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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
package org.mozilla.tv.firefox.widget
import android.content.Context
import androidx.appcompat.widget.AppCompatImageButton
import android.util.AttributeSet
import android.view.View
import android.view.accessibility.AccessibilityNodeInfo
import android.widget.CheckBox
import android.widget.Checkable
private val checkedStateSet = intArrayOf(android.R.attr.state_checked)
/**
* ImageButton that implements Checkable.
*
* NB: We need a checkable button with a centered drawable for the overlay.
* CheckBox uses a non-centered drawable, and we can't use ToggleButton
* because it uses android:background to set the image, which we need for button state,
* so we make a custom button.
*
* We need to override onCreateDrawableState (see CompoundButton source) to add
* the checked state to the attrs.
*/
class CheckableImageButton @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyle: Int = 0
) : AppCompatImageButton(context, attrs, defStyle), Checkable {
private var internalIsChecked = false
set(value) {
field = value
refreshDrawableState()
}
override fun isChecked() = internalIsChecked
override fun toggle() {
isChecked = !internalIsChecked
}
override fun setChecked(checked: Boolean) {
internalIsChecked = checked
}
override fun onCreateDrawableState(extraSpace: Int): IntArray {
val drawableState = super.onCreateDrawableState(extraSpace + 1)
if (internalIsChecked) {
View.mergeDrawableStates(drawableState, checkedStateSet)
}
return drawableState
}
override fun performClick(): Boolean {
toggle()
return super.performClick()
}
// The system provides special accessibility announcements based on the value returned
// from this method, e.g. overriding this method is the only difference between CheckBox
// and its CompoundButton super class:
//
// We want to act like a checkbox so we return checkbox here. We also need to update the
// checked state in onInitializeAccessibilityNodeInfo (below).
override fun getAccessibilityClassName(): CharSequence = CheckBox::class.java.name
override fun onInitializeAccessibilityNodeInfo(info: AccessibilityNodeInfo?) {
super.onInitializeAccessibilityNodeInfo(info)
info?.isChecked = isChecked
// Issue #528 - isCheckable is intended to announce checked state on focus, but doesn't
// work with VoiceView
info?.isCheckable = true
}
}