Android 带动画的SwipedSmissBehavior问题
我的问题是，为什么在拖动Android 带动画的SwipedSmissBehavior问题,android,android-layout,android-coordinatorlayout,Android,Android Layout,Android Coordinatorlayout,我的问题是，为什么在拖动cardwiew时，我看不到任何动画。在许多示例中，动画都存在。也许有人知道为什么我从右向左滑动时会看到从左向右的动画 布局： <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-a
cardwiew<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/swipe.card"
android:layout_width="match_parent"
android:layout_height="200dp"
card_view:cardCornerRadius="4dp"
card_view:contentPadding="8dp"
android:layout_margin="16dp"
app:layout_anchorGravity="bottom">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Card"
android:lineSpacingExtra="6dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="SWIPE THIS CARD"
android:layout_gravity="bottom|right"
android:textAllCaps="true"
android:fontFamily="sans-serif-medium"/>
</android.support.v7.widget.CardView>
</android.support.design.widget.CoordinatorLayout>
尝试将此行添加到cardView：
cardView.setOnTouchListener { v, event ->
if (v != null && v is CardView) {
b.onInterceptTouchEvent(coordinatorLayout, v, event)
} else {
false
}
}
然后我检查Snackbar是如何实现的，但它们是一样的。新的snackbar只对快速滑动做出响应。我记得我们以前可以玩snackbar，但现在不行了。我想这是出于一些新材料设计的考虑。我认为支持库有问题，所以我复制了代码并对其进行了一些修改。下面是一个工作示例： 将新行为应用于
snackbarsnackbar.addCallback(new Snackbar.Callback() {
@Override
public void onShown(Snackbar sb) {
super.onShown(sb);
ViewGroup.LayoutParams params = sb.getView().getLayoutParams();
if (params instanceof CoordinatorLayout.LayoutParams) {
SwipeDismissBehavior2<View> behavior = new SwipeDismissBehavior2<>();
behavior.setSwipeDirection(SwipeDismissBehavior2.SWIPE_DIRECTION_ANY);
((CoordinatorLayout.LayoutParams) params).setBehavior(behavior);
}
}
});
snackbar.addCallback（新的snackbar.Callback（）{
@凌驾
公开募捐（Snackbar sb）{
super.onShown（某人）；
ViewGroup.LayoutParams params=sb.getView（）.getLayoutParams（）；
if（参数CoordinatorLayout.LayoutParams的实例）{
SwipedSmissBehavior2行为=新的SwipedSmissBehavior2（）；
behavior.setswitdirection（SwipedSmissBehavior2.SWIPE\u DIRECTION\u ANY）；
（（CoordinatorLayout.LayoutParams）params）setBehavior（行为）；
}
}
});
public class SwipeDismissBehavior2<V extends View> extends Behavior<V> {
/**
* A view is not currently being dragged or animating as a result of a fling/snap.
*/
public static final int STATE_IDLE = ViewDragHelper.STATE_IDLE;
/**
* A view is currently being dragged. The position is currently changing as a result
* of user input or simulated user input.
*/
public static final int STATE_DRAGGING = ViewDragHelper.STATE_DRAGGING;
/**
* A view is currently settling into place as a result of a fling or
* predefined non-interactive motion.
*/
public static final int STATE_SETTLING = ViewDragHelper.STATE_SETTLING;
/** @hide */
@IntDef({SWIPE_DIRECTION_START_TO_END, SWIPE_DIRECTION_END_TO_START, SWIPE_DIRECTION_ANY})
@Retention(RetentionPolicy.SOURCE)
private @interface SwipeDirection {}
/**
* Swipe direction that only allows swiping in the direction of start-to-end. That is
* left-to-right in LTR, or right-to-left in RTL.
*/
public static final int SWIPE_DIRECTION_START_TO_END = 0;
/**
* Swipe direction that only allows swiping in the direction of end-to-start. That is
* right-to-left in LTR or left-to-right in RTL.
