Java tutorial
/******************************************************************************* * Copyright 2011, 2012 Chris Banes. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ package com.wangdao.our.spread_2.widget_pull; import android.content.Context; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.os.Build.VERSION; import android.os.Build.VERSION_CODES; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.ViewCompat; import android.util.AttributeSet; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.animation.DecelerateInterpolator; import android.view.animation.Interpolator; import android.widget.FrameLayout; import android.widget.LinearLayout; import com.wangdao.our.spread_2.R; import com.wangdao.our.spread_2.widget_pull.RotateLoadingLayout; import com.wangdao.our.spread_2.widget_pull.Utils; public abstract class PullToRefreshBase<T extends View> extends LinearLayout implements com.wangdao.our.spread_2.widget_pull.IPullToRefresh<T> { // =========================================================== // Constants // =========================================================== static final boolean DEBUG = true; static final boolean USE_HW_LAYERS = false; static final String LOG_TAG = "PullToRefresh"; static final float FRICTION = 2.0f; public static final int SMOOTH_SCROLL_DURATION_MS = 200; public static final int SMOOTH_SCROLL_LONG_DURATION_MS = 325; static final int DEMO_SCROLL_INTERVAL = 225; static final String STATE_STATE = "ptr_state"; static final String STATE_MODE = "ptr_mode"; static final String STATE_CURRENT_MODE = "ptr_current_mode"; static final String STATE_SCROLLING_REFRESHING_ENABLED = "ptr_disable_scrolling"; static final String STATE_SHOW_REFRESHING_VIEW = "ptr_show_refreshing_view"; static final String STATE_SUPER = "ptr_super"; // =========================================================== // Fields // =========================================================== private int mTouchSlop; private float mLastMotionX, mLastMotionY; private float mInitialMotionX, mInitialMotionY; private boolean mIsBeingDragged = false; private State mState = State.RESET; private Mode mMode = Mode.getDefault(); private Mode mCurrentMode; T mRefreshableView; private FrameLayout mRefreshableViewWrapper; private boolean mShowViewWhileRefreshing = true; private boolean mScrollingWhileRefreshingEnabled = false; private boolean mFilterTouchEvents = true; private boolean mOverScrollEnabled = true; private boolean mLayoutVisibilityChangesEnabled = true; private Interpolator mScrollAnimationInterpolator; private AnimationStyle mLoadingAnimationStyle = AnimationStyle.getDefault(); private com.wangdao.our.spread_2.widget_pull.LoadingLayout mHeaderLayout; private com.wangdao.our.spread_2.widget_pull.LoadingLayout mFooterLayout; private OnRefreshListener<T> mOnRefreshListener; private OnRefreshListener2<T> mOnRefreshListener2; private OnPullEventListener<T> mOnPullEventListener; private SmoothScrollRunnable mCurrentSmoothScrollRunnable; // =========================================================== // Constructors // =========================================================== public PullToRefreshBase(Context context) { super(context); init(context, null); } public PullToRefreshBase(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public PullToRefreshBase(Context context, Mode mode) { super(context); mMode = mode; init(context, null); } public PullToRefreshBase(Context context, Mode mode, AnimationStyle animStyle) { super(context); mMode = mode; mLoadingAnimationStyle = animStyle; init(context, null); } @Override public void addView(View child, int index, ViewGroup.LayoutParams params) { if (DEBUG) { Log.d(LOG_TAG, "addView: " + child.getClass().getSimpleName()); } final T refreshableView = getRefreshableView(); if (refreshableView instanceof ViewGroup) { ((ViewGroup) refreshableView).addView(child, index, params); } else { throw new UnsupportedOperationException("Refreshable View is not a ViewGroup so can't addView"); } } @Override public final boolean demo() { if (mMode.showHeaderLoadingLayout() && isReadyForPullStart()) { smoothScrollToAndBack(-getHeaderSize() * 2); return true; } else if (mMode.showFooterLoadingLayout() && isReadyForPullEnd()) { smoothScrollToAndBack(getFooterSize() * 2); return true; } return false; } @Override public final Mode getCurrentMode() { return mCurrentMode; } @Override public final boolean getFilterTouchEvents() { return mFilterTouchEvents; } @Override public final com.wangdao.our.spread_2.widget_pull.ILoadingLayout getLoadingLayoutProxy() { return getLoadingLayoutProxy(true, true); } @Override public final com.wangdao.our.spread_2.widget_pull.ILoadingLayout getLoadingLayoutProxy(boolean includeStart, boolean includeEnd) { return createLoadingLayoutProxy(includeStart, includeEnd); } @Override public final Mode getMode() { return mMode; } @Override public final T getRefreshableView() { return mRefreshableView; } @Override public final boolean getShowViewWhileRefreshing() { return mShowViewWhileRefreshing; } @Override public final State getState() { return mState; } /** * @deprecated See {@link #isScrollingWhileRefreshingEnabled()}. */ public final boolean