LXQt application switcher

Overview

LXQt application switcher is an application switcher, hence a tool to change the active window by cycling through the available ones, geared towards the LXQt desktop environment.

It integrates with LXQt including theming and is meant to be more configurable and featureful than e. g. its counterpart provided by Openbox.
(For now theme Ambiance only is supported. Other themes can still be used but make LXQt application switcher fall back to a default theme.)

Installation

LXQt component lxqt-globalkeys is the only mandatory build- and runtime dependency as it's needed itself and pulls all other needed dependencies including Qt as well.

LXQt application switcher is relying on CMake and can hence be installed by running cmake, make and make install, optionally from a dedicated build directory.
A CMake option like -DCMAKE_INSTALL_PREFIX=/usr will be needed most of the time to have the program installed at paths commonly used these days.

In Arch Linux the tool can be installed via AUR package lxqt-appswitcher-git.

Configuration

Keyboard shortcuts

LXQt application switcher is using the shortcuts defined by lxqt-globalkeys.
These are configured in dialogue "Global Actions Manager" (binary lxqt-config-globalkeyshortcuts) - topics "[reverse] switch applications" in column "Description". Default settings are Alt+Tab and Alt+Shift+Tab to cycle in regular and reverse order respectively.

It must be ensured that these shortcuts aren't used by the window manager. (Technically it's possible to assign different shortcuts to LXQt application switcher and e. g. an application switcher of a window manager and hence use the two in parallel. This will hardly ever make sense, though.)
In Openbox actions NextWindow and/or PreviousWindow have to be detached from the keyboard bindings. This is best done by uncommenting or removing the corresponding sections in ~/.config/openbox/rc.xml. If the file is missing /etc/xdg/openbox/rc.xml can be copied and used as template, the sections themselves will look like

<keybind key="A-Tab">
    <action name="NextWindow">
[...]
</keybind>

and

<keybind key="A-S-Tab">
    <action name="PreviousWindow">
[...]
</keybind>

For changes to take effect either start a new session or run openbox --reconfigure.
In KWin the shortcuts can be handled from KDE's "System Settings" (binary systemsettings[5]) under Workspace - Window Management - Task Switcher, using Xfwm4 in dialogue "Window Manager" (binary xfwm4-settings), both times changes take effect at once.

Auto start

The application itself is run as so-called LXQt Module. As such it has to be enabled from dialogue "LXQt Session Settings" (binary lxqt-config-session).

Settings

The actual configuration can be tweaked by dialogue "Application switcher" which can be found in LXQt's main panel menu as well as in the "LXQt Configuration Center".