--- /dev/null
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * 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.actionbarsherlock.internal.widget;
+
+import android.content.Context;
+import android.database.DataSetObserver;
+import android.os.Parcelable;
+import android.os.SystemClock;
+import android.util.AttributeSet;
+import android.util.SparseArray;
+import android.view.ContextMenu;
+import android.view.SoundEffectConstants;
+import android.view.View;
+import android.view.ViewDebug;
+import android.view.ViewGroup;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityNodeInfo;
+import android.widget.Adapter;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ListView;
+
+
+/**
+ * An AdapterView is a view whose children are determined by an {@link Adapter}.
+ *
+ * <p>
+ * See {@link ListView}, {@link GridView}, {@link Spinner} and
+ * {@link Gallery} for commonly used subclasses of AdapterView.
+ *
+ * <div class="special reference">
+ * <h3>Developer Guides</h3>
+ * <p>For more information about using AdapterView, read the
+ * <a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a>
+ * developer guide.</p></div>
+ */
+public abstract class IcsAdapterView<T extends Adapter> extends ViewGroup {
+
+ /**
+ * The item view type returned by {@link Adapter#getItemViewType(int)} when
+ * the adapter does not want the item's view recycled.
+ */
+ public static final int ITEM_VIEW_TYPE_IGNORE = -1;
+
+ /**
+ * The item view type returned by {@link Adapter#getItemViewType(int)} when
+ * the item is a header or footer.
+ */
+ public static final int ITEM_VIEW_TYPE_HEADER_OR_FOOTER = -2;
+
+ /**
+ * The position of the first child displayed
+ */
+ @ViewDebug.ExportedProperty(category = "scrolling")
+ int mFirstPosition = 0;
+
+ /**
+ * The offset in pixels from the top of the AdapterView to the top
+ * of the view to select during the next layout.
+ */
+ int mSpecificTop;
+
+ /**
+ * Position from which to start looking for mSyncRowId
+ */
+ int mSyncPosition;
+
+ /**
+ * Row id to look for when data has changed
+ */
+ long mSyncRowId = INVALID_ROW_ID;
+
+ /**
+ * Height of the view when mSyncPosition and mSyncRowId where set
+ */
+ long mSyncHeight;
+
+ /**
+ * True if we need to sync to mSyncRowId
+ */
+ boolean mNeedSync = false;
+
+ /**
+ * Indicates whether to sync based on the selection or position. Possible
+ * values are {@link #SYNC_SELECTED_POSITION} or
+ * {@link #SYNC_FIRST_POSITION}.
+ */
+ int mSyncMode;
+
+ /**
+ * Our height after the last layout
+ */
+ private int mLayoutHeight;
+
+ /**
+ * Sync based on the selected child
+ */
+ static final int SYNC_SELECTED_POSITION = 0;
+
+ /**
+ * Sync based on the first child displayed
+ */
+ static final int SYNC_FIRST_POSITION = 1;
+
+ /**
+ * Maximum amount of time to spend in {@link #findSyncPosition()}
+ */
+ static final int SYNC_MAX_DURATION_MILLIS = 100;
+
+ /**
+ * Indicates that this view is currently being laid out.
+ */
+ boolean mInLayout = false;
+
+ /**
+ * The listener that receives notifications when an item is selected.
+ */
+ OnItemSelectedListener mOnItemSelectedListener;
+
+ /**
+ * The listener that receives notifications when an item is clicked.
+ */
+ OnItemClickListener mOnItemClickListener;
+
+ /**
+ * The listener that receives notifications when an item is long clicked.
+ */
+ OnItemLongClickListener mOnItemLongClickListener;
+
+ /**
+ * True if the data has changed since the last layout
+ */
+ boolean mDataChanged;
+
+ /**
+ * The position within the adapter's data set of the item to select
+ * during the next layout.
+ */
+ @ViewDebug.ExportedProperty(category = "list")
+ int mNextSelectedPosition = INVALID_POSITION;
+
+ /**
+ * The item id of the item to select during the next layout.
+ */
+ long mNextSelectedRowId = INVALID_ROW_ID;
+
+ /**
+ * The position within the adapter's data set of the currently selected item.
