android.view.SurfaceControl#mergeToGlobalTransaction ( )源码实例Demo

private boolean updateVisibility() {
    if (mHiddenForCrop || mHiddenForOtherReasons) {
        if (mSurfaceShown) {
            hideSurface(mTmpTransaction);
            SurfaceControl.mergeToGlobalTransaction(mTmpTransaction);
        }
        return false;
    } else {
        if (!mSurfaceShown) {
            return showSurface();
        } else {
            return true;
        }
    }
}
 

private void applySurfaceChangesTransaction(boolean recoveringMemory, int defaultDw,
        int defaultDh) {
    mHoldScreenWindow = null;
    mObscuringWindow = null;

    // TODO(multi-display): Support these features on secondary screens.
    if (mService.mWatermark != null) {
        mService.mWatermark.positionSurface(defaultDw, defaultDh);
    }
    if (mService.mStrictModeFlash != null) {
        mService.mStrictModeFlash.positionSurface(defaultDw, defaultDh);
    }
    if (mService.mCircularDisplayMask != null) {
        mService.mCircularDisplayMask.positionSurface(defaultDw, defaultDh,
                mService.getDefaultDisplayRotation());
    }
    if (mService.mEmulatorDisplayOverlay != null) {
        mService.mEmulatorDisplayOverlay.positionSurface(defaultDw, defaultDh,
                mService.getDefaultDisplayRotation());
    }

    boolean focusDisplayed = false;

    final int count = mChildren.size();
    for (int j = 0; j < count; ++j) {
        final DisplayContent dc = mChildren.get(j);
        focusDisplayed |= dc.applySurfaceChangesTransaction(recoveringMemory);
    }

    if (focusDisplayed) {
        mService.mH.sendEmptyMessage(REPORT_LOSING_FOCUS);
    }

    // Give the display manager a chance to adjust properties like display rotation if it needs
    // to.
    mService.mDisplayManagerInternal.performTraversal(mDisplayTransaction);
    SurfaceControl.mergeToGlobalTransaction(mDisplayTransaction);
}
 

/**
 * TODO: Once we totally eliminate global transaction we will pass transaction in here
 * rather than merging to global.
 */
void prepareSurfaces() {
    SurfaceControl.mergeToGlobalTransaction(getPendingTransaction());

    // If a leash has been set when the transaction was committed, then the leash reparent has
    // been committed.
    mCommittedReparentToAnimationLeash = mSurfaceAnimator.hasLeash();
    for (int i = 0; i < mChildren.size(); i++) {
        mChildren.get(i).prepareSurfaces();
    }
}
 

void hide(String reason) {
    hide(mTmpTransaction, reason);
    SurfaceControl.mergeToGlobalTransaction(mTmpTransaction);
}