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Introduction
Dragging-and-dropping is a common user interaction that you can find in many graphical user interfaces.
There are pre-existing JavaScript libraries for adding a drag-and-drop feature to your app. However, there may be situations where a library is not available or introduces an overhead or dependency that your project does not need. In these situations, knowledge of the APIs available to you in modern web browsers can offer alternative solutions.
$ begingroup$ @JZYL, higher aspect ratio reduces induced drag at cost of some increase in form drag. Induced drag decreases with square of speed, while form drag increases with square of speed. So high aspect ratio give better max L/D, but at lower speed, while at higher speed the total drag increases due to the higher form drag. @mrjj The empty space you see in the attached image is basically the layout which all PlayerControls are added to, held by a QGroupBox titled 'Players:'. That being said, do I have to configure my drag and drop functionality on the QGroupBox rather then the MultiTrackPlayer? This source of drag depends on the shape of the aircraft and is called form drag. As air flows around a body, the local velocity and pressure are changed. Since pressure is a measure of the momentum of the gas molecules and a change in momentum produces a force, a varying pressure distribution will produce a force on the body. It works on a spaced.mkv file here, but not if the.srt file has a space. If you can drag over a spaced filename successfully within Explorer, I would say Windows' drag and drop function is working. There's a difference is the logic between the.mkv and.srt blocks. Is that intentional? Space Drop: Better Drag & Drop 1.7.6. September 23, 2018; Productivity; Space Drop: Better Drag & Drop 1.7.6. AppStore QR-Code Space Drop: Better Drag & Drop. Developer: FIPLAB Ltd. Space Drop is an essential utility for Mac users who want to seriously speed up their workflow. Featured by Apple in ‘New Apps we.
The HTML Drag and Drop API relies on the DOM’s event model to get information on what is being dragged or dropped and to update that element on drag or drop. With JavaScript event handlers, you can turn any element into a draggable item or an item that can be dropped into.
In this tutorial, we will build a drag-and-drop example using the HTML Drag and Drop API with vanilla JavaScript to use the event handlers.
Prerequisites
To complete this tutorial, you will need:
- A modern web browser that supports the Drag and Drop API (Chrome 4+, Firefox 3.5+, Safari 3.1+, Edge 18+).
Step 1 — Creating the Project and Initial Markup
Our project will consist of a container with two types of child elements:
- Child elements that can you can drag
- Child elements that can have elements dropped into them
First, open your terminal window and create a new project directory:
Next, navigate to that directory:
Then, create an
index.html
file in that directory: Findings 2 0 7 download free.Next, add boilerplate code for a HTML webpage:
And between the
<body>
tags add your draggable
item and your dropzone
(drop target):index.html
Save and close the file. Then, create a
style.css
file:Next, add styles for the elements in our
index.html
file:This will add some formatting to the app. Now you can view
index.html
in the browser and observe that this produces a draggable
<div>
and a dropzone
<div>
.Next, we will explicitly make the first
<div>
draggable by adding the draggable
attribute:index.html
Space Drop: Better Drag & Drop 1 7 60
Save and close the file.
Finally, view
index.html
in the browser again. If we click on the draggable
<div>
and drag it across the screen, there should be a visual indication of it moving.The default value for the
draggable
attribute is auto
. That means whether the element is draggable will be determined by your browser’s default behavior. Typically this means text selections, images, and links are draggable without specifying draggable='true'
.You now have an HTML file with a draggable element. We will move on to adding
onevent
handlers.Step 2 — Handling Drag-and-Drop Events with JavaScript
Currently, if we release the mouse while dragging the draggable element, nothing happens. To trigger an action on drag or drop on DOM elements, we’ll need to utilize the Drag and Drop API:
ondragstart
: This event handler will be attached to ourdraggable
element and fire when adragstart
event occurs.ondragover
: This event handler will be attached to ourdropzone
element and fire when adragover
event occurs.ondrop
: This event handler will also be attached to ourdropzone
element and fire when adrop
event occurs.
Note: There are eight event handlers in total:
ondrag
, ondragend
, ondragenter
, ondragexit
, ondragleave
, ondragover
, ondragstart
, and ondrop
. For our example, we will not require them all.First, let’s reference a new
script.js
file in our index.html
:Next, create a new
script.js
file:The
DataTransfer
object will keep track of the information related to the current drag happening. To update our element on drag and on drop, we need to directly access the DataTransfer
object. To do this, we can select the dataTransfer
property from the DOM element’s DragEvent
.Note: The
DataTransfer
object can technically track information for multiple elements being dragged at the same time. For our example, we’ll focus on dragging one element.The
dataTransfer
object’s setData
method can be used to set the drag state information for your currently dragged element. It takes two parameters:- a string that declares the format of the second parameter
- the actual data being transferred
Our goal is to move our
draggable
element to a new parent element. We need to be able to select our draggable
element with a unique id
. We can set the id
of the dragged element with the setData
method so it can be used later.Let’s revisit our
script.js
file and create a new function to use setData
:script.js
Space Drop: Better Drag & Drop 1 7 64
Note: Internet Explorer 9 through 11 reportedly has problems with using
'text/plain'
. The format needs to 'text'
for that browser.To update the dragged item’s CSS styling, we can access its styles using the DOM event again and by setting whatever styles we want for the
currentTarget
.Let’s add to our function and change the
backgroundColor
to yellow
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Note: Any styles you change will need to be manually updated again on drop if you want drag-only styles. If you change anything when it starts dragging, the dragged element will keep that new styling unless you change it back.