+ */
+ @ViewDebug.ExportedProperty(category = "list")
+ int mSelectedPosition = INVALID_POSITION;
+
+ /**
+ * The item id of the currently selected item.
+ */
+ long mSelectedRowId = INVALID_ROW_ID;
+
+ /**
+ * View to show if there are no items to show.
+ */
+ private View mEmptyView;
+
+ /**
+ * The number of items in the current adapter.
+ */
+ @ViewDebug.ExportedProperty(category = "list")
+ int mItemCount;
+
+ /**
+ * The number of items in the adapter before a data changed event occurred.
+ */
+ int mOldItemCount;
+
+ /**
+ * Represents an invalid position. All valid positions are in the range 0 to 1 less than the
+ * number of items in the current adapter.
+ */
+ public static final int INVALID_POSITION = -1;
+
+ /**
+ * Represents an empty or invalid row id
+ */
+ public static final long INVALID_ROW_ID = Long.MIN_VALUE;
+
+ /**
+ * The last selected position we used when notifying
+ */
+ int mOldSelectedPosition = INVALID_POSITION;
+
+ /**
+ * The id of the last selected position we used when notifying
+ */
+ long mOldSelectedRowId = INVALID_ROW_ID;
+
+ /**
+ * Indicates what focusable state is requested when calling setFocusable().
+ * In addition to this, this view has other criteria for actually
+ * determining the focusable state (such as whether its empty or the text
+ * filter is shown).
+ *
+ * @see #setFocusable(boolean)
+ * @see #checkFocus()
+ */
+ private boolean mDesiredFocusableState;
+ private boolean mDesiredFocusableInTouchModeState;
+
+ private SelectionNotifier mSelectionNotifier;
+ /**
+ * When set to true, calls to requestLayout() will not propagate up the parent hierarchy.
+ * This is used to layout the children during a layout pass.
+ */
+ boolean mBlockLayoutRequests = false;
+
+ public IcsAdapterView(Context context) {
+ super(context);
+ }
+
+ public IcsAdapterView(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ }
+
+ public IcsAdapterView(Context context, AttributeSet attrs, int defStyle) {
+ super(context, attrs, defStyle);
+ }
+
+ /**
+ * Register a callback to be invoked when an item in this AdapterView has
+ * been clicked.
+ *
+ * @param listener The callback that will be invoked.
+ */
+ public void setOnItemClickListener(OnItemClickListener listener) {
+ mOnItemClickListener = listener;
+ }
+
+ /**
+ * @return The callback to be invoked with an item in this AdapterView has
+ * been clicked, or null id no callback has been set.
+ */
+ public final OnItemClickListener getOnItemClickListener() {
+ return mOnItemClickListener;
+ }
+
+ /**
+ * Call the OnItemClickListener, if it is defined.
+ *
+ * @param view The view within the AdapterView that was clicked.
+ * @param position The position of the view in the adapter.
+ * @param id The row id of the item that was clicked.
+ * @return True if there was an assigned OnItemClickListener that was
+ * called, false otherwise is returned.
+ */
+ public boolean performItemClick(View view, int position, long id) {
+ if (mOnItemClickListener != null) {
+ playSoundEffect(SoundEffectConstants.CLICK);
+ if (view != null) {
+ view.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
+ }
+ mOnItemClickListener.onItemClick(/*this*/null, view, position, id);
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when an item in this
+ * view has been clicked and held.
+ */
+ public interface OnItemLongClickListener {
+ /**
+ * Callback method to be invoked when an item in this view has been
+ * clicked and held.
+ *
+ * Implementers can call getItemAtPosition(position) if they need to access
+ * the data associated with the selected item.
+ *
+ * @param parent The AbsListView where the click happened
+ * @param view The view within the AbsListView that was clicked
+ * @param position The position of the view in the list
+ * @param id The row id of the item that was clicked
+ *
+ * @return true if the callback consumed the long click, false otherwise
+ */
+ boolean onItemLongClick(IcsAdapterView<?> parent, View view, int position, long id);
+ }
+
+
+ /**
+ * Register a callback to be invoked when an item in this AdapterView has
+ * been clicked and held
+ *
+ * @param listener The callback that will run
+ */
+ public void setOnItemLongClickListener(OnItemLongClickListener listener) {
+ if (!isLongClickable()) {
+ setLongClickable(true);
+ }
+ mOnItemLongClickListener = listener;
+ }
+
+ /**
+ * @return The callback to be invoked with an item in this AdapterView has
+ * been clicked and held, or null id no callback as been set.
