534 lines
19 KiB
Java
Executable File
534 lines
19 KiB
Java
Executable File
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.Typeface;
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import android.graphics.Paint.Align;
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import android.graphics.drawable.Drawable;
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import android.os.Handler;
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import android.os.Message;
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import android.util.AttributeSet;
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import android.view.GestureDetector;
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import android.view.Gravity;
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import android.view.LayoutInflater;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewGroup.LayoutParams;
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import android.widget.PopupWindow;
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import android.widget.TextView;
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public class CandidateView extends View {
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private static final int OUT_OF_BOUNDS = -1;
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private static final List<CharSequence> EMPTY_LIST = new ArrayList<CharSequence>();
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private LatinIME mService;
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private List<CharSequence> mSuggestions = EMPTY_LIST;
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private boolean mShowingCompletions;
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private CharSequence mSelectedString;
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private int mSelectedIndex;
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private int mTouchX = OUT_OF_BOUNDS;
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private Drawable mSelectionHighlight;
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private boolean mTypedWordValid;
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private boolean mHaveMinimalSuggestion;
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private Rect mBgPadding;
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private TextView mPreviewText;
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private PopupWindow mPreviewPopup;
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private int mCurrentWordIndex;
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private Drawable mDivider;
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private static final int MAX_SUGGESTIONS = 32;
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private static final int SCROLL_PIXELS = 20;
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private static final int MSG_REMOVE_PREVIEW = 1;
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private static final int MSG_REMOVE_THROUGH_PREVIEW = 2;
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private int[] mWordWidth = new int[MAX_SUGGESTIONS];
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private int[] mWordX = new int[MAX_SUGGESTIONS];
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private int mPopupPreviewX;
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private int mPopupPreviewY;
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private static final int X_GAP = 10;
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private int mColorNormal;
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private int mColorRecommended;
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private int mColorOther;
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private Paint mPaint;
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private int mDescent;
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private boolean mScrolled;
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private boolean mShowingAddToDictionary;
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private CharSequence mWordToAddToDictionary;
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private CharSequence mAddToDictionaryHint;
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private int mTargetScrollX;
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private int mMinTouchableWidth;
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private int mTotalWidth;
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private GestureDetector mGestureDetector;
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Handler mHandler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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switch (msg.what) {
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case MSG_REMOVE_PREVIEW:
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mPreviewText.setVisibility(GONE);
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break;
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case MSG_REMOVE_THROUGH_PREVIEW:
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mPreviewText.setVisibility(GONE);
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if (mTouchX != OUT_OF_BOUNDS) {
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removeHighlight();
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}
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break;
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}
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}
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};
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/**
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* Construct a CandidateView for showing suggested words for completion.
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* @param context
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* @param attrs
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*/
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public CandidateView(Context context, AttributeSet attrs) {
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super(context, attrs);
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mSelectionHighlight = context.getResources().getDrawable(
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R.drawable.list_selector_background_pressed);
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LayoutInflater inflate =
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(LayoutInflater) context
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.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
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Resources res = context.getResources();
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mPreviewPopup = new PopupWindow(context);
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mPreviewText = (TextView) inflate.inflate(R.layout.candidate_preview, null);
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mPreviewPopup.setWindowLayoutMode(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
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mPreviewPopup.setContentView(mPreviewText);
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mPreviewPopup.setBackgroundDrawable(null);
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mColorNormal = res.getColor(R.color.candidate_normal);
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mColorRecommended = res.getColor(R.color.candidate_recommended);
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mColorOther = res.getColor(R.color.candidate_other);
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mDivider = res.getDrawable(R.drawable.keyboard_suggest_strip_divider);
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mAddToDictionaryHint = res.getString(R.string.hint_add_to_dictionary);
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mPaint = new Paint();
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mPaint.setColor(mColorNormal);
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mPaint.setAntiAlias(true);
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mPaint.setTextSize(mPreviewText.getTextSize());
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mPaint.setStrokeWidth(0);
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mPaint.setTextAlign(Align.CENTER);
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mDescent = (int) mPaint.descent();
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// 80 pixels for a 160dpi device would mean half an inch
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mMinTouchableWidth = (int) (getResources().getDisplayMetrics().density * 50);
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mGestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
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@Override
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public void onLongPress(MotionEvent me) {
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if (mSuggestions.size() > 0) {
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if (me.getX() + getScrollX() < mWordWidth[0] && getScrollX() < 10) {
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longPressFirstWord();
