ScreensLayout.java

/**
 * Contains multiple {@link ScreenView} in variety of layouts.
 */
public class ScreensLayout extends FrameLayout {
    private static final int DEFAULT_LAYOUT = R.layout.layout_grid_screens;
    /**
     * Actual layout which contains multiple {@link ScreenView}.
     */
    private ViewGroup layout;
    public ScreenView selectedScreen;
    //</editor-fold>

    //<editor-fold desc="Constructors">
    public ScreensLayout(Context context) {
        super(context);
        initialize(context, null, 0);
    }

    public ScreensLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        initialize(context, attrs, 0);
    }

    public ScreensLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initialize(context, attrs, defStyle);
    }
    //</editor-fold>

    private void setViewSelected(ScreenView view) {
        removeViewSelected();

        this.selectedScreen = view;
        Log.i("ScreensLayout", "setViewSelected: " + "Screen (" + ScreensLayout.this.getResources().getResourceEntryName(ScreensLayout.this.selectedScreen.getId()) + ") selected.");
        if (this.selectedScreen != null) {
            // change to a selected background for example
        }
    }

    private ScreenView getViewSelected() {
        if (this.selectedScreen != null) {
            return this.selectedScreen;
        }
        return null;
    }

    private void removeViewSelected() {
        if (this.selectedScreen != null) {
            Log.i("ScreensLayout", "setViewSelected: " + "Screen (" + ScreensLayout.this.getResources().getResourceEntryName(ScreensLayout.this.selectedScreen.getId()) + ") deselected.");
            // remove selected background for example
            this.selectedScreen = null;
        }
        // clear and reset the focus on the parent
        this.layout.clearFocus();
        this.layout.requestFocus();
    }

    private void initialize(final Context context, AttributeSet attributeSet, int defStyleAttr) {
        if (this.isInEditMode()) {
            return;
        }

        this.selectedScreen = null;

        if (attributeSet != null) {
            final TypedArray array = this.getContext().obtainStyledAttributes(
                    attributeSet, R.styleable.ScreenView, defStyleAttr, defStyleAttr);

            changeLayout(context);

            changeSplit(ScreenSplit.valueOf(ScreenSplit.DEFAULT_SPLIT.name()));

            this.layout.setOnFocusChangeListener(new OnFocusChangeListener() {
                @Override
                public void onFocusChange(View v, boolean hasFocus) {
                    ScreenView viewSelected = ScreensLayout.this.getViewSelected();
                    if (viewSelected != null && viewSelected.hasFocus() == false) {
                        ScreensLayout.this.removeViewSelected();
                    }
                    //Log.i("ScreensLayout", "onFocusChange: " + " (" + ScreensLayout.this.getResources().getResourceEntryName(v.getId()) + ") focus = " + hasFocus);
                }
            });

            this.layout.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    ScreensLayout.this.layout.clearFocus();
                    ScreensLayout.this.layout.requestFocus();
                }
            });

            ScreenView child;
            for (int index = 0; index < ScreenSplit.MAX_SPLIT.getScreens(); index++) {
                child = (ScreenView) this.layout.getChildAt(index);
                child.setOnLongClickListener(new OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        ScreenView selectedScreen = ScreensLayout.this.getViewSelected();
                        if (selectedScreen == null || selectedScreen.equals(v) == false) {
                            // whether selected child wasn't long clicked again
                            ScreensLayout.this.setViewSelected((ScreenView) v);
                        }
                        return true;
                    }
                });
                child.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        ScreensLayout.this.removeViewSelected();
                    }
                });
                child.setOnFocusChangeListener(new OnFocusChangeListener() {
                    @Override
                    public void onFocusChange(View v, boolean hasFocus) {
                        //Log.i("ScreensLayout", "onFocusChange child: " + "Screen (" + ScreensLayout.this.getResources().getResourceEntryName(v.getId()) + ") focus = " + hasFocus);
                    }
                });
            }
            array.recycle();
        }
    }
    /**
     * Changes visible screens number in current layout and save it.
     *
     * @param split Requested split.
     */
    public void changeSplit(ScreenSplit split) {
        ScreenView child;

        int index = 0;
        for (; index < split.getScreens(); index++) {
            child = (ScreenView) this.layout.getChildAt(index);
            child.setVisibility(VISIBLE);
        }
        for (; index < this.layout.getChildCount(); index++) {
            child = (ScreenView) this.layout.getChildAt(index);
            child.setVisibility(GONE);
        }
    }

    private void changeLayout(Context context) {
        ViewGroup container = (ViewGroup) LayoutInflater.from(context).inflate(DEFAULT_LAYOUT, this, true);
        this.layout = (ViewGroup) container.getChildAt(0);
    }
}