+ */
+ public final OnItemLongClickListener getOnItemLongClickListener() {
+ return mOnItemLongClickListener;
+ }
+
+ /**
+ * Interface definition for a callback to be invoked when
+ * an item in this view has been selected.
+ */
+ public interface OnItemSelectedListener {
+ /**
+ * <p>Callback method to be invoked when an item in this view has been
+ * selected. This callback is invoked only when the newly selected
+ * position is different from the previously selected position or if
+ * there was no selected item.</p>
+ *
+ * Impelmenters can call getItemAtPosition(position) if they need to access the
+ * data associated with the selected item.
+ *
+ * @param parent The AdapterView where the selection happened
+ * @param view The view within the AdapterView that was clicked
+ * @param position The position of the view in the adapter
+ * @param id The row id of the item that is selected
+ */
+ void onItemSelected(IcsAdapterView<?> parent, View view, int position, long id);
+
+ /**
+ * Callback method to be invoked when the selection disappears from this
+ * view. The selection can disappear for instance when touch is activated
+ * or when the adapter becomes empty.
+ *
+ * @param parent The AdapterView that now contains no selected item.
+ */
+ void onNothingSelected(IcsAdapterView<?> parent);
+ }
+
+
+ /**
+ * Register a callback to be invoked when an item in this AdapterView has
+ * been selected.
+ *
+ * @param listener The callback that will run
+ */
+ public void setOnItemSelectedListener(OnItemSelectedListener listener) {
+ mOnItemSelectedListener = listener;
+ }
+
+ public final OnItemSelectedListener getOnItemSelectedListener() {
+ return mOnItemSelectedListener;
+ }
+
+ /**
+ * Extra menu information provided to the
+ * {@link android.view.View.OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo) }
+ * callback when a context menu is brought up for this AdapterView.
+ *
+ */
+ public static class AdapterContextMenuInfo implements ContextMenu.ContextMenuInfo {
+
+ public AdapterContextMenuInfo(View targetView, int position, long id) {
+ this.targetView = targetView;
+ this.position = position;
+ this.id = id;
+ }
+
+ /**
+ * The child view for which the context menu is being displayed. This
+ * will be one of the children of this AdapterView.
+ */
+ public View targetView;
+
+ /**
+ * The position in the adapter for which the context menu is being
+ * displayed.
+ */
+ public int position;
+
+ /**
+ * The row id of the item for which the context menu is being displayed.
+ */
+ public long id;
+ }
+
+ /**
+ * Returns the adapter currently associated with this widget.
+ *
+ * @return The adapter used to provide this view's content.
+ */
+ public abstract T getAdapter();
+
+ /**
+ * Sets the adapter that provides the data and the views to represent the data
+ * in this widget.
+ *
+ * @param adapter The adapter to use to create this view's content.
+ */
+ public abstract void setAdapter(T adapter);
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @param child Ignored.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void addView(View child) {
+ throw new UnsupportedOperationException("addView(View) is not supported in AdapterView");
+ }
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @param child Ignored.
+ * @param index Ignored.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void addView(View child, int index) {
+ throw new UnsupportedOperationException("addView(View, int) is not supported in AdapterView");
+ }
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @param child Ignored.
+ * @param params Ignored.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void addView(View child, LayoutParams params) {
+ throw new UnsupportedOperationException("addView(View, LayoutParams) "
+ + "is not supported in AdapterView");
+ }
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @param child Ignored.
+ * @param index Ignored.
+ * @param params Ignored.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void addView(View child, int index, LayoutParams params) {
+ throw new UnsupportedOperationException("addView(View, int, LayoutParams) "
+ + "is not supported in AdapterView");
+ }
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @param child Ignored.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void removeView(View child) {
+ throw new UnsupportedOperationException("removeView(View) is not supported in AdapterView");
+ }
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @param index Ignored.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void removeViewAt(int index) {
+ throw new UnsupportedOperationException("removeViewAt(int) is not supported in AdapterView");
+ }
+
+ /**
+ * This method is not supported and throws an UnsupportedOperationException when called.
