StatusIconContainer.java revision 264275e85824148d18ba0656de7826ea0e7ab2aa 
1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.systemui.statusbar.phone;
18
19import android.annotation.Nullable;
20import android.content.Context;
21import android.util.ArrayMap;
22import android.util.AttributeSet;
23
24import android.view.View;
25import com.android.keyguard.AlphaOptimizedLinearLayout;
26import com.android.systemui.R;
27import com.android.systemui.statusbar.StatusBarIconView;
28import com.android.systemui.statusbar.stack.ViewState;
29
30/**
31 * A container for Status bar system icons. Limits the number of system icons and handles overflow
32 * similar to NotificationIconController. Can be used to layout nested StatusIconContainers
33 *
34 * Children are expected to be of type StatusBarIconView.
35 */
36public class StatusIconContainer extends AlphaOptimizedLinearLayout {
37
38    private static final String TAG = "StatusIconContainer";
39    private static final boolean DEBUG = false;
40    private static final int MAX_ICONS = 5;
41    private static final int MAX_DOTS = 3;
42
43    public StatusIconContainer(Context context) {
44        this(context, null);
45    }
46
47    public StatusIconContainer(Context context, AttributeSet attrs) {
48        super(context, attrs);
49    }
50
51    @Override
52    protected void onLayout(boolean changed, int l, int t, int r, int b) {
53        float midY = getHeight() / 2.0f;
54
55        // Layout all child views so that we can move them around later
56        for (int i = 0; i < getChildCount(); i++) {
57            View child = getChildAt(i);
58            int width = child.getMeasuredWidth();
59            int height = child.getMeasuredHeight();
60            int top = (int) (midY - height / 2.0f);
61            child.layout(0, top, width, top + height);
62        }
63
64        resetViewStates();
65        calculateIconTranslations();
66        applyIconStates();
67    }
68
69    @Override
70    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
71        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
72
73        int width = MeasureSpec.getSize(widthMeasureSpec);
74        int widthSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.UNSPECIFIED);
75
76        final int count = getChildCount();
77        // Measure all children so that they report the correct width
78        for (int i = 0; i < count; i++) {
79            measureChild(getChildAt(i), widthSpec, heightMeasureSpec);
80        }
81    }
82
83    @Override
84    public void onViewAdded(View child) {
85        super.onViewAdded(child);
86        ViewState vs = new ViewState();
87        child.setTag(R.id.status_bar_view_state_tag, vs);
88    }
89
90    @Override
91    public void onViewRemoved(View child) {
92        super.onViewRemoved(child);
93        child.setTag(R.id.status_bar_view_state_tag, null);
94    }
95
96    /**
97     * Layout is happening from end -> start
98     */
99    private void calculateIconTranslations() {
100        float width = getWidth();
101        float translationX = width;
102        float contentStart = getPaddingStart();
103        int childCount = getChildCount();
104        // Underflow === don't show content until that index
105        int firstUnderflowIndex = -1;
106        if (DEBUG) android.util.Log.d(TAG, "calculateIconTransitions: start=" + translationX
107                + " width=" + width);
108
109        //TODO: Dots
110        for (int i = childCount - 1; i >= 0; i--) {
111            View child = getChildAt(i);
112            if (!(child instanceof StatusBarIconView)) {
113                continue;
114            }
115
116            ViewState childState = getViewStateFromChild(child);
117            if (childState == null ) {
118                continue;
119            }
120
121            // Rely on StatusBarIcon for truth about visibility
122            if (!((StatusBarIconView) child).getStatusBarIcon().visible) {
123                childState.hidden = true;
124                continue;
125            }
126
127            childState.xTranslation = translationX - child.getWidth();
128
129            if (childState.xTranslation < contentStart) {
130                if (firstUnderflowIndex == -1) {
131                    firstUnderflowIndex = i;
132                }
133            }
134
135            translationX -= child.getWidth();
136        }
137
138        if (firstUnderflowIndex != -1) {
139            for (int i = 0; i <= firstUnderflowIndex; i++) {
140                View child = getChildAt(i);
141                ViewState vs = getViewStateFromChild(child);
142                if (vs != null) {
143                    vs.hidden = true;
144                }
145            }
146        }
147
148        // Stole this from NotificationIconContainer. Not optimal but keeps the layout logic clean
149        if (isLayoutRtl()) {
150            for (int i = 0; i < childCount; i++) {
151                View child = getChildAt(i);
152                ViewState state = getViewStateFromChild(child);
153                state.xTranslation = width - state.xTranslation - child.getWidth();
154            }
155        }
156    }
157
158    private void applyIconStates() {
159        for (int i = 0; i < getChildCount(); i++) {
160            View child = getChildAt(i);
161            ViewState vs = getViewStateFromChild(child);
162            if (vs != null) {
163                vs.applyToView(child);
164            }
165        }
166    }
167
168    private void resetViewStates() {
169        for (int i = 0; i < getChildCount(); i++) {
170            View child = getChildAt(i);
171            ViewState vs = getViewStateFromChild(child);
172            if (vs == null) {
173                continue;
174            }
175
176            vs.initFrom(child);
177            vs.alpha = 1.0f;
178            if (child instanceof StatusBarIconView) {
179                vs.hidden = !((StatusBarIconView)child).getStatusBarIcon().visible;
180            } else {
181                vs.hidden = false;
182            }
183        }
184    }
185
186    private static @Nullable ViewState getViewStateFromChild(View child) {
187        return (ViewState) child.getTag(R.id.status_bar_view_state_tag);
188    }
189}
190