54 lines
4.1 KiB
Plaintext
54 lines
4.1 KiB
Plaintext
caption: draggable
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created: 20170406081938627
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modified: 20220715120213777
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tags: Widgets TriggeringWidgets
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title: DraggableWidget
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type: text/vnd.tiddlywiki
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The DraggableWidget creates a DOM element that can be dragged by the user. It only works on browsers that support drag and drop, which typically means desktop browsers, but [[there are workarounds|Mobile Drag And Drop Shim Plugin]].
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The draggable element can be assigned a list of tiddlers that are used as the payload.
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If desired it can invoke actions when dragging starts and when it ends.
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See DragAndDropMechanism for an overview.
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! Content and Attributes
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|!Attribute |!Description |
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|tiddler |Optional title of the payload tiddler for the drag |
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|filter |Optional filter defining the payload tiddlers for the drag |
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|tag |Optional tag to override the default "div" element created by the widget|
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|selector|<<.from-version 5.2.2>> Optional CSS Selector to identify a DOM element within the widget that will be used as the drag handle |
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|class |Optional CSS classes to assign to the DOM element created by the widget. The class `tc-draggable` is added to the the DOM element created by the widget unless the <<.param selector>> attribute is used. The class `tc-dragging` is applied to the DOM element created by the widget while the element is being dragged |
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|enable |<<.from-version 5.2.3>> Optional value "no" to disable the draggable functionality (defaults to "yes") |
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|startactions |Optional action string that gets invoked when dragging ''starts'' |
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|endactions |Optional action string that gets invoked when dragging ''ends'' |
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|dragimagetype |<<.from-version "5.2.0">> Optional type of drag image: `dom` (the default) or `blank` to disable the drag image |
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Either or both of the ''tiddler'' and ''filter'' attributes must be specified in order for there to be a payload to drag.
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The [[actionTiddler Variable]] is accessible in both //startactions// and //endactions//. It holds the payload tiddler(s) specified through the //tiddler// and //filter// attributes as a [[Title List]] using double square brackets to quote titles that include whitespace.
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<<.tip """Note that the [[actionTiddler Variable]] holds a [[Title List]] quoted with double square brackets. This is unlike the DroppableWidget which uses the same variable to pass a single unquoted title.""">>
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<<.tip """When specifying a DOM node to use as the drag handle with the <<.param selector>> attribute, give it the class `tc-draggable` in order for it to have the appropriate cursor and the attribute `draggable` with the value `true` to make it draggable.""">>
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The LinkWidget incorporates the functionality of the DraggableWidget via the ''draggable'' attribute.
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<<.from-version 5.2.3>> The following variables are accessible in the //startactions// and the //endactions//:
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|!Variables |!Description |
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|`modifier` |The [[modifier Variable]] contains the Modifier Key held while dragging |
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|`dom-*` |All DOM attributes of the node being dragged are made available as variables, with the prefix `dom-` |
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|`tv-popup-coords` |A relative co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated (see [[Coordinate Systems]] for more information) |
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|`tv-popup-abs-coords` |<<.from-version "5.2.4">> An absolute co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated (see [[Coordinate Systems]] for more information) |
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|`tv-selectednode-posx` |`x` offset position of the dragged DOM node |
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|`tv-selectednode-posy` |`y` offset position of the dragged DOM node |
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|`tv-selectednode-width` |`offsetWidth` of the dragged DOM node |
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|`tv-selectednode-height` |`offsetHeight` of the dragged DOM node |
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|`event-fromselected-posx` |`x` position of the event relative to the dragged DOM node |
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|`event-fromselected-posy` |`y` position of the event relative to the dragged DOM node |
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|`event-fromviewport-posx` |`x` position of the event relative to the viewport |
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|`event-fromviewport-posy` |`y` position of the event relative to the viewport |
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