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/*
* Copyright (C) 2018 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 android.support.constraint.solver.widgets;
import android.support.constraint.solver.widgets.ConstraintWidget.DimensionBehaviour;
import java.util.ArrayList;
import static android.support.constraint.solver.widgets.ConstraintWidget.MATCH_CONSTRAINT_PERCENT;
import static android.support.constraint.solver.widgets.ConstraintWidget.MATCH_CONSTRAINT_RATIO;
import static android.support.constraint.solver.widgets.ConstraintWidget.MATCH_CONSTRAINT_SPREAD;
/**
* Class to represent a chain by its main elements.
*/
public class ChainHead {
protected ConstraintWidget mFirst;
protected ConstraintWidget mFirstVisibleWidget;
protected ConstraintWidget mLast;
protected ConstraintWidget mLastVisibleWidget;
protected ConstraintWidget mHead;
protected ConstraintWidget mFirstMatchConstraintWidget;
protected ConstraintWidget mLastMatchConstraintWidget;
protected ArrayList<ConstraintWidget> mWeightedMatchConstraintsWidgets;
protected int mWidgetsCount;
protected int mWidgetsMatchCount;
protected float mTotalWeight = 0f;
private int mOrientation;
private boolean mIsRtl = false;
protected boolean mHasUndefinedWeights;
protected boolean mHasDefinedWeights;
protected boolean mHasComplexMatchWeights;
private boolean mDefined;
/**
* Initialize variables, then determine visible widgets, the head of chain and
* matched constraint widgets.
*
* @param first first widget in a chain
* @param orientation orientation of the chain (either Horizontal or Vertical)
* @param isRtl Right-to-left layout flag to determine the actual head of the chain
*/
public ChainHead(ConstraintWidget first, int orientation, boolean isRtl){
mFirst = first;
mOrientation = orientation;
mIsRtl = isRtl;
}
/**
* Returns true if the widget should be part of the match equality rules in the chain
*
* @param widget the widget to test
* @param orientation current orientation, HORIZONTAL or VERTICAL
* @return
*/
static private boolean isMatchConstraintEqualityCandidate(ConstraintWidget widget, int orientation) {
return widget.getVisibility() != ConstraintWidget.GONE
&& widget.mListDimensionBehaviors[orientation] == ConstraintWidget.DimensionBehaviour.MATCH_CONSTRAINT
&& (widget.mResolvedMatchConstraintDefault[orientation] == MATCH_CONSTRAINT_SPREAD
|| widget.mResolvedMatchConstraintDefault[orientation] == MATCH_CONSTRAINT_RATIO);
}
private void defineChainProperties(){
int offset = mOrientation * 2;
ConstraintWidget lastVisited = mFirst;
// TraverseChain
ConstraintWidget widget = mFirst;
ConstraintWidget next = mFirst;
boolean done = false;
while (!done) {
mWidgetsCount++;
widget.mNextChainWidget[mOrientation] = null;
widget.mListNextMatchConstraintsWidget[mOrientation] = null;
if (widget.getVisibility() != ConstraintWidget.GONE) {
// Visible widgets linked list.
if (mFirstVisibleWidget == null) {
mFirstVisibleWidget = widget;
}
mLastVisibleWidget = widget;
// Match constraint linked list.
if (widget.mListDimensionBehaviors[mOrientation] == DimensionBehaviour.MATCH_CONSTRAINT
&& (widget.mResolvedMatchConstraintDefault[mOrientation] == MATCH_CONSTRAINT_SPREAD
|| widget.mResolvedMatchConstraintDefault[mOrientation] == MATCH_CONSTRAINT_RATIO
|| widget.mResolvedMatchConstraintDefault[mOrientation] == MATCH_CONSTRAINT_PERCENT)) {
mWidgetsMatchCount++;
float weight = widget.mWeight[mOrientation];
if (weight > 0) {
mTotalWeight += widget.mWeight[mOrientation];
}
if (isMatchConstraintEqualityCandidate(widget, mOrientation)) {
if (weight < 0) {
mHasUndefinedWeights = true;
} else {
mHasDefinedWeights = true;
}
if (mWeightedMatchConstraintsWidgets == null) {
mWeightedMatchConstraintsWidgets = new ArrayList<>();
}
mWeightedMatchConstraintsWidgets.add(widget);
}
if (mFirstMatchConstraintWidget == null) {
mFirstMatchConstraintWidget = widget;
}
if (mLastMatchConstraintWidget != null) {
mLastMatchConstraintWidget.mListNextMatchConstraintsWidget[mOrientation] = widget;
}
mLastMatchConstraintWidget = widget;
}
}
if (lastVisited != widget) {
lastVisited.mNextChainWidget[mOrientation] = widget;
}
lastVisited = widget;
// go to the next widget
ConstraintAnchor nextAnchor = widget.mListAnchors[offset + 1].mTarget;
if (nextAnchor != null) {
next = nextAnchor.mOwner;
if (next.mListAnchors[offset].mTarget == null
|| next.mListAnchors[offset].mTarget.mOwner != widget) {
next = null;
}
} else {
next = null;
}
if (next != null) {
widget = next;
} else {
done = true;
}
}
mLast = widget;
if (mOrientation == ConstraintWidget.HORIZONTAL && mIsRtl) {
mHead = mLast;
} else {
mHead = mFirst;
}
mHasComplexMatchWeights = mHasDefinedWeights && mHasUndefinedWeights;
}
public ConstraintWidget getFirst() {
return mFirst;
}
public ConstraintWidget getFirstVisibleWidget() {
return mFirstVisibleWidget;
}
public ConstraintWidget getLast() {
return mLast;
}
public ConstraintWidget getLastVisibleWidget() {
return mLastVisibleWidget;
}
public ConstraintWidget getHead() {
return mHead;
}
public ConstraintWidget getFirstMatchConstraintWidget() {
return mFirstMatchConstraintWidget;
}
public ConstraintWidget getLastMatchConstraintWidget() {
return mLastMatchConstraintWidget;
}
public float getTotalWeight() {
return mTotalWeight;
}
public void define() {
if (!mDefined) {
defineChainProperties();
}
mDefined = true;
}
}
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