| /* |
| * Copyright (C) 2007 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 android.widget; |
| |
| import android.annotation.Widget; |
| import android.app.AlertDialog; |
| import android.content.Context; |
| import android.content.DialogInterface; |
| import android.content.DialogInterface.OnClickListener; |
| import android.content.res.TypedArray; |
| import android.database.DataSetObserver; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| |
| /** |
| * A view that displays one child at a time and lets the user pick among them. |
| * The items in the Spinner come from the {@link Adapter} associated with |
| * this view. |
| * |
| * @attr ref android.R.styleable#Spinner_prompt |
| */ |
| @Widget |
| public class Spinner extends AbsSpinner implements OnClickListener { |
| |
| private CharSequence mPrompt; |
| private AlertDialog mPopup; |
| |
| public Spinner(Context context) { |
| this(context, null); |
| } |
| |
| public Spinner(Context context, AttributeSet attrs) { |
| this(context, attrs, com.android.internal.R.attr.spinnerStyle); |
| } |
| |
| public Spinner(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| TypedArray a = context.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.Spinner, defStyle, 0); |
| |
| mPrompt = a.getString(com.android.internal.R.styleable.Spinner_prompt); |
| |
| a.recycle(); |
| } |
| |
| @Override |
| public int getBaseline() { |
| View child = null; |
| |
| if (getChildCount() > 0) { |
| child = getChildAt(0); |
| } else if (mAdapter != null && mAdapter.getCount() > 0) { |
| child = makeAndAddView(0); |
| // TODO: We should probably put the child in the recycler |
| } |
| |
| if (child != null) { |
| return child.getTop() + child.getBaseline(); |
| } else { |
| return -1; |
| } |
| } |
| |
| @Override |
| protected void onDetachedFromWindow() { |
| super.onDetachedFromWindow(); |
| |
| if (mPopup != null && mPopup.isShowing()) { |
| mPopup.dismiss(); |
| mPopup = null; |
| } |
| } |
| |
| /** |
| * <p>A spinner does not support item click events. Calling this method |
| * will raise an exception.</p> |
| * |
| * @param l this listener will be ignored |
| */ |
| @Override |
| public void setOnItemClickListener(OnItemClickListener l) { |
| throw new RuntimeException("setOnItemClickListener cannot be used with a spinner."); |
| } |
| |
| /** |
| * @see android.view.View#onLayout(boolean,int,int,int,int) |
| * |
| * Creates and positions all views |
| * |
| */ |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| super.onLayout(changed, l, t, r, b); |
| mInLayout = true; |
| layout(0, false); |
| mInLayout = false; |
| } |
| |
| /** |
| * Creates and positions all views for this Spinner. |
| * |
| * @param delta Change in the selected position. +1 moves selection is moving to the right, |
| * so views are scrolling to the left. -1 means selection is moving to the left. |
| */ |
| @Override |
| void layout(int delta, boolean animate) { |
| int childrenLeft = mSpinnerPadding.left; |
| int childrenWidth = mRight - mLeft - mSpinnerPadding.left - mSpinnerPadding.right; |
| |
| if (mDataChanged) { |
| handleDataChanged(); |
| } |
| |
| // Handle the empty set by removing all views |
| if (mItemCount == 0) { |
| resetList(); |
| return; |
| } |
| |
| if (mNextSelectedPosition >= 0) { |
| setSelectedPositionInt(mNextSelectedPosition); |
| } |
| |
| recycleAllViews(); |
| |
| // Clear out old views |
| removeAllViewsInLayout(); |
| |
| // Make selected view and center it |
| mFirstPosition = mSelectedPosition; |
| View sel = makeAndAddView(mSelectedPosition); |
| int width = sel.getMeasuredWidth(); |
| int selectedOffset = childrenLeft + (childrenWidth / 2) - (width / 2); |
| sel.offsetLeftAndRight(selectedOffset); |
| |
| // Flush any cached views that did not get reused above |
| mRecycler.clear(); |
| |
| invalidate(); |
| |
| checkSelectionChanged(); |
| |
| mDataChanged = false; |
| mNeedSync = false; |
| setNextSelectedPositionInt(mSelectedPosition); |
| } |
| |
| /** |
| * Obtain a view, either by pulling an existing view from the recycler or |
| * by getting a new one from the adapter. If we are animating, make sure |
| * there is enough information in the view's layout parameters to animate |
| * from the old to new positions. |
| * |
| * @param position Position in the spinner for the view to obtain |
| * @return A view that has been added to the spinner |
| */ |
| private View makeAndAddView(int position) { |
| |
| View child; |
| |
| if (!mDataChanged) { |
| child = mRecycler.get(position); |
| if (child != null) { |
| // Position the view |
| setUpChild(child); |
| |
| return child; |
| } |
| } |
| |
| // Nothing found in the recycler -- ask the adapter for a view |
| child = mAdapter.getView(position, null, this); |
| |
| // Position the view |
| setUpChild(child); |
| |
| return child; |
| } |
| |
| |
| |
| /** |
| * Helper for makeAndAddView to set the position of a view |
| * and fill out its layout paramters. |
| * |
| * @param child The view to position |
| */ |
