Tkinter drag and drop


  • qt designer python
  • PyQt5 How To Make Drag And Drop Application
  • Qt Documentation
  • Drag and Drop Images With The Mouse – Python Tkinter GUI Tutorial #71
  • Python Tkinter drag and drop
  • qt designer python

    You probably used it to transfer some files from one folder to another this week! The wxPython GUI toolkit provides drag and drop functionality baked in. In this tutorial, we'll see just how easy it is to implement! Getting Started wxPython provides several different kinds of drag and drop. You can have one of the following types: wx. FileDropTarget wx.

    TextDropTarget wx. PyDropTarget The first two are pretty self-explanatory. The last one, wx. PyDropTarget, is just a loose wrapper around wx.

    DropTarget itself. It adds a couple extra convenience methods that the plain wx. DropTarget doesn't have. We'll start with a wx. FileDropTarget example. You do have to override a method to make it work right, but other than that, it's pretty straight forward. Let's take a moment to look over this example code and then we'll spend some time explaining it.

    SetInsertionPointEnd self. BoxSizer wx. Add lbl, 0, wx. ALL, 5 sizer. Add self. ALL, 5 self. SetSizer sizer def SetInsertionPointEnd self : """ Put insertion point at end of text control to prevent overwriting """ self.

    SetInsertionPointEnd def updateText self, text : """ Write text to the text control """ self. WriteText text class DnDFrame wx. MainLoop That wasn't too bad, was it? The first thing to do is to subclass wx. Inside that we have one overridden method, OnDropFiles. To hook up the drop target to the text control, you'll want to look in the DnDPanel class where we call the text control's SetDropTarget method and set it to an instance of our drop target class.

    We have two more methods in our panel class that the drop target class calls to update the text control: SetInsertionPointEnd and updateText. Note that since we are passing the panel object as the drop target, we can call these methods whatever we want to.

    If the TextCtrl had been the drop target, we'd have to do it differently, which we will see in our next example! TextDropTarget is used when you want to be able to drag and drop some selected text into a text control. Probably one of the most common examples is dragging a URL on a web page up to the address bar or some text up into the search box in Firefox.

    Let's spend some time learning how to create one of these kinds of drop targets in wxPython! DragCopy class DnDPanel wx. SetSizer sizer def WriteText self, text : self. MainLoop Once again we have to subclass our drop target class. In this case, we call it MyTextDropTarget. I was unable to find satisfactory documentation on the latter, but I'm guessing it just returns a copy of the data dragged.

    The OnDropText method writes text out to the text control. Note that since we've bound the drop target directly to the text control see the panel class we HAVE to use a method named WriteText to update the text control. If you change it, you'll receive an error message. The fun bit about this demo is that you not only get to create a widget that can accept dragged text but you also can drag some text from another widget back to your browser!

    URLDataObject ; self. SetDataObject self. DragLink def OnData self, x, y, d : if not self. GetData : return wx. GetURL self. Font 12, wx. SWISS, wx. SetFont font self. Bind wx. Add firstSizer, 0, wx. Add secondSizer, 0, wx. TextCtrl : sizer. Add widget, 1, wx. ALL, 5 else: sizer. Add widget, 0, wx. ALL, 5 return sizer def OnStartDrag self, evt : """""" if evt. URLDataObject data. DropSource self. MainLoop The first class is our drop target class.

    Here we create a wx. In our panel class, we hook up the drop target in the same way that we did in the other two examples, so we'll skip that and go on to the new stuff. The second text control is where we need to pay attention. In the mouse movement event handler OnStartDrag , we check to make sure that the user is dragging.

    Next we create an instance of a DropSource and pass it our second text control since it IS the source. Finally we call DoDragDrop on our drop source the text control which will respond by moving, copying, canceling or failing. If you dragged the URL to your browser's address bar, it will copy. Otherwise it probably won't work. Now let's take what we've learned and create something original! We'll be showing the following information: file name, creation date, modified date and file size.

    SetObjects self. We have our FileDropTarget subclass, we connect the panel to it and then the ObjectListView widget to the drop target instance. We also have a generic class for holding our file-related data. If you run this program and drop folders into it, you won't receive the correct file size. You would probably need to walk the folder and add up the sizes of the files therein to get that to work.

    Feel free to fix that on your own. Anyway, the meat of the program is in the updateDisplay method. Here we grab the file's vital statistics and convert them into more readable formats as most people don't understand dates that are in seconds since the epoch.

    Once we've massaged the data a bit, we display it. Now wasn't that pretty cool? Wrapping Up At this point, you should now know how to do at least 3 different types of drag and drop in wxPython. Hopefully you will use this new information responsibly and create some fresh open source applications in the near future. Good luck! Further Reading.

