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android-misc-widgets多方抽屉bug修复版 解决“闪烁”有关问题

热度：154   发布时间：2016-05-01 20:30:10.0
android-misc-widgets多方抽屉bug修复版 解决“闪烁”问题

前几天项目需要用到左侧拉出抽屉，想到了http://blog.csdn.net/hellogv/article/details/6264706中提到的多方抽屉，拿来试用了下，发现bug还真不少，最不能忍受的是最后那一下“闪烁”，于是乎，改！
下面将修改过程中遇到的问题及其解决方法分享给大家。

首先是出现了如图的情况：

当以光的速度点击handle（就是那个带箭头的Button）并拉出到很远很远的地方 就出先上边那个神奇的现象了

寻找原因，发现是这里的问题

[java]?view plaincopy
  1. <span?style="white-space:pre">????????????</span>if?(tmpX?!=?mTrackX?||?tmpY?!=?mTrackY)??
  2. ????????????{??
  3. ????????????????mTrackX?=?tmpX;??
  4. ????????????????mTrackY?=?tmpY;??
  5. ????????????????//?invalidate();?//放在此导致极快速滑动至touch区域外界面不刷新（mTrackX、mTrackY均为0）??
  6. ????????????}??
  7. ????????????invalidate();??


?

就拿上边那种情况来讲

当瞬间将handle拉至最大位置，即 tmpX=0 的位置，由于mTrackX默认为0，if条件不成立，执行不到invalidate()方法，页面没有刷新

将invalidate()方法移到if'条件语句之外即可解决问题


下一问题：onFling方法在将抽屉快速抽出时基本不能用

抽出来~滑进去~抽出来~滑进去~ ? ? (这个抽屉带弹簧的@_@?!)

究其原因，在这里

?

[java]?view plaincopy
  1. public?boolean?onFling(MotionEvent?e1,?MotionEvent?e2,?float?velocityX,?float?velocityY)?{??
  2. ????????mState?=?State.FLYING;??
  3. ????????mVelocity?=?mOrientation?==?VERTICAL??velocityY?:?velocityX;??
  4. ????????post(startAnimation);??
  5. ????????return?true;??
  6. ????}??

?

mVelocity 使用的是onFling方法传进来的参数velocityX，经多次打印log发现velocityX为负数大致看了下源码，这个速度是基于getX()方法算出来的是
大家都知道，getX()方法是获取以widget左上角为坐标原点计算的Ｘ轴坐标值（不知道的看这里：http://blog.csdn.net/lovehong0306/article/details/7451507）
由此推想而知
1.点击handle（此时content为GONE），这时的getX()得到的是以handle左上角为原点的坐标

2.快速滑动以发动onFling方法（快到只有两个event事件发生），这时getX()得到的依然是以handle的左上角为原点的坐标，但是由于content已经可见，handle的位置发生了变化，为抽屉完全抽出时的位置，而action_up事件发生时的getX()得到是在handle原点的左边，即为负值，用此时的X坐标值减去之前得到的那个正的坐标值，结果当然是负的了

3.有负的偏移量和时间，计算出来的速度也就是负的了

这就是为什么拉出抽屉后会滑进去的原因了


修改为如下即可解决：

?

[java]?view plaincopy
  1. @Override??
  2. ????????public?boolean?onFling(MotionEvent?e1,?MotionEvent?e2,?float?velocityX,??
  3. ????????????????float?velocityY)??
  4. ????????{??
  5. ????????????mState?=?State.FLYING;??
  6. ??
  7. ????????????float?velocityX2,?velocityY2;??
  8. ????????????if?(lastRawX?==?-1?&&?lastRawY?==?-1)???//见onScroll方法??
  9. ????????????{??
  10. ????????????????velocityX2?=?(curRawX?-?e1.getRawX())??
  11. ????????????????????????/?(curEventTime?-?e1.getEventTime())?*?1000;?//??px/s??
  12. ????????????????velocityY2?=?(curRawY?-?e1.getRawY())??
  13. ????????????????????????/?(curEventTime?-?e1.getEventTime())?*?1000;??
  14. ????????????}??
  15. ????????????else??
  16. ????????????{??
  17. ????????????????velocityX2?=?(curRawX?-?lastRawX)??
  18. ????????????????????????/?(curEventTime?-?lastEventTime)?*?1000;??
  19. ????????????????velocityY2?=?(curRawY?-?lastRawY)??
  20. ????????????????????????/?(curEventTime?-?lastEventTime)?*?1000;??
  21. ????????????}??
  22. ??
  23. ????????????mVelocity?=?mOrientation?==?VERTICAL???velocityY2?:?velocityX2;??
  24. ??
  25. ????????????if?(Math.abs(mVelocity)?>?50)??
  26. ????????????{??
  27. ????????????????if?(mVelocity?>?0)??
  28. ????????????????{??
  29. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  30. ????????????????}??
  31. ????????????????else??
  32. ????????????????{??
  33. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  34. ????????????????}??
  35. ??
  36. ????????????????long?now?=?SystemClock.uptimeMillis();??
  37. ????????????????mAnimationLastTime?=?now;??
  38. ????????????????mCurrentAnimationTime?=?now?+?ANIMATION_FRAME_DURATION;??
  39. ????????????????mAnimating?=?true;??
  40. ????????????????mHandler.removeMessages(MSG_ANIMATE);??
  41. ????????????????mHandler.removeMessages(MSG_PREPARE_ANIMATE);??
  42. ????????????????mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE),??
  43. ????????????????????????mCurrentAnimationTime);??
  44. ????????????????return?true;??
  45. ????????????}??
  46. ????????????return?false;??
  47. ????????}??

?

代码就不多做解释了，命名还算规范，应该能看懂，最后那几行是为解决“闪烁”问题的

下面就来说下最棘手的问题——“闪烁”


那么为什么会闪烁呢？

经多次尝试，发现是动画与setVisibility(GONG)冲突，当把动画设置为setFillAfter(true)后即可发现，动画结束后设置控件setVisibility(GONG)，消失的不仅仅是content，handle也一同消失了。

由此可知handle在动画结束后先消失再出现，于是就出现了闪烁的效果


那么好办，只要把content和handle分别同时设置动画不就行了，content在动画结束后setVisibility(GONG)，handle不setVisibility(GONG)。

But，这么尝试了一下发现，虽然“几乎”同时start动画，毕竟还是有时间间隔的，机子性能越差越明显，content和handle分开了！！！

此法行不通，另想他法


源码真是个好东西，看看SlidingDrawer是怎么实现的

原来如此，没用系统动画，利用handler重复改变控件位置

好，就按照这个思路，结合当前代码，改！

（完整代码稍后贴出）

把所有post(startAnimation)替换成：

?