*/
public static final int SWIPE_DIRECTION_END_TO_START = 1;
/**
* Swipe direction which allows swiping in either direction.
*/
public static final int SWIPE_DIRECTION_ANY = 2;
private static final float DEFAULT_DRAG_DISMISS_THRESHOLD = 0.5f;
private static final float DEFAULT_ALPHA_START_DISTANCE = 0f;
private static final float DEFAULT_ALPHA_END_DISTANCE = DEFAULT_DRAG_DISMISS_THRESHOLD;
private ViewDragHelper mViewDragHelper;
private OnDismissListener mListener;
private boolean mIgnoreEvents;
private float mSensitivity = 0f;
private boolean mSensitivitySet;
private int mSwipeDirection = SWIPE_DIRECTION_ANY;
private float mDragDismissThreshold = DEFAULT_DRAG_DISMISS_THRESHOLD;
private float mAlphaStartSwipeDistance = DEFAULT_ALPHA_START_DISTANCE;
private float mAlphaEndSwipeDistance = DEFAULT_ALPHA_END_DISTANCE;
/**
* Callback interface used to notify the application that the view has been dismissed.
*/
public interface OnDismissListener {
/**
* Called when {@code view} has been dismissed via swiping.
*/
public void onDismiss(View view);
/**
* Called when the drag state has changed.
*
* @param state the new state. One of
* {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
*/
public void onDragStateChanged(int state);
}
/**
* Set the listener to be used when a dismiss event occurs.
*
* @param listener the listener to use.
*/
public void setListener(OnDismissListener listener) {
mListener = listener;
}
/**
* Sets the swipe direction for this behavior.
*
* @param direction one of the {@link #SWIPE_DIRECTION_START_TO_END},
* {@link #SWIPE_DIRECTION_END_TO_START} or {@link #SWIPE_DIRECTION_ANY}
*/
public void setSwipeDirection(@SwipeDirection int direction) {
mSwipeDirection = direction;
}
/**
* Set the threshold for telling if a view has been dragged enough to be dismissed.
*
* @param distance a ratio of a view's width, values are clamped to 0 >= x <= 1f;
*/
public void setDragDismissDistance(float distance) {
mDragDismissThreshold = clamp(0f, distance, 1f);
}
/**
* The minimum swipe distance before the view's alpha is modified.
*
* @param fraction the distance as a fraction of the view's width.
*/
public void setStartAlphaSwipeDistance(float fraction) {
mAlphaStartSwipeDistance = clamp(0f, fraction, 1f);
}
/**
* The maximum swipe distance for the view's alpha is modified.
*
* @param fraction the distance as a fraction of the view's width.
*/
public void setEndAlphaSwipeDistance(float fraction) {
mAlphaEndSwipeDistance = clamp(0f, fraction, 1f);
}
/**
* Set the sensitivity used for detecting the start of a swipe. This only takes effect if
* no touch handling has occured yet.
*
* @param sensitivity Multiplier for how sensitive we should be about detecting
* the start of a drag. Larger values are more sensitive. 1.0f is normal.
