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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.
/**
* Copyright 2009-2018 PrimeTek.
*
* 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.primefaces.component.knob;
import java.awt.Color;
import java.io.IOException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.convert.ConverterException;
import org.primefaces.renderkit.CoreRenderer;
import org.primefaces.util.WidgetBuilder;
public class KnobRenderer extends CoreRenderer {
public static final String RENDERER_TYPE = "org.primefaces.component.KnobRenderer";
@Override
public void decode(FacesContext context, UIComponent component) {
decodeBehaviors(context, component);
String submittedValue = (String) context.getExternalContext().getRequestParameterMap().get(component.getClientId(context) + "_hidden");
((Knob) component).setSubmittedValue(submittedValue);
}
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
this.encodeMarkup(context, (Knob) component);
this.encodeScript(context, (Knob) component);
}
private void encodeMarkup(FacesContext context, Knob knob) throws IOException {
ResponseWriter writer = context.getResponseWriter();
Object value = knob.getValue() != null ? knob.getValue() : 0;
writer.startElement("input", knob);
writer.writeAttribute("id", knob.getClientId(), null);
writer.writeAttribute("name", knob.getClientId(), null);
writer.writeAttribute("disabled", true, null);
writer.writeAttribute("value", value.toString(), null);
writer.writeAttribute("data-min", knob.getMin(), null);
writer.writeAttribute("data-step", knob.getStep(), null);
writer.writeAttribute("data-max", knob.getMax(), null);
writer.writeAttribute("data-displayInput", Boolean.toString(knob.isShowLabel()), null);
writer.writeAttribute("data-readOnly", Boolean.toString(knob.isDisabled()), null);
writer.writeAttribute("data-cursor", Boolean.toString(knob.isCursor()), null);
writer.writeAttribute("data-linecap", knob.getLineCap(), "butt");
if (knob.getThickness() != null) {
writer.writeAttribute("data-thickness", knob.getThickness(), null);
}
if (knob.getWidth() != null) {
writer.writeAttribute("data-width", knob.getWidth().toString(), null);
}
if (knob.getHeight() != null) {
writer.writeAttribute("data-height", knob.getHeight().toString(), null);
}
writer.writeAttribute("class", "knob", null);
writer.endElement("input");
writer.startElement("input", null);
writer.writeAttribute("id", knob.getClientId() + "_hidden", null);
writer.writeAttribute("name", knob.getClientId() + "_hidden", null);
writer.writeAttribute("type", "hidden", null);
writer.writeAttribute("value", value.toString(), null);
writer.endElement("input");
}
private void encodeScript(FacesContext context, Knob knob) throws IOException {
String clientId = knob.getClientId();
String widgetVar = knob.resolveWidgetVar();
WidgetBuilder wb = getWidgetBuilder(context);
wb.initWithDomReady("Knob", widgetVar, clientId);
wb.attr("labelTemplate", knob.getLabelTemplate())
.attr("colorTheme", knob.getColorTheme())
.callback("onchange", "function(value)", knob.getOnchange());
if (knob.getForegroundColor() != null) {
String fg;
if (knob.getForegroundColor() instanceof Color) {
fg = colorToHex((Color) knob.getForegroundColor());
}
else {
fg = knob.getForegroundColor().toString();
}
wb.attr("fgColor", fg);
}
if (knob.getBackgroundColor() != null) {
String bg;
if (knob.getBackgroundColor() instanceof Color) {
bg = colorToHex((Color) knob.getBackgroundColor());
}
else {
bg = knob.getBackgroundColor().toString();
}
wb.attr("bgColor", bg);
}
encodeClientBehaviors(context, knob);
wb.finish();
}
@Override
public Object getConvertedValue(FacesContext context, UIComponent component, Object submittedValue) throws ConverterException {
if (submittedValue == null) {
submittedValue = 0;
}
try {
return ((submittedValue instanceof Integer) ? submittedValue : Integer.parseInt(submittedValue.toString()));
}
catch (NumberFormatException e) {
throw new ConverterException(e);
}
}
public static String colorToHex(Color color) {
String red = Integer.toHexString(color.getRed());
if (red.length() < 2) {
red = "0" + red;
}
String blue = Integer.toHexString(color.getBlue());
if (blue.length() < 2) {
blue = "0" + blue;
}
String green = Integer.toHexString(color.getGreen());
if (green.length() < 2) {
green = "0" + green;
}
return "#" + red + green + blue;
}
}