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/*
* Copyright (C) 2020 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 android.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
/**
* EditText that keeps track of the IME state, specifically its input connection. This is useful
* for clients who request the IME before the system has established a connection.
* @hide
*/
public class ImeAwareEditText extends EditText {
private boolean mHasPendingShowSoftInputRequest;
final Runnable mRunShowSoftInputIfNecessary = () -> showSoftInputIfNecessary();
public ImeAwareEditText(Context context) {
super(context, null);
}
public ImeAwareEditText(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ImeAwareEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public ImeAwareEditText(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
/**
* This method is called back by the system when the system is about to establish a connection
* to the current input method.
*
* <p>This is a good and reliable signal to schedule a pending task to call
* {@link InputMethodManager#showSoftInput(View, int)}.</p>
*
* @param editorInfo context about the text input field.
* @return {@link InputConnection} to be passed to the input method.
*/
@Override
public InputConnection onCreateInputConnection(EditorInfo editorInfo) {
final InputConnection ic = super.onCreateInputConnection(editorInfo);
if (mHasPendingShowSoftInputRequest) {
removeCallbacks(mRunShowSoftInputIfNecessary);
post(mRunShowSoftInputIfNecessary);
}
return ic;
}
private void showSoftInputIfNecessary() {
if (mHasPendingShowSoftInputRequest) {
final InputMethodManager imm =
getContext().getSystemService(InputMethodManager.class);
imm.showSoftInput(this, 0);
mHasPendingShowSoftInputRequest = false;
}
}
public void scheduleShowSoftInput() {
final InputMethodManager imm = getContext().getSystemService(InputMethodManager.class);
if (imm.hasActiveInputConnection(this)) {
// This means that ImeAwareEditText is already connected to the IME.
// InputMethodManager#showSoftInput() is guaranteed to pass client-side focus check.
mHasPendingShowSoftInputRequest = false;
removeCallbacks(mRunShowSoftInputIfNecessary);
imm.showSoftInput(this, 0);
return;
}
// Otherwise, InputMethodManager#showSoftInput() should be deferred after
// onCreateInputConnection().
mHasPendingShowSoftInputRequest = true;
}
}
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