*/
public void setSensitivity(float sensitivity) {
mSensitivity = sensitivity;
mSensitivitySet = true;
}
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
switch (MotionEventCompat.getActionMasked(event)) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
// Reset the ignore flag
if (mIgnoreEvents) {
mIgnoreEvents = false;
return false;
}
break;
default:
mIgnoreEvents = !parent.isPointInChildBounds(child,
(int) event.getX(), (int) event.getY());
break;
}
if (mIgnoreEvents) {
return false;
}
ensureViewDragHelper(parent);
return mViewDragHelper.shouldInterceptTouchEvent(event);
}
@Override
public boolean onTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
if (mViewDragHelper != null) {
mViewDragHelper.processTouchEvent(event);
return true;
}
return false;
}
private final ViewDragHelper.Callback mDragCallback = new ViewDragHelper.Callback() {
private int mOriginalCapturedViewLeft;
@Override
public boolean tryCaptureView(View child, int pointerId) {
mOriginalCapturedViewLeft = child.getLeft();
return true;
}
@Override
public void onViewDragStateChanged(int state) {
if (mListener != null) {
mListener.onDragStateChanged(state);
}
}
@Override
public void onViewReleased(View child, float xvel, float yvel) {
final int childWidth = child.getWidth();
int targetLeft;
boolean dismiss = false;
if (shouldDismiss(child, xvel)) {
targetLeft = child.getLeft() < mOriginalCapturedViewLeft
? mOriginalCapturedViewLeft - childWidth
: mOriginalCapturedViewLeft + childWidth;
dismiss = true;
} else {
// Else, reset back to the original left
targetLeft = mOriginalCapturedViewLeft;
}
if (mViewDragHelper.settleCapturedViewAt(targetLeft, child.getTop())) {
ViewCompat.postOnAnimation(child, new SettleRunnable(child, dismiss));
} else if (dismiss) {
child.setVisibility(View.GONE);
if (mListener != null) {
mListener.onDismiss(child);
}
}
}
private boolean shouldDismiss(View child, float xvel) {
if (xvel != 0f) {
final boolean isRtl = ViewCompat.getLayoutDirection(child)
== ViewCompat.LAYOUT_DIRECTION_RTL;
if (mSwipeDirection == SWIPE_DIRECTION_ANY) {
// We don't care about the direction so return true
return true;
} else if (mSwipeDirection == SWIPE_DIRECTION_START_TO_END) {
// We only allow start-to-end swiping, so the fling needs to be in the
// correct direction
return isRtl ? xvel < 0f : xvel > 0f;
} else if (mSwipeDirection == SWIPE_DIRECTION_END_TO_START) {
// We only allow end-to-start swiping, so the fling needs to be in the
// correct direction
return isRtl ? xvel > 0f : xvel < 0f;
}
} else {
final int distance = child.getLeft() - mOriginalCapturedViewLeft;
final int thresholdDistance = Math.round(child.getWidth() * mDragDismissThreshold);
return Math.abs(distance) >= thresholdDistance;
}
return false;
}
@Override
public int getViewHorizontalDragRange(View child) {
return child.getWidth();
}
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
final boolean isRtl = ViewCompat.getLayoutDirection(child)
== ViewCompat.LAYOUT_DIRECTION_RTL;
int min, max;
if (mSwipeDirection == SWIPE_DIRECTION_START_TO_END) {
if (isRtl) {
min = mOriginalCapturedViewLeft - child.getWidth();
max = mOriginalCapturedViewLeft;
} else {
min = mOriginalCapturedViewLeft;
max = mOriginalCapturedViewLeft + child.getWidth();
}
} else if (mSwipeDirection == SWIPE_DIRECTION_END_TO_START) {
if (isRtl) {
min = mOriginalCapturedViewLeft;
max = mOriginalCapturedViewLeft + child.getWidth();
} else {
min = mOriginalCapturedViewLeft - child.getWidth();
max = mOriginalCapturedViewLeft;
}
} else {
min = mOriginalCapturedViewLeft - child.getWidth();
max = mOriginalCapturedViewLeft + child.getWidth();
}
return clamp(min, left, max);
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
return child.getTop();
}
@Override
public void onViewPositionChanged(View child, int left, int top, int dx, int dy) {
final float distance = fraction(0, child.getWidth(), Math.abs(left - mOriginalCapturedViewLeft));
child.setAlpha(clamp(0f, 1f - distance, 1f));
}
};
private void ensureViewDragHelper(ViewGroup parent) {
if (mViewDragHelper == null) {
mViewDragHelper = mSensitivitySet
? ViewDragHelper.create(parent, mSensitivity, mDragCallback)
: ViewDragHelper.create(parent, mDragCallback);
}
}
private class SettleRunnable implements Runnable {
private final View mView;
private final boolean mDismiss;
SettleRunnable(View view, boolean dismiss) {
mView = view;
mDismiss = dismiss;
}
@Override
public void run() {
if (mViewDragHelper != null && mViewDragHelper.continueSettling(true)) {
ViewCompat.postOnAnimation(mView, this);
} else {
if (mDismiss) {
mView.setVisibility(View.GONE);
if (mListener != null) {
mListener.onDismiss(mView);
}
}
}
}
}
private static float clamp(float min, float value, float max) {
return Math.min(Math.max(min, value), max);
}
private static int clamp(int min, int value, int max) {
return Math.min(Math.max(min, value), max);
}
/**
* Retrieve the current drag state of this behavior. This will return one of
* {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
*
* @return The current drag state
*/
public int getDragState() {
return mViewDragHelper != null ? mViewDragHelper.getViewDragState() : STATE_IDLE;
}
/**
* The fraction that {@code value} is between {@code startValue} and {@code endValue}.
