Window

Controls the app window.

Limitation:

This control is for Desktop platforms (macOS, Windows, Linux) only.

Inherits: BaseControl

Properties

• alignment - Defines the alignment of the app window.
• always_on_bottom - Whether the app window should always be displayed below other windows.
• always_on_top - Whether the app window should always be displayed on top of other windows/apps.
• aspect_ratio - Defines the aspect ratio of the app window.
• badge_label - Sets a badge label on the app window.
• bgcolor - Sets background color of an application window.
• brightness - The brightness of a app window.
• focused - Whether the app window should be focused.
• frameless - Whether the app window should be frameless.
• full_screen - Whether to switch the app's window to fullscreen mode.
• height - Defines the height of the app window.
• icon - The icon of the app window.
• ignore_mouse_events - Whether the app window should ignore mouse events, passing them to the window below it.
• left - Defines the horizontal position of the app window - a distance in virtual pixels from the left edge of the screen.
• max_height - Defines the maximum height of the app window.
• max_width - Defines the maximum width of the app window.
• maximizable - Whether to hide/disable app window's "Maximize" button.
• maximized - Whether the app window is maximized.
• min_height - Defines the minimum height of the app window.
• min_width - Defines the minimum width of the app window.
• minimizable - Whether the app window can be minimized through the window's "Minimize" button.
• minimized - Whether the app window is minimized.
• movable - Whether the app window can be moved.
• opacity - Defines the opacity of the app window.
• prevent_close - Set to True to intercept the native close signal.
• progress_bar - The value from 0.0 to 1.0 to display a progress bar on Task Bar or Dock.
• resizable - Whether the app window can be resized.
• shadow - Whether to display a shadow around the app window.
• skip_task_bar - Whether the app window should be hidden from the Task Bar (on Windows) or Dock (on macOS).
• title_bar_buttons_hidden - Whether to hide the app window's title bar buttons.
• title_bar_hidden - Whether to hide the app window's title bar.
• top - Defines the vertical position of a native OS window - a distance in virtual pixels from the top edge of the screen.
• visible - Whether to make the app window visible.
• width - Defines the width of the app window.

Events

• on_event - Called when app window changes its state.

Methods

• center - Centers the app window.
• close - Requests graceful closing of the app window.
• destroy - Destroys the app window.
• start_dragging - Starts dragging the app window.
• start_resizing - Starts resizing the app window.
• to_front - Brings the app window to the front.
• wait_until_ready_to_show - Waits until the app window is ready to show.

Properties

buildalignmentclass-attributeinstance-attribute

alignment: Optional[Alignment] = None

Defines the alignment of the app window.

buildalways_on_bottomclass-attributeinstance-attribute

always_on_bottom: bool = False

Whether the app window should always be displayed below other windows.

Limitation:

Has effect on Linux and Windows only.

buildalways_on_topclass-attributeinstance-attribute

always_on_top: bool = False

Whether the app window should always be displayed on top of other windows/apps.

buildaspect_ratioclass-attributeinstance-attribute

aspect_ratio: Optional[Number] = None

Defines the aspect ratio of the app window.

buildbadge_labelclass-attributeinstance-attribute

badge_label: Optional[str] = None

Sets a badge label on the app window.

Limitation:

Has effect on macOS only.

buildbgcolorclass-attributeinstance-attribute

bgcolor: Optional[ColorValue] = None

Sets background color of an application window.

Tip

Can be used together with flet.Page.bgcolor to make a window transparent.

buildbrightnessclass-attributeinstance-attribute

brightness: Optional[Brightness] = None

The brightness of a app window.

buildfocusedclass-attributeinstance-attribute

focused: bool = True

Whether the app window should be focused.

Set to True to focus programmatically.

buildframelessclass-attributeinstance-attribute

frameless: bool = False

Whether the app window should be frameless.

buildfull_screenclass-attributeinstance-attribute

full_screen: bool = False

Whether to switch the app's window to fullscreen mode.

buildheightclass-attributeinstance-attribute

height: Optional[Number] = None

Defines the height of the app window.

buildiconclass-attributeinstance-attribute

icon: Optional[str] = None

The icon of the app window.

The file should have the .ico extension.