[java]?view plaincopy
  1. long?now?=?SystemClock.uptimeMillis();??
  2. ????????????????mAnimationLastTime?=?now;??
  3. ????????????????mCurrentAnimationTime?=?now?+?ANIMATION_FRAME_DURATION;??
  4. ????????????????mAnimating?=?true;??
  5. ????????????????mHandler.removeMessages(MSG_ANIMATE);??
  6. ????????????????mHandler.removeMessages(MSG_PREPARE_ANIMATE);??
  7. ????????????????mHandler.sendMessageAtTime(??
  8. ????????????????????????mHandler.obtainMessage(MSG_PREPARE_ANIMATE),??
  9. ????????????????????????mCurrentAnimationTime);??


这段代码基本上是从SlidingDrawer源码copy过来的，MSG_PREPARE_ANIMATE是自己加的

起初不明白ANIMATION_FRAME_DURATION的作用，为什么要延迟呢？

后来发现，这个延迟是留给onLayout方法的，如果不加这个延迟，后边用到的方法就可能在onLayout方法之前调用，也就导致了在onLayout方法之前用到了mContentWidth或者mContentHeight，此时的值为0，这也是为什么要另加MSG_PREPARE_ANIMATE


prepareAnimation方法代码如下：

?

[java]?view plaincopy
  1. private?void?prepareAnimation()??
  2. ????{??
  3. ??
  4. ????????switch?(mPosition)??
  5. ????????{??
  6. ????????????case?LEFT:??
  7. ????????????????if?(mIsShrinking)??
  8. ????????????????{??
  9. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  10. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  11. ??
  12. ????????????????}??
  13. ????????????????else??
  14. ????????????????{??
  15. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  16. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  17. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  18. ????????????????????{??
  19. ????????????????????????mTrackX?=?-mContentWidth;??
  20. ????????????????????}??
  21. ????????????????}??
  22. ????????????????break;??
  23. ????????????case?RIGHT:??
  24. ????????????????if?(mIsShrinking)??
  25. ????????????????{??
  26. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  27. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  28. ????????????????}??
  29. ????????????????else??
  30. ????????????????{??
  31. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  32. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  33. ??
  34. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  35. ????????????????????{??
  36. ????????????????????????mTrackX?=?mContentWidth;??
  37. ????????????????????}??
  38. ????????????????}??
  39. ????????????????break;??
  40. ????????????case?TOP:??
  41. ????????????????if?(mIsShrinking)??
  42. ????????????????{??
  43. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  44. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  45. ????????????????}??
  46. ????????????????else??
  47. ????????????????{??
  48. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  49. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  50. ??
  51. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  52. ????????????????????{??
  53. ????????????????????????mTrackY?=?-mContentHeight;??
  54. ????????????????????}??
  55. ????????????????}??
  56. ????????????????break;??
  57. ????????????case?BOTTOM:??
  58. ????????????????if?(mIsShrinking)??
  59. ????????????????{??
  60. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  61. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  62. ????????????????}??
  63. ????????????????else??
  64. ????????????????{??
  65. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  66. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  67. ??
  68. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  69. ????????????????????{??
  70. ????????????????????????mTrackY?=?mContentHeight;??
  71. ????????????????????}??
  72. ????????????????}??
  73. ????????????????break;??
  74. ????????}??
  75. ??
  76. ????????if?(mState?==?State.TRACKING)??
  77. ????????{??
  78. ????????????if?(mIsShrinking)??
  79. ????????????{??
  80. ????????????????if?((mOrientation?==?VERTICAL?&&?Math.abs(mTrackY)?<?mContentHeight?/?2)??
  81. ????????????????????????||?(mOrientation?==?HORIZONTAL?&&?Math.abs(mTrackX)?<?mContentWidth?<span?style="white-space:pre">?????????????????????</span>/?2))??
  82. ????????????????{??
  83. ????????????????????mVelocity?=?-mVelocity;??
  84. ????????????????????mAnimatedAcceleration?=?-mAnimatedAcceleration;??
  85. ????????????????????mIsShrinking?=?!mIsShrinking;??
  86. ????????????????}??
  87. ????????????}??
  88. ????????????else??
  89. ????????????{??
  90. ????????????????if?((mOrientation?==?VERTICAL?&&?Math.abs(mTrackY)?>?mContentHeight?/?2)??
  91. ????????????????????????||?(mOrientation?==?HORIZONTAL?&&?Math.abs(mTrackX)?>?mContentWidth?<span?style="white-space:pre">?????????????????????</span>/?2))??
  92. ????????????????{??
  93. ????????????????????mVelocity?=?-mVelocity;??
  94. ????????????????????mAnimatedAcceleration?=?-mAnimatedAcceleration;??
  95. ????????????????????mIsShrinking?=?!mIsShrinking;??
  96. ????????????????}??
  97. ????????????}??
  98. ????????}??
  99. ????????if?(mState?!=?State.FLYING?&&?mState?!=?State.TRACKING)??
  100. ????????{??
  101. ????????????mState?=?State.CLICK;??
  102. ????????}??
  103. ????}??


其中类似

[java]?view plaincopy
  1. if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  2. ????????????{??
  3. ????????????????mTrackX?=?-mContentWidth;??
  4. ????????????}??

代码是为解决初次使用控件初始化mTrackX，否则此时单击handle会导致控件直接抽出，无动画效果


?

[java]?view plaincopy
  1. if?(mState?==?State.TRACKING)??
  2. ????????{??
  3. ????????????if?(mIsShrinking)??
  4. ????????????{??
  5. ????????????????if?((mOrientation?==?VERTICAL?&&?Math.abs(mTrackY)?<?mContentHeight?/?2)??
  6. ????????????????????????||?(mOrientation?==?HORIZONTAL?&&?Math.abs(mTrackX)?<?mContentWidth?<span?style="white-space:pre">?????????????????????</span>/?2))??
  7. ????????????????{??
  8. ????????????????????mVelocity?=?-mVelocity;??
  9. ????????????????????mAnimatedAcceleration?=?-mAnimatedAcceleration;??
  10. ????????????????????mIsShrinking?=?!mIsShrinking;??
  11. ????????????????}??
  12. ????????????}??
  13. ????????????else??
  14. ????????????{??
  15. ????????????????if?((mOrientation?==?VERTICAL?&&?Math.abs(mTrackY)?>?mContentHeight?/?2)??
  16. ????????????????????????||?(mOrientation?==?HORIZONTAL?&&?Math.abs(mTrackX)?>?mContentWidth?<span?style="white-space:pre">?????????????????????</span>/?2))??
  17. ????????????????{??
  18. ????????????????????mVelocity?=?-mVelocity;??
  19. ????????????????????mAnimatedAcceleration?=?-mAnimatedAcceleration;??
  20. ????????????????????mIsShrinking?=?!mIsShrinking;??
  21. ????????????????}??
  22. ????????????}??
  23. ????????}??