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}
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}
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}
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@Override
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public boolean onScroll(MotionEvent e1, MotionEvent e2,
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float distanceX, float distanceY) {
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final int width = getWidth();
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mScrolled = true;
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int scrollX = getScrollX();
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scrollX += (int) distanceX;
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if (scrollX < 0) {
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scrollX = 0;
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}
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if (distanceX > 0 && scrollX + width > mTotalWidth) {
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scrollX -= (int) distanceX;
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}
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mTargetScrollX = scrollX;
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scrollTo(scrollX, getScrollY());
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hidePreview();
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invalidate();
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return true;
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}
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});
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setHorizontalFadingEdgeEnabled(true);
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setWillNotDraw(false);
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setHorizontalScrollBarEnabled(false);
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setVerticalScrollBarEnabled(false);
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scrollTo(0, getScrollY());
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}
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/**
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* A connection back to the service to communicate with the text field
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* @param listener
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*/
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public void setService(LatinIME listener) {
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mService = listener;
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}
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@Override
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public int computeHorizontalScrollRange() {
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return mTotalWidth;
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}
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/**
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* If the canvas is null, then only touch calculations are performed to pick the target
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* candidate.
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*/
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@Override
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protected void onDraw(Canvas canvas) {
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if (canvas != null) {
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super.onDraw(canvas);
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}
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mTotalWidth = 0;
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if (mSuggestions == null) return;
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final int height = getHeight();
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if (mBgPadding == null) {
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mBgPadding = new Rect(0, 0, 0, 0);
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if (getBackground() != null) {
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getBackground().getPadding(mBgPadding);
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}
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mDivider.setBounds(0, 0, mDivider.getIntrinsicWidth(),
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mDivider.getIntrinsicHeight());
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}
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int x = 0;
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final int count = mSuggestions.size();
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final int width = getWidth();
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final Rect bgPadding = mBgPadding;
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final Paint paint = mPaint;
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final int touchX = mTouchX;
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final int scrollX = getScrollX();
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final boolean scrolled = mScrolled;
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final boolean typedWordValid = mTypedWordValid;
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final int y = (int) (height + mPaint.getTextSize() - mDescent) / 2;
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for (int i = 0; i < count; i++) {
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CharSequence suggestion = mSuggestions.get(i);
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if (suggestion == null) continue;
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paint.setColor(mColorNormal);
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if (mHaveMinimalSuggestion
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&& ((i == 1 && !typedWordValid) || (i == 0 && typedWordValid))) {
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paint.setTypeface(Typeface.DEFAULT_BOLD);
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paint.setColor(mColorRecommended);
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} else if (i != 0) {
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paint.setColor(mColorOther);
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}
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final int wordWidth;
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if (mWordWidth[i] != 0) {
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wordWidth = mWordWidth[i];
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} else {
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float textWidth = paint.measureText(suggestion, 0, suggestion.length());
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wordWidth = Math.max(mMinTouchableWidth, (int) textWidth + X_GAP * 2);
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mWordWidth[i] = wordWidth;
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}
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mWordX[i] = x;
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if (touchX + scrollX >= x && touchX + scrollX < x + wordWidth && !scrolled &&
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touchX != OUT_OF_BOUNDS) {
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if (canvas != null && !mShowingAddToDictionary) {
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canvas.translate(x, 0);
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mSelectionHighlight.setBounds(0, bgPadding.top, wordWidth, height);
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mSelectionHighlight.draw(canvas);
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canvas.translate(-x, 0);
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showPreview(i, null);
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}
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mSelectedString = suggestion;
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mSelectedIndex = i;
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}
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if (canvas != null) {
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canvas.drawText(suggestion, 0, suggestion.length(), x + wordWidth / 2, y, paint);
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paint.setColor(mColorOther);
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canvas.translate(x + wordWidth, 0);
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// Draw a divider unless it's after the hint
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if (!(mShowingAddToDictionary && i == 1)) {
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mDivider.draw(canvas);
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}
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canvas.translate(-x - wordWidth, 0);
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}
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paint.setTypeface(Typeface.DEFAULT);
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x += wordWidth;
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}
