DrawImage Issues In A Dynamically Added Picturebox?
Feb 5, 2009
This is my first post to these forums so forgive me for any etiquette I may be disregarding.I am creating a custom control that has a TabControl on it. The user will then double click or right click the TabControl to display a ContextMenuStrip asking if they would like to add a new image (or tab) to the project. After they select the image file, I create a new tab, add that to the TabControl, and then I want to create a PictureBox that I draw on in a particular way depending on space available and several other factors.
Where I am having the issue is in drawing the image to the PictureBox, it is only displaying the BackColor and none of the DrawImage work. It is important to note that because of what I am doing it will not suffice to set the PicBox.Image = ImageFile or PicBox.BackgroundImage = ImageFile. I need to select tiles from the image file and then draw them into the PictureBox in a particular way, which changes if the control resizes. Also, I am using a PictureBox because the final image within it can potentially be larger than the containing tab page, and therefore I want the TabPage to generate an AutoScroll bar. If there is another way to do this, please let me know.
Below is a very simple example of what I have currently. What I suspect to be happening is that the PictureBox's Paint event is firing after I do my DrawImage work and basically overriding what I did, but I hope I am wrong.OpenAddTilesetForm() simply displays a form for the user to select which image to use, and the properties pertaining to it.
[Code]...
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Dec 16, 2010
How can I get the xml in to a dynamicly created picturebox as a name
Dim SongXmlElement = <PlayList>
<%= From item In El_Song.Elements Select item %>
</PlayList>
[Code]...
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Jan 19, 2011
how to add dynamic control to dynamically added picturebox?
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Dec 2, 2009
I've dynamically added 20 pictureboxes to a panel and would like to see the panel scroll when I use the mouse wheel. To implement this I have tried to set the autoscroll to true on the panel control. Here is the code.
For i As Integer = 1 To 20:
Dim b As New PictureBox()
b.Image = Nothing
[Code]....
It works for "button" control, but not for the "picturebox" or "label" controls?
How can I implementthe scrolling affect using 'mousewheel'?
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May 15, 2011
I've a program that draw an image in a picturebox with DrawImage. This image, a ball (.png transparent), every second is overwritten by another ball of different color. After 3-5 second the edge of the ball becomes bad, because of overwriting.
I tried to clean the background with a FillRectangle before any overwrite, but i need to preserve the windows form background. How can i do that?
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Nov 15, 2010
In the following code is the way to make a picture transparent (picture i1 is emty and opacity can get values from 0.00 to 1.00[code]...
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Apr 17, 2010
I have tried to realign the image by down and right one pixel, but still only part of the first row and column are visible when zoomed.I can't find exactly what I'm looking for online.
My computer is an HP-Pavillion dv9600 Notebook PC.
OS: Windows Vista SP2 32-bit
The following code reproduces the problem:
Public Class PictureBug
Dim pxlColor As Color
Dim img As Bitmap = New System.Drawing.Bitmap(My.Resources.TestBug[code]......
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Jan 27, 2010
when adding picture to dynamic picturebox from my.resources in .dll a duplicate semi functional picturebox is added too, behind the picturebox i intended to add. has anyone seen this happening before or can provide any insight into this?
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Sep 27, 2009
I have a program I'm working on that, for one of the features, allows the user to drag an image from a picturebox, into the main form space, anywhere they want. [code]...
When trying to drag the image from the CurrentTilePicBox, the very moment I move the mouse while dragging the cursor becomes a circle with a cross and won't drag and drop into the new picturebox.
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Jan 15, 2010
I understand the page lifecycle and how i need to add the dynamic controls on page_init if I want to take advantage of viewstate. Also I know that I should try to avoid dynamic controls when possible. The dynamic controls are created depending on an object that is created from custom event arguments sent from a custom treeview. Problem is I need viewstate so I need to create them in page_init but I don't have the event args to create the object that tell me what controls to add until later in the lifecycle.
Private Function GetEventArgs() As npTreeViewEventArgs
Dim control As Control = Nothing
Dim e As npTreeViewEventArgs = Nothing
[code]....
I use this in page_init to create my object and controls.
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Nov 15, 2010
I know when I draw to the form and add controls I get a flicker effect.If I draw to a picturebox on the form and add controls will the picturebox flicker?
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Jan 7, 2010
I am working a small project where I would like the user to be able to add images to a form, specifying a URL in the tag of pictureBox, so that when it is clicked.
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May 13, 2011
Okay, so I have some problems with dynamically added pictureboxes. This is the code I have now. When I click on one of the imageboxes, I get teh following error: Index was outside the bounds of the array.
[Code]...
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Jun 13, 2011
I've created a new tabpage and also added a richtextbox to it:
Private Sub AddTab(ByVal ctrl As TabControl, _
ByVal text As String)
If Me.InvokeRequired Then
[Code].....
I know the name is rigth cause I have printed the name in the create method and I have printed the name string in the code where I try to access it.
So by the looks of it it seems .Item() is not the right way to access the control.
So how to access to dynamically created control?
