Improve GalleryDetailScene
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/*
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* Copyright 2015 Hippo Seven
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.widget;
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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Rect;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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import com.hippo.ehviewer.R;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* A ViewGroup that can layout views in line and auto wrap
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*
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* @author Hippo
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*
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*/
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public class AutoWrapLayout extends ViewGroup {
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private final List<Rect> rectList = new ArrayList<>();
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private Alignment mAlignment;
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private static final Alignment[] sBaseLineArray = { Alignment.TOP,
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Alignment.CENTER, Alignment.BOTTOM };
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public enum Alignment {
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TOP(0),
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CENTER(1),
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BOTTOM(2);
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Alignment(int ni) {
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nativeInt = ni;
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}
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final int nativeInt;
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}
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public AutoWrapLayout(Context context) {
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super(context);
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}
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public AutoWrapLayout(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public AutoWrapLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray a = context.obtainStyledAttributes(attrs,
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R.styleable.AutoWrapLayout, defStyle, 0);
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int index = a.getInt(R.styleable.AutoWrapLayout_alignment, -1);
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if (index >= 0) {
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setAlignment(sBaseLineArray[index]);
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}
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a.recycle();
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}
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public void setAlignment(Alignment baseLine) {
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if (baseLine == null) {
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return;
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}
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if (mAlignment != baseLine) {
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mAlignment = baseLine;
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requestLayout();
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invalidate();
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}
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}
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public Alignment getAlignment() {
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return mAlignment;
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}
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private void adjustBaseLine(int lineHeight, int startIndex, int endIndex) {
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if (mAlignment == Alignment.TOP)
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return;
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for (int index = startIndex; index < endIndex; index++) {
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final View child = getChildAt(index);
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final MarginLayoutParams lp =
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(MarginLayoutParams)child.getLayoutParams();
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Rect rect = rectList.get(index);
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int offsetRaw = lineHeight - rect.height() - lp.topMargin - lp.bottomMargin;
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if (mAlignment == Alignment.CENTER)
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rect.offset(0, offsetRaw/2);
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else if (mAlignment == Alignment.BOTTOM)
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rect.offset(0, offsetRaw);
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}
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}
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// TODO Take vertical mode
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/**
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* each row or line at least show one child
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*
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* horizontal only show child can show or partly show in parent
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*/
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@SuppressLint("DrawAllocation")
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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int maxWidth = MeasureSpec.getSize(widthMeasureSpec);
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int maxHeight = MeasureSpec.getSize(heightMeasureSpec);
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if (widthMode == MeasureSpec.UNSPECIFIED)
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maxWidth = Integer.MAX_VALUE;
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if (heightMode == MeasureSpec.UNSPECIFIED)
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maxHeight = Integer.MAX_VALUE;
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int paddingLeft = getPaddingLeft();
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int paddingTop = getPaddingTop();
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int paddingRight = getPaddingRight();
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int paddingBottom = getPaddingBottom();
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int maxRightBound = maxWidth - paddingRight;
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int maxBottomBound = maxHeight - paddingBottom;
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int left;
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int top;
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int right;
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int bottom;
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int rightBound = paddingLeft;
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int maxRightNoPadding = rightBound;
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int bottomBound;
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int lastMaxBottom = paddingTop;
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int maxBottom = lastMaxBottom;
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int childWidth;
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int childHeight;
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int lineStartIndex = 0;
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int lineEndIndex; // endIndex + 1
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rectList.clear();
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int childCount = getChildCount();
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for (int index = 0; index < childCount; index++) {
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final View child = getChildAt(index);
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child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
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if (child.getVisibility() == View.GONE)
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continue;
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final MarginLayoutParams lp =
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(MarginLayoutParams)child.getLayoutParams();
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childWidth = child.getMeasuredWidth();
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childHeight = child.getMeasuredHeight();
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left = rightBound + lp.leftMargin;
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right = left + childWidth;
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rightBound = right + lp.rightMargin;
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if (rightBound > maxRightBound) { // Go to next row
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lineEndIndex = index;
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// Adjust child position base on baseline
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adjustBaseLine(maxBottom - lastMaxBottom, lineStartIndex, lineEndIndex);
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// If child can't show in parent begin this line
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if (maxBottom >= maxBottomBound)
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break;
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// If it is first item in line, try to show it all
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if (lineEndIndex == lineStartIndex) {
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child.measure(MeasureSpec.makeMeasureSpec(
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maxWidth - paddingLeft - paddingRight
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- lp.leftMargin - lp.rightMargin, MeasureSpec.AT_MOST),
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MeasureSpec.UNSPECIFIED);
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childWidth = child.getMeasuredWidth();
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childHeight = child.getMeasuredHeight();
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}
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left = paddingLeft + lp.leftMargin;
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right = left + childWidth;
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rightBound = right + lp.rightMargin;
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lastMaxBottom = maxBottom;
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top = lastMaxBottom + lp.topMargin;
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bottom = top + childHeight;
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bottomBound = bottom + lp.bottomMargin;
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lineStartIndex = index;
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} else {
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top = lastMaxBottom + lp.topMargin;
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bottom = top + childHeight;
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bottomBound = bottom + lp.bottomMargin;
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}
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// Update max
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if (rightBound > maxRightNoPadding)
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maxRightNoPadding = rightBound;
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if (bottomBound > maxBottom)
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maxBottom = bottomBound;
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Rect rect = new Rect();
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rect.left = left;
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rect.top = top;
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rect.right = right;
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rect.bottom = bottom;
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rectList.add(rect);
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}
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// Handle last line baseline
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adjustBaseLine(maxBottom - lastMaxBottom, lineStartIndex, rectList.size());
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int measuredWidth;
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int measuredHeight;
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if (widthMode == MeasureSpec.EXACTLY)
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measuredWidth = maxWidth;
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else
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measuredWidth = maxRightNoPadding + paddingRight;
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if (heightMode == MeasureSpec.EXACTLY)
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measuredHeight = maxHeight;
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else {
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measuredHeight = maxBottom + paddingBottom;
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if (heightMode == MeasureSpec.AT_MOST)
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measuredHeight = measuredHeight > maxHeight ? maxHeight : measuredHeight;
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}
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setMeasuredDimension(measuredWidth, measuredHeight);
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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final int count = rectList.size();
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for(int i = 0; i < count; i++){
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final View child = this.getChildAt(i);
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if (child.getVisibility() == View.GONE)
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continue;
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Rect rect = rectList.get(i);
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child.layout(rect.left, rect.top, rect.right, rect.bottom);
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}
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}
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@Override
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public MarginLayoutParams generateLayoutParams(AttributeSet attrs) {
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return new MarginLayoutParams(getContext(), attrs);
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}
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@Override
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protected MarginLayoutParams generateDefaultLayoutParams() {
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return new MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
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}
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@Override
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protected MarginLayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
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return new MarginLayoutParams(p);
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}
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}
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