FloatingActionButtonImpl.java revision fc780bab91bd4275ae2c3b75c3dfb327e008e4db 
1/*
2 * Copyright (C) 2015 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.design.widget;
18
19import android.content.res.ColorStateList;
20import android.content.res.Resources;
21import android.graphics.Color;
22import android.graphics.PorterDuff;
23import android.graphics.drawable.Drawable;
24import android.graphics.drawable.GradientDrawable;
25import android.support.annotation.Nullable;
26import android.support.design.R;
27import android.view.ViewTreeObserver;
28
29abstract class FloatingActionButtonImpl {
30
31    interface InternalVisibilityChangedListener {
32        public void onShown();
33        public void onHidden();
34    }
35
36    static final int SHOW_HIDE_ANIM_DURATION = 200;
37
38    static final int[] PRESSED_ENABLED_STATE_SET = {android.R.attr.state_pressed,
39            android.R.attr.state_enabled};
40    static final int[] FOCUSED_ENABLED_STATE_SET = {android.R.attr.state_focused,
41            android.R.attr.state_enabled};
42    static final int[] EMPTY_STATE_SET = new int[0];
43
44    final VisibilityAwareImageButton mView;
45    final ShadowViewDelegate mShadowViewDelegate;
46
47    private ViewTreeObserver.OnPreDrawListener mPreDrawListener;
48
49    FloatingActionButtonImpl(VisibilityAwareImageButton view,
50            ShadowViewDelegate shadowViewDelegate) {
51        mView = view;
52        mShadowViewDelegate = shadowViewDelegate;
53    }
54
55    abstract void setBackgroundDrawable(ColorStateList backgroundTint,
56            PorterDuff.Mode backgroundTintMode, int rippleColor, int borderWidth);
57
58    abstract void setBackgroundTintList(ColorStateList tint);
59
60    abstract void setBackgroundTintMode(PorterDuff.Mode tintMode);
61
62    abstract void setRippleColor(int rippleColor);
63
64    abstract void setElevation(float elevation);
65
66    abstract void setPressedTranslationZ(float translationZ);
67
68    abstract void onDrawableStateChanged(int[] state);
69
70    abstract void jumpDrawableToCurrentState();
71
72    abstract void hide(@Nullable InternalVisibilityChangedListener listener, boolean fromUser);
73
74    abstract void show(@Nullable InternalVisibilityChangedListener listener, boolean fromUser);
75
76    void onAttachedToWindow() {
77        if (requirePreDrawListener()) {
78            ensurePreDrawListener();
79            mView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);
80        }
81    }
82
83    void onDetachedFromWindow() {
84        if (mPreDrawListener != null) {
85            mView.getViewTreeObserver().removeOnPreDrawListener(mPreDrawListener);
86            mPreDrawListener = null;
87        }
88    }
89
90    boolean requirePreDrawListener() {
91        return false;
92    }
93
94    CircularBorderDrawable createBorderDrawable(int borderWidth, ColorStateList backgroundTint) {
95        final Resources resources = mView.getResources();
96        CircularBorderDrawable borderDrawable = newCircularDrawable();
97        borderDrawable.setGradientColors(
98                resources.getColor(R.color.design_fab_stroke_top_outer_color),
99                resources.getColor(R.color.design_fab_stroke_top_inner_color),
100                resources.getColor(R.color.design_fab_stroke_end_inner_color),
101                resources.getColor(R.color.design_fab_stroke_end_outer_color));
102        borderDrawable.setBorderWidth(borderWidth);
103        borderDrawable.setBorderTint(backgroundTint);
104        return borderDrawable;
105    }
106
107    CircularBorderDrawable newCircularDrawable() {
108        return new CircularBorderDrawable();
109    }
110
111    void onPreDraw() {
112    }
113
114    private void ensurePreDrawListener() {
115        if (mPreDrawListener == null) {
116            mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
117                @Override
118                public boolean onPreDraw() {
119                    FloatingActionButtonImpl.this.onPreDraw();
120                    return true;
121                }
122            };
123        }
124    }
125
126    GradientDrawable createShapeDrawable() {
127        GradientDrawable d = new GradientDrawable();
128        d.setShape(GradientDrawable.OVAL);
129        d.setColor(Color.WHITE);
130        return d;
131    }
132}
133