1/*
2 * Copyright (C) 2012 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 com.android.keyguard;
18
19import android.annotation.NonNull;
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.graphics.Rect;
23import android.util.AttributeSet;
24import android.util.Log;
25import android.view.MotionEvent;
26import android.view.View;
27import android.view.ViewDebug;
28import android.view.ViewGroup;
29import android.view.ViewHierarchyEncoder;
30import android.view.WindowManager;
31import android.widget.FrameLayout;
32import android.widget.ViewFlipper;
33
34import com.android.internal.widget.LockPatternUtils;
35
36import java.lang.Override;
37
38/**
39 * Subclass of the current view flipper that allows us to overload dispatchTouchEvent() so
40 * we can emulate {@link WindowManager.LayoutParams#FLAG_SLIPPERY} within a view hierarchy.
41 *
42 */
43public class KeyguardSecurityViewFlipper extends ViewFlipper implements KeyguardSecurityView {
44    private static final String TAG = "KeyguardSecurityViewFlipper";
45    private static final boolean DEBUG = KeyguardConstants.DEBUG;
46
47    private Rect mTempRect = new Rect();
48
49    public KeyguardSecurityViewFlipper(Context context) {
50        this(context, null);
51    }
52
53    public KeyguardSecurityViewFlipper(Context context, AttributeSet attr) {
54        super(context, attr);
55    }
56
57    @Override
58    public boolean onTouchEvent(MotionEvent ev) {
59        boolean result = super.onTouchEvent(ev);
60        mTempRect.set(0, 0, 0, 0);
61        for (int i = 0; i < getChildCount(); i++) {
62            View child = getChildAt(i);
63            if (child.getVisibility() == View.VISIBLE) {
64                offsetRectIntoDescendantCoords(child, mTempRect);
65                ev.offsetLocation(mTempRect.left, mTempRect.top);
66                result = child.dispatchTouchEvent(ev) || result;
67                ev.offsetLocation(-mTempRect.left, -mTempRect.top);
68            }
69        }
70        return result;
71    }
72
73    KeyguardSecurityView getSecurityView() {
74        View child = getChildAt(getDisplayedChild());
75        if (child instanceof KeyguardSecurityView) {
76            return (KeyguardSecurityView) child;
77        }
78        return null;
79    }
80
81    @Override
82    public void setKeyguardCallback(KeyguardSecurityCallback callback) {
83        KeyguardSecurityView ksv = getSecurityView();
84        if (ksv != null) {
85            ksv.setKeyguardCallback(callback);
86        }
87    }
88
89    @Override
90    public void setLockPatternUtils(LockPatternUtils utils) {
91        KeyguardSecurityView ksv = getSecurityView();
92        if (ksv != null) {
93            ksv.setLockPatternUtils(utils);
94        }
95    }
96
97    @Override
98    public void reset() {
99        KeyguardSecurityView ksv = getSecurityView();
100        if (ksv != null) {
101            ksv.reset();
102        }
103    }
104
105    @Override
106    public void onPause() {
107        KeyguardSecurityView ksv = getSecurityView();
108        if (ksv != null) {
109            ksv.onPause();
110        }
111    }
112
113    @Override
114    public void onResume(int reason) {
115        KeyguardSecurityView ksv = getSecurityView();
116        if (ksv != null) {
117            ksv.onResume(reason);
118        }
119    }
120
121    @Override
122    public boolean needsInput() {
123        KeyguardSecurityView ksv = getSecurityView();
124        return (ksv != null) ? ksv.needsInput() : false;
125    }
126
127    @Override
128    public KeyguardSecurityCallback getCallback() {
129        KeyguardSecurityView ksv = getSecurityView();
130        return (ksv != null) ? ksv.getCallback() : null;
131    }
132
133    @Override
134    public void showPromptReason(int reason) {
135        KeyguardSecurityView ksv = getSecurityView();
136        if (ksv != null) {
137            ksv.showPromptReason(reason);
138        }
139    }
140
141    @Override
142    public void showMessage(String message, int color) {
143        KeyguardSecurityView ksv = getSecurityView();
144        if (ksv != null) {
145            ksv.showMessage(message, color);
146        }
147    }
148
149    @Override
150    public void showUsabilityHint() {
151        KeyguardSecurityView ksv = getSecurityView();
152        if (ksv != null) {
153            ksv.showUsabilityHint();
154        }
155    }
156
157    @Override
158    public void startAppearAnimation() {
159        KeyguardSecurityView ksv = getSecurityView();
160        if (ksv != null) {
161            ksv.startAppearAnimation();
162        }
163    }
164
165    @Override
166    public boolean startDisappearAnimation(Runnable finishRunnable) {
167        KeyguardSecurityView ksv = getSecurityView();
168        if (ksv != null) {
169            return ksv.startDisappearAnimation(finishRunnable);
170        } else {
171            return false;
172        }
173    }
174
175    @Override
176    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
