package com.topnews.view;
import com.topnews.R;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.ViewConfiguration;
import android.view.View.MeasureSpec;
import android.view.accessibility.AccessibilityEvent;
import android.widget.CompoundButton;
public class SwitchButton extends CompoundButton {
private static final int TOUCH_MODE_IDLE = 0;
private static final int TOUCH_MODE_DOWN = 1;
private static final int TOUCH_MODE_DRAGGING = 2;
private static final int SANS = 1;
private static final int SERIF = 2;
private static final int MONOSPACE = 3;
/** Switch���˶��켣 ���ȱ��� */
private Drawable mThumbDrawable;
/** Switch��=������ť�������ذ�ť */
private Drawable mTrackDrawable;
/** Switch������ʵ�� on��off����������С */
private int mThumbTextPadding;
/** Switch�ؼ�����С��� */
private int mSwitchMinWidth;
/** Switch�ؼ���padding����ֵ */
private int mSwitchPadding;
/** Switch�ؼ���ѡ������µ��ַ��� */
private CharSequence mTextOn;
/** Switch�ؼ���δѡ������µ��ַ��� */
private CharSequence mTextOff;
/** Switch�ؼ��Ĵ���ʱ���ģʽ */
private int mTouchMode;
private int mTouchSlop;
private float mTouchX;
private float mTouchY;
private VelocityTracker mVelocityTracker = VelocityTracker.obtain();
private int mMinFlingVelocity;
private float mThumbPosition;
private int mSwitchWidth;
private int mSwitchHeight;
private int mThumbWidth;
private int mSwitchLeft;
private int mSwitchTop;
private int mSwitchRight;
private int mSwitchBottom;
/** text�Ļ��ʹ��� */
private TextPaint mTextPaint;
private ColorStateList mTextColors;
private Layout mOnLayout;
private Layout mOffLayout;
private Context mContext;
@SuppressWarnings("hiding")
private final Rect mTempRect = new Rect();
private static final int[] CHECKED_STATE_SET = { android.R.attr.state_checked };
public SwitchButton(Context context) {
this(context, null);
mContext = context;
}
public SwitchButton(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.switchStyle);
mContext = context;
}
public SwitchButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
Resources res = getResources();
mTextPaint.density = res.getDisplayMetrics().density;
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.SwitchButton, defStyle, 0);// �������ļ��л�ȡ�������
mThumbDrawable = a.getDrawable(R.styleable.SwitchButton_thumb);// ��ȡ���õĹ켣��Դ
mTrackDrawable = a.getDrawable(R.styleable.SwitchButton_track);// ��ȡ���õĿ�����Դ
mTextOn = a.getText(R.styleable.SwitchButton_textOn);// ��ȡ������ ѡ������µ���ʾ����
// on
mTextOff = a.getText(R.styleable.SwitchButton_textOff);// ��ȡ���õ�
// Ϊѡ������µ���ʾ����
// off
mThumbTextPadding = a.getDimensionPixelSize(
R.styleable.SwitchButton_thumbTextPadding, 0);// ��ȡ���õİ�ť�����С
mSwitchMinWidth = a.getDimensionPixelSize(
R.styleable.SwitchButton_switchMinWidth, 0);// ��ȡ���õ���С���
mSwitchPadding = a.getDimensionPixelSize(
R.styleable.SwitchButton_switchPadding, 0);// ��ȡ���õ�padding����
int appearance = a.getResourceId(
R.styleable.SwitchButton_switchTextAppearance, 0);// ��ȡ�����ļ��л�ȡ��ʾ�����ʽ
// �ж��趨��ʽ�Ƿ���ڣ����ڵĻ���ֵ
if (appearance != 0) {
setSwitchTextAppearance(context, appearance);
}
a.recycle();// ���������ļ���Դ
ViewConfiguration config = ViewConfiguration.get(context);
mTouchSlop = config.getScaledTouchSlop();
mMinFlingVelocity = config.getScaledMinimumFlingVelocity();
refreshDrawableState();
setChecked(isChecked());
