Struct HDWP

pub struct HDWP(/* private fields */);

Available on crate feature user only.

Handle to a deferred window position.

Implementations

impl HDWP

pub const unsafe fn from_ptr(p: *mut c_void) -> Self

Constructs a new handle object by wrapping a pointer.

This method can be used as an escape hatch to interoperate with other libraries.

Safety

Be sure the pointer has the correct type and isn’t owned by anyone else, otherwise you may cause memory access violations.

pub const unsafe fn raw_copy(&self) -> Self

Returns a raw copy of the underlying handle pointer.

Safety

As the name implies, raw_copy returns a raw copy of the handle, so closing one of the copies won’t close the others. This means a handle can be used after it has been closed, what can lead to errors and undefined behavior. Even worse: sometimes Windows reuses handle values, so you can call a method on a completely different handle type, what can be catastrophic.

However, in some cases the Windows API demands a copy of the handle – raw_copy is an escape hatch to fill this gap.

pub const unsafe fn as_mut(&mut self) -> &mut *mut c_void

Returns a mutable reference to the underlying raw pointer.

This method can be used as an escape hatch to interoperate with other libraries.

Safety

This method exposes the raw pointer used by raw Windows calls. It’s an opaque pointer to an internal Windows structure, and no dereferencings should be attempted.

pub const fn ptr(&self) -> *mut c_void

Returns the underlying raw pointer.

This method exposes the raw pointer used by raw Windows calls. It’s an opaque pointer to an internal Windows structure, and no dereferencings should be attempted.

This method can be used as an escape hatch to interoperate with other libraries.

impl HDWP

pub fn BeginDeferWindowPos( num_windows: u32, ) -> SysResult<EndDeferWindowPosGuard>

BeginDeferWindowPos function.

In the original C implementation, BeginDeferWindowPos returns a handle which must be passed to EndDeferWindowPos as a cleanup operation.

Here, the cleanup is performed automatically, because BeginDeferWindowPos returns an EndDeferWindowPosGuard, which automatically calls EndDeferWindowPos when the guard goes out of scope.

pub fn DeferWindowPos( &mut self, hwnd: &HWND, hwnd_insert_after: HwndPlace, top_left: POINT, sz: SIZE, flags: SWP, ) -> SysResult<()>

DeferWindowPos function.

Originally this method returns the handle to the reallocated memory object; here the original handle is automatically updated.

Trait Implementations

impl Debug for HDWP

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

Formats the value using the given formatter.

impl Display for HDWP

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

Formats the value using the given formatter.

impl Handle for HDWP

const NULL: Self

Available on crate feature kernel only.

The null, uninitialized handle; equals to 0.

const INVALID: Self

Available on crate feature kernel only.

The invalid handle; equals to -1.

unsafe fn from_ptr(p: *mut c_void) -> Self

Available on crate feature kernel only.

Constructs a new handle object by wrapping a pointer.

unsafe fn raw_copy(&self) -> Self

Available on crate feature kernel only.

Returns a raw copy of the underlying handle pointer.

unsafe fn as_mut(&mut self) -> &mut *mut c_void

Available on crate feature kernel only.

Returns a mutable reference to the underlying raw pointer.

fn ptr(&self) -> *mut c_void

Available on crate feature kernel only.

Returns the underlying raw pointer.

fn as_opt(&self) -> Option<&Self>

Available on crate feature kernel only.

Returns None if the handle is null or invalid, otherwise returns Some(&self).

impl Hash for HDWP

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl LowerHex for HDWP

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

Formats the value using the given formatter.

impl PartialEq for HDWP

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl UpperHex for HDWP

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

Formats the value using the given formatter.

impl Eq for HDWP

impl Send for HDWP

impl StructuralPartialEq for HDWP