*/
static float fraction(float startValue, float endValue, float value) {
return (value - startValue) / (endValue - startValue);
}
}
公共类SwipedSmissBehavior2扩展了行为{
/**
*视图当前未被拖动或设置动画，这是投掷/捕捉的结果。
*/
public static final int STATE_IDLE=ViewDragHelper.STATE_IDLE；
/**
*当前正在拖动视图。因此，位置当前正在更改
*用户输入或模拟用户输入。
*/
public static final int STATE_DRAGGING=ViewDragHelper.STATE_DRAGGING；
/**
*一个视图当前由于一次抛投或
*预定义的非交互运动。
*/
公共静态最终int状态\u设置=ViewDragHelper.STATE\u设置；
/**@隐藏*/
@IntDef（{SWIPE_DIRECTION_START_TO_END，SWIPE_DIRECTION_END_TO_START，SWIPE_DIRECTION_ANY}）
@保留（RetentionPolicy.SOURCE）
私有@interface SwipeDirection{}
/**
*只允许从开始到结束方向滑动的滑动方向。即
*在LTR中从左向右，或在RTL中从右向左。
*/
公共静态最终整数滑动方向开始到结束=0；
/**
*只允许从结束到开始方向滑动的滑动方向。即
*在LTR中从右向左或在RTL中从左向右。
*/
公共静态最终整数滑动方向结束到开始=1；
/**
*滑动方向，允许在任一方向滑动。
*/
公共静态最终整数滑动方向任意=2；
私有静态最终浮动默认值\拖动\解除\阈值=0.5f；
专用静态最终浮动默认值\u ALPHA\u START\u距离=0f；
专用静态最终浮动默认值\u ALPHA\u END\u DISTANCE=默认值\u DRAG\u Disease\u THRESHOLD；
私有ViewDragHelper mViewDragHelper；
私家侦探；
私有布尔mIgnoreEvents；
专用浮点mSensitivity=0f；
私有布尔mSensitivitySet；
private int mSwipeDirection=swip\u DIRECTION\u ANY；
private float mdragdismisssthreshold=默认\u拖动\u解除\u阈值；
私有浮动MalphasStartSwipedInstance=默认的α开始距离；
私有浮动MalphaendSwipedInstance=默认的\u ALPHA\u END\u距离；
/**
*回调接口，用于通知应用程序视图已被取消。
*/
公共接口OnDismissListener{
/**
*通过刷卡解除{@code view}时调用。
*/
公共空间（视图）；
/**
*拖动状态更改时调用。
*
*@param state新状态。其中一个
*{@link#STATE_IDLE}、{@link#STATE_DRAGGING}或{@link#STATE_satting}。
*/
公共状态已更改（int状态）；
}
/**
*设置在发生解除事件时要使用的侦听器。
*
*@param listener要使用的侦听器。
*/
公共void setListener（OnDismissListener侦听器）{
mListener=监听器；
}
/**
*设置此行为的滑动方向。
*
*@param方向{@link#滑动方向(开始)到(结束)之一，
*{@link#滑动方向(u END)到(u START)或{@link#滑动方向(u ANY)
*/
公共方向（@SwipeDirection int direction）{
mSwipeDirection=方向；
}
/**
*设置阈值，以告知视图是否已被拖动到足以关闭的程度。
*
*@param distance视图宽度的比率，值被钳制为0>=x，那么是否确认此问题是由支持库版本引起的？我也在28.0.0上，面临着同样的问题：<使用自定义SwipedSmissBehavior似乎…太过了是的，我认为是，或者可能是一个新的实现。@DennisAnderson材质组件和roid他们有错误，他们仍然没有解决这个刷卡问题。但是你已经解决了。谢谢你！
snackbar.addCallback(new Snackbar.Callback() {
@Override
public void onShown(Snackbar sb) {
super.onShown(sb);
ViewGroup.LayoutParams params = sb.getView().getLayoutParams();
if (params instanceof CoordinatorLayout.LayoutParams) {
SwipeDismissBehavior2<View> behavior = new SwipeDismissBehavior2<>();
