Java tutorial
/* * Copyright (C) 2011 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.github.crvv.wubinput.wubi.dictionary.suggestions; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Color; import android.support.v4.view.ViewCompat; import android.text.TextUtils; import android.util.AttributeSet; import android.util.TypedValue; import android.view.GestureDetector; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnLongClickListener; import android.view.ViewGroup; import android.view.ViewParent; import android.view.accessibility.AccessibilityEvent; import android.widget.RelativeLayout; import android.widget.TextView; import com.github.crvv.wubinput.accessibility.AccessibilityUtils; import com.github.crvv.wubinput.keyboard.Keyboard; import com.github.crvv.wubinput.keyboard.MainKeyboardView; import com.github.crvv.wubinput.keyboard.MoreKeysPanel; import com.github.crvv.wubinput.wubi.AudioAndHapticFeedbackManager; import com.github.crvv.wubinput.wubi.Constants; import com.github.crvv.wubinput.wubi.R; import com.github.crvv.wubinput.wubi.dictionary.SuggestedWords; import com.github.crvv.wubinput.wubi.dictionary.SuggestedWords.SuggestedWordInfo; import com.github.crvv.wubinput.wubi.define.DebugFlags; import com.github.crvv.wubinput.wubi.dictionary.suggestions.MoreSuggestionsView.MoreSuggestionsListener; import com.github.crvv.wubinput.wubi.utils.ImportantNoticeUtils; import java.util.ArrayList; public final class SuggestionStripView extends RelativeLayout implements OnClickListener, OnLongClickListener { public interface Listener { void pickSuggestionManually(SuggestedWordInfo word); void onCodeInput(int primaryCode, int x, int y, boolean isKeyRepeat); } static final boolean DBG = DebugFlags.DEBUG_ENABLED; private static final float DEBUG_INFO_TEXT_SIZE_IN_DIP = 6.0f; private final ViewGroup mSuggestionsStrip; MainKeyboardView mMainKeyboardView; private final View mMoreSuggestionsContainer; private final MoreSuggestionsView mMoreSuggestionsView; private final MoreSuggestions.Builder mMoreSuggestionsBuilder; private final ArrayList<TextView> mWordViews = new ArrayList<>(); private final ArrayList<View> mDividerViews = new ArrayList<>(); Listener mListener; private SuggestedWords mSuggestedWords = SuggestedWords.EMPTY; private int mStartIndexOfMoreSuggestions; private final SuggestionStripLayoutHelper mLayoutHelper; private final StripVisibilityGroup mStripVisibilityGroup; private static class StripVisibilityGroup { private final View mSuggestionStripView; private final View mSuggestionsStrip; private final View mImportantNoticeStrip; public StripVisibilityGroup(final View suggestionStripView, final ViewGroup suggestionsStrip, final ViewGroup addToDictionaryStrip, final View importantNoticeStrip) { mSuggestionStripView = suggestionStripView; mSuggestionsStrip = suggestionsStrip; mImportantNoticeStrip = importantNoticeStrip; showSuggestionsStrip(); } public void setLayoutDirection(final boolean isRtlLanguage) { final int layoutDirection = isRtlLanguage ? ViewCompat.LAYOUT_DIRECTION_RTL : ViewCompat.LAYOUT_DIRECTION_LTR; ViewCompat.setLayoutDirection(mSuggestionStripView, layoutDirection); ViewCompat.setLayoutDirection(mSuggestionsStrip, layoutDirection); } public void showSuggestionsStrip() { mSuggestionsStrip.setVisibility(VISIBLE); } public void showImportantNoticeStrip() { mSuggestionsStrip.setVisibility(INVISIBLE); mImportantNoticeStrip.setVisibility(VISIBLE); } } /** * Construct a {@link SuggestionStripView} for showing suggestions to be picked by the user. * @param context * @param attrs */ public SuggestionStripView(final Context context, final AttributeSet attrs) { this(context, attrs, R.attr.suggestionStripViewStyle); } public