Struct WidgetBase 

pub struct WidgetBase {
    pub margin: Insets,
    pub h_anchor: HAnchor,
    pub v_anchor: VAnchor,
    pub min_size: Size,
    pub max_size: Size,
    pub enforce_integer_bounds: bool,
    pub tooltip: Option<String>,
    pub default_action: bool,
    pub cancel_action: bool,
}

Stores the five universal layout properties that every widget carries.

Embed in every concrete widget and delegate the five Widget layout-property getters to the corresponding fields. The builder methods return Self so they can be chained on the concrete type.

pub struct MyWidget {
    bounds:   Rect,
    children: Vec<Box<dyn Widget>>,
    base:     WidgetBase,
    // ...widget-specific fields...
}

impl Widget for MyWidget {
    fn margin(&self)   -> Insets  { self.base.margin }
    fn h_anchor(&self) -> HAnchor { self.base.h_anchor }
    fn v_anchor(&self) -> VAnchor { self.base.v_anchor }
    fn min_size(&self) -> Size    { self.base.min_size }
    fn max_size(&self) -> Size    { self.base.max_size }
    // ...
}

impl MyWidget {
    pub fn with_margin(mut self, m: Insets)    -> Self { self.base.margin   = m; self }
    pub fn with_h_anchor(mut self, h: HAnchor) -> Self { self.base.h_anchor = h; self }
    pub fn with_v_anchor(mut self, v: VAnchor) -> Self { self.base.v_anchor = v; self }
    pub fn with_min_size(mut self, s: Size)    -> Self { self.base.min_size = s; self }
    pub fn with_max_size(mut self, s: Size)    -> Self { self.base.max_size = s; self }
}

Fields

margin: Insets

Space outside this widget’s bounds (read by the parent during layout).

h_anchor: HAnchor

Horizontal anchor — how this widget positions/sizes itself horizontally.

v_anchor: VAnchor

Vertical anchor — how this widget positions/sizes itself vertically.

min_size: Size

Minimum size constraint (logical units). The parent will never assign a slot smaller than this in either axis.

max_size: Size

Maximum size constraint (logical units). The parent will never assign a slot larger than this in either axis.

enforce_integer_bounds: bool

Per-widget override of the global pixel-alignment policy. When true (the common default) paint_subtree rounds the child translation to the physical pixel grid before painting, so crisp text and strokes land on whole pixels regardless of fractional Label heights (font_size × 1.5) accumulating through a flex stack. Disable for widgets that deliberately want sub-pixel positioning (smooth-scrolling markers, zoomed canvases).

Mirrors MatterCAD’s GuiWidget.EnforceIntegerBounds. Captured from [pixel_bounds::default_enforce_integer_bounds] at construction; later global changes do NOT retroactively alter existing widgets.

tooltip: Option<String>

Optional hover-help text. When Some, the central tooltip controller (see crate::widgets::tooltip) shows this string after the initial hover delay whenever this widget is the deepest hovered tipped widget — no wrapper needed. This is the universal storage behind Widget::with_tooltip / Widget::tooltip_text: any widget that embeds a WidgetBase opts in for free.

A String here is why WidgetBase is Clone but not Copy.

default_action: bool

Marks this widget as its scope’s keyboard default action — the control Return / Enter activates when the key reaches the scope unconsumed (focus is not on a text input, which consumes Enter itself). SwiftUI .keyboardShortcut(.defaultAction) / AppKit’s default button.

ModalSheet searches its content for the first visible widget with this flag when Enter bubbles to it and activates it by dispatching that Enter (a Button fires its click); the App does the same for the whole tree when no modal is showing, so only the topmost scope’s default fires. Set via Button::with_default_action; any widget embedding a WidgetBase can opt in the same way.

cancel_action: bool

Escape counterpart of default_action — SwiftUI .keyboardShortcut(.cancelAction). A ModalSheet whose content holds a cancel-action widget activates it on Escape instead of closing itself, so the Cancel handler owns dismissal. Set via Button::with_cancel_action.