    PyQt5 How To Make Drag And Drop Application

    Event which is sent when a drag and drop action is completed Configuration The QStyleHints object provides some properties that are related to drag and drop operations: QStyleHints::startDragTime describes the amount of time in milliseconds that the user must hold down a mouse button over an object before a drag will begin.

    QStyleHints::startDragDistance indicates how far the user has to move the mouse while holding down a mouse button before the movement will be interpreted as dragging. A value of 0 means that there is no such limit. These quantities provide sensible default values that are compliant with the underlying windowing system for you to use if you provide drag and drop support in your controls.

    Dragging To start a drag, create a QDrag object, and call its exec function. In most applications, it is a good idea to begin a drag and drop operation only after a mouse button has been pressed and the cursor has been moved a certain distance. These indicate how the operation ended, and are described in more detail below.

    Note that the exec function does not block the main event loop. This function trades accuracy for speed, and is usually suitable for this purpose. Dropping To be able to receive media dropped on a widget, call setAcceptDrops true for the widget, and reimplement the dragEnterEvent and dropEvent event handler functions. In a real world application, it may be necessary to return from the dropEvent function without accepting the proposed action or handling the data if the action is not relevant.

    For example, we may choose to ignore Qt::LinkAction actions if we do not support links to external sources in our application. Overriding Proposed Actions We may also ignore the proposed action, and perform some other action on the data. To do this, we would call the event object's setDropAction with the preferred action from Qt::DropAction before calling accept.

    This ensures that the replacement drop action is used instead of the proposed action. For more sophisticated applications, reimplementing dragMoveEvent and dragLeaveEvent will let you make certain parts of your widgets sensitive to drop events, and give you more control over drag and drop in your application.

    Subclassing Complex Widgets Certain standard Qt widgets provide their own support for drag and drop. When subclassing these widgets, it may be necessary to reimplement dragMoveEvent in addition to dragEnterEvent and dropEvent to prevent the base class from providing default drag and drop handling, and to handle any special cases you are interested in.

    Drag and Drop Actions In the simplest case, the target of a drag and drop action receives a copy of the data being dragged, and the source decides whether to delete the original. This is described by the CopyAction action. The target may also choose to handle other actions, specifically the MoveAction and LinkAction actions. If the source calls QDrag::exec , and it returns MoveAction, the source is responsible for deleting any original data if it chooses to do so.

    The target is responsible for taking ownership of the data sent in the drag and drop operation; this is usually done by keeping references to the data. If the target understands the LinkAction action, it should store its own reference to the original information; the source does not need to perform any further processing on the data. The most common use of drag and drop actions is when performing a Move within the same widget; see the section on Drop Actions for more information about this feature.

    Any type of information can be transferred in a drag and drop operation. To drag information between applications, the applications must be able to indicate to each other which data formats they can accept and which they can produce. This is achieved using MIME types. The QDrag object constructed by the source contains a list of MIME types that it uses to represent the data ordered from most appropriate to least appropriate , and the drop target uses one of these to access the data.

    For common data types, the convenience functions handle the MIME types used transparently but, for custom data types, it is necessary to state them explicitly. Using standard MIME types maximizes the interoperability of your application with other software now and in the future. Note that custom datatypes used in item views must be declared as meta objects and that stream operators for them must be implemented.

    Drop Actions In the clipboard model, the user can cut or copy the source information, then later paste it. Similarly in the drag and drop model, the user can drag a copy of the information or they can drag the information itself to a new place moving it. The drag and drop model has an additional complication for the programmer: The program doesn't know whether the user wants to cut or copy the information until the operation is complete. This often makes no difference when dragging information between applications, but within an application it is important to check which drop action was used.

    We can reimplement the mouseMoveEvent for a widget, and start a drag and drop operation with a combination of possible drop actions. The proposed drop actions can be filtered in a widget's dragMoveEvent function. As mentioned above in the section on Overriding Proposed Actions , it is sometimes necessary to override the proposed drop action and choose a different one from the selection of possible drop actions.

    To do this, you need to check for the presence of each action in the value supplied by the event's possibleActions , set the drop action with setDropAction , and call accept.

    Drop Rectangles The widget's dragMoveEvent can be used to restrict drops to certain parts of the widget by only accepting the proposed drop actions when the cursor is within those areas. The Clipboard Applications can also communicate with each other by putting data on the clipboard. To access this, you need to obtain a QClipboard object from the QApplication object. The QMimeData class is used to represent data that is transferred to and from the clipboard. To put data on the clipboard, you can use the setText , setImage , and setPixmap convenience functions for common data types.

