We have a vb.net 2010 application with a base form and an inherited form When we change the position of a control coded on the inherited form we lose handles on the events in the inherited form for that control. We also lose the handles on the Load event in the inherited form.
View 9 RepliesJust about every day as I build my app and run/test it, I click on a control (button, grid, anything) and nothing happens.I double-click the control in design mode, and it's like clicking on a new control, no code is there.It turns out that the control loses the part of the line of code.[code]This has happened so often that I know I'm not deleting it accidentally.
View 8 RepliesI have a base form and I inherit other forms from it. However, if i go back and change say the size of the base form, I don't see those changes take effect in my inherited forms. Does anyone know why that is? Is there a solution to this issue?So as far as design is goes, what exactly gets inherited by other forms?
View 9 RepliesI had a question about handling multiple events in a sub, like this:
Private Sub Form1_MouseUpOrDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp, Me.MouseDown
'do something
End Sub
Once the sub is called, is there any way to tell which event called it? (Whether it was a MouseDown or a MouseUp event?) Right now, I am doing a work-around as follows... having each event call the same sub and pass the info in. But it would be nice to not have that overhead.
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
ExecuteMouseUpOrDown(EventTypes.MouseDown, sender, e)
End Sub
[CODE]...
Don't use ACCESS, EXCEL, or a TEXT FILE as a database. If you want your program to use a "local database", without any of the hassle of setting up a MS SQL or MySQL server, just click this link: >>> SQLite <<<.
i have a datagridview in which i want to know which row is selected by mousedown or keydown.. so in both case i want to use only ONE subroutine which can give e.rowindex , e.colindex value of datagridview...
Example..
Private Sub xyz (s as sender, e as keydownaurguments, m as mousedownaurguments) handles keydown, mousedown
'\\ code
end sub
[Code].....
I am auto generating data grid and I am using check box in Data grid View,Now i am invoking check box state changed event but it produces the following error Handles clause requires a With Events variable defined in the containing type or one of its base types.
Here the code
Private Sub PRNT_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PRNT.CheckedChanged
Some Stuff.
End Sub
Noticed that in my MDI Application, all my child forms lose the transparency of the border that Aero provides. Is there a way to "force" them to inherit the styling or is there a property i've overlooked to allow this?
View 2 RepliesIf I want to make a sub that triggers when button A or B are pressed, the sub will look like the following:
Private Sub btnA_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnA.Click, btnB.Click
While this isn't a problem when a couple of buttons are concerned, it becomes quite a chore when you have to type the names of 35 buttons to add to a single sub. Is there a faster way of doing it, perhaps by selecting multiple names/controls somehow?
I have setup some base forms with some bottons on it The buttons are situated in a panel.Both the panel and the buttons modifer properties have been set up as "Friend".The problem I have is when I inherit these base forms, the buttons seem to jump around by themselves allot
View 6 RepliesWhen I create an inherited form, after creation for some reason I cant see the form to edit in designer, I mean I cant drag and drop buttons, labels or any control to it since I just CANT see it, I have included a pic of what I see below where Form1 is the Inherited Form. What Am I doing wrong or what is happening
View 6 RepliesI have a form in VB with many (over 100 - fields, labels, the form itself etc...) items on. I wondered if there was a way of refering to all the items on the form without having to list them all individually in the Handles keyword, which is extremely long winded! I want to carry out the same action wherever the user clicks on the form. At present I have the following
[Code]...
How would i go about making a form that handles a different forms settings?ei, the Button Forecolours ect.
View 5 RepliesI have a form called BaseReportForm that handles drawing some stuff to in a panel to create a template for a bunch of reports. The drawing all takes place in the Panel's Paint event and this form will always be inherited. In the inherited forms, I draw the specific details of the report in the inherited form's Panel Paint event. So I am drawing to the same panel from the base form and from the inherited form. It all works fine, but when I try to open the design view for the inherited forms, I get the following error..
Quote:
The event Paint is read-only and cannot be changed.
I'm not sure I am handling my paint events correctly. Is there a different way I should be handling the drawing of these reports?
I have googled high and low to find an answer to this but I must be searching wrong.I have an application which has a listview displaying some items that are stored in a SQL Compact database. I am using a second form to add new items to this list directly into the database.When the second form closes I want to call the sub in my first form to refresh the list from the database.
