我可以在 LWUIT 中制作一个滑块控件，这意味着一个可以让用户移动以控制某些值的栏吗？
如果有人可以通过示例或教程提供帮助，我将不胜感激
问问题
778 次
3 回答
2
我只使用了无限模式。但是你有一个教程
于 2012-04-12T16:12:43.677 回答
1
在 LWUIT 1.5 中有这个Slider类。
于 2012-04-12T13:59:49.420 回答
0
我已经用运动组件完成了这个，我会为你提供
public MotionComponent(final Image background, final Image button,
final int x, final int minX, final int maxX, final boolean
useStops, final int numStops, final int time) {
this.background = background;
this.button = button;
this.minX = minX;
this.maxX = maxX;
this.useStops = useStops;
this.numStops = numStops;
this.time = time;
positionX = (maxX - minX) / 2;
this.moveToPoint = this.minX;
this.getStyle().setBgTransparency(0);
if (this.maxX < this.minX) {
int tmp = this.minX;
this.minX = this.maxX;
this.maxX = tmp;
}
if (button != null) {
this.maxX += (button.getWidth() / 2);
this.minX += (button.getWidth() / 2);
}
}
public void setStepSize(int step) {
this.stepSize = step;
}
public int getStepSize() {
return stepSize;
}
protected Dimension calcPreferredSize() {
//Style style = getStyle();
Dimension dimension = null;
dimension = new Dimension(background.getWidth(), 36);
return dimension;
}
public void initComponent() {
getComponentForm().registerAnimated(this);
}
public void paint(Graphics g) {
if (background != null) {
g.drawImage(background, getX(),
(getHeight() - background.getHeight()) / 2);
}
if (button != null) {
g.drawImage(button, positionX + button.getWidth()/2,
(getHeight() - button.getHeight()) / 2);
}
}
public void keyPressed(int keyCode) {
super.keyPressed(keyCode);
switch (Display.getInstance().getGameAction(keyCode)) {
case Display.GAME_DOWN:
case Display.GAME_UP:
break;
case Display.GAME_LEFT:
case Display.GAME_RIGHT:
if (useStops && motionX == null) {
System.out.println("key pressed motion");
motionX = Motion.createSplineMotion(positionX,
getDestPoint(positionX, numStops, minX, maxX,
Display.getInstance().getGameAction(keyCode)), time);
motionX.start();
} else {
if (motionX == null) {
motionX = Motion.createSplineMotion(positionX,
moveStep(positionX, stepSize,
Display.getInstance().getGameAction(keyCode), minX, maxX), time);
motionX.start();
}
}
System.out.println("key pressed");
break;
default:
System.out.println("key default");
return;
}
}
public void keyRepeated(int keyCode) {
super.keyRepeated(keyCode);
switch (Display.getInstance().getGameAction(keyCode)) {
case Display.GAME_DOWN:
case Display.GAME_UP:
break;
case Display.GAME_LEFT:
case Display.GAME_RIGHT:
if (useStops && motionX == null) {
motionX = Motion.createSplineMotion(positionX,
getDestPoint(positionX, numStops, minX, maxX,
Display.getInstance().getGameAction(keyCode)), time);
motionX.start();
}
System.out.println("key Repeated");
break;
default:
return;
}
}
private int moveStep(int x, int stepSize, int keyCode, int min, int
max) {
if (keyCode == Display.GAME_LEFT) {
if (x > min) {
if (x - stepSize < min) {
return min;
} else {
return x - stepSize;
}
} else {
return min;
}
} else {
if (x < max) {
if (x + stepSize > max) {
return max;
} else {
return x + stepSize;
}
} else {
return max;
}
}
}
/**
* returns a normalized value
* @return
*/
public float getValue() {
return ((positionX - minX) / (maxX - minX));
}
public void pointerPressed(int x, int y) {
Rectangle absoluteBounds = new Rectangle(getAbsoluteX(), getAbsoluteY(), getBounds().getSize());
if (absoluteBounds.contains(x, y)) {
System.out.println("pointerPressed " + x + " y " + y);
if (x != positionX) {
if (motionX == null) {
if (x < minX) {
motionX = Motion.createSplineMotion(positionX,
minX, time);
} else if (x > maxX) {
motionX = Motion.createSplineMotion(positionX,
maxX, time);
} else {
motionX = Motion.createSplineMotion(positionX, x,
time);
}
motionX.start();
} else {
// do what?