这段代码是判断抽屉拉出是否过半，也就是决定控件在松开鼠标时是回到关闭状态还是抽出状态

?

doAnimation()方法比较简单，没啥可讲的


之前的变量?mDuration?mLinearFlying?mInterpolator 没用到，因为感觉没啥用，目前的控件已能满足大部分人需求，有特殊需求的请自行添加


下面上完整代码，不懂的可以留言问我

初次写博文，不周之处，还请见谅


Panel.java

?

[java]?view plaincopy
  1. package?org.miscwidgets.widget;??
  2. ??
  3. import?org.miscwidgets.R;??
  4. ??
  5. import?android.content.Context;??
  6. import?android.content.res.TypedArray;??
  7. import?android.graphics.Canvas;??
  8. import?android.graphics.drawable.Drawable;??
  9. import?android.os.Handler;??
  10. import?android.os.Message;??
  11. import?android.os.SystemClock;??
  12. import?android.util.AttributeSet;??
  13. import?android.util.Log;??
  14. import?android.view.GestureDetector;??
  15. import?android.view.MotionEvent;??
  16. import?android.view.View;??
  17. import?android.view.ViewGroup;??
  18. import?android.view.ViewParent;??
  19. import?android.view.GestureDetector.OnGestureListener;??
  20. import?android.view.animation.Interpolator;??
  21. import?android.widget.FrameLayout;??
  22. import?android.widget.LinearLayout;??
  23. /**?
  24. ?*??
  25. ?*?Fixed?by?http://blog.csdn.net/lovehong0306/article/details/7451264?
  26. ?*??
  27. ?*/??
  28. public?class?Panel?extends?LinearLayout??
  29. {??
  30. ??
  31. ????private?static?final?String?TAG?=?"Panel";??
  32. ??
  33. ????private?static?final?float?MAXIMUM_MAJOR_VELOCITY?=?200.0f;??
  34. ????private?static?final?float?MAXIMUM_ACCELERATION?=?2000.0f;??
  35. ????private?static?final?int?MSG_ANIMATE?=?1000;??
  36. ????private?static?final?int?MSG_PREPARE_ANIMATE?=?2000;??
  37. ????private?static?final?int?ANIMATION_FRAME_DURATION?=?1000?/?60;??
  38. ??
  39. ????private?final?Handler?mHandler?=?new?SlidingHandler();??
  40. ????private?float?mAnimatedAcceleration;??
  41. ????private?long?mAnimationLastTime;??
  42. ????private?long?mCurrentAnimationTime;??
  43. ????private?boolean?mAnimating;??
  44. ??
  45. ????private?final?int?mMaximumMajorVelocity;??
  46. ????private?final?int?mMaximumAcceleration;??
  47. ??
  48. ????private?float?lastRawX,?lastRawY,?curRawX,?curRawY;??
  49. ????private?float?lastEventTime,?curEventTime;??
  50. ??
  51. ????/**?
  52. ?????*?Callback?invoked?when?the?panel?is?opened/closed.?
  53. ?????*/??
  54. ????public?static?interface?OnPanelListener??
  55. ????{??
  56. ????????/**?
  57. ?????????*?Invoked?when?the?panel?becomes?fully?closed.?
  58. ?????????*/??
  59. ????????public?void?onPanelClosed(Panel?panel);??
  60. ??
  61. ????????/**?
  62. ?????????*?Invoked?when?the?panel?becomes?fully?opened.?
  63. ?????????*/??
  64. ????????public?void?onPanelOpened(Panel?panel);??
  65. ????}??
  66. ??
  67. ????private?boolean?mIsShrinking;??
  68. ????private?int?mPosition;??
  69. ????private?int?mDuration;??
  70. ????private?boolean?mLinearFlying;??
  71. ????private?int?mHandleId;??
  72. ????private?int?mContentId;??
  73. ????private?View?mHandle;??
  74. ????private?View?mContent;??
  75. ????private?Drawable?mOpenedHandle;??
  76. ????private?Drawable?mClosedHandle;??
  77. ????private?float?mTrackX;??
  78. ????private?float?mTrackY;??
  79. ????private?float?mVelocity;??
  80. ??
  81. ????private?OnPanelListener?panelListener;??
  82. ??
  83. ????public?static?final?int?TOP?=?0;??
  84. ????public?static?final?int?BOTTOM?=?1;??
  85. ????public?static?final?int?LEFT?=?2;??
  86. ????public?static?final?int?RIGHT?=?3;??
  87. ??
  88. ????private?enum?State??
  89. ????{??
  90. ????????ABOUT_TO_ANIMATE,?ANIMATING,?READY,?TRACKING,?FLYING,?CLICK??
  91. ????};??
  92. ??
  93. ????private?State?mState;??
  94. ????private?Interpolator?mInterpolator;??
  95. ????private?GestureDetector?mGestureDetector;??
  96. ????private?int?mContentHeight;??
  97. ????private?int?mContentWidth;??
  98. ????private?int?mOrientation;??
  99. ????private?float?mWeight;??
  100. ????private?PanelOnGestureListener?mGestureListener;??
  101. ????private?boolean?mBringToFront;??
  102. ??
  103. ????public?Panel(Context?context,?AttributeSet?attrs)??
  104. ????{??
  105. ????????super(context,?attrs);??
  106. ????????TypedArray?a?=?context.obtainStyledAttributes(attrs,?R.styleable.Panel);??
  107. ????????mDuration?=?a.getInteger(R.styleable.Panel_animationDuration,?750);?????//?duration?defaults?to?750?ms??
  108. ????????mPosition?=?a.getInteger(R.styleable.Panel_position,?BOTTOM);???????????//?position?defaults?to?BOTTOM??
  109. ????????mLinearFlying?=?a.getBoolean(R.styleable.Panel_linearFlying,?false);????//?linearFlying?defaults?to?false??
  110. ????????mWeight?=?a.getFraction(R.styleable.Panel_weight,?0,?1,?0.0f);??????????//?weight?defaults?to?0.0??
  111. ????????if?(mWeight?<?0?||?mWeight?>?1)??
  112. ????????{??
  113. ????????????mWeight?=?0.0f;??
  114. ????????????Log.w(TAG,?a.getPositionDescription()??
  115. ????????????????????+?":?weight?must?be?>?0?and?<=?1");??
  116. ????????}??
  117. ????????mOpenedHandle?=?a.getDrawable(R.styleable.Panel_openedHandle);??
  118. ????????mClosedHandle?=?a.getDrawable(R.styleable.Panel_closedHandle);??
  119. ??
  120. ????????RuntimeException?e?=?null;??
  121. ????????mHandleId?=?a.getResourceId(R.styleable.Panel_handle,?0);??
  122. ????????if?(mHandleId?==?0)??
  123. ????????{??
  124. ????????????e?=?new?IllegalArgumentException(??
  125. ????????????????????a.getPositionDescription()??
  126. ????????????????????????????+?":?The?handle?attribute?is?required?and?must?refer?to?a?valid?child.");??
  127. ????????}??