isDisableScrollingWhileRefreshing() { return !isScrollingWhileRefreshingEnabled(); } @Override public final boolean isPullToRefreshEnabled() { return mMode.permitsPullToRefresh(); } @Override public final boolean isPullToRefreshOverScrollEnabled() { return VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD && mOverScrollEnabled && com.wangdao.our.spread_2.widget_pull.OverscrollHelper .isAndroidOverScrollEnabled(mRefreshableView); } @Override public final boolean isRefreshing() { return mState == State.REFRESHING || mState == State.MANUAL_REFRESHING; } @Override public final boolean isScrollingWhileRefreshingEnabled() { return mScrollingWhileRefreshingEnabled; } @Override public final boolean onInterceptTouchEvent(MotionEvent event) { if (!isPullToRefreshEnabled()) { return false; } final int action = event.getAction(); if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { mIsBeingDragged = false; return false; } if (action != MotionEvent.ACTION_DOWN && mIsBeingDragged) { return true; } switch (action) { case MotionEvent.ACTION_MOVE: { // If we're refreshing, and the flag is set. Eat all MOVE events if (!mScrollingWhileRefreshingEnabled && isRefreshing()) { return true; } if (isReadyForPull()) { final float y = event.getY(), x = event.getX(); final float diff, oppositeDiff, absDiff; // We need to use the correct values, based on scroll // direction switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: diff = x - mLastMotionX; oppositeDiff = y - mLastMotionY; break; case VERTICAL: default: diff = y - mLastMotionY; oppositeDiff = x - mLastMotionX; break; } absDiff = Math.abs(diff); if (absDiff > mTouchSlop && (!mFilterTouchEvents || absDiff > Math.abs(oppositeDiff))) { if (mMode.showHeaderLoadingLayout() && diff >= 1f && isReadyForPullStart()) { mLastMotionY = y; mLastMotionX = x; mIsBeingDragged = true; if (mMode == Mode.BOTH) { mCurrentMode = Mode.PULL_FROM_START; } } else if (mMode.showFooterLoadingLayout() && diff <= -1f && isReadyForPullEnd()) { mLastMotionY = y; mLastMotionX = x; mIsBeingDragged = true; if (mMode == Mode.BOTH) { mCurrentMode = Mode.PULL_FROM_END; } } } } break; } case MotionEvent.ACTION_DOWN: { if (isReadyForPull()) { mLastMotionY = mInitialMotionY = event.getY(); mLastMotionX = mInitialMotionX = event.getX(); mIsBeingDragged = false; } break; } } return mIsBeingDragged; } @Override public final void onRefreshComplete() { if (isRefreshing()) { setState(State.RESET); } } @Override public final boolean onTouchEvent(MotionEvent event) { if (!isPullToRefreshEnabled()) { return false; } // If we're refreshing, and the flag is set. Eat the event if (!mScrollingWhileRefreshingEnabled && isRefreshing()) { return true; } if (event.getAction() == MotionEvent.ACTION_DOWN && event.getEdgeFlags() != 0) { return false; } switch (event.getAction()) { case MotionEvent.ACTION_MOVE: { if (mIsBeingDragged) { mLastMotionY = event.getY(); mLastMotionX = event.getX(); pullEvent(); return true; } break; } case MotionEvent.ACTION_DOWN: { if (isReadyForPull()) { mLastMotionY = mInitialMotionY = event.getY(); mLastMotionX = mInitialMotionX = event.getX(); return true; } break; } case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: { if (mIsBeingDragged) { mIsBeingDragged = false; if (mState == State.RELEASE_TO_REFRESH && (null != mOnRefreshListener || null != mOnRefreshListener2)) { setState(State.REFRESHING, true); return true; } // If we're already refreshing, just scroll back to the top if (isRefreshing()) { smoothScrollTo(0); return true; } // If we haven't returned by here, then we're not in a state // to pull, so just reset setState(State.RESET); return true; } break; } } return false; } public final void setScrollingWhileRefreshingEnabled(boolean allowScrollingWhileRefreshing) { mScrollingWhileRefreshingEnabled = allowScrollingWhileRefreshing; } /** * @deprecated See {@link #setScrollingWhileRefreshingEnabled(boolean)} */ public void setDisableScrollingWhileRefreshing(boolean disableScrollingWhileRefreshing) { setScrollingWhileRefreshingEnabled(!disableScrollingWhileRefreshing); } @Override public final void setFilterTouchEvents(boolean filterEvents) { mFilterTouchEvents = filterEvents; } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy()}. */ public void setLastUpdatedLabel(CharSequence label) { getLoadingLayoutProxy().setLastUpdatedLabel(label); } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy()}. */ public void setLoadingDrawable(Drawable drawable) { getLoadingLayoutProxy().setLoadingDrawable(drawable); } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy(boolean, boolean)}. */ public void setLoadingDrawable(Drawable drawable, Mode mode) { getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()) .setLoadingDrawable(drawable); } @Override public void setLongClickable(boolean longClickable) { getRefreshableView().setLongClickable(longClickable); } @Override public final void setMode(Mode mode) { if (mode != mMode) { if (DEBUG) { Log.d(LOG_TAG, "Setting mode to: " + mode); } mMode = mode; updateUIForMode(); } } public void setOnPullEventListener(OnPullEventListener<T> listener) { mOnPullEventListener = listener; } @Override public final void