| /* |
| * Copyright (C) 2014 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.systemui.qs; |
| |
| import com.android.systemui.R; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.database.DataSetObserver; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.BaseAdapter; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * A view that arranges it's children in a grid with a fixed number of evenly spaced columns. |
| * |
| * {@see android.widget.GridView} |
| */ |
| public class PseudoGridView extends ViewGroup { |
| |
| private int mNumColumns = 3; |
| private int mVerticalSpacing; |
| private int mHorizontalSpacing; |
| |
| public PseudoGridView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| |
| final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PseudoGridView); |
| |
| final int N = a.getIndexCount(); |
| for (int i = 0; i < N; i++) { |
| int attr = a.getIndex(i); |
| switch (attr) { |
| case R.styleable.PseudoGridView_numColumns: |
| mNumColumns = a.getInt(attr, 3); |
| break; |
| case R.styleable.PseudoGridView_verticalSpacing: |
| mVerticalSpacing = a.getDimensionPixelSize(attr, 0); |
| break; |
| case R.styleable.PseudoGridView_horizontalSpacing: |
| mHorizontalSpacing = a.getDimensionPixelSize(attr, 0); |
| break; |
| } |
| } |
| |
| a.recycle(); |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| if (widthMode == MeasureSpec.UNSPECIFIED) { |
| throw new UnsupportedOperationException("Needs a maximum width"); |
| } |
| int width = MeasureSpec.getSize(widthMeasureSpec); |
| |
| int childWidth = (width - (mNumColumns - 1) * mHorizontalSpacing) / mNumColumns; |
| int childWidthSpec = MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY); |
| int childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| int totalHeight = 0; |
| int children = getChildCount(); |
| int rows = (children + mNumColumns - 1) / mNumColumns; |
| for (int row = 0; row < rows; row++) { |
| int startOfRow = row * mNumColumns; |
| int endOfRow = Math.min(startOfRow + mNumColumns, children); |
| int maxHeight = 0; |
| for (int i = startOfRow; i < endOfRow; i++) { |
| View child = getChildAt(i); |
| child.measure(childWidthSpec, childHeightSpec); |
| maxHeight = Math.max(maxHeight, child.getMeasuredHeight()); |
| } |
| int maxHeightSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.EXACTLY); |
| for (int i = startOfRow; i < endOfRow; i++) { |
| View child = getChildAt(i); |
| child.measure(childWidthSpec, maxHeightSpec); |
| } |
| totalHeight += maxHeight; |
| if (row > 0) { |
| totalHeight += mVerticalSpacing; |
| } |
| } |
| |
| setMeasuredDimension(width, getDefaultSize(totalHeight, heightMeasureSpec)); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| int children = getChildCount(); |
| int rows = (children + mNumColumns - 1) / mNumColumns; |
| int y = 0; |
| for (int row = 0; row < rows; row++) { |
| int x = 0; |
| int maxHeight = 0; |
| int startOfRow = row * mNumColumns; |
| int endOfRow = Math.min(startOfRow + mNumColumns, children); |
| for (int i = startOfRow; i < endOfRow; i++) { |
| View child = getChildAt(i); |
| int width = child.getMeasuredWidth(); |
| int height = child.getMeasuredHeight(); |
| child.layout(x, y, x + width, y + height); |
| maxHeight = Math.max(maxHeight, height); |
| x += width + mHorizontalSpacing; |
| } |
| y += maxHeight; |
| if (row > 0) { |
| y += mVerticalSpacing; |
| } |
| } |
| } |
| |
| /** |
| * Bridges between a ViewGroup and a BaseAdapter. |
| * <p> |
| * Usage: {@code ViewGroupAdapterBridge.link(viewGroup, adapter)} |
| * <br /> |
| * After this call, the ViewGroup's children will be provided by the adapter. |
| */ |
| public static class ViewGroupAdapterBridge extends DataSetObserver { |
| |
| private final WeakReference<ViewGroup> mViewGroup; |
| private final BaseAdapter mAdapter; |
| private boolean mReleased; |
| |
| public static void link(ViewGroup viewGroup, BaseAdapter adapter) { |
| new ViewGroupAdapterBridge(viewGroup, adapter); |
| } |
| |
| private ViewGroupAdapterBridge(ViewGroup viewGroup, BaseAdapter adapter) { |
| mViewGroup = new WeakReference<>(viewGroup); |
| mAdapter = adapter; |
| mReleased = false; |
| mAdapter.registerDataSetObserver(this); |
| refresh(); |
| } |
| |
| private void refresh() { |
| if (mReleased) { |
| return; |
| } |
| ViewGroup viewGroup = mViewGroup.get(); |
| if (viewGroup == null) { |
| release(); |
| return; |
| } |
| final int childCount = viewGroup.getChildCount(); |
| final int adapterCount = mAdapter.getCount(); |
| final int N = Math.max(childCount, adapterCount); |
| for (int i = 0; i < N; i++) { |
| if (i < adapterCount) { |
| View oldView = null; |
| if (i < childCount) { |
| oldView = viewGroup.getChildAt(i); |
| } |
| View newView = mAdapter.getView(i, oldView, viewGroup); |
| if (oldView == null) { |
| // We ran out of existing views. Add it at the end. |
| viewGroup.addView(newView); |
| } else if (oldView != newView) { |
| // We couldn't rebind the view. Replace it. |
| viewGroup.removeViewAt(i); |
| viewGroup.addView(newView, i); |
| } |
| } else { |
| int lastIndex = viewGroup.getChildCount() - 1; |
| viewGroup.removeViewAt(lastIndex); |
| } |
| } |
| } |
| |
| @Override |
| public void onChanged() { |
| refresh(); |
| } |
| |
| @Override |
| public void onInvalidated() { |
| release(); |
| } |
| |
| private void release() { |
| if (!mReleased) { |
| mReleased = true; |
| mAdapter.unregisterDataSetObserver(this); |
| } |
| } |
| } |
| } |