protected LoadingLayout createLoadingLayout(Context context, Mode mode, TypedArray attrs) {
LoadingLayout layout =
mLoadingAnimationStyle.createLoadingLayout(
context, mode, getPullToRefreshScrollDirection(), attrs);
layout.setVisibility(View.INVISIBLE);
return layout;
}
/**
* Updates the View State when the mode has been set. This does not do any checking that the mode
* is different to current state so always updates.
*/
protected void updateUIForMode() {
// We need to use the correct LayoutParam values, based on scroll
// direction
final LayoutParams lp = getLoadingLayoutLayoutParams();
// Remove Header, and then add Header Loading View again if needed
if (this == mHeaderLayout.getParent()) {
removeView(mHeaderLayout);
}
if (mMode.showHeaderLoadingLayout()) {
addViewInternal(mHeaderLayout, 0, lp);
}
// Remove Footer, and then add Footer Loading View again if needed
if (this == mFooterLayout.getParent()) {
removeView(mFooterLayout);
}
if (mMode.showFooterLoadingLayout()) {
addViewInternal(mFooterLayout, lp);
}
// Hide Loading Views
refreshLoadingViewsSize();
// If we're not using Mode.BOTH, set mCurrentMode to mMode, otherwise
// set it to pull down
mCurrentMode = (mMode != Mode.BOTH) ? mMode : Mode.PULL_FROM_START;
}
/**
* Called when the UI has been to be updated to be in the {@link
* com.minglang.pulltorefreshlibrary.PullToRefreshBase.State#RESET} state.
*/
protected void onReset() {
mIsBeingDragged = false;
mLayoutVisibilityChangesEnabled = true;
// Always reset both layouts, just in case...
mHeaderLayout.reset();
mFooterLayout.reset();
smoothScrollTo(0);
}
/**
* Called when the UI has been to be updated to be in the {@link
* com.minglang.pulltorefreshlibrary.PullToRefreshBase.State#RELEASE_TO_REFRESH} state.
*/
protected void onReleaseToRefresh() {
switch (mCurrentMode) {
case PULL_FROM_END:
mFooterLayout.releaseToRefresh();
break;
case PULL_FROM_START:
mHeaderLayout.releaseToRefresh();
break;
default:
// NO-OP
break;
}
}
/** Re-measure the Loading Views height, and adjust internal padding as necessary */
protected final void refreshLoadingViewsSize() {
final int maximumPullScroll = (int) (getMaximumPullScroll() * 1.2f);
int pLeft = getPaddingLeft();
int pTop = getPaddingTop();
int pRight = getPaddingRight();
int pBottom = getPaddingBottom();
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
if (mMode.showHeaderLoadingLayout()) {
mHeaderLayout.setWidth(maximumPullScroll);
pLeft = -maximumPullScroll;
} else {
pLeft = 0;
}
if (mMode.showFooterLoadingLayout()) {
mFooterLayout.setWidth(maximumPullScroll);
pRight = -maximumPullScroll;
} else {
pRight = 0;
}
break;
case VERTICAL:
if (mMode.showHeaderLoadingLayout()) {
mHeaderLayout.setHeight(maximumPullScroll);
pTop = -maximumPullScroll;
} else {
pTop = 0;
}
if (mMode.showFooterLoadingLayout()) {
mFooterLayout.setHeight(maximumPullScroll);
pBottom = -maximumPullScroll;
} else {
pBottom = 0;
}
break;
}
if (DEBUG) {
Log.d(
LOG_TAG,
String.format(
"Setting Padding. L: %d, T: %d, R: %d, B: %d", pLeft, pTop, pRight, pBottom));
}
setPadding(pLeft, pTop, pRight, pBottom);
}
/**
* Actions a Pull Event
*
* @return true if the Event has been handled, false if there has been no change
*/
private void pullEvent() {
final int newScrollValue;
final int itemDimension;
final float initialMotionValue, lastMotionValue;
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
initialMotionValue = mInitialMotionX;
