OutlineTextView.java
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/*
* Copyright (C) 2011 Cedric Fung (wolfplanet@gmail.com)
*
* 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 io.vov.vitamio.widget;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.widget.TextView;
/**
* Display text with border, use the same XML attrs as
* {@link android.widget.TextView}, except that {@link OutlineTextView} will
* transform the shadow to border
*/
@SuppressLint("DrawAllocation")
public class OutlineTextView extends TextView {
public OutlineTextView(Context context) {
super(context);
initPaint();
}
public OutlineTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initPaint();
}
public OutlineTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initPaint();
}
private void initPaint() {
mTextPaint = new TextPaint();
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(getTextSize());
mTextPaint.setColor(mColor);
mTextPaint.setStyle(Paint.Style.FILL);
mTextPaint.setTypeface(getTypeface());
mTextPaintOutline = new TextPaint();
mTextPaintOutline.setAntiAlias(true);
mTextPaintOutline.setTextSize(getTextSize());
mTextPaintOutline.setColor(mBorderColor);
mTextPaintOutline.setStyle(Paint.Style.STROKE);
mTextPaintOutline.setTypeface(getTypeface());
mTextPaintOutline.setStrokeWidth(mBorderSize);
}
public void setText(String text) {
super.setText(text);
mText = text.toString();
requestLayout();
invalidate();
}
public void setTextSize(float size) {
super.setTextSize(size);
requestLayout();
invalidate();
initPaint();
}
public void setTextColor(int color) {
super.setTextColor(color);
mColor = color;
invalidate();
initPaint();
}
public void setShadowLayer(float radius, float dx, float dy, int color) {
super.setShadowLayer(radius, dx, dy, color);
mBorderSize = radius;
mBorderColor = color;
requestLayout();
invalidate();
initPaint();
}
public void setTypeface(Typeface tf, int style) {
super.setTypeface(tf, style);
requestLayout();
invalidate();
initPaint();
}
public void setTypeface(Typeface tf) {
super.setTypeface(tf);
requestLayout();
invalidate();
initPaint();
}
@Override
protected void onDraw(Canvas canvas) {
Layout layout = new StaticLayout(getText(), mTextPaintOutline, getWidth(), Layout.Alignment.ALIGN_CENTER, mSpacingMult, mSpacingAdd, mIncludePad);
layout.draw(canvas);
layout = new StaticLayout(getText(), mTextPaint, getWidth(), Layout.Alignment.ALIGN_CENTER, mSpacingMult, mSpacingAdd, mIncludePad);
layout.draw(canvas);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Layout layout = new StaticLayout(getText(), mTextPaintOutline, measureWidth(widthMeasureSpec), Layout.Alignment.ALIGN_CENTER, mSpacingMult, mSpacingAdd, mIncludePad);
int ex = (int) (mBorderSize * 2 + 1);
setMeasuredDimension(measureWidth(widthMeasureSpec) + ex, measureHeight(heightMeasureSpec) * layout.getLineCount() + ex);
}
private int measureWidth(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
} else {
result = (int) mTextPaintOutline.measureText(mText) + getPaddingLeft() + getPaddingRight();
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
private int measureHeight(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
mAscent = (int) mTextPaintOutline.ascent();
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
} else {
result = (int) (-mAscent + mTextPaintOutline.descent()) + getPaddingTop() + getPaddingBottom();
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
private TextPaint mTextPaint;
private TextPaint mTextPaintOutline;
private String mText = "";
private int mAscent = 0;
private float mBorderSize;
private int mBorderColor;
private int mColor;
private float mSpacingMult = 1.0f;
private float mSpacingAdd = 0;
private boolean mIncludePad = true;
}