FloatingActionButtonImpl.java revision f0aec033caa46d2cdddad020b8748d24f921ad5b 
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.Rect;
24import android.graphics.drawable.Drawable;
25import android.graphics.drawable.GradientDrawable;
26import android.support.annotation.Nullable;
27import android.support.design.R;
28import android.view.ViewTreeObserver;
29import android.view.animation.Interpolator;
30
31abstract class FloatingActionButtonImpl {
32
33    static final Interpolator ANIM_INTERPOLATOR = AnimationUtils.FAST_OUT_LINEAR_IN_INTERPOLATOR;
34    static final long PRESSED_ANIM_DURATION = 100;
35    static final long PRESSED_ANIM_DELAY = 100;
36
37    Drawable mShapeDrawable;
38    Drawable mRippleDrawable;
39    CircularBorderDrawable mBorderDrawable;
40    Drawable mContentBackground;
41
42    float mElevation;
43    float mPressedTranslationZ;
44
45    interface InternalVisibilityChangedListener {
46        public void onShown();
47        public void onHidden();
48    }
49
50    static final int SHOW_HIDE_ANIM_DURATION = 200;
51
52    static final int[] PRESSED_ENABLED_STATE_SET = {android.R.attr.state_pressed,
53            android.R.attr.state_enabled};
54    static final int[] FOCUSED_ENABLED_STATE_SET = {android.R.attr.state_focused,
55            android.R.attr.state_enabled};
56    static final int[] ENABLED_STATE_SET = {android.R.attr.state_enabled};
57    static final int[] EMPTY_STATE_SET = new int[0];
58
59    final VisibilityAwareImageButton mView;
60    final ShadowViewDelegate mShadowViewDelegate;
61
62    private final Rect mTmpRect = new Rect();
63    private ViewTreeObserver.OnPreDrawListener mPreDrawListener;
64
65    FloatingActionButtonImpl(VisibilityAwareImageButton view,
66            ShadowViewDelegate shadowViewDelegate) {
67        mView = view;
68        mShadowViewDelegate = shadowViewDelegate;
69    }
70
71    abstract void setBackgroundDrawable(ColorStateList backgroundTint,
72            PorterDuff.Mode backgroundTintMode, int rippleColor, int borderWidth);
73
74    abstract void setBackgroundTintList(ColorStateList tint);
75
76    abstract void setBackgroundTintMode(PorterDuff.Mode tintMode);
77
78    abstract void setRippleColor(int rippleColor);
79
80    final void setElevation(float elevation) {
81        if (mElevation != elevation) {
82            mElevation = elevation;
83            onElevationsChanged(elevation, mPressedTranslationZ);
84        }
85    }
86
87    abstract float getElevation();
88
89    final void setPressedTranslationZ(float translationZ) {
90        if (mPressedTranslationZ != translationZ) {
91            mPressedTranslationZ = translationZ;
92            onElevationsChanged(mElevation, translationZ);
93        }
94    }
95
96    abstract void onElevationsChanged(float elevation, float pressedTranslationZ);
97
98    abstract void onDrawableStateChanged(int[] state);
99
100    abstract void jumpDrawableToCurrentState();
101
102    abstract void hide(@Nullable InternalVisibilityChangedListener listener, boolean fromUser);
103
104    abstract void show(@Nullable InternalVisibilityChangedListener listener, boolean fromUser);
105
106    final Drawable getContentBackground() {
107        return mContentBackground;
108    }
109
110    abstract void onCompatShadowChanged();
111
112    final void updatePadding() {
113        Rect rect = mTmpRect;
114        getPadding(rect);
115        onPaddingUpdated(rect);
116        mShadowViewDelegate.setShadowPadding(rect.left, rect.top, rect.right, rect.bottom);
117    }
118
119    abstract void getPadding(Rect rect);
120
121    void onPaddingUpdated(Rect padding) {}
122
123    void onAttachedToWindow() {
124        if (requirePreDrawListener()) {
125            ensurePreDrawListener();
126            mView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);
127        }
128    }
129
130    void onDetachedFromWindow() {
131        if (mPreDrawListener != null) {
132            mView.getViewTreeObserver().removeOnPreDrawListener(mPreDrawListener);
133            mPreDrawListener = null;
134        }
135    }
136
137    boolean requirePreDrawListener() {
138        return false;
139    }
140
141    CircularBorderDrawable createBorderDrawable(int borderWidth, ColorStateList backgroundTint) {
142        final Resources resources = mView.getResources();
143        CircularBorderDrawable borderDrawable = newCircularDrawable();
144        borderDrawable.setGradientColors(
145                resources.getColor(R.color.design_fab_stroke_top_outer_color),
146                resources.getColor(R.color.design_fab_stroke_top_inner_color),
147                resources.getColor(R.color.design_fab_stroke_end_inner_color),
148                resources.getColor(R.color.design_fab_stroke_end_outer_color));
149        borderDrawable.setBorderWidth(borderWidth);
150        borderDrawable.setBorderTint(backgroundTint);
151        return borderDrawable;
152    }
153
154    CircularBorderDrawable newCircularDrawable() {
155        return new CircularBorderDrawable();
156    }
157
158    void onPreDraw() {
159    }
160
161    private void ensurePreDrawListener() {
162        if (mPreDrawListener == null) {
163            mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
164                @Override
165                public boolean onPreDraw() {
166                    FloatingActionButtonImpl.this.onPreDraw();
167                    return true;
168                }
169            };
170        }
171    }
172
173    GradientDrawable createShapeDrawable() {
174        GradientDrawable d = new GradientDrawable();
175        d.setShape(GradientDrawable.OVAL);
176        d.setColor(Color.WHITE);
177        return d;
178    }
179}
180