+ *
+ * @throws UnsupportedOperationException Every time this method is invoked.
+ */
+ @Override
+ public void removeAllViews() {
+ throw new UnsupportedOperationException("removeAllViews() is not supported in AdapterView");
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+ mLayoutHeight = getHeight();
+ }
+
+ /**
+ * Return the position of the currently selected item within the adapter's data set
+ *
+ * @return int Position (starting at 0), or {@link #INVALID_POSITION} if there is nothing selected.
+ */
+ @ViewDebug.CapturedViewProperty
+ public int getSelectedItemPosition() {
+ return mNextSelectedPosition;
+ }
+
+ /**
+ * @return The id corresponding to the currently selected item, or {@link #INVALID_ROW_ID}
+ * if nothing is selected.
+ */
+ @ViewDebug.CapturedViewProperty
+ public long getSelectedItemId() {
+ return mNextSelectedRowId;
+ }
+
+ /**
+ * @return The view corresponding to the currently selected item, or null
+ * if nothing is selected
+ */
+ public abstract View getSelectedView();
+
+ /**
+ * @return The data corresponding to the currently selected item, or
+ * null if there is nothing selected.
+ */
+ public Object getSelectedItem() {
+ T adapter = getAdapter();
+ int selection = getSelectedItemPosition();
+ if (adapter != null && adapter.getCount() > 0 && selection >= 0) {
+ return adapter.getItem(selection);
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * @return The number of items owned by the Adapter associated with this
+ * AdapterView. (This is the number of data items, which may be
+ * larger than the number of visible views.)
+ */
+ @ViewDebug.CapturedViewProperty
+ public int getCount() {
+ return mItemCount;
+ }
+
+ /**
+ * Get the position within the adapter's data set for the view, where view is a an adapter item
+ * or a descendant of an adapter item.
+ *
+ * @param view an adapter item, or a descendant of an adapter item. This must be visible in this
+ * AdapterView at the time of the call.
+ * @return the position within the adapter's data set of the view, or {@link #INVALID_POSITION}
+ * if the view does not correspond to a list item (or it is not currently visible).
+ */
+ public int getPositionForView(View view) {
+ View listItem = view;
+ try {
+ View v;
+ while (!(v = (View) listItem.getParent()).equals(this)) {
+ listItem = v;
+ }
+ } catch (ClassCastException e) {
+ // We made it up to the window without find this list view
+ return INVALID_POSITION;
+ }
+
+ // Search the children for the list item
+ final int childCount = getChildCount();
+ for (int i = 0; i < childCount; i++) {
+ if (getChildAt(i).equals(listItem)) {
+ return mFirstPosition + i;
+ }
+ }
+
+ // Child not found!
+ return INVALID_POSITION;
+ }
+
+ /**
+ * Returns the position within the adapter's data set for the first item
+ * displayed on screen.
+ *
+ * @return The position within the adapter's data set
+ */
+ public int getFirstVisiblePosition() {
+ return mFirstPosition;
+ }
+
+ /**
+ * Returns the position within the adapter's data set for the last item
+ * displayed on screen.
+ *
+ * @return The position within the adapter's data set
+ */
+ public int getLastVisiblePosition() {
+ return mFirstPosition + getChildCount() - 1;
+ }
+
+ /**
+ * Sets the currently selected item. To support accessibility subclasses that
+ * override this method must invoke the overriden super method first.
+ *
+ * @param position Index (starting at 0) of the data item to be selected.
+ */
+ public abstract void setSelection(int position);
+
+ /**
+ * Sets the view to show if the adapter is empty
+ */
+ public void setEmptyView(View emptyView) {
+ mEmptyView = emptyView;
+
+ final T adapter = getAdapter();
+ final boolean empty = ((adapter == null) || adapter.isEmpty());
+ updateEmptyStatus(empty);
+ }
+
+ /**
+ * When the current adapter is empty, the AdapterView can display a special view
+ * call the empty view. The empty view is used to provide feedback to the user
+ * that no data is available in this AdapterView.