Now, we have our JavaScript function for when dragging starts.
index.html
View
index.html
in your browser. If you try to drag your item now, the styling declared in our function will get applied:However, nothing will happen when you release your click.
The next event handler fired in this sequence is
ondragover
.The default drop behavior for certain DOM elements like
<div>
s in browsers typically does not accept dropping. This behavior will intercept the behavior we are attempting to implement. To ensure that we get the desired drop behavior, we will apply preventDefault
.Let’s revisit the
script.js
file and create a new function to use preventDefault
. Add this code to the end of the file:Now, we can add
ondragover
to our dropzone
element in index.html
:index.html
At this point, we still have not written code handle the actual dropping. The final event handler fired in this sequence is
ondrop
.Let’s revisit our
script.js
file and create a new function.We can reference the data we saved earlier with
dataTransfer
object’s setData
method. We will use dataTransfer
object’s getData
method. The data we set was the id
, so that’s what will be returned to us:Select our
draggable
element with the id
we retrieved:script.js
Select our
dropzone
element:Append our
draggable
element to the dropzone
:script.js
Reset our
dataTransfer
object:Now, we can add
ondrop
to our dropzone
element in index.html
:index.html
Once that’s done, we have a completed drag-and-drop feature. View
index.html
in your browser and drag the draggable
element to the dropzone
.Our example handles the scenario of a single draggable item and a single drop target. You can have multiple draggable items, multiple drop targets, and customize it with all the other Drag and Drop API event handlers.
Step 3 — Building an Advanced Example with Multiple Draggable Items
Here’s one more example of how you could use this API: a to-do list with draggable tasks that you can move from a
'To-do'
column to a 'Done'
column. To create your own to-do list, add more draggable elements with unique
id
s to index.html
:View
index.html
in your browser and drag the items in the To-do column to the Done column. You have created a to-do application and tested the functionality.Conclusion
In this article, you created a to-do app to explore the drag-and-drop functionality that is available to modern web browsers.
The Drag and Drop API provides multiple options for customizing your actions beyond dragging and dropping. For example, you can update the CSS styling of your dragged items. Also, instead of moving the item, you can choose to copy your draggable item so that it gets replicated on drop.
Bear in mind that while many web browsers support this technology, you may not be able to rely on it if your audience consists of devices that do not support this functionality.
To learn more about all you can drop with the Drag and Drop API, check out MDN’s docs on it.
This article introduces how to increase C drive space on Windows 10 without losing data. Drag and drop to increase C drive size by shrinking other volume.
Content:
Comparing with other data volumes, C drive is very likely running out of space. In that case, you can increase C drive space by getting unused space from other volume. Then there will be plenty of free space in C drive again without starting over. It is not difficult to achieve, but first you should use right tool.
Can't increase C drive by shrinking D in Windows 10
In fact, Windows 10 has native Disk Management which has the ability to change partition size without losing data. Shrink Volume is used to decrease partition size and release unused space. Extend Volume is used to increase partition size by adding Unallocated space.
However, Shrink Volume can only help shrink a partition to create new, Extend Volume can only help expand a partition by deleting the adjacent one behind it. If you want to increase C drive space by shrinking D via Windows 10 Disk Management, it is impossible.
Ignore this paragraph if you have no interest to this Windows built-in utility.
Extend Volume can only expand a partition when there is adjacent Unallocated space on its right side, but Shrink Volume cannot make Unallocated space on the left side when shrinking other partition.
As you see, Unallocated space is produced on the right side of D after shrinking this partition. Drive C is non adjacent to it and E is on its right side, so Extend Volume is disabled for both drives.
If there is a tool that can make Unallocated space on the left side of D, or move Unallocated to the end, then drive C and E can be extended.
Drag and drop to increase C drive size in Windows 10
Comparing with Windows Disk Management, NIUBI Partition Editor is much more powerful. It can make Unallocated space on either side when shrinking. Unallocated space can be combined to either adjacent partition directly. If you want to extend any non adjacent partition, you can move Unallocated space first. All that you need to do is dragging and dropping on the disk map.
Download NIUBI and you'll see all hard disks with graphical partition layout and detailed parameters.
Steps to increase C: drive space in Windows 10:
Step 1: right click the adjacent drive D and select 'Resize/Move Volume', drag left border towards right in the pop-up window.
20GB Unallocated space is make on the left side of drive D.
Step 2: right click partition C and select 'Resize/Move Volume' again, drag right border towards right to combine Unallocated space.
C drive size is increased from 30GB to 50GB.
NIUBI uses virtual mode technology to avoid wrong operations, all operations you do will be listed as pending on bottom left for preview, undo and redo. Real disk partitions won't be modified until click Apply to confirm.
If you want to increase space of C drive from nonadjacent partitions such as E, it is similar. Shrink E and make Unallocated space on its left side, however, there is an additional step to move Unallocated space before expanding C drive:
Right click drive D and select 'Resize/Move Volume', drag middle position towards right in the pop-up window. Scherlokk 3 3 – find and compare files free.
Then Unallocated space will be moved behind C drive.
If you have shrank volume D via Windows 10 Disk Management, use the same method to move and add Unallocated space to C drive.
How to increase partition C with other disk
No partitioning software can increase C drive size by adding unused or existing Unallocated space from another disk. If there is no data volumes, or not enough free space in other data volume, you may clone this disk to a larger one with NIUBI Partition Editor.
Extra disk space will be shown as Unallocated space on the end of this larger disk, then you can increase size of C drive (and other partitions).
Find out your disk partition configuration and use corresponding method to increase C drive space on Windows 10.