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//! Tools for computing screen locations from locations within a View and
//! vice-versa.
use crate::ViewId;
use floem_winit::window::{Window, WindowId};
use peniko::kurbo::{Point, Rect, Size};
use crate::window_tracking::{
monitor_bounds_for_monitor, rect_from_physical_bounds_for_window, with_window_id_and_window,
};
/// Create a ScreenLayout for a view. This can fail if the view or an
/// ancestor of it has no parent and is not realized on-screen, or if the
/// platform does not support reading window inner or outer bounds. ScreenLayout
/// is useful when needing to convert locations within a view into absolute
/// positions on-screen, such as for creating a window at position relative
/// to that view.
pub fn try_create_screen_layout(view: &ViewId) -> Option<ScreenLayout> {
with_window_id_and_window(view, |window_id, window| {
window
.current_monitor()
.map(|monitor| {
window
.inner_position()
.map(|inner_position| {
window
.outer_position()
.map(|outer_position| {
let monitor_bounds = monitor_bounds_for_monitor(window, &monitor);
let inner_size = window.inner_size();
let outer_size = window.outer_size();
let window_bounds = rect_from_physical_bounds_for_window(
window,
outer_position,
outer_size,
);
let window_content_bounds = rect_from_physical_bounds_for_window(
window,
inner_position,
inner_size,
);
let view_origin_in_window = find_window_origin(view);
let monitor_scale = window.scale_factor();
ScreenLayout {
monitor_scale,
monitor_bounds,
window_content_bounds,
window_bounds,
view_origin_in_window: Some(view_origin_in_window),
window_id: *window_id,
}
})
.ok()
})
.ok()
})
.unwrap_or(None)
.unwrap_or(None)
})
.unwrap_or(None)
}
pub fn screen_layout_for_window(window_id: WindowId, window: &Window) -> Option<ScreenLayout> {
window
.current_monitor()
.map(|monitor| {
window
.inner_position()
.map(|inner_position| {
window
.outer_position()
.map(|outer_position| {
let monitor_bounds = monitor_bounds_for_monitor(window, &monitor);
let inner_size = window.inner_size();
let outer_size = window.outer_size();
let window_bounds = rect_from_physical_bounds_for_window(
window,
outer_position,
outer_size,
);
let window_content_bounds = rect_from_physical_bounds_for_window(
window,
inner_position,
inner_size,
);
let view_origin_in_window = None;
let monitor_scale = window.scale_factor();
ScreenLayout {
monitor_scale,
monitor_bounds,
window_content_bounds,
window_bounds,
view_origin_in_window,
window_id,
}
})
.ok()
})
.ok()
})
.unwrap_or(None)
.unwrap_or(None)
}
/// A ScreenLayout is a snapshot of the layout of a view within a window
///
/// Relates a realized `View` to the bounds of the window that contains it,
/// and the window to the bounds of the monitor that contains it. All fields
/// are in logical coordinates (if the OS scales physical coordinates for high
/// DPI displays, the scaling is already applied).
///
/// Instances are a snapshot in time of the location of the view and window
/// at the time of creation, and are not updated if view or window or monitor
/// in use is.
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct ScreenLayout {
/// The window id
pub window_id: WindowId,
/// The scaling of the monitor, if any
pub monitor_scale: f64,
/// The logical bounds of the monitor
pub monitor_bounds: Rect,
/// The bounds of the view content within the monitor's bounds
pub window_content_bounds: Rect,
/// The bounds of the window within the monitor's bounds
pub window_bounds: Rect,
/// The origin of the view within the window, if this ScreenLayout was
/// created from a `View` rather than a `WindowId` - needed for computing
/// relative offsets from, e.g., the location of a mouse click within
/// a `View`.
pub view_origin_in_window: Option<Point>,
}
impl ScreenLayout {
/// Unscales this Screen to physical device coordinates, less any DPI
/// scaling done by hardware.
pub fn to_physical_scale(&self) -> Self {
// The bounds we have are pre-scaled by 1.0/window.scale(), so
// inverting them is multiplication, not division.