Limitation:

Has effect on Windows only.

buildignore_mouse_eventsclass-attributeinstance-attribute

ignore_mouse_events: bool = False

Whether the app window should ignore mouse events, passing them to the window below it. If this window has focus, it will still receive keyboard events.

buildleftclass-attributeinstance-attribute

left: Optional[Number] = None

Defines the horizontal position of the app window - a distance in virtual pixels from the left edge of the screen.

buildmax_heightclass-attributeinstance-attribute

max_height: Optional[Number] = None

Defines the maximum height of the app window.

buildmax_widthclass-attributeinstance-attribute

max_width: Optional[Number] = None

Defines the maximum width of the app window.

buildmaximizableclass-attributeinstance-attribute

maximizable: bool = True

Whether to hide/disable app window's "Maximize" button.

buildmaximizedclass-attributeinstance-attribute

maximized: bool = False

Whether the app window is maximized.

Set to True to maximize programmatically.

buildmin_heightclass-attributeinstance-attribute

min_height: Optional[Number] = None

Defines the minimum height of the app window.

buildmin_widthclass-attributeinstance-attribute

min_width: Optional[Number] = None

Defines the minimum width of the app window.

buildminimizableclass-attributeinstance-attribute

minimizable: bool = True

Whether the app window can be minimized through the window's "Minimize" button.

buildminimizedclass-attributeinstance-attribute

minimized: bool = False

Whether the app window is minimized.

Set to True to minimize programmatically.

buildmovableclass-attributeinstance-attribute

movable: bool = True

Whether the app window can be moved.

Limitation:

Has effect on macOS only.

buildopacityclass-attributeinstance-attribute

opacity: Number = 1.0

Defines the opacity of the app window.

Raises:

• ValueError - If it is not between 0.0 and 1.0 inclusive.

buildprevent_closeclass-attributeinstance-attribute

prevent_close: bool = False

Set to True to intercept the native close signal.

Could be used to implement app exit confirmation logic.

buildprogress_barclass-attributeinstance-attribute

progress_bar: Optional[Number] = None

The value from 0.0 to 1.0 to display a progress bar on Task Bar or Dock.

buildresizableclass-attributeinstance-attribute

resizable: bool = True

Whether the app window can be resized.

buildshadowclass-attributeinstance-attribute

shadow: bool = True

Whether to display a shadow around the app window.

buildskip_task_barclass-attributeinstance-attribute

skip_task_bar: bool = False

Whether the app window should be hidden from the Task Bar (on Windows) or Dock (on macOS).

buildtitle_bar_buttons_hiddenclass-attributeinstance-attribute

title_bar_buttons_hidden: bool = False

Whether to hide the app window's title bar buttons.

Limitation:

Has effect on macOS only.

buildtitle_bar_hiddenclass-attributeinstance-attribute

title_bar_hidden: bool = False

Whether to hide the app window's title bar.

buildtopclass-attributeinstance-attribute

top: Optional[Number] = None

Defines the vertical position of a native OS window - a distance in virtual pixels from the top edge of the screen.

buildvisibleclass-attributeinstance-attribute

visible: bool = True

Whether to make the app window visible.

Can be of use when the app starts as hidden.

buildwidthclass-attributeinstance-attribute

width: Optional[Number] = None

Defines the width of the app window.

Events

bolton_eventclass-attributeinstance-attribute

on_event: Optional[EventHandler[WindowEvent]] = None

Called when app window changes its state. For example, when the window is maximized or minimized.

Methods

deployed_codecenterasync

center()

Centers the app window.

deployed_codecloseasync

close()

Requests graceful closing of the app window.

This sends a native close request equivalent to pressing the window close button. If prevent_close is enabled, the close may be intercepted and reported via on_event with flet.WindowEventType.CLOSE.

deployed_codedestroyasync

destroy()

Destroys the app window.

deployed_codestart_draggingasync

start_dragging()

Starts dragging the app window.

deployed_codestart_resizingasync

start_resizing(edge: WindowResizeEdge)

Starts resizing the app window.

deployed_codeto_frontasync

to_front()

Brings the app window to the front.

deployed_codewait_until_ready_to_showasync

wait_until_ready_to_show()

Waits until the app window is ready to show.