I'm writing a simple text editor client that receives a given file in chunks, instead of reading it all in at once. For example, if I have a 10,000 line file, I'll only get the first 25 lines + some slop when I open it up in the client. As I scroll down the file, it'll load the lines that come into view dynamically.
I've got the dynamic insertion of the file contents working as I scroll around the file. However, I want the QScrollBar to reflect the full size of the file when a file is opened, instead of just the current contents of the QTextDocument.
Here it is in screenshot form:
The QTextEdit and QScrollBar when a file is initially loaded with just the first chunk of lines.
The same thing, once I've scrolled to the bottom of the file and the rest of it has been loaded.
Note the smaller QScrollBar slider.
I'm wondering if there's some kind of way to preset the size of the underlying canvas, i.e. it would be easy to calculate the height of the full document in pixels, and then make the QTextEdit scroll area that size. Preferably without having to resort to painting. Any other ideas are also welcome.
You need to start with programmatically setting the range of the vertical scrollbar:
textEdit->verticalScrollBar()->setMaximum(numberOfLines);
See the documentation for more details: QAbstractSlider::setMaximum()
In addition, you will probably need to implement custom behavior when the QAbstractSlider::sliderMoved(int) signal is emitted. The idea is that your canvas stays small, it only provides a small window on the complete text.
Related
I'm trying to make a text reader/pseudo-command-line a la man, but I'm having difficulty making the text scroll the way I'd like it to. At first I was having trouble getting new text to appear while scrolling, but eventually I found that pads would fix that for me, and I'm currently integrating them.
My question is, how can I get text to wrap within the pad? My program currently automatically refreshes when it is resized, so defining the pad to have as many columns as the terminal wouldn't fix everything. Can I get the pad to automatically resize itself as needed when my terminal receives a KEY_RESIZE? Not just the displayed size, but the size of the pad as well, such that text is pushed down a row due to the end of the pad. Additionally, will resizing it still keep the text, moving it down rows if necessary, or will I need to refresh the content of the pad?
Unfortunately, I'm having trouble finding resources with these details, and the documentation in ncurses doesn't elaborate on the behavior of resizing a pad.
Thanks a lot!
Edit after answered: ncurses doesn't do this, so I'm going to try instead making some arrays of strings, one to store the text from the file (broken at \n), and another for the line wrapping (refreshed on KEY_RESIZE, with each string having a max length of the terminal rows), parts of which are printed to the body window based on scrolling position and such. I'm making this edit so anyone else seeing this problem in the future can see what my solution is. I haven't done this yet, so I'll edit this again if it fails. Thanks again to Stack Overflow for helping with this!
ncurses will not do what you intend in this case:
A pad is like a window, true, and addch will wrap -- but the viewport which you are using to display data in the pad is not a window, and wrapping at the right side of the pad is not necessarily related to that viewport.
Once the text has wrapped, ncurses will not remember what that was, and re-wrap text if you resize the window (or pad).
A pad is mainly useful when you want to display just part of a window, e.g., if the screen is not large enough for the text you want to display.
If you want to resize and re-wrap, your program should allow for rewriting all of the text in the window (to lay it out as you intend) and not rely on ncurses to decide how to re-wrap text.
I wanted to wrap the existing text of checkbox into multiline if the width of row exceeds the width of its parent window. I am not really sure how to do that.
The image I want to show the checkbox string
The image where the string is cropped and only shows if window is resized or maximized
You are going to have a problem with this I am afraid.
The setting for making a checkbox multiline is ES_MULTILINE and if you look here you will see that it states:
To create an edit control using the CreateWindow or CreateWindowEx function, specify the EDIT class, appropriate window style constants, and a combination of the following edit control styles. After the control has been created, these styles cannot be modified, except as noted.
So, it would seem to me that you have three ways forward, depending on what you feel is the best or most elegant for you.
Set your control in the resource editor as multiline anyway. Then it doesn't matter and will wrap. No need to have to change the setting.
Implement the needed functionality to limit the size the window can be reduced to. I can show you how if you are interested. This way, if you set the control resize properties correctly it can resize larger but only reduce down the a known dimension (ie: the dimensions you created it in the resource editor).
Possibly have two controls in the same place, one as multiline and one as single. And when you decide which you want to show, swap the visibility. But I think this is a bad idea, bit of a headache, and not worth the hassle.
IMHO I would do both ideas 1 and 2 and I would happily extend my answer to provide more information.
Update
Having looked at your images and the comments about translations then there is a fourth idea. If you use a third party application to manage the translations and use satellite DLL files then you can adjust the resources on a language by language basis. I sometimes have to make the default width for some windows wider due to their verbose nature.
I have set BS_MULTILINE for the checkbox. The minimum size of the window is fixed but I just want the checkbox to fit in that. I expect it to show at least one word in the same line as other labels and remaining words in second line. So I am checking if the total width of the first row is greater than the width of window then show the string with \r\n in it else show normal string. However, I want to align first line or the first word of the checkbox with the checkbox and remaining words should come below the first word. Currently, the checkbox is in between two lines which looks weird. Is there anyway I can do this?
I'm trying to retrieve file icons on Windows. I follow this guide http://pogopixels.com/blog/getting-the-48x48-or-256x256-icon-of-a-file-on-windows/
I use SHIL_JUMBO to get the maximum size possible. However, not all icons returned are big enough, such as the QuickTime icon in the attached image. The size of the whole pixmap returned is still 256x256 but it does not fill the entire space. My program will then scale it down, making it too tiny to see.
I'm wondering if I can retrieve some extra info such as the size of the original icon, so I know that it's too small to scale down.
MFC doesn't have layouts, so controls have to be fixed size and position.
When localizing for a new language, I edit the .rc files directly, but if the text for the new language is longer than the control's width will allow, it gets truncated.
This requires me to do manual inspection of each control to see if it has sufficient width, which is both time-consuming and error-prone.
Right now I'm thinking about adding some code to enumerate all controls, get their text, and see what its width would be, and compare that to the control's width.
Is there a better way?
Actually you can handle this by using following example of layout,
Layout Manager for Dialogs, Formviews, DialogBars and PropertyPages.Check the size of max text and re-arrange controls according to control.Hope it will work.
I'm developing a Qt application and it's currently in an internal beta test. One member of the company has Windows configured to display text larger than its normal size, which breaks my UI. The About page, for example, currently looks like this:
but under his settings, looks like this (note the clipped text):
Coming from a C#/Winforms background, I'm amazed that I can't seem to find some easily configurable label property such as Form.AutoSize that will automatically size the labels to fit their containing text. I've tried messing with sizePolicy, scaledContents, and a few other properties, but none seem to do this.
I've come across various threads (such as this one) which give instructions for scaling the text to the label, but I want to do the opposite - scale the label to the text to facilitate for those with enlarged text settings like my co-worker. Is there a straightforward way to do this?
There are at least three solutions to this problem.
Use layouts. Their contents are scaled according to the size of the window.
Make a code which is executed whenever window size is changed. In that code, you get the width of the longest text in the window (How?)(another way) and then set window wider than that.
Do the same as in solution #2, but execute the code only when the dialog is shown. After that, alter the window properties so that its size cannot be changed.