package com.mm.android.deviceaddmodule.mobilecommon.widget;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.support.v7.widget.AppCompatSeekBar;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.ViewConfiguration;
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import android.view.ViewParent;
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/**
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* 垂直的seekbar
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* <p/>
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*/
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public class VerticalSeekBar extends AppCompatSeekBar {
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private boolean mIsDragging;
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private float mTouchDownY;
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private int mScaledTouchSlop;
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private boolean isInScrollingContainer = false;
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private OnSeekBarChangeListener mOnSeekBarChangeListener;
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private boolean isInScrollingContainer() {
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return isInScrollingContainer;
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}
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public void setInScrollingContainer(boolean isInScrollingContainer) {
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this.isInScrollingContainer = isInScrollingContainer;
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}
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/**
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* On touch, this offset plus the scaled value from the position of the
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* touch will form the progress value. Usually 0.
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*/
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private float mTouchProgressOffset;
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public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mScaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
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}
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public VerticalSeekBar(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public VerticalSeekBar(Context context) {
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super(context);
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}
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@Override
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protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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super.onSizeChanged(h, w, oldh, oldw);
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}
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@Override
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protected synchronized void onMeasure(int widthMeasureSpec,
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int heightMeasureSpec) {
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super.onMeasure(heightMeasureSpec, widthMeasureSpec);
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setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
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}
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@Override
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protected synchronized void onDraw(Canvas canvas) {
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canvas.rotate(-90);
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canvas.translate(-getHeight(), 0);
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super.onDraw(canvas);
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}
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@Override
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public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) {
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super.setOnSeekBarChangeListener(l);
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mOnSeekBarChangeListener = l;
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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if (!isEnabled()) {
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return false;
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}
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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if (isInScrollingContainer()) {
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mTouchDownY = event.getY();
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} else {
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setPressed(true);
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invalidate();
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onStartTrackingTouch();
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trackTouchEvent(event);
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attemptClaimDrag();
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onSizeChanged(getWidth(), getHeight(), 0, 0);
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}
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break;
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case MotionEvent.ACTION_MOVE:
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if (mIsDragging) {
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trackTouchEvent(event);
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} else {
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final float y = event.getY();
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if (Math.abs(y - mTouchDownY) > mScaledTouchSlop) {
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setPressed(true);
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invalidate();
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onStartTrackingTouch();
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trackTouchEvent(event);
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attemptClaimDrag();
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}
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}
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onSizeChanged(getWidth(), getHeight(), 0, 0);
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break;
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case MotionEvent.ACTION_UP:
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if (mIsDragging) {
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trackTouchEvent(event);
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onStopTrackingTouch();
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setPressed(false);
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} else {
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// Touch up when we never crossed the touch slop threshold
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// should
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// be interpreted as a tap-seek to that location.
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onStartTrackingTouch();
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trackTouchEvent(event);
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onStopTrackingTouch();
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}
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onSizeChanged(getWidth(), getHeight(), 0, 0);
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// ProgressBar doesn't know to repaint the thumb drawable
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// in its inactive state when the touch stops (because the
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// value has not apparently changed)
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invalidate();
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break;
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}
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return true;
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}
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private void trackTouchEvent(MotionEvent event) {
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final int height = getHeight();
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final int top = getPaddingTop();
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final int bottom = getPaddingBottom();
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final int available = height - top - bottom;
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int y = (int) event.getY();
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float scale;
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float progress = 0;
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// 下面是最小值
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if (y > height - bottom) {
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scale = 0.0f;
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} else if (y < top) {
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scale = 1.0f;
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} else {
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scale = (float) (available - y + top) / (float) available;
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progress = mTouchProgressOffset;
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}
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final int max = getMax();
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progress += scale * max;
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setProgress((int) progress);
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}
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/**
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* This is called when the user has started touching this widget.
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*/
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private void onStartTrackingTouch() {
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mIsDragging = true;
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if (mOnSeekBarChangeListener != null)
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mOnSeekBarChangeListener.onStartTrackingTouch(this);
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}
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/**
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* This is called when the user either releases his touch or the touch is
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* canceled.
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*/
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private void onStopTrackingTouch() {
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mIsDragging = false;
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if (mOnSeekBarChangeListener != null)
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mOnSeekBarChangeListener.onStopTrackingTouch(this);
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}
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private void attemptClaimDrag() {
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ViewParent p = getParent();
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if (p != null) {
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p.requestDisallowInterceptTouchEvent(true);
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}
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}
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@Override
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public synchronized void setProgress(int progress) {
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super.setProgress(progress);
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onSizeChanged(getWidth(), getHeight(), 0, 0);
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}
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}
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