setOnRefreshListener(OnRefreshListener<T> listener) { mOnRefreshListener = listener; mOnRefreshListener2 = null; } @Override public final void setOnRefreshListener(OnRefreshListener2<T> listener) { mOnRefreshListener2 = listener; mOnRefreshListener = null; } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy()}. */ public void setPullLabel(CharSequence pullLabel) { getLoadingLayoutProxy().setPullLabel(pullLabel); } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy(boolean, boolean)}. */ public void setPullLabel(CharSequence pullLabel, Mode mode) { getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()) .setPullLabel(pullLabel); } /** * @param enable Whether Pull-To-Refresh should be used * @deprecated This simple calls setMode with an appropriate mode based on * the passed value. */ public final void setPullToRefreshEnabled(boolean enable) { setMode(enable ? Mode.getDefault() : Mode.DISABLED); } @Override public final void setPullToRefreshOverScrollEnabled(boolean enabled) { mOverScrollEnabled = enabled; } @Override public final void setRefreshing() { setRefreshing(true); } @Override public final void setRefreshing(boolean doScroll) { if (!isRefreshing()) { setState(State.MANUAL_REFRESHING, doScroll); } } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy()}. */ public void setRefreshingLabel(CharSequence refreshingLabel) { getLoadingLayoutProxy().setRefreshingLabel(refreshingLabel); } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy(boolean, boolean)}. */ public void setRefreshingLabel(CharSequence refreshingLabel, Mode mode) { getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()) .setRefreshingLabel(refreshingLabel); } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy()}. */ public void setReleaseLabel(CharSequence releaseLabel) { setReleaseLabel(releaseLabel, Mode.BOTH); } /** * @deprecated You should now call this method on the result of * {@link #getLoadingLayoutProxy(boolean, boolean)}. */ public void setReleaseLabel(CharSequence releaseLabel, Mode mode) { getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()) .setReleaseLabel(releaseLabel); } public void setScrollAnimationInterpolator(Interpolator interpolator) { mScrollAnimationInterpolator = interpolator; } @Override public final void setShowViewWhileRefreshing(boolean showView) { mShowViewWhileRefreshing = showView; } /** * @return Either {@link Orientation#VERTICAL} or * {@link Orientation#HORIZONTAL} depending on the scroll direction. */ public abstract Orientation getPullToRefreshScrollDirection(); public final void setState(State state, final boolean... params) { mState = state; if (DEBUG) { Log.d(LOG_TAG, "State: " + mState.name()); } switch (mState) { case RESET: onReset(); break; case PULL_TO_REFRESH: onPullToRefresh(); break; case RELEASE_TO_REFRESH: onReleaseToRefresh(); break; case REFRESHING: case MANUAL_REFRESHING: onRefreshing(params[0]); break; case OVERSCROLLING: // NO-OP break; } // Call OnPullEventListener if (null != mOnPullEventListener) { mOnPullEventListener.onPullEvent(this, mState, mCurrentMode); } // if(null != mOnRefreshListener2){ // mOnRefreshListener2.onPullDownToRefresh(this); // LogUtils.i("testlist","pullrefresh"); // } } /** * Used internally for adding view. Need because we override addView to * pass-through to the Refreshable View */ protected final void addViewInternal(View child, int index, ViewGroup.LayoutParams params) { super.addView(child, index, params); } /** * Used internally for adding view. Need because we override addView to * pass-through to the Refreshable View */ protected final void addViewInternal(View child, ViewGroup.LayoutParams params) { super.addView(child, -1, params); } protected com.wangdao.our.spread_2.widget_pull.LoadingLayout createLoadingLayout(Context context, Mode mode, TypedArray attrs) { com.wangdao.our.spread_2.widget_pull.LoadingLayout layout = mLoadingAnimationStyle .createLoadingLayout(context, mode, getPullToRefreshScrollDirection(), attrs); layout.setVisibility(View.INVISIBLE); return layout; } /** * Used internally for {@link #getLoadingLayoutProxy(boolean, boolean)}. * Allows derivative classes to include any extra LoadingLayouts. */ protected com.wangdao.our.spread_2.widget_pull.LoadingLayoutProxy createLoadingLayoutProxy( final boolean includeStart, final boolean includeEnd) { com.wangdao.our.spread_2.widget_pull.LoadingLayoutProxy proxy = new com.wangdao.our.spread_2.widget_pull.LoadingLayoutProxy(); if (includeStart && mMode.showHeaderLoadingLayout()) { proxy.addLayout(mHeaderLayout); } if (includeEnd && mMode.showFooterLoadingLayout()) { proxy.addLayout(mFooterLayout); } return proxy; } /** * This is implemented by derived classes to return the created View. If you * need to use a custom View (such as a custom ListView), override this * method and return an instance of your custom class. * <p/> * Be sure to set the ID of the view in this method, especially if you're * using a ListActivity or ListFragment. * * @param context Context to create view with * @param attrs AttributeSet from wrapped class. Means that anything you * include in the XML layout declaration will be routed to the * created View * @return New instance of the Refreshable