| private void setUpChild(View child) { |
| |
| // Respect layout params that are already in the view. Otherwise |
| // make some up... |
| ViewGroup.LayoutParams lp = child.getLayoutParams(); |
| if (lp == null) { |
| lp = generateDefaultLayoutParams(); |
| } |
| |
| addViewInLayout(child, 0, lp); |
| |
| child.setSelected(hasFocus()); |
| |
| // Get measure specs |
| int childHeightSpec = ViewGroup.getChildMeasureSpec(mHeightMeasureSpec, |
| mSpinnerPadding.top + mSpinnerPadding.bottom, lp.height); |
| int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, |
| mSpinnerPadding.left + mSpinnerPadding.right, lp.width); |
| |
| // Measure child |
| child.measure(childWidthSpec, childHeightSpec); |
| |
| int childLeft; |
| int childRight; |
| |
| // Position vertically based on gravity setting |
| int childTop = mSpinnerPadding.top |
| + ((mMeasuredHeight - mSpinnerPadding.bottom - |
| mSpinnerPadding.top - child.getMeasuredHeight()) / 2); |
| int childBottom = childTop + child.getMeasuredHeight(); |
| |
| int width = child.getMeasuredWidth(); |
| childLeft = 0; |
| childRight = childLeft + width; |
| |
| child.layout(childLeft, childTop, childRight, childBottom); |
| } |
| |
| @Override |
| public boolean performClick() { |
| boolean handled = super.performClick(); |
| |
| if (!handled) { |
| handled = true; |
| Context context = getContext(); |
| |
| final DropDownAdapter adapter = new DropDownAdapter(getAdapter()); |
| |
| AlertDialog.Builder builder = new AlertDialog.Builder(context); |
| if (mPrompt != null) { |
| builder.setTitle(mPrompt); |
| } |
| mPopup = builder.setSingleChoiceItems(adapter, getSelectedItemPosition(), this).show(); |
| } |
| |
| return handled; |
| } |
| |
| public void onClick(DialogInterface dialog, int which) { |
| setSelection(which); |
| dialog.dismiss(); |
| mPopup = null; |
| } |
| |
| /** |
| * Sets the prompt to display when the dialog is shown. |
| * @param prompt the prompt to set |
| */ |
| public void setPrompt(CharSequence prompt) { |
| mPrompt = prompt; |
| } |
| |
| /** |
| * Sets the prompt to display when the dialog is shown. |
| * @param promptId the resource ID of the prompt to display when the dialog is shown |
| */ |
| public void setPromptId(int promptId) { |
| mPrompt = getContext().getText(promptId); |
| } |
| |
| /** |
| * @return The prompt to display when the dialog is shown |
| */ |
| public CharSequence getPrompt() { |
| return mPrompt; |
| } |
| |
| /** |
| * <p>Wrapper class for an Adapter. Transforms the embedded Adapter instance |
| * into a ListAdapter.</p> |
| */ |
| private static class DropDownAdapter implements ListAdapter, SpinnerAdapter { |
| private SpinnerAdapter mAdapter; |
| private ListAdapter mListAdapter; |
| |
| /** |
| * <p>Creates a new ListAdapter wrapper for the specified adapter.</p> |
| * |
| * @param adapter the Adapter to transform into a ListAdapter |
| */ |
| public DropDownAdapter(SpinnerAdapter adapter) { |
| this.mAdapter = adapter; |
| if (adapter instanceof ListAdapter) { |
| this.mListAdapter = (ListAdapter) adapter; |
| } |
| } |
| |
| public int getCount() { |
| return mAdapter == null ? 0 : mAdapter.getCount(); |
| } |
| |
| public Object getItem(int position) { |
| return mAdapter == null ? null : mAdapter.getItem(position); |
| } |
| |
| public long getItemId(int position) { |
| return mAdapter == null ? -1 : mAdapter.getItemId(position); |
| } |
| |
| public View getView(int position, View convertView, ViewGroup parent) { |
| return getDropDownView(position, convertView, parent); |
| } |
| |
| public View getDropDownView(int position, View convertView, ViewGroup parent) { |
| return mAdapter == null ? null : |
| mAdapter.getDropDownView(position, convertView, parent); |
| } |
| |
| public boolean hasStableIds() { |
| return mAdapter != null && mAdapter.hasStableIds(); |
| } |
| |
| public void registerDataSetObserver(DataSetObserver observer) { |
| if (mAdapter != null) { |
| mAdapter.registerDataSetObserver(observer); |
| } |
| } |
| |
| public void unregisterDataSetObserver(DataSetObserver observer) { |
| if (mAdapter != null) { |
| mAdapter.unregisterDataSetObserver(observer); |
| } |
| } |
| |
| /** |
| * If the wrapped SpinnerAdapter is also a ListAdapter, delegate this call. |
| * Otherwise, return true. |
| */ |
| public boolean areAllItemsEnabled() { |
| final ListAdapter adapter = mListAdapter; |
| if (adapter != null) { |
| return adapter.areAllItemsEnabled(); |
| } else { |
| return true; |
| } |
| } |
| |
| /** |
| * If the wrapped SpinnerAdapter is also a ListAdapter, delegate this call. |
| * Otherwise, return true. |
| */ |
| public boolean isEnabled(int position) { |
| final ListAdapter adapter = mListAdapter; |
| if (adapter != null) { |
| return adapter.isEnabled(position); |
| } else { |
| return true; |
| } |
| } |
| |
| public int getItemViewType(int position) { |
| return 0; |
| } |
| |
| public int getViewTypeCount() { |
| return 1; |
| } |
| |
| public boolean isEmpty() { |
| return getCount() == 0; |
| } |
| } |
| } |