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Support CursorAnchorInfo in the full-screen mode

Browse Source 
This CL allows to emulate the behavior of CursorAnchorInfo
in the full-screen mode to work around the limitation of
the framework.

Basically this CL copies relevant code from the framework
to LatinIME. This is actually a code duplicate which isn't
great, but probably the only way that is available right now.

Change-Id: I30bc8c3387c91c8e47252ba699cbd967d8927dad
This commit is contained in:
Yohei Yukawa 2014-09-10 21:02:45 +09:00
parent 486c4894ce
commit cd11905022
3 changed files with 291 additions and 20 deletions
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23
java/src/com/android/inputmethod/keyboard/TextDecorator.java
View File

@ -24,7 +24,6 @@ import android.os.Message;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.CursorAnchorInfo;
import com.android.inputmethod.annotations.UsedForTesting;
import com.android.inputmethod.compat.CursorAnchorInfoCompatWrapper;
@ -154,13 +153,11 @@ public class TextDecorator {
* {@code false} is the input method is finishing the full screen mode.
*/
public void notifyFullScreenMode(final boolean fullScreenMode) {
final boolean currentFullScreenMode = mIsFullScreenMode;
if (!currentFullScreenMode && fullScreenMode) {
// Currently full screen mode is not supported.
// TODO: Support full screen mode.
mUiOperator.hideUi();
}
final boolean fullScreenModeChanged = (mIsFullScreenMode != fullScreenMode);
mIsFullScreenMode = fullScreenMode;
if (fullScreenModeChanged) {
layoutLater();
}
}
/**
@ -183,11 +180,6 @@ public class TextDecorator {
* @param info the compatibility wrapper object for the received {@link CursorAnchorInfo}.
*/
public void onUpdateCursorAnchorInfo(final CursorAnchorInfoCompatWrapper info) {
if (mIsFullScreenMode) {
// TODO: Consider to call InputConnection#requestCursorAnchorInfo to disable the
// event callback to suppress unnecessary event callbacks.
return;
}
mCursorAnchorInfoWrapper = info;
// Do not use layoutLater() to minimize the latency.
layoutImmediately();
@ -240,11 +232,6 @@ public class TextDecorator {
}
private void layoutMain() {
if (mIsFullScreenMode) {
cancelLayoutInternalUnexpectedly("Full screen mode isn't yet supported.");
return;
}
if (mMode != MODE_COMMIT && mMode != MODE_ADD_TO_DICTIONARY) {
if (mMode == MODE_NONE) {
cancelLayoutInternalExpectedly("Not ready for layouting.");
@ -328,7 +315,7 @@ public class TextDecorator {
return;
}
} else {
if (!TextUtils.isEmpty(composingText)) {
if (!mIsFullScreenMode && !TextUtils.isEmpty(composingText)) {
// This is an unexpected case.
// TODO: Document this.
mUiOperator.hideUi();

