Add macOS specific Outline

source/shared/ui/qml/app/graphia/Shared/Controls/+macos/Outline.qml

@@ -0,0 +1,69 @@
+/* Copyright © 2013-2023 Graphia Technologies Ltd.
+ *
+ * This file is part of Graphia.
+ *
+ * Graphia is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Graphia is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Graphia.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import QtQuick
+
+import app.graphia
+import app.graphia.Shared.Controls
+
+// The Rectangle based implementation of Outline can't render half pixel widths
+// that you see on Retina displays, so on macOS we do it manually using a Canvas
+
+Canvas
+{
+    id: root
+
+    property bool outlineVisible: true
+    readonly property real outlineWidth: outlineVisible ? 1 : 0
+    property color color: ControlColors.outline
+
+    clip: outlineVisible
+
+    onPaint: function(rect)
+    {
+        let context = getContext("2d");
+        context.clearRect(0, 0, width, height);
+
+        if(!outlineVisible)
+            return;
+
+        context.beginPath();
+
+        context.strokeStyle = root.color;
+        context.lineWidth = 1.0 / Screen.devicePixelRatio;
+
+        context.moveTo(0, 0);
+        context.lineTo(width, 0);
+        context.lineTo(width, height);
+        context.lineTo(0, height);
+        context.lineTo(0, 0);
+
+        context.closePath();
+
+        context.stroke();
+    }
+
+    onOutlineVisibleChanged: { requestPaint(); }
+    onColorChanged: { requestPaint(); }
+    PaletteChangeNotifier { onPaletteChanged: { parent.requestPaint(); } }
+    Connections
+    {
+        target: Screen
+        function onDevicePixelRatioChanged() { parent.requestPaint(); }
+    }
+}

source/shared/ui/shared.qrc

@@ -11,6 +11,7 @@
         <file>qml/app/graphia/Shared/Controls/ListTabView.qml</file>
         <file>qml/app/graphia/Shared/Controls/NodeAttributeTableView.qml</file>
         <file>qml/app/graphia/Shared/Controls/Outline.qml</file>
+        <file>qml/app/graphia/Shared/Controls/+macos/Outline.qml</file>
         <file>qml/app/graphia/Shared/Controls/PlatformMenuItem.qml</file>
         <file>qml/app/graphia/Shared/Controls/PlatformMenu.qml</file>
         <file>qml/app/graphia/Shared/Controls/PlatformMenuBar.qml</file>