diff options
Diffstat (limited to 'src/com/cyanogenmod/trebuchet/widget/CustomAbsSpinner.java')
| -rw-r--r-- | src/com/cyanogenmod/trebuchet/widget/CustomAbsSpinner.java | 507 |
1 files changed, 507 insertions, 0 deletions
diff --git a/src/com/cyanogenmod/trebuchet/widget/CustomAbsSpinner.java b/src/com/cyanogenmod/trebuchet/widget/CustomAbsSpinner.java new file mode 100644 index 00000000..7861f50b --- /dev/null +++ b/src/com/cyanogenmod/trebuchet/widget/CustomAbsSpinner.java @@ -0,0 +1,507 @@ +/* + * Copyright (C) 2013 The CyanogenMod Project + * Copyright (C) 2013 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.cyanogenmod.trebuchet.widget; + +import android.content.Context; +import android.content.res.TypedArray; +import android.database.DataSetObserver; +import android.graphics.Rect; +import android.os.Parcel; +import android.os.Parcelable; +import android.util.AttributeSet; +import android.util.SparseArray; +import android.view.View; +import android.view.ViewGroup; +import android.view.animation.Interpolator; +import android.widget.ArrayAdapter; +import android.widget.SpinnerAdapter; +import com.cyanogenmod.trebuchet.R; + +public abstract class CustomAbsSpinner extends CustomAdapterView<SpinnerAdapter> { + + SpinnerAdapter mAdapter; + + int mHeightMeasureSpec; + int mWidthMeasureSpec; + boolean mBlockLayoutRequests; + int mSelectionLeftPadding = 0; + int mSelectionTopPadding = 0; + int mSelectionRightPadding = 0; + int mSelectionBottomPadding = 0; + Rect mSpinnerPadding = new Rect(); + View mSelectedView = null; + Interpolator mInterpolator; + + RecycleBin mRecycler = new RecycleBin(); + private DataSetObserver mDataSetObserver; + + + /** Temporary frame to hold a child View's frame rectangle */ + private Rect mTouchFrame; + + public CustomAbsSpinner(Context context) { + super(context); + initAbsSpinner(); + } + + public CustomAbsSpinner(Context context, AttributeSet attrs) { + this(context, attrs, 0); + } + + public CustomAbsSpinner(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + initAbsSpinner(); + + TypedArray a = context.obtainStyledAttributes(attrs, + R.styleable.CustomAbsSpinner, defStyle, 0); + + CharSequence[] entries = a.getTextArray(R.styleable.CustomAbsSpinner_entries); + if (entries != null) { + ArrayAdapter<CharSequence> adapter = + new ArrayAdapter<CharSequence>(context, + android.R.layout.simple_spinner_item, entries); + adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); + setAdapter(adapter); + } + + a.recycle(); + } + + /** + * Common code for different constructor flavors + */ + private void initAbsSpinner() { + setFocusable(true); + setWillNotDraw(false); + } + + + /** + * The Adapter is used to provide the data which backs this Spinner. + * It also provides methods to transform spinner items based on their position + * relative to the selected item. + * @param adapter The SpinnerAdapter to use for this Spinner + */ + @Override + public void setAdapter(SpinnerAdapter adapter) { + if (null != mAdapter) { + mAdapter.unregisterDataSetObserver(mDataSetObserver); + resetList(); + } + + mAdapter = adapter; + + mOldSelectedPosition = INVALID_POSITION; + mOldSelectedRowId = INVALID_ROW_ID; + + if (mAdapter != null) { + mOldItemCount = mItemCount; + mItemCount = mAdapter.getCount(); + checkFocus(); + + mDataSetObserver = new AdapterDataSetObserver(); + mAdapter.registerDataSetObserver(mDataSetObserver); + + int position = mItemCount > 0 ? 0 : INVALID_POSITION; + + setSelectedPositionInt(position); + setNextSelectedPositionInt(position); + + if (mItemCount == 0) { + // Nothing selected + checkSelectionChanged(); + } + + } else { + checkFocus(); + resetList(); + // Nothing selected + checkSelectionChanged(); + } + + requestLayout(); + } + + /** + * Clear out all children from the list + */ + void resetList() { + mDataChanged = false; + mNeedSync = false; + + removeAllViewsInLayout(); + mOldSelectedPosition = INVALID_POSITION; + mOldSelectedRowId = INVALID_ROW_ID; + + setSelectedPositionInt(INVALID_POSITION); + setNextSelectedPositionInt(INVALID_POSITION); + invalidate(); + } + + /** + * @see android.view.View#measure(int, int) + * + * Figure out the dimensions of this Spinner. The width comes from + * the widthMeasureSpec as Spinnners can't have their width set to + * UNSPECIFIED. The