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/*
* Copyright (C) 2014 Cyanogen, Inc.
*/
package com.cyngn.theme.widget;
import android.content.Context;
import android.graphics.Paint;
import android.text.method.TransformationMethod;
import android.text.method.AllCapsTransformationMethod;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
/**
* Change the font size to match the measured
* textview size by width
*
*/
public class FittedTextView extends TextView {
private Paint mPaint;
//If set to true, the text will be resized to fit the view.
private boolean mAutoFitText = true;
//Used to instruct whether the text should be expanded to fill out the view, even if the text
//fits without being resized
private boolean mAutoExpand = true;
public FittedTextView(Context context) {
this(context, null);
}
public FittedTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FittedTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mPaint = new Paint();
}
protected void setAutoFitText(boolean autoFit) {
mAutoFitText = autoFit;
}
protected boolean getAutoFitText() {
return mAutoFitText;
}
protected void setAutoExpand(boolean autoExpand) {
mAutoExpand = autoExpand;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (!mAutoFitText) return;
final float THRESHOLD = 0.5f;
final float TARGET_WIDTH = getMeasuredWidth();
String text = getText().toString();
TransformationMethod tm = getTransformationMethod();
if (tm != null && tm instanceof AllCapsTransformationMethod) {
text = getText().toString().toUpperCase();
}
mPaint.set(getPaint());
if (mPaint.measureText(text) <= TARGET_WIDTH && !mAutoExpand) return;
float max = 200;
float min = 2;
while(max > min) {
float size = (max+min) / 2;
mPaint.setTextSize(size);
float measuredWidth = mPaint.measureText(text);
if (Math.abs(TARGET_WIDTH - measuredWidth) <= THRESHOLD) {
break;
} else if (measuredWidth > TARGET_WIDTH) {
max = size-1;
} else {
min = size+1;
}
}
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, min-1);
}
}
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