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Sentiment analysis indicates that your post is not to be taken seriously due to its lack of capitals, improper punctuation, tone, etc.
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Here[^] you go.
This space for rent
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Member 12875047 wrote: please help
Help on what ?
You gave a question a problem ?
Patrice
“Everything should be made as simple as possible, but no simpler.” Albert Einstein
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Hi, I'm creating a custom VScrollBar and I have problem getting the exact Y position of the thumb like the Windows.Forms.VScrollBar, I have searched online and I found some examples of custom scrollbars like:
How to skin scrollbars for Panels, in C#[^]
Custom Drawn Scrollbar[^]
The problem with these examples are that they don't get the exact top position of the thumb comparing to the windows scrollbar. I am getting a Top position that while scrolling becomes less than the real position
Doesn't anyone know how to calculate this?
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Member 10498254 wrote: Doesn't anyone know how to calculate this?
How are you calculating it?
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I'm calculating it like this
decimal ratio = (decimal)((ClientRectangle.Height) - 2 * topButton.Height - ThumbSize()) / (Maximum - Minimum);
int thumbTopPosition = (int)((Value - Minimum) * ratio) + topButton.Height;
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And what is wrong with the result?
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the problem is that the Y position I get is smaller than the position of the Windows Scrollbar.
I tested my custom scrollbar with the Windows scrollbar with the same Maximum, Minimum, LargeChange and SmallChange, and when I get a Y position of 45 the other has a Y position little bit bigger than 45. The difference between the Y positions gets bigger as a set the Maximum value bigger.
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I can only assume that your calculation is missing or adding something that Windows includes/excludes.
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I'm thinking exactly the same. I'm missing something that windows includes. I hope I can figure it out.
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and what is in the ThumbSize method?
I would avoid the decimal type, what you need is either float or double, since ratio could be a very small number; decimal is fine for monetary amounts, not for arbitrary scaling. Have you ever looked at the actual values while debugging?
modified 31-Dec-16 8:05am.
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Hi Richard, all is fine, except for the scrollbar never reaching the bottom...
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this is what is inside thumbSize. it works pretty well.
int trackHeight = (Height - (2 * topButton.Height));
int thumbHeight = (LargeChange / Maximum) * trackHeight;
I changed the values from decimal to float I'm still getting the same result. the thumb never reaches the bottom. I think there must be something else to add to the thumb position than I'm not adding.
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If you can't reach the scroll's bottom, it means ratio is too small. As your math seems OK, I can imagine only two reasons:
1. a rounding down error, probably caused by a bad choice of data type (such as decimal only offering two fractional digits);
2. ThumbSize() returing too large a value; so please check and/or provide the exact code for that method.
Suggestion: take one example, note all the numbers, compare what they are (from logging or interactive debug session) with what they should be (manual calculation), you then should be able to see the error right away!
PS: ClientHeight isn't always the right value, e.g. when a HScrollBar appears, it reduces the VScrollBar's height!
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I just solved the problem. it was the data type getting a rounding down error. You were right. Thanks for your help
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You're welcome
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Hello those who are reading, I am a beginner in programmer and currently frequent in C#. I am working on building a cross-platform mobile application and I am confused on what to do. I know what I want my application to do and I am done with making the sketches and connecting them. Now I do not know how to proceed. ANY HELP/ADVICE WILL BE VERY APPRECIATED. THANK YOU.
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Member 12929001 wrote: I am working on building a cross-platform mobile application and I am confused on what to do.
That comes as no surprise. You've taken on a task that's challenging even for an experienced programmer! I suggest you instead focus on learning the basics of programming, select a target platform like Windows command line or Windows Forms, and eventually learn how to program for a mobile platform like iOS or Android. One step at a time.
Good luck!
/ravi
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And in addition to what Ravi says, posting the same "question" in multiple places doesn't get you a better answer: it just duplicates work and annoys people.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I started working on a project with some guys who are using Visual Studio Code.
I've not much experience with it, but I'd like to use my VS 2015 as usual because there seems to be all kinds of features lacking from VSC that I use a lot. It seems to have no concept of namespaces, and I can write a class that doesn't exist yet and it won't turn red, etc...
I try to open the folder in Visual Studio 2015 by going to File -> Open Web Site and doing it that way, and then all hell breaks loose. I know it needs to make .sln and csproj which is fine, but Resharper races my CPU for like 5 minutes straight and then there is no project resources area so even main VS has absolutely no idea about the namespaces, classes, etc...
Does anyone know how I could use VS to work on this C# .NET Core project, alternatively if I can get some VS features in VSC? This is sort of baffling my mind how challenging opening this C# project has become. Regards.
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It states that Visual Studio Code supports only a "limited subset" of VS project types.
If you "guys" are going to succeed at working together, you better agree on a common IDE and source code manager / version control.
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How do I implement a Window app to maximize when user moves the window from one display monitor to another. When the move occurs LocationChanged event is triggered and the window state becomes Normal.
I tried this.WindowState=FormWindowState.Maximized in the LocationChanged handler. However, the window does not maximized. Likely because it triggered circular reference. I had also implemented a module Boolean variable to avoid this. However, the window never maximized.
What is the proper way to implement this?
Thank you in advance for your response.
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