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<?xml version="1.0" encoding="utf-8"?>

<resources>

    <style name="TextAppearance.YourApp.FloatLabel" parent="android:TextAppearance.Small">
        <item name="android:textColor">@color/float_label</item>
        <item name="android:textSize">11sp</item>
        <item name="android:textStyle">bold</item>
    </style>

</resources>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <your.package.FloatLabelLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:floatLabelTextAppearance="@style/TextAppearance.YourApp.FloatLabel">

        <EditText
            android:id="@+id/edit_username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/account_username_hint"
            android:singleLine="true"
            android:inputType="textNoSuggestions"
            android:imeOptions="actionNext"
            android:nextFocusDown="@+id/edit_password" />

    </your.package.FloatLabelLayout>

    <your.package.FloatLabelLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            app:floatLabelTextAppearance="@style/TextAppearance.YourApp.FloatLabel">

        <EditText
            android:id="@+id/edit_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/account_password_hint"
            android:singleLine="true"
            android:inputType="textNoSuggestions"
            android:imeOptions="actionDone" />

    </your.package.FloatLabelLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- The color when activated/focused (usually your app's accent color) -->
    <item android:color="..." android:state_activated="true" />

    <!-- The color when not activated/focused (usually grey) -->
    <item android:color="..." />

</selector>

<!-- 
    Copyright (C) 2014 Chris Banes

    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.
-->

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="FloatLabelLayout">
        <attr name="floatLabelTextAppearance" format="reference" />
        <attr name="floatLabelSidePadding" format="reference|dimension" />
    </declare-styleable>

</resources>

/*
 * Copyright (C) 2014 Chris Banes
 *
 * 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.
 */

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.content.res.TypedArray;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TextView;

/**
 * Layout which an {@link android.widget.EditText} to show a floating label when the hint is hidden
 * due to the user inputting text.
 *
 * @see <a href="https://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction">Matt D. Smith on Dribble</a>
 * @see <a href="http://bradfrostweb.com/blog/post/float-label-pattern/">Brad Frost's blog post</a>
 */
public final class FloatLabelLayout extends FrameLayout {

    private static final long ANIMATION_DURATION = 150;

    private static final float DEFAULT_PADDING_LEFT_RIGHT_DP = 12f;

    private EditText mEditText;
    private TextView mLabel;

    public FloatLabelLayout(Context context) {
        this(context, null);
    }

    public FloatLabelLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FloatLabelLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        final TypedArray a = context
                .obtainStyledAttributes(attrs, R.styleable.FloatLabelLayout);

        final int sidePadding = a.getDimensionPixelSize(
                R.styleable.FloatLabelLayout_floatLabelSidePadding,
                dipsToPix(DEFAULT_PADDING_LEFT_RIGHT_DP));
        mLabel = new TextView(context);
        mLabel.setPadding(sidePadding, 0, sidePadding, 0);
        mLabel.setVisibility(INVISIBLE);

        mLabel.setTextAppearance(context,
                a.getResourceId(R.styleable.FloatLabelLayout_floatLabelTextAppearance,
                        android.R.style.TextAppearance_Small));

        addView(mLabel, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

        a.recycle();
    }

    @Override
    public final void addView(View child, int index, ViewGroup.LayoutParams params) {
        if (child instanceof EditText) {
            // If we already have an EditText, throw an exception
            if (mEditText != null) {
                throw new IllegalArgumentException("We already have an EditText, can only have one");
            }

            // Update the layout params so that the EditText is at the bottom, with enough top
            // margin to show the label
            final LayoutParams lp = new LayoutParams(params);
            lp.gravity = Gravity.BOTTOM;
            lp.topMargin = (int) mLabel.getTextSize();
            params = lp;

            setEditText((EditText) child);
        }

        // Carry on adding the View...
        super.addView(child, index, params);
    }

    private void setEditText(EditText editText) {
        mEditText = editText;

        // Add a TextWatcher so that we know when the text input has changed
        mEditText.addTextChangedListener(new TextWatcher() {

            @Override
            public void afterTextChanged(Editable s) {
                if (TextUtils.isEmpty(s)) {
                    // The text is empty, so hide the label if it is visible
                    if (mLabel.getVisibility() == View.VISIBLE) {
                        hideLabel();
                    }
                } else {
                    // The text is not empty, so show the label if it is not visible
                    if (mLabel.getVisibility() != View.VISIBLE) {
                        showLabel();
                    }
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }

        });

        // Add focus listener to the EditText so that we can notify the label that it is activated.
        // Allows the use of a ColorStateList for the text color on the label
        mEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean focused) {
                mLabel.setActivated(focused);
            }
        });

        mLabel.setText(mEditText.getHint());
    }

    /**
     * @return the {@link android.widget.EditText} text input
     */
    public EditText getEditText() {
        return mEditText;
    }

    /**
     * @return the {@link android.widget.TextView} label
     */
    public TextView getLabel() {
        return mLabel;
    }

    /**
     * Show the label using an animation
     */
    private void showLabel() {
        mLabel.setVisibility(View.VISIBLE);
        mLabel.setAlpha(0f);
        mLabel.setTranslationY(mLabel.getHeight());
        mLabel.animate()
                .alpha(1f)
                .translationY(0f)
                .setDuration(ANIMATION_DURATION)
                .setListener(null).start();
    }

    /**
     * Hide the label using an animation
     */
    private void hideLabel() {
        mLabel.setAlpha(1f);
        mLabel.setTranslationY(0f);
        mLabel.animate()
                .alpha(0f)
                .translationY(mLabel.getHeight())
                .setDuration(ANIMATION_DURATION)
                .setListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        mLabel.setVisibility(View.GONE);
                    }
                }).start();
    }

    /**
     * Helper method to convert dips to pixels.
     */
    private int dipsToPix(float dps) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dps,
                getResources().getDisplayMetrics());
    }
}