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      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 
     17 package com.android.tools.idea.editors.theme.widgets;
     18 
     19 import com.android.ide.common.rendering.api.LayoutLog;
     20 import com.android.layoutlib.bridge.Bridge;
     21 
     22 import android.content.Context;
     23 import android.graphics.Canvas;
     24 import android.util.AttributeSet;
     25 import android.view.View;
     26 import 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
     35 public 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