Transition.java
/*
* Copyright (C) 2021 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 androidx.constraintlayout.core.state;
import androidx.constraintlayout.core.widgets.ConstraintWidget;
import androidx.constraintlayout.core.widgets.ConstraintWidgetContainer;
import java.util.ArrayList;
import java.util.HashMap;
public class Transition {
HashMap<String, WidgetState> state = new HashMap<>();
public final static int START = 0;
public final static int END = 1;
public final static int CURRENT = 2;
static class WidgetState {
WidgetFrame start;
WidgetFrame end;
WidgetFrame interpolated;
public WidgetState() {
start = new WidgetFrame();
end = new WidgetFrame();
interpolated = new WidgetFrame();
}
public WidgetState(ConstraintWidget child) {
start = new WidgetFrame(child);
end = new WidgetFrame(child);
interpolated = new WidgetFrame(child);
}
public void interpolate(float progress) {
WidgetFrame.interpolate(interpolated, start, end, progress);
}
}
public boolean isEmpty() {
return state.isEmpty();
}
public void clear() {
state.clear();
}
public boolean contains(String key) {
return state.containsKey(key);
}
public void addCustomFloat(int state, String widgetId, String property, float value) {
WidgetState widgetState = this.state.get(widgetId);
if (widgetState == null) {
widgetState = new WidgetState();
this.state.put(widgetId, widgetState);
}
if (state == START) {
widgetState.start.addCustomFloat(property, value);
} else if (state == END) {
widgetState.end.addCustomFloat(property, value);
} else {
widgetState.interpolated.addCustomFloat(property, value);
}
}
public void addCustomColor(int state, String widgetId, String property,
float r, float g, float b, float a) {
WidgetState widgetState = this.state.get(widgetId);
if (widgetState == null) {
widgetState = new WidgetState();
this.state.put(widgetId, widgetState);
}
if (state == START) {
widgetState.start.addCustomColor(property, r, g, b, a);
} else if (state == END) {
widgetState.end.addCustomColor(property, r, g, b, a);
} else {
widgetState.interpolated.addCustomColor(property, r, g, b, a);
}
}
public void updateFrom(WidgetFrame frame, int state, String id) {
WidgetState widgetState = this.state.get(id);
if (widgetState == null) {
widgetState = new WidgetState(null);
}
if (state == START) {
widgetState.start = frame;
} else if (state == END) {
widgetState.end = frame;
} else {
widgetState.interpolated = frame;
}
this.state.put(id, widgetState);
}
public void updateFrom(ConstraintWidgetContainer container, int state) {
final ArrayList<ConstraintWidget> children = container.getChildren();
final int count = children.size();
for (int i = 0; i < count; i++) {
ConstraintWidget child = children.get(i);
WidgetState widgetState = this.state.get(child.stringId);
if (widgetState == null) {
widgetState = new WidgetState(child);
this.state.put(child.stringId, widgetState);
}
if (state == START) {
widgetState.start.update(child);
} else if (state == END) {
widgetState.end.update(child);
} else {
widgetState.interpolated.update(child);
}
}
}
public void interpolate(float progress) {
for (String key : state.keySet()) {
WidgetState widget = state.get(key);
widget.interpolate(progress);
}
}
public WidgetFrame getStart(String id) {
WidgetState widgetState = state.get(id);
if (widgetState == null) {
return null;
}
return widgetState.start;
}
public WidgetFrame getEnd(String id) {
WidgetState widgetState = state.get(id);
if (widgetState == null) {
return null;
}
return widgetState.end;
}
public WidgetFrame getInterpolated(String id) {
WidgetState widgetState = state.get(id);
if (widgetState == null) {
return null;
}
return widgetState.interpolated;
}
public WidgetFrame getStart(ConstraintWidget child) {
WidgetState widgetState = this.state.get(child.stringId);
if (widgetState == null) {
widgetState = new WidgetState(child);
state.put(child.stringId, widgetState);
}
return widgetState.start;
}
public WidgetFrame getEnd(ConstraintWidget child) {
WidgetState widgetState = this.state.get(child.stringId);
if (widgetState == null) {
widgetState = new WidgetState(child);
state.put(child.stringId, widgetState);
}
return widgetState.end;
}
public WidgetFrame getInterpolated(ConstraintWidget child) {
WidgetState widgetState = this.state.get(child.stringId);
if (widgetState == null) {
widgetState = new WidgetState(child);
state.put(child.stringId, widgetState);
}
return widgetState.interpolated;
}
}