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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.util.Log;
import android.view.inputmethod.InputConnection;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
public final class InputConnectionCompatUtils {
private static final String TAG = InputConnectionCompatUtils.class.getSimpleName();
// 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;
}
/**
* Local copies of some constants in CursorAnchorInfoRequest until the SDK becomes publicly
* available.
*/
private final static int RESULT_NOT_HANDLED = 0;
private final static int RESULT_SCHEDULED = 1;
private final static int TYPE_CURSOR_ANCHOR_INFO = 1;
private final static int FLAG_CURSOR_ANCHOR_INFO_MONITOR = 1;
private final static int FLAG_CURSOR_ANCHOR_INFO_IMMEDIATE = 2;
private final static int TYPE_CURSOR_RECT = 2;
private final static int FLAG_CURSOR_RECT_MONITOR = 1;
private final static int FLAG_CURSOR_RECT_IN_SCREEN_COORDINATES = 2;
private final static int FLAG_CURSOR_RECT_WITH_VIEW_MATRIX = 4;
private static int requestCursorAnchorInfoImpl(final InputConnection inputConnection,
final int type, final int flags) {
if (!isRequestCursorAnchorInfoAvailable()) {
return RESULT_NOT_HANDLED;
}
final Object requestObject = CompatUtils.newInstance(
CONSTRUCTOR_CursorAnchorInfoRequest, type, flags);
if (requestObject == null) {
return RESULT_NOT_HANDLED;
}
return (Integer) CompatUtils.invoke(inputConnection,
RESULT_NOT_HANDLED /* defaultValue */,
METHOD_requestCursorAnchorInfo, requestObject);
}
/**
* Requests the editor to call back {@link InputMethodManager#updateCursorAnchorInfo}.
* @param inputConnection the input connection to which the request is to be sent.
* @param enableMonitor {@code true} to request the editor to call back the method whenever the
* cursor/anchor position is changed.
* @param requestImmediateCallback {@code true} to request the editor to call back the method
* as soon as possible to notify the current cursor/anchor position to the input method.
* @return {@code false} if the request is not handled. Otherwise returns {@code true}.
*/
public static boolean requestCursorAnchorInfo(final InputConnection inputConnection,
final boolean enableMonitor, final boolean requestImmediateCallback) {
final int requestFlags = (enableMonitor ? FLAG_CURSOR_ANCHOR_INFO_MONITOR : 0)
| (requestImmediateCallback ? FLAG_CURSOR_ANCHOR_INFO_IMMEDIATE : 0);
final int requestResult = requestCursorAnchorInfoImpl(inputConnection,
TYPE_CURSOR_ANCHOR_INFO, requestFlags);
switch (requestResult) {
case RESULT_NOT_HANDLED:
return false;
case RESULT_SCHEDULED:
return true;
default:
Log.w(TAG, "requestCursorAnchorInfo returned unknown result=" + requestResult
+ " for type=TYPE_CURSOR_ANCHOR_INFO flags=" + requestFlags);
return true;
}
}
/**
* Requests the editor to call back {@link InputMethodManager#updateCursor}.
* @param inputConnection the input connection to which the request is to be sent.
* @param enableMonitor {@code true} to request the editor to call back the method whenever the
* cursor position is changed.
* @return {@code false} if the request is not handled. Otherwise returns {@code true}.
*/
public static boolean requestCursorRect(final InputConnection inputConnection,
final boolean enableMonitor) {
final int requestFlags = enableMonitor ?
FLAG_CURSOR_RECT_MONITOR | FLAG_CURSOR_RECT_IN_SCREEN_COORDINATES |
FLAG_CURSOR_RECT_WITH_VIEW_MATRIX : 0;
final int requestResult = requestCursorAnchorInfoImpl(inputConnection, TYPE_CURSOR_RECT,
requestFlags);
switch (requestResult) {
case RESULT_NOT_HANDLED:
return false;
case RESULT_SCHEDULED:
return true;
default:
Log.w(TAG, "requestCursorAnchorInfo returned unknown result=" + requestResult
+ " for type=TYPE_CURSOR_RECT flags=" + requestFlags);
return true;
}
}
}
|