+ *
+ * @return The view to show if the adapter is empty.
+ */
+ public View getEmptyView() {
+ return mEmptyView;
+ }
+
+ /**
+ * Indicates whether this view is in filter mode. Filter mode can for instance
+ * be enabled by a user when typing on the keyboard.
+ *
+ * @return True if the view is in filter mode, false otherwise.
+ */
+ boolean isInFilterMode() {
+ return false;
+ }
+
+ @Override
+ public void setFocusable(boolean focusable) {
+ final T adapter = getAdapter();
+ final boolean empty = adapter == null || adapter.getCount() == 0;
+
+ mDesiredFocusableState = focusable;
+ if (!focusable) {
+ mDesiredFocusableInTouchModeState = false;
+ }
+
+ super.setFocusable(focusable && (!empty || isInFilterMode()));
+ }
+
+ @Override
+ public void setFocusableInTouchMode(boolean focusable) {
+ final T adapter = getAdapter();
+ final boolean empty = adapter == null || adapter.getCount() == 0;
+
+ mDesiredFocusableInTouchModeState = focusable;
+ if (focusable) {
+ mDesiredFocusableState = true;
+ }
+
+ super.setFocusableInTouchMode(focusable && (!empty || isInFilterMode()));
+ }
+
+ void checkFocus() {
+ final T adapter = getAdapter();
+ final boolean empty = adapter == null || adapter.getCount() == 0;
+ final boolean focusable = !empty || isInFilterMode();
+ // The order in which we set focusable in touch mode/focusable may matter
+ // for the client, see View.setFocusableInTouchMode() comments for more
+ // details
+ super.setFocusableInTouchMode(focusable && mDesiredFocusableInTouchModeState);
+ super.setFocusable(focusable && mDesiredFocusableState);
+ if (mEmptyView != null) {
+ updateEmptyStatus((adapter == null) || adapter.isEmpty());
+ }
+ }
+
+ /**
+ * Update the status of the list based on the empty parameter. If empty is true and
+ * we have an empty view, display it. In all the other cases, make sure that the listview
+ * is VISIBLE and that the empty view is GONE (if it's not null).
+ */
+ private void updateEmptyStatus(boolean empty) {
+ if (isInFilterMode()) {
+ empty = false;
+ }
+
+ if (empty) {
+ if (mEmptyView != null) {
+ mEmptyView.setVisibility(View.VISIBLE);
+ setVisibility(View.GONE);
+ } else {
+ // If the caller just removed our empty view, make sure the list view is visible
+ setVisibility(View.VISIBLE);
+ }
+
+ // We are now GONE, so pending layouts will not be dispatched.
+ // Force one here to make sure that the state of the list matches
+ // the state of the adapter.
+ if (mDataChanged) {
+ this.onLayout(false, getLeft(), getTop(), getRight(), getBottom());
+ }
+ } else {
+ if (mEmptyView != null) mEmptyView.setVisibility(View.GONE);
+ setVisibility(View.VISIBLE);
+ }
+ }
+
+ /**
+ * Gets the data associated with the specified position in the list.
+ *
+ * @param position Which data to get
+ * @return The data associated with the specified position in the list
+ */
+ public Object getItemAtPosition(int position) {
+ T adapter = getAdapter();
+ return (adapter == null || position < 0) ? null : adapter.getItem(position);
+ }
+
+ public long getItemIdAtPosition(int position) {
+ T adapter = getAdapter();
+ return (adapter == null || position < 0) ? INVALID_ROW_ID : adapter.getItemId(position);
+ }
+
+ @Override
+ public void setOnClickListener(OnClickListener l) {
+ throw new RuntimeException("Don't call setOnClickListener for an AdapterView. "
+ + "You probably want setOnItemClickListener instead");
+ }
+
+ /**
+ * Override to prevent freezing of any views created by the adapter.
+ */
+ @Override
+ protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
+ dispatchFreezeSelfOnly(container);
+ }
+
+ /**
+ * Override to prevent thawing of any views created by the adapter.
