com.codename1.ui.Slider Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores
* CA 94065 USA or visit www.oracle.com if you need additional information or
* have any questions.
*/
package com.codename1.ui;
import com.codename1.ui.events.ActionEvent;
import com.codename1.ui.events.ActionListener;
import com.codename1.ui.events.ActionSource;
import com.codename1.ui.events.DataChangedListener;
import com.codename1.ui.geom.Dimension;
import com.codename1.ui.plaf.Style;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.EventDispatcher;
/**
* The slider component serves both as a slider widget to allow users to select
* a value on a scale via touch/arrows and also to indicate progress. The slider
* defaults to percentage display but can represent any positive set of values.
* 
*
*
* {@code Slider} is very versatile and can be used to represent things as diverse as the 5 star ranking UI
* demonstrated below. Notice that for the UI to work correctly you need to enclose it in a layout that preserves
* its preferred size like flow layout.
*
*
* 
*
*
* Slider can be used as a progress indicator for network operations when combined with the
* {@link com.codename1.components.SliderBridge} component:
*
*
* 
*
* @author Shai Almog
*/
public class Slider extends Label implements ActionSource {
private int actionEventValue;
private int value;
private int maxValue = 100;
private int minValue = 0;
private boolean vertical;
private boolean editable;
private EventDispatcher listeners = new EventDispatcher();
private EventDispatcher actionListeners = new EventDispatcher();
private int increments = 4;
private int previousX = -1, previousY = -1;
private Style sliderFull;
private Style sliderFullSelected;
private boolean paintingFull;
private boolean renderPercentageOnTop;
private boolean renderValueOnTop;
private boolean infinite = false;
private float infiniteDirection = 0.03f;
private Image thumbImage;
private String fullUIID = "Slider";
/**
* The default constructor uses internal rendering to draw its state
*/
public Slider() {
this("Slider", "Slider");
}
private Slider(String uiid, String fullUIID) {
setFocusable(false);
setUIID(uiid);
this.fullUIID = fullUIID;
setAlignment(CENTER);
// This is necessary for the Android theme to make sure that the progress bar
// is rendered vertically centered. Otherwise the thumb image will be
// rendered below it (on y axis) rather than over-top of it.
putClientProperty("@centerAlignHBorderBool", true);
}
/**
* {@inheritDoc}
*/
public void setUIID(String id) {
super.setUIID(id);
initStyles(id);
}
private void initStyles(String id){
sliderFull = getUIManager().getComponentStyle(id + "Full");
sliderFullSelected = getUIManager().getComponentSelectedStyle(id + "Full");
initCustomStyle(sliderFull);
initCustomStyle(sliderFullSelected);
}
/**
* {@inheritDoc}
*/
protected boolean isStickyDrag() {
return true;
}
/**
* {@inheritDoc}
*/
public void initComponent() {
if(infinite) {
getComponentForm().registerAnimatedInternal(this);
if(thumbImage == null) {
thumbImage = UIManager.getInstance().getThemeImageConstant("sliderThumbImage");
}
}
}
/**
* {@inheritDoc}
*/
public void deinitialize() {
if(infinite) {
Form f = getComponentForm();
if(f != null) {
f.deregisterAnimatedInternal(this);
}
}
}
/**
* {@inheritDoc}
*/
public boolean animate() {
if(infinite) {
super.animate();
float f = (infiniteDirection * ((float)maxValue));
if(((int)f) == 0) {
if(f < 0) {
f = -1;
} else {
f = 1;
}
}
value += ((int)f);
if(value >= maxValue) {
value = maxValue;
infiniteDirection *= (-1);
}
if(value <= 0) {
value = (int)0;
infiniteDirection *= (-1);
}
return true;
}
return super.animate();
}
/**
* The infinite slider functionality is used to animate
* progress for which there is no defined value.
*
* @return true for infinite progress
*/
public boolean isInfinite() {
return infinite;
}
/**
* Activates/disables the infinite slider functionality used to animate
* progress for which there is no defined value.
*
* @param i true for infinite progress
*/
public void setInfinite(boolean i) {
if(infinite != i) {
infinite = i;
if(isInitialized()) {
if(i) {
getComponentForm().registerAnimatedInternal(this);
} else {
getComponentForm().deregisterAnimatedInternal(this);
}
}
}
}
/**
* Creates an infinite progress slider
*
* @return a slider instance that has no end value
*/
public static Slider createInfinite() {
Slider s = new Slider();
s.infinite = true;
return s;
}
/**
* {@inheritDoc}
*/
public void refreshTheme(boolean merge) {
super.refreshTheme(merge);
if(sliderFull != null) {
deinitializeCustomStyle(sliderFull);
deinitializeCustomStyle(sliderFullSelected);
initStyles("Slider");
}
}
/**
* Indicates the value of progress made
*
* @return the progress on the slider
*/
public int getProgress() {
return value;
}
/**
* Gets the progress of the slider at the point where the provided ActionEvent
* was triggered.
