NavigationBar.java revision fc8f4aad7395eca11f6d9b82eb266b1f4ee5041b 
1/*
2 * Copyright (C) 2011 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.layoutlib.bridge.bars;
18
19import com.android.layoutlib.bridge.android.BridgeContext;
20import com.android.resources.Density;
21
22import android.content.Context;
23import android.content.pm.ApplicationInfo;
24import android.util.AttributeSet;
25import android.util.DisplayMetrics;
26import android.view.View;
27import android.widget.LinearLayout;
28import android.widget.TextView;
29
30public class NavigationBar extends CustomBar {
31
32    /** Navigation bar background color attribute name. */
33    private static final String ATTR_COLOR = "navigationBarColor";
34    /** Attribute for translucency property. */
35    public static final String ATTR_TRANSLUCENT = "windowTranslucentNavigation";
36    // These correspond to @dimen/navigation_side_padding in the system ui code.
37    private static final int PADDING_WIDTH_DEFAULT = 36;
38    private static final int PADDING_WIDTH_SW360 = 40;
39    private static final int PADDING_WIDTH_SW400 = 50;
40    // These corresponds to @dimen/navigation_key_width in the system ui code.
41    private static final int WIDTH_DEFAULT = 36;
42    private static final int WIDTH_SW360 = 40;
43    private static final int WIDTH_SW600 = 48;
44    private static final String LAYOUT_XML = "/bars/navigation_bar.xml";
45    private static final String LAYOUT_600DP_XML = "/bars/navigation_bar600dp.xml";
46
47
48    /**
49     * Constructor to be used when creating the {@link NavigationBar} as a regular control.
50     * This is currently used by the theme editor.
51     */
52    @SuppressWarnings("unused")
53    public NavigationBar(Context context, AttributeSet attrs) {
54        this((BridgeContext) context,
55                Density.getEnum(((BridgeContext) context).getMetrics().densityDpi),
56                LinearLayout.HORIZONTAL, // In this mode, it doesn't need to be render vertically
57                ((BridgeContext) context).getConfiguration().getLayoutDirection() ==
58                        View.LAYOUT_DIRECTION_RTL,
59                (context.getApplicationInfo().flags & ApplicationInfo.FLAG_SUPPORTS_RTL) != 0,
60                0);
61    }
62
63    public NavigationBar(BridgeContext context, Density density, int orientation, boolean isRtl,
64            boolean rtlEnabled, int simulatedPlatformVersion) {
65        super(context, orientation, getShortestWidth(context)>= 600 ? LAYOUT_600DP_XML : LAYOUT_XML,
66                "navigation_bar.xml", simulatedPlatformVersion);
67
68        int color = getBarColor(ATTR_COLOR, ATTR_TRANSLUCENT);
69        setBackgroundColor(color == 0 ? 0xFF000000 : color);
70
71        // Cannot access the inside items through id because no R.id values have been
72        // created for them.
73        // We do know the order though.
74        // 0 is a spacer.
75        int back = 1;
76        int recent = 5;
77        if (orientation == LinearLayout.VERTICAL || (isRtl && !rtlEnabled)) {
78            // If RTL is enabled, then layoutlib mirrors the layout for us.
79            back = 5;
80            recent = 1;
81        }
82
83        //noinspection SpellCheckingInspection
84        loadIcon(back, "ic_sysbar_back.png", density, isRtl);
85        //noinspection SpellCheckingInspection
86        loadIcon(3, "ic_sysbar_home.png", density, isRtl);
87        //noinspection SpellCheckingInspection
88        loadIcon(recent, "ic_sysbar_recent.png", density, isRtl);
89        setupNavBar(context, orientation);
90    }
91
92    private void setupNavBar(BridgeContext context, int orientation) {
93        float sw = getShortestWidth(context);
94        View leftPadding = getChildAt(0);
95        View rightPadding = getChildAt(6);
96        setSize(context, leftPadding, orientation, getSidePadding(sw));
97        setSize(context, rightPadding, orientation, getSidePadding(sw));
98        int navButtonWidth = getWidth(sw);
99        for (int i = 1; i < 6; i += 2) {
100            View navButton = getChildAt(i);
101            setSize(context, navButton, orientation, navButtonWidth);
102        }
103        if (sw >= 600) {
104            setSize(context, getChildAt(2), orientation, 128);
105            setSize(context, getChildAt(4), orientation, 128);
106        }
107    }
108
109    private static void setSize(BridgeContext context, View view, int orientation, int size) {
110        size *= context.getMetrics().density;
111        LayoutParams layoutParams = (LayoutParams) view.getLayoutParams();
112        if (orientation == HORIZONTAL) {
113            layoutParams.width = size;
114        } else {
115            layoutParams.height = size;
116        }
117        view.setLayoutParams(layoutParams);
118    }
119
120    private static int getSidePadding(float sw) {
121        if (sw >= 400) {
122            return PADDING_WIDTH_SW400;
123        }
124        if (sw >= 360) {
125            return PADDING_WIDTH_SW360;
126        }
127        return PADDING_WIDTH_DEFAULT;
128    }
129
130    private static int getWidth(float sw) {
131        if (sw >= 600) {
132            return WIDTH_SW600;
133        }
134        if (sw >= 360) {
135            return WIDTH_SW360;
136        }
137        return WIDTH_DEFAULT;
138    }
139
140    private static float getShortestWidth(BridgeContext context) {
141        DisplayMetrics metrics = context.getMetrics();
142        float sw = metrics.widthPixels < metrics.heightPixels ?
143                metrics.widthPixels : metrics.heightPixels;
144        sw /= metrics.density;
145        return sw;
146    }
147
148    @Override
149    protected TextView getStyleableTextView() {
150        return null;
151    }
152}
153