BottomSheetDialog.java revision 657ea1100fee4750f148f9d0dcb7e7e2028f105e 
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.Context;
20import android.content.res.TypedArray;
21import android.os.Build;
22import android.os.Bundle;
23import android.support.annotation.LayoutRes;
24import android.support.annotation.NonNull;
25import android.support.annotation.StyleRes;
26import android.support.design.R;
27import android.support.v7.app.AppCompatDialog;
28import android.util.TypedValue;
29import android.view.View;
30import android.view.ViewGroup;
31import android.view.Window;
32import android.widget.FrameLayout;
33
34/**
35 * Base class for {@link android.app.Dialog}s styled as a bottom sheet.
36 */
37public class BottomSheetDialog extends AppCompatDialog {
38
39    private BottomSheetBehavior<FrameLayout> mBehavior;
40
41    boolean mCancelable = true;
42    private boolean mCanceledOnTouchOutside = true;
43    private boolean mCanceledOnTouchOutsideSet;
44
45    public BottomSheetDialog(@NonNull Context context) {
46        this(context, 0);
47    }
48
49    public BottomSheetDialog(@NonNull Context context, @StyleRes int theme) {
50        super(context, getThemeResId(context, theme));
51        // We hide the title bar for any style configuration. Otherwise, there will be a gap
52        // above the bottom sheet when it is expanded.
53        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
54    }
55
56    protected BottomSheetDialog(@NonNull Context context, boolean cancelable,
57            OnCancelListener cancelListener) {
58        super(context, cancelable, cancelListener);
59        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
60        mCancelable = cancelable;
61    }
62
63    @Override
64    public void setContentView(@LayoutRes int layoutResId) {
65        super.setContentView(wrapInBottomSheet(layoutResId, null, null));
66    }
67
68    @Override
69    protected void onCreate(Bundle savedInstanceState) {
70        super.onCreate(savedInstanceState);
71        getWindow().setLayout(
72                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
73    }
74
75    @Override
76    public void setContentView(View view) {
77        super.setContentView(wrapInBottomSheet(0, view, null));
78    }
79
80    @Override
81    public void setContentView(View view, ViewGroup.LayoutParams params) {
82        super.setContentView(wrapInBottomSheet(0, view, params));
83    }
84
85    @Override
86    public void setCancelable(boolean cancelable) {
87        super.setCancelable(cancelable);
88        if (mCancelable != cancelable) {
89            mCancelable = cancelable;
90            if (mBehavior != null) {
91                mBehavior.setHideable(cancelable);
92            }
93        }
94    }
95
96    @Override
97    public void setCanceledOnTouchOutside(boolean cancel) {
98        super.setCanceledOnTouchOutside(cancel);
99        if (cancel && !mCancelable) {
100            mCancelable = true;
101        }
102        mCanceledOnTouchOutside = cancel;
103        mCanceledOnTouchOutsideSet = true;
104    }
105
106    private View wrapInBottomSheet(int layoutResId, View view, ViewGroup.LayoutParams params) {
107        final CoordinatorLayout coordinator = (CoordinatorLayout) View.inflate(getContext(),
108                R.layout.design_bottom_sheet_dialog, null);
109        if (layoutResId != 0 && view == null) {
110            view = getLayoutInflater().inflate(layoutResId, coordinator, false);
111        }
112        FrameLayout bottomSheet = (FrameLayout) coordinator.findViewById(R.id.design_bottom_sheet);
113        mBehavior = BottomSheetBehavior.from(bottomSheet);
114        mBehavior.setBottomSheetCallback(mBottomSheetCallback);
115        mBehavior.setHideable(mCancelable);
116        if (params == null) {
117            bottomSheet.addView(view);
118        } else {
119            bottomSheet.addView(view, params);
120        }
121        // We treat the CoordinatorLayout as outside the dialog though it is technically inside
122        coordinator.findViewById(R.id.touch_outside).setOnClickListener(new View.OnClickListener() {
123            @Override
124            public void onClick(View view) {
125                if (mCancelable && isShowing() && shouldWindowCloseOnTouchOutside()) {
126                    cancel();
127                }
128            }
129        });
130        return coordinator;
131    }
132
133    boolean shouldWindowCloseOnTouchOutside() {
134        if (!mCanceledOnTouchOutsideSet) {
135            if (Build.VERSION.SDK_INT < 11) {
136                mCanceledOnTouchOutside = true;
137            } else {
138                TypedArray a = getContext().obtainStyledAttributes(
139                        new int[]{android.R.attr.windowCloseOnTouchOutside});
140                mCanceledOnTouchOutside = a.getBoolean(0, true);
141                a.recycle();
142            }
143            mCanceledOnTouchOutsideSet = true;
144        }
145        return mCanceledOnTouchOutside;
146    }
147
148    private static int getThemeResId(Context context, int themeId) {
149        if (themeId == 0) {
150            // If the provided theme is 0, then retrieve the dialogTheme from our theme
151            TypedValue outValue = new TypedValue();
152            if (context.getTheme().resolveAttribute(
153                    R.attr.bottomSheetDialogTheme, outValue, true)) {
154                themeId = outValue.resourceId;
155            } else {
156                // bottomSheetDialogTheme is not provided; we default to our light theme
157                themeId = R.style.Theme_Design_Light_BottomSheetDialog;
158            }
159        }
160        return themeId;
161    }
162
163    private BottomSheetBehavior.BottomSheetCallback mBottomSheetCallback
164            = new BottomSheetBehavior.BottomSheetCallback() {
165        @Override
166        public void onStateChanged(@NonNull View bottomSheet,
167                @BottomSheetBehavior.State int newState) {
168            if (newState == BottomSheetBehavior.STATE_HIDDEN) {
169                dismiss();
170            }
171        }
172
173        @Override
174        public void onSlide(@NonNull View bottomSheet, float slideOffset) {
175        }
176    };
177
178}
179