lastMotionValue = mLastMotionX;
break;
case VERTICAL:
default:
initialMotionValue = mInitialMotionY;
lastMotionValue = mLastMotionY;
break;
}
switch (mCurrentMode) {
case PULL_FROM_END:
newScrollValue = Math.round(Math.max(initialMotionValue - lastMotionValue, 0) / FRICTION);
itemDimension = getFooterSize();
break;
case PULL_FROM_START:
default:
newScrollValue = Math.round(Math.min(initialMotionValue - lastMotionValue, 0) / FRICTION);
itemDimension = getHeaderSize();
break;
}
setHeaderScroll(newScrollValue);
if (newScrollValue != 0 && !isRefreshing()) {
float scale = Math.abs(newScrollValue) / (float) itemDimension;
switch (mCurrentMode) {
case PULL_FROM_END:
mFooterLayout.onPull(scale);
break;
case PULL_FROM_START:
default:
mHeaderLayout.onPull(scale);
break;
}
if (mState != State.PULL_TO_REFRESH && itemDimension >= Math.abs(newScrollValue)) {
setState(State.PULL_TO_REFRESH);
} else if (mState == State.PULL_TO_REFRESH && itemDimension < Math.abs(newScrollValue)) {
setState(State.RELEASE_TO_REFRESH);
}
}
}
/**
* Helper method which just calls scrollTo() in the correct scrolling direction.
*
* @param value - New Scroll value
*/
protected final void setHeaderScroll(int value) {
if (DEBUG) {
Log.d(LOG_TAG, "setHeaderScroll: " + value);
}
// Clamp value to with pull scroll range
final int maximumPullScroll = getMaximumPullScroll();
value = Math.min(maximumPullScroll, Math.max(-maximumPullScroll, value));
if (mLayoutVisibilityChangesEnabled) {
if (value < 0) {
mHeaderLayout.setVisibility(View.VISIBLE);
} else if (value > 0) {
mFooterLayout.setVisibility(View.VISIBLE);
} else {
mHeaderLayout.setVisibility(View.INVISIBLE);
mFooterLayout.setVisibility(View.INVISIBLE);
}
}
if (USE_HW_LAYERS) {
/**
* Use a Hardware Layer on the Refreshable View if we've scrolled at all. We don't use them on
* the Header/Footer Views as they change often, which would negate any HW layer performance
* boost.
*/
ViewCompat.setLayerType(
mRefreshableViewWrapper, value != 0 ? View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE);
}
switch (getPullToRefreshScrollDirection()) {
case VERTICAL:
scrollTo(0, value);
break;
case HORIZONTAL:
scrollTo(value, 0);
break;
}
}
/**
* Called when the UI has been to be updated to be in the {@link
* com.minglang.pulltorefreshlibrary.PullToRefreshBase.State#REFRESHING} or {@link
* com.minglang.pulltorefreshlibrary.PullToRefreshBase.State#MANUAL_REFRESHING} state.
*
* @param doScroll - Whether the UI should scroll for this event.
*/
protected void onRefreshing(final boolean doScroll) {
if (mMode.showHeaderLoadingLayout()) {
mHeaderLayout.refreshing();
}
if (mMode.showFooterLoadingLayout()) {
mFooterLayout.refreshing();
}
if (doScroll) {
if (mShowViewWhileRefreshing) {
// Call Refresh Listener when the Scroll has finished
OnSmoothScrollFinishedListener listener =
new OnSmoothScrollFinishedListener() {
@Override
public void onSmoothScrollFinished() {
callRefreshListener();
}
};
switch (mCurrentMode) {
case MANUAL_REFRESH_ONLY:
case PULL_FROM_END:
smoothScrollTo(getFooterSize(), listener);
break;
default:
case PULL_FROM_START:
smoothScrollTo(-getHeaderSize(), listener);
break;
}
} else {
smoothScrollTo(0);
}
} else {
// We're not scrolling, so just call Refresh Listener now
callRefreshListener();
}
}
protected final int getHeaderSize() {
return mHeaderLayout.getContentSize();
}
protected final int getFooterSize() {
return mFooterLayout.getContentSize();
}