org.chromium.chrome.browser.prerender.ExternalPrerenderHandler Java Examples

public CustomTabObserver(
        Application application, CustomTabsSessionToken session, boolean openedByChrome) {
    if (openedByChrome) {
        mCustomTabsConnection = null;
    } else {
        mCustomTabsConnection = CustomTabsConnection.getInstance(application);
    }
    mSession = session;
    if (!openedByChrome && mCustomTabsConnection.shouldSendNavigationInfoForSession(mSession)) {
        float desiredWidth = application.getResources().getDimensionPixelSize(
                R.dimen.custom_tabs_screenshot_width);
        float desiredHeight = application.getResources().getDimensionPixelSize(
                R.dimen.custom_tabs_screenshot_height);
        Rect bounds = ExternalPrerenderHandler.estimateContentSize(application, false);
        mScaleForNavigationInfo = (bounds.width() == 0 || bounds.height() == 0) ? 1f :
                Math.min(desiredWidth / bounds.width(), desiredHeight / bounds.height());
    }
    mOpenedByChrome = openedByChrome;
    resetPageLoadTracking();
}
 

/**
 * Creates an instance of a {@link Tab} that is fully detached from any activity.
 * Also performs general tab initialization as well as detached specifics.
 *
 * The current application context must allow the creation of a WindowAndroid.
 *
 * @return The newly created and initialized tab.
 */
public static Tab createDetached(TabDelegateFactory delegateFactory) {
    Context context = ContextUtils.getApplicationContext();
    WindowAndroid windowAndroid = new WindowAndroid(context);
    Tab tab = new Tab(INVALID_TAB_ID, INVALID_TAB_ID, false, context, windowAndroid,
            TabLaunchType.FROM_DETACHED, null, null);
    tab.initialize(null, null, delegateFactory, true, false);

    // Resize the webContent to avoid expensive post load resize when attaching the tab.
    Rect bounds = ExternalPrerenderHandler.estimateContentSize((Application) context, false);
    int width = bounds.right - bounds.left;
    int height = bounds.bottom - bounds.top;
    tab.getContentViewCore().onSizeChanged(width, height, 0, 0);

    tab.detach(null, null);
    return tab;
}
 

public CustomTabObserver(
        Application application, CustomTabsSessionToken session, boolean openedByChrome) {
    if (openedByChrome) {
        mCustomTabsConnection = null;
    } else {
        mCustomTabsConnection = CustomTabsConnection.getInstance(application);
    }
    mSession = session;
    if (!openedByChrome && mCustomTabsConnection.shouldSendNavigationInfoForSession(mSession)) {
        float desiredWidth = application.getResources().getDimensionPixelSize(
                R.dimen.custom_tabs_screenshot_width);
        float desiredHeight = application.getResources().getDimensionPixelSize(
                R.dimen.custom_tabs_screenshot_height);
        Rect bounds = ExternalPrerenderHandler.estimateContentSize(application, false);
        if (bounds.width() == 0 || bounds.height() == 0) {
            mContentBitmapWidth = (int) Math.round(desiredWidth);
            mContentBitmapHeight = (int) Math.round(desiredHeight);
        } else {
            // Compute a size that scales the content bitmap to fit one (or both) dimensions,
            // but also preserves aspect ratio.
            float scale =
                    Math.min(desiredWidth / bounds.width(), desiredHeight / bounds.height());
            mContentBitmapWidth = (int) Math.round(bounds.width() * scale);
            mContentBitmapHeight = (int) Math.round(bounds.height() * scale);
        }
    }
    mOpenedByChrome = openedByChrome;
    resetPageLoadTracking();
}
 

/**
 * Called to swap out the current view with the one passed in.
 *
 * @param newContentViewCore The content view that should be swapped into the tab.
 * @param deleteOldNativeWebContents Whether to delete the native web
 *         contents of old view.
 * @param didStartLoad Whether
 *         WebContentsObserver::DidStartProvisionalLoadForFrame() has
 *         already been called.
 * @param didFinishLoad Whether WebContentsObserver::DidFinishLoad() has
 *         already been called.
 */
public void swapContentViewCore(ContentViewCore newContentViewCore,
        boolean deleteOldNativeWebContents, boolean didStartLoad, boolean didFinishLoad) {
    int originalWidth = 0;
    int originalHeight = 0;
    if (mContentViewCore != null) {
        originalWidth = mContentViewCore.getViewportWidthPix();
        originalHeight = mContentViewCore.getViewportHeightPix();
        mContentViewCore.onHide();
    }

