Java tutorial
/* * Copyright (C) 2008-2009 Google Inc. * * 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 fr.magistry.taigime; import android.content.Context; import android.content.res.Resources; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Typeface; import android.graphics.drawable.Drawable; import android.support.v4.view.GestureDetectorCompat; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import java.util.ArrayList; import java.util.List; public class CandidateView extends View { private static final int OUT_OF_BOUNDS = -1; private int ROMANISATION_INPUT_MODE = 0; private int ROMANISATION_OUTPUT_MODE = 0; private Composer mComposer; private List<Candidate> mSuggestions; private String mUnusedSuffix = ""; private int mSelectedIndex; private int mTouchX = OUT_OF_BOUNDS; private Drawable mSelectionHighlight; private int mCursor = 0; private Rect mBgPadding; private static final int MAX_SUGGESTIONS = 1320; private static final int SCROLL_PIXELS = 30; private int[] mWordWidth = new int[MAX_SUGGESTIONS]; private int[] mWordX = new int[MAX_SUGGESTIONS]; private static final int X_GAP = 10; private static final List<Candidate> EMPTY_LIST = new ArrayList<Candidate>(); private int mColorNormal; private int mColorRecommended; private int mColorOther; private int mVerticalPadding; private Paint mPaint; private boolean mScrolled; private int mTargetScrollX; private int mTotalWidth; private GestureDetectorCompat mGestureDetector; private Paint mPaintTRS; private Paint mPaintBPM; private boolean mOutputTRS = true; /** * Construct a CandidateView for showing suggested words for completion. * @param context */ public CandidateView(Context context) { super(context); mSelectionHighlight = context.getResources().getDrawable(android.R.drawable.list_selector_background); mSelectionHighlight.setState(new int[] { android.R.attr.state_enabled, android.R.attr.state_focused, android.R.attr.state_window_focused, android.R.attr.state_pressed }); Resources r = context.getResources(); setBackgroundColor(r.getColor(R.color.candidate_background)); mColorNormal = r.getColor(R.color.candidate_normal); mColorRecommended = r.getColor(R.color.candidate_recommended); mColorOther = r.getColor(R.color.candidate_other); mVerticalPadding = r.getDimensionPixelSize(R.dimen.candidate_vertical_padding); mPaint = new Paint(); mPaint.setColor(mColorNormal); mPaint.setAntiAlias(true); mPaint.setTextSize(r.getDimensionPixelSize(R.dimen.candidate_font_height)); mPaint.setStrokeWidth(0); mPaintTRS = new Paint(); mPaintTRS.set(mPaint); mPaintTRS.setTextSize(r.getDimensionPixelSize(R.dimen.candidate_font_trs_height)); mPaintBPM = new Paint(); mPaintBPM.set(mPaintTRS); mGestureDetector = new GestureDetectorCompat(context, new GestureDetector.SimpleOnGestureListener() { @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { mScrolled = true; int sx = getScrollX(); sx += distanceX; if (sx < 0) { sx = 0; } if (sx + getWidth() > mTotalWidth) { sx -= distanceX; } mTargetScrollX = sx; scrollTo(sx, getScrollY()); invalidate(); return true; } }); setHorizontalFadingEdgeEnabled(true); setWillNotDraw(false); setHorizontalScrollBarEnabled(false); setVerticalScrollBarEnabled(false); updateConfig(context); } /** * A connection back to the service to communicate with the text field * @param listener */ public void setService(TaigIMEService listener) { } @Override public int computeHorizontalScrollRange() { return mTotalWidth; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int measuredWidth = resolveSize(50, widthMeasureSpec); // Get the desired height of the icon menu view (last row of items does // not have a divider below) Rect padding = new Rect(); mSelectionHighlight.getPadding(padding); final int desiredHeight = ((int) mPaint.getTextSize()) + mVerticalPadding * 3 + padding.top + padding.bottom + ((int) mPaintTRS.getTextSize()); // Maximum possible width and desired height setMeasuredDimension(measuredWidth, resolveSize(desiredHeight, heightMeasureSpec)); } private float reduceTextSizeFromWidth(Paint p, String str, float maxWidth) { float size = p.getTextSize(); if (str.length() == 0) return size; while (p.measureText(str) > maxWidth) { p.setTextSize(--size); } return size; } /** * If the canvas is null, then only touch calculations are performed to pick the target * candidate. */ @Override protected void onDraw(Canvas canvas) { if (canvas != null) { super.onDraw(canvas); } mTotalWidth = 0; if (mSuggestions == null) return; if (mBgPadding == null) { mBgPadding = new Rect(0, 0, 0, 0); if (getBackground() != null) { getBackground().getPadding(mBgPadding); } } int x = 0; final int count = mSuggestions.size(); final int height = getHeight(); final Rect bgPadding = mBgPadding; final Paint paint = mPaint; final int touchX = mTouchX; final int scrollX = getScrollX(); final boolean scrolled = mScrolled; final int y; //= (int) ( - mPaint.ascent() + mVerticalPadding); final int y2; //= (int) (height - mPaintTRS.descent()); // (y - mVerticalPadding - mPaint.descent() - mPaintTRS.ascent()) ; final float initialTRSsize = mPaintTRS.getTextSize(); if (mOutputTRS) { y2 = (int) (-mPaintTRS.ascent() + mVerticalPadding); y = (int) (height - mPaint.descent()); } else { y = (int) (-mPaint.ascent() + mVerticalPadding); y2 = (int) (height - mPaintTRS.descent()); } for (int i = 0; i < count; i++) { Candidate suggestion = mSuggestions.get(i); String hanji = suggestion.getWord().getHanji(); String trs = ""; switch (ROMANISATION_OUTPUT_MODE) { case 0: trs = suggestion.getWord().getTailuo(); break; case 1: trs = suggestion.getWord().getPOJ(); break; case 2: trs = suggestion.getWord().getPOJ_safe(); break; default: trs = suggestion.getWord().getTailuo(); } float textWidth; if (i == 0) { hanji = ""; trs = "";//hanji;//TODO: conversion? //if(mOutputTRS){ trs = suggestion.getWord().getBopomo(); if (trs != "") textWidth = mPaintBPM.measureText(trs); else textWidth = 3; //} //else { // hanji = suggestion.getWord().getBopomo(); // textWidth = paint.measureText(hanji); //} } else textWidth = paint.measureText(hanji); if (textWidth == 0.0) textWidth = paint.measureText(" "); final int wordWidth = (int) textWidth + X_GAP * 2; mWordX[i] = x; mWordWidth[i] = wordWidth; mPaintTRS.setTextSize(initialTRSsize); mPaintTRS.setTextSize(reduceTextSizeFromWidth(mPaintTRS, trs, textWidth)); paint.setColor(mColorNormal); if (touchX + scrollX >= x && touchX + scrollX < x + wordWidth && !scrolled) { if (canvas != null) { canvas.translate(x, 0); mSelectionHighlight.setBounds(0, bgPadding.top, wordWidth, height); mSelectionHighlight.draw(canvas); canvas.translate(-x, 0); } mSelectedIndex = i; } if (canvas != null) { Paint activePaint = null; Paint secondPaint = null; if (mOutputTRS) { activePaint = mPaintTRS; secondPaint = paint; } else { activePaint = paint; secondPaint = mPaintTRS; } if (i == 0) { activePaint = mPaintBPM; } secondPaint.setAlpha(150); if ((i == mCursor)) { activePaint.setFakeBoldText(true); activePaint.setColor(mColorRecommended); } else if (i != 0) { activePaint.setColor(mColorOther); } if (i == 0) { canvas.drawText(trs, x + X_GAP, y2, mPaintBPM); } else { canvas.drawText(hanji, x + X_GAP, y, paint); canvas.drawText(trs, x + X_GAP, y2, mPaintTRS); } activePaint.setColor(mColorOther); canvas.drawLine(x + wordWidth + 0.5f, bgPadding.top, x + wordWidth + 0.5f, height + 1, paint); activePaint.setFakeBoldText(false); secondPaint.setAlpha(255); } x += wordWidth; mPaintTRS.setTextSize(initialTRSsize); } mTotalWidth = x; if (mTargetScrollX != getScrollX()) { scrollToTarget(); } } private void scrollToTarget() { int sx = getScrollX(); if (mTargetScrollX > sx) { sx += SCROLL_PIXELS; if (sx >= mTargetScrollX) { sx = mTargetScrollX; requestLayout(); } } else { sx -= SCROLL_PIXELS; if (sx <= mTargetScrollX) { sx = mTargetScrollX; requestLayout(); } } scrollTo(sx, getScrollY()); invalidate(); } public void updateConfig(Context context) { ROMANISATION_INPUT_MODE = context.getSharedPreferences("TAIGI_IME", 0).getInt("input_mode", 0); ROMANISATION_OUTPUT_MODE = context.getSharedPreferences("TAIGI_IME", 0).getInt("output_mode", 0); } //@SuppressLint("WrongCall") public void setSuggestions(ArrayList<Candidate> suggestions, boolean completions, boolean typedWordValid) { clear(); if (suggestions != null && suggestions.size() > 0) { mSuggestions = suggestions; } scrollTo(0, 0); mTargetScrollX = 0; // Compute the total width //onDraw(null); invalidate(); requestLayout(); } public void clear() { mSuggestions = EMPTY_LIST; mTouchX = OUT_OF_BOUNDS; mSelectedIndex = -1; mCursor = 1; setUnusedSuffix(""); invalidate(); } @Override public boolean onTouchEvent(MotionEvent me) { if (mGestureDetector.onTouchEvent(me)) { return true; } int action = me.getAction(); int x = (int) me.getX(); int y = (int) me.getY(); mTouchX = x; switch (action) { case MotionEvent.ACTION_DOWN: mScrolled = false; invalidate(); break; case MotionEvent.ACTION_MOVE: if (y <= 0) { // Fling up!? if (mSelectedIndex >= 0) { mComposer.pickSuggestion(mSelectedIndex); mSelectedIndex = -1; } } invalidate(); break; case MotionEvent.ACTION_UP: if (!mScrolled) { if (mSelectedIndex >= 0) { mComposer.pickSuggestion(mSelectedIndex); } } mSelectedIndex = -1; removeHighlight(); requestLayout(); //invalidate(); break; } return true; } /** * For flick through from keyboard, call this method with the x coordinate of the flick * gesture. * @param x */ public void takeSuggestionAt(float x) { mTouchX = (int) x; // To detect candidate //draw(null); if (mSelectedIndex >= 0) { mComposer.pickSuggestion(mSelectedIndex); } invalidate(); } public void setSelectedIndex(int idx) { mCursor = idx; } public int getSelectedIndex() { if (mCursor < mSuggestions.size()) return mCursor; if (mSuggestions.size() > 0) return 0; return -1; } public boolean nextSelectedIndex() { if (mCursor < mSuggestions.size()) { mCursor += 1; return true; } return false; } public boolean prevSelectedIndex() { if (mCursor > 0) { mCursor -= 1; return true; } return false; } private void removeHighlight() { mTouchX = OUT_OF_BOUNDS; invalidate(); } public String getUnusedSuffix() { return mUnusedSuffix; } public void setUnusedSuffix(String mUnusedSuffix) { this.mUnusedSuffix = mUnusedSuffix; } public void setTypeface(Typeface tf_hj, Typeface tf_ltn) { mPaint.setTypeface(tf_hj); mPaintBPM.setTypeface(tf_ltn); mPaintTRS.setTypeface(tf_ltn); } public void setComposer(Composer composer) { mComposer = composer; } public boolean isOutputTRS() { return mOutputTRS; } public void setOutputTRS(boolean mOutputTRS) { this.mOutputTRS = mOutputTRS; } }