onGlobalLayout ( )源码实例Demo

android.view.ViewTreeObserver.OnGlobalLayoutListener#onGlobalLayout ( )源码实例Demo

下面列出了android.view.ViewTreeObserver.OnGlobalLayoutListener#onGlobalLayout ( ) 实例代码,或者点击链接到github查看源代码,也可以在右侧发表评论。

/**
 * Inflates the view, which is used to visualize a specific item.
 *
 * @param item
 *         The item, whose view should be inflated, as an instance of the class {@link
 *         AbstractItem}. The item may not be null
 * @param listener
 *         The layout listener, which should be notified, when the view has been inflated, as an
 *         instance of the type {@link OnGlobalLayoutListener} or null, if no listener should be
 *         notified
 * @param params
 *         An array, which contains optional parameters, which should be passed to the view
 *         recycler, which is used to inflate the view, as an {@link Integer} array or null, if
 *         no optional parameters should be used
 */
protected final void inflateView(@NonNull final AbstractItem item,
                                 @Nullable final OnGlobalLayoutListener listener,
                                 @NonNull final Integer... params) {
    Pair<View, Boolean> pair = getTabViewRecycler().inflate(item, params);

    if (listener != null) {
        boolean inflated = pair.second;

        if (inflated) {
            View view = pair.first;
            view.getViewTreeObserver()
                    .addOnGlobalLayoutListener(new LayoutListenerWrapper(view, listener));
        } else {
            listener.onGlobalLayout();
        }
    }
}
 
/**
 * Inflates the content, which is associated with a specific tab.
 *
 * @param tab
 *         The tab, whose content should be inflated, as an instance of the class {@link Tab}.
 *         The tab may not be null
 * @param listener
 *         The layout listener, which should be notified, when the view has been inflated, as an
 *         instance of the type {@link OnGlobalLayoutListener} or null, if no listener should be
 *         notified
 */
private void inflateContent(@NonNull final Tab tab,
                            @Nullable final OnGlobalLayoutListener listener) {
    Pair<View, Boolean> pair = contentViewRecycler.inflate(tab);
    View view = pair.first;

    if (listener != null) {
        boolean inflated = pair.second;

        if (inflated) {
            view.getViewTreeObserver()
                    .addOnGlobalLayoutListener(new LayoutListenerWrapper(view, listener));
        } else {
            listener.onGlobalLayout();
        }
    }
}
 
/**
 * Creates and returns a layout listener, which allows to adapt the size and position of an
 * item, once its view has been inflated.
 *
 * @param item
 *         The item, whose view should be adapted, as an instance of the class {@link
 *         AbstractItem}. The item may not be null
 * @param dragging
 *         True, if the item is currently being dragged, false otherwise
 * @param layoutListener
 *         The layout lister, which should be notified, when the created listener is invoked, as
 *         an instance of the type {@link OnGlobalLayoutListener} or null, if no listener should
 *         be notified
 * @return The layout listener, which has been created, as an instance of the type {@link
 * OnGlobalLayoutListener}. The layout listener may not be null
 */
@NonNull
private OnGlobalLayoutListener createInflateViewLayoutListener(@NonNull final AbstractItem item,
                                                               final boolean dragging,
                                                               @Nullable final OnGlobalLayoutListener layoutListener) {
    return new OnGlobalLayoutListener() {

        @Override
        public void onGlobalLayout() {
            updateView(item, dragging);

            if (layoutListener != null) {
                layoutListener.onGlobalLayout();
            }
        }

    };
}
 
/**
 * Creates and returns a layout listener, which allows to adapt the size and position of a tab,
 * once its view has been inflated.
 *
 * @param item
 *         The item, which corresponds to the tab, whose view should be adapted, as an instance
 *         of the class {@link AbstractItem}. The item may not be null
 * @param dragging
 *         True, if the item is currently being dragged, false otherwise
 * @param layoutListener
 *         The layout lister, which should be notified, when the created listener is invoked, as
 *         an instance of the type {@link OnGlobalLayoutListener} or null, if no listener should
 *         be notified
 * @return The layout listener, which has been created, as an instance of the type {@link
 * OnGlobalLayoutListener}. The layout listener may not be null
 */
@NonNull
private OnGlobalLayoutListener createInflateViewLayoutListener(@NonNull final AbstractItem item,
                                                               final boolean dragging,
                                                               @Nullable final OnGlobalLayoutListener layoutListener) {
    return new OnGlobalLayoutListener() {

        @Override
        public void onGlobalLayout() {
            adaptViewSize(item);
            updateView(item, dragging);

            if (layoutListener != null) {
                layoutListener.onGlobalLayout();
            }
        }

    };
}
 
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