View */ protected abstract T createRefreshableView(Context context, AttributeSet attrs); protected final void disableLoadingLayoutVisibilityChanges() { mLayoutVisibilityChangesEnabled = false; } protected final com.wangdao.our.spread_2.widget_pull.LoadingLayout getFooterLayout() { return mFooterLayout; } protected final int getFooterSize() { return mFooterLayout.getContentSize(); } protected final com.wangdao.our.spread_2.widget_pull.LoadingLayout getHeaderLayout() { return mHeaderLayout; } protected final int getHeaderSize() { return mHeaderLayout.getContentSize(); } protected int getPullToRefreshScrollDuration() { return SMOOTH_SCROLL_DURATION_MS; } protected int getPullToRefreshScrollDurationLonger() { return SMOOTH_SCROLL_LONG_DURATION_MS; } protected FrameLayout getRefreshableViewWrapper() { return mRefreshableViewWrapper; } /** * Allows Derivative classes to handle the XML Attrs without creating a * TypedArray themsevles * * @param a - TypedArray of PullToRefresh Attributes */ protected void handleStyledAttributes(TypedArray a) { } /** * Implemented by derived class to return whether the View is in a state * where the user can Pull to Refresh by scrolling from the end. * * @return true if the View is currently in the correct state (for example, * bottom of a ListView) */ protected abstract boolean isReadyForPullEnd(); /** * Implemented by derived class to return whether the View is in a state * where the user can Pull to Refresh by scrolling from the start. * * @return true if the View is currently the correct state (for example, top * of a ListView) */ protected abstract boolean isReadyForPullStart(); /** * Called by {@link #onRestoreInstanceState(Parcelable)} so that derivative * classes can handle their saved instance state. * * @param savedInstanceState - Bundle which contains saved instance state. */ protected void onPtrRestoreInstanceState(Bundle savedInstanceState) { } /** * Called by {@link #onSaveInstanceState()} so that derivative classes can * save their instance state. * * @param saveState - Bundle to be updated with saved state. */ protected void onPtrSaveInstanceState(Bundle saveState) { } /** * Called when the UI has been to be updated to be in the * {@link State#PULL_TO_REFRESH} state. */ protected void onPullToRefresh() { switch (mCurrentMode) { case PULL_FROM_END: mFooterLayout.pullToRefresh(); break; case PULL_FROM_START: mHeaderLayout.pullToRefresh(); break; default: // NO-OP break; } } /** * Called when the UI has been to be updated to be in the * {@link State#REFRESHING} or {@link State#MANUAL_REFRESHING} state. * * @param doScroll - Whether the UI should scroll for this event. */ protected void onRefreshing(final boolean doScroll) { if (mMode.showHeaderLoadingLayout()) { mHeaderLayout.refreshing(); } if (mMode.showFooterLoadingLayout()) { mFooterLayout.refreshing(); } if (doScroll) { if (mShowViewWhileRefreshing) { // Call Refresh Listener when the Scroll has finished OnSmoothScrollFinishedListener listener = new OnSmoothScrollFinishedListener() { @Override public void onSmoothScrollFinished() { callRefreshListener(); } }; switch (mCurrentMode) { case MANUAL_REFRESH_ONLY: case PULL_FROM_END: smoothScrollTo(getFooterSize(), listener); break; default: case PULL_FROM_START: smoothScrollTo(-getHeaderSize(), listener); break; } } else { smoothScrollTo(0); } } else { // We're not scrolling, so just call Refresh Listener now callRefreshListener(); } } /** * Called when the UI has been to be updated to be in the * {@link State#RELEASE_TO_REFRESH} state. */ protected void onReleaseToRefresh() { switch (mCurrentMode) { case PULL_FROM_END: mFooterLayout.releaseToRefresh(); break; case PULL_FROM_START: mHeaderLayout.releaseToRefresh(); break; default: // NO-OP break; } } /** * Called when the UI has been to be updated to be in the * {@link State#RESET} state. */ protected void onReset() { mIsBeingDragged = false; mLayoutVisibilityChangesEnabled = true; // Always reset both layouts, just in case... mHeaderLayout.reset(); mFooterLayout.reset(); smoothScrollTo(0); } @Override protected final void onRestoreInstanceState(Parcelable state) { if (state instanceof Bundle) { Bundle bundle = (Bundle) state; setMode(Mode.mapIntToValue(bundle.getInt(STATE_MODE, 0))); mCurrentMode = Mode.mapIntToValue(bundle.getInt(STATE_CURRENT_MODE, 0)); mScrollingWhileRefreshingEnabled = bundle.getBoolean(STATE_SCROLLING_REFRESHING_ENABLED, false); mShowViewWhileRefreshing = bundle.getBoolean(STATE_SHOW_REFRESHING_VIEW, true); // Let super Restore Itself super.onRestoreInstanceState(bundle.getParcelable(STATE_SUPER)); State viewState = State.mapIntToValue(bundle.getInt(STATE_STATE, 0)); if (viewState == State.REFRESHING || viewState == State.MANUAL_REFRESHING) { setState(viewState, true); } // Now let derivative classes restore their state onPtrRestoreInstanceState(bundle); return; } super.onRestoreInstanceState(state); } @Override protected final Parcelable onSaveInstanceState() { Bundle bundle = new Bundle(); // Let derivative classes get a chance to save state first, that way we // can make sure they don't overrite any of our values