77 lines
3.0 KiB
Kotlin
77 lines
3.0 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.utils
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import android.annotation.SuppressLint
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import android.content.Context
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import android.util.AttributeSet
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import android.view.MotionEvent
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import android.view.MotionEvent.ACTION_UP
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import androidx.appcompat.content.res.AppCompatResources
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import androidx.appcompat.widget.AppCompatEditText
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import androidx.core.graphics.BlendModeColorFilterCompat.createBlendModeColorFilterCompat
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import androidx.core.graphics.BlendModeCompat.SRC_IN
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import mozilla.components.support.ktx.android.content.getColorFromAttr
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import mozilla.components.support.ktx.android.view.putCompoundDrawablesRelativeWithIntrinsicBounds
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import org.mozilla.fenix.R
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/**
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* An [AppCompatEditText] that shows a clear button to the user.
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*/
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class ClearableEditText @JvmOverloads constructor(
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context: Context,
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attrs: AttributeSet? = null,
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defStyleAttr: Int = R.attr.editTextStyle
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) :
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AppCompatEditText(context, attrs, defStyleAttr) {
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/**
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* Clears the text when the clear icon is touched.
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*
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* Since the icon is just a compound drawable, we check the tap location
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* to see if the X position of the tap is where the drawable is located.
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*/
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@SuppressLint("ClickableViewAccessibility")
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override fun onTouchEvent(event: MotionEvent): Boolean {
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if (shouldShowClearButton(length()) && event.action == ACTION_UP && event.endDrawableTouched()) {
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setText("")
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return true
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}
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return super.onTouchEvent(event)
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}
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/**
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* Displays a clear icon if text has been entered.
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*/
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override fun onTextChanged(text: CharSequence?, start: Int, lengthBefore: Int, lengthAfter: Int) {
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// lengthAfter has inconsistent behaviour when there are spaces in the entered text, so we'll use text.length.
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val textLength = text?.length ?: 0
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val drawable = if (shouldShowClearButton(textLength)) {
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AppCompatResources.getDrawable(context, R.drawable.ic_clear)?.apply {
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colorFilter = createBlendModeColorFilterCompat(context.getColorFromAttr(R.attr.primaryText), SRC_IN)
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}
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} else {
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null
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}
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putCompoundDrawablesRelativeWithIntrinsicBounds(end = drawable)
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}
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/**
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* Checks if the clear button should be displayed.
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*
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* The button should be displayed if the user has entered valid text.
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* @param length Length of the text the user has entered.
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*/
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private fun shouldShowClearButton(length: Int) =
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length > 0 && error == null
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/**
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* Returns true if the location of the [MotionEvent] is on top of the end drawable.
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*/
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private fun MotionEvent.endDrawableTouched() =
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(layoutDirection == LAYOUT_DIRECTION_LTR && rawX >= (right - compoundPaddingRight)) ||
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(layoutDirection == LAYOUT_DIRECTION_RTL && rawX <= (left + compoundPaddingLeft))
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}
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