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ScaleFrameLayout.javaAPI DocAndroid 5.1 API6640Thu Mar 12 22:22:56 GMT 2015android.support.v17.leanback.widget

ScaleFrameLayout

public class ScaleFrameLayout extends android.widget.FrameLayout
Subclass of FrameLayout that support scale layout area size for children.
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Fields Summary
private static final int
DEFAULT_CHILD_GRAVITY
private float
mLayoutScaleX
private float
mLayoutScaleY
Constructors Summary
public ScaleFrameLayout(android.content.Context context)


       
        this(context ,null);
public ScaleFrameLayout(android.content.Context context, android.util.AttributeSet attrs)

        this(context, attrs, 0);
public ScaleFrameLayout(android.content.Context context, android.util.AttributeSet attrs, int defStyle)

        super(context, attrs, defStyle);
Methods Summary
private static intgetScaledMeasureSpec(int measureSpec, float scale)

        return scale == 1f ? measureSpec : MeasureSpec.makeMeasureSpec(
                (int) (MeasureSpec.getSize(measureSpec) / scale + 0.5f),
                MeasureSpec.getMode(measureSpec));
protected voidonLayout(boolean changed, int left, int top, int right, int bottom)

        final int count = getChildCount();

        final int parentLeft, parentRight;
        final int layoutDirection = getLayoutDirection();
        final float pivotX = (layoutDirection == View.LAYOUT_DIRECTION_RTL) ?
                getWidth() - getPivotX() :
                getPivotX();
        if (mLayoutScaleX != 1f) {
            parentLeft = getPaddingLeft() + (int)(pivotX - pivotX / mLayoutScaleX + 0.5f);
            parentRight = (int)(pivotX + (right - left - pivotX) / mLayoutScaleX + 0.5f)
                    - getPaddingRight();
        } else {
            parentLeft = getPaddingLeft();
            parentRight = right - left - getPaddingRight();
        }

        final int parentTop, parentBottom;
        final float pivotY = getPivotY();
        if (mLayoutScaleY != 1f) {
            parentTop = getPaddingTop() + (int)(pivotY - pivotY / mLayoutScaleY + 0.5f);
            parentBottom = (int)(pivotY + (bottom - top - pivotY) / mLayoutScaleY + 0.5f)
                    - getPaddingBottom();
        } else {
            parentTop = getPaddingTop();
            parentBottom = bottom - top - getPaddingBottom();
        }

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                final LayoutParams lp = (LayoutParams) child.getLayoutParams();

                final int width = child.getMeasuredWidth();
                final int height = child.getMeasuredHeight();

                int childLeft;
                int childTop;

                int gravity = lp.gravity;
                if (gravity == -1) {
                    gravity = DEFAULT_CHILD_GRAVITY;
                }

                final int absoluteGravity = Gravity.getAbsoluteGravity(gravity, layoutDirection);
                final int verticalGravity = gravity & Gravity.VERTICAL_GRAVITY_MASK;

                switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
                    case Gravity.CENTER_HORIZONTAL:
                        childLeft = parentLeft + (parentRight - parentLeft - width) / 2 +
                                lp.leftMargin - lp.rightMargin;
                        break;
                    case Gravity.RIGHT:
                        childLeft = parentRight - width - lp.rightMargin;
                        break;
                    case Gravity.LEFT:
                    default:
                        childLeft = parentLeft + lp.leftMargin;
                }

                switch (verticalGravity) {
                    case Gravity.TOP:
                        childTop = parentTop + lp.topMargin;
                        break;
                    case Gravity.CENTER_VERTICAL:
                        childTop = parentTop + (parentBottom - parentTop - height) / 2 +
                                lp.topMargin - lp.bottomMargin;
                        break;
                    case Gravity.BOTTOM:
                        childTop = parentBottom - height - lp.bottomMargin;
                        break;
                    default:
                        childTop = parentTop + lp.topMargin;
                }

                child.layout(childLeft, childTop, childLeft + width, childTop + height);
                // synchronize child pivot to be same as ScaleFrameLayout's pivot
                child.setPivotX(pivotX - childLeft);
                child.setPivotY(pivotY - childTop);
            }
        }
protected voidonMeasure(int widthMeasureSpec, int heightMeasureSpec)

        if (mLayoutScaleX != 1f || mLayoutScaleY != 1f) {
            final int scaledWidthMeasureSpec =
                    getScaledMeasureSpec(widthMeasureSpec, mLayoutScaleX);
            final int scaledHeightMeasureSpec =
                    getScaledMeasureSpec(heightMeasureSpec, mLayoutScaleY);
            super.onMeasure(scaledWidthMeasureSpec, scaledHeightMeasureSpec);
            setMeasuredDimension((int)(getMeasuredWidth() * mLayoutScaleX + 0.5f),
                    (int)(getMeasuredHeight() * mLayoutScaleY + 0.5f));
        } else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
public voidsetForeground(android.graphics.drawable.Drawable d)
setForeground() is not supported, throws UnsupportedOperationException() when called.

        throw new UnsupportedOperationException();
public voidsetLayoutScaleX(float scaleX)

        if (scaleX != mLayoutScaleX) {
            mLayoutScaleX = scaleX;
            requestLayout();
        }
public voidsetLayoutScaleY(float scaleY)

        if (scaleY != mLayoutScaleY) {
            mLayoutScaleY = scaleY;
            requestLayout();
        }