onPtrSaveInstanceState(bundle); bundle.putInt(STATE_STATE, mState.getIntValue()); bundle.putInt(STATE_MODE, mMode.getIntValue()); bundle.putInt(STATE_CURRENT_MODE, mCurrentMode.getIntValue()); bundle.putBoolean(STATE_SCROLLING_REFRESHING_ENABLED, mScrollingWhileRefreshingEnabled); bundle.putBoolean(STATE_SHOW_REFRESHING_VIEW, mShowViewWhileRefreshing); bundle.putParcelable(STATE_SUPER, super.onSaveInstanceState()); return bundle; } @Override protected final void onSizeChanged(int w, int h, int oldw, int oldh) { if (DEBUG) { Log.d(LOG_TAG, String.format("onSizeChanged. W: %d, H: %d", w, h)); } super.onSizeChanged(w, h, oldw, oldh); // We need to update the header/footer when our size changes refreshLoadingViewsSize(); // Update the Refreshable View layout refreshRefreshableViewSize(w, h); /** * As we're currently in a Layout Pass, we need to schedule another one * to layout any changes we've made here */ post(new Runnable() { @Override public void run() { requestLayout(); } }); } /** * Re-measure the Loading Views height, and adjust internal padding as * necessary */ protected final void refreshLoadingViewsSize() { final int maximumPullScroll = (int) (getMaximumPullScroll() * 1.2f); int pLeft = getPaddingLeft(); int pTop = getPaddingTop(); int pRight = getPaddingRight(); int pBottom = getPaddingBottom(); switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: if (mMode.showHeaderLoadingLayout()) { mHeaderLayout.setWidth(maximumPullScroll); pLeft = -maximumPullScroll; } else { pLeft = 0; } if (mMode.showFooterLoadingLayout()) { mFooterLayout.setWidth(maximumPullScroll); pRight = -maximumPullScroll; } else { pRight = 0; } break; case VERTICAL: if (mMode.showHeaderLoadingLayout()) { mHeaderLayout.setHeight(maximumPullScroll); pTop = -maximumPullScroll; } else { pTop = 0; } if (mMode.showFooterLoadingLayout()) { mFooterLayout.setHeight(maximumPullScroll); pBottom = -maximumPullScroll; } else { pBottom = 0; } break; } if (DEBUG) { Log.d(LOG_TAG, String.format("Setting Padding. L: %d, T: %d, R: %d, B: %d", pLeft, pTop, pRight, pBottom)); } setPadding(pLeft, pTop, pRight, pBottom); } protected final void refreshRefreshableViewSize(int width, int height) { // We need to set the Height of the Refreshable View to the same as // this layout LayoutParams lp = (LayoutParams) mRefreshableViewWrapper.getLayoutParams(); switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: if (lp.width != width) { lp.width = width; mRefreshableViewWrapper.requestLayout(); } break; case VERTICAL: if (lp.height != height) { lp.height = height; mRefreshableViewWrapper.requestLayout(); } break; } } /** * Helper method which just calls scrollTo() in the correct scrolling * direction. * * @param value - New Scroll value */ protected final void setHeaderScroll(int value) { if (DEBUG) { Log.d(LOG_TAG, "setHeaderScroll: " + value); } // Clamp value to with pull scroll range final int maximumPullScroll = getMaximumPullScroll(); value = Math.min(maximumPullScroll, Math.max(-maximumPullScroll, value)); if (mLayoutVisibilityChangesEnabled) { if (value < 0) { mHeaderLayout.setVisibility(View.VISIBLE); } else if (value > 0) { mFooterLayout.setVisibility(View.VISIBLE); } else { mHeaderLayout.setVisibility(View.INVISIBLE); mFooterLayout.setVisibility(View.INVISIBLE); } } if (USE_HW_LAYERS) { /** * Use a Hardware Layer on the Refreshable View if we've scrolled at * all. We don't use them on the Header/Footer Views as they change * often, which would negate any HW layer performance boost. */ com.wangdao.our.spread_2.widget_pull.ViewCompat.setLayerType(mRefreshableViewWrapper, value != 0 ? View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE); } switch (getPullToRefreshScrollDirection()) { case VERTICAL: scrollTo(0, value); break; case HORIZONTAL: scrollTo(value, 0); break; } } /** * Smooth Scroll to position using the default duration of * {@value #SMOOTH_SCROLL_DURATION_MS} ms. * * @param scrollValue - Position to scroll to */ protected final void smoothScrollTo(int scrollValue) { smoothScrollTo(scrollValue, getPullToRefreshScrollDuration()); } /** * Smooth Scroll to position using the default duration of * {@value #SMOOTH_SCROLL_DURATION_MS} ms. * * @param scrollValue - Position to scroll to * @param listener - Listener for scroll */ protected final void smoothScrollTo(int scrollValue, OnSmoothScrollFinishedListener listener) { smoothScrollTo(scrollValue, getPullToRefreshScrollDuration(), 0, listener); } /** * Smooth Scroll to position using the longer default duration of * {@value #SMOOTH_SCROLL_LONG_DURATION_MS} ms. * * @param scrollValue - Position to scroll to */ protected final void smoothScrollToLonger(int scrollValue) { smoothScrollTo(scrollValue, getPullToRefreshScrollDurationLonger()); } /** * Updates the View State when the mode has been set. This does not do any * checking that the mode is different to current state so always updates. */ protected void updateUIForMode() { // We need to use the correct LayoutParam values, based on scroll // direction final LayoutParams lp = getLoadingLayoutLayoutParams(); // Remove Header, and then add Header Loading View again if needed if (this == mHeaderLayout.getParent()) { removeView(mHeaderLayout); } if (mMode.showHeaderLoadingLayout()) { addViewInternal(mHeaderLayout, 