snippets/qt_screen_info.py

@@ -1,30 +1,22 @@
 """
-DPI and info helper script for display metrics.
+Resource list for mucking with DPIs on multiple screens:
+
+- https://stackoverflow.com/questions/42141354/convert-pixel-size-to-point-size-for-fonts-on-multiple-platforms
+- https://stackoverflow.com/questions/25761556/qt5-font-rendering-different-on-various-platforms/25929628#25929628
+- https://doc.qt.io/qt-5/highdpi.html
+- https://stackoverflow.com/questions/20464814/changing-dpi-scaling-size-of-display-make-qt-applications-font-size-get-rendere
+- https://stackoverflow.com/a/20465247
+- https://doc.qt.io/archives/qt-4.8/qfontmetrics.html#width
+- https://forum.qt.io/topic/54136/how-do-i-get-the-qscreen-my-widget-is-on-qapplication-desktop-screen-returns-a-qwidget-and-qobject_cast-qscreen-returns-null/3
+- https://forum.qt.io/topic/43625/point-sizes-are-they-reliable/4
+- https://stackoverflow.com/questions/16561879/what-is-the-difference-between-logicaldpix-and-physicaldpix-in-qt
+- https://doc.qt.io/qt-5/qguiapplication.html#screenAt
+
 """
 
-# Resource list for mucking with DPIs on multiple screens:
-# https://stackoverflow.com/questions/42141354/convert-pixel-size-to-point-size-for-fonts-on-multiple-platforms
-# https://stackoverflow.com/questions/25761556/qt5-font-rendering-different-on-various-platforms/25929628#25929628
-# https://doc.qt.io/qt-5/highdpi.html
-# https://stackoverflow.com/questions/20464814/changing-dpi-scaling-size-of-display-make-qt-applications-font-size-get-rendere
-# https://stackoverflow.com/a/20465247
-# https://doc.qt.io/archives/qt-4.8/qfontmetrics.html#width
-# https://forum.qt.io/topic/54136/how-do-i-get-the-qscreen-my-widget-is-on-qapplication-desktop-screen-returns-a-qwidget-and-qobject_cast-qscreen-returns-null/3
-# https://forum.qt.io/topic/43625/point-sizes-are-they-reliable/4
-# https://stackoverflow.com/questions/16561879/what-is-the-difference-between-logicaldpix-and-physicaldpix-in-qt
-# https://doc.qt.io/qt-5/qguiapplication.html#screenAt
-
-from pyqtgraph import (
-    QtGui,
-)
+from pyqtgraph import QtGui
 from PyQt5.QtCore import (
-    Qt,
-    QCoreApplication,
-)
-from PyQt5.QtWidgets import (
-    QWidget,
-    QMainWindow,
-    QApplication,
+     Qt, QCoreApplication
 )
 
 # Proper high DPI scaling is available in Qt >= 5.6.0. This attibute
@@ -36,48 +28,55 @@ if hasattr(Qt, 'AA_UseHighDpiPixmaps'):
     QCoreApplication.setAttribute(Qt.AA_UseHighDpiPixmaps, True)
 
 
-app = QApplication([])
-window = QMainWindow()
-main_widget = QWidget()
+app = QtGui.QApplication([])
+window = QtGui.QMainWindow()
+main_widget = QtGui.QWidget()
 window.setCentralWidget(main_widget)
 window.show()
 
-# TODO: move widget through multiple displays and auto-detect the pixel
-# ratio? (probably is gonna require calls to i3ipc on linux)..
 pxr = main_widget.devicePixelRatioF()
 
-# TODO: how to detect list of displays from API?
+# screen_num = app.desktop().screenNumber()
 # screen = app.screens()[screen_num]
 
-
-def ppscreeninfo(screen: QtGui.QScreen) -> None:
-    # screen_num = app.desktop().screenNumber()
-    name = screen.name()
-    size = screen.size()
-    geo = screen.availableGeometry()
-    phydpi = screen.physicalDotsPerInch()
-    logdpi = screen.logicalDotsPerInch()
-    rr = screen.refreshRate()
-
-    print(
-        # f'screen number: {screen_num}\n',
-        f'screen: {name}\n'
-        f'  size: {size}\n'
-        f'  geometry: {geo}\n'
-        f'  logical dpi: {logdpi}\n'
-        f'  devicePixelRationF(): {pxr}\n'
-        f'  physical dpi: {phydpi}\n'
-        f'  refresh rate: {rr}\n'
-    )
-
-    print('-'*50 + '\n')
-
-
 screen = app.screenAt(main_widget.geometry().center())
-ppscreeninfo(screen)
+
+name = screen.name()
+size = screen.size()
+geo = screen.availableGeometry()
+phydpi = screen.physicalDotsPerInch()
+logdpi = screen.logicalDotsPerInch()
+
+print(
+    # f'screen number: {screen_num}\n',
+    f'screen name: {name}\n'
+    f'screen size: {size}\n'
+    f'screen geometry: {geo}\n\n'
+    f'devicePixelRationF(): {pxr}\n'
+    f'physical dpi: {phydpi}\n'
+    f'logical dpi: {logdpi}\n'
+)
+
+print('-'*50)
 
 screen = app.primaryScreen()
-ppscreeninfo(screen)
+
+name = screen.name()
+size = screen.size()
+geo = screen.availableGeometry()
+phydpi = screen.physicalDotsPerInch()
+logdpi = screen.logicalDotsPerInch()
+
+print(
+    # f'screen number: {screen_num}\n',
+    f'screen name: {name}\n'
+    f'screen size: {size}\n'
+    f'screen geometry: {geo}\n\n'
+    f'devicePixelRationF(): {pxr}\n'
+    f'physical dpi: {phydpi}\n'
+    f'logical dpi: {logdpi}\n'
+)
+
 
 # app-wide font
 font = QtGui.QFont("Hack")