Improved DPI Scaling on Windows and Fixed related Bugs

changes/2155.bugfix.rst

@@ -0,0 +1 @@
+DPI scaling on Windows is now improved and related bugs are fixed.

core/src/toga/types.py

@@ -29,7 +29,7 @@ def __str__(self) -> str:
 
 
 class Position(NamedTuple):
-    """A 2D window position."""
+    """A 2D position."""
 
     #: X coordinate, in CSS pixels.
     x: int
@@ -46,15 +46,21 @@ def __add__(self, other):
     def __sub__(self, other):
         return Position(self.x - other.x, self.y - other.y)
 
+    def __mul__(self, other):
+        return Position(self.x * other, self.y * other)
+
 
 class Size(NamedTuple):
-    """A 2D window size."""
+    """A 2D size."""
 
-    #: Width
+    #: Width, in CSS pixels.
     width: int
 
-    #: Height
+    #: Height, in CSS pixels.
     height: int
 
     def __str__(self) -> str:
         return f"({self.width} x {self.height})"
+
+    def __mul__(self, other):
+        return Size(self.width * other, self.height * other)

core/tests/test_types.py

@@ -7,7 +7,12 @@ def test_position_properties():
     assert p.x == 1
     assert p.y == 2
     assert str(p) == "(1, 2)"
-    p == (1, 2)  # Tuple equivalence for backwards-compatibility
+
+    assert p == Position(1, 2)
+    assert p != Position(1, 3)
+
+    assert p == (1, 2)  # Tuple equivalence for backwards-compatibility
+    assert p != (1, 3)
 
 
 def test_add_positions():
@@ -20,10 +25,26 @@ def test_sub_positions():
     assert Position(1, 2) - Position(3, 4) == Position(-2, -2)
 
 
+def test_mul_position():
+    """Multiplying a Position multiplies its X and Y values"""
+    assert Position(1, 2) * 2 == Position(2, 4)
+    assert Position(1, 2) * 0.5 == Position(0.5, 1)
+    assert Position(1, 2) * 0 == Position(0, 0)
+    assert Position(1, 2) * -1 == Position(-1, -2)
+
+
 def test_size_properties():
     """A Size NamedTuple has a width and height."""
     s = Size(1, 2)
     assert s.width == 1
     assert s.height == 2
     assert str(s) == "(1 x 2)"
     s == (1, 2)  # Tuple equivalence for backwards-compatibility
+
+
+def test_mul_size():
+    """Multiplying a Size multiplies its width and height values"""
+    assert Size(1, 2) * 2 == Size(2, 4)
+    assert Size(1, 2) * 0.5 == Size(0.5, 1)
+    assert Size(1, 2) * 0 == Size(0, 0)
+    assert Size(1, 2) * -1 == Size(-1, -2)

examples/command/command/app.py

@@ -98,10 +98,9 @@ def startup(self):
         cmd5 = toga.Command(
             self.action5,
             text="TB Action 5",
-            tooltip="Perform toolbar action 5",
             order=2,
             group=sub_menu,
-        )  # there is deliberately no icon to show that a toolbar action also works with text
+        )  # there is deliberately no icon or tooltip
         cmd6 = toga.Command(
             self.action6,
             text="Action 6",

examples/window/window/app.py

@@ -3,32 +3,79 @@
 from functools import partial
 
 import toga
-from toga.constants import COLUMN, RIGHT
+from toga.constants import COLUMN, RIGHT, ROW
 from toga.style import Pack
 
 
 class WindowDemoApp(toga.App):
     # Button callback functions
     def do_origin(self, widget, **kwargs):
         self.main_window.position = (0, 0)
+        self.do_report()
+
+    def do_up(self, widget, **kwargs):
+        self.main_window.position = (
+            self.main_window.position.x,
+            self.main_window.position.y - 200,
+        )
+        self.do_report()
+
+    def do_down(self, widget, **kwargs):
+        self.main_window.position = (
+            self.main_window.position.x,
+            self.main_window.position.y + 200,
+        )
+        self.do_report()
 
     def do_left(self, widget, **kwargs):
-        self.main_window.position = (-1000, 500)
+        self.main_window.position = (
+            self.main_window.position.x - 200,
+            self.main_window.position.y,
+        )
+        self.do_report()
 
     def do_right(self, widget, **kwargs):
-        self.main_window.position = (2000, 500)
+        self.main_window.position = (
+            self.main_window.position.x + 200,
+            self.main_window.position.y,
+        )
+        self.do_report()
 
-    def do_left_current_screen(self, widget, **kwargs):
-        self.main_window.screen_position = (0, 100)
+    def do_screen_top(self, widget, **kwargs):
+        self.main_window.screen_position = (
+            self.main_window.screen_position.x,
+            0,
+        )
+        self.do_report()
+
+    def do_screen_bottom(self, widget, **kwargs):
+        self.main_window.screen_position = (
+            self.main_window.screen_position.x,
+            self.main_window.screen.size.height - self.main_window.size.height,
+        )
+        self.do_report()
 
