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Charba, GWT Chart library based on CHART.JS
/**
Copyright 2017 Andrea "Stock" Stocchero
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.pepstock.charba.client.data;
import org.pepstock.charba.client.callbacks.DatasetContext;
import org.pepstock.charba.client.callbacks.FillCallback;
import org.pepstock.charba.client.callbacks.NativeCallback;
import org.pepstock.charba.client.callbacks.ScriptableFunctions.ProxyObjectCallback;
import org.pepstock.charba.client.callbacks.ScriptableUtils;
import org.pepstock.charba.client.commons.AbstractNode;
import org.pepstock.charba.client.commons.CallbackProxy;
import org.pepstock.charba.client.commons.JsHelper;
import org.pepstock.charba.client.commons.NativeObject;
import org.pepstock.charba.client.enums.Fill;
import org.pepstock.charba.client.enums.FillingMode;
import org.pepstock.charba.client.enums.IsFill;
import org.pepstock.charba.client.options.FillHandler;
/**
* Manages the FILL property of options for lining datasets, implementing the FILL callback for scriptable options.
*
* @author Andrea "Stock" Stocchero
*
*/
final class LiningDatasetFillHandler extends FillHandler {
// ---------------------------
// -- CALLBACKS PROXIES ---
// ---------------------------
// callback proxy to invoke the fill function
private final CallbackProxy fillCallbackProxy = JsHelper.get().newCallbackProxy();
// fill callback instance
private FillCallback fillCallback = null;
/**
* Creates a fill handler with the native object where FILL property must be managed and the default value to use when the property does not exist.
*
* @param parent model which contains the fill handler.
* @param defaultValues default value of FILL to use when the property does not exist
* @param nativeObject native object where FILL property must be managed
*/
LiningDatasetFillHandler(AbstractNode parent, IsFill defaultValues, NativeObject nativeObject) {
super(parent, defaultValues, new DataEnvelop<>(nativeObject));
// -------------------------------
// -- SET CALLBACKS to PROXIES ---
// -------------------------------
// sets function to proxy callback in order to invoke the java interface
this.fillCallbackProxy.setCallback(context -> onFill(new DatasetContext(context)));
}
/*
* (non-Javadoc)
*
* @see org.pepstock.charba.client.options.FillHandler#setFill(boolean)
*/
@Override
public void setFill(boolean fill) {
// reset callback
setFill((FillCallback) null);
// call set value
super.setFill(fill);
}
/*
* (non-Javadoc)
*
* @see org.pepstock.charba.client.options.FillHandler#setFill(org.pepstock.charba.client.enums.IsFill)
*/
@Override
public void setFill(IsFill fill) {
// reset callback
setFill((FillCallback) null);
// call set value
super.setFill(fill);
}
/*
* (non-Javadoc)
*
* @see org.pepstock.charba.client.options.FillHandler#getFill()
*/
@Override
public IsFill getFill() {
// checks if a callback has been set for this property
if (getFillCallback() == null) {
return super.getFill();
}
// if here, the property is a callback
// then returns the default
return getDefaultValues();
}
/**
* Returns the fill callback, if set, otherwise null.
*
* @return the fill callback, if set, otherwise null.
*/
FillCallback getFillCallback() {
return fillCallback;
}
/**
* Sets the fill callback.
*
* @param fillCallback the fill callback.
*/
void setFill(FillCallback fillCallback) {
// sets the callback
this.fillCallback = fillCallback;
// checks if callback is consistent
if (fillCallback != null) {
// adds the callback proxy function to java script object
setValue(FillHandler.Property.FILL, fillCallbackProxy.getProxy());
} else {
// otherwise sets null which removes the properties from java script object
remove(FillHandler.Property.FILL);
}
// remove if exist flag
remove(FillHandler.Property.CHARBA_FILLING_MODE);
}
/**
* Sets the fill callback.
*
* @param fillCallback the fill callback.
*/
void setFill(NativeCallback fillCallback) {
// resets callback
setFill((FillCallback) null);
// stores value
setValue(FillHandler.Property.FILL, fillCallback);
}
/**
* Returns a object which can be a boolean, integer, string or {@link IsFill} when the callback has been activated.
*
* @param context native object as context.
* @return a object property value
*/
private Object onFill(DatasetContext context) {
// gets value
Object result = ScriptableUtils.getOptionValue(context, getFillCallback());
// checks result type
if (result instanceof Boolean) {
// is boolean
// cast to boolean
return result;
} else if (result instanceof Integer) {
// is integer and then wants an absolute fill
// cast to integer
Integer resultAsInt = (Integer) result;
// returns the absolute fill, passing thru a isFill
return transformFill(Fill.getFill(resultAsInt));
} else if (result instanceof IsFill) {
// is a IsFill instance
// cast to IsFill
IsFill resultAsFill = (IsFill) result;
// returns the fill
return transformFill(resultAsFill);
} else if (result != null) {
// use the string representation of object
// as relative fill
// returns the relative fill, passing thru a isFill
return transformFill(Fill.getFill(result.toString()));
}
// if here, result is null
// then returns default
return transformFill(getDefaultValues());
}
/**
* Transforms a {@link IsFill} instance in the a CHART.JS FILL property accepted value.
*
* @param fill fill instance to transform
* @return a CHART.JS FILL property accepted value
*/
private Object transformFill(IsFill fill) {
// checks if is no fill
if (Fill.FALSE.equals(fill)) {
// boolean
return false;
} else if (Fill.isPredefined(fill)) {
// is predefined
// returns the string
return fill.value();
} else if (FillingMode.ABSOLUTE_DATASET_INDEX.equals(fill.getMode())) {
// is absolute
// returns the integer
return fill.getValueAsInt();
} else if (FillingMode.RELATIVE_DATASET_INDEX.equals(fill.getMode())) {
// is relative
// returns the string
return fill.getValue();
}
// default result
return false;
}
}