/**
* Updates the position, scale, rotation and alpha values of mAnimatedTab.
*
* @param discard The value that specify how far along are we in the discard animation. 0 is
* filling the screen. Valid values are [-range .. range] where range is computed by {@link
* SimpleAnimationLayout#getDiscardRange()}.
*/
private void setDiscardAmount(float discard) {
if (mAnimatedTab != null) {
final float range = getDiscardRange();
final float scale = Stack.computeDiscardScale(discard, range, true);
final float deltaX = mAnimatedTab.getOriginalContentWidth();
final float deltaY = mAnimatedTab.getOriginalContentHeight() / 2.f;
mAnimatedTab.setX(deltaX * (1.f - scale));
mAnimatedTab.setY(deltaY * (1.f - scale));
mAnimatedTab.setScale(scale);
mAnimatedTab.setBorderScale(scale);
mAnimatedTab.setAlpha(Stack.computeDiscardAlpha(discard, range));
}
}
/**
* Creates the Base Page's LayoutTab to be presented in the screen.
*
* @param layoutTab The {@link Layout} instance.
*/
private void createBaseLayoutTab(LayoutTab layoutTab) {
if (mTabModelSelector == null) return;
int baseTabId = mTabModelSelector.getCurrentTabId();
if (baseTabId == Tab.INVALID_TAB_ID) return;
mBaseTab =
createLayoutTab(
baseTabId, mTabModelSelector.isIncognitoSelected(), NO_CLOSE_BUTTON, NO_TITLE);
assert mBaseTab != null;
mBaseTab.setScale(1.f);
mBaseTab.setBorderScale(1.f);
mBaseTab.setBorderAlpha(0.f);
mLayoutTabs = new LayoutTab[] {mBaseTab};
}