    Rect bounds = new Rect();
    if (originalWidth == 0 && originalHeight == 0) {
        bounds = ExternalPrerenderHandler.estimateContentSize(
                (Application) getApplicationContext(), false);
        originalWidth = bounds.right - bounds.left;
        originalHeight = bounds.bottom - bounds.top;
    }

    destroyContentViewCore(deleteOldNativeWebContents);
    NativePage previousNativePage = mNativePage;
    mNativePage = null;
    // Size of the new ContentViewCore is zero at this point. If we don't call onSizeChanged(),
    // next onShow() call would send a resize message with the current ContentViewCore size
    // (zero) to the renderer process, although the new size will be set soon.
    // However, this size fluttering may confuse Blink and rendered result can be broken
    // (see http://crbug.com/340987).
    newContentViewCore.onSizeChanged(originalWidth, originalHeight, 0, 0);
    if (!bounds.isEmpty()) {
        nativeOnPhysicalBackingSizeChanged(mNativeTabAndroid,
                newContentViewCore.getWebContents(), bounds.right, bounds.bottom);
    }
    newContentViewCore.onShow();
    setContentViewCore(newContentViewCore);

    destroyNativePageInternal(previousNativePage);
    for (TabObserver observer : mObservers) {
        observer.onWebContentsSwapped(this, didStartLoad, didFinishLoad);
    }
}
 

/**
 * Called to swap out the current view with the one passed in.
 *
 * @param newContentViewCore The content view that should be swapped into the tab.
 * @param deleteOldNativeWebContents Whether to delete the native web
 *         contents of old view.
 * @param didStartLoad Whether
 *         WebContentsObserver::DidStartProvisionalLoadForFrame() has
 *         already been called.
 * @param didFinishLoad Whether WebContentsObserver::DidFinishLoad() has
 *         already been called.
 */
public void swapContentViewCore(ContentViewCore newContentViewCore,
        boolean deleteOldNativeWebContents, boolean didStartLoad, boolean didFinishLoad) {
    int originalWidth = 0;
    int originalHeight = 0;
    if (mContentViewCore != null) {
        originalWidth = mContentViewCore.getViewportWidthPix();
        originalHeight = mContentViewCore.getViewportHeightPix();
        mContentViewCore.onHide();
    }

    Rect bounds = new Rect();
    if (originalWidth == 0 && originalHeight == 0) {
        bounds = ExternalPrerenderHandler.estimateContentSize(
                (Application) getApplicationContext(), false);
        originalWidth = bounds.right - bounds.left;
        originalHeight = bounds.bottom - bounds.top;
    }

    destroyContentViewCore(deleteOldNativeWebContents);
    NativePage previousNativePage = mNativePage;
    mNativePage = null;
    // Size of the new ContentViewCore is zero at this point. If we don't call onSizeChanged(),
    // next onShow() call would send a resize message with the current ContentViewCore size
    // (zero) to the renderer process, although the new size will be set soon.
    // However, this size fluttering may confuse Blink and rendered result can be broken
    // (see http://crbug.com/340987).
    newContentViewCore.onSizeChanged(originalWidth, originalHeight, 0, 0);
    if (!bounds.isEmpty()) {
        newContentViewCore.onPhysicalBackingSizeChanged(bounds.right, bounds.bottom);
    }
    newContentViewCore.onShow();
    setContentViewCore(newContentViewCore);

    mContentViewCore.attachImeAdapter();

    // If the URL has already committed (e.g. prerendering), tell process management logic that
    // it can rely on the process visibility signal for binding management.
    // TODO: Call ChildProcessLauncher#determinedVisibility() at a more intuitive time.
    // See crbug.com/537671
    if (!mContentViewCore.getWebContents().getLastCommittedUrl().equals("")) {
        ChildProcessLauncher.determinedVisibility(mContentViewCore.getCurrentRenderProcessId());
    }

    destroyNativePageInternal(previousNativePage);
    for (TabObserver observer : mObservers) {
        observer.onWebContentsSwapped(this, didStartLoad, didFinishLoad);
    }
}