@Override
public void destroy() {
mTabSaver.destroy();
mUma.destroy();
super.destroy();
mActiveState = false;
}
@Override
public void requestToShowTab(Tab tab, TabSelectionType type) {
boolean isFromExternalApp =
tab != null && tab.getLaunchType() == TabLaunchType.FROM_EXTERNAL_APP;
if (mVisibleTab != tab && tab != null && !tab.isNativePage()) {
TabModelBase.startTabSwitchLatencyTiming(type);
}
if (mVisibleTab != null && mVisibleTab != tab && !mVisibleTab.needsReload()) {
if (mVisibleTab.isInitialized()) {
// TODO(dtrainor): Once we figure out why we can't grab a snapshot from the current
// tab when we have other tabs loading from external apps remove the checks for
// FROM_EXTERNAL_APP/FROM_NEW.
if (!mVisibleTab.isClosing() && (!isFromExternalApp || type != TabSelectionType.FROM_NEW)) {
cacheTabBitmap(mVisibleTab);
}
mVisibleTab.hide();
mVisibleTab.setFullscreenManager(null);
mTabSaver.addTabToSaveQueue(mVisibleTab);
}
mVisibleTab = null;
}
if (tab == null) {
notifyChanged();
return;
}
// We hit this case when the user enters tab switcher and comes back to the current tab
// without actual tab switch.
if (mVisibleTab == tab && !mVisibleTab.isHidden()) {
// The current tab might have been killed by the os while in tab switcher.
tab.loadIfNeeded();
return;
}
tab.setFullscreenManager(mActivity.getFullscreenManager());
mVisibleTab = tab;
// Don't execute the tab display part if Chrome has just been sent to background. This
// avoids uneccessary work (tab restore) and prevents pollution of tab display metrics - see
// http://crbug.com/316166.
if (type != TabSelectionType.FROM_EXIT) {
tab.show(type);
mUma.onShowTab(tab.getId(), tab.isBeingRestored());
}
}
/** Should be called when the app starts showing a view with multiple tabs. */
public void onTabsViewShown() {
mUma.onTabsViewShown();
}
