ListModel | 用于 QML 项目的 C 列表模型
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kandi X-RAY | ListModel Summary
用于 QML 项目的 C++ 列表模型
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QUESTION
I created some entities using qt3d in QML. For example, this code shows a Scene3D
element that declares RootEntity
which is another QML element that contains the scene graph:
ANSWER
Answered 2021-Jun-13 at 17:22One approach is to maintain a global list of Qt.vector3d
elements and use it to record the position of the spheres that are removed with the "Undo" operation:
- When the user hits CTRL+Z, create a new
Qt.vector3d
object to store the position of the last sphere rendered (that is, the one that was last appended toentityModel
) and add that position to the global list of 3d vectors; - Then, to remove a sphere from the screen, call
entityModel.remove()
with the index of the sphere that needs to be erased;
The "Redo" operation simply does the opposite:
- When the user hits CTRL+Y, the last element of the global list of 3d vectors holds the location of the lastest sphere removed: append this position to
entityModel
so the sphere can be rendered again; - Then, remember to erase this position from the global list so the next Undo operation can render a different sphere;
RootEntity.qml:
QUESTION
I have the following example Qt Quick application:
...ANSWER
Answered 2021-Jun-02 at 11:37The interval is established through the mousePressAndHoldInterval()
of QStyleHints
, in this case the solution is to use the setter that seems to be undocumented.
QUESTION
I have a simple Qt Quick application containing a ListView with a few SwipeDelegates.
...ANSWER
Answered 2021-Jun-02 at 08:03If it's a style that supports palettes, you can set the relevant palette role. For the Default style ("Basic" in Qt 6), it assigns its background colour like so:
QUESTION
I'd like to automate putting a jTextField next to an ImageIcon on the same row basically, for as many rows as I'd like.
I need to do this process depending on how many images I provided as input that's why a manual solution doesn't work for me.
This is an example of what I'd like it to look like. As you can see, an image with a text field next to it for as many rows as I need:
i am working with Java Swing
here is what i tried now in this exemple :
...ANSWER
Answered 2021-May-30 at 00:01Here's the GUI I came up with.
To use this GUI, you would select the first row that you want to correct with the mouse, and type the corrected text into the row.
Press the Enter key to put your cursor on the next row. You can skip a row by pressing the Enter key without typing anything.
When you've made all the corrections, left-click on the Save Corrections button.
ExplanationWhen I create a Swing GUI, I use the model / view / controller (MVC) pattern. This pattern allows me to separate my concerns and focus on one part of the GUI at a time.
Using Java Swing, the MVC pattern is implemented this way:
- The view reads information from the model.
- The view does not update the model.
- The controller updates the model and repaints / revalidates the view.
There's usually not one controller class to "rule them all". Each ActionListener
acts as an independent controller.
For this project, I created two model classes, a view class, a JTable
cell renderer class, and one controller class.
I created two model classes. The ImageText
class holds an OCR image, the OCR text, and the corrected text. This keeps the corrections separate and allows easier verification of the correctness of the code.
The ImageTextModel
class holds a java.util.List
of ImageText
instances. Since you didn't provide any OCR image examples, I created some from the text. This is where you would read the OCR images and the OCR text and put the values into the List
.
I started the Swing application with a call to the SwingUtilities
invokeLater
method. This method ensures that all Swing components are created and executed on the Event Dispatch Thread.
I created one JFrame
and two JPanels
. The JFrame
methods must be executed in a specific order. This is the order I use for all my Swing applications.
The upper JPanel
holds the JTable
. The lower JPanel
holds the JButton
. The ImageCellRenderer
class allows me to display the BufferedImage
in the JTable
.
I use Swing layout managers to create the JPanels
and pack the JFrame
. This allows the layout managers to place the Swing components and make the JFrame
as small as possible.
The ButtonListener
class prints the corrected text. Here's where you would write the corrected OCR text to your file system.
Here's the complete runnable code. I made all the classes inner classes so I could post the code as one block.
QUESTION
I'm trying to write a kanban board. But if there are two and more stickers in one column, often the JToolBar with buttons will be shown only if you click on a sticker in this column for the firs time. I thought that there were some problems with coordinates, but I didn't found it. The StickerListener responds th event, even prints "условие работает" if coordinates are correct, but the JToolBar remainds invisible.
...ANSWER
Answered 2021-May-16 at 07:49The problem is in the control flow of the StickerListener.mouseClicked()
: you search the stickers to find the one that has been clicked.
Due to the if
/ else
you reset the toolbar for every sticker that has not been clicked, meaning that your code only works if you clicked on the last sticker (in order of iteration).
Your code will work if you move the code from the else
part before the loop (so that it executes only once):
QUESTION
I'm trying to sort a list model by splitting a string comparing the id's i have assigned to any given index and comparing it to another index, it works the first time I press the button however, if I press the button again it moves two indexes out of order.
Any help would be appreciated, if you need anything from me - please ask
An example of the string I'm splitting:
DRAMA,Harry Potter,2,5698750,J.K Rowling,500,08/12/2004,Lyle,0,0
The code that is giving me trouble
...ANSWER
Answered 2021-May-14 at 08:11One problem with that solution:
testing if compareTo
returns a positive value, no matter if x
is smaller or greater than y
.
Example, suppose we only have 2 ids ordered like ["2", "1"]
- if x=0, y=1
"2".compareTo("1")
will return >0
so both values are swapped resulting in ["1", "2"]
.
Some iterations later, x=1, y=0
so id[x]=="2", id[y]=="1"
, comparing ("2".compareTo("1")
) will again return >0
and the values will be swapped again.
Solution: y
should always be greater (or always smaller) than x
(e.g. for (int y = x + 1; ...
)
Using a debugger and executing step-by-step should help seeing what is happening...
QUESTION
I am trying to transfer CDListModel to my Today View but I can not do it properly. So that I can see how many reminders I have totally today in list.reminders.count. Right now I am getting 0
...ANSWER
Answered 2021-May-07 at 12:35You do not need to transfer data from another view to Today view. Because the data you need is already inside the core data so you can reach to data using
QUESTION
My aim is to show distance of plane to the coordinate as an item on the Map. Even tough I am able to display custom Rectangle components, I am having trouble to display MapQuickItem. I do not know where the problem is?
Edit: I think there is no problem on Box.qml. Please omit the property values that I did not passed to the component.
Box.qml
...ANSWER
Answered 2021-May-06 at 06:28Since the Box.qml file is local then it is not necessary to use the statusChanged so that simplifies the logic to:
distanceBoxCreation.js
QUESTION
This was my ModelsConfig
...ANSWER
Answered 2021-May-03 at 14:39In Core Data relationships are (NS)Set
s. For performance reasons they are unordered.
The easiest solution is to convert the set to an array
QUESTION
I've got a JList whose elements consist of image files for which I'm creating thumbnails (in a background Thread). When these thumbnails become available, I'd like to force a repaint of just that item. However, I find that when I use the listModel's fireDataChanged method (see below), all the visible items in the list are repainted (using my custom ListCellRenderer).
...ANSWER
Answered 2021-May-01 at 02:10Without some kind of runnable example which demonstrates your issue, it's impossible to make any concrete recommendations.
The following simple example makes use of a SwingWorker
to change the value of the elements within the ListModel
. To make it look more realistic, I've shuffled the List
of indices and applied a short delay between each.
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