[ui] add palette variation for dark theme

Crtl+Shift+P allows to toggle between light and dark theme on the fly

meshroom/ui/__main__.py

@@ -1,8 +1,8 @@
 import os
 import sys
 
-from PySide2.QtCore import Qt
-from PySide2.QtGui import QGuiApplication
+from PySide2.QtCore import Qt, QObject, Slot
+from PySide2.QtGui import QGuiApplication, QPalette, QColor, QIcon
 
 from meshroom.ui.reconstruction import Reconstruction
 from meshroom.ui.utils import QmlInstantEngine
@@ -10,10 +10,60 @@ from meshroom.ui.utils import QmlInstantEngine
 from meshroom.ui import components
 
 
+class PaletteManager(QObject):
+
+    def __init__(self, qmlEngine, parent=None):
+        super(PaletteManager, self).__init__(parent)
+        self.qmlEngine = qmlEngine
+        darkPalette = QPalette()
+        window = QColor(50, 52, 55)
+        text = QColor(200, 200, 200)
+        disabledText = text.darker(170)
+        base = window.darker(150)
+        button = window.lighter(115)
+        dark = window.darker(170)
+
+        darkPalette.setColor(QPalette.Window, window)
+        darkPalette.setColor(QPalette.WindowText, text)
+        darkPalette.setColor(QPalette.Disabled, QPalette.WindowText, disabledText)
+        darkPalette.setColor(QPalette.Base, base)
+        darkPalette.setColor(QPalette.AlternateBase, QColor(46, 47, 48))
+        darkPalette.setColor(QPalette.ToolTipBase, base)
+        darkPalette.setColor(QPalette.ToolTipText, text)
+        darkPalette.setColor(QPalette.Text, text)
+        darkPalette.setColor(QPalette.Disabled, QPalette.Text, disabledText)
+        darkPalette.setColor(QPalette.Button, button)
+        darkPalette.setColor(QPalette.ButtonText, text)
+        darkPalette.setColor(QPalette.Disabled, QPalette.ButtonText, disabledText)
+
+        darkPalette.setColor(QPalette.Mid, button.lighter(120))
+        darkPalette.setColor(QPalette.Highlight, QColor(42, 130, 218))
+        darkPalette.setColor(QPalette.Disabled, QPalette.Highlight, QColor(80, 80, 80))
+        darkPalette.setColor(QPalette.HighlightedText, Qt.white)
+        darkPalette.setColor(QPalette.Disabled, QPalette.HighlightedText, QColor(127, 127, 127))
+        darkPalette.setColor(QPalette.Shadow, Qt.black)
+
+        self.darkPalette = darkPalette
+        self.defaultPalette = QGuiApplication.instance().palette()
+        self.togglePalette()
+
+    @Slot()
+    def togglePalette(self):
+        app = QGuiApplication.instance()
+        if app.palette() == self.darkPalette:
+            app.setPalette(self.defaultPalette)
+        else:
+            app.setPalette(self.darkPalette)
+        if self.qmlEngine.rootObjects():
+            self.qmlEngine.reload()
+
+
 if __name__ == "__main__":
     app = QGuiApplication([sys.argv[0], '-style', 'fusion'] + sys.argv[1:])  # force Fusion style as default
     app.setAttribute(Qt.AA_EnableHighDpiScaling)
-    qmlDir = os.path.join(os.path.dirname(__file__), "qml")
+
+    pwd = os.path.dirname(__file__)
+    qmlDir = os.path.join(pwd, "qml")
     url = os.path.join(qmlDir, "main.qml")
     engine = QmlInstantEngine()
     engine.addFilesFromDirectory(qmlDir)
@@ -22,10 +72,13 @@ if __name__ == "__main__":
 
     r = Reconstruction(parent=app)
     engine.rootContext().setContextProperty("_reconstruction", r)
+    pm = PaletteManager(engine, parent=app)
+    engine.rootContext().setContextProperty("_PaletteManager", pm)
 
     # Request any potential computation to stop on exit
     app.aboutToQuit.connect(r.stopExecution)
 
     engine.load(os.path.normpath(url))
+
     app.exec_()
 

meshroom/ui/qml/main.qml

@@ -166,6 +166,10 @@ ApplicationWindow {
         onTriggered: _reconstruction.undoStack.redo()
     }
 
+    Action {
+        shortcut: "Ctrl+Shift+P"
+        onTriggered: _PaletteManager.togglePalette()
+    }
     header: MenuBar {
         Menu {
             title: "File"

meshroom/ui/utils.py

@@ -175,8 +175,11 @@ class QmlInstantEngine(QQmlApplicationEngine):
             time.sleep(0.1)
             cptTry += 1
 
-        print("Reloading ", self._sourceFile)
-        self.load(self._sourceFile)
+        self.reload()
 
         # Finally, read the modified file to the watch system
         self.addFile(filepath)
+
+    def reload(self):
+        print("Reloading ", self._sourceFile)
+        self.load(self._sourceFile)