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 com.android.tools.idea.editors.theme.widgets;
18
19import com.android.ide.common.rendering.api.LayoutLog;
20import com.android.layoutlib.bridge.Bridge;
21
22import android.content.Context;
23import android.graphics.Canvas;
24import android.util.AttributeSet;
25import android.view.View;
26import android.view.ViewGroup;
27
28/**
29 * {@link ViewGroup} that wraps another view and catches any possible exceptions that the child view
30 * might generate.
31 * This is used by the theme editor to stop custom views from breaking the preview.
32 */
33// TODO: This view is just a temporary solution that will be replaced by adding a try / catch
34// for custom views in the ClassConverter
35public class ErrorCatcher extends ViewGroup {
36    public ErrorCatcher(Context context) {
37        super(context);
38    }
39
40    public ErrorCatcher(Context context, AttributeSet attrs) {
41        super(context, attrs);
42    }
43
44    public ErrorCatcher(Context context, AttributeSet attrs, int defStyleAttr) {
45        super(context, attrs, defStyleAttr);
46    }
47
48    public ErrorCatcher(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
49        super(context, attrs, defStyleAttr, defStyleRes);
50    }
51
52    @Override
53    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
54        assert getChildCount() == 1 : "ErrorCatcher can only have one child";
55
56        View child = getChildAt(0);
57        try {
58            measureChild(child, widthMeasureSpec, heightMeasureSpec);
59
60            setMeasuredDimension(resolveSize(child.getMeasuredWidth(), widthMeasureSpec),
61                    resolveSize(child.getMeasuredHeight(), heightMeasureSpec));
62        } catch (Throwable t) {
63            Bridge.getLog().warning(LayoutLog.TAG_BROKEN, "Failed to do onMeasure for view " +
64                    child.getClass().getCanonicalName(), t);
65            setMeasuredDimension(resolveSize(0, widthMeasureSpec),
66                    resolveSize(0, heightMeasureSpec));
67        }
68    }
69
70    @Override
71    protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
72        try {
73            return super.drawChild(canvas, child, drawingTime);
74        } catch (Throwable t) {
75            Bridge.getLog().warning(LayoutLog.TAG_BROKEN, "Failed to draw for view " +
76                    child.getClass().getCanonicalName(), t);
77        }
78
79        return false;
80    }
81
82    @Override
83    protected void onLayout(boolean changed, int l, int t, int r, int b) {
84        assert getChildCount() == 1 : "ErrorCatcher can only have one child";
85
86        View child = getChildAt(0);
87        try {
88            child.layout(0, 0, child.getMeasuredWidth(), child.getMeasuredHeight());
89        } catch (Throwable e) {
90            Bridge.getLog().warning(LayoutLog.TAG_BROKEN, "Failed to do onLayout for view " +
91                    child.getClass().getCanonicalName(), e);
92        }
93    }
94}
95