Frameless window

A frameless window is a window that has no chrome.

Create a frameless window

To create a frameless window, you only need to specify frame to false in BrowserWindow's options:

var BrowserWindow = require('browser-window');
var win = new BrowserWindow({ width: 800, height: 600, frame: false });

Transparent window

By setting the transparent option to true, you can also make the frameless window transparent:

var win = new BrowserWindow({ transparent: true, frame: false });

Limitations

You can not click through the transparent area, we are going to introduce an API to set window shape to solve this, but currently blocked at an upstream bug.
Transparent window is not resizable, setting resizable to true may make transparent window stop working on some platforms.
The blur filter only applies to the web page, so there is no way to apply blur effect to the content below the window.
On Windows transparent window will not work when DWM is disabled.
On Linux users have to put --enable-transparent-visuals --disable-gpu in command line to disable GPU and allow ARGB to make transparent window, this is caused by an upstream bug that alpha channel doesn't work on some NVidia drivers on Linux.
On Mac the native window shadow will not show for transparent window.

Draggable region

By default, the frameless window is non-draggable. Apps need to specify -webkit-app-region: drag in CSS to tell Electron which regions are draggable (like the OS's standard titlebar), and apps can also use -webkit-app-region: no-drag to exclude the non-draggable area from the draggable region. Note that only rectangular shape is currently supported.

To make the whole window draggable, you can add -webkit-app-region: drag as body's style:

<body style="-webkit-app-region: drag">
</body>

And note that if you have made the whole window draggable, you must also mark buttons as non-draggable, otherwise it would be impossible for users to click on them:

button {
  -webkit-app-region: no-drag;
}

If you're only using a custom titlebar, you also need to make buttons in titlebar non-draggable.

Text selection

One thing on frameless window is that the dragging behaviour may conflict with selecting text, for example, when you drag the titlebar, you may accidentally select the text on titlebar. To prevent this, you need to disable text selection on dragging area like this:

.titlebar {
  -webkit-user-select: none;
  -webkit-app-region: drag;
}

On some platforms, the draggable area would be treated as non-client frame, so when you right click on it a system menu would be popuped. To make context menu behave correctly on all platforms, you should never custom context menu on draggable areas.

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