+ */
+ @Override
+ protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
+ dispatchThawSelfOnly(container);
+ }
+
+ class AdapterDataSetObserver extends DataSetObserver {
+
+ private Parcelable mInstanceState = null;
+
+ @Override
+ public void onChanged() {
+ mDataChanged = true;
+ mOldItemCount = mItemCount;
+ mItemCount = getAdapter().getCount();
+
+ // Detect the case where a cursor that was previously invalidated has
+ // been repopulated with new data.
+ if (IcsAdapterView.this.getAdapter().hasStableIds() && mInstanceState != null
+ && mOldItemCount == 0 && mItemCount > 0) {
+ IcsAdapterView.this.onRestoreInstanceState(mInstanceState);
+ mInstanceState = null;
+ } else {
+ rememberSyncState();
+ }
+ checkFocus();
+ requestLayout();
+ }
+
+ @Override
+ public void onInvalidated() {
+ mDataChanged = true;
+
+ if (IcsAdapterView.this.getAdapter().hasStableIds()) {
+ // Remember the current state for the case where our hosting activity is being
+ // stopped and later restarted
+ mInstanceState = IcsAdapterView.this.onSaveInstanceState();
+ }
+
+ // Data is invalid so we should reset our state
+ mOldItemCount = mItemCount;
+ mItemCount = 0;
+ mSelectedPosition = INVALID_POSITION;
+ mSelectedRowId = INVALID_ROW_ID;
+ mNextSelectedPosition = INVALID_POSITION;
+ mNextSelectedRowId = INVALID_ROW_ID;
+ mNeedSync = false;
+
+ checkFocus();
+ requestLayout();
+ }
+
+ public void clearSavedState() {
+ mInstanceState = null;
+ }
+ }
+
+ @Override
+ protected void onDetachedFromWindow() {
+ super.onDetachedFromWindow();
+ removeCallbacks(mSelectionNotifier);
+ }
+
+ private class SelectionNotifier implements Runnable {
+ public void run() {
+ if (mDataChanged) {
+ // Data has changed between when this SelectionNotifier
+ // was posted and now. We need to wait until the AdapterView
+ // has been synched to the new data.
+ if (getAdapter() != null) {
+ post(this);
+ }
+ } else {
+ fireOnSelected();
+ }
+ }
+ }
+
+ void selectionChanged() {
+ if (mOnItemSelectedListener != null) {
+ if (mInLayout || mBlockLayoutRequests) {
+ // If we are in a layout traversal, defer notification
+ // by posting. This ensures that the view tree is
+ // in a consistent state and is able to accomodate
+ // new layout or invalidate requests.
+ if (mSelectionNotifier == null) {
+ mSelectionNotifier = new SelectionNotifier();
+ }
+ post(mSelectionNotifier);
+ } else {
+ fireOnSelected();
+ }
+ }
+
+ // we fire selection events here not in View
+ if (mSelectedPosition != ListView.INVALID_POSITION && isShown() && !isInTouchMode()) {
+ sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
+ }
+ }
+
+ private void fireOnSelected() {
+ if (mOnItemSelectedListener == null)
+ return;
+
+ int selection = this.getSelectedItemPosition();
+ if (selection >= 0) {
+ View v = getSelectedView();
+ mOnItemSelectedListener.onItemSelected(this, v, selection,
+ getAdapter().getItemId(selection));
+ } else {
+ mOnItemSelectedListener.onNothingSelected(this);
+ }
+ }
+
+ @Override
+ public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
+ View selectedView = getSelectedView();
+ if (selectedView != null && selectedView.getVisibility() == VISIBLE
+ && selectedView.dispatchPopulateAccessibilityEvent(event)) {
+ return true;
+ }
+ return false;
+ }
+
+ @Override
+ public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) {
+ if (super.onRequestSendAccessibilityEvent(child, event)) {
+ // Add a record for ourselves as well.
+ AccessibilityEvent record = AccessibilityEvent.obtain();
+ onInitializeAccessibilityEvent(record);
+ // Populate with the text of the requesting child.
