SpinnerNumberModel.java
上传用户:haobig99
上传日期:2022-06-15
资源大小:369k
文件大小:5k
- /*
- * Copyright 2008 Sun Microsystems, Inc. All Rights Reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Sun designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Sun in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- */
- package com.sun.lwuit.spinner;
- import com.sun.lwuit.events.DataChangedListener;
- import com.sun.lwuit.events.SelectionListener;
- import com.sun.lwuit.list.ListModel;
- import com.sun.lwuit.util.EventDispatcher;
- /**
- * Represents a numeric model for the spinner
- *
- * @author Shai Almog
- */
- class SpinnerNumberModel implements ListModel {
- private EventDispatcher dataListener = new EventDispatcher();
- private EventDispatcher selectionListener = new EventDispatcher();
- private double min;
- private double max;
- private double currentValue;
- private double step;
- boolean realValues;
- void setValue(Object value) {
- if(value instanceof Integer) {
- currentValue = ((Integer)value).doubleValue();
- } else {
- currentValue = ((Double)value).doubleValue();
- }
- }
- Object getValue() {
- if(realValues) {
- return new Double(currentValue);
- }
- return new Integer((int)currentValue);
- }
- /**
- * Indicates the range of the spinner
- *
- * @param min lowest value allowed
- * @param max maximum value allowed
- * @param currentValue the starting value for the mode
- * @param step the value by which we increment the entries in the model
- */
- public SpinnerNumberModel(int min, int max, int currentValue, int step) {
- this.max = max;
- this.min = min;
- this.currentValue = currentValue;
- this.step = step;
- }
- /**
- * Indicates the range of the spinner
- *
- * @param min lowest value allowed
- * @param max maximum value allowed
- * @param currentValue the starting value for the mode
- * @param step the value by which we increment the entries in the model
- */
- public SpinnerNumberModel(double min, double max, double currentValue, double step) {
- this.max = max;
- this.min = min;
- this.currentValue = currentValue;
- this.step = step;
- realValues = true;
- }
- /**
- * @inheritDoc
- */
- public Object getItemAt(int index) {
- if(realValues) {
- return new Double(min + step * index);
- }
- return new Integer((int)(min + step * index));
- }
- /**
- * @inheritDoc
- */
- public int getSize() {
- return (int)((max - min) / step);
- }
- /**
- * @inheritDoc
- */
- public int getSelectedIndex() {
- // equivalent to round
- double d = Math.floor((max - currentValue) / step + 0.5);
- int v = getSize() - (int)d;
- return v;
- }
- /**
- * @inheritDoc
- */
- public void setSelectedIndex(int index) {
- int oldIndex = getSelectedIndex();
- currentValue = min + index * step;
- int newIndex = getSelectedIndex();
- selectionListener.fireSelectionEvent(oldIndex, newIndex);
- }
- /**
- * @inheritDoc
- */
- public void addDataChangedListener(DataChangedListener l) {
- dataListener.addListener(l);
- }
- /**
- * @inheritDoc
- */
- public void removeDataChangedListener(DataChangedListener l) {
- dataListener.removeListener(l);
- }
- /**
- * @inheritDoc
- */
- public void addSelectionListener(SelectionListener l) {
- selectionListener.addListener(l);
- }
- /**
- * @inheritDoc
- */
- public void removeSelectionListener(SelectionListener l) {
- selectionListener.removeListener(l);
- }
- /**
- * @inheritDoc
- */
- public void addItem(Object item) {
- }
- /**
- * @inheritDoc
- */
- public void removeItem(int index) {
- }
- /**
- * @return the min
- */
- public double getMin() {
- return min;
- }
- /**
- * @return the max
- */
- public double getMax() {
- return max;
- }
- }