* @param evt An ActionEvent that originated from this slider.
* @return The progress of the slider.
* @since 7.0
*/
public int getProgress(ActionEvent evt) {
if (evt instanceof SliderActionEvent) {
return ((SliderActionEvent)evt).value;
}
return value;
}
/**
* Indicates the value of progress made, this method is thread safe and
* can be invoked from any thread although discretion should still be kept
* so one thread doesn't regress progress made by another thread...
*
* @param value new value for progress
*/
public void setProgress(int value) {
if(this.value != value){
fireDataChanged(DataChangedListener.CHANGED, value);
}
setProgressInternal(value);
}
private void setProgressInternal(int value) {
this.value = value;
if(renderValueOnTop || renderPercentageOnTop) {
super.setText(formattedValue(value));
} else {
if(isInitialized()) {
repaint();
}
}
}
/**
* Allows formatting the appearance of the progress when text is drawn on top
*
* @param value the value of the slider
* @return a string formatted version
*/
protected String formattedValue(int value) {
if(renderValueOnTop) {
return("" + value);
}
if(renderPercentageOnTop) {
return(value + "%");
}
return("");
}
/**
* Returns the {@link com.codename1.ui.plaf.Style} used to paint the slider when its full
* @return the Style object that shows a completely full style.
*/
public Style getSliderFullUnselectedStyle() {
return sliderFull;
}
/**
* Returns the {@link com.codename1.ui.plaf.Style} used to paint the slider when its full and selected
* @return the Style object that shows a completely full style.
*/
public Style getSliderFullSelectedStyle() {
return sliderFullSelected;
}
/**
* Returns the {@link com.codename1.ui.plaf.Style} used to paint the slider when its full
* @return the Style object that shows a completely full style.
*/
public Style getSliderEmptyUnselectedStyle() {
return super.getUnselectedStyle();
}
/**
* Returns the {@link com.codename1.ui.plaf.Style} used to paint the slider when its full and selected
* @return the Style object that shows a completely full style.
*/
public Style getSliderEmptySelectedStyle() {
return super.getSelectedStyle();
}
/**
* {@inheritDoc}
*/
public Style getStyle() {
if(paintingFull) {
if(sliderFull == null) {
initStyles(fullUIID);
}
if(hasFocus()) {
return sliderFullSelected;
}
return sliderFull;
}
return super.getStyle();
}
/**
* Return the size we would generally like for the component
*/
protected Dimension calcPreferredSize() {
Style style = getStyle();
int prefW = 0, prefH = 0;
if(style.getBorder() != null) {
prefW = Math.max(style.getBorder().getMinimumWidth(), prefW);
prefH = Math.max(style.getBorder().getMinimumHeight(), prefH);
}
if(thumbImage != null) {
prefW = Math.max(thumbImage.getWidth(), prefW);
prefH = Math.max(thumbImage.getHeight(), prefH);
}
// we don't really need to be in the font height but this provides
// a generally good indication for size expectations
if(Display.getInstance().isTouchScreenDevice() && isEditable()) {
if(vertical) {
prefW = Math.max(prefW, Font.getDefaultFont().charWidth('X') * 2);
prefH = Math.max(prefH, Display.getInstance().getDisplayHeight() / 2);
} else {
prefW = Math.max(prefW, Display.getInstance().getDisplayWidth() / 2);
prefH = Math.max(prefH, Font.getDefaultFont().getHeight() * 2);
}
} else {
if(vertical) {
prefW = Math.max(prefW, Font.getDefaultFont().charWidth('X'));
prefH = Math.max(prefH, Display.getInstance().getDisplayHeight() / 2);
} else {
prefW = Math.max(prefW, Display.getInstance().getDisplayWidth() / 2);
prefH = Math.max(prefH, Font.getDefaultFont().getHeight());
}
}
if (prefH != 0) {
prefH += style.getVerticalPadding();
}
if (prefW != 0) {
prefW += style.getHorizontalPadding();
}
return new Dimension(prefW, prefH);
}
/**
* Paint the progress indicator
*/
public void paintComponentBackground(Graphics g) {
super.paintComponentBackground(g);
int clipX = g.getClipX();
int clipY = g.getClipY();
int clipW = g.getClipWidth();
int clipH = g.getClipHeight();
//g.pushClip();
int width = getWidth();
int height = getHeight();
int voffset = (thumbImage != null)? thumbImage.getHeight() : 0;
int y = getY();
if(infinite) {
int blockSize = getWidth() / 5;
int x = getX() + (int) ((((float) value) / ((float)maxValue - minValue)) * (getWidth() - blockSize));
g.clipRect(x, y, blockSize, height - 1);
} else {
if(vertical) {
