/*******************************************************************************
* Copyright (c) 2015 Pivotal, Inc.
* 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:
* Pivotal, Inc. - initial API and implementation
*******************************************************************************/
package org.springframework.ide.eclipse.boot.dash.views.sections;
import java.text.MessageFormat;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.bindings.keys.KeyStroke;
import org.eclipse.jface.fieldassist.ContentProposalAdapter;
import org.eclipse.jface.fieldassist.IContentProposalListener2;
import org.eclipse.jface.fieldassist.IContentProposalProvider;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
public abstract class StyledTextCellEditor extends CellEditor {
private ContentProposalAdapter contentProposalAdapter;
private boolean popupOpen = false; // true, iff popup is currently open
/**
* The text control; initially <code>null</code>.
*/
protected StyledText text;
private ModifyListener modifyListener;
/**
* State information for updating action enablement
*/
private boolean isSelection = false;
private boolean isDeleteable = false;
private boolean isSelectable = false;
/**
* Default TextCellEditor style
* specify no borders on text widget as cell outline in table already
* provides the look of a border.
*/
private static final int defaultStyle = SWT.SINGLE;
/**
* Creates a new text string cell editor with no control
* The cell editor value is the string itself, which is initially the empty
* string. Initially, the cell editor has no cell validator.
*
* @since 2.1
*/
public StyledTextCellEditor() {
setStyle(defaultStyle);
}
/**
* Creates a new text string cell editor parented under the given control.
* The cell editor value is the string itself, which is initially the empty string.
* Initially, the cell editor has no cell validator.
*
* @param parent the parent control
*/
public StyledTextCellEditor(Composite parent) {
this(parent, defaultStyle);
}
/**
* Creates a new text string cell editor parented under the given control.
* The cell editor value is the string itself, which is initially the empty string.
* Initially, the cell editor has no cell validator.
*
* @param parent the parent control
* @param style the style bits
* @since 2.1
*/
public StyledTextCellEditor(Composite parent, int style) {
super(parent, style);
}
public StyledTextCellEditor(Composite parent, IContentProposalProvider contentProposalProvider,
KeyStroke keyStroke, char[] autoActivationCharacters) {
this(parent);
enableContentProposal(contentProposalProvider, keyStroke, autoActivationCharacters);
}
public StyledTextCellEditor setProposalAcceptanceStyle(int acceptance) {
contentProposalAdapter.setProposalAcceptanceStyle(acceptance);
return this;
}
private void enableContentProposal(IContentProposalProvider contentProposalProvider, KeyStroke keyStroke,
char[] autoActivationCharacters) {
contentProposalAdapter = new ContentProposalAdapter(text, new StyledTextContentAdapter(),
contentProposalProvider, keyStroke, autoActivationCharacters);
// Listen for popup open/close events to be able to handle focus events correctly
contentProposalAdapter.addContentProposalListener(new IContentProposalListener2() {
public void proposalPopupClosed(ContentProposalAdapter adapter) {
popupOpen = false;
}
public void proposalPopupOpened(ContentProposalAdapter adapter) {
popupOpen = true;
}
});
}
/**
* Return the {@link ContentProposalAdapter} of this cell editor.
*
* @return the {@link ContentProposalAdapter}
*/
public ContentProposalAdapter getContentProposalAdapter() {
return contentProposalAdapter;
}
/**
* Checks to see if the "deletable" state (can delete/
* nothing to delete) has changed and if so fire an
* enablement changed notification.
*/
private void checkDeleteable() {
boolean oldIsDeleteable = isDeleteable;
isDeleteable = isDeleteEnabled();
if (oldIsDeleteable != isDeleteable) {
fireEnablementChanged(DELETE);
}
}
/**
* Checks to see if the "selectable" state (can select)
* has changed and if so fire an enablement changed notification.
*/
private void checkSelectable() {
boolean oldIsSelectable = isSelectable;
isSelectable = isSelectAllEnabled();
if (oldIsSelectable != isSelectable) {
fireEnablementChanged(SELECT_ALL);
}
}
/**
* Checks to see if the selection state (selection /
* no selection) has changed and if so fire an
* enablement changed notification.
