auto import from //depot/cupcake/@135843
This commit is contained in:
The Android Open Source Project
321
samples/SoftKeyboard/src/com/example/android/softkeyboard/CandidateView.java
Executable file
321
samples/SoftKeyboard/src/com/example/android/softkeyboard/CandidateView.java
Executable file
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/*
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* Copyright (C) 2008-2009 Google Inc.
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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.example.android.softkeyboard;
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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.drawable.Drawable;
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import android.view.GestureDetector;
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import android.view.MotionEvent;
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import android.view.View;
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import java.util.ArrayList;
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import java.util.List;
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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 SoftKeyboard mService;
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private List<String> mSuggestions;
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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 Rect mBgPadding;
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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 int[] mWordWidth = new int[MAX_SUGGESTIONS];
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private int[] mWordX = new int[MAX_SUGGESTIONS];
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private static final int X_GAP = 10;
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private static final List<String> EMPTY_LIST = new ArrayList<String>();
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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 int mVerticalPadding;
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private Paint mPaint;
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private boolean mScrolled;
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private int mTargetScrollX;
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private int mTotalWidth;
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private GestureDetector mGestureDetector;
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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) {
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super(context);
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mSelectionHighlight = context.getResources().getDrawable(
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android.R.drawable.list_selector_background);
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mSelectionHighlight.setState(new int[] {
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android.R.attr.state_enabled,
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android.R.attr.state_focused,
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android.R.attr.state_window_focused,
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android.R.attr.state_pressed
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});
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Resources r = context.getResources();
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setBackgroundColor(r.getColor(R.color.candidate_background));
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mColorNormal = r.getColor(R.color.candidate_normal);
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mColorRecommended = r.getColor(R.color.candidate_recommended);
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mColorOther = r.getColor(R.color.candidate_other);
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mVerticalPadding = r.getDimensionPixelSize(R.dimen.candidate_vertical_padding);
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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(r.getDimensionPixelSize(R.dimen.candidate_font_height));
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mPaint.setStrokeWidth(0);
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mGestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
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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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mScrolled = true;
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int sx = getScrollX();
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sx += distanceX;
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if (sx < 0) {
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sx = 0;
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}
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if (sx + getWidth() > mTotalWidth) {
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sx -= distanceX;
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}
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mTargetScrollX = sx;
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scrollTo(sx, getScrollY());
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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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}
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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(SoftKeyboard 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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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int measuredWidth = resolveSize(50, widthMeasureSpec);
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// Get the desired height of the icon menu view (last row of items does
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// not have a divider below)
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Rect padding = new Rect();
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mSelectionHighlight.getPadding(padding);
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final int desiredHeight = ((int)mPaint.getTextSize()) + mVerticalPadding
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+ padding.top + padding.bottom;
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// Maximum possible width and desired height
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setMeasuredDimension(measuredWidth,
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resolveSize(desiredHeight, heightMeasureSpec));
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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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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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}
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int x = 0;
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final int count = mSuggestions.size();
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final int height = getHeight();
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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()) / 2) - mPaint.ascent());
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for (int i = 0; i < count; i++) {
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String suggestion = mSuggestions.get(i);
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float textWidth = paint.measureText(suggestion);
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final int wordWidth = (int) textWidth + X_GAP * 2;
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mWordX[i] = x;
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mWordWidth[i] = wordWidth;
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paint.setColor(mColorNormal);
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if (touchX + scrollX >= x && touchX + scrollX < x + wordWidth && !scrolled) {
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if (canvas != null) {
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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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}
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mSelectedIndex = i;
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}
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if (canvas != null) {
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if ((i == 1 && !typedWordValid) || (i == 0 && typedWordValid)) {
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paint.setFakeBoldText(true);
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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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canvas.drawText(suggestion, x + X_GAP, y, paint);
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paint.setColor(mColorOther);
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canvas.drawLine(x + wordWidth + 0.5f, bgPadding.top,
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x + wordWidth + 0.5f, height + 1, paint);
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paint.setFakeBoldText(false);
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}
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x += wordWidth;
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}
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mTotalWidth = x;
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if (mTargetScrollX != getScrollX()) {
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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 sx = getScrollX();
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if (mTargetScrollX > sx) {
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sx += SCROLL_PIXELS;
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if (sx >= mTargetScrollX) {
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sx = mTargetScrollX;
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requestLayout();
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}
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} else {
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sx -= SCROLL_PIXELS;
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if (sx <= mTargetScrollX) {
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sx = mTargetScrollX;
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requestLayout();
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}
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}
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scrollTo(sx, getScrollY());
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invalidate();
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}
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public void setSuggestions(List<String> suggestions, boolean completions,
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boolean typedWordValid) {
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clear();
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if (suggestions != null) {
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mSuggestions = new ArrayList<String>(suggestions);
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}
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mTypedWordValid = typedWordValid;
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scrollTo(0, 0);
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mTargetScrollX = 0;
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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 clear() {
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mSuggestions = EMPTY_LIST;
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mTouchX = OUT_OF_BOUNDS;
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mSelectedIndex = -1;
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invalidate();
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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 (mSelectedIndex >= 0) {
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mService.pickSuggestionManually(mSelectedIndex);
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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 (mSelectedIndex >= 0) {
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mService.pickSuggestionManually(mSelectedIndex);
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}
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}
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mSelectedIndex = -1;
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removeHighlight();
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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 (mSelectedIndex >= 0) {
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mService.pickSuggestionManually(mSelectedIndex);
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}
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invalidate();
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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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}
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