-    def do_right_current_screen(self, widget, **kwargs):
-        self.main_window.screen_position = (1080, 100)
+    def do_screen_left(self, widget, **kwargs):
+        self.main_window.screen_position = (
+            0,
+            self.main_window.screen_position.y,
+        )
+        self.do_report()
+
+    def do_screen_right(self, widget, **kwargs):
+        self.main_window.screen_position = (
+            self.main_window.screen.size.width - self.main_window.size.width,
+            self.main_window.screen_position.y,
+        )
+        self.do_report()
 
     def do_small(self, widget, **kwargs):
         self.main_window.size = (400, 300)
+        self.do_report()
 
     def do_large(self, widget, **kwargs):
         self.main_window.size = (1500, 1000)
+        self.do_report()
 
     def do_app_full_screen(self, widget, **kwargs):
         if self.is_full_screen:
@@ -85,6 +132,7 @@ def do_new_windows(self, widget, **kwargs):
 
     def do_screen_change(self, screen, widget, **kwargs):
         self.current_window.screen = screen
+        self.do_report()
 
     async def do_save_screenshot(self, screen, window, **kwargs):
         screenshot = screen.as_image()
@@ -112,11 +160,14 @@ async def do_hide_cursor(self, widget, **kwargs):
         self.show_cursor()
         self.label.text = "Cursor should be back!"
 
-    def do_report(self, widget, **kwargs):
+    def do_report(self, *args, **kwargs):
+        window = self.main_window
+        screen = window.screen
         self.label.text = (
-            f"Window {self.main_window.title!r} "
-            f"has size {self.main_window.size!r} "
-            f"at {self.main_window.position!r}"
+            f"Window: size={tuple(window.size)}, position={tuple(window.position)}, "
+            f"screen_position={tuple(window.screen_position)}\n"
+            f"Screen: name={screen.name!r}, size={tuple(screen.size)}, "
+            f"origin={tuple(screen.origin)}"
         )
 
     def do_next_content(self, widget):
@@ -166,21 +217,30 @@ def startup(self):
 
         # Buttons
         btn_style = Pack(flex=1, padding=5)
-        btn_do_origin = toga.Button(
-            "Go to origin", on_press=self.do_origin, style=btn_style
-        )
-        btn_do_left = toga.Button("Go left", on_press=self.do_left, style=btn_style)
-        btn_do_right = toga.Button("Go right", on_press=self.do_right, style=btn_style)
-        btn_do_left_current_screen = toga.Button(
-            "Go left on current screen",
-            on_press=self.do_left_current_screen,
-            style=btn_style,
+
+        row_move = toga.Box(
+            style=Pack(direction=ROW),
+            children=[
+                toga.Label("Move: "),
+                toga.Button("Origin", on_press=self.do_origin, style=btn_style),
+                toga.Button("Up", on_press=self.do_up, style=btn_style),
+                toga.Button("Down", on_press=self.do_down, style=btn_style),
+                toga.Button("Left", on_press=self.do_left, style=btn_style),
+                toga.Button("Right", on_press=self.do_right, style=btn_style),
+            ],
         )
-        btn_do_right_current_screen = toga.Button(
-            "Go right on current screen",
-            on_press=self.do_right_current_screen,
-            style=btn_style,
+
+        row_screen_edge = toga.Box(
+            style=Pack(direction=ROW),
+            children=[
+                toga.Label("Screen edge: "),
+                toga.Button("Top", on_press=self.do_screen_top, style=btn_style),
+                toga.Button("Bottom", on_press=self.do_screen_bottom, style=btn_style),
+                toga.Button("Left", on_press=self.do_screen_left, style=btn_style),
+                toga.Button("Right", on_press=self.do_screen_right, style=btn_style),
+            ],
         )
+
         btn_do_small = toga.Button(
             "Become small", on_press=self.do_small, style=btn_style
         )
@@ -256,11 +316,9 @@ def startup(self):
         self.inner_box = toga.Box(
             children=[
                 self.label,
-                btn_do_origin,
-                btn_do_left,
-                btn_do_right,
-                btn_do_left_current_screen,
-                btn_do_right_current_screen,
+                row_move,
+                row_screen_edge,
+                btn_do_report,
                 btn_do_small,
                 btn_do_large,
                 btn_do_app_full_screen,
@@ -269,7 +327,6 @@ def startup(self):
                 btn_do_new_windows,
                 btn_do_current_window_cycling,
                 btn_do_hide_cursor,
-                btn_do_report,
                 btn_change_content,
                 btn_hide,
                 btn_beep,