*/
private void checkSelection() {
boolean oldIsSelection = isSelection;
isSelection = text.getSelectionCount() > 0;
if (oldIsSelection != isSelection) {
fireEnablementChanged(COPY);
fireEnablementChanged(CUT);
}
}
@Override
protected Control createControl(Composite parent) {
text = new StyledText(parent, getStyle());
text.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
handleDefaultSelection(e);
}
});
text.addKeyListener(new KeyAdapter() {
// hook key pressed - see PR 14201
@Override
public void keyPressed(KeyEvent e) {
keyReleaseOccured(e);
// as a result of processing the above call, clients may have
// disposed this cell editor
if ((getControl() == null) || getControl().isDisposed()) {
return;
}
checkSelection(); // see explanation below
checkDeleteable();
checkSelectable();
}
});
text.addTraverseListener(new TraverseListener() {
@Override
public void keyTraversed(TraverseEvent e) {
if (e.detail == SWT.TRAVERSE_ESCAPE
|| e.detail == SWT.TRAVERSE_RETURN) {
e.doit = false;
}
}
});
// We really want a selection listener but it is not supported so we
// use a key listener and a mouse listener to know when selection changes
// may have occurred
text.addMouseListener(new MouseAdapter() {
@Override
public void mouseUp(MouseEvent e) {
checkSelection();
checkDeleteable();
checkSelectable();
}
});
text.addFocusListener(new FocusAdapter() {
@Override
public void focusLost(FocusEvent e) {
StyledTextCellEditor.this.focusLost();
}
});
text.setFont(parent.getFont());
text.setBackground(parent.getBackground());
text.setText("");//$NON-NLS-1$
text.addModifyListener(getModifyListener());
return text;
}
/**
* The <code>TextCellEditor</code> implementation of
* this <code>CellEditor</code> framework method returns
* the text string.
*
* @return the text string
*/
@Override
protected Object doGetValue() {
return text.getText();
}
@Override
protected void doSetFocus() {
if (text != null) {
text.selectAll();
text.setFocus();
checkSelection();
checkDeleteable();
checkSelectable();
}
}
/**
* The <code>TextCellEditor</code> implementation of
* this <code>CellEditor</code> framework method accepts
* a text string (type <code>String</code>).
*
* @param value a text string (type <code>String</code>)
*/
@Override
protected void doSetValue(Object value) {
Assert.isTrue(text != null && (value instanceof String));
text.removeModifyListener(getModifyListener());
text.setText((String) value);
text.setStyleRanges(updateStyleRanges(text.getText()));
text.addModifyListener(getModifyListener());
}
/**
* Processes a modify event that occurred in this text cell editor.
* This framework method performs validation and sets the error message
* accordingly, and then reports a change via <code>fireEditorValueChanged</code>.
* Subclasses should call this method at appropriate times. Subclasses
* may extend or reimplement.
*
* @param e the SWT modify event
*/
protected void editOccured(ModifyEvent e) {
String value = text.getText();
if (value == null) {
value = "";//$NON-NLS-1$
}
Object typedValue = value;
boolean oldValidState = isValueValid();
boolean newValidState = isCorrect(typedValue);
if (!newValidState) {
// try to insert the current value into the error message.
setErrorMessage(MessageFormat.format(getErrorMessage(),
new Object[] { value }));
}
valueChanged(oldValidState, newValidState);
}
/**
* Since a text editor field is scrollable we don't
* set a minimumSize.
*/
@Override
public LayoutData getLayoutData() {
LayoutData data = new LayoutData();
data.minimumWidth= 0;
return data;
}
/**
* Return the modify listener.
*/
private ModifyListener getModifyListener() {
if (modifyListener == null) {
modifyListener = new ModifyListener() {
@Override
public void modifyText(ModifyEvent e) {
text.setStyleRanges(updateStyleRanges(text.getText()));
editOccured(e);
}
};
}
return modifyListener;
}
/**
* Handles a default selection event from the text control by applying the editor
* value and deactivating this cell editor.
*
* @param event the selection event
*
* @since 3.0
*/
protected void handleDefaultSelection(SelectionEvent event) {
// same with enter-key handling code in keyReleaseOccured(e);
fireApplyEditorValue();
deactivate();
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method returns <code>true</code> if
* the current selection is not empty.
*/
@Override
public boolean isCopyEnabled() {
if (text == null || text.isDisposed()) {
return false;
}
return text.getSelectionCount() > 0;
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method returns <code>true</code> if
* the current selection is not empty.
