![]() ![]() This document describes the basic drag and drop mechanism and outlines the approach used to enable it in custom controls. Drag and drop is similar in function to the clipboards cut and paste mechanism. setData ( "application/x-moz-file-promise-dest-filename" ,ĭataProvider. Drag and drop provides a simple visual mechanism which users can use to transfer information between and within applications. setData ( "application/x-moz-file-promise-url", URL ) ĬurrentEvent. setData ( "text/x-moz-url", URL ) ĬurrentEvent. currentEvent is an existing drag operation eventĬurrentEvent. Remy Lebeau at 4:01 Add a comment 1 You are missing DragAcceptFiles ( hwnd, TRUE ) Put it just before message loop. Next, you should set the text/uri-list data, and finally the text/plain data. Accepting files is off by default on ALL windows, you have to either include the WSEXACCEPTFILES window style (which CreateWindow () doesn't do), or call DragAcceptFiles () explicitly. The standard image type, such as image/jpeg, should come first, followed by the application/x-moz-file type. It is important to set the data in the right order, from most-specific to least-specific. The full source code is available in MDN's drag-and-drop repository (pull requests and/or issues are welcome). These steps are described below, including example code snippets. a target element for the file drop) and to define event handlers for the drop and dragover events. In fact, this a common way in which image files are dragged. The main steps to drag and drop are to define a drop zone (i.e. ![]() You should also include the application/x-moz-file type if the image is located on disk. When this stream is read, it should provide the data bits for the image, as if the image was a file of that type. The data should be an object which implements the nsIInputStream interface. In chrome or other privileged code, you may also use the image/jpeg, image/png or image/gif types, depending on the type of image. However, a data: URL is not usually useful in a text context, so you may wish to exclude the text/plain data in this situation. The data should be the URL of the image, or a data: URL if the image is not stored on a website or disk.Īs with links, the data for the text/plain type should also contain the URL. To do this, use the text/uri-list type as with other URLs. Instead, images are usually dragged only by their URLs. For example, if even just one of the selected items you are dragging is a folder and not a file, the app will not initiate the. A file or photo being transferred is not supported. Wait until this has finished, and then try again. A previous drag & drop file transfer is still in progress. In fact, Mozilla does not support direct image dragging on Mac or Linux. This indicates that you can't successfully drag files. ![]()
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