}
}
}else{
System.out.println("pointerPressed pointerPressed else " + x + " y " + y);
System.out.println("getBounds() x " + getBounds().getX() + ", y " + getBounds().getY() + ", w " + getBounds().getSize().getWidth() + ", h " + getBounds().getSize().getHeight());
}
}
int draggedX, draggedY;
public void pointerDragged(int x, int y) {
Rectangle absoluteBounds = new Rectangle(getAbsoluteX(), getAbsoluteY(), getBounds().getSize());
if (absoluteBounds.contains(x, y)) {
System.out.println("pointerDragged " + x + " y " + y);
draggedX = x;
draggedY = y;
if (motionX != null) {
//motionX.getValue()
} else {
positionX = x;
if (positionX < minX) {
positionX = minX;
}
if (positionX > maxX) {
positionX = maxX;
}
}
} else {
System.out.println("pointerDragged " + x + " y " + y);
System.out.println("pointerReleased ");
//when it exits bounds, call pointerReleased with the last
pointerReleased(draggedX, draggedY);
}
}
private int getDestPoint(int x, int numStops, int min, int max, int
direction) {
if (numStops < 2) {
if (direction == Display.GAME_LEFT) {
return min;
} else {
return max;
}
}
int distance = (max - min) / (numStops - 1);
if (direction == Display.GAME_LEFT) {
return moveToStopPoint(x - distance, numStops, min, max);
} else {
return moveToStopPoint(x + distance, numStops, min, max);
}
}
private int moveToStopPoint(int x, int numStops, int min, int max) {
int distance = max - min;
// will either go to min or max.
if (numStops < 2) {
if (x > min + (distance / 2)) {
return max;
} else {
return min;
}
}
float averageDistance = distance / (numStops - 1); // 5 stops,
if (x > max) {
return max;
}
if (x > min && x <= (min + (int) (averageDistance / 2))) {
return min;
} else if (x < max && x >= (max - (int) (averageDistance / 2))) {
return max;
} else {
for (int i = 0; i < numStops; i++) {
int currentMin = min + (int) (i * averageDistance);
if (x >= currentMin && x < currentMin + (int)
averageDistance / 2) {
return currentMin;
} else if (x >= currentMin + (int) averageDistance / 2 &&
x < currentMin + (int) averageDistance) {
return currentMin + (int) averageDistance;
}
}
}
return min;
}
public void pointerReleased(int x, int y) {
Rectangle absoluteBounds = new Rectangle(getAbsoluteX(), getAbsoluteY(), getBounds().getSize());
if (absoluteBounds.contains(x, y)) {
System.out.println("pointerReleased " + x + " y " + y);
if (useStops) {
if (x > maxX) {
x = maxX;
}
if (x < minX) {
x = minX;
}
if (motionX != null) {
motionX =
Motion.createSplineMotion(motionX.getValue(),
moveToStopPoint(motionX.getValue(), numStops, minX, maxX), time);
} else {
motionX = Motion.createSplineMotion(x,
moveToStopPoint(x, numStops, minX, maxX), time);
}
motionX.start();
}
} else {
// outside bounds. Should be caught previously with
}
}
public boolean animate() {
boolean val = false;
if (motionX != null) {
positionX = motionX.getValue();
if (motionX.isFinished()) {
motionX = null;
}
val = true;
}
return val;
}
}
普拉纳夫
于 2012-06-19T07:28:51.627 回答