package com.howfun.test;

import android.content.Context;

import android.graphics.Canvas;

import android.util.AttributeSet;

import android.view.Gravity;

import android.widget.TextView;

public class VerticalTextView extends TextView{

final boolean topDown;

public VerticalTextView(Context context, AttributeSet attrs){

super(context, attrs);

final int gravity = getGravity();

if(Gravity.isVertical(gravity) && (gravity&Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {

setGravity((gravity&Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);

topDown = false;

}else

topDown = true;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){

super.onMeasure(heightMeasureSpec, widthMeasureSpec);

setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());

}

@Override

protected boolean setFrame(int l, int t, int r, int b){

return super.setFrame(l, t, l+(b-t), t+(r-l));

}

@Override

public void draw(Canvas canvas){

if(topDown){

canvas.translate(getHeight(), 0);

canvas.rotate(90);

}else {

canvas.translate(0, getWidth());

canvas.rotate(-90);

}

canvas.clipRect(0, 0, getWidth(), getHeight(), android.graphics.Region.Op.REPLACE);

super.draw(canvas);

}

}

android:layout_width="450dp"

android:layout_height="450dp"

android:textSize="40sp"

android:layout_marginLeft="100dp"

android:gravity="bottom|right"

android:text="Vertical text"

/>