52
java/src/com/android/inputmethod/latin/LatinIME.java
View File

@ -46,6 +46,7 @@ import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewTreeObserver;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.CompletionInfo;
@ -53,6 +54,7 @@ import android.view.inputmethod.CursorAnchorInfo;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethod;
import android.view.inputmethod.InputMethodSubtype;
import android.widget.TextView;
import com.android.inputmethod.accessibility.AccessibilityUtils;
import com.android.inputmethod.annotations.UsedForTesting;
@ -85,6 +87,7 @@ import com.android.inputmethod.latin.suggestions.SuggestionStripView;
import com.android.inputmethod.latin.suggestions.SuggestionStripViewAccessor;
import com.android.inputmethod.latin.utils.ApplicationUtils;
import com.android.inputmethod.latin.utils.CapsModeUtils;
import com.android.inputmethod.latin.utils.CursorAnchorInfoUtils;
import com.android.inputmethod.latin.utils.CoordinateUtils;
import com.android.inputmethod.latin.utils.DialogUtils;
import com.android.inputmethod.latin.utils.DistracterFilterCheckingExactMatchesAndSuggestions;
@ -152,6 +155,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// TODO: Move these {@link View}s to {@link KeyboardSwitcher}.
private View mInputView;
private SuggestionStripView mSuggestionStripView;
private TextView mExtractEditText;
private RichInputMethodManager mRichImm;
@UsedForTesting final KeyboardSwitcher mKeyboardSwitcher;
@ -757,6 +761,49 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
mInputLogic.setTextDecoratorUi(new TextDecoratorUi(this, view));
}
@Override
public void setExtractView(final View view) {
final TextView prevExtractEditText = mExtractEditText;
super.setExtractView(view);
TextView nextExtractEditText = null;
if (view != null) {
final View extractEditText = view.findViewById(android.R.id.inputExtractEditText);
if (extractEditText instanceof TextView) {
nextExtractEditText = (TextView)extractEditText;
}
}
if (prevExtractEditText == nextExtractEditText) {
return;
}
if (ProductionFlags.ENABLE_CURSOR_ANCHOR_INFO_CALLBACK && prevExtractEditText != null) {
prevExtractEditText.getViewTreeObserver().removeOnPreDrawListener(
mExtractTextViewPreDrawListener);
}
mExtractEditText = nextExtractEditText;
if (ProductionFlags.ENABLE_CURSOR_ANCHOR_INFO_CALLBACK && mExtractEditText != null) {
mExtractEditText.getViewTreeObserver().addOnPreDrawListener(
mExtractTextViewPreDrawListener);
}
}
private final ViewTreeObserver.OnPreDrawListener mExtractTextViewPreDrawListener =
new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
onExtractTextViewPreDraw();
return true;
}
};
private void onExtractTextViewPreDraw() {
if (!ProductionFlags.ENABLE_CURSOR_ANCHOR_INFO_CALLBACK || !isFullscreenMode()
|| mExtractEditText == null) {
return;
}
final CursorAnchorInfo info = CursorAnchorInfoUtils.getCursorAnchorInfo(mExtractEditText);
mInputLogic.onUpdateCursorAnchorInfo(CursorAnchorInfoCompatWrapper.fromObject(info));
}
@Override
public void setCandidatesView(final View view) {
// To ensure that CandidatesView will never be set.
@ -1018,9 +1065,10 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
// We cannot mark this method as @Override until new SDK becomes publicly available.
// @Override
public void onUpdateCursorAnchorInfo(final CursorAnchorInfo info) {
if (ProductionFlags.ENABLE_CURSOR_ANCHOR_INFO_CALLBACK) {
mInputLogic.onUpdateCursorAnchorInfo(CursorAnchorInfoCompatWrapper.fromObject(info));
if (!ProductionFlags.ENABLE_CURSOR_ANCHOR_INFO_CALLBACK || isFullscreenMode()) {
return;
}
mInputLogic.onUpdateCursorAnchorInfo(CursorAnchorInfoCompatWrapper.fromObject(info));
}
/**

236
java/src/com/android/inputmethod/latin/utils/CursorAnchorInfoUtils.java Normal file
View File

