FloatingActionButtonImpl.java revision 3d81c900316412b4130bf40e0dd8b0d3d3a93e78 
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    Drawable mShapeDrawable;
32    Drawable mRippleDrawable;
33    CircularBorderDrawable mBorderDrawable;
34    Drawable mContentBackground;
35
36    float mElevation;
37    float mPressedTranslationZ;
38
39    interface InternalVisibilityChangedListener {
40        public void onShown();
41        public void onHidden();
42    }
43
44    static final int SHOW_HIDE_ANIM_DURATION = 200;
45
46    static final int[] PRESSED_ENABLED_STATE_SET = {android.R.attr.state_pressed,
47            android.R.attr.state_enabled};
48    static final int[] FOCUSED_ENABLED_STATE_SET = {android.R.attr.state_focused,
49            android.R.attr.state_enabled};
50    static final int[] EMPTY_STATE_SET = new int[0];
51
52    final VisibilityAwareImageButton mView;
53    final ShadowViewDelegate mShadowViewDelegate;
54
55    private ViewTreeObserver.OnPreDrawListener mPreDrawListener;
56
57    FloatingActionButtonImpl(VisibilityAwareImageButton view,
58            ShadowViewDelegate shadowViewDelegate) {
59        mView = view;
60        mShadowViewDelegate = shadowViewDelegate;
61    }
62
63    abstract void setBackgroundDrawable(ColorStateList backgroundTint,
64            PorterDuff.Mode backgroundTintMode, int rippleColor, int borderWidth);
65
66    abstract void setBackgroundTintList(ColorStateList tint);
67
68    abstract void setBackgroundTintMode(PorterDuff.Mode tintMode);
69
70    abstract void setRippleColor(int rippleColor);
71
72    final void setElevation(float elevation) {
73        if (mElevation != elevation) {
74            mElevation = elevation;
75            onElevationChanged(elevation);
76        }
77    }
78
79    final void setPressedTranslationZ(float translationZ) {
80        if (mPressedTranslationZ != translationZ) {
81            mPressedTranslationZ = translationZ;
82            onTranslationZChanged(translationZ);
83        }
84    }
85
86    abstract void onElevationChanged(float elevation);
87
88    abstract void onTranslationZChanged(float translationZ);
89
90    abstract void onDrawableStateChanged(int[] state);
91
92    abstract void jumpDrawableToCurrentState();
93
94    abstract void hide(@Nullable InternalVisibilityChangedListener listener, boolean fromUser);
95
96    abstract void show(@Nullable InternalVisibilityChangedListener listener, boolean fromUser);
97
98    final Drawable getContentBackground() {
99        return mContentBackground;
100    }
101
102    void onAttachedToWindow() {
103        if (requirePreDrawListener()) {
104            ensurePreDrawListener();
105            mView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);
106        }
107    }
108
109    void onDetachedFromWindow() {
110        if (mPreDrawListener != null) {
111            mView.getViewTreeObserver().removeOnPreDrawListener(mPreDrawListener);
112            mPreDrawListener = null;
113        }
114    }
115
116    boolean requirePreDrawListener() {
117        return false;
118    }
119
120    CircularBorderDrawable createBorderDrawable(int borderWidth, ColorStateList backgroundTint) {
121        final Resources resources = mView.getResources();
122        CircularBorderDrawable borderDrawable = newCircularDrawable();
123        borderDrawable.setGradientColors(
124                resources.getColor(R.color.design_fab_stroke_top_outer_color),
125                resources.getColor(R.color.design_fab_stroke_top_inner_color),
126                resources.getColor(R.color.design_fab_stroke_end_inner_color),
127                resources.getColor(R.color.design_fab_stroke_end_outer_color));
128        borderDrawable.setBorderWidth(borderWidth);
129        borderDrawable.setBorderTint(backgroundTint);
130        return borderDrawable;
131    }
132
133    CircularBorderDrawable newCircularDrawable() {
134        return new CircularBorderDrawable();
135    }
136
137    void onPreDraw() {
138    }
139
140    private void ensurePreDrawListener() {
141        if (mPreDrawListener == null) {
142            mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
143                @Override
144                public boolean onPreDraw() {
145                    FloatingActionButtonImpl.this.onPreDraw();
146                    return true;
147                }
148            };
149        }
150    }
151
152    GradientDrawable createShapeDrawable() {
153        GradientDrawable d = new GradientDrawable();
154        d.setShape(GradientDrawable.OVAL);
155        d.setColor(Color.WHITE);
156        return d;
157    }
158}
159