harmony 鸿蒙Window Management Development

2023-06-24
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Window Management Development

How do I obtain the height of the status bar and navigation bar?

Applicable to: OpenHarmony 3.2 Beta5 (API version 9)

Solution

Before the window content is loaded, enable listening for the systemAvoidAreaChange event.

Example

// MainAbility.ts
import window from '@ohos.window';

/**
 * Set the immersive window and obtain the height of the status bar and navigation bar.
 * @param mainWindow Indicates the main window.
 */
async function enterImmersion(mainWindow: window.Window) { 
  mainWindow.on("systemBarTintChange", (data) => {
    let avoidAreaRect = data.regionTint[0].region; // data.regionTint is an array that contains the rectangle coordinates of the status bar and navigation bar.
  })
  await mainWindow.setFullScreen(true)
  await mainWindow.setSystemBarEnable(["status", "navigation"])
  await mainWindow.systemBarProperties({
    navigationBarColor: "#00000000",
    statusBarColor: "#00000000",
    navigationBarContentColor: "#FF0000",
    statusBarContentColor: "#FF0000"
  })
}
export default class MainAbility extends Ability {
  // Do something.
  async onWindowStageCreate(windowStage: window.WindowStage) {
    let mainWindow = await windowStage.getMainWindow()
    await enterImmersion(mainWindow)
    windowStage.loadContent('pages/index')
  }
  // Do something.
}

How do I hide the status bar on the top of an application?

Applicable to: OpenHarmony 3.2 Beta5 (API version 9)

Solution

Use setWindowSystemBarEnable in the onWindowStageCreate lifecycle callback of UIAbility.

Example

onWindowStageCreate(windowStage){
  windowStage.getMainWindowSync().setWindowSystemBarEnable([])
  ......
}

Reference

Window

How do I lock the window in portrait mode so that it does not rotate with the device?

Applicable to: OpenHarmony SDK 3.2 Beta5 (API version 9, stage model)

Solution

To lock the window in portrait mode, call setPreferredOrientation of the window module, with orientation set to window.Orientation.PORTRAIT.

Example

import window from "@ohos.window";
// 1. Obtain a Window instance. Specifically, you can call createWindow to create a window or findWindow to obtain an existing window.
let windowClass = null;
let config = {name: "alertWindow", windowType: window.WindowType.TYPE_SYSTEM_ALERT, ctx: this.context};
try {
    let promise = window.createWindow(config);
    promise.then((data)=> {
        windowClass = data;
        console.info('Succeeded in creating the window. Data:' + JSON.stringify(data));
    }).catch((err)=>{
        console.error('Failed to create the Window. Cause:' + JSON.stringify(err));
    });} catch (exception) {
    console.error('Failed to create the window. Cause: ' + JSON.stringify(exception));
}
// 2. Call setPreferredOrientation to set the window orientation. The value PROTRAIT indicates that the window is displayed in portrait mode.
let orientation = window.Orientation.PORTRAIT;
if (windowClass) {
    windowClass.setPreferredOrientation(orientation, (err) => {
        if (err.code) {
            console.error('Failed to set window orientation. Cause: ' + JSON.stringify(err));
            return;
        }
        console.info('Succeeded in setting window orientation.');
}

Reference

window.Orientation

Why do the isStatusBarLightIcon and isNavigationBarLightIcon attributes set by calling setWindowSystemBarProperties not take effect?

Applicable to: OpenHarmony SDK 3.2 Beta5 (API version 9, stage model)

Solution

In effect, the isStatusBarLightIcon and isNavigationBarLightIcon attributes turn the font white when set to true. If statusBarContentColor is also set in setWindowSystemBarProperties, the isStatusBarLightIcon attribute does not take effect. Similarly, if navigationBarContentColor is set, the isNavigationBarLightIcon attribute does not take effect.

Reference

window.SystemBarProperties

How do I keep the screen always on?

Applicable to: OpenHarmony 3.2 Beta5 (API version 9)

Solution

Obtain a Window instance, and call setWindowKeepScreenOn to keep the screen always on.

let isKeepScreenOn = true;
try {
    windowClass.setWindowKeepScreenOn(isKeepScreenOn, (err) => {
        if (err.code) {
            console.error('Failed to set the screen to be always on. Cause: ' + JSON.stringify(err));
            return;
        }
        console.info('Succeeded in setting the screen to be always on.');
    });
} catch (exception) {
    console.error('Failed to set the screen to be always on. Cause: ' + JSON.stringify(exception));
}

How do I listen for window size changes?

Applicable to: OpenHarmony 3.2 Beta5 (API version 9)

Solution

Obtain a Window instance, and call on(‘windowSizeChange’) to listen for window size changes.

try {
    windowClass.on('windowSizeChange', (data) => {
        console.info('Succeeded in enabling the listener for window size changes. Data: ' + JSON.stringify(data)); 
   });
} catch (exception) {
    console.error('Failed to enable the listener for window size changes. Cause: ' + JSON.stringify(exception));
}

Reference

window.on(“windowSizeChange”)