int actualHeight = (int) ((((float) value) / ((float)maxValue - minValue)) * (getHeight() - voffset));
y += height - actualHeight - voffset;
} else {
width = (int) ((((float) value) / ((float)maxValue - minValue)) * getWidth());
}
g.clipRect(getX(), y, width, height);
}
// paint the selected style
paintingFull = true;
super.paintComponentBackground(g);
paintingFull = false;
g.setClip(clipX, clipY, clipW, clipH);
//g.popClip();
if(thumbImage != null && !infinite) {
if(!vertical) {
int xPos = getX() + width - thumbImage.getWidth() / 2;
xPos = Math.max(getX(), xPos);
xPos = Math.min(getX() + getWidth() - thumbImage.getWidth(), xPos);
g.drawImage(thumbImage, xPos,
y + height / 2 - thumbImage.getHeight() / 2);
} else {
int yPos = y;// + height - thumbImage.getHeight() / 2;
//yPos = Math.max(getY(), yPos);
//yPos = Math.min(getY() + getHeight() - thumbImage.getHeight(), yPos);
g.drawImage(thumbImage, getX() + width / 2 - thumbImage.getWidth() / 2,
yPos);
}
}
}
/**
* Indicates the slider is vertical
* @return true if the slider is vertical
*/
public boolean isVertical() {
return vertical;
}
/**
* Indicates the slider is vertical
* @param vertical true if the slider is vertical
*/
public void setVertical(boolean vertical) {
this.vertical = vertical;
}
/**
* Indicates the slider is modifyable
* @return true if the slider is editable
*/
public boolean isEditable() {
return editable;
}
/**
* Indicates the slider is modifyable
* @param editable true if the slider is editable
*/
public void setEditable(boolean editable) {
this.editable = editable;
setFocusable(editable);
}
public void pointerPressed(int x, int y) {
if (Display.getInstance().getImplementation().isScrollWheeling()) {
return;
}
if(!editable) {
return;
}
if(vertical) {
// turn the coordinate to a local coordinate and invert it
y = Math.abs(getHeight() - (y - getAbsoluteY()));
setProgressInternal((int)(Math.min(maxValue, ((float)y) / ((float)getHeight()) * maxValue)));
} else {
x = Math.abs(x - getAbsoluteX());
setProgressInternal((int)(Math.min(maxValue, ((float)x) / ((float)getWidth()) * maxValue)));
}
value = Math.max(value, minValue);
actionEventValue = value;
if(vertical) {
if(previousY < y){
fireDataChanged(DataChangedListener.ADDED, value);
}else{
fireDataChanged(DataChangedListener.REMOVED, value);
}
previousY = y;
}else{
if(previousX < x){
fireDataChanged(DataChangedListener.ADDED, value);
}else{
fireDataChanged(DataChangedListener.REMOVED, value);
}
previousX = x;
}
}
/**
* {@inheritDoc}
*/
public void pointerDragged(int x, int y) {
if (Display.getInstance().getImplementation().isScrollWheeling()) {
return;
}
if(!editable) {
return;
}
if(vertical && previousY == -1){
previousY = y - getAbsoluteY();
return;
}
if(!vertical && previousX == -1){
previousX = x - getAbsoluteX();
return;
}
int per = 0;
if(vertical) {
// turn the coordinate to a local coordinate and invert it
y = Math.max(getHeight() - (y - getAbsoluteY()), 0);
per = (int)(Math.min(maxValue, ((float)y) / ((float)getHeight()) * maxValue));
} else {
x = Math.max(x - getAbsoluteX(), 0);
per = (int)(Math.min(maxValue, ((float)x) / ((float)getWidth()) * maxValue));
}
per = Math.max(per, minValue);
if(per != getProgress()) {
setProgressInternal(per);
actionEventValue = value;
if(vertical) {
if(previousY < y){
fireDataChanged(DataChangedListener.ADDED, value);
}else{
fireDataChanged(DataChangedListener.REMOVED, value);
}
previousY = y;
}else{
if(previousX < x){
fireDataChanged(DataChangedListener.ADDED, value);
}else{
fireDataChanged(DataChangedListener.REMOVED, value);
}
previousX = x;
}
}
}
/**
* {@inheritDoc}
*/
protected void fireClicked() {
setHandlesInput(!handlesInput());
}
/**
* {@inheritDoc}
*/
protected boolean isSelectableInteraction() {
return editable;
}
/**
* {@inheritDoc}
*/
public void pointerReleased(int x, int y) {
if (Display.getInstance().getImplementation().isScrollWheeling()) {
return;
}
if(!editable) {
return;
}
fireActionEventImpl();
previousX = -1;
previousY = -1;
}
/**
* {@inheritDoc}
*/
public void keyReleased(int code) {
super.keyReleased(code);
fireActionEventImpl();
}
/**
* {@inheritDoc}
*/
public void keyPressed(int code) {
if(editable && handlesInput()) {
int game = Display.getInstance().getGameAction(code);
switch(game) {
case Display.GAME_UP:
if(vertical) {
setProgressInternal((int)(Math.min(maxValue, value + increments)));
