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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.dialer.widget;
import android.app.Activity;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.support.annotation.DrawableRes;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.FloatingActionButton.OnVisibilityChangedListener;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import com.android.dialer.common.Assert;
/** Controls the movement and appearance of the FAB (Floating Action Button). */
public class FloatingActionButtonController {
public static final int ALIGN_MIDDLE = 0;
public static final int ALIGN_QUARTER_END = 1;
public static final int ALIGN_END = 2;
private final int animationDuration;
private final int floatingActionButtonWidth;
private final int floatingActionButtonMarginRight;
private final FloatingActionButton fab;
private final Interpolator fabInterpolator;
private int fabIconId = -1;
private int screenWidth;
public FloatingActionButtonController(Activity activity, FloatingActionButton fab) {
Resources resources = activity.getResources();
fabInterpolator =
AnimationUtils.loadInterpolator(activity, android.R.interpolator.fast_out_slow_in);
floatingActionButtonWidth =
resources.getDimensionPixelSize(R.dimen.floating_action_button_width);
floatingActionButtonMarginRight =
resources.getDimensionPixelOffset(R.dimen.floating_action_button_margin_right);
animationDuration = resources.getInteger(R.integer.floating_action_button_animation_duration);
this.fab = fab;
}
/**
* Passes the screen width into the class. Necessary for translation calculations. Should be
* called as soon as parent View width is available.
*
* @param screenWidth The width of the screen in pixels.
*/
public void setScreenWidth(int screenWidth) {
this.screenWidth = screenWidth;
}
/** @see FloatingActionButton#isShown() */
public boolean isVisible() {
return fab.isShown();
}
/**
* Sets FAB as shown or hidden.
*
* @see #scaleIn()
* @see #scaleOut()
*/
public void setVisible(boolean visible) {
if (visible) {
scaleIn();
} else {
scaleOut();
}
}
public void changeIcon(Context context, @DrawableRes int iconId, String description) {
if (this.fabIconId != iconId) {
fab.setImageResource(iconId);
fab.setImageTintList(
ColorStateList.valueOf(context.getResources().getColor(android.R.color.white)));
this.fabIconId = iconId;
}
if (!fab.getContentDescription().equals(description)) {
fab.setContentDescription(description);
}
}
/**
* Updates the FAB location (middle to right position) as the PageView scrolls.
*
* @param positionOffset A fraction used to calculate position of the FAB during page scroll.
*/
public void onPageScrolled(float positionOffset) {
// As the page is scrolling, if we're on the first tab, update the FAB position so it
// moves along with it.
fab.setTranslationX(positionOffset * getTranslationXForAlignment(ALIGN_END));
}
/**
* Aligns the FAB to the described location
*
* @param align One of ALIGN_MIDDLE, ALIGN_QUARTER_RIGHT, or ALIGN_RIGHT.
* @param animate Whether or not to animate the transition.
*/
public void align(int align, boolean animate) {
align(align, 0 /*offsetX */, 0 /* offsetY */, animate);
}
/**
* Aligns the FAB to the described location plus specified additional offsets.
*
* @param align One of ALIGN_MIDDLE, ALIGN_QUARTER_RIGHT, or ALIGN_RIGHT.
* @param offsetX Additional offsetX to translate by.
* @param offsetY Additional offsetY to translate by.
* @param animate Whether or not to animate the transition.
*/
private void align(int align, int offsetX, int offsetY, boolean animate) {
if (screenWidth == 0) {
return;
}
int translationX = getTranslationXForAlignment(align);
// Skip animation if container is not shown; animation causes container to show again.
if (animate && fab.isShown()) {
fab.animate()
.translationX(translationX + offsetX)
.translationY(offsetY)
.setInterpolator(fabInterpolator)
.setDuration(animationDuration)
.start();
} else {
fab.setTranslationX(translationX + offsetX);
fab.setTranslationY(offsetY);
}
}
/** @see FloatingActionButton#show() */
public void scaleIn() {
fab.show();
}
/** @see FloatingActionButton#hide() */
public void scaleOut() {
fab.hide();
}
public void scaleOut(OnVisibilityChangedListener listener) {
fab.hide(listener);
}
/**
* Calculates the X offset of the FAB to the given alignment, adjusted for whether or not the view
* is in RTL mode.
*
* @param align One of ALIGN_MIDDLE, ALIGN_QUARTER_RIGHT, or ALIGN_RIGHT.
* @return The translationX for the given alignment.
*/
private int getTranslationXForAlignment(int align) {
int result;
switch (align) {
case ALIGN_MIDDLE:
// Moves the FAB to exactly center screen.
return 0;
case ALIGN_QUARTER_END:
// Moves the FAB a quarter of the screen width.
result = screenWidth / 4;
break;
case ALIGN_END:
// Moves the FAB half the screen width. Same as aligning right with a marginRight.
result = screenWidth / 2 - floatingActionButtonWidth / 2 - floatingActionButtonMarginRight;
break;
default:
throw Assert.createIllegalStateFailException("Invalid alignment value: " + align);
}
if (isLayoutRtl()) {
result *= -1;
}
return result;
}
private boolean isLayoutRtl() {
return fab.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
}
}
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