behavior.setSwipeDirection(SwipeDismissBehavior2.SWIPE_DIRECTION_ANY);
((CoordinatorLayout.LayoutParams) params).setBehavior(behavior);
}
}
});
public class SwipeDismissBehavior2<V extends View> extends Behavior<V> {
/**
* A view is not currently being dragged or animating as a result of a fling/snap.
*/
public static final int STATE_IDLE = ViewDragHelper.STATE_IDLE;
/**
* A view is currently being dragged. The position is currently changing as a result
* of user input or simulated user input.
*/
public static final int STATE_DRAGGING = ViewDragHelper.STATE_DRAGGING;
/**
* A view is currently settling into place as a result of a fling or
* predefined non-interactive motion.
*/
public static final int STATE_SETTLING = ViewDragHelper.STATE_SETTLING;
/** @hide */
@IntDef({SWIPE_DIRECTION_START_TO_END, SWIPE_DIRECTION_END_TO_START, SWIPE_DIRECTION_ANY})
@Retention(RetentionPolicy.SOURCE)
private @interface SwipeDirection {}
/**
* Swipe direction that only allows swiping in the direction of start-to-end. That is
* left-to-right in LTR, or right-to-left in RTL.
*/
public static final int SWIPE_DIRECTION_START_TO_END = 0;
/**
* Swipe direction that only allows swiping in the direction of end-to-start. That is
* right-to-left in LTR or left-to-right in RTL.
*/
public static final int SWIPE_DIRECTION_END_TO_START = 1;
/**
* Swipe direction which allows swiping in either direction.
*/
public static final int SWIPE_DIRECTION_ANY = 2;
private static final float DEFAULT_DRAG_DISMISS_THRESHOLD = 0.5f;
private static final float DEFAULT_ALPHA_START_DISTANCE = 0f;
private static final float DEFAULT_ALPHA_END_DISTANCE = DEFAULT_DRAG_DISMISS_THRESHOLD;
private ViewDragHelper mViewDragHelper;
private OnDismissListener mListener;
private boolean mIgnoreEvents;
private float mSensitivity = 0f;
private boolean mSensitivitySet;
private int mSwipeDirection = SWIPE_DIRECTION_ANY;
private float mDragDismissThreshold = DEFAULT_DRAG_DISMISS_THRESHOLD;
private float mAlphaStartSwipeDistance = DEFAULT_ALPHA_START_DISTANCE;
private float mAlphaEndSwipeDistance = DEFAULT_ALPHA_END_DISTANCE;
/**
* Callback interface used to notify the application that the view has been dismissed.