  128. ????????mContentId?=?a.getResourceId(R.styleable.Panel_content,?0);??
  129. ????????if?(mContentId?==?0)??
  130. ????????{??
  131. ????????????e?=?new?IllegalArgumentException(??
  132. ????????????????????a.getPositionDescription()??
  133. ????????????????????????????+?":?The?content?attribute?is?required?and?must?refer?to?a?valid?child.");??
  134. ????????}??
  135. ????????a.recycle();??
  136. ??
  137. ????????final?float?density?=?getResources().getDisplayMetrics().density;??
  138. ????????mMaximumMajorVelocity?=?(int)?(MAXIMUM_MAJOR_VELOCITY?*?density?+?0.5f);??
  139. ????????mMaximumAcceleration?=?(int)?(MAXIMUM_ACCELERATION?*?density?+?0.5f);??
  140. ??
  141. ????????if?(e?!=?null)??
  142. ????????{??
  143. ????????????throw?e;??
  144. ????????}??
  145. ????????mOrientation?=?(mPosition?==?TOP?||?mPosition?==?BOTTOM)???VERTICAL??
  146. ????????????????:?HORIZONTAL;??
  147. ????????setOrientation(mOrientation);??
  148. ????????mState?=?State.READY;??
  149. ????????mGestureListener?=?new?PanelOnGestureListener();??
  150. ????????mGestureDetector?=?new?GestureDetector(mGestureListener);??
  151. ????????mGestureDetector.setIsLongpressEnabled(false);??
  152. ??
  153. ????????//?i?DON'T?really?know?why?i?need?this...??
  154. ????????setBaselineAligned(false);??
  155. ????}??
  156. ??
  157. ????/**?
  158. ?????*?Sets?the?listener?that?receives?a?notification?when?the?panel?becomes?
  159. ?????*?open/close.?
  160. ?????*??
  161. [email protected]?
  162. ?????*????????????The?listener?to?be?notified?when?the?panel?is?opened/closed.?
  163. ?????*/??
  164. ????public?void?setOnPanelListener(OnPanelListener?onPanelListener)??
  165. ????{??
  166. ????????panelListener?=?onPanelListener;??
  167. ????}??
  168. ??
  169. ????/**?
  170. ?????*?Gets?Panel's?mHandle?
  171. ?????*??
  172. [email protected]'s?mHandle?
  173. ?????*/??
  174. ????public?View?getHandle()??
  175. ????{??
  176. ????????return?mHandle;??
  177. ????}??
  178. ??
  179. ????/**?
  180. ?????*?Gets?Panel's?mContent?
  181. ?????*??
  182. [email protected]'s?mContent?
  183. ?????*/??
  184. ????public?View?getContent()??
  185. ????{??
  186. ????????return?mContent;??
  187. ????}??
  188. ??
  189. ????/**?
  190. ?????*?Sets?the?acceleration?curve?for?panel's?animation.?
  191. ?????*??
  192. [email protected]?
  193. ?????*????????????The?interpolator?which?defines?the?acceleration?curve?
  194. ?????*/??
  195. ????public?void?setInterpolator(Interpolator?i)??
  196. ????{??
  197. ????????mInterpolator?=?i;??
  198. ????}??
  199. ??
  200. ????/**?
  201. ?????*?Set?the?opened?state?of?Panel.?
  202. ?????*??
  203. [email protected]?
  204. ?????*????????????True?if?Panel?is?to?be?opened,?false?if?Panel?is?to?be?closed.?
  205. [email protected]?
  206. ?????*????????????True?if?use?animation,?false?otherwise.?
  207. ?????*??
  208. [email protected],?false?otherwise.?
  209. ?????*??
  210. ?????*/??
  211. ????public?boolean?setOpen(boolean?open,?boolean?animate)??
  212. ????{??
  213. ????????if?(mState?==?State.READY?&&?isOpen()?^?open)??
  214. ????????{??
  215. ????????????mIsShrinking?=?!open;??
  216. ????????????if?(animate)??
  217. ????????????{??
  218. ????????????????mState?=?State.ABOUT_TO_ANIMATE;??
  219. ????????????????if?(!mIsShrinking)??
  220. ????????????????{??
  221. ????????????????????//?this?could?make?flicker?so?we?test?mState?in??
  222. ????????????????????//?dispatchDraw()??
  223. ????????????????????//?to?see?if?is?equal?to?ABOUT_TO_ANIMATE??
  224. ????????????????????mContent.setVisibility(VISIBLE);??
  225. ????????????????}??
  226. ????????????????long?now?=?SystemClock.uptimeMillis();??
  227. ????????????????mAnimationLastTime?=?now;??
  228. ????????????????mCurrentAnimationTime?=?now?+?ANIMATION_FRAME_DURATION;??
  229. ????????????????mAnimating?=?true;??
  230. ????????????????mHandler.removeMessages(MSG_ANIMATE);??
  231. ????????????????mHandler.removeMessages(MSG_PREPARE_ANIMATE);??
  232. ????????????????mHandler.sendMessageAtTime(??
  233. ????????????????????????mHandler.obtainMessage(MSG_PREPARE_ANIMATE),??
  234. ????????????????????????mCurrentAnimationTime);??
  235. ????????????}??
  236. ????????????else??
  237. ????????????{??
  238. ????????????????mContent.setVisibility(open???VISIBLE?:?GONE);??
  239. ????????????????postProcess();??
  240. ????????????}??
  241. ????????????return?true;??
  242. ????????}??
  243. ????????return?false;??
  244. ????}??
  245. ??
  246. ????/**?
  247. ?????*?Returns?the?opened?status?for?Panel.?
  248. ?????*??
  249. [email protected],?false?otherwise.?
  250. ?????*/??
  251. ????public?boolean?isOpen()??
  252. ????{??
  253. ????????return?mContent.getVisibility()?==?VISIBLE;??
  254. ????}??
  255. ??
  256. ????@Override??
  257. ????protected?void?onFinishInflate()??
  258. ????{??
  259. ????????super.onFinishInflate();??
  260. ????????mHandle?=?findViewById(mHandleId);??
  261. ????????if?(mHandle?==?null)??
  262. ????????{??
  263. ????????????String?name?=?getResources().getResourceEntryName(mHandleId);??
  264. ????????????throw?new?RuntimeException(??
  265. ????????????????????"Your?Panel?must?have?a?child?View?whose?id?attribute?is?'R.id."??
  266. ????????????????????????????+?name?+?"'");??
  267. ????????}??
  268. ????????mHandle.setClickable(true);??
  269. ????????mHandle.setOnTouchListener(touchListener);??
  270. ????????//?mHandle.setOnClickListener(clickListener);??
  271. ??
  272. ????????mContent?=?findViewById(mContentId);??
