/*
* Copyright 2005 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.guvnor.client.ruleeditor;
import org.drools.guvnor.client.common.DirtyableComposite;
import org.drools.guvnor.client.common.ImageButton;
import org.drools.guvnor.client.messages.Constants;
import org.drools.guvnor.client.packages.SuggestionCompletionCache;
import org.drools.guvnor.client.resources.Images;
import org.drools.guvnor.client.rpc.RuleAsset;
import org.drools.guvnor.client.rpc.RuleContentText;
import org.drools.ide.common.client.modeldriven.SuggestionCompletionEngine;
import org.drools.ide.common.client.modeldriven.brl.DSLSentence;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyDownEvent;
import com.google.gwt.event.dom.client.KeyDownHandler;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.VerticalPanel;
/**
* This is a textual rule editor, which provides DSL content assistance. This is
* similar (but simpler) to the IDE based one.
*/
public class DSLRuleEditor extends DirtyableComposite {
private Constants constants = GWT.create( Constants.class );
private static Images images = GWT.create( Images.class );
private TextArea text;
final private RuleContentText data;
private DSLSentence[] conditions;
private DSLSentence[] actions;
public DSLRuleEditor(RuleAsset asset,
RuleViewer viewer) {
this( asset );
}
public DSLRuleEditor(RuleAsset asset) {
RuleContentText cont = (RuleContentText) asset.getContent();
this.data = cont;
text = new TextArea();
text.setWidth( "100%" );
text.setVisibleLines( 16 );
text.setText( data.content );
SuggestionCompletionEngine eng = SuggestionCompletionCache.getInstance().getEngineFromCache( asset.getMetaData().getPackageName() );
this.actions = eng.actionDSLSentences;
this.conditions = eng.conditionDSLSentences;
text.setStyleName( "dsl-text-Editor" ); //NON-NLS
FlexTable layout = new FlexTable();
layout.setWidget( 0,
0,
text );
text.addChangeHandler( new ChangeHandler() {
public void onChange(ChangeEvent event) {
data.content = text.getText();
makeDirty();
}
} );
text.addKeyDownHandler( new KeyDownHandler() {
public void onKeyDown(KeyDownEvent event) {
if ( event.getNativeKeyCode() == ' ' && event.getNativeKeyCode() == KeyCodes.KEY_CTRL ) {
showInTextOptions();
}
if ( event.getNativeKeyCode() == KeyCodes.KEY_TAB ) {
int nextPos = text.getCursorPos() + 1;
text.cancelKey();
insertText( "\t" );
text.setCursorPos( nextPos );
}
}
} );
VerticalPanel vert = new VerticalPanel();
Image lhsOptions = new ImageButton( images.newDSLPattern() );
final String msg = constants.AddANewCondition();
lhsOptions.setTitle( msg );
lhsOptions.addClickHandler( new ClickHandler() {
public void onClick(ClickEvent event) {
showSuggestions( conditions );
}
} );
Image rhsOptions = new ImageButton( images.newDSLAction() );
final String msg2 = constants.AddAnAction();
rhsOptions.setTitle( msg2 );
rhsOptions.addClickHandler( new ClickHandler() {
public void onClick(ClickEvent event) {
showSuggestions( actions );
}
} );
vert.add( lhsOptions );
vert.add( rhsOptions );
layout.setWidget( 0,
1,
vert );
layout.getCellFormatter().setWidth( 0,
0,
"95%" );
layout.getFlexCellFormatter().setAlignment( 0,
0,
HasHorizontalAlignment.ALIGN_LEFT,
HasVerticalAlignment.ALIGN_TOP );
layout.getCellFormatter().setWidth( 0,
1,
"5%" );
layout.getFlexCellFormatter().setAlignment( 0,
1,
HasHorizontalAlignment.ALIGN_CENTER,
HasVerticalAlignment.ALIGN_MIDDLE );
layout.setWidth( "100%" );
layout.setHeight( "100%" );
initWidget( layout );
}
protected void showInTextOptions() {
String prev = text.getText().substring( 0,
this.text.getCursorPos() );
if ( prev.indexOf( "then" ) > -1 ) {
showSuggestions( this.actions );
} else {
showSuggestions( this.conditions );
}
}
private void showSuggestions(DSLSentence[] items) {
ChoiceList choice = new ChoiceList( items,
this );
choice.setPopupPosition( text.getAbsoluteLeft() + 20,
text.getAbsoluteTop() + 20 );
choice.show();
}
void insertText(String ins) {
int i = text.getCursorPos();
String left = text.getText().substring( 0,
i );
String right = text.getText().substring( i,
text.getText().length() );
text.setText( left + ins + right );
this.data.content = text.getText();
}
}