C# - Detect Why A Form "disappears"
May 24, 2012
In a large old application I have to fix, I have two forms, like in the image (that is a Notepad example)
When I leave (with mouse cursor) my small(Y) form's area, that form will "disappear", some like I'd clicked on the big form and activated it.
But I didn't click on X, neither the X caption is active, however the small Y form goes backward and is not visible anymore.
How to track the problem?
Any of Resize, Activated, Deactivate, LostFocus, GotFocus, GiveFeedback, MdiChildActivate is not tracked on any of both forms when I leave the Y area...
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Apr 4, 2011
For a while i have been playing a guessing game with this line of code.
If Sdown = True And Shooter.Top >= Me.ClientRectangle.Height Then
Shooter.top += Shooterspeed
End If
Basically i have a shooter on the form and whenever i press the down key the shooter moves down the form and disappears off of the bottom of the form. I have been trying to get this to stop for some while.
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Feb 24, 2009
I have a form that I am using to search for records in a dataset, it has a text box for entry of the search criteria and a 'Search' button to initiate the editing of the entry and .Filter on the BindingSource. This is one form in a project with many, when I show it using .ShowDialog it always disappears, (not visible and not loaded) after the 'Search' button is clicked, I have stepped through and there is no .Hide or .Close that it encounters, it performs all of the logic correctly but control is returned to the main form it was shown from. When I use the .Show method, I do not have this problem.
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Jul 30, 2010
I am working on a web browser with the url bar in a tool strip.I have noticed that whenever I resized it, the textbox stayed the same.
[code]...
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Jun 18, 2009
This happened to be once awhile ago and I thought I had the solution, but apparently I don't. Very rare, but what happens is, I'll start a new project, build my controls on the form, go into the code window and write some code. I'll save this all out, but when I reload the project, the code window comes up OK, but the design window is just gone. The code for the form and all the controls is still there in the form.designer window, but the form itself just will not appear, and there is no icon for it over in the Solution Explorer to click on
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Jul 24, 2009
I have a custom UserControl that I am hosting inside a FlowLayoutPanel. Each time that I run the application the control will disappear off the hosting form's design view. I have to close the form's design view and then reopen it each time. The control is not getting removed in any way, just isn't being shown.
Edit, alright this got a bit weirder. Only the first usercontrol that I put into the FlowLayoutPanel disappears. This problem also happens on a project Build and Rebuild.
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Dec 8, 2011
I have a report (vb.net - rdlc) and I have two buttons - preview (which brings up a preview window) and print which allows me to print the report directly to my default printer with no interface whatso ever.When I call the print the calling form disappears or at least goes behind any other open windows - ie if I have MS word open my whole programme would go behind word and I loose focus)I found the code on the net to print directly and it is basically creating a stream to do the printing. [code]
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Nov 14, 2009
I am making a program for easily entering maths symbols. For entering the powers, I superscipted the text in richtext box, but whenver I use another symbol, the effect of superscripting disappears and the text becomes in its original form
[Code]...
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Mar 27, 2011
I need to detect shift + arrow key in blank form. But it's not working. I also tried overriding IsInputKey method but it only detects single key press (like arrow key) but when multiple key are pressed it simply doesn't work.
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May 31, 2009
I guess no need for further description... here's my other post for app that i'm makeing
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Jun 10, 2012
I have one form which stays open, and lots of other forms which can are opened and closed regularly how can i detect that a form has closed on the main form?
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Feb 20, 2011
I am trying to discover how to detect that a form has been resized, or rather, that a form is being resized. I need to call a sub to handle the resizing of text in relation to the new size of a form or control. I have found that setting a minimum height and width works behind the scene so I figure there must be something watching the form size but can't find what or where it is.
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Aug 13, 2010
Any way to get the cursor style outside of the vb form?
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Jan 26, 2009
Ok before I get flamed hear me out. I have a form with panels containing tablelayoutpanels containing various amounts of controls that alternate visibility. On the form in its entirety I am looking at roughly 3200 controls most of which are radio buttons.
Now that being said, I am trying to figure out a way to capture what control (mainly radiobutton) is being clicked on through the forms events. So far my attempts have failed with mousedown, mouseclick, etc. Yes I know I can use the "handles radiobutton1.Clicked" event directly. However with that many radiobuttons....I know that there has to be a better way to do this. An API, windows hook, something. So far my efforts to find an alternative method have failed.