}
/**
* ����on,off��ʾ�������С����ʽ
* */
public void setSwitchTextAppearance(Context context, int resid) {
mContext = context;
TypedArray appearance = context.obtainStyledAttributes(resid,
R.styleable.TextAppearance);
ColorStateList colors;
int ts;
colors = appearance
.getColorStateList(R.styleable.TextAppearance_textColor);
if (colors != null) {
mTextColors = colors;
} else {
mTextColors = getTextColors();
}
ts = appearance.getDimensionPixelSize(
R.styleable.TextAppearance_textSize, 0);
if (ts != 0) {
if (ts != mTextPaint.getTextSize()) {
mTextPaint.setTextSize(ts);
requestLayout();
}
}
int typefaceIndex, styleIndex;
typefaceIndex = appearance.getInt(R.styleable.TextAppearance_typeface,
-1);
styleIndex = appearance
.getInt(R.styleable.TextAppearance_textStyle, -1);
setSwitchTypefaceByIndex(typefaceIndex, styleIndex);
appearance.recycle();// ���������ļ���Դ
}
/** �����Զ�����������ԣ����������� */
private void setSwitchTypefaceByIndex(int typefaceIndex, int styleIndex) {
Typeface tf = null;
switch (typefaceIndex) {
case SANS:
tf = Typeface.SANS_SERIF;// Ĭ�ϵ�����������
break;
case SERIF:
tf = Typeface.SERIF;// Ĭ�ϵij���������
break;
case MONOSPACE:
tf = Typeface.MONOSPACE;// Ĭ�ϵĵȿ�����������
break;
}
setSwitchTypeface(tf, styleIndex);
}
/** ���������� */
public void setSwitchTypeface(Typeface tf, int style) {
if (style > 0) {
if (tf == null) {
tf = Typeface.defaultFromStyle(style);
} else {
tf = Typeface.create(tf, style);
}
setSwitchTypeface(tf);
int typefaceStyle = tf != null ? tf.getStyle() : 0;
int need = style & ~typefaceStyle;
mTextPaint.setFakeBoldText((need & Typeface.BOLD) != 0);
mTextPaint.setTextSkewX((need & Typeface.ITALIC) != 0 ? -0.25f : 0);
} else {
mTextPaint.setFakeBoldText(false);
mTextPaint.setTextSkewX(0);
setSwitchTypeface(tf);
}
}
public void setSwitchTypeface(Typeface tf) {
if (mTextPaint.getTypeface() != tf) {
mTextPaint.setTypeface(tf);
requestLayout();
invalidate();
}
}
/** ��ȡѡ��״̬�µ���ʾ���� */
public CharSequence getTextOn() {
return mTextOn;
}
/** �趨ѡ��״̬�µ���ʾ���� */
public void setTextOn(CharSequence textOn) {
mTextOn = textOn;
requestLayout();
}
/** ��ȡ��ѡ��״̬�µ���ʾ���� */
public CharSequence getTextOff() {
return mTextOff;
}
/** �趨��ѡ��״̬�µ���ʾ���� */
public void setTextOff(CharSequence textOff) {
mTextOff = textOff;
requestLayout();
}
/** �����ؼ���ߣ�����ͼʱʹ�á� */
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
if (mOnLayout == null) {
mOnLayout = makeLayout(mTextOn);
}
if (mOffLayout == null) {
mOffLayout = makeLayout(mTextOff);
}
mTrackDrawable.getPadding(mTempRect);
final int maxTextWidth = Math.max(mOnLayout.getWidth(),
mOffLayout.getWidth());
final int switchWidth = Math.max(mSwitchMinWidth, maxTextWidth * 2
+ mThumbTextPadding * 4 + mTempRect.left + mTempRect.right);
final int switchHeight = mTrackDrawable.getIntrinsicHeight();
mThumbWidth = maxTextWidth + mThumbTextPadding * 2;
switch (widthMode) {
case MeasureSpec.AT_MOST:
widthSize = Math.min(widthSize, switchWidth);
break;
case MeasureSpec.UNSPECIFIED:
widthSize = switchWidth;
break;
case MeasureSpec.EXACTLY:
break;
}
switch (heightMode) {
case MeasureSpec.AT_MOST:
heightSize = Math.min(heightSize, switchHeight);
break;
case MeasureSpec.UNSPECIFIED:
heightSize = switchHeight;
break;
case MeasureSpec.EXACTLY:
break;
}
mSwitchWidth = switchWidth;