@ -0,0 +1,236 @@
/*
* 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.latin.utils;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.inputmethodservice.ExtractEditText;
import android.inputmethodservice.InputMethodService;
import android.text.Layout;
import android.text.Spannable;
import android.view.View;
import android.view.ViewParent;
import android.view.inputmethod.CursorAnchorInfo;
import android.widget.TextView;
/**
* This class allows input methods to extract {@link CursorAnchorInfo} directly from the given
* {@link TextView}. This is useful and even necessary to support full-screen mode where the default
* {@link InputMethodService#onUpdateCursorAnchorInfo(CursorAnchorInfo)} event callback must be
* ignored because it reports the character locations of the target application rather than
* characters on {@link ExtractEditText}.
*/
public final class CursorAnchorInfoUtils {
private CursorAnchorInfoUtils() {
// This helper class is not instantiable.
}
private static boolean isPositionVisible(final View view, final float positionX,
final float positionY) {
final float[] position = new float[] { positionX, positionY };
View currentView = view;
while (currentView != null) {
if (currentView != view) {
// Local scroll is already taken into account in positionX/Y
position[0] -= currentView.getScrollX();
position[1] -= currentView.getScrollY();
}
if (position[0] < 0 || position[1] < 0 ||
position[0] > currentView.getWidth() || position[1] > currentView.getHeight()) {
return false;
}
if (!currentView.getMatrix().isIdentity()) {
currentView.getMatrix().mapPoints(position);
}
position[0] += currentView.getLeft();
position[1] += currentView.getTop();
final ViewParent parent = currentView.getParent();
if (parent instanceof View) {
currentView = (View) parent;
} else {
// We've reached the ViewRoot, stop iterating
currentView = null;
}
}
// We've been able to walk up the view hierarchy and the position was never clipped
return true;
}
/**
* Returns {@link CursorAnchorInfo} from the given {@link TextView}.
* @param textView the target text view from which {@link CursorAnchorInfo} is to be extracted.
* @return the {@link CursorAnchorInfo} object based on the current layout. {@code null} if it
* is not feasible.
*/
public static CursorAnchorInfo getCursorAnchorInfo(final TextView textView) {
Layout layout = textView.getLayout();
if (layout == null) {
return null;
}
final CursorAnchorInfo.Builder builder = new CursorAnchorInfo.Builder();
final int selectionStart = textView.getSelectionStart();
builder.setSelectionRange(selectionStart, textView.getSelectionEnd());
// Construct transformation matrix from view local coordinates to screen coordinates.
final Matrix viewToScreenMatrix = new Matrix(textView.getMatrix());
final int[] viewOriginInScreen = new int[2];
textView.getLocationOnScreen(viewOriginInScreen);
viewToScreenMatrix.postTranslate(viewOriginInScreen[0], viewOriginInScreen[1]);
builder.setMatrix(viewToScreenMatrix);
if (layout.getLineCount() == 0) {
return null;
}
final Rect lineBoundsWithoutOffset = new Rect();
final Rect lineBoundsWithOffset = new Rect();
layout.getLineBounds(0, lineBoundsWithoutOffset);
textView.getLineBounds(0, lineBoundsWithOffset);
final float viewportToContentHorizontalOffset = lineBoundsWithOffset.left
- lineBoundsWithoutOffset.left - textView.getScrollX();
final float viewportToContentVerticalOffset = lineBoundsWithOffset.top
- lineBoundsWithoutOffset.top - textView.getScrollY();
final CharSequence text = textView.getText();
if (text instanceof Spannable) {
// Here we assume that the composing text is marked as SPAN_COMPOSING flag. This is not
// necessarily true, but basically works.
int composingTextStart = text.length();
int composingTextEnd = 0;
final Spannable spannable = (Spannable) text;
final Object[] spans = spannable.getSpans(0, text.length(), Object.class);
for (Object span : spans) {
final int spanFlag = spannable.getSpanFlags(span);
if ((spanFlag & Spannable.SPAN_COMPOSING) != 0) {
composingTextStart = Math.min(composingTextStart,