0, lp); } // Remove Footer, and then add Footer Loading View again if needed if (this == mFooterLayout.getParent()) { removeView(mFooterLayout); } if (mMode.showFooterLoadingLayout()) { addViewInternal(mFooterLayout, lp); } // Hide Loading Views refreshLoadingViewsSize(); // If we're not using Mode.BOTH, set mCurrentMode to mMode, otherwise // set it to pull down mCurrentMode = (mMode != Mode.BOTH) ? mMode : Mode.PULL_FROM_START; } private void addRefreshableView(Context context, T refreshableView) { mRefreshableViewWrapper = new FrameLayout(context); mRefreshableViewWrapper.addView(refreshableView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); addViewInternal(mRefreshableViewWrapper, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); } private void callRefreshListener() { if (null != mOnRefreshListener) { mOnRefreshListener.onRefresh(this); } else if (null != mOnRefreshListener2) { if (mCurrentMode == Mode.PULL_FROM_START) { mOnRefreshListener2.onPullDownToRefresh(this); } else if (mCurrentMode == Mode.PULL_FROM_END) { mOnRefreshListener2.onPullUpToRefresh(this); } } } @SuppressWarnings("deprecation") private void init(Context context, AttributeSet attrs) { switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: setOrientation(LinearLayout.HORIZONTAL); break; case VERTICAL: default: setOrientation(LinearLayout.VERTICAL); break; } setGravity(Gravity.CENTER); ViewConfiguration config = ViewConfiguration.get(context); mTouchSlop = config.getScaledTouchSlop(); // Styleables from XML TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PullToRefresh); if (a.hasValue(R.styleable.PullToRefresh_ptrMode)) { mMode = Mode.mapIntToValue(a.getInteger(R.styleable.PullToRefresh_ptrMode, 0)); } if (a.hasValue(R.styleable.PullToRefresh_ptrAnimationStyle)) { mLoadingAnimationStyle = AnimationStyle .mapIntToValue(a.getInteger(R.styleable.PullToRefresh_ptrAnimationStyle, 0)); } // Refreshable View // By passing the attrs, we can add ListView/GridView params via XML mRefreshableView = createRefreshableView(context, attrs); addRefreshableView(context, mRefreshableView); // We need to create now layouts now mHeaderLayout = createLoadingLayout(context, Mode.PULL_FROM_START, a); mFooterLayout = createLoadingLayout(context, Mode.PULL_FROM_END, a); /** * Styleables from XML */ if (a.hasValue(R.styleable.PullToRefresh_ptrRefreshableViewBackground)) { Drawable background = a.getDrawable(R.styleable.PullToRefresh_ptrRefreshableViewBackground); if (null != background) { mRefreshableView.setBackgroundDrawable(background); } } else if (a.hasValue(R.styleable.PullToRefresh_ptrAdapterViewBackground)) { Utils.warnDeprecation("ptrAdapterViewBackground", "ptrRefreshableViewBackground"); Drawable background = a.getDrawable(R.styleable.PullToRefresh_ptrAdapterViewBackground); if (null != background) { mRefreshableView.setBackgroundDrawable(background); } } if (a.hasValue(R.styleable.PullToRefresh_ptrOverScroll)) { mOverScrollEnabled = a.getBoolean(R.styleable.PullToRefresh_ptrOverScroll, true); } if (a.hasValue(R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled)) { mScrollingWhileRefreshingEnabled = a .getBoolean(R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled, false); } // Let the derivative classes have a go at handling attributes, then // recycle them... handleStyledAttributes(a); a.recycle(); // Finally update the UI for the modes updateUIForMode(); } private boolean isReadyForPull() { switch (mMode) { case PULL_FROM_START: return isReadyForPullStart(); case PULL_FROM_END: return isReadyForPullEnd(); case BOTH: return isReadyForPullEnd() || isReadyForPullStart(); default: return false; } } /** * Actions a Pull Event * * @return true if the Event has been handled, false if there has been no * change */ private void pullEvent() { final int newScrollValue; final int itemDimension; final float initialMotionValue, lastMotionValue; switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: initialMotionValue = mInitialMotionX; lastMotionValue = mLastMotionX; break; case VERTICAL: default: initialMotionValue = mInitialMotionY; lastMotionValue = mLastMotionY; break; } switch (mCurrentMode) { case PULL_FROM_END: newScrollValue = Math.round(Math.max(initialMotionValue - lastMotionValue, 0) / FRICTION); itemDimension = getFooterSize(); break; case PULL_FROM_START: default: newScrollValue = Math.round(Math.min(initialMotionValue - lastMotionValue, 0) / FRICTION); itemDimension = getHeaderSize(); break; } setHeaderScroll(newScrollValue); if (newScrollValue != 0 && !isRefreshing()) { float scale = Math.abs(newScrollValue) / (float) itemDimension; switch (mCurrentMode) { case PULL_FROM_END: mFooterLayout.onPull(scale); break; case PULL_FROM_START: default: mHeaderLayout.onPull(scale); break; } if (mState != State.PULL_TO_REFRESH && itemDimension >= Math.abs(newScrollValue)) { setState(State.PULL_TO_REFRESH); } else if (mState == State.PULL_TO_REFRESH && itemDimension < Math.abs(newScrollValue)) { setState(State.RELEASE_TO_REFRESH); } } } private LayoutParams getLoadingLayoutLayoutParams() { switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT); case VERTICAL: default: