/**
* Performs layout for the minor axis of the box (i.e. the axis orthogonal to the axis that it
* represents). The results of the layout (the offset and span for each children) are placed in
* the given arrays which represent the allocations to the children along the minor axis.
*
* @param targetSpan the total span given to the view, which would be used to layout the children.
* @param axis the axis being layed out
* @param offsets the offsets from the origin of the view for each of the child views; this is a
* return value and is filled in by the implementation of this method
* @param spans the span of each child view; this is a return value and is filled in by the
* implementation of this method
*/
protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans) {
int n = getViewCount();
Object key = (axis == X_AXIS) ? CSS.Attribute.WIDTH : CSS.Attribute.HEIGHT;
for (int i = 0; i < n; i++) {
View v = getView(i);
int min = (int) v.getMinimumSpan(axis);
int max;
// check for percentage span
AttributeSet a = v.getAttributes();
CSS.LengthValue lv = (CSS.LengthValue) a.getAttribute(key);
if ((lv != null) && lv.isPercentage()) {
// bound the span to the percentage specified
min = Math.max((int) lv.getValue(targetSpan), min);
max = min;
} else {
max = (int) v.getMaximumSpan(axis);
}
// assign the offset and span for the child
if (max < targetSpan) {
// can't make the child this wide, align it
float align = v.getAlignment(axis);
offsets[i] = (int) ((targetSpan - max) * align);
spans[i] = max;
} else {
// make it the target width, or as small as it can get.
offsets[i] = 0;
spans[i] = Math.max(min, targetSpan);
}
}
}
/**
* Gets the alignment.
*
* @param axis may be either X_AXIS or Y_AXIS
* @return the alignment
*/
public float getAlignment(int axis) {
switch (axis) {
case View.X_AXIS:
return 0;
case View.Y_AXIS:
if (getViewCount() == 0) {
return 0;
}
float span = getPreferredSpan(View.Y_AXIS);
View v = getView(0);
float above = v.getPreferredSpan(View.Y_AXIS);
float a = (((int) span) != 0) ? (above * v.getAlignment(View.Y_AXIS)) / span : 0;
return a;
default:
throw new IllegalArgumentException("Invalid axis: " + axis);
}
}
