Handling Focus With Custom Controls?
Nov 3, 2011
I have a custom control I'm creating. When I click on it, it draws a dotted border and puts some nubs on it for resizing. This all works perfectly. Now I want it so when I click off of it, it deselects. I already have a variable to set up if it's selected or not and subs to draw/clear it. I just have to be able to detect when something else is selected or it gets clicked off of.
What I've Tried
My first and best solution to this was to use the LostFocus event, but, by custom control apparently won't let it fire. After some research, as far as I know, custom controls don't have Focus events because they are custom and could be changed (basically, you have to implement the focus events yourself).
My Question
Does anybody have a solution to either implement the focus events or a way to handle off clicking for custom controls?
Sources
Here is my controls current source:
Imports System.Drawing.Drawing2D
Public Class wDOMElement
Inherits Control
[Code]....
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Jan 10, 2011
I have a nested custom control that I need to set focus on. I have it all internally wired up to automatically set the focus when the form loads, but when it comes up on screen, the designated accept button for the parent form is in focus instead. Even when is disassociate the accept button it still does not set correctly. How can I ensure my desired control gets focus.
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Nov 8, 2011
If I have the following ListView, how can I attach a SelectedIndexChanged event listener to the DropDownList so I can perform a command on the respective object? Imagine I have a list of new users and I want to add them to a usergroup by selecting the group from the DropDownList.
<asp:ListView ID="NewUsers" runat="server" DataSourceID="NewUsersSDS" DataKeyNames="ID">
<LayoutTemplate>
[Code].....
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Mar 30, 2009
How do you accept key presses when the form does not have the focus? Do you need to use a different event?
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Mar 8, 2010
When debugging a program, instead of doing this on EVERY piece of code:
Try
MyFunction()
Catch ex as Exception
MsgBox(ex.Message)
End Try
Is there a way to apply that to everything error I encounter without writing it on every function/sub/etc?
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Jun 2, 2009
All of us use the try catch blocks. But what is the best way of handling errors within custom functions?Display a messagebox to the user when the exception is thrown (if possible within the function), or return a value indicating that an error was found within the function?
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Jul 24, 2010
I have a custom class which basically manages the program settings.
In it's New() event, I'm performing a check to see whether a value stored in My.Settings is the same as the default value (I made sure the value wasn't!), if not then it will perform a RaiseEvent ValueChanged().
On my form, I have an instance of the class declared "Private Withevents ProgramSettings as New clsProgramSettings", I also have a handler "Private Sub DoSomething() Handles ProgramSettings.ValueChanged" declared.
When I run the program the form gets loaded, the instance is created, the RaiseEvent is called, but the handler is not receiving the event?
I tried "Private Withevents ProgramSettings as clsProgramSettings", then creating the instance in the Form.Load(), but still no success!?
Is there something I'm doing wrong, or is there a problem with the IDE? I'm using VS 2010.
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Feb 12, 2012
Handling Events For An Array Of Controls
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Oct 21, 2009
So I've made this control that inherits from the treeview control and basically loads objects from active directory into a treeview (url...).All working fine, but as this is the first custom control I have made that I have intended for other people to use, I'm not quite sure how I should approach error handling.I mean, obviously I shouldnt do something like show any exceptions in a messagebox because that might not be what the person that is using the control wants to happen. So do I just write out exception messages to the debug window? Do I swallow exceptions (guessing not)? Do I just totally ignore them so that they are thrown in the user's project?
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Apr 18, 2012
I have written a code to generate numerous command button during runtime depend on the user selection. I would like to find out how do we handle the command button click event?
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Aug 18, 2009
I have a problem in handling the events for dynamically created controlsI am creating a combobox and a textbox dynamically when i click a Button1 for each combobox there is one corresponding textboxso the number of times i click Button1 i will get that many number of comboboxes and textboxes.i have added an Event handler to handle the ComboBox_SelectedIndexChangedWhenever i click any of the combobox the above event is triggered.So far it is working fine.Now comes the problem i have to get the selected item for each combobox in the appropriate textbox
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
combobox1 = New ComboBox
[code].....