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mTotalWidth = x;
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if (mTargetScrollX != scrollX) {
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scrollToTarget();
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}
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}
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private void scrollToTarget() {
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int scrollX = getScrollX();
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if (mTargetScrollX > scrollX) {
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scrollX += SCROLL_PIXELS;
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if (scrollX >= mTargetScrollX) {
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scrollX = mTargetScrollX;
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scrollTo(scrollX, getScrollY());
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requestLayout();
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} else {
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scrollTo(scrollX, getScrollY());
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}
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} else {
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scrollX -= SCROLL_PIXELS;
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if (scrollX <= mTargetScrollX) {
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scrollX = mTargetScrollX;
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scrollTo(scrollX, getScrollY());
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requestLayout();
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} else {
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scrollTo(scrollX, getScrollY());
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}
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}
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invalidate();
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}
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public void setSuggestions(List<CharSequence> suggestions, boolean completions,
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boolean typedWordValid, boolean haveMinimalSuggestion) {
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clear();
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if (suggestions != null) {
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mSuggestions = new ArrayList<CharSequence>(suggestions);
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}
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mShowingCompletions = completions;
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mTypedWordValid = typedWordValid;
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scrollTo(0, getScrollY());
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mTargetScrollX = 0;
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mHaveMinimalSuggestion = haveMinimalSuggestion;
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// Compute the total width
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onDraw(null);
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invalidate();
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requestLayout();
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}
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public void showAddToDictionaryHint(CharSequence word) {
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mWordToAddToDictionary = word;
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ArrayList<CharSequence> suggestions = new ArrayList<CharSequence>();
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suggestions.add(word);
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suggestions.add(mAddToDictionaryHint);
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setSuggestions(suggestions, false, false, false);
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mShowingAddToDictionary = true;
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}
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public void scrollPrev() {
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int i = 0;
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final int count = mSuggestions.size();
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int firstItem = 0; // Actually just before the first item, if at the boundary
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while (i < count) {
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if (mWordX[i] < getScrollX()
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&& mWordX[i] + mWordWidth[i] >= getScrollX() - 1) {
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firstItem = i;
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break;
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}
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i++;
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}
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int leftEdge = mWordX[firstItem] + mWordWidth[firstItem] - getWidth();
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if (leftEdge < 0) leftEdge = 0;
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updateScrollPosition(leftEdge);
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}
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public void scrollNext() {
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int i = 0;
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int scrollX = getScrollX();
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int targetX = scrollX;
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final int count = mSuggestions.size();
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int rightEdge = scrollX + getWidth();
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while (i < count) {
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if (mWordX[i] <= rightEdge &&
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mWordX[i] + mWordWidth[i] >= rightEdge) {
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targetX = Math.min(mWordX[i], mTotalWidth - getWidth());
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break;
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}
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i++;
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}
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updateScrollPosition(targetX);
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}
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private void updateScrollPosition(int targetX) {
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if (targetX != getScrollX()) {
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// TODO: Animate
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mTargetScrollX = targetX;
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requestLayout();
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invalidate();
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mScrolled = true;
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}
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}
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public void clear() {
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mSuggestions = EMPTY_LIST;
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mTouchX = OUT_OF_BOUNDS;
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mSelectedString = null;
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mSelectedIndex = -1;
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mShowingAddToDictionary = false;
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invalidate();
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Arrays.fill(mWordWidth, 0);
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Arrays.fill(mWordX, 0);
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if (mPreviewPopup.isShowing()) {
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mPreviewPopup.dismiss();
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}
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}
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@Override
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public boolean onTouchEvent(MotionEvent me) {
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if (mGestureDetector.onTouchEvent(me)) {
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return true;
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}
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int action = me.getAction();
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int x = (int) me.getX();
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int y = (int) me.getY();
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mTouchX = x;
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mScrolled = false;
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invalidate();
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break;
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case MotionEvent.ACTION_MOVE:
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if (y <= 0) {
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// Fling up!?
