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/*
* Copyright 2014-2016 See AUTHORS file.
*
* 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 com.kotcrab.vis.ui.widget.spinner;
/**
* Classes implementing this interface represent model that can be used with {@link Spinner}. Model defines what is scrolled
* in spinner (eg. int numbers, floats or some arbitrary strings), set-ups input validation and updates it's value if user
* changed text in spinner value text field.
*
* Classes wanting to implement this interface should inherit from {@link AbstractSpinnerModel} to simplify event handling.
* @author Kotcrab
* @see AbstractSpinnerModel
* @see IntSpinnerModel
* @see FloatSpinnerModel
* @see SimpleFloatSpinnerModel
* @see ArraySpinnerModel
* @since 1.0.2
*/
public interface SpinnerModel {
/**
* Called when model is assigned to {@link Spinner}. When this is called Spinner has been initialised so it's safe to
* do operation on it such as adding custom validators to text field.
*
* If this model can't be reused then in this function it should verify that it is not being bound for the second time.
*
* After model has finished it's setup it should call {@link Spinner#notifyValueChanged(boolean)} with true to perform
* first update and set initial spinner value.
* @param spinner that this model was assigned to
*/
void bind (Spinner spinner);
/**
* Called when spinner text has changed. Usually this is the moment when model has to update it's current value variable.
* If input is invalid when this it called then it should simply be ignored. If field loses focus while it is in
* invalid state then last valid value will be automatically restored. This should NOT call {@link Spinner#notifyValueChanged(boolean)}.
*/
void textChanged ();
/**
* Steps model up by one. Depending of the implementation this could move model to next item or increment it's value by
* arbitrary amount. Implementation class MUST call {@link Spinner#notifyValueChanged(boolean)} with fireEvent param set to
* {@link Spinner#isProgrammaticChangeEvents()}
*
* @return true when value was changed, false otherwise
*/
boolean increment ();
/**
* Steps model up by one. Depending of the implementation this could move model to next item or increment it's value by
* arbitrary amount. Implementation class MUST call {@link Spinner#notifyValueChanged(boolean)} using fireEvent param as argument.
*
* @return true when value was changed, false otherwise
*/
boolean increment (boolean fireEvent);
/**
* Steps model down by one. Depending of the implementation this could move model to previous item or decrement it's value by
* arbitrary amount. Implementation class MUST call {@link Spinner#notifyValueChanged(boolean)} with fireEvent param set to
* {@link Spinner#isProgrammaticChangeEvents()}
*
* @return true when value was changed, false otherwise
*/
boolean decrement ();
/**
* Steps model down by one. Depending of the implementation this could move model to previous item or decrement it's value by
* arbitrary amount. Implementation class MUST call {@link Spinner#notifyValueChanged(boolean)} using fireEvent param as argument.
*
* @return true when value was changed, false otherwise
*/
boolean decrement (boolean fireEvent);
/**
* Allows to enable model wrapping: if last element of model is reached and {@link #decrement()} was called then it
* will be looped to first element. Same applies for last element and {@link #increment()}
* @param wrap whether to wrap this model or not
*/
void setWrap (boolean wrap);
/** @return true if model wrapping is enabled, false otherwise. See {@link #setWrap(boolean)} */
boolean isWrap ();
/** @return text representation of current model value */
String getText ();
}