/**
* Initializes the ViewGroup and modifies it's default behavior by the passed attributes
*
* @param attrs the attributes used to modify default settings
*/
protected void init(AttributeSet attrs) {
gestureDetector = new GestureDetector(getContext(), new MyGestureListener());
quadrantTouched = new boolean[] {false, false, false, false, false};
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.CircleLayout);
speed = a.getInt(R.styleable.CircleLayout_speed, speed);
radius = a.getDimension(R.styleable.CircleLayout_radius, radius);
isRotating = a.getBoolean(R.styleable.CircleLayout_isRotating, isRotating);
// The angle where the first menu item will be drawn
angle = a.getInt(R.styleable.CircleLayout_firstChildPosition, (int) angle);
for (FirstChildPosition pos : FirstChildPosition.values()) {
if (pos.getAngle() == angle) {
firstChildPosition = pos;
break;
}
}
a.recycle();
// Needed for the ViewGroup to be drawn
setWillNotDraw(false);
}
}
public void setFirstChildPosition(FirstChildPosition firstChildPosition) {
this.firstChildPosition = firstChildPosition;
if (selectedView != null) {
if (isRotating) {
rotateViewToCenter(selectedView);
} else {
setAngle(firstChildPosition.getAngle());
}
}
}
/**
* Rotates the given view to the firstChildPosition
*
* @param view the view to be rotated
*/
public void rotateViewToCenter(View view) {
if (isRotating) {
float viewAngle = view.getTag() != null ? (Float) view.getTag() : 0;
float destAngle = firstChildPosition.getAngle() - viewAngle;
if (destAngle < 0) {
destAngle += 360;
}
if (destAngle > 180) {
destAngle = -1 * (360 - destAngle);
}
animateTo(angle + destAngle, 7500L / speed);
}
}
private void setChildAngles() {
int left, top, childWidth, childHeight, childCount = getChildCount();
float angleDelay = 360.0f / childCount;
float halfAngle = angleDelay / 2;
float localAngle = angle;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
if (localAngle > 360) {
localAngle -= 360;
} else if (localAngle < 0) {
localAngle += 360;
}
childWidth = child.getMeasuredWidth();
childHeight = child.getMeasuredHeight();
left =
Math.round(
(float)
(((circleWidth / 2.0) - childWidth / 2.0)
+ radius * Math.cos(Math.toRadians(localAngle))));
top =
Math.round(
(float)
(((circleHeight / 2.0) - childHeight / 2.0)
+ radius * Math.sin(Math.toRadians(localAngle))));
child.setTag(localAngle);
float distance = Math.abs(localAngle - firstChildPosition.getAngle());
boolean isFirstItem = distance <= halfAngle || distance >= (360 - halfAngle);
if (isFirstItem && selectedView != child) {
selectedView = child;
if (onItemSelectedListener != null && isRotating) {
onItemSelectedListener.onItemSelected(child);
}
}
child.layout(left, top, left + childWidth, top + childHeight);
localAngle += angleDelay;
}
}