1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16import { Log } from '../../utils/Log';
17import { Dispatch, OhCombinedState } from '../../redux/store';
18import { getStore } from '../../redux/store';
19
20class StateStruct {
21  xComponentWidth: number = 0;
22  xComponentHeight: number = 0;
23}
24
25class AssistiveGridViewDispatcher {
26  private mDispatch: Dispatch = (data) => data;
27
28  public setDispatch(dispatch: Dispatch) {
29    this.mDispatch = dispatch;
30  }
31}
32
33@Component
34export struct AssistiveGridView {
35  private TAG: string = '[AssistiveGridView]:';
36  private mGlobalAlpha: number = 0.5;
37  private mLineWidth: number = 0.5;
38  private mShadowColor: string = 'argb(#7F000000)';
39  private mShadowOffsetX: number = 0;
40  private mShadowOffsetY: number = 0;
41  private mStrokeStyle: string = '#FFFFFF';
42  private scaleLen: number = 4;
43  private settings: RenderingContextSettings = new RenderingContextSettings(true);
44  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings);
45  private mAction: AssistiveGridViewDispatcher = new AssistiveGridViewDispatcher();
46  @State state: StateStruct = new StateStruct();
47
48  aboutToAppear(): void {
49    Log.info(`${this.TAG} aboutToAppear invoke E`);
50    getStore().subscribe((state: OhCombinedState) => {
51      this.state = {
52        xComponentWidth: state.previewReducer.xComponentWidth,
53        xComponentHeight: state.previewReducer.xComponentHeight
54      };
55    }, (dispatch: Dispatch) => {
56      this.mAction.setDispatch(dispatch);
57    });
58    Log.info(`${this.TAG} aboutToAppear invoke X`)
59  }
60
61  build() {
62    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
63      Canvas(this.context)
64        .width('100%')
65        .height('100%')
66        .onReady(() => {
67          this.context.clearRect(0, 0, this.state.xComponentWidth, this.state.xComponentHeight)
68          this.drawRuler()
69        })
70    }
71    .width(this.state.xComponentWidth)
72    .height(this.state.xComponentHeight)
73  }
74
75  drawRuler(): void {
76    let xCWidth = this.state.xComponentWidth
77    let xCHeight = this.state.xComponentHeight
78    let curX = xCWidth / 3
79    let curY = xCHeight / 3
80    this.context.beginPath()
81    this.context.globalAlpha = this.mGlobalAlpha
82    this.context.lineWidth = this.mLineWidth
83    this.context.strokeStyle = this.mStrokeStyle
84    this.context.shadowColor = this.mShadowColor
85    this.context.shadowOffsetX = this.mShadowOffsetX
86    this.context.shadowOffsetY = this.mShadowOffsetY
87    for (let i = 1; i <= this.scaleLen; i++) {
88      if (i <= this.scaleLen / 2) {
89        this.context.moveTo(curX * i, 0)
90        this.context.lineTo(curX * i, xCHeight)
91      } else {
92        let n = Math.floor(i / 2)
93        this.context.moveTo(0, curY * n)
94        this.context.lineTo(xCWidth * n, curY * n)
95      }
96    }
97    this.context.closePath()
98    this.context.stroke()
99  }
100}