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package com.vaadin.tests.declarative;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.commons.io.IOUtils;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.Component;
import com.vaadin.ui.HasComponents;
import com.vaadin.ui.HorizontalSplitPanel;
import com.vaadin.ui.Panel;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.declarative.Design;
import com.vaadin.ui.declarative.DesignContext;
import com.vaadin.v7.data.Property.ReadOnlyException;
import com.vaadin.v7.data.Property.ValueChangeNotifier;
public class DeclarativeEditor extends UI {
private VerticalLayout treeHolder;
private TextArea editor;
private DesignContext dc;
private boolean disableEvents = false;
private HorizontalSplitPanel main;
@Override
protected void init(VaadinRequest request) {
main = new HorizontalSplitPanel();
editor = new TextArea();
editor.setSizeFull();
try {
editor.setValue(IOUtils.toString(getClass()
.getResourceAsStream("DeclarativeEditorInitial.html")));
} catch (ReadOnlyException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
editor.addValueChangeListener(listener -> {
editor.setComponentError(null);
updateTree(listener.getValue());
});
Panel editorPanel = new Panel(editor);
editorPanel.setSizeFull();
treeHolder = new VerticalLayout();
treeHolder.setSizeFull();
main.addComponents(editorPanel, treeHolder);
main.setSizeFull();
setContent(main);
updateTree(editor.getValue());
}
protected void updateTree(String string) {
if (disableEvents) {
return;
}
dc = Design.read(new ByteArrayInputStream(string.getBytes()), null);
treeHolder.removeAllComponents();
treeHolder.addComponent(dc.getRootComponent());
addValueChangeListeners(dc.getRootComponent());
}
protected void updateCode() {
if (disableEvents) {
return;
}
ByteArrayOutputStream o = new ByteArrayOutputStream();
try {
Design.write(treeHolder.getComponent(0), o);
disableEvents = true;
editor.setValue(o.toString(UTF_8.name()));
disableEvents = false;
} catch (IOException e1) {
e1.printStackTrace();
}
}
private void addValueChangeListeners(Component component) {
if (component instanceof ValueChangeNotifier) {
((ValueChangeNotifier) component)
.addValueChangeListener(event -> updateCode());
}
if (component instanceof HasComponents) {
for (Component c : (HasComponents) component) {
addValueChangeListeners(c);
}
}
}
}
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