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 {VariableHeightScrollStrategy} from 'viewers/common/variable_height_scroll_strategy';
18import {UiDataMessage} from 'viewers/viewer_protolog/ui_data';
19
20export class ProtologScrollStrategy extends VariableHeightScrollStrategy {
21  protected readonly defaultRowSize = 16;
22  private readonly textCharsPerRow = 150;
23  private readonly timestampCharsPerRow = 20;
24  private readonly sourceFileCharsPerRow = 50;
25
26  protected override predictScrollItemHeight(message: UiDataMessage): number {
27    const textHeight = this.subItemHeight(message.text, this.textCharsPerRow);
28    const timestampHeight = this.subItemHeight(
29      message.time.formattedValue(),
30      this.timestampCharsPerRow,
31    );
32    const sourceFileHeight = this.subItemHeight(
33      message.at,
34      this.sourceFileCharsPerRow,
35    );
36    return Math.max(textHeight, timestampHeight, sourceFileHeight);
37  }
38}
39