107 lines
3.3 KiB
Java
107 lines
3.3 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email.activity;
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import android.animation.Animator;
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import android.animation.ObjectAnimator;
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import android.animation.PropertyValuesHolder;
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import android.animation.TimeInterpolator;
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import android.content.Context;
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import android.view.ViewGroup;
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import android.view.animation.DecelerateInterpolator;
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import android.widget.TextView;
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/**
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* Class to hide/show a banner.
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*/
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public class BannerController {
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private static final int ANIMATION_DURATION = 100;
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private static final TimeInterpolator INTERPOLATOR = new DecelerateInterpolator(1.5f);
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private final TextView mBannerView;
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private final int mBannerHeight;
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private boolean mShown;
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/** Hold last animator to cancel. */
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private Animator mLastAnimator;
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public BannerController(Context context, TextView bannerView, int bannerHeight) {
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mBannerView = bannerView;
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mBannerHeight = bannerHeight;
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setBannerYAnim(-mBannerHeight); // hide by default.
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}
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/**
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* @return the current y position of the banner.
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*/
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private int getBannerY() {
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return ((ViewGroup.MarginLayoutParams) mBannerView.getLayoutParams()).topMargin;
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}
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private static final String PROP_SET_BANNER_Y = "bannerYAnim";
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/**
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* Set the Y position of the banner. public, but should only be used by animators.
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*/
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public void setBannerYAnim(int y) {
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((ViewGroup.MarginLayoutParams) mBannerView.getLayoutParams()).topMargin = y;
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mBannerView.requestLayout();
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}
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/**
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* Show a banner with a message.
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*
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* @return false if a banner is already shown, in which case the message won't be updated.
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*/
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public boolean show(String message) {
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if (mShown) {
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return false; // If already shown, don't change the message, to avoid flicker.
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}
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mShown = true;
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mBannerView.setText(message);
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slideBanner(0);
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return true;
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}
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/**
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* Dismiss a banner.
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*/
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public void dismiss() {
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if (!mShown) {
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return; // Always hidden, or hiding.
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}
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mShown = false;
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slideBanner(-mBannerHeight); // Slide up to hide.
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}
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private void slideBanner(int toY) {
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if (mLastAnimator != null) {
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mLastAnimator.cancel();
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}
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final PropertyValuesHolder[] values = {
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PropertyValuesHolder.ofInt(PROP_SET_BANNER_Y, getBannerY(), toY) };
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final ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(
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this, values).setDuration(ANIMATION_DURATION);
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animator.setInterpolator(INTERPOLATOR);
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mLastAnimator = animator;
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animator.start();
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}
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}
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