How can I get it to fire the form1 sub routine on the close event of form2
I have two forms in an application. One is he background and then I show another keypad form called with the show() method (not showDialog) because I need to perform some validations on btn click.
The kepad has 10 buttons and an Enter Button. The problem is that the form keeps loosing focus (I checked this with a messagebox which keeps poping up once for focus=true and again for focus=false, it continuously keeps losing and gaining focus) so it does not process any keypress events untill i click somewhere on the form. I tried using me.focus() in form load event but to no avail. The forms TopMost property is also set to true.
I am bringing back here the subject of the communication between forms. The reason for this is that in a recent discussion in this forum it was conclude that using the events for communication between forms was a good practice. In a first time, I want to say, and everybody should agree with this that no form should never access directly any value or control values that belong to another form. There are many reasons for this but the principal one can be seen in this example
IN FORM1:
TextBox1.Text="CrazyPennie"
Dim MyNane as string = Textbox1.text
With this code, Form1 will expect "MyName" to have the value "CrazyPennie".
But, if Form2 does access the directly the controls of Form1, it is possible for the value of MyName to be set to something else since Form2 can have changed the value of TextBox1.Text before the assignment by Form1 to MyName. Now, what is wrong about using the events for the communication? The problem is that an event is broadcasted throughout the entire application, so the conversations in between two forms are not private.
Look at this scenario:
You have 3 forms in an application that communicate with each other with events. It is then possible for Form3 to listen to a communication between Form1 and Form2. It is also possible for Form3 to make the error to believe that the message send by Form1 to Form2 was address to itself. In this case, Form3, following this message may take some action that should not have been done and that result in some undesirable repercussion throughout the application.
This code keep the communication in between 2 forms private so no other forms or class in the application can listen at it and accidentally take an undesirable action due to a mistake.
Option Strict On
Public Class Form1
Delegate Sub MessageDelegate(ByVal sender As Object, ByVal Message As String)
Dim Form2 As New Frm2
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
[Code] .....
I have a form set up that allows the user to do many things to manipulate items. One of the things they can do is replace an item with another. To do so, what I have them do is click the Replace button on the main form. This calls the show of a choose replacement form where there is a grid view containing the replacement options and a Replace and Cancel button. When the user selects a product from the grid, and clicks the replace button, I want the item's ID to be sent back to the main form to be used in the replacement sub.This is what I have:
Main form:
Form Load:
AddHandler replaceComponentForm.Replace, AddressOf Me.Replace
ReplaceButton.Click[code].....
The problem is the events don't seem to be reaching the main form. The replacement form closes, but Replace does not get called in the main form.
I have a tabbed webbrowser I want to add an event to it to make it so IE doesn't pop up when I click a link, with a normal webrowser that is easy but I guess I have to do a handler with the tabs being part of the browser and all. I have little experience with handlers. [Code]
View 4 RepliesI declared a browser in my VB.NET project (Dim browse as new WebBrowser). How am I supposed to get to the events (browse_NewWindow) of the declared thing?Oh yeah, my code for my browser is CType(TabControl1.SelectedTab.WebBrowser(1))
View 4 RepliesHow can i code my application so that it can handle two sets of key events at the same time? For example, if I was making a game where one player used the WASD, and the other the arrow keys for moving, how can i make it so that both can move at the same time? The code I used only allows one to move at a time.. (key press event, If e.KeyData = Windows.Forms.Keys.down then.... etc)
View 1 Repliesi'm making a astoroids clone and i use pointF to store units position, but they lost y value on events like form.losefocus(i think)Is there any ways to prevent this?
View 1 RepliesI have 3 classes in 3 separate dll.
1) Class "BaseForm" that inherits from System.Windows.Forms.Form with "MyEvent" declared as Public Event ()
2) Class "MyForm" which inherits from "BaseForm"
3) class "MyClass" which has a public property "ExternalObject" of "BaseForm" type (the private variable is declared WithEvents)
I make the following steps:
1) intercept the Form LOAD event in "BaseForm"
- Instance the class "MyClass", Assign public property "ExternalObject" = Me
- I do a RaiseEvent "MyEvent" in "BaseForm"
2) "MyEvent" is triggered BEFORE in "MyForm"
3) AFTER "MyEvent" is triggered in "MyClass".How Can I Raise event Befor in "MyClass" and then in "MyForm"?
