| /* |
| * Copyright (C) 2016 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.internal.widget; |
| |
| import android.annotation.Nullable; |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Canvas; |
| import android.util.AttributeSet; |
| import android.view.RemotableViewMethod; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.RemoteViews; |
| |
| import com.android.internal.R; |
| |
| /** |
| * A custom-built layout for the Notification.MessagingStyle. |
| * |
| * Evicts children until they all fit. |
| */ |
| @RemoteViews.RemoteView |
| public class MessagingLinearLayout extends ViewGroup { |
| |
| /** |
| * Spacing to be applied between views. |
| */ |
| private int mSpacing; |
| |
| private int mMaxDisplayedLines = Integer.MAX_VALUE; |
| |
| private MessagingLayout mMessagingLayout; |
| |
| public MessagingLinearLayout(Context context, @Nullable AttributeSet attrs) { |
| super(context, attrs); |
| |
| final TypedArray a = context.obtainStyledAttributes(attrs, |
| R.styleable.MessagingLinearLayout, 0, |
| 0); |
| |
| final int N = a.getIndexCount(); |
| for (int i = 0; i < N; i++) { |
| int attr = a.getIndex(i); |
| switch (attr) { |
| case R.styleable.MessagingLinearLayout_spacing: |
| mSpacing = a.getDimensionPixelSize(i, 0); |
| break; |
| } |
| } |
| |
| a.recycle(); |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| // This is essentially a bottom-up linear layout that only adds children that fit entirely |
| // up to a maximum height. |
| int targetHeight = MeasureSpec.getSize(heightMeasureSpec); |
| switch (MeasureSpec.getMode(heightMeasureSpec)) { |
| case MeasureSpec.UNSPECIFIED: |
| targetHeight = Integer.MAX_VALUE; |
| break; |
| } |
| |
| // Now that we know which views to take, fix up the indents and see what width we get. |
| int measuredWidth = mPaddingLeft + mPaddingRight; |
| final int count = getChildCount(); |
| int totalHeight; |
| for (int i = 0; i < count; ++i) { |
| final View child = getChildAt(i); |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| lp.hide = true; |
| } |
| |
| totalHeight = mPaddingTop + mPaddingBottom; |
| boolean first = true; |
| int linesRemaining = mMaxDisplayedLines; |
| // Starting from the bottom: we measure every view as if it were the only one. If it still |
| // fits, we take it, otherwise we stop there. |
| for (int i = count - 1; i >= 0 && totalHeight < targetHeight; i--) { |
| if (getChildAt(i).getVisibility() == GONE) { |
| continue; |
| } |
| final View child = getChildAt(i); |
| LayoutParams lp = (LayoutParams) getChildAt(i).getLayoutParams(); |
| MessagingChild messagingChild = null; |
| int spacing = mSpacing; |
| if (child instanceof MessagingChild) { |
| messagingChild = (MessagingChild) child; |
| messagingChild.setMaxDisplayedLines(linesRemaining); |
| spacing += messagingChild.getExtraSpacing(); |
| } |
| spacing = first ? 0 : spacing; |
| measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, totalHeight |
| - mPaddingTop - mPaddingBottom + spacing); |
| |
| final int childHeight = child.getMeasuredHeight(); |
| int newHeight = Math.max(totalHeight, totalHeight + childHeight + lp.topMargin + |
| lp.bottomMargin + spacing); |
| int measureType = MessagingChild.MEASURED_NORMAL; |
| if (messagingChild != null) { |
| measureType = messagingChild.getMeasuredType(); |
| linesRemaining -= messagingChild.getConsumedLines(); |
| } |
| |
| // We never measure the first item as too small, we want to at least show something. |
| boolean isTooSmall = measureType == MessagingChild.MEASURED_TOO_SMALL && !first; |
| boolean isShortened = measureType == MessagingChild.MEASURED_SHORTENED |
| || measureType == MessagingChild.MEASURED_TOO_SMALL && first; |
| if (newHeight <= targetHeight && !isTooSmall) { |
| totalHeight = newHeight; |
| measuredWidth = Math.max(measuredWidth, |
| child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin |
| + mPaddingLeft + mPaddingRight); |
| lp.hide = false; |
| if (isShortened || linesRemaining <= 0) { |
| break; |
| } |
| } else { |
| break; |
| } |
| first = false; |
| } |
| |
| setMeasuredDimension( |