mSwitchHeight = switchHeight;
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int measuredHeight = getMeasuredHeight();
if (measuredHeight < switchHeight) {
setMeasuredDimension(getMeasuredWidth(), switchHeight);
}
}
@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
populateAccessibilityEvent(event);
return false;
}
public void populateAccessibilityEvent(AccessibilityEvent event) {
if (isChecked()) {
CharSequence text = mOnLayout.getText();
if (TextUtils.isEmpty(text)) {
text = mContext.getString(R.string.switch_on);
}
event.getText().add(text);
} else {
CharSequence text = mOffLayout.getText();
if (TextUtils.isEmpty(text)) {
text = mContext.getString(R.string.switch_off);
}
event.getText().add(text);
}
}
private Layout makeLayout(CharSequence text) {
return new StaticLayout(text, mTextPaint, (int) Math.ceil(Layout
.getDesiredWidth(text, mTextPaint)),
Layout.Alignment.ALIGN_NORMAL, 1.f, 0, true);
}
/**
* @������return true ˵��������(x,y)Ŀ��������
*/
private boolean hitThumb(float x, float y) {
mThumbDrawable.getPadding(mTempRect);
final int thumbTop = mSwitchTop - mTouchSlop;
final int thumbLeft = mSwitchLeft + (int) (mThumbPosition + 0.5f)
- mTouchSlop;
final int thumbRight = thumbLeft + mThumbWidth + mTempRect.left
+ mTempRect.right + mTouchSlop;
final int thumbBottom = mSwitchBottom + mTouchSlop;
return x > thumbLeft && x < thumbRight && y > thumbTop
&& y < thumbBottom;
}
/** ���ݴ����������¼� */
@Override
public boolean onTouchEvent(MotionEvent ev) {
mVelocityTracker.addMovement(ev);
final int action = ev.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
if (isEnabled() && hitThumb(x, y)) {
mTouchMode = TOUCH_MODE_DOWN;
mTouchX = x;
mTouchY = y;
}
break;
}
case MotionEvent.ACTION_MOVE: {
switch (mTouchMode) {
case TOUCH_MODE_IDLE:
return true;
case TOUCH_MODE_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
if (Math.abs(x - mTouchX) > mTouchSlop
|| Math.abs(y - mTouchY) > mTouchSlop) {
mTouchMode = TOUCH_MODE_DRAGGING;
getParent().requestDisallowInterceptTouchEvent(true);
mTouchX = x;
mTouchY = y;
return true;
}
break;
}
case TOUCH_MODE_DRAGGING: {
final float x = ev.getX();
final float dx = x - mTouchX;
float newPos = Math.max(0,
Math.min(mThumbPosition + dx, getThumbScrollRange()));
if (newPos != mThumbPosition) {
mThumbPosition = newPos;
mTouchX = x;
invalidate();
}
return true;
}
}
break;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
if (mTouchMode == TOUCH_MODE_DRAGGING) {
stopDrag(ev);
return true;
}
mTouchMode = TOUCH_MODE_IDLE;
mVelocityTracker.clear();
break;
}
}
return super.onTouchEvent(ev);
}
private void cancelSuperTouch(MotionEvent ev) {
MotionEvent cancel = MotionEvent.obtain(ev);
cancel.setAction(MotionEvent.ACTION_CANCEL);
super.onTouchEvent(cancel);
cancel.recycle();
}
private void stopDrag(MotionEvent ev) {
mTouchMode = TOUCH_MODE_IDLE;
boolean commitChange = ev.getAction() == MotionEvent.ACTION_UP
&& isEnabled();
cancelSuperTouch(ev);
if (commitChange) {
boolean newState;
mVelocityTracker.computeCurrentVelocity(1000);
float xvel = mVelocityTracker.getXVelocity();
if (Math.abs(xvel) > mMinFlingVelocity) {
newState = xvel > 0;
} else {
newState = getTargetCheckedState();
}
animateThumbToCheckedState(newState);
} else {
animateThumbToCheckedState(isChecked());
}
}
private void animateThumbToCheckedState(boolean newCheckedState) {
