Java desktop application development learning (six) - drag the file to get the file path

Drag get file path

In windows software, many software provides drag a file to open the file functions, in JavaFx also have this feature, it is achieved through the listener

Monitor

• setOnDragDetected (new EventHandler ());
  When you drag from a Node, it detects the drag operation will be performed this EventHandler.

• setOnDragEntered (new EventHandler ());
  When you drag target control when this event will execute the callback.

• setOnDragExited (new EventHandler ());
  When you drag out of the target control, perform this operation.

• setOnDragOver (new EventHandler ());
  When you drag over the target time, will not stop the execution.

• setOnDragDropped (new EventHandler ());
  When you release the mouse button and drag to the target time to implement this DragDropped event.

• setOnDragDone (new EventHandler ());
  When you drag and let go of time to implement Drag to complete the operation.

I use a method fxml binding events, the above setOnDragDroppedand setOnDragDoneset methods, but just could not execute, I do not know why. I finally used setOnDragExitedthe listener.

Code

Let's set the listener through fxml in.
It can be set directly in the scenebuilder direct method

or another fxml file, write the code onDragExited="#getFile", and then to create getFile method can be.

@FXML
void getFile(DragEvent event) {
    List<File> files = event.getDragboard().getFiles();
    //获得文件
    File file = files.get(0);
    //之后的相关操作，获得文件路径等..
}

Reference material