Fix landscape mode on desktop

I accidentally broke it when removing safe area handling in a previous
commit. Now the code is also free of private header usage.

Author: MartinBriza

modules/Lith/Core/windowhelper.cpp

@@ -6,8 +6,6 @@
 #include <QPalette>
 #include <QtMath>
 
-#include <QtGui/qpa/qplatformwindow.h>
-
 #include <cmath>
 
 WindowHelper::WindowHelper()
@@ -61,6 +59,16 @@ void WindowHelper::changeScheme() {
     qApp->setPalette(currentTheme().palette());
 }
 
+void WindowHelper::handleWindowChange() {
+    if (!m_window) {
+        return;
+    }
+    if (LithPlatform::instance()->isDesktop()) {
+        bool isLandscape = m_window->width() > m_window->height();
+        landscapeModeSet(isLandscape);
+    }
+}
+
 const ColorTheme& WindowHelper::currentTheme() const {
     if (m_darkTheme) {
         if (m_useBlack) {

modules/Lith/Core/windowhelper.h

@@ -21,6 +21,8 @@ class LITHCORE_EXPORT WindowHelper : public QObject {
 public:
     static WindowHelper* instance();
     static WindowHelper* create(QQmlEngine* qmlEngine, QJSEngine* jsEngine) {
+        Q_UNUSED(qmlEngine);
+        Q_UNUSED(jsEngine);
         return instance();
     }
 
@@ -31,10 +33,14 @@ class LITHCORE_EXPORT WindowHelper : public QObject {
     const ColorTheme& inverseTheme() const;
     QString currentThemeName() const;
 
+public slots:
+    void connectToWindow(QQuickWindow* window);
+
 private slots:
     void init();
     void prepareToChangeScheme();
     void changeScheme();
+    void handleWindowChange();
 
 signals:
     void themeChanged();
@@ -43,6 +49,7 @@ private slots:
     explicit WindowHelper();
     void detectSystemDarkStyle();
 
+    QPointer<QQuickWindow> m_window = nullptr;
     QTimer* m_changeSchemeTimer = nullptr;
     bool m_systemPrefersDarkStyle = false;
 };

modules/Lith/UI/MainView.qml

@@ -16,6 +16,10 @@ Item {
     implicitWidth: LithPlatform.mobile ? 480 : 1024
     implicitHeight: 800
 
+    Component.onCompleted: {
+        WindowHelper.connectToWindow(Window.window)
+    }
+
     property real topMargin: {
         if (LithPlatform.mobile) {
             if (Qt.inputMethod && Qt.inputMethod.keyboardRectangle && Qt.inputMethod.visible) {

modules/Lith/UI/util/DebugWindow.qml

@@ -25,20 +25,6 @@ Window {
             PaletteSwitch {
                 text: "Switch theme"
             }
-            TextField {
-                placeholderText: "Set all margins to"
-                implicitWidth: 192
-                validator: IntValidator {
-
-                }
-                onAccepted: {
-                    WindowHelper.safeAreaMargins.left = text
-                    WindowHelper.safeAreaMargins.right = text
-                    WindowHelper.safeAreaMargins.top = text
-                    WindowHelper.safeAreaMargins.bottom = text
-                    text = ""
-                }
-            }
             TextField {
                 placeholderText: "Set error string"
                 implicitWidth: 192
@@ -53,29 +39,6 @@ Window {
                 onCheckedChanged: mainView.safeAreaBoundaryCovers = checked
             }
         }
-        RowLayout {
-            Layout.fillWidth: true
-            Label {
-                text: "Safe Area:"
-            }
-            GridLayout {
-                Layout.fillWidth: true
-                columns: 4
-                Repeater {
-                    model: ["left", "right", "top", "bottom"]
-                    Label {
-                        text: modelData
-                    }
-                }
-                Repeater {
-                    model: ["left", "right", "top", "bottom"]
-                    SpinBox {
-                        value: WindowHelper.safeAreaMargins[modelData]
-                        onValueChanged: WindowHelper.safeAreaMargins[modelData] = value
-                    }
-                }
-            }
-        }
     }
     SettingsDialogContents {
         id: settings