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CanvasTag

Synopsis

module CanvasItem data CanvasTag class (CanvasItem w) => TaggedCanvasItem w where tags :: [CanvasTag] -> Config w data SearchSpec allItems :: SearchSpec aboveItem :: (CanvasItem item) => item -> SearchSpec belowItem :: (CanvasItem item) => item -> SearchSpec withTag :: (CanvasItem item) => item -> SearchSpec closest :: Position -> SearchSpec enclosed :: Position -> Position -> SearchSpec overlapping :: Position -> Position -> SearchSpec createCanvasTag :: Canvas -> [Config CanvasTag] -> IO CanvasTag addCanvasTag :: SearchSpec -> CanvasTag -> IO () removeCanvasTag :: (CanvasItem i) => i -> CanvasTag -> IO ()

Documentation

module CanvasItem

data CanvasTag

The CanvasTag datatype.

class (CanvasItem w) => TaggedCanvasItem w where

A canvas item can have several tags (handlers for a set of canvas items). Methods tags :: [CanvasTag] -> Config w Sets the tags for the specified canvas item. Instances TaggedCanvasItem Arc TaggedCanvasItem BitMapItem TaggedCanvasItem EmbeddedCanvasWin TaggedCanvasItem ImageItem TaggedCanvasItem Line TaggedCanvasItem Oval TaggedCanvasItem Polygon TaggedCanvasItem Rectangle TaggedCanvasItem TextItem

data SearchSpec

The SearchSpec datatype (see CanvasTag.addCanvasTag).

allItems

:: SearchSpec A SearchSpec object. Adds all objects in the canvas.

aboveItem

:: (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

:: (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

:: (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

:: Position the concerned position. -> SearchSpec A SearchSpec object. Adds the item closest to the given position.

enclosed

:: 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

:: 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

:: 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 :: SearchSpec -> CanvasTag -> IO ()

removeCanvasTag

:: (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.

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