77 lines
2.1 KiB
Text
77 lines
2.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{DragBoth}
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A simple drag-and-drop source and receiver@section{categories}
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GUI>Views
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@section{related}
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Classes/DragSink, Classes/DragSource
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@section{description}
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link::Classes/DragSource::, link::Classes/DragSink:: and link::Classes/DragBoth:: are a set of view classes intended as simple-to-use drag-and-drop sources and destinations. They are graphically represented as a simple rectangle, and their specialty is that they emphasis::do not require the Cmd/Ctrl key to be held down to initiate dragging::.
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Akin to link::Classes/StaticText:: they can store arbitrary content in the link::Classes/StaticText#-object#-object:: variable, and display it using link::Classes/Object#-asString::. You can set the displayed text separately using link::Classes/StaticText#-string#-string::, and keep it independent of the content if you set link::Classes/StaticText#-setBoth#-setBoth:: to
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@racketblock[false::.
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strong::DragBoth::, specifically, strong::accepts any:: dropped data and stores it into the strong::-object:: variable, as well as gives that variable as data strong::for dragging::.
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See: link::Classes/View#Drag and drop:: for a general description of the drag and drop mechanism.
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]
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@section{CLASSMETHODS}
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@section{PRIVATE}
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key
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@section{INSTANCEMETHODS}
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@section{METHOD}
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defaultGetDrag
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@section{RETURNS}
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The link::Classes/StaticText#-object#-object::.
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@section{METHOD}
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defaultCanReceiveDrag
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@section{RETURNS}
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Always True.
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@section{METHOD}
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defaultReceiveDrag
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Sets the link::Classes/StaticText#-object#-object:: to the current drag data.
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@section{EXAMPLES}
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@racketblock[
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(
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w = Window.new.front;
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w.addFlowLayout;
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// store various kinds of objects in the drag source
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// a string source
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a = DragBoth(w, Rect(10, 10, 150, 20)).align_(\center).background_(Color.rand);
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a.object = "drag us around";
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a = DragBoth(w, Rect(10, 10, 150, 20)).align_(\center).background_(Color.rand);
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a.object="SUPERCOLLIDER";
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8.do{
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a = DragBoth(w, Rect(10, 10, 150, 20)).align_(\center).background_(Color.rand);
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a.receiveDragHandler = { arg obj; obj.object = View.currentDrag.scramble };
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}
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)
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::
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]
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