64 lines
2.3 KiB
Java
64 lines
2.3 KiB
Java
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.view;
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import android.os.Trace;
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/**
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* Keeps and caches strings used to trace {@link View} traversals.
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* <p>
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* This is done to avoid expensive computations of them every time, which can improve performance.
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*/
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class ViewTraversalTracingStrings {
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/** {@link Trace} tag used to mark {@link View#onMeasure(int, int)}. */
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public final String onMeasure;
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/** {@link Trace} tag used to mark {@link View#onLayout(boolean, int, int, int, int)}. */
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public final String onLayout;
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/** Caches the view simple name to avoid re-computations. */
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public final String classSimpleName;
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/** Prefix for request layout stacktraces output in logs. */
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public final String requestLayoutStacktracePrefix;
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/** {@link Trace} tag used to mark {@link View#onMeasure(int, int)} happening before layout. */
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public final String onMeasureBeforeLayout;
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/**
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* @param v {@link View} from where to get the class name.
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*/
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ViewTraversalTracingStrings(View v) {
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String className = v.getClass().getSimpleName();
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classSimpleName = className;
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onMeasureBeforeLayout = getTraceName("onMeasureBeforeLayout", className, v);
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onMeasure = getTraceName("onMeasure", className, v);
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onLayout = getTraceName("onLayout", className, v);
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requestLayoutStacktracePrefix = "requestLayout " + className;
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}
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private String getTraceName(String sectionName, String className, View v) {
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StringBuilder out = new StringBuilder();
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out.append(sectionName);
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out.append(" ");
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out.append(className);
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v.appendId(out);
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return out.substring(0, Math.min(out.length() - 1, Trace.MAX_SECTION_NAME_LEN - 1));
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}
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}
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