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Aug 12, 2009
My application's binary serialization was working well up to today (this is not a released app yet - still in development). I have a "Project" class that is the top-level class of a hierarchy of other classes related to its function. And before you think it, yes, all of those classes are marked as serializable. Infact, they all were being serialized before today.
I have one event on the Project class that assists in informing when the project's save status has changed (i.e. new, modified, saved). This event was added today along with some events on the other classes that filter up to the Project class (the project needs to be told when its objects have been modified). I unfortunately added all of this at the same time so I can't provide any incremental details as to when it stopped working, but when I try to save the project through my binary formatter it tells me that my main form is not marked as serializable. Well, yeah... of course it isn't! it shouldn't need to be because there is no member of my classes that even mentions the form. But for some reason handling the Project's event on the form triggers this error.
Serializing the form is not a solution. Neither is not being able to handle my Project events. If I comment out the handler it works fine -- and I don't even have to remove the WithEvents keyword on my form's Project variable. Now that I write that I'm speculating that it may have to do with the event being raised as a result of the serialization (occurs when the save button is clicked).
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Mar 11, 2010
I've got a VB.NET form that's got a ListView control, Tab Control and custom control. Ideally want the ListView and Tab controls to be faded while the user is entering data in the custom control. It seems these sorts of control don't have any opacity settings. Is there any way to set the opacity?
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Oct 26, 2010
I am just getting into the learning curve of .net. I have thus many tinyl hitches to get some quick fix. Thus if my questions are dumb or too down right primitive, please pardon the novice.I have a few text boxes in a form1st QI want to get to a particular 1st_txtbox when the form opens. Hence in the load event i place a line: 1st_txtbox.focus()But on reopening the form the 2nd time, if user has already moved to 2nd_txtbox, the cursor gets to 2nd_txtbox. Where did i go wrong?
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Jan 5, 2012
Does anyone know if you can remove focus from all controls on a form so a user doesn't inadvertently cause action on a control when it's unintended such as hitting Enter at the same time your app appears causing some action to occur? Do you have to leave focus on at least one control?
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Apr 13, 2010
well i have 80 controls in my form including txtbox,combobox i have searched the forums and found some code as
[Code]...
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Feb 8, 2009
I have a form with transparent background (using png file).All controls placed over it becomes black at start then they change there color and comes to there original state on MouseHover. Its not the transparency keys problems since the transparency key color is different that controls back color. What can be the problem?
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Mar 27, 2010
i want to control my tab pages with custom buttons...now i want to hide my tabs from tab controls...
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Aug 1, 2010
I want to know how to add custom controls to vb.net.
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Dec 9, 2011
in VB.NET i have 2 custom controls, one is a TextBox and second one is a ComboBox.These have custom values like Bool _IsHidden and are added on runtime to a form.Now, at some point in the code I want to check if the _IsHidden is set to True or False and display that information. Since the user can edit this values when creating the control these are not set on creation.
So what I tried is:(all of this is on MDI Forms)
For Each frm as CustomForm in Main.MdiChildren If frm.MyName = calledBy Then 'this part is just to know which form called the form to create the object For Each cntrl as CustomTextBox in frm.Controls'DO Something
Next End if Next
Now.. if the first control is a custom ComboBox it thorws an error since it sees that it does not match the custom TextBox control..how do i get around this? By my understanding it should just go through all of the controls on the said form and just check those who match CustomTextBox control ?
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Nov 24, 2011
I've created custom buttons in a .dll and they work fine, so I thought I'd have a go at creating my own sort of listbox to replace the standard one in my applications. It's basically a panel with a few labels and a button (eliminating the need to select an item in standard listbox then click a seperate button). I want to add these panels to a panel on a form, at run-time, based on rows in a db.
