我刚接触QT,需要使用app-indicator构建一个应用程序。由于QT比GTK+更容易,所以我选择在QT中制作。
值得一提的是,我已经安装了sni-qt,并且VLC和Skype的应用程序指示器正常显示在面板上。我正在使用Ubuntu 13.04 64位的QT5。
我按照这个教程逐步操作:http://qt-project.org/doc/qt-4.8/desktop-systray.html
但是当我运行它时,它会出现以下情况(十字架是我使用的图标):
我该如何修复这个问题?
我刚接触QT,需要使用app-indicator构建一个应用程序。由于QT比GTK+更容易,所以我选择在QT中制作。
值得一提的是,我已经安装了sni-qt,并且VLC和Skype的应用程序指示器正常显示在面板上。我正在使用Ubuntu 13.04 64位的QT5。
我按照这个教程逐步操作:http://qt-project.org/doc/qt-4.8/desktop-systray.html
但是当我运行它时,它会出现以下情况(十字架是我使用的图标):
我该如何修复这个问题?
很抱歉,目前sni-qt不支持Qt5,因此您必须等待新版本支持它,或者按照这个指南使用gtk+和libappindicator编写代码。甚至有各种语言的示例可供参考。由于Qt5也分发GLib事件,因此使集成变得更加容易。首先,您需要找出自己是否在Unity上运行(以支持除Unity之外的更多桌面),可以通过检索XDG_CURRENT_DESKTOP环境变量并检查其是否返回Unity来实现,如果是,则创建appindicator,否则创建QSystemTrayIcon。
首先,您需要包含所需的头文件:
#undefine signals
extern "C" {
#include <libappindicator/app-indicator.h>
#include <gtk/gtk.h>
}
#define signals public
由于app-indicator直接使用“signals”名称,我们需要取消定义默认的Qt“关键字”信号,该信号通常被翻译为public。然后,由于我们编写的是C++代码,而libappindicator是用C编写的,因此我们需要使用extern "C"来避免使用C++名称重整。
接下来根据我们所在的桌面环境创建AppIndicator/QSystemTrayIcon。
QString desktop;
bool is_unity;
desktop = getenv("XDG_CURRENT_DESKTOP");
is_unity = (desktop.toLower() == "unity");
if (is_unity) {
AppIndicator *indicator;
GtkWidget *menu, *item;
menu = gtk_menu_new();
item = gtk_menu_item_new_with_label("Quit");
gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
g_signal_connect(item, "activate",
G_CALLBACK(quitIndicator), qApp); // We cannot connect
// gtk signal and qt slot so we need to create proxy
// function later on, we pass qApp pointer as an argument.
// This is useful when we need to call signals on "this"
//object so external function can access current object
gtk_widget_show(item);
indicator = app_indicator_new(
"unique-application-name",
"indicator-messages",
APP_INDICATOR_CATEGORY_APPLICATION_STATUS
);
app_indicator_set_status(indicator, APP_INDICATOR_STATUS_ACTIVE);
app_indicator_set_menu(indicator, GTK_MENU(menu));
} else {
QSystemTrayIcon *icon;
QMenu *m = new QMenu();
m->addAction(tr("Quit"), qApp, SLOT(quit()));
}
最后,我们创建了代理函数来调用Qt信号。为了声明该函数,我们需要使用extern "C",这样就不会有任何未定义的行为。
extern "C" {
void quitIndicator(GtkMenu *, gpointer);
}
现在是代理函数:
void quitIndicator(GtkMenu *menu, gpointer data) {
Q_UNUSED(menu);
QApplication *self = static_cast<QApplication *>(data);
self->quit();
}
想要补充一点,对于使用Qt并试图在Ubuntu 13+中显示应用程序指示器的任何人,正如其他人所提到的,sni-qt不起作用,我能够使用上面的回复来制作一个工作的Qt应用程序,仍在努力让图标更改并显示弹出消息,但这是一个很好的开始,一旦我让图标和消息正常工作,我可能会将其发布在我的网站Voidrealms.com上:
确保执行sudo apt-get install libappindicator-dev
创建一个带有QDialog的新项目,并按照下面所示进行修改:
Pro文件:
#-------------------------------------------------
#
# Project created by QtCreator 2014-03-28T20:34:54
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = PluginServiceGUI
TEMPLATE = app
# includes for the libappindicator
# /usr/lib/x86_64-linux-gnu libglib-2.0.a
INCLUDEPATH += "/usr/include/libappindicator-0.1"
INCLUDEPATH += "/usr/include/gtk-2.0"
INCLUDEPATH += "/usr/include/glib-2.0"
INCLUDEPATH += "/usr/lib/x86_64-linux-gnu/glib-2.0/include"
INCLUDEPATH += "/usr/include/cairo"
INCLUDEPATH += "/usr/include/pango-1.0"
