Window Manager

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Introduction

Window management is one of the services in the openvela operating system, mainly responsible for input management, output management, and display management.

Architecture

Figure 1 Window management service architecture

• Window Manager

  The client-side window management of the application runs in the application user space, responsible for window management and rendering within the application, and passes the rendered image to the server.

• Window Manager Server

  The server-side window management service runs as a core system capability in the kernel system service process, responsible for window management, scheduling, and composition between applications.

Features

• Window attribute and style management: including adjusting window position, size, and transparency.
• Window lifecycle management: including creating, displaying, hiding, and deleting windows.
• Event listening management.
• Window transition animation management.

Directory

├── app
├── common
├── config
├── include
├── Kconfig
├── server
└── test

Constraints

• The .Kconfig file is used to configure compilation options for the window management service.
• Language version: C++11 or higher.
• Dependencies: openvela Core service.

Usage

The following lists the basic usage of window management on the native application side.

Get window management service

To get an instance of the window management service, use the following code:

WindowManager windowManager = (WindowManager) getService(WindowManager::name());

Create a window

Use WindowManager.LayoutParams to create a window, as shown below:

WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION;
layoutParams.format = PixelFormat.FORMAT_RGB_888;
layoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
layoutParams.height = WindowManager.LayoutParams.MATCH_PARENT;
layoutParams.x = 0;
layoutParams.y = 0;
layoutParams.windowTransitionState = WindowManager.LayoutParams.WINDOW_TRANSITION_ENABLE;

BaseWindow window = new BaseWindow(context, this);
windowManager.addWindow(window, layoutParams, visibility);

The above code creates a window for the application and adds it to the window list managed by the window management service.

Modify window attributes

To modify the window attributes, use the following code:

WindowManager.LayoutParams layoutParams = getWindow().getLayoutParams();
layoutParams.x = 200;
layoutParams.y = 200;
getWindow().setLayoutParams(layoutParams);

The above code changes the window position of the current activity to (200, 200).

Delete the window

To delete the window, use the following code:

windowManager.removeWindow(window);