| resolveSize(Math.max(getSuggestedMinimumWidth(), measuredWidth), |
| widthMeasureSpec), |
| Math.max(getSuggestedMinimumHeight(), totalHeight)); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| final int paddingLeft = mPaddingLeft; |
| |
| int childTop; |
| |
| // Where right end of child should go |
| final int width = right - left; |
| final int childRight = width - mPaddingRight; |
| |
| final int layoutDirection = getLayoutDirection(); |
| final int count = getChildCount(); |
| |
| childTop = mPaddingTop; |
| |
| boolean first = true; |
| final boolean shown = isShown(); |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| if (child.getVisibility() == GONE) { |
| continue; |
| } |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| MessagingChild messagingChild = (MessagingChild) child; |
| |
| final int childWidth = child.getMeasuredWidth(); |
| final int childHeight = child.getMeasuredHeight(); |
| |
| int childLeft; |
| if (layoutDirection == LAYOUT_DIRECTION_RTL) { |
| childLeft = childRight - childWidth - lp.rightMargin; |
| } else { |
| childLeft = paddingLeft + lp.leftMargin; |
| } |
| if (lp.hide) { |
| if (shown && lp.visibleBefore) { |
| // We still want to lay out the child to have great animations |
| child.layout(childLeft, childTop, childLeft + childWidth, |
| childTop + lp.lastVisibleHeight); |
| messagingChild.hideAnimated(); |
| } |
| lp.visibleBefore = false; |
| continue; |
| } else { |
| lp.visibleBefore = true; |
| lp.lastVisibleHeight = childHeight; |
| } |
| |
| if (!first) { |
| childTop += mSpacing; |
| } |
| |
| childTop += lp.topMargin; |
| child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight); |
| |
| childTop += childHeight + lp.bottomMargin; |
| |
| first = false; |
| } |
| } |
| |
| @Override |
| protected boolean drawChild(Canvas canvas, View child, long drawingTime) { |
| final LayoutParams lp = (LayoutParams) child.getLayoutParams(); |
| if (lp.hide) { |
| MessagingChild messagingChild = (MessagingChild) child; |
| if (!messagingChild.isHidingAnimated()) { |
| return true; |
| } |
| } |
| return super.drawChild(canvas, child, drawingTime); |
| } |
| |
| @Override |
| public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| return new LayoutParams(mContext, attrs); |
| } |
| |
| @Override |
| protected LayoutParams generateDefaultLayoutParams() { |
| return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); |
| |
| } |
| |
| @Override |
| protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { |
| LayoutParams copy = new LayoutParams(lp.width, lp.height); |
| if (lp instanceof MarginLayoutParams) { |
| copy.copyMarginsFrom((MarginLayoutParams) lp); |
| } |
| return copy; |
| } |
| |
| public static boolean isGone(View view) { |
| if (view.getVisibility() == View.GONE) { |
| return true; |
| } |
| final ViewGroup.LayoutParams lp = view.getLayoutParams(); |
| if (lp instanceof MessagingLinearLayout.LayoutParams |
| && ((MessagingLinearLayout.LayoutParams) lp).hide) { |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Sets how many lines should be displayed at most |
| */ |
| @RemotableViewMethod |
| public void setMaxDisplayedLines(int numberLines) { |
| mMaxDisplayedLines = numberLines; |
| } |
| |
| public void setMessagingLayout(MessagingLayout layout) { |
| mMessagingLayout = layout; |
| } |
| |
| public MessagingLayout getMessagingLayout() { |
| return mMessagingLayout; |
| } |
| |
| public interface MessagingChild { |
| int MEASURED_NORMAL = 0; |
| int MEASURED_SHORTENED = 1; |
| int MEASURED_TOO_SMALL = 2; |
| |
| int getMeasuredType(); |
| int getConsumedLines(); |
| void setMaxDisplayedLines(int lines); |
| void hideAnimated(); |
| boolean isHidingAnimated(); |
| default int getExtraSpacing() { |
| return 0; |
| } |
| } |
| |
| public static class LayoutParams extends MarginLayoutParams { |
| |
| public boolean hide = false; |
| public boolean visibleBefore = false; |
| public int lastVisibleHeight; |
| |
| public LayoutParams(Context c, AttributeSet attrs) { |
| super(c, attrs); |
| } |
| |
| public LayoutParams(int width, int height) { |
| super(width, height); |
| } |
| } |
| } |