SuggestionStripView(final Context context, final AttributeSet attrs, final int defStyle) { super(context, attrs, defStyle); final LayoutInflater inflater = LayoutInflater.from(context); inflater.inflate(R.layout.suggestions_strip, this); mSuggestionsStrip = (ViewGroup) findViewById(R.id.suggestions_strip); mStripVisibilityGroup = new StripVisibilityGroup(this, mSuggestionsStrip, null, null); for (int pos = 0; pos < SuggestedWords.MAX_SUGGESTIONS; pos++) { final TextView word = new TextView(context, null, R.attr.suggestionWordStyle); word.setOnClickListener(this); word.setOnLongClickListener(this); mWordViews.add(word); final View divider = inflater.inflate(R.layout.suggestion_divider, null); mDividerViews.add(divider); final TextView info = new TextView(context, null, R.attr.suggestionWordStyle); info.setTextColor(Color.WHITE); info.setTextSize(TypedValue.COMPLEX_UNIT_DIP, DEBUG_INFO_TEXT_SIZE_IN_DIP); } mLayoutHelper = new SuggestionStripLayoutHelper(context, attrs, defStyle, mWordViews, mDividerViews, null); mMoreSuggestionsContainer = inflater.inflate(R.layout.more_suggestions, null); mMoreSuggestionsView = (MoreSuggestionsView) mMoreSuggestionsContainer .findViewById(R.id.more_suggestions_view); mMoreSuggestionsBuilder = new MoreSuggestions.Builder(context, mMoreSuggestionsView); final Resources res = context.getResources(); mMoreSuggestionsModalTolerance = res .getDimensionPixelOffset(R.dimen.config_more_suggestions_modal_tolerance); mMoreSuggestionsSlidingDetector = new GestureDetector(context, mMoreSuggestionsSlidingListener); final TypedArray keyboardAttr = context.obtainStyledAttributes(attrs, R.styleable.Keyboard, defStyle, R.style.SuggestionStripView); keyboardAttr.recycle(); } /** * A connection back to the input method. * @param listener */ public void setListener(final Listener listener, final View inputView) { mListener = listener; mMainKeyboardView = (MainKeyboardView) inputView.findViewById(R.id.keyboard_view); } public void updateVisibility(final boolean shouldBeVisible, final boolean isFullscreenMode) { final int visibility = shouldBeVisible ? VISIBLE : (isFullscreenMode ? GONE : INVISIBLE); setVisibility(visibility); } public void setSuggestions(final SuggestedWords suggestedWords, final boolean isRtlLanguage) { clear(); mStripVisibilityGroup.setLayoutDirection(isRtlLanguage); mSuggestedWords = suggestedWords; mStartIndexOfMoreSuggestions = mLayoutHelper.layoutAndReturnStartIndexOfMoreSuggestions(mSuggestedWords, mSuggestionsStrip, this); mStripVisibilityGroup.showSuggestionsStrip(); } public void setMoreSuggestionsHeight(final int remainingHeight) { mLayoutHelper.setMoreSuggestionsHeight(remainingHeight); } // This method checks if we should show the important notice (checks on permanent storage if // it has been shown once already or not, and if in the setup wizard). If applicable, it shows // the notice. In all cases, it returns true if it was shown, false otherwise. public boolean maybeShowImportantNoticeTitle() { if (!ImportantNoticeUtils.shouldShowImportantNotice(getContext())) { return false; } if (getWidth() <= 0) { return false; } final String importantNoticeTitle = ImportantNoticeUtils.getNextImportantNoticeTitle(getContext()); if (TextUtils.isEmpty(importantNoticeTitle)) { return false; } if (isShowingMoreSuggestionPanel()) { dismissMoreSuggestionsPanel(); } mStripVisibilityGroup.showImportantNoticeStrip(); return true; } public void clear() { mSuggestionsStrip.removeAllViews(); mStripVisibilityGroup.showSuggestionsStrip(); dismissMoreSuggestionsPanel(); } private final MoreSuggestionsListener mMoreSuggestionsListener = new MoreSuggestionsListener() { @Override public void onSuggestionSelected(final