INCLUDEPATH += "/usr/lib/x86_64-linux-gnu/gtk-2.0/include"
INCLUDEPATH += "/usr/include/gdk-pixbuf-2.0"
INCLUDEPATH += "/usr/include/atk-1.0"
LIBS += -L/usr/lib/x86_64-linux-gnu -lgobject-2.0
LIBS += -L/usr/lib/x86_64-linux-gnu -lappindicator
LIBS += -L/usr/lib/x86_64-linux-gnu -lgtk-x11-2.0
#These seem to not be needed
#LIBS += -L/usr/lib/x86_64-linux-gnu -lcairo
#LIBS += -L/usr/lib/x86_64-linux-gnu -lpango-1.0
#LIBS += -L/usr/lib/x86_64-linux-gnu -lglib-2.0
# end incudes for libappindicator
SOURCES += main.cpp\
dialog.cpp
HEADERS += dialog.h
FORMS += dialog.ui
RESOURCES += \
resources.qrc
#include "dialog.h"
#include <QApplication>
#include <QtGui>
#include <QSystemTrayIcon>
#include <QMessageBox>
#include <QSystemTrayIcon>
#include <QMenu>
// https://dev59.com/kmQm5IYBdhLWcg3w-i9L
// requires libappindicator-dev
// sudo apt-get install libappindicator-dev
// installs the headers in: /usr/include/libappindicator-0.1/libappindicator
#undef signals
extern "C" {
#include <libappindicator/app-indicator.h>
#include <gtk/gtk.h>
void quitIndicator(GtkMenu *, gpointer);
}
#define signals public
void quitIndicator(GtkMenu *menu, gpointer data) {
Q_UNUSED(menu);
QApplication *self = static_cast<QApplication *>(data);
self->quit();
}
void ShowUnityAppIndicator()
{
AppIndicator *indicator;
GtkWidget *menu, *item;
menu = gtk_menu_new();
item = gtk_menu_item_new_with_label("Quit");
gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
g_signal_connect(item, "activate",
G_CALLBACK(quitIndicator), qApp); // We cannot connect
// gtk signal and qt slot so we need to create proxy
// function later on, we pass qApp pointer as an argument.
// This is useful when we need to call signals on "this"
//object so external function can access current object
gtk_widget_show(item);
indicator = app_indicator_new(
"unique-application-name",
"indicator-messages",
APP_INDICATOR_CATEGORY_APPLICATION_STATUS
);
app_indicator_set_status(indicator, APP_INDICATOR_STATUS_ACTIVE);
app_indicator_set_menu(indicator, GTK_MENU(menu));
}
void ShowQtSysTray(QApplication* app, QDialog* dialog)
{
Q_INIT_RESOURCE(resources);
if (!QSystemTrayIcon::isSystemTrayAvailable()) {
QMessageBox::critical(0, QObject::tr("Systray"),
QObject::tr("I couldn't detect any system tray "
"on this system."));
}
QApplication::setQuitOnLastWindowClosed(false);
QSystemTrayIcon* trayIcon = new QSystemTrayIcon(dialog);
QAction* Action = new QAction("hello", dialog);
QMenu* trayIconMenu = new QMenu(dialog);
trayIconMenu->addAction("Quit", app, SLOT(quit()));
trayIconMenu->addAction(Action);
trayIcon->setContextMenu(trayIconMenu);
trayIcon->setIcon(QIcon (":/icons/Icons/accept.png"));
trayIcon->show();
trayIcon->showMessage("Title","Message");
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
//Determine the desktop type
QString desktop;
bool is_unity;
desktop = getenv("XDG_CURRENT_DESKTOP");
is_unity = (desktop.toLower() == "unity");
if(is_unity)
{
ShowUnityAppIndicator();
}
else
{
//Show the SystemTrayIcon the Qt way
ShowQtSysTray(&a, &w);
}
// w.show();
return a.exec();
}