spannable.getSpanStart(span));
composingTextEnd = Math.max(composingTextEnd, spannable.getSpanEnd(span));
}
}
final boolean hasComposingText =
(0 <= composingTextStart) && (composingTextStart < composingTextEnd);
if (hasComposingText) {
final CharSequence composingText = text.subSequence(composingTextStart,
composingTextEnd);
builder.setComposingText(composingTextStart, composingText);
final int minLine = layout.getLineForOffset(composingTextStart);
final int maxLine = layout.getLineForOffset(composingTextEnd - 1);
for (int line = minLine; line <= maxLine; ++line) {
final int lineStart = layout.getLineStart(line);
final int lineEnd = layout.getLineEnd(line);
final int offsetStart = Math.max(lineStart, composingTextStart);
final int offsetEnd = Math.min(lineEnd, composingTextEnd);
final boolean ltrLine =
layout.getParagraphDirection(line) == Layout.DIR_LEFT_TO_RIGHT;
final float[] widths = new float[offsetEnd - offsetStart];
layout.getPaint().getTextWidths(text, offsetStart, offsetEnd, widths);
final float top = layout.getLineTop(line);
final float bottom = layout.getLineBottom(line);
for (int offset = offsetStart; offset < offsetEnd; ++offset) {
final float charWidth = widths[offset - offsetStart];
final boolean isRtl = layout.isRtlCharAt(offset);
final float primary = layout.getPrimaryHorizontal(offset);
final float secondary = layout.getSecondaryHorizontal(offset);
// TODO: This doesn't work perfectly for text with custom styles and TAB
// chars.
final float left;
final float right;
if (ltrLine) {
if (isRtl) {
left = secondary - charWidth;
right = secondary;
} else {
left = primary;
right = primary + charWidth;
}
} else {
if (!isRtl) {
left = secondary;
right = secondary + charWidth;
} else {
left = primary - charWidth;
right = primary;
}
}
// TODO: Check top-right and bottom-left as well.
final float localLeft = left + viewportToContentHorizontalOffset;
final float localRight = right + viewportToContentHorizontalOffset;
final float localTop = top + viewportToContentVerticalOffset;
final float localBottom = bottom + viewportToContentVerticalOffset;
final boolean isTopLeftVisible = isPositionVisible(textView,
localLeft, localTop);
final boolean isBottomRightVisible =
isPositionVisible(textView, localRight, localBottom);
int characterBoundsFlags = 0;
if (isTopLeftVisible || isBottomRightVisible) {
characterBoundsFlags |= CursorAnchorInfo.FLAG_HAS_VISIBLE_REGION;
}
if (!isTopLeftVisible || !isTopLeftVisible) {
characterBoundsFlags |= CursorAnchorInfo.FLAG_HAS_INVISIBLE_REGION;
}
if (isRtl) {
characterBoundsFlags |= CursorAnchorInfo.FLAG_IS_RTL;
}
// Here offset is the index in Java chars.
builder.addCharacterBounds(offset, localLeft, localTop, localRight,
localBottom, characterBoundsFlags);
}
}
}
}
// Treat selectionStart as the insertion point.
if (0 <= selectionStart) {
final int offset = selectionStart;
final int line = layout.getLineForOffset(offset);
final float insertionMarkerX = layout.getPrimaryHorizontal(offset)
+ viewportToContentHorizontalOffset;
final float insertionMarkerTop = layout.getLineTop(line)
+ viewportToContentVerticalOffset;
final float insertionMarkerBaseline = layout.getLineBaseline(line)
+ viewportToContentVerticalOffset;
final float insertionMarkerBottom = layout.getLineBottom(line)
+ viewportToContentVerticalOffset;
final boolean isTopVisible =
isPositionVisible(textView, insertionMarkerX, insertionMarkerTop);
final boolean isBottomVisible =
isPositionVisible(textView, insertionMarkerX, insertionMarkerBottom);
int insertionMarkerFlags = 0;
if (isTopVisible || isBottomVisible) {
insertionMarkerFlags |= CursorAnchorInfo.FLAG_HAS_VISIBLE_REGION;
}
if (!isTopVisible || !isBottomVisible) {
insertionMarkerFlags |= CursorAnchorInfo.FLAG_HAS_INVISIBLE_REGION;
}
if (layout.isRtlCharAt(offset)) {
insertionMarkerFlags |= CursorAnchorInfo.FLAG_IS_RTL;
}
builder.setInsertionMarkerLocation(insertionMarkerX, insertionMarkerTop,
insertionMarkerBaseline, insertionMarkerBottom, insertionMarkerFlags);
}
return builder.build();
}
}