177        return p instanceof LayoutParams;
178    }
179
180    @Override
181    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
182        return p instanceof LayoutParams ? new LayoutParams((LayoutParams) p) : new LayoutParams(p);
183    }
184
185    @Override
186    public LayoutParams generateLayoutParams(AttributeSet attrs) {
187        return new LayoutParams(getContext(), attrs);
188    }
189
190    @Override
191    protected void onMeasure(int widthSpec, int heightSpec) {
192        final int widthMode = MeasureSpec.getMode(widthSpec);
193        final int heightMode = MeasureSpec.getMode(heightSpec);
194        if (DEBUG && widthMode != MeasureSpec.AT_MOST) {
195            Log.w(TAG, "onMeasure: widthSpec " + MeasureSpec.toString(widthSpec) +
196                    " should be AT_MOST");
197        }
198        if (DEBUG && heightMode != MeasureSpec.AT_MOST) {
199            Log.w(TAG, "onMeasure: heightSpec " + MeasureSpec.toString(heightSpec) +
200                    " should be AT_MOST");
201        }
202
203        final int widthSize = MeasureSpec.getSize(widthSpec);
204        final int heightSize = MeasureSpec.getSize(heightSpec);
205        int maxWidth = widthSize;
206        int maxHeight = heightSize;
207        final int count = getChildCount();
208        for (int i = 0; i < count; i++) {
209            final View child = getChildAt(i);
210            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
211
212            if (lp.maxWidth > 0 && lp.maxWidth < maxWidth) {
213                maxWidth = lp.maxWidth;
214            }
215            if (lp.maxHeight > 0 && lp.maxHeight < maxHeight) {
216                maxHeight = lp.maxHeight;
217            }
218        }
219
220        final int wPadding = getPaddingLeft() + getPaddingRight();
221        final int hPadding = getPaddingTop() + getPaddingBottom();
222        maxWidth = Math.max(0, maxWidth - wPadding);
223        maxHeight = Math.max(0, maxHeight - hPadding);
224
225        int width = widthMode == MeasureSpec.EXACTLY ? widthSize : 0;
226        int height = heightMode == MeasureSpec.EXACTLY ? heightSize : 0;
227        for (int i = 0; i < count; i++) {
228            final View child = getChildAt(i);
229            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
230
231            final int childWidthSpec = makeChildMeasureSpec(maxWidth, lp.width);
232            final int childHeightSpec = makeChildMeasureSpec(maxHeight, lp.height);
233
234            child.measure(childWidthSpec, childHeightSpec);
235
236            width = Math.max(width, Math.min(child.getMeasuredWidth(), widthSize - wPadding));
237            height = Math.max(height, Math.min(child.getMeasuredHeight(), heightSize - hPadding));
238        }
239        setMeasuredDimension(width + wPadding, height + hPadding);
240    }
241
242    private int makeChildMeasureSpec(int maxSize, int childDimen) {
243        final int mode;
244        final int size;
245        switch (childDimen) {
246            case LayoutParams.WRAP_CONTENT:
247                mode = MeasureSpec.AT_MOST;
248                size = maxSize;
249                break;
250            case LayoutParams.MATCH_PARENT:
251                mode = MeasureSpec.EXACTLY;
252                size = maxSize;
253                break;
254            default:
255                mode = MeasureSpec.EXACTLY;
256                size = Math.min(maxSize, childDimen);
257                break;
258        }
259        return MeasureSpec.makeMeasureSpec(size, mode);
260    }
261
262    public static class LayoutParams extends FrameLayout.LayoutParams {
263        @ViewDebug.ExportedProperty(category = "layout")
264        public int maxWidth;
265
266        @ViewDebug.ExportedProperty(category = "layout")
267        public int maxHeight;
268
269        public LayoutParams(ViewGroup.LayoutParams other) {
270            super(other);
271        }
272
273        public LayoutParams(LayoutParams other) {
274            super(other);
275
276            maxWidth = other.maxWidth;
277            maxHeight = other.maxHeight;
278        }
279
280        public LayoutParams(Context c, AttributeSet attrs) {
281            super(c, attrs);
282
283            final TypedArray a = c.obtainStyledAttributes(attrs,
284                    R.styleable.KeyguardSecurityViewFlipper_Layout, 0, 0);
285            maxWidth = a.getDimensionPixelSize(
286                    R.styleable.KeyguardSecurityViewFlipper_Layout_layout_maxWidth, 0);
287            maxHeight = a.getDimensionPixelSize(
288                    R.styleable.KeyguardSecurityViewFlipper_Layout_layout_maxHeight, 0);
289            a.recycle();
290        }
291
292        /** @hide */
293        @Override
294        protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
295            super.encodeProperties(encoder);
296
297            encoder.addProperty("layout:maxWidth", maxWidth);
298            encoder.addProperty("layout:maxHeight", maxHeight);
299        }
300    }
301}
302