Add FloatLabelEditText
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/*
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* Copyright (C) 2015 Hippo Seven
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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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* 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.hippo.widget;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.os.Build;
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import android.text.Editable;
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import android.text.TextUtils;
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import android.text.TextWatcher;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.widget.EditText;
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import android.widget.FrameLayout;
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import android.widget.TextView;
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import com.hippo.ehviewer.R;
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import com.nineoldandroids.animation.Animator;
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import com.nineoldandroids.animation.AnimatorListenerAdapter;
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import com.nineoldandroids.animation.ObjectAnimator;
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// Get code from https://gist.github.com/jromero/233cfd8ef22a8b8c29ea
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/**
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* Layout which an {@link android.widget.EditText} to show a floating label when the hint is hidden
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* due to the user inputting text.
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*
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* @see <a href="https://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction">Matt D. Smith on Dribble</a>
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* @see <a href="http://bradfrostweb.com/blog/post/float-label-pattern/">Brad Frost's blog post</a>
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*/
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public class FloatLabelEditText extends FrameLayout {
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private static final long ANIMATION_DURATION = 150;
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private static final Trigger[] sTriggerArray = {
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Trigger.TEXT,
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Trigger.FOCUS
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};
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private TextView mLabel;
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private EditText mEditText;
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private Trigger mTrigger = Trigger.TEXT;
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private String mHint;
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public FloatLabelEditText(Context context, AttributeSet attrs) {
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super(context, attrs);
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init(context, attrs, 0);
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}
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public FloatLabelEditText(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init(context, attrs, defStyleAttr);
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}
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private void init(Context context, AttributeSet attrs, int defStyleAttr) {
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mLabel = new TextView(context);
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mLabel.setVisibility(View.INVISIBLE);
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final TypedArray a = context
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.obtainStyledAttributes(attrs, R.styleable.FloatLabelEditText);
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mLabel.setTextAppearance(context,
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a.getResourceId(R.styleable.FloatLabelEditText_fllLabelAppearance,
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android.R.style.TextAppearance_Small));
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mHint = a.getString(R.styleable.FloatLabelEditText_fllHint);
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final int index = a.getInt(R.styleable.FloatLabelEditText_fllTrigger, -1);
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if (index >= 0) {
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setTrigger(sTriggerArray[index]);
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}
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a.recycle();
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addView(mLabel, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
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mEditText = (EditText) LayoutInflater.from(getContext()).inflate(
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R.layout.widget_float_label_edit_text, this, false);
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final LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
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lp.gravity = Gravity.BOTTOM;
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lp.topMargin = (int) mLabel.getTextSize();
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addView(mEditText, lp);
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mEditText.setHint(mHint);
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mLabel.setText(mHint);
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// Add a TextWatcher so that we know when the text input has changed
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mEditText.addTextChangedListener(mTextWatcher);
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// Add focus listener to the EditText so that we can notify the label that it is activated.
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// Allows the use of a ColorStateList for the text color on the label
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mEditText.setOnFocusChangeListener(mOnFocusChangeListener);
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// Align with label and edittext
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mLabel.setPadding(mEditText.getPaddingLeft(), 0, 0, 0);
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}
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public void setTrigger(Trigger trigger) {
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mTrigger = trigger;
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}
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/**
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* Show the label using an animation
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*/
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protected void showLabel() {
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if (mLabel.getVisibility() != View.VISIBLE) {
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mLabel.setVisibility(View.VISIBLE);
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final ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(mLabel, "alpha",
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0f, 1f);
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alphaAnim.setAutoCancel(true);
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alphaAnim.setDuration(ANIMATION_DURATION);
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final ObjectAnimator translationYAnim = ObjectAnimator.ofFloat(mLabel,
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"translationY", mLabel.getHeight(), 0f);
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translationYAnim.setAutoCancel(true);
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translationYAnim.setDuration(ANIMATION_DURATION);
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alphaAnim.start();
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translationYAnim.start();
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}
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}
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/**
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* Hide the label using an animation
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*/
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protected void hideLabel() {
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if (mLabel.getVisibility() != View.GONE) {
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final ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(mLabel, "alpha",
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1f, 0f);
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alphaAnim.setAutoCancel(true);
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alphaAnim.setDuration(ANIMATION_DURATION);
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final ObjectAnimator translationYAnim = ObjectAnimator.ofFloat(mLabel,
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"translationY", 0f, mLabel.getHeight());
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translationYAnim.setAutoCancel(true);
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translationYAnim.setDuration(ANIMATION_DURATION);
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translationYAnim.addListener(new AnimatorListenerAdapter() {
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@Override
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public void onAnimationEnd(Animator animation) {
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mLabel.setVisibility(View.GONE);
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}
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});
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alphaAnim.start();
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translationYAnim.start();
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}
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}
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private TextWatcher mTextWatcher = new TextWatcher() {
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@Override
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public void afterTextChanged(Editable s) {
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// Only takes affect if mTrigger is set to TEXT
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if (mTrigger != Trigger.TEXT) {
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return;
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}
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if (TextUtils.isEmpty(s)) {
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hideLabel();
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} else {
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showLabel();
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}
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}
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@Override
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public void beforeTextChanged(CharSequence s, int start, int count, int after) {
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// Empty
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}
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@Override
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public void onTextChanged(CharSequence s, int start, int before, int count) {
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// Empty
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}
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};
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private OnFocusChangeListener mOnFocusChangeListener = new OnFocusChangeListener() {
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@TargetApi(Build.VERSION_CODES.HONEYCOMB)
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@Override
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public void onFocusChange(View view, boolean focused) {
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
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mLabel.setActivated(focused);
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}
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if (mTrigger != Trigger.FOCUS) {
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return;
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}
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if (focused) {
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mEditText.setHint("");
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showLabel();
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} else {
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mEditText.setHint(mHint);
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hideLabel();
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}
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}
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};
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/**
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* Options for trigger to show a floating label
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*/
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public enum Trigger {
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/**
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* Active the trigger when input text
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*/
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TEXT (0),
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/**
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* Active the trigger when get focus
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*/
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FOCUS (1);
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Trigger(int ni) {
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nativeInt = ni;
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}
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final int nativeInt;
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}
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}
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