/*
* 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 com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.ui.*;
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;
/**
* 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 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());
Constants constants = GWT.create(Constants.class);
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();
}
}