  273. ????????if?(mContent?==?null)??
  274. ????????{??
  275. ????????????String?name?=?getResources().getResourceEntryName(mHandleId);??
  276. ????????????throw?new?RuntimeException(??
  277. ????????????????????"Your?Panel?must?have?a?child?View?whose?id?attribute?is?'R.id."??
  278. ????????????????????????????+?name?+?"'");??
  279. ????????}??
  280. ??
  281. ????????//?reposition?children??
  282. ????????removeView(mHandle);??
  283. ????????removeView(mContent);??
  284. ????????if?(mPosition?==?TOP?||?mPosition?==?LEFT)??
  285. ????????{??
  286. ????????????addView(mContent);??
  287. ????????????addView(mHandle);??
  288. ????????}??
  289. ????????else??
  290. ????????{??
  291. ????????????addView(mHandle);??
  292. ????????????addView(mContent);??
  293. ????????}??
  294. ??
  295. ????????if?(mClosedHandle?!=?null)??
  296. ????????{??
  297. ????????????mHandle.setBackgroundDrawable(mClosedHandle);??
  298. ????????}??
  299. ????????mContent.setClickable(true);??
  300. ????????mContent.setVisibility(GONE);??
  301. ????????if?(mWeight?>?0)??
  302. ????????{??
  303. ????????????ViewGroup.LayoutParams?params?=?mContent.getLayoutParams();??
  304. ????????????if?(mOrientation?==?VERTICAL)??
  305. ????????????{??
  306. ????????????????params.height?=?ViewGroup.LayoutParams.FILL_PARENT;??
  307. ????????????}??
  308. ????????????else??
  309. ????????????{??
  310. ????????????????params.width?=?ViewGroup.LayoutParams.FILL_PARENT;??
  311. ????????????}??
  312. ????????????mContent.setLayoutParams(params);??
  313. ????????}??
  314. ????}??
  315. ??
  316. ????@Override??
  317. ????protected?void?onAttachedToWindow()??
  318. ????{??
  319. ????????super.onAttachedToWindow();??
  320. ????????ViewParent?parent?=?getParent();??
  321. ????????if?(parent?!=?null?&&?parent?instanceof?FrameLayout)??
  322. ????????{??
  323. ????????????mBringToFront?=?true;??
  324. ????????}??
  325. ????}??
  326. ??
  327. ????@Override??
  328. ????protected?void?onMeasure(int?widthMeasureSpec,?int?heightMeasureSpec)??
  329. ????{??
  330. ????????if?(mWeight?>?0?&&?mContent.getVisibility()?==?VISIBLE)??
  331. ????????{??
  332. ????????????View?parent?=?(View)?getParent();??
  333. ????????????if?(parent?!=?null)??
  334. ????????????{??
  335. ????????????????if?(mOrientation?==?VERTICAL)??
  336. ????????????????{??
  337. ????????????????????heightMeasureSpec?=?MeasureSpec.makeMeasureSpec(??
  338. ????????????????????????????(int)?(parent.getHeight()?*?mWeight),??
  339. ????????????????????????????MeasureSpec.EXACTLY);??
  340. ????????????????}??
  341. ????????????????else??
  342. ????????????????{??
  343. ????????????????????widthMeasureSpec?=?MeasureSpec.makeMeasureSpec(??
  344. ????????????????????????????(int)?(parent.getWidth()?*?mWeight),??
  345. ????????????????????????????MeasureSpec.EXACTLY);??
  346. ????????????????}??
  347. ????????????}??
  348. ????????}??
  349. ????????super.onMeasure(widthMeasureSpec,?heightMeasureSpec);??
  350. ????}??
  351. ??
  352. ????@Override??
  353. ????protected?void?onLayout(boolean?changed,?int?l,?int?t,?int?r,?int?b)??
  354. ????{??
  355. ????????super.onLayout(changed,?l,?t,?r,?b);??
  356. ????????mContentWidth?=?mContent.getWidth();??
  357. ????????mContentHeight?=?mContent.getHeight();??
  358. ????}??
  359. ??
  360. ????@Override??
  361. ????protected?void?dispatchDraw(Canvas?canvas)??
  362. ????{??
  363. ????????//?String?name?=?getResources().getResourceEntryName(getId());??
  364. ????????//?Log.d(TAG,?name?+?"?ispatchDraw?"?+?mState);??
  365. ????????//?this?is?why?'mState'?was?added:??
  366. ????????//?avoid?flicker?before?animation?start??
  367. ????????if?(mState?==?State.ABOUT_TO_ANIMATE?&&?!mIsShrinking)??
  368. ????????{??
  369. ????????????int?delta?=?mOrientation?==?VERTICAL???mContentHeight??
  370. ????????????????????:?mContentWidth;??
  371. ????????????if?(mPosition?==?LEFT?||?mPosition?==?TOP)??
  372. ????????????{??
  373. ????????????????delta?=?-delta;??
  374. ????????????}??
  375. ????????????if?(mOrientation?==?VERTICAL)??
  376. ????????????{??
  377. ????????????????canvas.translate(0,?delta);??
  378. ????????????}??
  379. ????????????else??
  380. ????????????{??
  381. ????????????????canvas.translate(delta,?0);??
  382. ????????????}??
  383. ????????}??
  384. ????????if?(mState?==?State.TRACKING?||?mState?==?State.FLYING??
  385. ????????????????||?mState?==?State.CLICK)??
  386. ????????{??
  387. ????????????canvas.translate(mTrackX,?mTrackY);??
  388. ????????}??
  389. ????????super.dispatchDraw(canvas);??
  390. ????}??
  391. ??
  392. ????private?float?ensureRange(float?v,?int?min,?int?max)??
  393. ????{??
  394. ????????v?=?Math.max(v,?min);??
  395. ????????v?=?Math.min(v,?max);??
  396. ????????return?v;??
  397. ????}??
  398. ??
  399. ????OnTouchListener?touchListener?=?new?OnTouchListener()??
  400. ????{??
  401. ??????????
  402. ????????public?boolean?onTouch(View?v,?MotionEvent?event)??
  403. ????????{??
  404. ??
  405. ????????????if?(mAnimating)??
  406. ????????????{??
  407. ????????????????//?we?are?animating??
  408. ????????????????return?true;//?动画中不响应onTouch事件??
  409. ????????????}??
  410. ??
  411. ????????????int?action?=?event.getAction();??
  412. ????????????if?(action?==?MotionEvent.ACTION_DOWN)??
  413. ????????????{??
  414. ????????????????if?(mBringToFront)??
  415. ????????????????{??
  416. ????????????????????bringToFront();??
  417. ????????????????}??
  418. ????????????}??
  419. ??
