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The source code is released under:
GNU General Public License
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/* * Copyright (C) 2008-2009 Google Inc./*from w w w .j a va 2 s. c o m*/ * * 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.spartacusrex.spartacuside.keyboard; import android.content.Context; import android.content.res.Resources; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import org.dyne.zshaolin.R; import java.util.ArrayList; import java.util.List; public class CandidateView extends View { private static final int OUT_OF_BOUNDS = -1; private TerminalKeyboard mService; private List<String> mSuggestions; private int mSelectedIndex; private int mTouchX = OUT_OF_BOUNDS; private Drawable mSelectionHighlight; private boolean mTypedWordValid; private Rect mBgPadding; private static final int MAX_SUGGESTIONS = 32; private static final int SCROLL_PIXELS = 20; 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<String> EMPTY_LIST = new ArrayList<String>(); 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 GestureDetector mGestureDetector; /** * Construct a CandidateView for showing suggested words for completion. * @param context * @param attrs */ 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); mGestureDetector = new GestureDetector(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); } /** * A connection back to the service to communicate with the text field * @param listener */ public void setService(TerminalKeyboard listener) { mService = 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 + padding.top + padding.bottom; // Maximum possible width and desired height setMeasuredDimension(measuredWidth, resolveSize(desiredHeight, heightMeasureSpec)); } /** * 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 boolean typedWordValid = mTypedWordValid; final int y = (int) (((height - mPaint.getTextSize()) / 2) - mPaint.ascent()); for (int i = 0; i < count; i++) { String suggestion = mSuggestions.get(i); float textWidth = paint.measureText(suggestion); final int wordWidth = (int) textWidth + X_GAP * 2; mWordX[i] = x; mWordWidth[i] = wordWidth; 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) { if ((i == 1 && !typedWordValid) || (i == 0 && typedWordValid)) { paint.setFakeBoldText(true); paint.setColor(mColorRecommended); } else if (i != 0) { paint.setColor(mColorOther); } canvas.drawText(suggestion, x + X_GAP, y, paint); paint.setColor(mColorOther); canvas.drawLine(x + wordWidth + 0.5f, bgPadding.top, x + wordWidth + 0.5f, height + 1, paint); paint.setFakeBoldText(false); } x += wordWidth; } 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 setSuggestions(List<String> suggestions, boolean completions, boolean typedWordValid) { clear(); if (suggestions != null) { mSuggestions = new ArrayList<String>(suggestions); } mTypedWordValid = typedWordValid; 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; 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) { mService.pickSuggestionManually(mSelectedIndex); mSelectedIndex = -1; } } invalidate(); break; case MotionEvent.ACTION_UP: if (!mScrolled) { if (mSelectedIndex >= 0) { mService.pickSuggestionManually(mSelectedIndex); } } mSelectedIndex = -1; removeHighlight(); requestLayout(); 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 onDraw(null); if (mSelectedIndex >= 0) { mService.pickSuggestionManually(mSelectedIndex); } invalidate(); } private void removeHighlight() { mTouchX = OUT_OF_BOUNDS; invalidate(); } }