*/
public interface OnDismissListener {
/**
* Called when {@code view} has been dismissed via swiping.
*/
public void onDismiss(View view);
/**
* Called when the drag state has changed.
*
* @param state the new state. One of
* {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
*/
public void onDragStateChanged(int state);
}
/**
* Set the listener to be used when a dismiss event occurs.
*
* @param listener the listener to use.
*/
public void setListener(OnDismissListener listener) {
mListener = listener;
}
/**
* Sets the swipe direction for this behavior.
*
* @param direction one of the {@link #SWIPE_DIRECTION_START_TO_END},
* {@link #SWIPE_DIRECTION_END_TO_START} or {@link #SWIPE_DIRECTION_ANY}
*/
public void setSwipeDirection(@SwipeDirection int direction) {
mSwipeDirection = direction;
}
/**
* Set the threshold for telling if a view has been dragged enough to be dismissed.
*
* @param distance a ratio of a view's width, values are clamped to 0 >= x <= 1f;
*/
public void setDragDismissDistance(float distance) {
mDragDismissThreshold = clamp(0f, distance, 1f);
}
/**
* The minimum swipe distance before the view's alpha is modified.
*
* @param fraction the distance as a fraction of the view's width.
*/
public void setStartAlphaSwipeDistance(float fraction) {
mAlphaStartSwipeDistance = clamp(0f, fraction, 1f);
}
/**
* The maximum swipe distance for the view's alpha is modified.
*
* @param fraction the distance as a fraction of the view's width.
*/
public void setEndAlphaSwipeDistance(float fraction) {
mAlphaEndSwipeDistance = clamp(0f, fraction, 1f);
}
/**
* Set the sensitivity used for detecting the start of a swipe. This only takes effect if
* no touch handling has occured yet.
*
* @param sensitivity Multiplier for how sensitive we should be about detecting
* the start of a drag. Larger values are more sensitive. 1.0f is normal.
*/
public void setSensitivity(float sensitivity) {
mSensitivity = sensitivity;
mSensitivitySet = true;
}
@Override
public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
switch (MotionEventCompat.getActionMasked(event)) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
// Reset the ignore flag
if (mIgnoreEvents) {
mIgnoreEvents = false;
return false;
}
break;
default:
mIgnoreEvents = !parent.isPointInChildBounds(child,
(int) event.getX(), (int) event.getY());
break;
}
if (mIgnoreEvents) {
return false;
}
ensureViewDragHelper(parent);
return mViewDragHelper.shouldInterceptTouchEvent(event);
}
@Override
public boolean onTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
if (mViewDragHelper != null) {
mViewDragHelper.processTouchEvent(event);
return true;
}
return false;
}
private final ViewDragHelper.Callback mDragCallback = new ViewDragHelper.Callback() {
private int mOriginalCapturedViewLeft;
@Override
public boolean tryCaptureView(View child, int pointerId) {
mOriginalCapturedViewLeft = child.getLeft();
return true;
}
@Override
public void onViewDragStateChanged(int state) {
if (mListener != null) {
mListener.onDragStateChanged(state);
}
}
@Override
public void onViewReleased(View child, float xvel, float yvel) {
final int childWidth = child.getWidth();
int targetLeft;
boolean dismiss = false;
if (shouldDismiss(child, xvel)) {
targetLeft = child.getLeft() < mOriginalCapturedViewLeft
? mOriginalCapturedViewLeft - childWidth
: mOriginalCapturedViewLeft + childWidth;
dismiss = true;
} else {
// Else, reset back to the original left
targetLeft = mOriginalCapturedViewLeft;
}
if (mViewDragHelper.settleCapturedViewAt(targetLeft, child.getTop())) {
ViewCompat.postOnAnimation(child, new SettleRunnable(child, dismiss));
