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/*
* Copyright (C) 2012 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.android.inputmethod.keyboard.internal;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Rect;
import android.graphics.RectF;
import android.text.TextUtils;
import com.android.inputmethod.keyboard.PointerTracker;
import com.android.inputmethod.latin.R;
import com.android.inputmethod.latin.SuggestedWords;
import com.android.inputmethod.latin.utils.CoordinateUtils;
/**
* The class for single gesture preview text. The class for multiple gesture preview text will be
* derived from it.
*
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextSize
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextColor
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextOffset
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewColor
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewHorizontalPadding
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewVerticalPadding
* @attr ref R.styleable#KeyboardView_gestureFloatingPreviewRoundRadius
*/
public class GestureFloatingTextDrawingPreview extends AbstractDrawingPreview {
protected static final class GesturePreviewTextParams {
public final int mGesturePreviewTextOffset;
public final int mGesturePreviewTextHeight;
public final float mGesturePreviewHorizontalPadding;
public final float mGesturePreviewVerticalPadding;
public final float mGesturePreviewRoundRadius;
public final int mDisplayWidth;
private final int mGesturePreviewTextSize;
private final int mGesturePreviewTextColor;
private final int mGesturePreviewColor;
private final Paint mPaint = new Paint();
private static final char[] TEXT_HEIGHT_REFERENCE_CHAR = { 'M' };
public GesturePreviewTextParams(final TypedArray mainKeyboardViewAttr) {
mGesturePreviewTextSize = mainKeyboardViewAttr.getDimensionPixelSize(
R.styleable.MainKeyboardView_gestureFloatingPreviewTextSize, 0);
mGesturePreviewTextColor = mainKeyboardViewAttr.getColor(
R.styleable.MainKeyboardView_gestureFloatingPreviewTextColor, 0);
mGesturePreviewTextOffset = mainKeyboardViewAttr.getDimensionPixelOffset(
R.styleable.MainKeyboardView_gestureFloatingPreviewTextOffset, 0);
mGesturePreviewColor = mainKeyboardViewAttr.getColor(
R.styleable.MainKeyboardView_gestureFloatingPreviewColor, 0);
mGesturePreviewHorizontalPadding = mainKeyboardViewAttr.getDimension(
R.styleable.MainKeyboardView_gestureFloatingPreviewHorizontalPadding, 0.0f);
mGesturePreviewVerticalPadding = mainKeyboardViewAttr.getDimension(
R.styleable.MainKeyboardView_gestureFloatingPreviewVerticalPadding, 0.0f);
mGesturePreviewRoundRadius = mainKeyboardViewAttr.getDimension(
R.styleable.MainKeyboardView_gestureFloatingPreviewRoundRadius, 0.0f);
mDisplayWidth = mainKeyboardViewAttr.getResources().getDisplayMetrics().widthPixels;
final Paint textPaint = getTextPaint();
final Rect textRect = new Rect();
textPaint.getTextBounds(TEXT_HEIGHT_REFERENCE_CHAR, 0, 1, textRect);
mGesturePreviewTextHeight = textRect.height();
}
public Paint getTextPaint() {
mPaint.setAntiAlias(true);
mPaint.setTextAlign(Align.CENTER);
mPaint.setTextSize(mGesturePreviewTextSize);
mPaint.setColor(mGesturePreviewTextColor);
return mPaint;
}
public Paint getBackgroundPaint() {
mPaint.setColor(mGesturePreviewColor);
return mPaint;
}
}
private final GesturePreviewTextParams mParams;
private final RectF mGesturePreviewRectangle = new RectF();
private int mPreviewTextX;
private int mPreviewTextY;
private SuggestedWords mSuggestedWords = SuggestedWords.EMPTY;
private final int[] mLastPointerCoords = CoordinateUtils.newInstance();
public GestureFloatingTextDrawingPreview(final TypedArray mainKeyboardViewAttr) {
mParams = new GesturePreviewTextParams(mainKeyboardViewAttr);
}
@Override
public void onDeallocateMemory() {
// Nothing to do here.
}
public void setSuggetedWords(final SuggestedWords suggestedWords) {
if (!isPreviewEnabled()) {
return;
}
mSuggestedWords = suggestedWords;
updatePreviewPosition();
}
@Override
public void setPreviewPosition(final PointerTracker tracker) {
if (!isPreviewEnabled()) {
return;
}
tracker.getLastCoordinates(mLastPointerCoords);
updatePreviewPosition();
}
/**
* Draws gesture preview text
* @param canvas The canvas where preview text is drawn.
*/
@Override
public void drawPreview(final Canvas canvas) {
if (!isPreviewEnabled() || mSuggestedWords.isEmpty()
|| TextUtils.isEmpty(mSuggestedWords.getWord(0))) {
return;
}
final float round = mParams.mGesturePreviewRoundRadius;
canvas.drawRoundRect(
mGesturePreviewRectangle, round, round, mParams.getBackgroundPaint());
final String text = mSuggestedWords.getWord(0);
canvas.drawText(text, mPreviewTextX, mPreviewTextY, mParams.getTextPaint());
}
/**
* Updates gesture preview text position based on mLastPointerCoords.
*/
protected void updatePreviewPosition() {
if (mSuggestedWords.isEmpty() || TextUtils.isEmpty(mSuggestedWords.getWord(0))) {
invalidateDrawingView();
return;
}
final String text = mSuggestedWords.getWord(0);
final RectF rectangle = mGesturePreviewRectangle;
final int textHeight = mParams.mGesturePreviewTextHeight;
final float textWidth = mParams.getTextPaint().measureText(text);
final float hPad = mParams.mGesturePreviewHorizontalPadding;
final float vPad = mParams.mGesturePreviewVerticalPadding;
final float rectWidth = textWidth + hPad * 2.0f;
final float rectHeight = textHeight + vPad * 2.0f;
final float rectX = Math.min(
Math.max(CoordinateUtils.x(mLastPointerCoords) - rectWidth / 2.0f, 0.0f),
mParams.mDisplayWidth - rectWidth);
final float rectY = CoordinateUtils.y(mLastPointerCoords)
- mParams.mGesturePreviewTextOffset - rectHeight;
rectangle.set(rectX, rectY, rectX + rectWidth, rectY + rectHeight);
mPreviewTextX = (int)(rectX + hPad + textWidth / 2.0f);
mPreviewTextY = (int)(rectY + vPad) + textHeight;
// TODO: Should narrow the invalidate region.
invalidateDrawingView();
}
}
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