pub struct ChangeGCRequest<'input> {
    pub gc: Gcontext,
    pub value_list: Cow<'input, ChangeGCAux>,
}
Expand description

change graphics context components.

Changes the components specified by value_mask for the specified graphics context.

Fields

  • gc - The graphics context to change.
  • value_list - Values for each of the components specified in the bitmask value_mask. The order has to correspond to the order of possible value_mask bits. See the example.

Errors

  • Font - TODO: reasons?
  • GContext - TODO: reasons?
  • Match - TODO: reasons?
  • Pixmap - TODO: reasons?
  • Value - TODO: reasons?
  • Alloc - The X server could not allocate the requested resources (no memory?).

Example

/*
 * Changes the foreground color component of the specified graphics context.
 *
 */
void my_example(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t fg, uint32_t bg) {
    /* C99 allows us to use a compact way of changing a single component: */
    xcb_change_gc(conn, gc, XCB_GC_FOREGROUND, (uint32_t[]){ fg });

    /* The more explicit way. Beware that the order of values is important! */
    uint32_t mask = 0;
    mask |= XCB_GC_FOREGROUND;
    mask |= XCB_GC_BACKGROUND;

    uint32_t values[] = {
        fg,
        bg
    };
    xcb_change_gc(conn, gc, mask, values);
    xcb_flush(conn);
}

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§gc: Gcontext§value_list: Cow<'input, ChangeGCAux>

Implementations§

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impl<'input> ChangeGCRequest<'input>

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pub fn serialize(self) -> BufWithFds<[Cow<'input, [u8]>; 3]>

Serialize this request into bytes for the provided connection

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pub fn into_owned(self) -> ChangeGCRequest<'static>

Clone all borrowed data in this ChangeGCRequest.

Trait Implementations§

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impl<'input> Clone for ChangeGCRequest<'input>

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fn clone(&self) -> ChangeGCRequest<'input>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ChangeGCRequest<'_>

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

Formats the value using the given formatter. Read more
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impl<'input> Default for ChangeGCRequest<'input>

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fn default() -> ChangeGCRequest<'input>

Returns the “default value” for a type. Read more
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impl<'input> Request for ChangeGCRequest<'input>

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const EXTENSION_NAME: Option<&'static str> = None

The protocol name of the extension that this request belongs to, or None for core requests
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fn serialize(self, _major_opcode: u8) -> BufWithFds<Vec<u8>>

Serialize this request into its X11 protocol wire representation. Read more
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impl<'input> VoidRequest for ChangeGCRequest<'input>

Auto Trait Implementations§

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impl<'input> RefUnwindSafe for ChangeGCRequest<'input>

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impl<'input> Send for ChangeGCRequest<'input>

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impl<'input> Sync for ChangeGCRequest<'input>

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impl<'input> Unpin for ChangeGCRequest<'input>

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impl<'input> UnwindSafe for ChangeGCRequest<'input>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.