+ child.dispatchPopulateAccessibilityEvent(record);
+ event.appendRecord(record);
+ return true;
+ }
+ return false;
+ }
+
+ @Override
+ public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
+ super.onInitializeAccessibilityNodeInfo(info);
+ info.setScrollable(isScrollableForAccessibility());
+ View selectedView = getSelectedView();
+ if (selectedView != null) {
+ info.setEnabled(selectedView.isEnabled());
+ }
+ }
+
+ @Override
+ public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
+ super.onInitializeAccessibilityEvent(event);
+ event.setScrollable(isScrollableForAccessibility());
+ View selectedView = getSelectedView();
+ if (selectedView != null) {
+ event.setEnabled(selectedView.isEnabled());
+ }
+ event.setCurrentItemIndex(getSelectedItemPosition());
+ event.setFromIndex(getFirstVisiblePosition());
+ event.setToIndex(getLastVisiblePosition());
+ event.setItemCount(getCount());
+ }
+
+ private boolean isScrollableForAccessibility() {
+ T adapter = getAdapter();
+ if (adapter != null) {
+ final int itemCount = adapter.getCount();
+ return itemCount > 0
+ && (getFirstVisiblePosition() > 0 || getLastVisiblePosition() < itemCount - 1);
+ }
+ return false;
+ }
+
+ @Override
+ protected boolean canAnimate() {
+ return super.canAnimate() && mItemCount > 0;
+ }
+
+ void handleDataChanged() {
+ final int count = mItemCount;
+ boolean found = false;
+
+ if (count > 0) {
+
+ int newPos;
+
+ // Find the row we are supposed to sync to
+ if (mNeedSync) {
+ // Update this first, since setNextSelectedPositionInt inspects
+ // it
+ mNeedSync = false;
+
+ // See if we can find a position in the new data with the same
+ // id as the old selection
+ newPos = findSyncPosition();
+ if (newPos >= 0) {
+ // Verify that new selection is selectable
+ int selectablePos = lookForSelectablePosition(newPos, true);
+ if (selectablePos == newPos) {
+ // Same row id is selected
+ setNextSelectedPositionInt(newPos);
+ found = true;
+ }
+ }
+ }
+ if (!found) {
+ // Try to use the same position if we can't find matching data
+ newPos = getSelectedItemPosition();
+
+ // Pin position to the available range
+ if (newPos >= count) {
+ newPos = count - 1;
+ }
+ if (newPos < 0) {
+ newPos = 0;
+ }
+
+ // Make sure we select something selectable -- first look down
+ int selectablePos = lookForSelectablePosition(newPos, true);
+ if (selectablePos < 0) {
+ // Looking down didn't work -- try looking up
+ selectablePos = lookForSelectablePosition(newPos, false);
+ }
+ if (selectablePos >= 0) {
+ setNextSelectedPositionInt(selectablePos);
+ checkSelectionChanged();
+ found = true;
+ }
+ }
+ }
+ if (!found) {
+ // Nothing is selected
+ mSelectedPosition = INVALID_POSITION;
+ mSelectedRowId = INVALID_ROW_ID;
+ mNextSelectedPosition = INVALID_POSITION;
+ mNextSelectedRowId = INVALID_ROW_ID;
+ mNeedSync = false;
+ checkSelectionChanged();
+ }
+ }
+
+ void checkSelectionChanged() {
+ if ((mSelectedPosition != mOldSelectedPosition) || (mSelectedRowId != mOldSelectedRowId)) {
+ selectionChanged();
+ mOldSelectedPosition = mSelectedPosition;
+ mOldSelectedRowId = mSelectedRowId;
+ }
+ }
+
+ /**
+ * Searches the adapter for a position matching mSyncRowId. The search starts at mSyncPosition
+ * and then alternates between moving up and moving down until 1) we find the right position, or
+ * 2) we run out of time, or 3) we have looked at every position
+ *
+ * @return Position of the row that matches mSyncRowId, or {@link #INVALID_POSITION} if it can't
+ * be found
+ */
+ int findSyncPosition() {
+ int count = mItemCount;
+
+ if (count == 0) {
+ return INVALID_POSITION;
+ }
+
+ long idToMatch = mSyncRowId;
+ int seed = mSyncPosition;
+
+ // If there isn't a selection don't hunt for it
+ if (idToMatch == INVALID_ROW_ID) {
+ return INVALID_POSITION;
+ }
+
+ // Pin seed to reasonable values
+ seed = Math.max(0, seed);
+ seed = Math.min(count - 1, seed);
+
+ long endTime = SystemClock.uptimeMillis() + SYNC_MAX_DURATION_MILLIS;
+
+ long rowId;
+
+ // first position scanned so far
+ int first = seed;
+
+ // last position scanned so far
+ int last = seed;
+
+ // True if we should move down on the next iteration
+ boolean next = false;
+
+ // True when we have looked at the first item in the data
+ boolean hitFirst;
+
+ // True when we have looked at the last item in the data
+ boolean hitLast;
+
+ // Get the item ID locally (instead of getItemIdAtPosition), so
+ // we need the adapter
+ T adapter = getAdapter();
+ if (adapter == null) {
+ return INVALID_POSITION;
+ }
+
+ while (SystemClock.uptimeMillis() <= endTime) {
+ rowId = adapter.getItemId(seed);
+ if (rowId == idToMatch) {
+ // Found it!