    These functions are similar to those found in the QMimeData class, except that they also take an additional argument that controls where the data is stored: If Clipboard is specified, the data is placed on the clipboard; if Selection is specified, the data is placed in the mouse selection on X11 only. By default, data is put on the clipboard. Construct a QMimeData object and set data with setData function in the way described in the previous section; this object can then be put on the clipboard with the setMimeData function.

    The QClipboard class can notify the application about changes to the data it contains via its dataChanged signal.

    Add widget, 1, wx. ALL, 5 else: sizer. Add widget, 0, wx. ALL, 5 return sizer def OnStartDrag self, evt : """""" if evt. URLDataObject data. DropSource self. MainLoop The first class is our drop target class. Here we create a wx. In our panel class, we hook up the drop target in the same way that we did in the other two examples, so we'll skip that and go on to the new stuff. The second text control is where we need to pay attention. In the mouse movement event handler OnStartDragwe check to make sure that the user is dragging.

    Next we create an instance of a DropSource and pass it our second text control since it IS the source. Finally we call DoDragDrop on our drop source the text control which will respond by moving, copying, canceling or failing. If you dragged the URL to your browser's address bar, it will copy. Otherwise it probably won't work. Now let's take what we've learned and create something original!

    We'll be showing the following information: file name, creation date, modified date and file size. SetObjects self. We have our FileDropTarget subclass, we connect the panel to it and then the ObjectListView widget to the drop target instance.

    We also have a generic class for holding our file-related data. If you run this program and drop folders into it, you won't receive the correct file size. You would probably need to walk the folder and add up the sizes of the files therein to get that to work. Feel free to fix that on your own.

    Anyway, the meat of the program is in the updateDisplay method. Here we grab the file's vital statistics and convert them into more readable formats as most people don't understand dates that are in seconds since the epoch.

    Qt Documentation

    Once we've massaged the data a bit, we display it. Now wasn't that pretty cool? Wrapping Up At this point, you should now know how to do at least 3 different types of drag and drop in wxPython. Hopefully you will use this new information responsibly and create some fresh open source applications in the near future.

    Drag and Drop Images With The Mouse – Python Tkinter GUI Tutorial #71

    This is achieved using MIME types. The QDrag object constructed by the source contains a list of MIME types that it uses to represent the data ordered from most appropriate to least appropriateand the drop target uses one of these to access the data.

    For common data types, the convenience functions handle the MIME types used transparently but, for custom data types, it is necessary to state them explicitly. Using standard MIME types maximizes the interoperability of your application with other software now and in the future. Note that custom datatypes used in item views must be declared as meta objects and that stream operators for them must be implemented. Drop Actions In the clipboard model, the user can cut or copy the source information, then later paste it.

    Similarly in the drag and drop model, the user can drag a copy of the information or they can drag the information itself to a new place moving it. The drag and drop model has an additional complication for the programmer: The program doesn't know whether the user wants to cut or copy the information until the operation is complete. This often makes no difference when dragging information between applications, but within an application it is important to check which drop action was used.

    We can reimplement the mouseMoveEvent for a widget, and start a drag and drop operation with a combination of possible drop actions. The proposed drop actions can be filtered in a widget's dragMoveEvent function. As mentioned above in the section on Overriding Proposed Actionsit is sometimes necessary to override the proposed drop action and choose a different one from the selection of possible drop actions.

    Python Tkinter drag and drop

    To do this, you need to check for the presence of each action in the value supplied by the event's possibleActionsset the drop action with setDropActionand call accept. Drop Rectangles The widget's dragMoveEvent can be used to restrict drops to certain parts of the widget by only accepting the proposed drop actions when the cursor is within those areas. The Clipboard Applications can also communicate with each other by putting data on the clipboard.

    To access this, you need to obtain a QClipboard object from the QApplication object. Python Tkinter Drag and Drop Folder In this picture, you can see that folder is dragged and dropped in the entry box.

    Now the path is displayed on the entry box. There are various options to do so like pygubu, visualtk, etc. We personally recommend visualtk. The reason behind it, it is online and works perfectly. You can easily drag and drop the widgets on the screen and then once you have completed the designing you can switch to the Code tab. You can see the autogenerated code for the application. We have attached the picture of visualtk. You can see how a simple interface can be used to create an effective application.

    Python Tkinter Drag and Drop ide Here is the screenshot of the code section for the above program. This code is generated automatically. Treeview is the tabular representation of data. It also allows creating parent-child objects. Click on the below click to read more about Python Tkinter Treeview.


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