HTk.Canvasitems.CanvasItem

The module CanvasItem exports basic classes and general functionality on canvas items.

Documentation

data Canvas

The Canvas datatype.

Instances

Eq Canvas

Destroyable Canvas

A canvas widget can be destroyed.

Synchronized Canvas

You can synchronize on a canvas object (in JAVA style).

GUIObject Canvas

Internal.

HasEnable Canvas

A canvas widget is a stateful widget, it can be enabled or disabled.

HasBorder Canvas

A canvas widget has a configureable border.

HasSize Canvas

You can specify the size of a canvas.

HasColour Canvas

A canvas widget has a foreground and background colour.

HasTooltip Canvas

A canvas can have a tooltip (only displayed if you are using tixwish).

Widget Canvas

A canvas widget has standard widget properties (concerning focus, cursor).

HasPostscript Canvas

The contents of a canvas is printable.

Container Canvas

A canvas is also a container for widgets, because it can contain widgets in embedded windows.

HasScroller Canvas

A canvas is a scrollable widget.

GUIObject c => HasBBox Canvas c

You can request the bounding box size of a canvas item (use a canvas tag for the bounding box of a set of items).

class HasCoords w where

You can set the coords (position / size) of a canvas item on the parent canvas.

Methods

coord :: Coord -> Config w

getCoord :: w -> IO Coord

Instances

CanvasItem w => HasCoords w

Any canvas item has coords on the parent canvas.

class GUIObject w => CanvasItem w

Any canvas item is an instance of the abstract class CanvasItem.

Instances

CanvasItem CanvasTag

A canvas tag is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem Arc

An arc is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem BitMapItem

A bitmap item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem ImageItem

An image item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem Line

A line item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem Oval

An oval item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem Polygon

A polygon item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem Rectangle

A rectangle item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem TextItem

A text item is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

CanvasItem EmbeddedCanvasWin

An embedded canvas window is a canvas item (any canvas item is an instance of the abstract class CanvasItem).

class CanvasItem w => FilledCanvasItem w where

Any canvas item has a filling, outline, outline width and stipple configuration.

Methods

filling :: ColourDesignator c => c -> Config w

getFilling :: w -> IO Colour

outline :: ColourDesignator c => c -> Config w

getOutline :: w -> IO Colour

stipple :: BitMapHandle -> Config w

getStipple :: w -> IO BitMapHandle

outlinewidth :: Distance -> Config w

getOutlineWidth :: w -> IO Distance

Instances

FilledCanvasItem Arc

An arc is a filled canvas item (it has filling, outline, outline width, and stipple configurations).

FilledCanvasItem BitMapItem

A bitmap item is a filled canvas item (it has filling, outline, outline width, and stipple configurations).

FilledCanvasItem Line

A line item has filling, outline width and stipple configurations.

FilledCanvasItem Oval

An oval item is a filled canvas item (it has filling, outline, outline width, and stipple configurations).

FilledCanvasItem Polygon

A polygon item is a filled canvas item (it has filling, outline, outline width, and stipple configurations).

FilledCanvasItem Rectangle

A rectangle item is a filled canvas item (it has filling, outline, outline width, and stipple configurations).

FilledCanvasItem TextItem

An oval item is a filled canvas item (it has filling, outline width, and stipple configurations).

class CanvasItem w => SegmentedCanvasItem w where

Segmented canvas items have a splinesteps and smooth configuration.

Methods

splinesteps :: Int -> Config w

getSplinesteps :: w -> IO Int

smooth :: Bool -> Config w

getSmooth :: w -> IO Bool

Instances

SegmentedCanvasItem Line

A line is a segmented canvas item. It has a splinesteps and smooth configuration.

SegmentedCanvasItem Polygon

A line is a segmented canvas item. It has a splinesteps and smooth configuration.

moveItem :: (Synchronized w, CanvasItem w) => w -> Distance -> Distance -> IO ()

Moves a canvas item horizontally and vertically by the given distances.

scaleItem :: (Synchronized w, CanvasItem w) => w -> Distance -> Distance -> Double -> Double -> IO ()

Scales a canvas item horizontally and vertically by the given distances.

raiseItem :: (CanvasItem ci, CanvasItem w) => ci -> w -> IO ()

Moves an item above another item in the display list.

lowerItem :: (CanvasItem ci, CanvasItem w) => ci -> w -> IO ()

Moves an item below another item in the display list.

putItemOnTop :: CanvasItem w => w -> IO ()

Puts an item on top of the display list.

putItemAtBottom :: CanvasItem ci => ci -> IO ()

Puts an items at bottom of the display list.

itemsNotOnSameCanvas :: IOError

Exception raised by CanasItem.onSameCanvas.

declVar :: CanvasTagOrID -> TclScript

Retrieve all tagnames in a complex tag expression and declare them global in form of a TclScript

declVarList :: CanvasTagOrID -> TclCmd

Retrieve all tagnames in a complex tag expression and declare them global in form of a TclCmd