return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); } } private int getMaximumPullScroll() { switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: return Math.round(getWidth() / FRICTION); case VERTICAL: default: return Math.round(getHeight() / FRICTION); } } /** * Smooth Scroll to position using the specific duration * * @param scrollValue - Position to scroll to * @param duration - Duration of animation in milliseconds */ private final void smoothScrollTo(int scrollValue, long duration) { smoothScrollTo(scrollValue, duration, 0, null); } private final void smoothScrollTo(int newScrollValue, long duration, long delayMillis, OnSmoothScrollFinishedListener listener) { if (null != mCurrentSmoothScrollRunnable) { mCurrentSmoothScrollRunnable.stop(); } final int oldScrollValue; switch (getPullToRefreshScrollDirection()) { case HORIZONTAL: oldScrollValue = getScrollX(); break; case VERTICAL: default: oldScrollValue = getScrollY(); break; } if (oldScrollValue != newScrollValue) { if (null == mScrollAnimationInterpolator) { // Default interpolator is a Decelerate Interpolator mScrollAnimationInterpolator = new DecelerateInterpolator(); } mCurrentSmoothScrollRunnable = new SmoothScrollRunnable(oldScrollValue, newScrollValue, duration, listener); if (delayMillis > 0) { postDelayed(mCurrentSmoothScrollRunnable, delayMillis); } else { post(mCurrentSmoothScrollRunnable); } } } private final void smoothScrollToAndBack(int y) { smoothScrollTo(y, SMOOTH_SCROLL_DURATION_MS, 0, new OnSmoothScrollFinishedListener() { @Override public void onSmoothScrollFinished() { smoothScrollTo(0, SMOOTH_SCROLL_DURATION_MS, DEMO_SCROLL_INTERVAL, null); } }); } public static enum AnimationStyle { /** * This is the default for Android-PullToRefresh. Allows you to use any * drawable, which is automatically rotated and used as a Progress Bar. */ ROTATE, /** * This is the old default, and what is commonly used on iOS. Uses an * arrow image which flips depending on where the user has scrolled. */ FLIP; static AnimationStyle getDefault() { return ROTATE; } /** * Maps an int to a specific mode. This is needed when saving state, or * inflating the view from XML where the mode is given through a attr * int. * * @param modeInt - int to map a Mode to * @return Mode that modeInt maps to, or ROTATE by default. */ static AnimationStyle mapIntToValue(int modeInt) { switch (modeInt) { case 0x0: default: return ROTATE; case 0x1: return FLIP; } } com.wangdao.our.spread_2.widget_pull.LoadingLayout createLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) { switch (this) { case ROTATE: default: return new RotateLoadingLayout(context, mode, scrollDirection, attrs); case FLIP: return new com.wangdao.our.spread_2.widget_pull.FlipLoadingLayout(context, mode, scrollDirection, attrs); } } } public static enum Mode { /** * Disable all Pull-to-Refresh gesture and Refreshing handling */ DISABLED(0x0), /** * Only allow the user to Pull from the start of the Refreshable View to * refresh. The start is either the Top or Left, depending on the * scrolling direction. */ PULL_FROM_START(0x1), /** * Only allow the user to Pull from the end of the Refreshable View to * refresh. The start is either the Bottom or Right, depending on the * scrolling direction. */ PULL_FROM_END(0x2), /** * Allow the user to both Pull from the start, from the end to refresh. */ BOTH(0x3), /** * Disables Pull-to-Refresh gesture handling, but allows manually * setting the Refresh state via * {@link PullToRefreshBase#setRefreshing() setRefreshing()}. */ MANUAL_REFRESH_ONLY(0x4); /** * @deprecated Use {@link #PULL_FROM_START} from now on. */ public static Mode PULL_DOWN_TO_REFRESH = Mode.PULL_FROM_START; /** * @deprecated Use {@link #PULL_FROM_END} from now on. */ public static Mode PULL_UP_TO_REFRESH = Mode.PULL_FROM_END; /** * Maps an int to a specific mode. This is needed when saving state, or * inflating the view from XML where the mode is given through a attr * int. * * @param modeInt - int to map a Mode to * @return Mode that modeInt maps to, or PULL_FROM_START by default. */ static Mode mapIntToValue(final int modeInt) { for (Mode value : Mode.values()) { if (modeInt == value.getIntValue()) { return value; } } // If not, return default return getDefault(); } static Mode getDefault() { return PULL_FROM_START; } private int mIntValue; // The modeInt values need to match those from attrs.xml Mode(int modeInt) { mIntValue = modeInt; } /** * @return true if the mode permits Pull-to-Refresh */ boolean permitsPullToRefresh() { return !