+ return seed;
+ }
+
+ hitLast = last == count - 1;
+ hitFirst = first == 0;
+
+ if (hitLast && hitFirst) {
+ // Looked at everything
+ break;
+ }
+
+ if (hitFirst || (next && !hitLast)) {
+ // Either we hit the top, or we are trying to move down
+ last++;
+ seed = last;
+ // Try going up next time
+ next = false;
+ } else if (hitLast || (!next && !hitFirst)) {
+ // Either we hit the bottom, or we are trying to move up
+ first--;
+ seed = first;
+ // Try going down next time
+ next = true;
+ }
+
+ }
+
+ return INVALID_POSITION;
+ }
+
+ /**
+ * Find a position that can be selected (i.e., is not a separator).
+ *
+ * @param position The starting position to look at.
+ * @param lookDown Whether to look down for other positions.
+ * @return The next selectable position starting at position and then searching either up or
+ * down. Returns {@link #INVALID_POSITION} if nothing can be found.
+ */
+ int lookForSelectablePosition(int position, boolean lookDown) {
+ return position;
+ }
+
+ /**
+ * Utility to keep mSelectedPosition and mSelectedRowId in sync
+ * @param position Our current position
+ */
+ void setSelectedPositionInt(int position) {
+ mSelectedPosition = position;
+ mSelectedRowId = getItemIdAtPosition(position);
+ }
+
+ /**
+ * Utility to keep mNextSelectedPosition and mNextSelectedRowId in sync
+ * @param position Intended value for mSelectedPosition the next time we go
+ * through layout
+ */
+ void setNextSelectedPositionInt(int position) {
+ mNextSelectedPosition = position;
+ mNextSelectedRowId = getItemIdAtPosition(position);
+ // If we are trying to sync to the selection, update that too
+ if (mNeedSync && mSyncMode == SYNC_SELECTED_POSITION && position >= 0) {
+ mSyncPosition = position;
+ mSyncRowId = mNextSelectedRowId;
+ }
+ }
+
+ /**
+ * Remember enough information to restore the screen state when the data has
+ * changed.
+ *
+ */
+ void rememberSyncState() {
+ if (getChildCount() > 0) {
+ mNeedSync = true;
+ mSyncHeight = mLayoutHeight;
+ if (mSelectedPosition >= 0) {
+ // Sync the selection state
+ View v = getChildAt(mSelectedPosition - mFirstPosition);
+ mSyncRowId = mNextSelectedRowId;
+ mSyncPosition = mNextSelectedPosition;
+ if (v != null) {
+ mSpecificTop = v.getTop();
+ }
+ mSyncMode = SYNC_SELECTED_POSITION;
+ } else {
+ // Sync the based on the offset of the first view
+ View v = getChildAt(0);
+ T adapter = getAdapter();
+ if (mFirstPosition >= 0 && mFirstPosition < adapter.getCount()) {
+ mSyncRowId = adapter.getItemId(mFirstPosition);
+ } else {
+ mSyncRowId = NO_ID;
+ }
+ mSyncPosition = mFirstPosition;
+ if (v != null) {
+ mSpecificTop = v.getTop();
+ }
+ mSyncMode = SYNC_FIRST_POSITION;
+ }
+ }
+ }
+}
projects / debian / openrocket / blobdiff