Example usage for android.view ViewParent getChildVisibleRect

Introduction

In this page you can find the example usage for android.view ViewParent getChildVisibleRect.

Prototype

public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset);

Source Link

Document

Compute the visible part of a rectangular region defined in terms of a child view's coordinates.

Usage

From source file:org.chromium.chrome.browser.ntp.cards.ImpressionTracker.java

@Override
public boolean onPreDraw() {
    ViewParent parent = mView.getParent();
    if (parent != null) {
        Rect rect = new Rect(0, 0, mView.getWidth(), mView.getHeight());
        parent.getChildVisibleRect(mView, rect, null);
        // Track impression if at least one third of the view is visible.
        if (rect.height() >= mView.getHeight() / 3) {
            mTriggered = true;//from  w  w  w  . jav  a 2s  . c  o  m
            mListener.onImpression();
        }
    }
    // Proceed with the current drawing pass.
    return true;
}

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From source file:org.appcelerator.titanium.view.TiUIView.java

/**
 * Animates the view if there are pending animations.
 *///from   ww  w. j ava 2s.  c  om
public void animate() {
    if (nativeView == null) {
        return;
    }

    // Pre-honeycomb, if one animation clobbers another you get a problem whereby the background of the
    // animated view's parent (or the grandparent) bleeds through.  It seems to improve if you cancel and clear
    // the older animation.  So here we cancel and clear, then re-queue the desired animation.
    if (Build.VERSION.SDK_INT < TiC.API_LEVEL_HONEYCOMB) {
        Animation currentAnimation = nativeView.getAnimation();
        if (currentAnimation != null && currentAnimation.hasStarted() && !currentAnimation.hasEnded()) {
            // Cancel existing animation and
            // re-queue desired animation.
            currentAnimation.cancel();
            nativeView.clearAnimation();
            proxy.handlePendingAnimation(true);
            return;
        }

    }

    TiAnimationBuilder builder = proxy.getPendingAnimation();
    if (builder == null) {
        return;
    }

    proxy.clearAnimation(builder);
    AnimationSet as = builder.render(proxy, nativeView);

    // If a view is "visible" but not currently seen (such as because it's covered or
    // its position is currently set to be fully outside its parent's region),
    // then Android might not animate it immediately because by default it animates
    // "on first frame" and apparently "first frame" won't happen right away if the
    // view has no visible rectangle on screen.  In that case invalidate its parent, which will
    // kick off the pending animation.
    boolean invalidateParent = false;
    ViewParent viewParent = nativeView.getParent();

    if (this.visibility == View.VISIBLE && viewParent instanceof View) {
        int width = nativeView.getWidth();
        int height = nativeView.getHeight();

        if (width == 0 || height == 0) {
            // Could be animating from nothing to something
            invalidateParent = true;
        } else {
            Rect r = new Rect(0, 0, width, height);
            Point p = new Point(0, 0);
            invalidateParent = !(viewParent.getChildVisibleRect(nativeView, r, p));
        }
    }

    Log.d(TAG, "starting animation: " + as, Log.DEBUG_MODE);
    nativeView.startAnimation(as);

    if (invalidateParent) {
        ((View) viewParent).postInvalidate();
    }
}

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