// This callback is automatically executed on the UI thread.
@Override
public void onTabChanged(final Tab tab, final Tabs.TabEvents msg, final Object data) {
switch (msg) {
case CLOSED:
// Remove any doorhangers for a tab when it's closed (make
// a temporary set to avoid a ConcurrentModificationException)
HashSet<DoorHanger> doorHangersToRemove = new HashSet<DoorHanger>();
for (DoorHanger dh : mDoorHangers) {
if (dh.getTabId() == tab.getId()) doorHangersToRemove.add(dh);
}
for (DoorHanger dh : doorHangersToRemove) {
removeDoorHanger(dh);
}
break;
case LOCATION_CHANGE:
// Only remove doorhangers if the popup is hidden or if we're navigating to a new URL
if (!isShowing() || !data.equals(tab.getURL())) removeTransientDoorHangers(tab.getId());
// Update the popup if the location change was on the current tab
if (Tabs.getInstance().isSelectedTab(tab)) updatePopup();
break;
case SELECTED:
// Always update the popup when a new tab is selected. This will cover cases
// where a different tab was closed, since we always need to select a new tab.
updatePopup();
break;
}
}
/**
* Gets a doorhanger.
*
* <p>This method must be called on the UI thread.
*/
DoorHanger getDoorHanger(int tabId, String value) {
for (DoorHanger dh : mDoorHangers) {
if (dh.getTabId() == tabId && dh.getValue().equals(value)) return dh;
}
// If there's no doorhanger for the given tabId and value, return null
return null;
}
/**
* Removes doorhangers for a given tab.
*
* <p>This method must be called on the UI thread.
*/
void removeTransientDoorHangers(int tabId) {
// Make a temporary set to avoid a ConcurrentModificationException
HashSet<DoorHanger> doorHangersToRemove = new HashSet<DoorHanger>();
for (DoorHanger dh : mDoorHangers) {
// Only remove transient doorhangers for the given tab
if (dh.getTabId() == tabId && dh.shouldRemove(isShowing())) doorHangersToRemove.add(dh);
}
for (DoorHanger dh : doorHangersToRemove) {
removeDoorHanger(dh);
}
}
/**
* Updates the popup state.
*
* <p>This method must be called on the UI thread.
*/
void updatePopup() {
// Bail if the selected tab is null, if there are no active doorhangers,
// if we haven't inflated the layout yet (this can happen if updatePopup()
// is called before the runnable from addDoorHanger() runs), or if the
// doorhanger popup is temporarily disabled.
Tab tab = Tabs.getInstance().getSelectedTab();
if (tab == null || mDoorHangers.size() == 0 || !mInflated || mDisabled) {
dismiss();
return;
}
// Show doorhangers for the selected tab
int tabId = tab.getId();
boolean shouldShowPopup = false;
for (DoorHanger dh : mDoorHangers) {
if (dh.getTabId() == tabId) {
dh.setVisibility(View.VISIBLE);
shouldShowPopup = true;
} else {
dh.setVisibility(View.GONE);
}
}
// Dismiss the popup if there are no doorhangers to show for this tab
if (!shouldShowPopup) {
dismiss();
return;
}
showDividers();
if (isShowing()) {
show();
return;
}
// Make the popup focusable for accessibility. This gets done here
// so the node can be accessibility focused, but on pre-ICS devices this
// causes crashes, so it is done after the popup is shown.
if (Build.VERSION.SDK_INT >= 14) {
setFocusable(true);
}
show();
if (Build.VERSION.SDK_INT < 14) {
// Make the popup focusable for keyboard accessibility.
setFocusable(true);
}
}