SystemUI NotificationPanelView展开

NotificationPanelView的父类PanelView的触摸回调函数onTouchEvent中处理了

case MotionEvent.ACTION_MOVE:
trackMovement(event);
float h = y - mInitialTouchY;

// If the panel was collapsed when touching, we only need to check for the
// y-component of the gesture, as we have no conflicting horizontal gesture.
if (Math.abs(h) > mTouchSlop
&& (Math.abs(h) > Math.abs(x - mInitialTouchX)
|| mIgnoreXTouchSlop)) {
mTouchSlopExceeded = true;
if (mGestureWaitForTouchSlop && !mTracking && !mCollapsedAndHeadsUpOnDown) {
if (!mJustPeeked && mInitialOffsetOnTouch != 0f) {
startExpandMotion(x, y, false /* startTracking */, mExpandedHeight);
h = 0;
}
cancelHeightAnimator();
onTrackingStarted();
}
}
float newHeight = Math.max(0, h + mInitialOffsetOnTouch);
if (newHeight > mPeekHeight) {
if (mPeekAnimator != null) {
mPeekAnimator.cancel();
}
mJustPeeked = false;
} else if (mPeekAnimator == null && mJustPeeked) {
// The initial peek has finished, but we haven't dragged as far yet, lets
// speed it up by starting at the peek height.
mInitialOffsetOnTouch = mExpandedHeight;
mInitialTouchY = y;
mMinExpandHeight = mExpandedHeight;
mJustPeeked = false;
}
newHeight = Math.max(newHeight, mMinExpandHeight);
if (-h >= getFalsingThreshold()) {
mTouchAboveFalsingThreshold = true;
mUpwardsWhenTresholdReached = isDirectionUpwards(x, y);
}
if (!mJustPeeked && (!mGestureWaitForTouchSlop || mTracking) &&
!isTrackingBlocked()) {
setExpandedHeightInternal(newHeight);
}
break;

public void setExpandedHeightInternal(float h) {
if (mExpandLatencyTracking && h != 0f) {
DejankUtils.postAfterTraversal(() -> LatencyTracker.getInstance(mContext).onActionEnd(
LatencyTracker.ACTION_EXPAND_PANEL));
mExpandLatencyTracking = false;
}
float fhWithoutOverExpansion = getMaxPanelHeight() - getOverExpansionAmount();
if (mHeightAnimator == null) {
float overExpansionPixels = Math.max(0, h - fhWithoutOverExpansion);
if (getOverExpansionPixels() != overExpansionPixels && mTracking) {
setOverExpansion(overExpansionPixels, true /* isPixels */);
}
mExpandedHeight = Math.min(h, fhWithoutOverExpansion) + getOverExpansionAmount();
} else {
mExpandedHeight = h;
if (mOverExpandedBeforeFling) {
setOverExpansion(Math.max(0, h - fhWithoutOverExpansion), false /* isPixels */);
}
}

// If we are closing the panel and we are almost there due to a slow decelerating
// interpolator, abort the animation.
if (mExpandedHeight < 1f && mExpandedHeight != 0f && mClosing) {
mExpandedHeight = 0f;
if (mHeightAnimator != null) {
mHeightAnimator.end();
}
}
mExpandedFraction = Math.min(1f,
fhWithoutOverExpansion == 0 ? 0 : mExpandedHeight / fhWithoutOverExpansion);
onHeightUpdated(mExpandedHeight);
notifyBarPanelExpansionChanged();
}

回调了NotificationPanelView的onHeightUpdated，将展开的高度作为参数回传

@Override
protected void onHeightUpdated(float expandedHeight) {
if (!mQsExpanded || mQsExpandImmediate || mIsExpanding && mQsExpandedWhenExpandingStarted) {
// Updating the clock position will set the top padding which might
// trigger a new panel height and re-position the clock.
// This is a circular dependency and should be avoided, otherwise we'll have
// a stack overflow.
if (mStackScrollerMeasuringPass > 2) {
if (DEBUG) Log.d(TAG, "Unstable notification panel height. Aborting.");
} else {
positionClockAndNotifications();放置时钟和通知列表
}
}
if (mQsExpandImmediate || mQsExpanded && !mQsTracking && mQsExpansionAnimator == null
&& !mQsExpansionFromOverscroll) {
float t;
if (mKeyguardShowing) {

// On Keyguard, interpolate the QS expansion linearly to the panel expansion
t = expandedHeight / (getMaxPanelHeight());
} else {
// In Shade, interpolate linearly such that QS is closed whenever panel height is
// minimum QS expansion + minStackHeight
float panelHeightQsCollapsed = mNotificationStackScroller.getIntrinsicPadding()
+ mNotificationStackScroller.getLayoutMinHeight();
float panelHeightQsExpanded = calculatePanelHeightQsExpanded();
t = (expandedHeight - panelHeightQsCollapsed)
/ (panelHeightQsExpanded - panelHeightQsCollapsed);
}
setQsExpansion(mQsMinExpansionHeight
+ t * (mQsMaxExpansionHeight - mQsMinExpansionHeight));展开QS
}
updateExpandedHeight(expandedHeight);更新KeyguardBottomAreaAlpha
updateHeader();更新KeyguardStatusBar
updateUnlockIcon();更新UnlockIcon
updateNotificationTranslucency();更新通知透明度
updatePanelExpanded();
mNotificationStackScroller.setShadeExpanded(!isFullyCollapsed());
if (DEBUG) {
invalidate();
}
}

public void setPanelExpanded(boolean isExpanded) {
mPanelExpanded = isExpanded;
updateHideIconsForBouncer(false /* animate */);
mStatusBarWindowManager.setPanelExpanded(isExpanded);
mVisualStabilityManager.setPanelExpanded(isExpanded);
if (isExpanded && getBarState() != StatusBarState.KEYGUARD) {
if (DEBUG) {
Log.v(TAG, "clearing notification effects from setExpandedHeight");
}
clearNotificationEffects();
}

if (!isExpanded) {
mRemoteInputManager.removeRemoteInputEntriesKeptUntilCollapsed();
}
}

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