Struct druid::widget::Viewport

pub struct Viewport {
    pub content_size: Size,
    pub rect: Rect,
}

Represents the size and position of a rectangular "viewport" into a larger area.

Fields

content_size: Size

The size of the area that we have a viewport into.

rect: Rect

The view rectangle.

Implementations

impl Viewport

pub fn clamp_view_origin(&self, origin: Point) -> Point

Tries to find a position for the view rectangle that is contained in the content rectangle.

If the supplied origin is good, returns it; if it isn't, we try to return the nearest origin that would make the view rectangle contained in the content rectangle. (This will fail if the content is smaller than the view, and we return 0.0 in each dimension where the content is smaller.)

pub fn pan_by(&mut self, delta: Vec2) -> bool

Changes the viewport offset by delta, while trying to keep the view rectangle inside the content rectangle.

Returns true if the offset actually changed. Even if delta is non-zero, the offset might not change. For example, if you try to move the viewport down but it is already at the bottom of the child widget, then the offset will not change and this function will return false.

pub fn pan_to(&mut self, origin: Point) -> bool

Sets the viewport origin to pos, while trying to keep the view rectangle inside the content rectangle.

Returns true if the position changed. Note that the valid values for the viewport origin are constrained by the size of the child, and so the origin might not get set to exactly pos.

pub fn pan_to_visible(&mut self, rect: Rect) -> bool

Pan the smallest distance that makes the target Rect visible.

If the target rect is larger than viewport size, we will prioritize the region of the target closest to its origin.

Trait Implementations

impl Clone for Viewport

pub fn clone(&self) -> Viewport

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for Viewport

impl Debug for Viewport

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

Formats the value using the given formatter.

impl Default for Viewport

pub fn default() -> Viewport

Returns the "default value" for a type.

impl PartialEq<Viewport> for Viewport

pub fn eq(&self, other: &Viewport) -> bool

This method tests for self and other values to be equal, and is used by ==.

pub fn ne(&self, other: &Viewport) -> bool

This method tests for !=.

impl StructuralPartialEq for Viewport