1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright (C) 2018 The Android Open Source Project * Copyright (C) 201
*
* 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 static android.support.constraint.solver.widgets.ConstraintWidget.HORIZONTAL;
import static android.support.constraint.solver.widgets.ConstraintWidget.UNKNOWN;
import static android.support.constraint.solver.widgets.ConstraintWidget.VERTICAL;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Class for groups of widgets constrained between each other in a ConstraintWidgetContainer.
* <p>
* Will possess the list of ConstraintWidget in the group.
* The mChains that exist in the group.
* Each group can be solved for individually.
*/
public class ConstraintWidgetGroup {
public List<ConstraintWidget> mConstrainedGroup;
int mGroupWidth = UNKNOWN;
int mGroupHeight = UNKNOWN;
public boolean mSkipSolver = false;
public final int[] mGroupDimensions = {mGroupWidth, mGroupHeight};
/**
* Arrays to contain the widgets that determine the start of a group relative to their layout.
* A widget is at the start, if their left/top anchor is constrained to their parent.
* If the left/top constraint is null, is considered at the start if there are no widgets
* constrained to it from their right/bottom anchor.
*/
List<ConstraintWidget> mStartHorizontalWidgets = new ArrayList<>();
List<ConstraintWidget> mStartVerticalWidgets = new ArrayList<>();
HashSet<ConstraintWidget> mWidgetsToSetHorizontal = new HashSet<>();
HashSet<ConstraintWidget> mWidgetsToSetVertical = new HashSet<>();
List<ConstraintWidget> mWidgetsToSolve = new ArrayList<>();
List<ConstraintWidget> mUnresolvedWidgets = new ArrayList<>();
ConstraintWidgetGroup(List<ConstraintWidget> widgets) {
this.mConstrainedGroup = widgets;
}
ConstraintWidgetGroup(List<ConstraintWidget> widgets, boolean skipSolver) {
this.mConstrainedGroup = widgets;
this.mSkipSolver = skipSolver;
}
public List<ConstraintWidget> getStartWidgets(int orientation) {
if (orientation == HORIZONTAL) {
return mStartHorizontalWidgets;
} else if (orientation == VERTICAL) {
return mStartVerticalWidgets;
}
return null;
}
Set<ConstraintWidget> getWidgetsToSet(int orientation) {
if (orientation == HORIZONTAL) {
return mWidgetsToSetHorizontal;
} else if (orientation == VERTICAL) {
return mWidgetsToSetVertical;
}
return null;
}
void addWidgetsToSet(ConstraintWidget widget, int orientation) {
if (orientation == HORIZONTAL) {
mWidgetsToSetHorizontal.add(widget);
} else if (orientation == VERTICAL) {
mWidgetsToSetVertical.add(widget);
}
}
/**
* Get a list of widgets that haven't been fully resolved and require the Linear Solver
* to resolve.
* Sets {@link #mUnresolvedWidgets} with the widgets that haven't been resolved, but don't
* require the Linear Solver.
*
* @return List of widgets to be solved.
*/
List<ConstraintWidget> getWidgetsToSolve() {
if (!mWidgetsToSolve.isEmpty()) {
return mWidgetsToSolve;
}
final int size = mConstrainedGroup.size();
for (int i = 0; i < size; i++) {
ConstraintWidget widget = mConstrainedGroup.get(i);
if (!widget.mOptimizerMeasurable) {
getWidgetsToSolveTraversal((ArrayList<ConstraintWidget>)mWidgetsToSolve, widget);
}
}
mUnresolvedWidgets.clear();
mUnresolvedWidgets.addAll(mConstrainedGroup);
mUnresolvedWidgets.removeAll(mWidgetsToSolve);
return mWidgetsToSolve;
}
/**
* Helper method to find widgets to be solved.
*
* @param widgetsToSolve Current list of widgets to be solved.
* @param widget Widget being traversed.