Self {
monitor_scale: 1.0,
monitor_bounds: scale_rect(self.monitor_scale, self.monitor_bounds),
window_bounds: scale_rect(self.monitor_scale, self.window_bounds),
window_content_bounds: scale_rect(self.monitor_scale, self.window_content_bounds),
view_origin_in_window: self
.view_origin_in_window
.map(|origin| scale_point(self.monitor_scale, origin)),
window_id: self.window_id,
}
}
/// Get the insets required to transform the outer rectangle into
/// the inner one in the form `(left, top, right, bottom)`
pub fn window_frame_insets(&self) -> (f64, f64, f64, f64) {
// Kurbo contains an Insets type obtainable from
// self.window_bounds - self.window_content_bounds
// but uses a definition of "insets" that is has nothing
// to do with what any UI toolkit has ever meant by the word.
(
self.window_content_bounds.x0 - self.window_bounds.x0,
self.window_content_bounds.y0 - self.window_bounds.y0,
self.window_bounds.x1 - self.window_content_bounds.x1,
self.window_bounds.y1 - self.window_content_bounds.y1,
)
}
/// If true, this instance has scaling applied.
pub fn is_scaled(&self) -> bool {
self.monitor_scale != 0_f64
}
/// Convert a screen position to a position within the view that created
/// this one.
pub fn view_location_from_screen(&self, screen_point: Point) -> Point {
let mut result = screen_point;
if let Some(origin) = self.view_origin_in_window {
result.x -= origin.x + self.window_content_bounds.x0;
result.y -= origin.y + self.window_content_bounds.y0;
}
result
}
/// Determine if this `ScreenBounds` has a different bounding rectangle for
/// the content and frame bounds. Some X11 window managers (Openbox, for one)
/// appear to support getting frame position separately from content position,
/// but in fact report the same bounds for both.
pub fn contains_frame_decoration_insets(&self) -> bool {
self.window_content_bounds != self.window_bounds
}
/// Compute a position, in screen coordinates, relative to the view this layout
/// was created from. If a target size is passed, the implementation will attempt
/// to adjust the resulting point so that a rectangle of the required size fits
/// entirely on-screen.
pub fn screen_location_from_view(
&self,
relative_position: Option<Point>,
target_size: Option<Size>,
) -> Point {
let mut result = Point::new(self.window_content_bounds.x0, self.window_content_bounds.y0);
if let Some(offset) = relative_position {
result.x += offset.x;
result.y += offset.y;
}
if let Some(origin) = self.view_origin_in_window {
result.x += origin.x;
result.y += origin.y;
}
// If we have a size, adjust the resulting point to ensure the resulting
// bounds will fit on screen (if it is possible)
if let Some(size) = target_size {
let mut target_bounds = Rect::new(
result.x,
result.y,
result.x + size.width,
result.y + size.height,
);
if target_bounds.x1 > self.monitor_bounds.x1 {
let offset = target_bounds.x1 - self.monitor_bounds.x1;
target_bounds.x0 -= offset;
target_bounds.x1 -= offset;
}
if target_bounds.y1 > self.monitor_bounds.y1 {
let offset = target_bounds.y1 - self.monitor_bounds.y1;
target_bounds.y0 -= offset;
target_bounds.y1 -= offset;
}
if target_bounds.x0 < self.monitor_bounds.x0 {
let offset = self.monitor_bounds.x0 - target_bounds.x0;
target_bounds.x0 += offset;
target_bounds.x1 += offset;
}
if target_bounds.y0 < self.monitor_bounds.y0 {
let offset = self.monitor_bounds.y0 - target_bounds.y0;
target_bounds.y0 += offset;
target_bounds.y1 += offset
}
result.x = target_bounds.x0;
result.y = target_bounds.y0;
}
result
}
}
fn find_window_origin(view: &ViewId) -> Point {
let mut pt = Point::ZERO;
recursively_find_window_origin(*view, &mut pt);
pt
}
fn recursively_find_window_origin(view: ViewId, point: &mut Point) {
if let Some(layout) = view.get_layout() {
point.x += layout.location.x as f64;
point.y += layout.location.y as f64;
if let Some(parent) = view.parent() {
recursively_find_window_origin(parent, point);
}
}
}
fn scale_point(by: f64, mut pt: Point) -> Point {
pt.x *= by;
pt.y *= by;
pt
}
fn scale_rect(by: f64, mut bds: Rect) -> Rect {
bds.x0 *= by;
bds.y0 *= by;
bds.x1 *= by;
bds.y1 *= by;
bds
}