This special type of file drag is called a promise because the drag operation contains a promise from the source to the destination that the source will create the specified files if the drag and drop is accepted. When the drag and drop operation is complete, it tells the source where it wants the files saved and the dragging source creates the files. In these cases, the drag and drop gesture serves the purpose of specifying the location at which to save the new file. It could be a new document that hasn't been saved yet or a file that exists on a remote server or on the web. MacOS supports the concept of dragging a file before it actually exists in the file system. See the notes for the DesktopListBox control for more information on dragging from ListBoxes. Like TextAreas, the DragItem is created automatically for the ListBox but you must populate the DragItem in the DragRow event handler. ListBoxes support the dragging of rows automatically if the EnableDrag property of the DesktopListBox is True (checked). There is no need to create a DragItem for TextAreas as this is handled automatically. See the example of dragging from one DesktopListBox to another. If you make up a four-character Type (not an existing Macintosh resource type), you can prevent a control from receiving dragged text from other sources. You can also use RawData or PrivateRawData to control internal drag and drop. Typically, this will mean that you will have to make API calls or use a plug-in that is designed to handle the data format. It is up to the control or window that receives the DragItem to manage it. RawData and PrivateRawData return the dragged item as a string. You specify the data format using a four-character Type, corresponding to a Macintosh resource type. The RawData and PrivateRawData properties allow you to support drag and drop for other data formats. For example, if you wanted a drag item to contain two separate pictures, you would assign one picture to the Picture property then call the AddItem method to add a row and then assign the second picture to the Picture property. Using the AddItem method, you can add more rows to the DragItem allowing multiple entries of the same data type. The DragItem supports UTIs (Uniform Type Identifiers).īy default, a DragItem can contain only one row containing a single entry for each data type. Other types of data can be dragged using the RawData property. Pictures can be dragged to the Desktop to create picture clipping files. For example, text can be dragged to the desktop to create a text clipping file or any application that accepts dropped text (like SimpleText or the NotePad). Xojo supports true drag and drop - which means that the recipient of the data can be anything that supports drag and drop and supports the kind of data being dragged. When the user wishes to drag some data from a DesktopWindow or control, a new DragItem object must be created to hold that data in order to transfer it to the object the data will be dropped on. In an ImageViewer control, put this code in the MouseDown event: This code sets the DragPicture property just after creating the new DragItem. It is only possible to change the DragPicture before calling Drag(), any attempt to do so after that point will fail. The image will be placed at the top left of the rectangle passed into the DragItem constructor. If you assign an image to this property, the picture will be used for the drag instead of the default rectangle. NativePath ) End If End If Else MessageBox ( "Unable to get FolderItem for temporary file." ) End If Destination IsA FolderItem Then MessageBox ( FolderItem ( di. Close di = New DragItem ( Self, 0, 0, 100, 100 ) di. Write ( "Howdy! Created by DragToFinder example." ) tos. TotalSeconds, "#" )) If f Nil Then tos = TextOutputStream. Now Var tos As TextoutputStream f = SpecialFolder. Var di As DragItem Var f As FolderItem Var d As DateTime = DateTime. Reporting bugs and making feature requests.
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