*/
private void getWidgetsToSolveTraversal(ArrayList<ConstraintWidget> widgetsToSolve, ConstraintWidget widget) {
if (widget.mGroupsToSolver) {
return;
}
widgetsToSolve.add(widget);
widget.mGroupsToSolver = true;
if (widget.isFullyResolved()) {
return;
}
if (widget instanceof Helper) {
Helper helper = (Helper) widget;
final int widgetCount = helper.mWidgetsCount;
for (int i = 0; i < widgetCount; i++) {
getWidgetsToSolveTraversal(widgetsToSolve, helper.mWidgets[i]);
}
}
// Propagate from every unmeasurable widget to the parent.
final int count = widget.mListAnchors.length;
for (int i = 0; i < count; i++) {
ConstraintAnchor targetAnchor = widget.mListAnchors[i].mTarget;
ConstraintWidget targetWidget = null;
if (targetAnchor != null) {
targetWidget = targetAnchor.mOwner;
} else {
continue;
}
// Traverse until we hit a resolved widget or the parent.
if (targetAnchor != null && (targetWidget != widget.getParent())) {
getWidgetsToSolveTraversal(widgetsToSolve, targetWidget);
}
}
}
/**
* After solving, update any widgets that depended on unmeasurable widgets.
*/
void updateUnresolvedWidgets() {
final int size = mUnresolvedWidgets.size();
for (int i = 0; i < size; i++) {
ConstraintWidget widget = mUnresolvedWidgets.get(i);
// Needs start, end, orientation.
// Or left,right/top, bottom.
updateResolvedDimension(widget);
}
}
/**
* Update widget's dimension according to the widget it depends on.
*
* @param widget Widget to resolve dimension.
*/
private void updateResolvedDimension(ConstraintWidget widget) {
int start = 0, end = 0;
if (widget.mOptimizerMeasurable) {
// No need to update dimension if it has been resolved.
if (widget.isFullyResolved()) {
return;
}
// Horizontal.
boolean rightSide = widget.mRight.mTarget != null;
ConstraintAnchor targetAnchor;
// Get measure if target is resolved, otherwise, resolve target.
if (rightSide) {
targetAnchor = widget.mRight.mTarget;
} else {
targetAnchor = widget.mLeft.mTarget;
}
if (targetAnchor != null) {
if (!targetAnchor.mOwner.mOptimizerMeasured) {
updateResolvedDimension(targetAnchor.mOwner);
}
if (targetAnchor.mType == ConstraintAnchor.Type.RIGHT) {
end = targetAnchor.mOwner.mX + targetAnchor.mOwner.getWidth();
} else if (targetAnchor.mType == ConstraintAnchor.Type.LEFT) {
end = targetAnchor.mOwner.mX;
}
}
if (rightSide) {
end -= widget.mRight.getMargin();
} else {
end += widget.mLeft.getMargin() + widget.getWidth();
}
start = end - widget.getWidth();
widget.setHorizontalDimension(start, end);
// Vertical.
if (widget.mBaseline.mTarget != null) {
targetAnchor = widget.mBaseline.mTarget;
if (!targetAnchor.mOwner.mOptimizerMeasured) {
updateResolvedDimension(targetAnchor.mOwner);
}
start = targetAnchor.mOwner.mY + targetAnchor.mOwner.mBaselineDistance
- widget.mBaselineDistance;
end = start + widget.mHeight;
widget.setVerticalDimension(start, end);
widget.mOptimizerMeasured = true;
return;
}
boolean bottomSide = widget.mBottom.mTarget != null;
// Get measure if target is resolved, otherwise, resolve target.
if (bottomSide) {
targetAnchor = widget.mBottom.mTarget;
} else {
targetAnchor = widget.mTop.mTarget;
}
if (targetAnchor != null) {
if (!targetAnchor.mOwner.mOptimizerMeasured) {
updateResolvedDimension(targetAnchor.mOwner);
}
if (targetAnchor.mType == ConstraintAnchor.Type.BOTTOM) {
end = targetAnchor.mOwner.mY + targetAnchor.mOwner.getHeight();
} else if (targetAnchor.mType == ConstraintAnchor.Type.TOP) {
end = targetAnchor.mOwner.mY;
}
}
if (bottomSide) {
end -= widget.mBottom.getMargin();
} else {
end += widget.mTop.getMargin() + widget.getHeight();
}
start = end - widget.getHeight();
widget.setVerticalDimension(start, end);
widget.mOptimizerMeasured = true;
}
}
}
|