  420. ????????????if?(!mGestureDetector.onTouchEvent(event))??
  421. ????????????{??
  422. ????????????????if?(action?==?MotionEvent.ACTION_UP)??
  423. ????????????????{??
  424. ????????????????????//?tup?up?after?scrolling??
  425. ??
  426. ????????????????????long?now?=?SystemClock.uptimeMillis();??
  427. ????????????????????mAnimationLastTime?=?now;??
  428. ????????????????????mCurrentAnimationTime?=?now?+?ANIMATION_FRAME_DURATION;??
  429. ????????????????????mAnimating?=?true;??
  430. ????????????????????mHandler.removeMessages(MSG_ANIMATE);??
  431. ????????????????????mHandler.removeMessages(MSG_PREPARE_ANIMATE);??
  432. ????????????????????mHandler.sendMessageAtTime(??
  433. ????????????????????????????mHandler.obtainMessage(MSG_PREPARE_ANIMATE),??
  434. ????????????????????????????mCurrentAnimationTime);??
  435. ????????????????}??
  436. ????????????}??
  437. ????????????return?false;??
  438. ????????}??
  439. ????};??
  440. ??
  441. ????public?boolean?initChange()??
  442. ????{??
  443. ????????if?(mState?!=?State.READY)??
  444. ????????{??
  445. ????????????//?we?are?animating?or?just?about?to?animate??
  446. ????????????return?false;??
  447. ????????}??
  448. ????????mState?=?State.ABOUT_TO_ANIMATE;??
  449. ????????mIsShrinking?=?mContent.getVisibility()?==?VISIBLE;??
  450. ????????if?(!mIsShrinking)??
  451. ????????{??
  452. ????????????//?this?could?make?flicker?so?we?test?mState?in?dispatchDraw()??
  453. ????????????//?to?see?if?is?equal?to?ABOUT_TO_ANIMATE??
  454. ????????????mContent.setVisibility(VISIBLE);??
  455. ????????}??
  456. ????????return?true;??
  457. ????}??
  458. ??
  459. ????private?void?postProcess()??
  460. ????{??
  461. ????????if?(mIsShrinking?&&?mClosedHandle?!=?null)??
  462. ????????{??
  463. ????????????mHandle.setBackgroundDrawable(mClosedHandle);??
  464. ????????}??
  465. ????????else?if?(!mIsShrinking?&&?mOpenedHandle?!=?null)??
  466. ????????{??
  467. ????????????mHandle.setBackgroundDrawable(mOpenedHandle);??
  468. ????????}??
  469. ????????//?invoke?listener?if?any??
  470. ????????if?(panelListener?!=?null)??
  471. ????????{??
  472. ????????????if?(mIsShrinking)??
  473. ????????????{??
  474. ????????????????panelListener.onPanelClosed(Panel.this);??
  475. ????????????}??
  476. ????????????else??
  477. ????????????{??
  478. ????????????????panelListener.onPanelOpened(Panel.this);??
  479. ????????????}??
  480. ????????}??
  481. ????}??
  482. ??
  483. ????class?PanelOnGestureListener?implements?OnGestureListener??
  484. ????{??
  485. ????????float?scrollY;??
  486. ????????float?scrollX;??
  487. ??
  488. ????????@Override??
  489. ????????public?boolean?onDown(MotionEvent?e)??
  490. ????????{??
  491. ????????????scrollX?=?scrollY?=?0;??
  492. ????????????lastRawX?=?curRawX?=?lastRawY?=?curRawY?=?-1;??
  493. ????????????lastEventTime?=?curEventTime?=?-1;??
  494. ????????????initChange();??
  495. ????????????return?true;??
  496. ????????}??
  497. ??
  498. ????????@Override??
  499. ????????public?boolean?onFling(MotionEvent?e1,?MotionEvent?e2,?float?velocityX,??
  500. ????????????????float?velocityY)??
  501. ????????{??
  502. ????????????mState?=?State.FLYING;??
  503. ??
  504. ????????????float?velocityX2,?velocityY2;??
  505. ????????????if?(lastRawX?==?-1?&&?lastRawY?==?-1)???//见onScroll方法??
  506. ????????????{??
  507. ????????????????velocityX2?=?(curRawX?-?e1.getRawX())??
  508. ????????????????????????/?(curEventTime?-?e1.getEventTime())?*?1000;?//??px/s??
  509. ????????????????velocityY2?=?(curRawY?-?e1.getRawY())??
  510. ????????????????????????/?(curEventTime?-?e1.getEventTime())?*?1000;??
  511. ????????????}??
  512. ????????????else??
  513. ????????????{??
  514. ????????????????velocityX2?=?(curRawX?-?lastRawX)??
  515. ????????????????????????/?(curEventTime?-?lastEventTime)?*?1000;??
  516. ????????????????velocityY2?=?(curRawY?-?lastRawY)??
  517. ????????????????????????/?(curEventTime?-?lastEventTime)?*?1000;??
  518. ????????????}??
  519. ??
  520. ????????????mVelocity?=?mOrientation?==?VERTICAL???velocityY2?:?velocityX2;??
  521. ??
  522. ????????????if?(Math.abs(mVelocity)?>?50)??
  523. ????????????{??
  524. ????????????????if?(mVelocity?>?0)??
  525. ????????????????{??
  526. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  527. ????????????????}??
  528. ????????????????else??
  529. ????????????????{??
  530. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  531. ????????????????}??
  532. ??
  533. ????????????????long?now?=?SystemClock.uptimeMillis();??
  534. ????????????????mAnimationLastTime?=?now;??
  535. ????????????????mCurrentAnimationTime?=?now?+?ANIMATION_FRAME_DURATION;??
  536. ????????????????mAnimating?=?true;??
  537. ????????????????mHandler.removeMessages(MSG_ANIMATE);??
  538. ????????????????mHandler.removeMessages(MSG_PREPARE_ANIMATE);??
  539. ????????????????mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE),??
  540. ????????????????????????mCurrentAnimationTime);??
  541. ????????????????return?true;??
  542. ????????????}??
  543. ????????????return?false;??
  544. ????????}??
  545. ??
  546. ????????@Override??
  547. ????????public?void?onLongPress(MotionEvent?e)??
  548. ????????{??
  549. ????????????//?not?used??
  550. ????????}??
  551. ??
  552. ????????@Override??
  553. ????????public?boolean?onScroll(MotionEvent?e1,?MotionEvent?e2,??
  554. ????????????????float?distanceX,?float?distanceY)??
  555. ????????{??
  556. ????????????mState?=?State.TRACKING;??