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if (mSelectedString != null) {
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if (!mShowingCompletions) {
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TextEntryState.acceptedSuggestion(mSuggestions.get(0),
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mSelectedString);
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}
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mService.pickSuggestionManually(mSelectedIndex, mSelectedString);
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mSelectedString = null;
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mSelectedIndex = -1;
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}
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}
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invalidate();
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break;
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case MotionEvent.ACTION_UP:
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if (!mScrolled) {
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if (mSelectedString != null) {
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if (mShowingAddToDictionary) {
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longPressFirstWord();
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clear();
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} else {
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if (!mShowingCompletions) {
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TextEntryState.acceptedSuggestion(mSuggestions.get(0),
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mSelectedString);
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}
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mService.pickSuggestionManually(mSelectedIndex, mSelectedString);
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}
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}
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}
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mSelectedString = null;
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mSelectedIndex = -1;
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removeHighlight();
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hidePreview();
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requestLayout();
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break;
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}
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return true;
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}
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/**
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* For flick through from keyboard, call this method with the x coordinate of the flick
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* gesture.
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* @param x
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*/
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public void takeSuggestionAt(float x) {
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mTouchX = (int) x;
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// To detect candidate
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onDraw(null);
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if (mSelectedString != null) {
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if (!mShowingCompletions) {
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TextEntryState.acceptedSuggestion(mSuggestions.get(0), mSelectedString);
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}
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mService.pickSuggestionManually(mSelectedIndex, mSelectedString);
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}
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invalidate();
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mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_REMOVE_THROUGH_PREVIEW), 200);
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}
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private void hidePreview() {
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mCurrentWordIndex = OUT_OF_BOUNDS;
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if (mPreviewPopup.isShowing()) {
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mHandler.sendMessageDelayed(mHandler
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.obtainMessage(MSG_REMOVE_PREVIEW), 60);
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}
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}
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private void showPreview(int wordIndex, String altText) {
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int oldWordIndex = mCurrentWordIndex;
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mCurrentWordIndex = wordIndex;
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// If index changed or changing text
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if (oldWordIndex != mCurrentWordIndex || altText != null) {
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if (wordIndex == OUT_OF_BOUNDS) {
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hidePreview();
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} else {
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CharSequence word = altText != null? altText : mSuggestions.get(wordIndex);
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mPreviewText.setText(word);
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mPreviewText.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
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MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
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int wordWidth = (int) (mPaint.measureText(word, 0, word.length()) + X_GAP * 2);
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final int popupWidth = wordWidth
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+ mPreviewText.getPaddingLeft() + mPreviewText.getPaddingRight();
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final int popupHeight = mPreviewText.getMeasuredHeight();
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//mPreviewText.setVisibility(INVISIBLE);
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mPopupPreviewX = mWordX[wordIndex] - mPreviewText.getPaddingLeft() - getScrollX()
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+ (mWordWidth[wordIndex] - wordWidth) / 2;
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mPopupPreviewY = - popupHeight;
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mHandler.removeMessages(MSG_REMOVE_PREVIEW);
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int [] offsetInWindow = new int[2];
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getLocationInWindow(offsetInWindow);
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if (mPreviewPopup.isShowing()) {
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mPreviewPopup.update(mPopupPreviewX, mPopupPreviewY + offsetInWindow[1],
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popupWidth, popupHeight);
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} else {
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mPreviewPopup.setWidth(popupWidth);
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mPreviewPopup.setHeight(popupHeight);
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mPreviewPopup.showAtLocation(this, Gravity.NO_GRAVITY, mPopupPreviewX,
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mPopupPreviewY + offsetInWindow[1]);
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}
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mPreviewText.setVisibility(VISIBLE);
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}
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}
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}
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private void removeHighlight() {
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mTouchX = OUT_OF_BOUNDS;
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invalidate();
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}
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private void longPressFirstWord() {
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CharSequence word = mSuggestions.get(0);
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if (word.length() < 2) return;
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if (mService.addWordToDictionary(word.toString())) {
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showPreview(0, getContext().getResources().getString(R.string.added_word, word));
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}
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}
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@Override
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public void onDetachedFromWindow() {
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super.onDetachedFromWindow();
|
|
hidePreview();
|
|
}
|
|
}
|