} else if (dismiss) {
child.setVisibility(View.GONE);
if (mListener != null) {
mListener.onDismiss(child);
}
}
}
private boolean shouldDismiss(View child, float xvel) {
if (xvel != 0f) {
final boolean isRtl = ViewCompat.getLayoutDirection(child)
== ViewCompat.LAYOUT_DIRECTION_RTL;
if (mSwipeDirection == SWIPE_DIRECTION_ANY) {
// We don't care about the direction so return true
return true;
} else if (mSwipeDirection == SWIPE_DIRECTION_START_TO_END) {
// We only allow start-to-end swiping, so the fling needs to be in the
// correct direction
return isRtl ? xvel < 0f : xvel > 0f;
} else if (mSwipeDirection == SWIPE_DIRECTION_END_TO_START) {
// We only allow end-to-start swiping, so the fling needs to be in the
// correct direction
return isRtl ? xvel > 0f : xvel < 0f;
}
} else {
final int distance = child.getLeft() - mOriginalCapturedViewLeft;
final int thresholdDistance = Math.round(child.getWidth() * mDragDismissThreshold);
return Math.abs(distance) >= thresholdDistance;
}
return false;
}
@Override
public int getViewHorizontalDragRange(View child) {
return child.getWidth();
}
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
final boolean isRtl = ViewCompat.getLayoutDirection(child)
== ViewCompat.LAYOUT_DIRECTION_RTL;
int min, max;
if (mSwipeDirection == SWIPE_DIRECTION_START_TO_END) {
if (isRtl) {
min = mOriginalCapturedViewLeft - child.getWidth();
max = mOriginalCapturedViewLeft;
} else {
min = mOriginalCapturedViewLeft;
max = mOriginalCapturedViewLeft + child.getWidth();
}
} else if (mSwipeDirection == SWIPE_DIRECTION_END_TO_START) {
if (isRtl) {
min = mOriginalCapturedViewLeft;
max = mOriginalCapturedViewLeft + child.getWidth();
} else {
min = mOriginalCapturedViewLeft - child.getWidth();
max = mOriginalCapturedViewLeft;
}
} else {
min = mOriginalCapturedViewLeft - child.getWidth();
max = mOriginalCapturedViewLeft + child.getWidth();
}
return clamp(min, left, max);
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
return child.getTop();
}
@Override
public void onViewPositionChanged(View child, int left, int top, int dx, int dy) {
final float distance = fraction(0, child.getWidth(), Math.abs(left - mOriginalCapturedViewLeft));
child.setAlpha(clamp(0f, 1f - distance, 1f));
}
};
private void ensureViewDragHelper(ViewGroup parent) {
if (mViewDragHelper == null) {
mViewDragHelper = mSensitivitySet
? ViewDragHelper.create(parent, mSensitivity, mDragCallback)
: ViewDragHelper.create(parent, mDragCallback);
}
}
private class SettleRunnable implements Runnable {
private final View mView;
private final boolean mDismiss;
SettleRunnable(View view, boolean dismiss) {
mView = view;
mDismiss = dismiss;
}
@Override
public void run() {
if (mViewDragHelper != null && mViewDragHelper.continueSettling(true)) {
ViewCompat.postOnAnimation(mView, this);
} else {
if (mDismiss) {
mView.setVisibility(View.GONE);
if (mListener != null) {
mListener.onDismiss(mView);
}
}
}
}
}
private static float clamp(float min, float value, float max) {
return Math.min(Math.max(min, value), max);
}
private static int clamp(int min, int value, int max) {
return Math.min(Math.max(min, value), max);
}
/**
* Retrieve the current drag state of this behavior. This will return one of
* {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
*
* @return The current drag state
*/
public int getDragState() {
return mViewDragHelper != null ? mViewDragHelper.getViewDragState() : STATE_IDLE;
}
/**
* The fraction that {@code value} is between {@code startValue} and {@code endValue}.
*/
static float fraction(float startValue, float endValue, float value) {
return (value - startValue) / (endValue - startValue);
}
}