  557. ????????????float?tmpY?=?0,?tmpX?=?0;??
  558. ????????????if?(mOrientation?==?VERTICAL)??
  559. ????????????{??
  560. ????????????????scrollY?-=?distanceY;??
  561. ????????????????if?(mPosition?==?TOP)??
  562. ????????????????{??
  563. ????????????????????tmpY?=?ensureRange(scrollY,?-mContentHeight,?0);??
  564. ????????????????}??
  565. ????????????????else??
  566. ????????????????{??
  567. ????????????????????tmpY?=?ensureRange(scrollY,?0,?mContentHeight);??
  568. ????????????????}??
  569. ????????????}??
  570. ????????????else??
  571. ????????????{??
  572. ????????????????scrollX?-=?distanceX;??
  573. ????????????????if?(mPosition?==?LEFT)??
  574. ????????????????{??
  575. ????????????????????tmpX?=?ensureRange(scrollX,?-mContentWidth,?0);??
  576. ????????????????}??
  577. ????????????????else??
  578. ????????????????{??
  579. ????????????????????tmpX?=?ensureRange(scrollX,?0,?mContentWidth);??
  580. ????????????????}??
  581. ????????????}??
  582. ??
  583. ????????????if?(tmpX?!=?mTrackX?||?tmpY?!=?mTrackY)??
  584. ????????????{??
  585. ????????????????mTrackX?=?tmpX;??
  586. ????????????????mTrackY?=?tmpY;??
  587. ????????????????//?invalidate();?//放在此导致极快速滑动至touch区域外界面不刷新（mTrackX、mTrackY均为0）??
  588. ????????????}??
  589. ????????????invalidate();??
  590. ??
  591. ????????????lastRawX?=?curRawX;??
  592. ????????????lastRawY?=?curRawY;??
  593. ????????????lastEventTime?=?curEventTime;??
  594. ????????????curRawX?=?e2.getRawX();??
  595. ????????????curRawY?=?e2.getRawY();??
  596. ????????????curEventTime?=?e2.getEventTime();??
  597. ????????????return?true;??
  598. ????????}??
  599. ??
  600. ????????@Override??
  601. ????????public?void?onShowPress(MotionEvent?e)??
  602. ????????{??
  603. ????????????//?not?used??
  604. ????????}??
  605. ??
  606. ????????@Override??
  607. ????????public?boolean?onSingleTapUp(MotionEvent?e)??
  608. ????????{??
  609. ????????????//?not?used??
  610. ????????????return?false;??
  611. ????????}??
  612. ????}??
  613. ??
  614. ????private?void?prepareAnimation()??
  615. ????{??
  616. ??
  617. ????????switch?(mPosition)??
  618. ????????{??
  619. ????????????case?LEFT:??
  620. ????????????????if?(mIsShrinking)??
  621. ????????????????{??
  622. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  623. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  624. ??
  625. ????????????????}??
  626. ????????????????else??
  627. ????????????????{??
  628. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  629. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  630. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  631. ????????????????????{??
  632. ????????????????????????mTrackX?=?-mContentWidth;??
  633. ????????????????????}??
  634. ????????????????}??
  635. ????????????????break;??
  636. ????????????case?RIGHT:??
  637. ????????????????if?(mIsShrinking)??
  638. ????????????????{??
  639. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  640. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  641. ????????????????}??
  642. ????????????????else??
  643. ????????????????{??
  644. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  645. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  646. ??
  647. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  648. ????????????????????{??
  649. ????????????????????????mTrackX?=?mContentWidth;??
  650. ????????????????????}??
  651. ????????????????}??
  652. ????????????????break;??
  653. ????????????case?TOP:??
  654. ????????????????if?(mIsShrinking)??
  655. ????????????????{??
  656. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  657. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  658. ????????????????}??
  659. ????????????????else??
  660. ????????????????{??
  661. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  662. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  663. ??
  664. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  665. ????????????????????{??
  666. ????????????????????????mTrackY?=?-mContentHeight;??
  667. ????????????????????}??
  668. ????????????????}??
  669. ????????????????break;??
  670. ????????????case?BOTTOM:??
  671. ????????????????if?(mIsShrinking)??
  672. ????????????????{??
  673. ????????????????????mVelocity?=?mMaximumMajorVelocity;??
  674. ????????????????????mAnimatedAcceleration?=?mMaximumAcceleration;??
  675. ????????????????}??
  676. ????????????????else??
  677. ????????????????{??
  678. ????????????????????mVelocity?=?-mMaximumMajorVelocity;??
  679. ????????????????????mAnimatedAcceleration?=?-mMaximumAcceleration;??
  680. ??
  681. ????????????????????if?(mTrackX?==?0?&&?mState?==?State.ABOUT_TO_ANIMATE)??
  682. ????????????????????{??
  683. ????????????????????????mTrackY?=?mContentHeight;??
  684. ????????????????????}??
  685. ????????????????}??
  686. ????????????????break;??
  687. ????????}??
  688. ??
  689. ????????if?(mState?==?State.TRACKING)??
  690. ????????{??
  691. ????????????if?(mIsShrinking)??
  692. ????????????{??
  693. ????????????????if?((mOrientation?==?VERTICAL?&&?Math.abs(mTrackY)?<?mContentHeight?/?2)??
  694. ????????????????????????||?(mOrientation?==?HORIZONTAL?&&?Math.abs(mTrackX)?<?mContentWidth?/?2))??
  695. ????????????????{??
  696. ????????????????????mVelocity?=?-mVelocity;??
  697. ????????????????????mAnimatedAcceleration?=?-mAnimatedAcceleration;??
  698. ????????????????????mIsShrinking?=?!mIsShrinking;??
  699. ????????????????}??
  700. ????????????}??
