1/*
2 * Copyright (C) 2014 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 android.support.v4.view;
18
19import android.content.Context;
20import android.content.res.ColorStateList;
21import android.graphics.PorterDuff;
22import android.view.Display;
23import android.view.View;
24import android.view.ViewParent;
25import android.view.WindowManager;
26
27import java.lang.reflect.Field;
28
29class ViewCompatBase {
30
31    private static final String TAG = "ViewCompatBase";
32
33    private static Field sMinWidthField;
34    private static boolean sMinWidthFieldFetched;
35    private static Field sMinHeightField;
36    private static boolean sMinHeightFieldFetched;
37
38    static ColorStateList getBackgroundTintList(View view) {
39        return (view instanceof TintableBackgroundView)
40                ? ((TintableBackgroundView) view).getSupportBackgroundTintList()
41                : null;
42    }
43
44    static void setBackgroundTintList(View view, ColorStateList tintList) {
45        if (view instanceof TintableBackgroundView) {
46            ((TintableBackgroundView) view).setSupportBackgroundTintList(tintList);
47        }
48    }
49
50    static PorterDuff.Mode getBackgroundTintMode(View view) {
51        return (view instanceof TintableBackgroundView)
52                ? ((TintableBackgroundView) view).getSupportBackgroundTintMode()
53                : null;
54    }
55
56    static void setBackgroundTintMode(View view, PorterDuff.Mode mode) {
57        if (view instanceof TintableBackgroundView) {
58            ((TintableBackgroundView) view).setSupportBackgroundTintMode(mode);
59        }
60    }
61
62    static boolean isLaidOut(View view) {
63        return view.getWidth() > 0 && view.getHeight() > 0;
64    }
65
66    static int getMinimumWidth(View view) {
67        if (!sMinWidthFieldFetched) {
68            try {
69                sMinWidthField = View.class.getDeclaredField("mMinWidth");
70                sMinWidthField.setAccessible(true);
71            } catch (NoSuchFieldException e) {
72                // Couldn't find the field. Abort!
73            }
74            sMinWidthFieldFetched = true;
75        }
76
77        if (sMinWidthField != null) {
78            try {
79                return (int) sMinWidthField.get(view);
80            } catch (Exception e) {
81                // Field get failed. Oh well...
82            }
83        }
84
85        // We failed, return 0
86        return 0;
87    }
88
89    static int getMinimumHeight(View view) {
90        if (!sMinHeightFieldFetched) {
91            try {
92                sMinHeightField = View.class.getDeclaredField("mMinHeight");
93                sMinHeightField.setAccessible(true);
94            } catch (NoSuchFieldException e) {
95                // Couldn't find the field. Abort!
96            }
97            sMinHeightFieldFetched = true;
98        }
99
100        if (sMinHeightField != null) {
101            try {
102                return (int) sMinHeightField.get(view);
103            } catch (Exception e) {
104                // Field get failed. Oh well...
105            }
106        }
107
108        // We failed, return 0
109        return 0;
110    }
111
112    static boolean isAttachedToWindow(View view) {
113        return view.getWindowToken() != null;
114    }
115
116    static void offsetTopAndBottom(View view, int offset) {
117        final int currentTop = view.getTop();
118        view.offsetTopAndBottom(offset);
119
120        if (offset != 0) {
121            // We need to manually invalidate pre-honeycomb
122            final ViewParent parent = view.getParent();
123            if (parent instanceof View) {
124                final int absOffset = Math.abs(offset);
125                ((View) parent).invalidate(
126                        view.getLeft(),
127                        currentTop - absOffset,
128                        view.getRight(),
129                        currentTop + view.getHeight() + absOffset);
130            } else {
131                view.invalidate();
132            }
133        }
134    }
135
136    static void offsetLeftAndRight(View view, int offset) {
137        final int currentLeft = view.getLeft();
138        view.offsetLeftAndRight(offset);
139
140        if (offset != 0) {
141            // We need to manually invalidate pre-honeycomb
142            final ViewParent parent = view.getParent();
143            if (parent instanceof View) {
144                final int absOffset = Math.abs(offset);
145                ((View) parent).invalidate(
146                        currentLeft - absOffset,
147                        view.getTop(),
148                        currentLeft + view.getWidth() + absOffset,
149                        view.getBottom());
150            } else {
151                view.invalidate();
152            }
153        }
154    }
155
156    static Display getDisplay(View view) {
157        if (isAttachedToWindow(view)) {
158            final WindowManager wm = (WindowManager) view.getContext().getSystemService(
159                    Context.WINDOW_SERVICE);
160            return wm.getDefaultDisplay();
161        }
162        return null;
163    }
164
165}
166