals(fSelection[i])) {
fSelection = newSelection;
handleSelectionChanged();
break;
}
}
}
}
protected Text createFilterText(Composite parent) {
Text text = new Text(parent, SWT.BORDER);
GridData data = new GridData();
data.grabExcessVerticalSpace = false;
data.grabExcessHorizontalSpace = true;
data.horizontalAlignment = GridData.FILL;
data.verticalAlignment = GridData.BEGINNING;
text.setLayoutData(data);
text.setFont(parent.getFont());
text.setText((fFilter == null ? "" : fFilter)); //$NON-NLS-1$
Listener listener = new Listener() {
public void handleEvent(Event e) {
fFilteredList.setFilter(fFilterText.getText());
}
};
text.addListener(SWT.Modify, listener);
text.addKeyListener(new KeyListener() {
public void keyPressed(KeyEvent e) {
if (e.keyCode == SWT.ARROW_DOWN) {
fFilteredList.setFocus();
}
}
public void keyReleased(KeyEvent e) {
}
});
fFilterText = text;
return text;
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.window.Window#open()
*/
public int open() {
super.open();
return getReturnCode();
}
private void access$superCreate() {
super.create();
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.window.Window#create()
*/
public void create() {
BusyIndicator.showWhile(null, new Runnable() {
public void run() {
access$superCreate();
Assert.isNotNull(fFilteredList);
if (fFilteredList.isEmpty()) {
handleEmptyList();
} else {
validateCurrentSelection();
fFilterText.selectAll();
fFilterText.setFocus();
}
}
});
}
/**
* Handles empty list by disabling widgets.
*/
protected void handleEmptyList() {
fMessage.setEnabled(false);
fFilterText.setEnabled(false);
fFilteredList.setEnabled(false);
updateOkState();
}
/**
* Update the enablement of the OK button based on whether or not there
* is a selection.
*
*/
protected void updateOkState() {
Button okButton = getOkButton();
if (okButton != null) {
okButton.setEnabled(getSelectedElements().length != 0);
}
}
}