  701. ????????????else??
  702. ????????????{??
  703. ????????????????if?((mOrientation?==?VERTICAL?&&?Math.abs(mTrackY)?>?mContentHeight?/?2)??
  704. ????????????????????????||?(mOrientation?==?HORIZONTAL?&&?Math.abs(mTrackX)?>?mContentWidth?/?2))??
  705. ????????????????{??
  706. ????????????????????mVelocity?=?-mVelocity;??
  707. ????????????????????mAnimatedAcceleration?=?-mAnimatedAcceleration;??
  708. ????????????????????mIsShrinking?=?!mIsShrinking;??
  709. ????????????????}??
  710. ????????????}??
  711. ????????}??
  712. ????????if?(mState?!=?State.FLYING?&&?mState?!=?State.TRACKING)??
  713. ????????{??
  714. ????????????mState?=?State.CLICK;??
  715. ????????}??
  716. ????}??
  717. ??
  718. ????private?void?doAnimation()??
  719. ????{??
  720. ??
  721. ????????if?(mAnimating)??
  722. ????????{??
  723. ????????????long?now?=?SystemClock.uptimeMillis();??
  724. ????????????float?t?=?(now?-?mAnimationLastTime)?/?1000.0f;?????//?ms?->?s??
  725. ????????????final?float?v?=?mVelocity;??????????????????????????//?px/s??
  726. ????????????final?float?a?=?mAnimatedAcceleration;??????????????//?px/s/s??
  727. ????????????mVelocity?=?v?+?(a?*?t);????????????????????????????//?px/s??
  728. ????????????mAnimationLastTime?=?now;??
  729. ??
  730. ????????????switch?(mPosition)??
  731. ????????????{??
  732. ????????????????case?LEFT:??
  733. ????????????????????mTrackX?=?mTrackX?+?(v?*?t)?+?(0.5f?*?a?*?t?*?t);?//?px??
  734. ????????????????????if?(mTrackX?>?0)??
  735. ????????????????????{??
  736. ????????????????????????mTrackX?=?0;??
  737. ????????????????????????mState?=?State.READY;??
  738. ????????????????????????mAnimating?=?false;??
  739. ????????????????????}??
  740. ????????????????????else?if?(mTrackX?<?-mContentWidth)??
  741. ????????????????????{??
  742. ????????????????????????mTrackX?=?-mContentWidth;??
  743. ????????????????????????mContent.setVisibility(GONE);??
  744. ????????????????????????mState?=?State.READY;??
  745. ????????????????????????mAnimating?=?false;??
  746. ????????????????????}??
  747. ????????????????????break;??
  748. ????????????????case?RIGHT:??
  749. ????????????????????mTrackX?=?mTrackX?+?(v?*?t)?+?(0.5f?*?a?*?t?*?t);??
  750. ????????????????????if?(mTrackX?<?0)??
  751. ????????????????????{??
  752. ????????????????????????mTrackX?=?0;??
  753. ????????????????????????mState?=?State.READY;??
  754. ????????????????????????mAnimating?=?false;??
  755. ????????????????????}??
  756. ????????????????????else?if?(mTrackX?>?mContentWidth)??
  757. ????????????????????{??
  758. ????????????????????????mTrackX?=?mContentWidth;??
  759. ????????????????????????mContent.setVisibility(GONE);??
  760. ????????????????????????mState?=?State.READY;??
  761. ????????????????????????mAnimating?=?false;??
  762. ????????????????????}??
  763. ????????????????????break;??
  764. ????????????????case?TOP:??
  765. ????????????????????mTrackY?=?mTrackY?+?(v?*?t)?+?(0.5f?*?a?*?t?*?t);??
  766. ????????????????????if?(mTrackY?>?0)??
  767. ????????????????????{??
  768. ????????????????????????mTrackY?=?0;??
  769. ????????????????????????mState?=?State.READY;??
  770. ????????????????????????mAnimating?=?false;??
  771. ????????????????????}??
  772. ????????????????????else?if?(mTrackY?<?-mContentHeight)??
  773. ????????????????????{??
  774. ????????????????????????mTrackY?=?-mContentHeight;??
  775. ????????????????????????mContent.setVisibility(GONE);??
  776. ????????????????????????mState?=?State.READY;??
  777. ????????????????????????mAnimating?=?false;??
  778. ????????????????????}??
  779. ????????????????????break;??
  780. ????????????????case?BOTTOM:??
  781. ????????????????????mTrackY?=?mTrackY?+?(v?*?t)?+?(0.5f?*?a?*?t?*?t);??
  782. ????????????????????if?(mTrackY?<?0)??
  783. ????????????????????{??
  784. ????????????????????????mTrackY?=?0;??
  785. ????????????????????????mState?=?State.READY;??
  786. ????????????????????????mAnimating?=?false;??
  787. ????????????????????}??
  788. ????????????????????else?if?(mTrackY?>?mContentHeight)??
  789. ????????????????????{??
  790. ????????????????????????mTrackY?=?mContentHeight;??
  791. ????????????????????????mContent.setVisibility(GONE);??
  792. ????????????????????????mState?=?State.READY;??
  793. ????????????????????????mAnimating?=?false;??
  794. ????????????????????}??
  795. ????????????????????break;??
  796. ????????????}??
  797. ????????????invalidate();??
  798. ??
  799. ????????????if?(!mAnimating)??
  800. ????????????{??
  801. ????????????????postProcess();??
  802. ????????????????return;??
  803. ????????????}??
  804. ????????????mCurrentAnimationTime?+=?ANIMATION_FRAME_DURATION;??
  805. ????????????mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE),??
  806. ????????????????????mCurrentAnimationTime);??
  807. ??
  808. ????????}??
  809. ????}??
  810. ??
  811. ????private?class?SlidingHandler?extends?Handler??
  812. ????{??
  813. ????????public?void?handleMessage(Message?m)??
  814. ????????{??
  815. ????????????switch?(m.what)??
  816. ????????????{??
  817. ????????????????case?MSG_ANIMATE:??
  818. ????????????????????doAnimation();??
  819. ????????????????????break;??
  820. ????????????????case?MSG_PREPARE_ANIMATE:??
  821. ????????????????????prepareAnimation();??
  822. ????????????????????doAnimation();??
  823. ????????????????????break;??
  824. ????????????}??
  825. ????????}??
  826. ????}??
  827. }??


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