HTk.Canvasitems.CanvasTag

Synopsis

Documentation

The CanvasTag datatype.

Instances

Eq CanvasTag
Destroyable CanvasTag	A canvas tag can be destroyed.
Synchronized CanvasTag	You can synchronize on a canvas tag.
GUIObject CanvasTag	Internal.
CanvasItem CanvasTag	A canvas tag is a canvas item (any canvas item is an instance of the abstract `class CanvasItem`).

class CanvasItem w => TaggedCanvasItem w whereSource

A canvas item can have several tags (handlers for a set of canvas items).

Methods

tags :: [CanvasTag] -> Config wSource

Instances

TaggedCanvasItem Arc	An arc item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem BitMapItem	A bitmap item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem ImageItem	A image item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem Line	A line item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem Oval	An oval item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem Polygon	A polygon item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem Rectangle	A rectangle item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem TextItem	A text item can have several tags (handlers for a set of canvas items).
TaggedCanvasItem EmbeddedCanvasWin	An embedded canvas window can have several tags (handlers for a set of canvas items).

data SearchSpec Source

The SearchSpec datatype (see CanvasTag.addCanvasTag).

allItems Source

Arguments

:: SearchSpec

A SearchSpec object.

Adds all objects in the canvas.

aboveItem Source

Arguments

:: CanvasItem item
=> item	the item below the item to add.
-> SearchSpec	A `SearchSpec` object.

Adds the item just above the given item in the display list.

belowItem Source

Arguments

:: CanvasItem item
=> item	the item above the item to add.
-> SearchSpec	A `SearchSpec` object.

Adds the item just below in the given item in the display list.

withTag Source

Arguments

:: CanvasItem item
=> item	the canvas item handler.
-> SearchSpec	A `SearchSpec` object.

Adds the item(s) identified by the given handler (which can also be another canvas tag).

closest Source

Arguments

:: Position	the concerned position.
-> SearchSpec	A `SearchSpec` object.

Adds the item closest to the given position.

enclosed Source

Arguments

:: Position	the upper left position of the region.
-> Position	the lower right position of the region.
-> SearchSpec	A `SearchSpec` object.

Adds the items enclosed in the specified region.

overlapping Source

Arguments

:: Position	the upper left position of the region.
-> Position	the lower right position of the region.
-> SearchSpec	A `SearchSpec` object.

Adds the items overpalling the specified region.

createCanvasTag Source

Arguments

:: Canvas	the parent canvas.
-> [Config CanvasTag]	the list of configuration options for this canvas tag.
-> IO CanvasTag	A canvas tag.

Constructs a new canvas tag.

addCanvasTag Source

Arguments

:: SearchSpec	the search specification.
-> CanvasTag	the tag to add items to.
-> IO ()	None.

Adds the canvas items identified by the SearchSpec to the tag.

removeCanvasTag Source

Arguments

:: CanvasItem i
=> i	the item to remove from the tag.
-> CanvasTag	the tag to remove the item from.
-> IO ()	None.

Removes a canvas item from a canvas tag.

(&#&)Source

Arguments

:: CanvasTag
-> CanvasTag
-> IO CanvasTag	new canvas tag corresponding to (t1&&t2)

Forms the conjunction of two canvas tags

(|#|)Source

Arguments

:: CanvasTag
-> CanvasTag
-> IO CanvasTag	new canvas tag corresponding to (t1\|\|t2)

Forms the disjunction of two canvas tags

(^#)Source

Arguments

:: CanvasTag
-> CanvasTag
-> IO CanvasTag	new canvas tag corresponding to (t1^t2) equals (!t1&&t2)\|\|(t1&&!t2)

Forms either - or of two canvas tags

tagNot Source

Arguments

:: CanvasTag
-> IO CanvasTag	new canvas tag corresponding to !t