Allow using QGuiApplication and not linking to QtWidgets

README.md

@@ -108,6 +108,12 @@ Enables `QtWebEngine` functionality. For more details see the [example](./exampl
 
 This feature is disabled by default.
 
+### `widgets`
+
+Link against **`qtwidgets`** module. This will use `QApplication` instead of `QGuiApplication`. 
+
+This feature is enabled by default.
+
 ## What if a wrapper for the Qt C++ API is missing?
 
 It is quite likely that you would like to call a particular Qt function which

qmetaobject/Cargo.toml

@@ -12,9 +12,10 @@ keywords = ["Qt", "QML", "QMetaObject",]
 repository = "https://github.com/woboq/qmetaobject-rs"
 
 [features]
-default = ["log"]
+default = ["log", "widgets"]
 chrono_qdatetime = ["qttypes/chrono"]
 webengine = ["qttypes/qtwebengine"]
+widgets = ["qttypes/qtwidgets"]
 
 [dependencies]
 qttypes = { path = "../qttypes", version = "0.2.4", features = ["qtquick"] }

qmetaobject/build.rs

@@ -33,6 +33,9 @@ fn main() {
         config.flag("-F");
         config.flag(&qt_library_path);
     }
+    if cfg!(not(feature = "widgets")) {
+        config.flag("-DNO_WIDGETS");
+    }
     if qt_version >= Version::new(6, 0, 0) {
         config.flag_if_supported("-std=c++17");
         config.flag_if_supported("/std:c++17");

qmetaobject/src/qtdeclarative.rs

@@ -28,8 +28,15 @@ cpp! {{
     #include <memory>
     #include <QtQuick/QtQuick>
     #include <QtCore/QDebug>
-    #include <QtWidgets/QApplication>
     #include <QtQml/QQmlComponent>
+
+    #ifdef NO_WIDGETS
+    # define QAPPLICATION QGuiApplication
+    # include <QtGui/QGuiApplication>
+    #else
+    # define QAPPLICATION QApplication
+    # include <QtWidgets/QApplication>
+    #endif
 
     struct SingleApplicationGuard {
         SingleApplicationGuard() {
@@ -47,12 +54,12 @@ cpp! {{
     };
 
     struct QmlEngineHolder : SingleApplicationGuard {
-        std::unique_ptr<QApplication> app;
+        std::unique_ptr<QAPPLICATION> app;
         std::unique_ptr<QQmlApplicationEngine> engine;
         std::unique_ptr<QQuickView> view;
 
         QmlEngineHolder(int &argc, char **argv)
-            : app(new QApplication(argc, argv))
+            : app(new QAPPLICATION(argc, argv))
             , engine(new QQmlApplicationEngine())
         {}
     };

qttypes/Cargo.toml

@@ -31,8 +31,10 @@ qtmultimediawidgets = []
 qtsql = []
 # Link against QtTest
 qttest = []
+# Link against QtWidgets
+qtwidgets = []
 
-default = ["required"]
+default = ["required", "qtwidgets"]
 
 [dependencies]
 cpp = "0.5.6"

qttypes/build.rs

@@ -201,6 +201,7 @@ fn main() {
     };
     link_lib("Core");
     link_lib("Gui");
+    #[cfg(feature = "qtwidgets")]
     link_lib("Widgets");
     #[cfg(feature = "qtquick")]
     link_lib("Quick");
@@ -218,7 +219,7 @@ fn main() {
     link_lib("QuickControls2");
     #[cfg(feature = "qtmultimedia")]
     link_lib("Multimedia");
-    #[cfg(feature = "qtmultimediawidgets")]
+    #[cfg(all(feature = "qtmultimediawidgets", feature = "qtwidgets"))]
     link_lib("MultimediaWidgets");
     #[cfg(feature = "qtsql")]
     link_lib("Sql");

qttypes/src/lib.rs

@@ -116,6 +116,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //! | **`qtsql`**               | Qt SQL                |
 //! | **`qttest`**              | Qt Test               |
 //! | **`qtwebengine`**         | Qt WebEngine          |
+//! | **`qtwidgets`**           | Qt Widgets            |
 //!
 
 #![cfg_attr(no_qt, allow(unused))]