fireDataChanged(DataChangedListener.ADDED, value);
} else {
setHandlesInput(false);
}
break;
case Display.GAME_DOWN:
if(vertical) {
setProgressInternal((int)(Math.max(minValue, value - increments)));
fireDataChanged(DataChangedListener.REMOVED, value);
} else {
setHandlesInput(false);
}
break;
case Display.GAME_LEFT:
if(!vertical) {
setProgressInternal((int)(Math.max(minValue, value - increments)));
fireDataChanged(DataChangedListener.REMOVED, value);
} else {
setHandlesInput(false);
}
break;
case Display.GAME_RIGHT:
if(!vertical) {
setProgressInternal((int)(Math.min(maxValue, value + increments)));
fireDataChanged(DataChangedListener.ADDED, value);
} else {
setHandlesInput(false);
}
break;
case Display.GAME_FIRE:
if(!Display.getInstance().isThirdSoftButton()) {
fireClicked();
}
break;
}
} else {
if(!Display.getInstance().isThirdSoftButton() &&
Display.getInstance().getGameAction(code) == Display.GAME_FIRE) {
fireClicked();
}
}
super.keyPressed(code);
}
/**
* The increments when the user presses a key to the left/right/up/down etc.
*
* @return increment value
*/
public int getIncrements() {
return increments;
}
/**
* The increments when the user presses a key to the left/right/up/down etc.
*
* @param increments increment value
*/
public void setIncrements(int increments) {
this.increments = increments;
}
private void fireDataChanged(int event, int val){
listeners.fireDataChangeEvent(val, event);
}
private void fireActionEventImpl() {
actionListeners.fireActionEvent(new SliderActionEvent());
}
/**
* Adds a listener to data changed events, notice that the status argument to the data change listener
* shouldn't be relied upon.
*
* @param l new listener
*/
public void addDataChangedListener(DataChangedListener l){
listeners.addListener(l);
}
/**
* Removes a listener from data changed events, notice that the status argument to the data change listener
* shouldn't be relied upon.
*
* @param l listener to remove
*/
public void removeDataChangedListener(DataChangedListener l){
listeners.removeListener(l);
}
/**
* Action listeners give a more coarse event only when the user lifts the finger from the slider
* @param l the listener
*/
public void addActionListener(ActionListener l) {
actionListeners.addListener(l);
}
/**
* Action listeners give a more coarse event only when the user lifts the finger from the slider
* @param l the listener
*/
public void removeActionListener(ActionListener l) {
actionListeners.removeListener(l);
}
/**
* Indicates that the value of the slider should be rendered with a percentage sign
* on top of the slider.
*
* @return true if so
*/
public boolean isRenderPercentageOnTop() {
return renderPercentageOnTop;
}
/**
* Indicates that the value of the slider should be rendered with a percentage sign
* on top of the slider.
*
* @param renderPercentageOnTop true to render percentages
*/
public void setRenderPercentageOnTop(boolean renderPercentageOnTop) {
this.renderPercentageOnTop = renderPercentageOnTop;
}
/**
* @return the renderValueOnTop
*/
public boolean isRenderValueOnTop() {
return renderValueOnTop;
}
/**
* @param renderValueOnTop the renderValueOnTop to set
*/
public void setRenderValueOnTop(boolean renderValueOnTop) {
this.renderValueOnTop = renderValueOnTop;
}
/**
* @return the maxValue
*/
public int getMaxValue() {
return maxValue;
}
/**
* @param maxValue the maxValue to set
*/
public void setMaxValue(int maxValue) {
this.maxValue = maxValue;
}
/**
* @return the minValue
*/
public int getMinValue() {
return minValue;
}
/**
* @param minValue the minValue to set
*/
public void setMinValue(int minValue) {
this.minValue = minValue;
}
/**
* The thumb image is drawn on top of the current progress
*
* @return the thumbImage
*/
public Image getThumbImage() {
return thumbImage;
}
/**
* The thumb image is drawn on top of the current progress
*
* @param thumbImage the thumbImage to set
*/
public void setThumbImage(Image thumbImage) {
this.thumbImage = thumbImage;
}
/**
* {@inheritDoc}
*/
protected boolean shouldBlockSideSwipe() {
return editable && !vertical;
}
private class SliderActionEvent extends ActionEvent {
private int value;
private SliderActionEvent() {
super(Slider.this, ActionEvent.Type.PointerPressed);
this.value = Slider.this.actionEventValue;
}
}
}
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