Implementations

impl WidgetBase

pub fn new() -> Self

Construct a WidgetBase with all defaults: zero margin, FIT anchors, ZERO min size, Size::MAX max size. enforce_integer_bounds captures the current process-wide default.

pub fn with_margin(self, m: Insets) -> Self

pub fn with_h_anchor(self, h: HAnchor) -> Self

pub fn with_v_anchor(self, v: VAnchor) -> Self

pub fn with_min_size(self, s: Size) -> Self

pub fn with_max_size(self, s: Size) -> Self

pub fn with_tooltip(self, text: impl Into<String>) -> Self

Attach hover-help text read by the central tooltip controller.

pub fn clamp_size(&self, proposed: Size) -> Size

Clamp proposed to [min_size, max_size].

pub fn scaled_margin(&self) -> Insets

Return margin in logical units.

Previously multiplied by device_scale when margin handling was spread across widgets. DPI scaling is now applied once at the App boundary via a paint- ctx transform, so widgets work in logical units end-to-end and this helper is a simple passthrough kept for call-site readability.

Trait Implementations

impl Clone for WidgetBase

fn clone(&self) -> WidgetBase

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WidgetBase

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for WidgetBase

fn default() -> Self

Returns the “default value” for a type.

impl FromReflect for WidgetBase

fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self>

Constructs a concrete instance of Self from a reflected value.

fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails.

impl GetTypeRegistration for WidgetBase

fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.

fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type.

impl PartialReflect for WidgetBase

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value.

fn try_apply(&mut self, value: &dyn PartialReflect) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

fn reflect_owned(self: Box<Self>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

fn try_into_reflect( self: Box<Self>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

fn try_as_reflect(&self) -> Option<&dyn Reflect>

Attempts to cast this type to a fully-reflected value.

fn try_as_reflect_mut(&mut self) -> Option<&mut dyn Reflect>

Attempts to cast this type to a mutable, fully-reflected value.

fn into_partial_reflect(self: Box<Self>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

fn as_partial_reflect(&self) -> &dyn PartialReflect

Casts this type to a reflected value.

fn as_partial_reflect_mut(&mut self) -> &mut dyn PartialReflect

Casts this type to a mutable, reflected value.

fn reflect_partial_eq(&self, value: &dyn PartialReflect) -> Option<bool>

Returns a “partial equality” comparison result.

fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>

Attempts to clone Self using reflection.

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

fn to_dynamic(&self) -> Box<dyn PartialReflect>

Converts this reflected value into its dynamic representation based on its kind.

fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>

where T: 'static, Self: Sized + TypePath,

For a type implementing PartialReflect, combines reflect_clone and take in a useful fashion, automatically constructing an appropriate ReflectCloneError if the downcast fails.

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value.

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl Reflect for WidgetBase

fn into_any(self: Box<Self>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &dyn Any

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut dyn Any

Returns the value as a &mut dyn Any.

fn into_reflect(self: Box<Self>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.

fn as_reflect(&self) -> &dyn Reflect

Casts this type to a fully-reflected value.

fn as_reflect_mut(&mut self) -> &mut dyn Reflect

Casts this type to a mutable, fully-reflected value.

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value.

impl Struct for WidgetBase

fn field(&self, name: &str) -> Option<&dyn PartialReflect>

Returns a reference to the value of the field named name as a &dyn PartialReflect.

fn field_mut(&mut self, name: &str) -> Option<&mut dyn PartialReflect>

Returns a mutable reference to the value of the field named name as a &mut dyn PartialReflect.

fn field_at(&self, index: usize) -> Option<&dyn PartialReflect>

Returns a reference to the value of the field with index index as a &dyn PartialReflect.

fn field_at_mut(&mut self, index: usize) -> Option<&mut dyn PartialReflect>

Returns a mutable reference to the value of the field with index index as a &mut dyn PartialReflect.

fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.

fn field_len(&self) -> usize

Returns the number of fields in the struct.

fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.

fn to_dynamic_struct(&self) -> DynamicStruct

Creates a new DynamicStruct from this struct.

fn get_represented_struct_info(&self) -> Option<&'static StructInfo>

Will return None if TypeInfo is not available.

impl TypePath for WidgetBase

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type.

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type.

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous.

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous.

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous.

impl Typed for WidgetBase

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.