Dropshelf 1 3 3 – Makes Dragging And Dropping Easier

The first editing technique you need to learn in Excel 2013 is drag and drop. Drag and drop is primarily a technique for moving cell entries around a worksheet, you can adapt it to copy a cell selection, as well. React.js: implement the drag and drop feature without using external libraries Get into the details of implementing drag and drop features in React from scratch. So, easy even your dog can drag it:) Let's first see the result of what we will be building. I am trying out.gif — hopefully it works everywhere as expected.

After last week's post on the different drag & drop interaction examples, I had quite a few emails asking for tips on how to create drag and drop interactions for elearning. So now's a good time to review some good general tips for building drag and drop interactions.

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Why Are You Dragging?

Ok, so I'm taking my first stab at Drag-Drop functionality here. I've handled mouse down and called DoDragDrop from my source control. What I'm trying to achieve is copying/ moving an account from one MDI child to another. In my context it makes no sense whatsoever to drop.

There are a few reasons why we make onscreen objects draggable.

• Sliders are used as a means to make adjustments/selections or as a simple way to navigate content. They're fixed on a track.
• Move objects from one part of the screen to another. For example, planning a seating chart may require the user to move seats around or placing utensils on the table. These are freeform drag and drop interactions with no specific drop target.
• Targets are probably the most common use case where you have an object that needs to be placed in a very specific area.

Drag and Drop Interactions Tips

• Where is the user supposed to drag and drop the object? In most cases, drag and drop interactions require a drop target. Drop targets can be an actual object, or it may be an invisible element (like a hotspot) that controls where the dropped objects lands.

• Do you want the object to snap to the drop target? There are different ways to work with the drop target. Sometimes, things may not be quite as evident onscreen, snapping to the target helps when the user gets the object over the target.

• Do you want to make the target visible? This makes sense if there are a number of drag and drop options and you have a very clear target for each draggable object.

• What happens when the user drags an object out of position? I like to add a ghost image or something to show where the drag object originally came from. It's also an easy way to indicate progress.

• Are the instructions clear? Sometimes developers forget to put instructions for the interaction and what the user is to do. If you expect them to interact with the screen in a new way, you should include clear instructions. I like to use gate screens that stop the user and provides instructions.

Drag and Drop Interactions: Providing Feedback for Correct and Incorrect Actions

There are a few way to provide feedback when the user drops the object on a target.

• The easiest way is to allow the target to accept the object. Using a snap feature essentially pulls the dragged item to the target. That lets the user know that they've dropped the object on a target. And depending on how you structure the drag and drop interactions, it can also be the means to show feedback for a correct action.
• Another way to provide feedback to the user is to reject incorrect choices and cause the dropped object to return to the starting position.

• You can also provide immediate correct and incorrect feedback by changing the state of the object to reflect when it's a right or wrong decision.

Here are some previous posts that cover drag and drop interactions in a bit more detail:

Drag and drop interactions can help make course more engaging and interactive. Too often we limit ourselves to standard click-based interactions and decision-making. Next time, try to convert one of those to a drag and drop and see how it goes. What tips do you have for those creating drag and drop interactions? Share them in the comments section.

Free E-Learning Resources

Drag and drop is an intuitive way to transfer data within an application or between applications on the Windows desktop. Drag and drop lets the user transfer data between applications or within an application using a standard gesture (press-hold-and-pan with the finger or press-and-pan with a mouse or a stylus).

Important APIs: CanDrag property, AllowDrop property

The drag source, which is the application or area where the drag gesture is triggered, provides the data to be transferred by filling a data package object that can contain standard data formats, including text, RTF, HTML, bitmaps, storage items or custom data formats. The source also indicates the kind of operations it supports: copy, move or link. When the pointer is released, drop occurs. The drop target, which is the application or area underneath the pointer, processes the data package and returns the type of operation it performed.

During drag and drop, the drag UI provides a visual indication of the type of drag-and-drop operation that's taking place. This visual feedback is initially provided by the source but can be changed by the targets as the pointer moves over them.

Modern drag and drop is available on all devices that support UWP. It allows data transfer between or within any kind of application, including Classic Windows apps, although this article focuses on the XAML API for modern drag and drop. Once implemented, drag and drop works seamlessly in all directions, including app-to-app, app-to-desktop, and desktop-to app.