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Feb 19, 2012
just now I was trying to capture the F1 key on the form, but only managed when the form is selected, and I need to detect it in any form control. I used this code:
Select Case e.KeyCode
Case Keys.F1
MsgBox("Right")
e.Handled = True
End Select
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May 28, 2009
I'm making an app that will be able to repeat the user's mouse movement, and also clicks.I have managed to repeat the movement but i have no idea where to start in detecting click outside of form..
[Code]...
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Aug 13, 2010
I need a way to detect when a child form has been closed. I've created an MdiWindowList thing (but in the form of a toolbar with buttons, similarly to the Windows taskbar), and everything works great, but the method I have for refreshing the taskbar's windows has to be called when a child form closes. I've trying calling the method from the child's Form_Closing event, but there's a slight lag so whenever there's more than 1 window open the first one gets skipped (then the others close properly, since the taskbar is being refreshed first before the form actually closes).
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Mar 9, 2010
I want to detect if a window form is open and if it is then I would like to bring it in front rather than opening it again. I know I need a form collection for this but I want to know if there is a built in form collection that holds all the forms in VB.NET or I need to implement my own.
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Dec 1, 2010
I have developed a Component and I want it to be able to detect when it's running in the IDE.
Or, let me rephrase that - I want my component to be able to detect when its parent form is running in the IDE.
I can use .DesignMode and a few other methods to detect when my component is running in the IDE (For example when my component is placed on a form etc)
But when the parent form is executed from within the IDE then .DesignMode returns false.
Is it possible for a component to detect if its parent (the form) was started via an IDE/Designer ? or via the command line/start menu or what ?
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Jan 2, 2010
What is happening now: i click the area in the taskbar which "belongs" to my form, while it is being shown, the form remains "shown"
what i hope to get done: if the form is "shown" and i click the taskbar of my form, i want it hidden
could we detect click event of the form's area in the taskbar?
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Aug 27, 2010
if any one knows of a way to determine if a control is currently in the viewable area of the parent form. In example...if I have a form where all controls are visible when the form is maximized, how would I go about determining which controls are no longer visible to the user after they change the window state or form size. To be clear I am not talking about the visible property of a control but rather if the control is actually on screen for the user to see when they do something like resize the main form for instance.
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Jan 16, 2009
I have been searching the forums but I keep finding ways to cause events to occur when a key is pressed. I'm trying to get a true/false if the "ctrl" + "L" keys are pressed when the form loads so it know whether to show itself or close
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Jan 12, 2012
I have created a User Control and would like to be able to detect when the user clicks on the Form.I have seen this question which is related but the suggestion to use the the Leave event doesn't always do what I want because the focus doesn't necessarily change when the user clicks the Form (my control could be the only control on the Form in which case focus stays with my control).I want to be able to do something like this from within the User Control:[code]
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Jan 8, 2010
I have searched everywhere, and have not found an answer. I would like to know how to enable your form to detect if a process is started. Something like this:
If Process.Start("Process.exe") Then
MsgBox("Process is running")
Else
MsgBox("Process is not running")
End If
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Jan 4, 2012
I know you have to use WM_EXITSIZEMOVE or whatever it is, but I'm just not really sure how to use messages properly...I've read a few things online but just can't get it to work properly.
I'm looking into making child forms dockable inside my parent form and want to know when to hide my dock labels again (after the child form has stopped being moved).
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Feb 5, 2012
Anybody know a way to detect and set the form size in the child and MDIParent forms?
I'm having all kinds of problems from scroll bars popping up, to can't get the form to fill the parent. Pretty sure I have tried every possible combination in the forms properties 10 times.
I'm really getting tired of beating myself against this. Anybody seen a good tutorial on the finer points of MDIparent / MDI Child page size, etc.
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Jun 21, 2010
Way to detect the windows version, form say 95 to win7, in vb.net? pardon my ignorance but im not a big coder and norm only do python.
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Mar 27, 2010
[URL] In my Windows Form, I wanted the user to give an option to draw all over the form. But, if the user while drawing, enters the region 1, I want to assign a value to variable, say a=1. Correspondingly, if the user without leaving the mouse button previously enter the region 4, I want to b=1.After the user leaves the mouse button, I wanted to compare a and b. If both of them are equal, then Result=Done else not.
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Oct 2, 2009
I am currently investigating vb gaming and have set up a test project to move an object; it moves fine. The problem is that when it reaches the edge of the form it continues to move and eventually leaves the form entirely. So my question is how do i work out if my object has touched the edge of the form?
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Sep 3, 2010
there is any event or way to detect activity in an form or project?in the form and all the child controls.
mainly mouse clicks (not mousemove) and key press.
for example, if the form have not activity in the lasts 10 minutes, do something.
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