If I try adding any arguments in the New() section of the class file it won't let me use the panel in my toolbox. Is there a way to pass arguments to custom controls, I need a new custom panel for each row in a db so need to pass an id to it to specify records; or even load the records in my application and create a new panel for each record, using info passed to it to fill in the labels on it. Or can I create the panel at run-time and refer to labels within the custom controls, setting their .text properties that way?
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Mar 19, 2011
I would like to expand my knowledge of VB.NET and was looking at creating custom user interfaces or custom controls. The type of things I am thinking of is: [URL]s. How are those controls created? I imagine it involves using the existing controls in Visual Studio as a starting point, and altering them to suit your design?
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Dec 10, 2010
I'm not going to post my code for my transparentlistbox class, but here is a link to it.It's been working fine as is, until early this morning when I tried to set a different size.[URl]..For the longest time I placed a normal listbox control on a form and resized that, setting a new public variable of transparentlistbox to the same size/location as the original listbox, setting the visibility of the original to false, and adding the transparentlistbox to the form (me.controls.add).It looked like this:
[Code]...
Now, since I've moved some buttons around on my main form, I resized the original listbox control to be wider (same height though). When I tested, the transparentlistbox (code didn't change still set to original listbox size/location), the size was that of what I had the original listbox set to, before resizing?
So, I commented out all of the custom drawing/paint events/etc I could find for the transparentlistbox and tested, still stuck to the original size. I stepped line by line debugging and verified that transparentlistbox1.size=listbox1.size indeed matched the new resized size (but didn't actually resize)?
Last I did was comment out the transparentlistbox.visible and put back the listbox1.visible and listbox1 does indeed show with the new resized size? I'm not quite sure what to test next?
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Nov 3, 2009
Is there a way to use SVG in vb.net to draw custom controls? Or any other way?
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Jun 19, 2012
Is it possible to have a custom control (inherits from Control) and add sub-controls to it (like, a label for example)? Basically I want a composite control. I know controls can contain other controls, but if I try to add a control to MyBase.Controls, this doesn't work because that's readonly.
[Code]...
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Oct 14, 2011
i need to create custom controls for my apps so how can I do that? Do I need a special software to do that?
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Jan 16, 2012
inherit from two classes in VB.net?We are developing Custom User Controls that inherits from say System.Web.UI.WebControls.Label. We are planning on implementing a bunch of these controls but they will share mostly the same additional properties. We are hopeful about centralising these properties.I have looked into interfaces but it seems they only 'contract' properties you need to implement.
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Apr 14, 2010
I've been working on a few large custom controls, and I noticed that when I use them, my memory starts ballooning. If I add a control at runtime, it increases the memory, but when I remove the control, it decreases less than it increased. However, it would stop balooning at some higher value. So if go back in forth between pages (which adds and removes the control), the memory would look something like this:
1,000K|5,000K|4,000K|9,000K|8,000K... 20,000K|25,000K|21,000K|25,000K|21,000K|25,000K... etc I know it takes a while for the GC to run, but the memory would stay consistantly high for long periods of time.
I tried writing a Closing routine, where when I called it, the control looped trhough its children and disposed all the internal controls, which seemed to help a little, but the memory after running the control and disposing was still much higher than before running the control. I also use custom event addhandlers. Should I remove all these as well. It would be nice if I received a little guidance on this.
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Dec 2, 2009
I am new to VB 2008 having spent most of my time in 2003. What is the recommendation for the best place to get a primer on creating custom controls in VB.NET. I prefer to use VB directly and not the WPF.
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May 12, 2010
I am getting this annoying warning message "Object reference not set to an instance of an object." all the time because I created several custom user controls and drag it to a Windows form in a vb.net Windows application. I am using vs 2005 and dot.net framework v 2.0. This message pop up when I try to save the projector when I try to debug it in the Design mode.
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