*/
@Override
public boolean isCutEnabled() {
if (text == null || text.isDisposed()) {
return false;
}
return text.getSelectionCount() > 0;
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method returns <code>true</code>
* if there is a selection or if the caret is not positioned
* at the end of the text.
*/
@Override
public boolean isDeleteEnabled() {
if (text == null || text.isDisposed()) {
return false;
}
return text.getSelectionCount() > 0
|| text.getCaretOffset() < text.getCharCount();
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method always returns <code>true</code>.
*/
@Override
public boolean isPasteEnabled() {
if (text == null || text.isDisposed()) {
return false;
}
return true;
}
/**
* Check if save all is enabled
* @return true if it is
*/
public boolean isSaveAllEnabled() {
if (text == null || text.isDisposed()) {
return false;
}
return true;
}
/**
* Returns <code>true</code> if this cell editor is
* able to perform the select all action.
* <p>
* This default implementation always returns
* <code>false</code>.
* </p>
* <p>
* Subclasses may override
* </p>
* @return <code>true</code> if select all is possible,
* <code>false</code> otherwise
*/
@Override
public boolean isSelectAllEnabled() {
if (text == null || text.isDisposed()) {
return false;
}
return text.getCharCount() > 0;
}
/**
* Processes a key release event that occurred in this cell editor.
* <p>
* The <code>TextCellEditor</code> implementation of this framework method
* ignores when the RETURN key is pressed since this is handled in
* <code>handleDefaultSelection</code>.
* An exception is made for Ctrl+Enter for multi-line texts, since
* a default selection event is not sent in this case.
* </p>
*
* @param keyEvent the key event
*/
@Override
protected void keyReleaseOccured(KeyEvent keyEvent) {
if (keyEvent.character == '\r') { // Return key
// Enter is handled in handleDefaultSelection.
// Do not apply the editor value in response to an Enter key event
// since this can be received from the IME when the intent is -not-
// to apply the value.
// See bug 39074 [CellEditors] [DBCS] canna input mode fires bogus event from Text Control
//
// An exception is made for Ctrl+Enter for multi-line texts, since
// a default selection event is not sent in this case.
if (text != null && !text.isDisposed()
&& (text.getStyle() & SWT.MULTI) != 0) {
if ((keyEvent.stateMask & SWT.CTRL) != 0) {
super.keyReleaseOccured(keyEvent);
}
}
if (popupOpen) {
return;
}
}
super.keyReleaseOccured(keyEvent);
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method copies the
* current selection to the clipboard.
*/
@Override
public void performCopy() {
text.copy();
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method cuts the
* current selection to the clipboard.
*/
@Override
public void performCut() {
text.cut();
checkSelection();
checkDeleteable();
checkSelectable();
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method deletes the
* current selection or, if there is no selection,
* the character next character from the current position.
*/
@Override
public void performDelete() {
if (text.getSelectionCount() > 0) {
// remove the contents of the current selection
text.insert(""); //$NON-NLS-1$
} else {
// remove the next character
int pos = text.getCaretOffset();
if (pos < text.getCharCount()) {
text.setSelection(pos, pos + 1);
text.insert(""); //$NON-NLS-1$
}
}
checkSelection();
checkDeleteable();
checkSelectable();
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method pastes the
* the clipboard contents over the current selection.
*/
@Override
public void performPaste() {
text.paste();
checkSelection();
checkDeleteable();
checkSelectable();
}
/**
* The <code>TextCellEditor</code> implementation of this
* <code>CellEditor</code> method selects all of the
* current text.
*/
@Override
public void performSelectAll() {
text.selectAll();
checkSelection();
checkDeleteable();
}
/**
* This implementation of
* {@link CellEditor#dependsOnExternalFocusListener()} returns false if the
* current instance's class is TextCellEditor, and true otherwise.
* Subclasses that hook their own focus listener should override this method
* and return false. See also bug 58777.
*
* @since 3.4
*/
@Override
protected boolean dependsOnExternalFocusListener() {
return false;
}
@Override
protected void focusLost() {
if (!popupOpen) {
// Focus lost deactivates the cell editor.
// This must not happen if focus lost was caused by activating
// the completion proposal popup.
super.focusLost();
}
}
abstract protected StyleRange[] updateStyleRanges(String text);
}