SuggestedWordInfo wordInfo) { mListener.pickSuggestionManually(wordInfo); dismissMoreSuggestionsPanel(); } @Override public void onCancelInput() { dismissMoreSuggestionsPanel(); } }; private final MoreKeysPanel.Controller mMoreSuggestionsController = new MoreKeysPanel.Controller() { @Override public void onDismissMoreKeysPanel() { mMainKeyboardView.onDismissMoreKeysPanel(); } @Override public void onShowMoreKeysPanel(final MoreKeysPanel panel) { mMainKeyboardView.onShowMoreKeysPanel(panel); } @Override public void onCancelMoreKeysPanel() { dismissMoreSuggestionsPanel(); } }; public boolean isShowingMoreSuggestionPanel() { return mMoreSuggestionsView.isShowingInParent(); } public void dismissMoreSuggestionsPanel() { mMoreSuggestionsView.dismissMoreKeysPanel(); } @Override public boolean onLongClick(final View view) { AudioAndHapticFeedbackManager.getInstance().performHapticAndAudioFeedback(Constants.NOT_A_CODE, this); return showMoreSuggestions(); } boolean showMoreSuggestions() { final Keyboard parentKeyboard = mMainKeyboardView.getKeyboard(); if (parentKeyboard == null) { return false; } final SuggestionStripLayoutHelper layoutHelper = mLayoutHelper; if (mSuggestedWords.size() <= mStartIndexOfMoreSuggestions) { return false; } // Dismiss another {@link MoreKeysPanel} that may be being showed, for example // {@link MoreKeysKeyboardView}. mMainKeyboardView.onDismissMoreKeysPanel(); // Dismiss all key previews and sliding key input preview that may be being showed. mMainKeyboardView.dismissAllKeyPreviews(); mMainKeyboardView.dismissSlidingKeyInputPreview(); final int stripWidth = getWidth(); final View container = mMoreSuggestionsContainer; final int maxWidth = stripWidth - container.getPaddingLeft() - container.getPaddingRight(); final MoreSuggestions.Builder builder = mMoreSuggestionsBuilder; builder.layout(mSuggestedWords, mStartIndexOfMoreSuggestions, maxWidth, (int) (maxWidth * layoutHelper.mMinMoreSuggestionsWidth), layoutHelper.getMaxMoreSuggestionsRow(), parentKeyboard); mMoreSuggestionsView.setKeyboard(builder.build()); container.measure(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); final MoreKeysPanel moreKeysPanel = mMoreSuggestionsView; final int pointX = stripWidth / 2; final int pointY = -layoutHelper.mMoreSuggestionsBottomGap; moreKeysPanel.showMoreKeysPanel(this, mMoreSuggestionsController, pointX, pointY, mMoreSuggestionsListener); mOriginX = mLastX; mOriginY = mLastY; for (int i = 0; i < mStartIndexOfMoreSuggestions; i++) { mWordViews.get(i).setPressed(false); } return true; } // Working variables for {@link onInterceptTouchEvent(MotionEvent)} and // {@link onTouchEvent(MotionEvent)}. private int mLastX; private int mLastY; private int mOriginX; private int mOriginY; private final int mMoreSuggestionsModalTolerance; private boolean mNeedsToTransformTouchEventToHoverEvent; private boolean mIsDispatchingHoverEventToMoreSuggestions; private final GestureDetector mMoreSuggestionsSlidingDetector; private final GestureDetector.OnGestureListener mMoreSuggestionsSlidingListener = new GestureDetector.SimpleOnGestureListener() { @Override public boolean onScroll(MotionEvent down, MotionEvent me, float deltaX, float deltaY) { final float dy = me.getY() - down.getY(); if (deltaY > 0 && dy < 0) { return showMoreSuggestions(); } return false; } }; @Override public boolean onInterceptTouchEvent(final MotionEvent me) { if (!mMoreSuggestionsView.isShowingInParent()) { mLastX = (int) me.getX(); mLastY = (int) me.getY(); return mMoreSuggestionsSlidingDetector.onTouchEvent(me); } final int action = me.getAction(); final int index = me.getActionIndex(); final int x = (int) me.getX(index); final int y = (int) me.getY(index); if (Math.abs(x - mOriginX) >= mMoreSuggestionsModalTolerance || mOriginY - y >= mMoreSuggestionsModalTolerance) { // Decided to be in the sliding suggestion mode only when the touch point has been moved // upward. Further {@link MotionEvent}s will be delivered to // {@link #onTouchEvent(MotionEvent)}. mNeedsToTransformTouchEventToHoverEvent = AccessibilityUtils.getInstance().isTouchExplorationEnabled(); mIsDispatchingHoverEventToMoreSuggestions = false; return true; } if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_POINTER_UP) { // Decided to be in the modal input mode. mMoreSuggestionsView.adjustVerticalCorrectionForModalMode(); } return false; } @Override public boolean dispatchPopulateAccessibilityEvent(final AccessibilityEvent event) { // Don't populate accessibility event with suggested words and voice key. return true; } @Override public boolean onTouchEvent(final MotionEvent me) { // In the sliding input mode. {@link MotionEvent} should be forwarded to // {@link MoreSuggestionsView}. final int index = me.getActionIndex(); final int x = mMoreSuggestionsView.translateX((int) me.getX(index)); final int y = mMoreSuggestionsView.translateY((int) me.getY(index)); me.setLocation(x, y); if (!mNeedsToTransformTouchEventToHoverEvent) { mMoreSuggestionsView.onTouchEvent(me); return true; } // In sliding suggestion mode with accessibility mode on, a touch event should be // transformed to a hover event. final int width = mMoreSuggestionsView.getWidth(); final int height = mMoreSuggestionsView.getHeight(); final boolean onMoreSuggestions = (x >= 0 && x < width && y >= 0 && y < height); if (!onMoreSuggestions && !mIsDispatchingHoverEventToMoreSuggestions) { // Just drop this touch event because dispatching hover event isn't started yet and // the touch event isn't on {@link MoreSuggestionsView}. return true; } final int hoverAction; if (onMoreSuggestions && !mIsDispatchingHoverEventToMoreSuggestions) { // Transform this touch event to a hover enter event and start dispatching a hover // event to {@link MoreSuggestionsView}. mIsDispatchingHoverEventToMoreSuggestions = true; hoverAction = MotionEvent.ACTION_HOVER_ENTER; } else if (me.getActionMasked() == MotionEvent.ACTION_UP) { // Transform this touch event to a hover exit event and stop dispatching a hover event // after this. mIsDispatchingHoverEventToMoreSuggestions = false; mNeedsToTransformTouchEventToHoverEvent = false; hoverAction = MotionEvent.ACTION_HOVER_EXIT; } else { // Transform this touch event to a hover move event. hoverAction = MotionEvent.ACTION_HOVER_MOVE; } me.setAction(hoverAction); mMoreSuggestionsView.onHoverEvent(me); return true; } @Override public void onClick(final View view) { AudioAndHapticFeedbackManager.getInstance().performHapticAndAudioFeedback(Constants.CODE_UNSPECIFIED, this); final Object tag = view.getTag(); // {@link Integer} tag is set at // {@link SuggestionStripLayoutHelper#setupWordViewsTextAndColor(SuggestedWords,int)} and // {@link SuggestionStripLayoutHelper#layoutPunctuationSuggestions(SuggestedWords,ViewGroup} if (tag instanceof Integer) { final int index = (Integer) tag; if (index >= mSuggestedWords.size()) { return; } final SuggestedWordInfo wordInfo = mSuggestedWords.getInfo(index); mListener.pickSuggestionManually(wordInfo); } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); dismissMoreSuggestionsPanel(); } @Override protected void onSizeChanged(final int w, final int h, final int oldw, final int oldh) { // Called by the framework when the size is known. Show the important notice if applicable. // This may be overriden by showing suggestions later, if applicable. if (oldw <= 0 && w > 0) { maybeShowImportantNoticeTitle(); } } }