JUCE/modules/juce_gui_extra/native/juce_SystemTrayIcon_linux.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.

   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

class SystemTrayIconComponent::Pimpl
{
public:
    Pimpl (const Image& im, Window windowH)  : image (im)
    {
        XWindowSystemUtilities::ScopedXLock xLock;

        auto* display = XWindowSystem::getInstance()->getDisplay();

        auto* screen = X11Symbols::getInstance()->xDefaultScreenOfDisplay (display);
        auto screenNumber = X11Symbols::getInstance()->xScreenNumberOfScreen (screen);

        String screenAtom ("_NET_SYSTEM_TRAY_S");
        screenAtom << screenNumber;
        Atom selectionAtom = XWindowSystemUtilities::Atoms::getCreating (display, screenAtom.toUTF8());

        X11Symbols::getInstance()->xGrabServer (display);
        auto managerWin = X11Symbols::getInstance()->xGetSelectionOwner (display, selectionAtom);

        if (managerWin != None)
            X11Symbols::getInstance()->xSelectInput (display, managerWin, StructureNotifyMask);

        X11Symbols::getInstance()->xUngrabServer (display);
        X11Symbols::getInstance()->xFlush (display);

        if (managerWin != None)
        {
            XEvent ev = { 0 };
            ev.xclient.type = ClientMessage;
            ev.xclient.window = managerWin;
            ev.xclient.message_type = XWindowSystemUtilities::Atoms::getCreating (display, "_NET_SYSTEM_TRAY_OPCODE");
            ev.xclient.format = 32;
            ev.xclient.data.l[0] = CurrentTime;
            ev.xclient.data.l[1] = 0 /*SYSTEM_TRAY_REQUEST_DOCK*/;
            ev.xclient.data.l[2] = (long) windowH;
            ev.xclient.data.l[3] = 0;
            ev.xclient.data.l[4] = 0;

            X11Symbols::getInstance()->xSendEvent (display, managerWin, False, NoEventMask, &ev);
            X11Symbols::getInstance()->xSync (display, False);
        }

        // For older KDE's ...
        long atomData = 1;
        Atom trayAtom = XWindowSystemUtilities::Atoms::getCreating (display, "KWM_DOCKWINDOW");
        X11Symbols::getInstance()->xChangeProperty (display, windowH, trayAtom, trayAtom,
                                                    32, PropModeReplace, (unsigned char*) &atomData, 1);

        // For more recent KDE's...
        trayAtom = XWindowSystemUtilities::Atoms::getCreating (display, "_KDE_NET_WM_SYSTEM_TRAY_WINDOW_FOR");
        X11Symbols::getInstance()->xChangeProperty (display, windowH, trayAtom, XA_WINDOW,
                                                    32, PropModeReplace, (unsigned char*) &windowH, 1);

        // A minimum size must be specified for GNOME and Xfce, otherwise the icon is displayed with a width of 1
        if (auto* hints = X11Symbols::getInstance()->xAllocSizeHints())
        {
            hints->flags = PMinSize;
            hints->min_width = 22;
            hints->min_height = 22;
            X11Symbols::getInstance()->xSetWMNormalHints (display, windowH, hints);
            X11Symbols::getInstance()->xFree (hints);
        }
    }

    Image image;

private:
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Pimpl)
};


//==============================================================================
void SystemTrayIconComponent::setIconImage (const Image& colourImage, const Image&)
{
    pimpl.reset();

    if (colourImage.isValid())
    {
        if (! isOnDesktop())
            addToDesktop (0);

        pimpl.reset (new Pimpl (colourImage, (Window) getWindowHandle()));

        setVisible (true);
        toFront (false);
    }

    repaint();
}

void SystemTrayIconComponent::paint (Graphics& g)
{
    if (pimpl != nullptr)
        g.drawImage (pimpl->image, getLocalBounds().toFloat(),
                     RectanglePlacement::xLeft | RectanglePlacement::yTop | RectanglePlacement::onlyReduceInSize);
}

void SystemTrayIconComponent::setIconTooltip (const String& /*tooltip*/)
{
    // xxx Not implemented!
}

void SystemTrayIconComponent::setHighlighted (bool)
{
    // xxx Not implemented!
}

void SystemTrayIconComponent::showInfoBubble (const String& /*title*/, const String& /*content*/)
{
    // xxx Not implemented!
}

void SystemTrayIconComponent::hideInfoBubble()
{
    // xxx Not implemented!
}

void* SystemTrayIconComponent::getNativeHandle() const
{
    return getWindowHandle();
}

} // namespace juce