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Diffstat (limited to 'src/com/android/launcher3/widget/WidgetsRecyclerView.java')
| -rw-r--r-- | src/com/android/launcher3/widget/WidgetsRecyclerView.java | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/com/android/launcher3/widget/WidgetsRecyclerView.java b/src/com/android/launcher3/widget/WidgetsRecyclerView.java new file mode 100644 index 000000000..884bdc418 --- /dev/null +++ b/src/com/android/launcher3/widget/WidgetsRecyclerView.java @@ -0,0 +1,168 @@ +/* + * Copyright (C) 2015 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.android.launcher3.widget; + +import android.content.Context; +import android.graphics.Canvas; +import android.graphics.Color; +import android.support.v7.widget.LinearLayoutManager; +import android.util.AttributeSet; +import android.view.View; +import com.android.launcher3.BaseRecyclerView; +import com.android.launcher3.R; +import com.android.launcher3.model.PackageItemInfo; +import com.android.launcher3.model.WidgetsModel; + +/** + * The widgets recycler view. + */ +public class WidgetsRecyclerView extends BaseRecyclerView { + + private static final String TAG = "WidgetsRecyclerView"; + private WidgetsModel mWidgets; + private ScrollPositionState mScrollPosState = new ScrollPositionState(); + + public WidgetsRecyclerView(Context context) { + this(context, null); + } + + public WidgetsRecyclerView(Context context, AttributeSet attrs) { + this(context, attrs, 0); + } + + public WidgetsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) { + // API 21 and below only support 3 parameter ctor. + super(context, attrs, defStyleAttr); + } + + public WidgetsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr, + int defStyleRes) { + this(context, attrs, defStyleAttr); + } + + @Override + protected void onFinishInflate() { + super.onFinishInflate(); + addOnItemTouchListener(this); + } + + public int getFastScrollerTrackColor(int defaultTrackColor) { + return Color.WHITE; + } + + /** + * Sets the widget model in this view, used to determine the fast scroll position. + */ + public void setWidgets(WidgetsModel widgets) { + mWidgets = widgets; + } + + /** + * We need to override the draw to ensure that we don't draw the overscroll effect beyond the + * background bounds. + */ + @Override + protected void dispatchDraw(Canvas canvas) { + canvas.clipRect(mBackgroundPadding.left, mBackgroundPadding.top, + getWidth() - mBackgroundPadding.right, + getHeight() - mBackgroundPadding.bottom); + super.dispatchDraw(canvas); + } + + /** + * Maps the touch (from 0..1) to the adapter position that should be visible. + */ + @Override + public String scrollToPositionAtProgress(float touchFraction) { + // Skip early if widgets are not bound. + if (mWidgets == null) { + return ""; + } + + // Skip early if there are no widgets. + int rowCount = mWidgets.getPackageSize(); + if (rowCount == 0) { + return ""; + } + + // Stop the scroller if it is scrolling + stopScroll(); + + getCurScrollState(mScrollPosState); + float pos = rowCount * touchFraction; + int availableScrollHeight = getAvailableScrollHeight(rowCount, mScrollPosState.rowHeight); + LinearLayoutManager layoutManager = ((LinearLayoutManager) getLayoutManager()); + layoutManager.scrollToPositionWithOffset(0, (int) -(availableScrollHeight * touchFraction)); + + int posInt = (int) ((touchFraction == 1)? pos -1 : pos); + PackageItemInfo p = mWidgets.getPackageItemInfo(posInt); + return p.titleSectionName; + } + + /** + * Updates the bounds for the scrollbar. + */ + @Override + public void onUpdateScrollbar(int dy) { + // Skip early if widgets are not bound. + if (mWidgets == null) { + return; + } + + // Skip early if there are no widgets. + int rowCount = mWidgets.getPackageSize(); + if (rowCount == 0) { + mScrollbar.setThumbOffset(-1, -1); + return; + } + + // Skip early if, there no child laid out in the container. + getCurScrollState(mScrollPosState); + if (mScrollPosState.rowIndex < 0) { + mScrollbar.setThumbOffset(-1, -1); + return; + } + + synchronizeScrollBarThumbOffsetToViewScroll(mScrollPosState, rowCount); + } + + /** + * Returns the current scroll state. + */ + protected void getCurScrollState(ScrollPositionState stateOut) { + stateOut.rowIndex = -1; + stateOut.rowTopOffset = -1; + stateOut.rowHeight = -1; + + // Skip early if widgets are not bound. + if (mWidgets == null) { + return; + } + + // Return early if there are no items + int rowCount = mWidgets.getPackageSize(); + if (rowCount == 0) { + return; + } + View child = getChildAt(0); + int position = getChildPosition(child); + + stateOut.rowIndex = position; + stateOut.rowTopOffset = getLayoutManager().getDecoratedTop(child); + stateOut.rowHeight = child.getHeight(); + } +}
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