height is based on the height of the selected item + * plus padding. + */ + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { + int widthMode = MeasureSpec.getMode(widthMeasureSpec); + int widthSize; + int heightSize; + + int paddingLeft = getPaddingLeft(); + int paddingRight = getPaddingRight(); + int paddingTop = getPaddingTop(); + int paddingBottom = getPaddingBottom(); + + mSpinnerPadding.left = paddingLeft > mSelectionLeftPadding ? paddingLeft + : mSelectionLeftPadding; + mSpinnerPadding.top = paddingTop > mSelectionTopPadding ? paddingTop + : mSelectionTopPadding; + mSpinnerPadding.right = paddingRight > mSelectionRightPadding ? paddingRight + : mSelectionRightPadding; + mSpinnerPadding.bottom = paddingBottom > mSelectionBottomPadding ? paddingBottom + : mSelectionBottomPadding; + + if (mDataChanged) { + handleDataChanged(); + } + + int preferredHeight = 0; + int preferredWidth = 0; + boolean needsMeasuring = true; + + int selectedPosition = getSelectedItemPosition(); + if (selectedPosition >= 0 && mAdapter != null) { + // Try looking in the recycler. (Maybe we were measured once already) + View view = mRecycler.get(); + if (view == null) { + // Make a new one + view = mAdapter.getView(selectedPosition, null, this); + } + + if (view != null) { + // Put in recycler for re-measuring and/or layout + mRecycler.add(selectedPosition, view); + } + + if (view != null) { + if (view.getLayoutParams() == null) { + mBlockLayoutRequests = true; + view.setLayoutParams(generateDefaultLayoutParams()); + mBlockLayoutRequests = false; + } + measureChild(view, widthMeasureSpec, heightMeasureSpec); + + preferredHeight = getChildHeight(view) + mSpinnerPadding.top + mSpinnerPadding.bottom; + preferredWidth = getChildWidth(view) + mSpinnerPadding.left + mSpinnerPadding.right; + + needsMeasuring = false; + } + } + + if (needsMeasuring) { + // No views -- just use padding + preferredHeight = mSpinnerPadding.top + mSpinnerPadding.bottom; + if (widthMode == MeasureSpec.UNSPECIFIED) { + preferredWidth = mSpinnerPadding.left + mSpinnerPadding.right; + } + } + + preferredHeight = Math.max(preferredHeight, getSuggestedMinimumHeight()); + preferredWidth = Math.max(preferredWidth, getSuggestedMinimumWidth()); + + heightSize = resolveSize(preferredHeight, heightMeasureSpec); + widthSize = resolveSize(preferredWidth, widthMeasureSpec); + + setMeasuredDimension(widthSize, heightSize); + mHeightMeasureSpec = heightMeasureSpec; + mWidthMeasureSpec = widthMeasureSpec; + } + + + int getChildHeight(View child) { + return child.getMeasuredHeight(); + } + + int getChildWidth(View child) { + return child.getMeasuredWidth(); + } + + @Override + protected ViewGroup.LayoutParams generateDefaultLayoutParams() { + return new ViewGroup.LayoutParams( + ViewGroup.LayoutParams.FILL_PARENT, + ViewGroup.LayoutParams.WRAP_CONTENT); + } + + void recycleAllViews() { + int childCount = getChildCount(); + final CustomAbsSpinner.RecycleBin recycleBin = mRecycler; + + // All views go in recycler + for (int i=0; i<childCount; i++) { + View v = getChildAt(i); + int index = mFirstPosition + i; + recycleBin.put(index, v); + } + } + + @Override + void handleDataChanged() { + // FIXME -- this is called from both measure and layout. + // This is harmless right now, but we don't want to do redundant work if + // this gets more complicated + super.handleDataChanged(); + } + + + + /** + * Jump directly to a specific item in the adapter data. + */ + public void setSelection(int position, boolean animate) { + // Animate only if requested position is already on screen somewhere + boolean shouldAnimate = animate && mFirstPosition <= position && + position <= mFirstPosition + getChildCount() - 1; + setSelectionInt(position, shouldAnimate); + } + + + @Override + public void setSelection(int position) { + setNextSelectedPositionInt(position); + requestLayout(); + invalidate(); + } + + + /** + * Makes the item at the supplied position selected. + * + * @param position Position to select + * @param animate Should the transition be animated + * + */ + void setSelectionInt(int position, boolean animate) { + if (position != mOldSelectedPosition) { + mBlockLayoutRequests = true; + int delta = position - mSelectedPosition; + setNextSelectedPositionInt(position); + layout(delta, animate); + mBlockLayoutRequests = false; + } + } + + abstract void layout(int delta, boolean animate); + + @Override + public View getSelectedView() { + if (mItemCount > 0 && mSelectedPosition >= 0) { + return getChildAt(mSelectedPosition - mFirstPosition); + } else { + return null; + } + } + + /** + * Override to prevent spamming ourselves with layout requests + * as we place views + * + * @see android.view.View#requestLayout() + */ + @Override + public void requestLayout() { + if (!mBlockLayoutRequests) { + super.requestLayout(); + } + } + + + + @Override + public SpinnerAdapter getAdapter() { + return mAdapter; + } + + @Override + public int getCount() { + return mItemCount; + } + + /** + * Maps a point to a position in the list. + * + * @param x X in local coordinate + * @param y Y in local coordinate + * @return The position of the item which contains the specified point, or + * {@link #INVALID_POSITION} if the point does not intersect an item. + */ + public int pointToPosition(int x, int y) { + Rect frame = mTouchFrame; + if (frame == null) { + mTouchFrame = new Rect(); + frame = mTouchFrame; + } + + final int count = getChildCount(); + for (int i = count - 1; i >= 0; i--) { + View child = getChildAt(i); + if (child.getVisibility() == View.VISIBLE) { + child.getHitRect(frame); + if (frame.contains(x, y)) { + return mFirstPosition + i; + } + } + } + return INVALID_POSITION; + } + + static class SavedState extends BaseSavedState { + long selectedId; + int position; + + /** + * Constructor called from {@link CustomAbsSpinner#onSaveInstanceState()} + */ + SavedState(Parcelable superState) { + super(superState); + } + + /** + * Constructor called from {@link #CREATOR} + */ + private SavedState(Parcel in) { + super(in); + selectedId = in.readLong(); + position = in.readInt(); + } + + @Override + public void writeToParcel(Parcel out, int flags) { + super.writeToParcel(out, flags); + out.writeLong(selectedId); + out.writeInt(position); + } + + @Override + public String toString() { + return "AbsSpinner.SavedState{" + + Integer.toHexString(System.identityHashCode(this)) + + " selectedId=" + selectedId + + " position=" + position + "}"; + } + + public static final Parcelable.Creator<SavedState> CREATOR + = new Parcelable.Creator<SavedState>() { + public SavedState createFromParcel(Parcel in) { + return new SavedState(in); + } + + public SavedState[] newArray(int size) { + return new SavedState[size]; + } + }; + } + + @Override + public Parcelable onSaveInstanceState() { + Parcelable superState = super.onSaveInstanceState(); + SavedState ss = new SavedState(superState); + ss.selectedId = getSelectedItemId(); + if (ss.selectedId >= 0) { + ss.position = getSelectedItemPosition(); + } else { + ss.position = INVALID_POSITION; + } + return ss; + } + + @Override + public void onRestoreInstanceState(Parcelable state) { + SavedState ss = (SavedState) state; + + super.onRestoreInstanceState(ss.getSuperState()); + + if (ss.selectedId >= 0) { + mDataChanged = true; + mNeedSync = true; + mSyncRowId = ss.selectedId; + mSyncPosition = ss.position; + mSyncMode = SYNC_SELECTED_POSITION; + requestLayout(); + } + } + + class RecycleBin { + private SparseArray<View> mScrapHeap = new SparseArray<View>(); + + public void put(int position, View v) { + mScrapHeap.put(position, v); + } + + public void add(int position, View v) { + mScrapHeap.put(mScrapHeap.size(), v); + } + public View get() { + if (mScrapHeap.size() < 1) return null; + + View result = mScrapHeap.valueAt(0); + int key = mScrapHeap.keyAt(0); + + if (result != null) { + mScrapHeap.delete(key); + } + return result; + } + + View get(int position) { + // System.out.print("Looking for " + position); + View result = mScrapHeap.get(position); + if (result != null) { + // System.out.println(" HIT"); + mScrapHeap.delete(position); + } else { + // System.out.println(" MISS"); + } + return result; + } + + View peek(int position) { + // System.out.print("Looking for " + position); + return mScrapHeap.get(position); + } + + void clear() { + final SparseArray<View> scrapHeap = mScrapHeap; + + final int count = scrapHeap.size(); + for (int i = 0; i < count; i++) { + final View view = scrapHeap.valueAt(i); + if (view != null) { + removeDetachedView(view, true); + } + } + + scrapHeap.clear(); + } + } +} |