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/*
* Copyright (C) 2014 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 com.android.inputmethod.compat;
import android.view.inputmethod.InputConnection;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
public final class InputConnectionCompatUtils {
// Note that CursorAnchorInfoRequest is supposed to be available in API level 21 and later.
private static Class<?> getCursorAnchorInfoRequestClass() {
try {
return Class.forName("android.view.inputmethod.CursorAnchorInfoRequest");
} catch (ClassNotFoundException e) {
return null;
}
}
private static final Class<?> TYPE_CursorAnchorInfoRequest;
private static final Constructor<?> CONSTRUCTOR_CursorAnchorInfoRequest;
private static final Method METHOD_requestCursorAnchorInfo;
static {
TYPE_CursorAnchorInfoRequest = getCursorAnchorInfoRequestClass();
CONSTRUCTOR_CursorAnchorInfoRequest = CompatUtils.getConstructor(
TYPE_CursorAnchorInfoRequest, int.class, int.class);
METHOD_requestCursorAnchorInfo = CompatUtils.getMethod(InputConnection.class,
"requestCursorAnchorInfo", TYPE_CursorAnchorInfoRequest);
}
public static boolean isRequestCursorAnchorInfoAvailable() {
return METHOD_requestCursorAnchorInfo != null &&
CONSTRUCTOR_CursorAnchorInfoRequest != null;
}
/**
* A local copy of CursorAnchorInfoRequest.RESULT_NOT_HANDLED until the SDK becomes publicly
* available.
*/
private final static int CURSOR_ANCHOR_INFO_REQUEST_RESULT_NOT_HANDLED = 0;
public static int requestCursorAnchorInfo(final InputConnection inputConnection,
final int type, final int flags) {
if (!isRequestCursorAnchorInfoAvailable()) {
return CURSOR_ANCHOR_INFO_REQUEST_RESULT_NOT_HANDLED;
}
final Object requestObject = CompatUtils.newInstance(
CONSTRUCTOR_CursorAnchorInfoRequest, type, flags);
if (requestObject == null) {
return CURSOR_ANCHOR_INFO_REQUEST_RESULT_NOT_HANDLED;
}
return (Integer) CompatUtils.invoke(inputConnection,
CURSOR_ANCHOR_INFO_REQUEST_RESULT_NOT_HANDLED /* defaultValue */,
METHOD_requestCursorAnchorInfo, requestObject);
}
}
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