Here's an overview of what you need to do to enable drag and drop in your app:

1. Enable dragging on an element by setting its CanDrag property to true.
2. Build the data package. The system handles images and text automatically, but for other content, you'll need to handle the DragStarted and DragCompleted events and use them to construct your own data package.
3. Enable dropping by setting the AllowDrop property to true on all the elements that can receive dropped content.
4. Handle the DragOver event to let the system know what type of drag operations the element can receive.
5. Process the Drop event to receive the dropped content.

Enable dragging

To enable dragging on an element, set its CanDrag property to true. This make the element—and the elements it contains, in the case of collections like ListView—draggable.

Be specific about what's draggable. Users won't want to drag everything in your app, only certain items, such as images or text.

Here's how to set CanDrag.

You don't need to do any other work to allow dragging, unless you want to customize the UI (which is covered later in this article). Dropping requires a few more steps.

Construct a data package

In most cases, the system will construct a data package for you. The system automatically handles:

• Images
• Text

For other content, you'll need to handle the DragStarted and DragCompleted events and use them to construct your own DataPackage.

Enable dropping

The following markup shows how to set a specific area of the app as valid for dropping by using the AllowDrop in XAML. If a user tries to drop somewhere else, the system won't let them. If you want users to be able to drop items anywhere on your app, set the entire background as a drop target.

Handle the DragOver event

The DragOver event fires when a user has dragged an item over your app, but not yet dropped it. In this handler, you need to specify what kind of operations your app supports by using the AcceptedOperation property. Copy is the most common.

Process the Drop event

The Drop event occurs when the user releases items in a valid drop area. Process them by using the DataView property.

For simplicity in the example below, we'll assume the user dropped a single photo and access it directly. In reality, users can drop multiple items of varying formats simultaneously. Your app should handle this possibility by checking what types of files were dropped and how many there are, and process each accordingly. You should also consider notifying the user if they're trying to do something your app doesn't support.

For simplicity in the example below, we'll assume the user dropped a single photo and access it directly. In reality, users can drop multiple items of varying formats simultaneously. Your app should handle this possibility by checking what types of files were dropped and how many there are, and process each accordingly. You should also consider notifying the user if they're trying to do something your app doesn't support.

Customize the UI

The system provides a default UI for dragging and dropping. However, you can also choose to customize various parts of the UI by setting custom captions and glyphs, or by opting not to show a UI at all. To customize the UI, use the DragEventArgs.DragUIOverride property.

Open a context menu on an item you can drag with touch

When using touch, dragging a UIElement and opening its context menu share similar touch gestures; each begins with a press and hold. Here's how the system disambiguates between the two actions for elements in your app that support both:

• If a user presses and holds an item and begins dragging it within 500 milliseconds, the item is dragged and the context menu is not shown.
• If the user presses and holds but does not drag within 500 milliseconds, the context menu is opened.
• After the context menu is open, if the user tries to drag the item (without lifting their finger), the context menu is dismissed and the drag will start.

Designate an item in a ListView or GridView as a folder

You can specify a ListViewItem or GridViewItem as a folder. This is particularly useful for TreeView and File Explorer scenarios. To do so, explicitly set the AllowDrop property to True on that item.

The system will automatically show the appropriate animations for dropping into a folder versus a non-folder item. Your app code must continue to handle the Drop event on the folder item (as well as on the non-folder item) in order to update the data source and add the dropped item to the target folder.

Drop Shelf 1 3 3 – Makes Dragging And Dropping Easier Every

Enable drag and drop reordering within ListViews

ListViews support drag-based reordering out of the box, using an API very similar to the CanDrop API described in this article. At minimum, you add the AllowDrop and CanReorderItems properties.

See ListViewBase.CanReorderItems for more information.

Drop Shelf 1 3 3 – Makes Dragging And Dropping Easier To Be

Implementing custom drag and drop

Drop Shelf 1 3 3 – Makes Dragging And Dropping Easier People

The UIElement class does most of the work of implementing drag-and-drop for you. But if you want, you can implement your own version by using the APIs in the Windows.ApplicationModel.DataTransfer.DragDrop.Core namespace.

See also