I have a form with 2 contols that I with to connect by drawing a "wire" on the screen. It goes like this: you mouse down on the first control then move the mouse while holding the mouse button down. When the mouse is over the 2nd control the mouse button is released and the controls are wired.
So I am playing with mouseup, down, move, etc. When the mouse is over the first control I get mouse moves from that control, but when it moves off the events stop, and I get no events from the form even though the mouse is there.
Is there a way to do this? I have seen it done in a Java app. I could brute force it and just draw a box on the form instead of a control, but that sounds like a step back.
I have form 1 which will raise an event for form2 after doing some calculations. I know how to raise an event in form2 and then write the sub in form1 but i cannot do the reverse... how can I do this in reverse??? I cannot raise the event sub in form2 is not responding.
Example:
Form1:
Code:
Public Class Form1
Event test()
RaiseEvent test()
[Code] .....
Is it possible to have multiple click events for a button based on the button text? In other words, if I change the button text can i create a new click event based on that text but use the same button?
for example:
button1.text starts as "steel"
button2.text starts as "brass"
If I click button1 then the text would change to:
button1.text="Stainless"
button2.text="Cold rolled"
If I click button1 again a string would then be added to a textbox and the process would start over again. can I have a different click event or would I need to put an If/Then or Select/Case in the sub to handle this? I have 10 buttons I would need to do this with and each needing at least 3 different choices for each depending on the previous button press.
I have two questions for anyone who can throw some idea's my way question 1:I am currently working on a control with three combo box's. This control will be nested on a form, and I want the on-board timer to track how long each control is active. I am trying to use the focus events of the combobox's to determine if the control is active so the program will know when the timer should be started and stopped. My problem is, for example, when the user causes the text property of the combo boxes to change, the folowing code runs:
[Code]...
As you can see, there are points in this sub-routine that can cause the focus to shift, as well as fire the text changed event. While this all happens faster than is really noticable, I would like to eliminate the extra cycles if at all possible. As I mentioned in question one, I am adding this control to a form, to be more clear I am adding multiple instances of this control to a single form, and I am trying to use the focus events to determine which of the controls within the form are active; however, when the form itself is no longer the active application, whether it is minimized, behind another application or otherwise, all of the timers stop. I want whichever control was active at the time that the form was deactivated, to continue as if nothing changed.
I am using an inherited form extensively for the first time, and I'd like to know if what I'm doing is correct.I have a base form with a grid and four buttons (Add, Edit, Remove and Close). There is no functionality in any of the button click events, as the specific implementation of each derived form will be different. The only exception perhaps is that the Close button closes the form. The only reason I am using a base form really is because I've many forms that look the same.How do I now expose the button click events to any derived forms? The only straightforward way I could think of was to have the button click events call an Overridable method, which I then override in the derived form:
Public Class frmTableBase
Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Me.AddButtonClicked()[code]...
Is that the correct way? It seems a little bit overkill to have to do this, although I can't think of another way really... Perhaps I could add the Overridable keyword to the event handlers themselves (and make them public)..?I'm doing it the way I showed now however. It works, but I'd just like to know if this is the generally accepted way of doing this.
I am creating a project with a maximized per-pixel alpha form. However, the normal input events (MouseDown, MouseWheel, KeyPress, etc) are never raised. I've been able to create some bare-bones functionality by overriding the WndProc method, but some things elude me. For example, I want to detect mouse wheel scrolling. When I check for the mouse wheel message, it works fine. Then I try to use the GetLParam function to get a MSLLMOUSESTRUCT with the scroll data. However, when I try to use it, I always get an error:"Attempted to read or write protected memory. This is often an indication that other memory is corrupt." What can I do?-Must Program! Error: Not enough time to program
View 1 RepliesMy application has 1 main form and three other forms which raise events to my main form. I noticed that the memory starts at 77,000 K and increases substationally over a few hours maby be to 250,000k and ever increases.The main form has a dataset and a bound datagridview which gets refreshed with data. Basically it's a taxi booking application. The booking form raises an event to the main form and the main form refreshes the jobs and displays them on the dgv.
View 8 RepliesWhich form events fire when a form is minimized, restored and maximized.I am trying to draw lines on a PictureBox control, but cannot get the draw subroutine to run after the form has been restored from a minimized windowstate.I probably should know this answer, but I have not written much code in the last 4-5 years and am relatively new to vb.netAlso.
View 6 Replies