setChecked(newCheckedState);
}
private boolean getTargetCheckedState() {
return mThumbPosition >= getThumbScrollRange() / 2;
}
// ����ѡ�е�״̬��ѡ��:true ��ѡ��: false��
@Override
public void setChecked(boolean checked) {
super.setChecked(checked);
mThumbPosition = checked ? getThumbScrollRange() : 0;
invalidate();
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
mThumbPosition = isChecked() ? getThumbScrollRange() : 0;
int switchRight = getWidth() - getPaddingRight();
int switchLeft = switchRight - mSwitchWidth;
int switchTop = 0;
int switchBottom = 0;
switch (getGravity() & Gravity.VERTICAL_GRAVITY_MASK) {
default:
case Gravity.TOP:
switchTop = getPaddingTop();
switchBottom = switchTop + mSwitchHeight;
break;
case Gravity.CENTER_VERTICAL:
switchTop = (getPaddingTop() + getHeight() - getPaddingBottom())
/ 2 - mSwitchHeight / 2;
switchBottom = switchTop + mSwitchHeight;
break;
case Gravity.BOTTOM:
switchBottom = getHeight() - getPaddingBottom();
switchTop = switchBottom - mSwitchHeight;
break;
}
mSwitchLeft = switchLeft;
mSwitchTop = switchTop;
mSwitchBottom = switchBottom;
mSwitchRight = switchRight;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int switchLeft = mSwitchLeft;
int switchTop = mSwitchTop;
int switchRight = mSwitchRight;
int switchBottom = mSwitchBottom;
mTrackDrawable.setBounds(switchLeft, switchTop, switchRight,
switchBottom);
mTrackDrawable.draw(canvas);
canvas.save();
mTrackDrawable.getPadding(mTempRect);
int switchInnerLeft = switchLeft + mTempRect.left;
int switchInnerTop = switchTop + mTempRect.top;
int switchInnerRight = switchRight - mTempRect.right;
int switchInnerBottom = switchBottom - mTempRect.bottom;
canvas.clipRect(switchInnerLeft, switchTop, switchInnerRight,
switchBottom);
mThumbDrawable.getPadding(mTempRect);
final int thumbPos = (int) (mThumbPosition + 0.5f);
int thumbLeft = switchInnerLeft - mTempRect.left + thumbPos;
int thumbRight = switchInnerLeft + thumbPos + mThumbWidth
+ mTempRect.right;
mThumbDrawable
.setBounds(thumbLeft, switchTop, thumbRight, switchBottom);
mThumbDrawable.draw(canvas);
if (mTextColors != null) {
mTextPaint.setColor(mTextColors.getColorForState(
getDrawableState(), mTextColors.getDefaultColor()));
}
mTextPaint.drawableState = getDrawableState();
Layout switchText = getTargetCheckedState() ? mOnLayout : mOffLayout;
canvas.translate(
(thumbLeft + thumbRight) / 2 - switchText.getWidth() / 2,
(switchInnerTop + switchInnerBottom) / 2
- switchText.getHeight() / 2);
switchText.draw(canvas);
canvas.restore();
}
@Override
public int getCompoundPaddingRight() {
int padding = super.getCompoundPaddingRight() + mSwitchWidth;
if (!TextUtils.isEmpty(getText())) {
padding += mSwitchPadding;
}
return padding;
}
private int getThumbScrollRange() {
if (mTrackDrawable == null) {
return 0;
}
mTrackDrawable.getPadding(mTempRect);
return mSwitchWidth - mThumbWidth - mTempRect.left - mTempRect.right;
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
int[] myDrawableState = getDrawableState();
if (mThumbDrawable != null)
mThumbDrawable.setState(myDrawableState);
if (mTrackDrawable != null)
mTrackDrawable.setState(myDrawableState);
invalidate();
}
@Override
protected boolean verifyDrawable(Drawable who) {
return super.verifyDrawable(who) || who == mThumbDrawable
|| who == mTrackDrawable;
}
}