102 lines
3.6 KiB
Text
102 lines
3.6 KiB
Text
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class:: DragSource
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summary:: A simple drag-and-drop source.
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categories:: GUI>Views
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related:: Classes/DragSink, Classes/DragBoth
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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 code::false::.
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strong::DragSource::, specifically, gives the strong::-object:: variable as the data strong::for dragging::, but strong::accepts no drop::.
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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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CLASSMETHODS::
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PRIVATE:: key
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INSTANCEMETHODS::
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METHOD:: defaultGetDrag
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RETURNS:: The link::Classes/StaticText#-object#-object::.
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EXAMPLES::
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code::
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(
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s.waitForBoot({ // only needed if you are using sound
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w = Window.new.front;
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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 = DragSource(w, Rect(10, 10, 150, 20)).align_(\center);
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a.object = "I am a string source";
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// a Float source
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b = DragSource(w, Rect(10, 40, 150, 20)).align_(\center);
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b.object = 2.234;
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// a Point source
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c = DragSource(w, Rect(10, 70, 150, 20)).align_(\center);
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c.object = Point(20, 30);
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// A sound function source
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// dragLabel_() is used for the label while dragging
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d = DragSource(w, Rect(10, 100, 150, 20)).align_(\center);
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d.object = { Synth(\default) };
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d.dragLabel = " I am a sound function.\n My dragLabel_() is set \n to inform you about that ";
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// A sound function source
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// here the string label is independent of the content type (Function)
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// dragLabel_() is used for the label while dragging
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f = DragSource(w, Rect(10, 130, 150, 20)).align_(\center).setBoth_(false);
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f.object = { { SinOsc.ar(440,0,0.4) }.play };
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f.string = "My label is independent";
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f.dragLabel = " My dragLabel_() says \n I am dragging a sound function ";
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// receive anything
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g = DragSink(w, Rect(170, 10, 200, 20)).align_(\center);
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g.string = "receive anything, do nothing";
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// receive only floats
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g = DragSink(w, Rect(170, 40, 200, 20)).align_(\center);
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g.string = "I only like floats";
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g.canReceiveDragHandler = { View.currentDrag.isFloat };
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// receive only numbers and points, and convert them to rects
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h = DragSink(w, Rect(170, 70, 200, 20)).align_(\center);
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h.string = "I convert to Rect";
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h.canReceiveDragHandler = { View.currentDrag.isKindOf(Number) || View.currentDrag.isKindOf(Point) };
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h.receiveDragHandler = { arg v; h.object = View.currentDrag.asRect };
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// receive only functions, and try to play them
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i = DragSink(w, Rect(170, 100, 200, 20)).align_(\center);
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i.string = "I evaluate a (sound) function";
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i.canReceiveDragHandler = { View.currentDrag.isKindOf(Function) };
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i.receiveDragHandler = { arg v;
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i.object = View.currentDrag.value;
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i.string = "click here for silence";
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i.background_(Color.red)};
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i.mouseDownAction_({
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i.object.free;
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i.string = "I evaluate a (sound) function";
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i.background_(Color.clear) });
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StaticText(w, Rect(10, 200, 380, 50))
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.stringColor_(Color.white)
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.string_("Try dragging any item on the left -----> to any item on the right");
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});
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)
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::
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