(this == DISABLED || this == MANUAL_REFRESH_ONLY); } /** * @return true if this mode wants the Loading Layout Header to be shown */ public boolean showHeaderLoadingLayout() { return this == PULL_FROM_START || this == BOTH; } /** * @return true if this mode wants the Loading Layout Footer to be shown */ public boolean showFooterLoadingLayout() { return this == PULL_FROM_END || this == BOTH || this == MANUAL_REFRESH_ONLY; } int getIntValue() { return mIntValue; } } // =========================================================== // Inner, Anonymous Classes, and Enumerations // =========================================================== /** * Simple Listener that allows you to be notified when the user has scrolled * to the end of the AdapterView. See ( * {@link PullToRefreshAdapterViewBase#setOnLastItemVisibleListener}. * * @author Chris Banes */ public static interface OnLastItemVisibleListener { /** * Called when the user has scrolled to the end of the list */ public void onLastItemVisible(); } /** * Listener that allows you to be notified when the user has started or * finished a touch event. Useful when you want to append extra UI events * (such as sounds). See ( * {@link PullToRefreshAdapterViewBase#setOnPullEventListener}. * * @author Chris Banes */ public static interface OnPullEventListener<V extends View> { /** * Called when the internal state has been changed, usually by the user * pulling. * * @param refreshView - View which has had it's state change. * @param state - The new state of View. * @param direction - One of {@link Mode#PULL_FROM_START} or * {@link Mode#PULL_FROM_END} depending on which direction * the user is pulling. Only useful when <var>state</var> is * {@link State#PULL_TO_REFRESH} or * {@link State#RELEASE_TO_REFRESH}. */ public void onPullEvent(final PullToRefreshBase<V> refreshView, State state, Mode direction); } /** * Simple Listener to listen for any callbacks to Refresh. * * @author Chris Banes */ public static interface OnRefreshListener<V extends View> { /** * onRefresh will be called for both a Pull from start, and Pull from * end */ public void onRefresh(final PullToRefreshBase<V> refreshView); } /** * An advanced version of the Listener to listen for callbacks to Refresh. * This listener is different as it allows you to differentiate between Pull * Ups, and Pull Downs. * * @author Chris Banes */ public static interface OnRefreshListener2<V extends View> { // TODO These methods need renaming to START/END rather than DOWN/UP /** * onPullDownToRefresh will be called only when the user has Pulled from * the start, and released. */ public void onPullDownToRefresh(final PullToRefreshBase<V> refreshView); /** * onPullUpToRefresh will be called only when the user has Pulled from * the end, and released. */ public void onPullUpToRefresh(final PullToRefreshBase<V> refreshView); } public static enum Orientation { VERTICAL, HORIZONTAL; } public static enum State { /** * When the UI is in a state which means that user is not interacting * with the Pull-to-Refresh function. */ RESET(0x0), /** * When the UI is being pulled by the user, but has not been pulled far * enough so that it refreshes when released. */ PULL_TO_REFRESH(0x1), /** * When the UI is being pulled by the user, and <strong>has</strong> * been pulled far enough so that it will refresh when released. */ RELEASE_TO_REFRESH(0x2), /** * When the UI is currently refreshing, caused by a pull gesture. */ REFRESHING(0x8), /** * When the UI is currently refreshing, caused by a call to * {@link PullToRefreshBase#setRefreshing() setRefreshing()}. */ MANUAL_REFRESHING(0x9), /** * When the UI is currently overscrolling, caused by a fling on the * Refreshable View. */ OVERSCROLLING(0x10); /** * Maps an int to a specific state. This is needed when saving state. * * @param stateInt - int to map a State to * @return State that stateInt maps to */ static State mapIntToValue(final int stateInt) { for (State value : State.values()) { if (stateInt == value.getIntValue()) { return value; } } // If not, return default return RESET; } private int mIntValue; State(int intValue) { mIntValue = intValue; } int getIntValue() { return mIntValue; } } final class SmoothScrollRunnable implements Runnable { private final Interpolator mInterpolator; private final int mScrollToY; private final int mScrollFromY; private final long mDuration; private OnSmoothScrollFinishedListener mListener; private boolean mContinueRunning = true; private long mStartTime = -1; private int mCurrentY = -1; public SmoothScrollRunnable(int fromY, int toY, long duration, OnSmoothScrollFinishedListener listener) { mScrollFromY = fromY; mScrollToY = toY; mInterpolator = mScrollAnimationInterpolator; mDuration = duration; mListener = listener; } @Override public void run() { /** * Only set mStartTime if this is the first time we're starting, * else actually calculate the Y delta */ if (mStartTime == -1) { mStartTime = System.currentTimeMillis(); } else { /** * We do do all calculations in long to reduce software float * calculations. We use 1000 as it gives us good accuracy and * small rounding errors */ long normalizedTime = (1000 * (System.currentTimeMillis() - mStartTime)) / mDuration; normalizedTime = Math.max(Math.min(normalizedTime, 1000), 0); final int deltaY = Math.round( (mScrollFromY - mScrollToY) * mInterpolator.getInterpolation(normalizedTime / 1000f)); mCurrentY = mScrollFromY - deltaY; setHeaderScroll(mCurrentY); } // If we're not at the target Y, keep going... if (mContinueRunning && mScrollToY != mCurrentY) { ViewCompat.postOnAnimation(PullToRefreshBase.this, this); } else { if (null != mListener) { mListener.onSmoothScrollFinished(); } } } public void stop() { mContinueRunning = false; removeCallbacks(this); } } static interface OnSmoothScrollFinishedListener { void onSmoothScrollFinished(); } }