1/*
2 * Copyright 2023, 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
17import {assertDefined} from 'common/assert_utils';
18import {VariableHeightScrollStrategy} from 'viewers/common/variable_height_scroll_strategy';
19import {ProtologEntry} from 'viewers/viewer_protolog/ui_data';
20
21export class ProtologScrollStrategy extends VariableHeightScrollStrategy {
22  protected readonly defaultRowSize = 16;
23  private readonly textCharsPerRow = 150;
24  private readonly timestampCharsPerRow = 20;
25  private readonly sourceFileCharsPerRow = 50;
26
27  protected override predictScrollItemHeight(entry: ProtologEntry): number {
28    const textHeight = this.subItemHeight(
29      entry.fields[3].value as string,
30      this.textCharsPerRow,
31    );
32    const timestampHeight = this.subItemHeight(
33      entry.traceEntry.getTimestamp().format(),
34      this.timestampCharsPerRow,
35    );
36    const sourceFileHeight = this.subItemHeight(
37      assertDefined(entry.fields[2]).value as string,
38      this.sourceFileCharsPerRow,
39    );
40    return Math.max(textHeight, timestampHeight, sourceFileHeight);
41  }
42}
43