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Sep 19, 2011
On my webpage I am loading multiple instances of a usercontrol, sometimes the usercontrol is laoded within itself. I need to save a bunch of properties for the round trip of a post back but i am confused on how to save those properties to ViewState and set them again to the repeater items within the usercontrol. have read the MSDN on Viewstate but I am not understanding it quite well for some reason..[code]
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May 22, 2011
I need to be able to add buttons in my application dynamically, and I have written this
Dim bttn As New System.Windows.Forms.Button()
bttn.Text = "This is a new button"
bttn.Left = 326
[code].....
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Apr 14, 2009
I m creating a multi tab application. i m adding tab & RichTextBox in tab control through programming. i want to access the text of rich text box.
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Jun 22, 2009
I have a number of user control dynamically added to a page, and user interaction with these dynamically added user controls need to be handled by the control's parent. Is this what is referred to as "event bubbling"?How do I do that in VB?
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Nov 19, 2010
I'm adding multiple combobox controls to a form dynamically, but am having a problem with one of the event handlers. The first event handler I've added (for the Leave event) fires, but the second (for the TextChanged event) does not. I've tried reversing the order when adding the handlers and I get the same results (TextChanged does not fire). Here's a code snippet for adding the controls, and the code for the events. I've added a breakpoint while testing to verify - but it never hits the code.
Dim cbo As New ComboBox
cbo.Name = "cbo" & fldName
cbo.Tag = fldName.ToUpper
cbo.Top = rowtop
cbo.TabIndex = tabOrder
cbo.DropDownStyle = ComboBoxStyle.DropDown
[Code] .....
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Dec 9, 2009
how can I get the checkboxcell value for each row on the click of a button?
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Sep 15, 2011
I am trying to create a program, where the user click a button and this will add a custom control and then drag and drop them on the form.
What I want to be able to do is add multiple controls (by clicking this button) and for them all to have the same events. So basically they can add as many as they like of this control and then click on it and drag it anywhere.I know in vb6 there was the use of the control index but I am not sure how to do this in Visual Studio 2005?
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Jan 24, 2011
I am working a small project where I would like the user to be able to add images to a form, specifying a URL in the tag of pictureBox, so that when it is clicked. They are taken to the website they specified when adding the pictureBox.
I have a separate form for adding the URL and image so I need to pass those variables into the first form.
how to access the Tag property of the individual pictureBox when the user clicks it. Here is my pictureBox creation code which is in the second form:
Dim tool As String
Dim ptext As String
Dim url As String
[Code].....
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May 26, 2011
I'm creating an online exam page with 30 radiobuttons that are created dynamically at runtime. How will I get the click event of each radiobutton and tag it in my method that I will check if the next question is need to be jump or escape. Example: If I'm in question 10 and answer = "Yes", redirect me to Question 15, else go to the next question
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Feb 8, 2011
I have created a User Control in VB 2005 that adds other controls dynamically. This is a fairly simple test project, with checkboxes added to the control at run-time. Here's the user control:
Public
Class UserControl1
Public x
[Code]......
Then I built the test control and tried to added it to the Toolbox. When I did this--i.e., browsed to the dll and double-clicked it, I got the errror message:
"There are no components in ... that can be placed in the toolbox."
Is it even possible to add a User Control to the Toolbox without compile-time components?
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Feb 21, 2011
When the user selects an "account" we dynamically create a linkbutton with the selected dates. However, the linkbutton onclick handler doesn't fire when the button is clicked.
Dim linkBtn As New LinkButton
linkBtn.Text = "----"
AddHandler linkBtn.Click, AddressOf linkButtonHandler
linkBtn.ID = panelDatesRencontre.Controls.OfType(Of LinkButton).Count
panelDatesRencontre.Controls.Add(linkBtn)
[Code] .....
I make that in page_load, it seems to work.
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Jan 12, 2011
I get values from web service:
Dim ctr As Integer = 100
Dim ctr2 As Integer = 145
Dim ctr3 As Integer = -2
[code].....
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Jan 12, 2011
I created 5 textboxes using runtime controls:
For i As Integer = 0 To 4
Dim custom As New TextBox
custom.Name = "Custom" & i
[Code]....
how can I get those values and then pass it to a web service? (This should happen when i click the submit button)
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Mar 5, 2012
I am adding controls to a page programatically in the code behind. I add an asp:Label and set it's Text value. I add an asp:TextBox and set it's Text value. Both Text values are returned in the Response and displayed in the browser. All fine so far.
The user performs an action that causes a postback. I re-load the dynamically added asp:Label and asp:TextBox. When the Response is returned to the browser, only the asp:TextBox Text value is displayed. The asp:Label Text value is not. If I inspect the HTML I can see the asp:Label control (rendered as an HTML span tag) but no value.
How can I get the code to automatically re-load the Text value of an asp:Label on each postback? Why is the behaviour different for an asp:Label and an asp:TextBox? I do not want to have to manually re-set the Text value on each postback.
Here is some code similar to what I am doing (placeHolderNameplates is an asp:PlaceHolder control on the aspx page): Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
If Not Page.IsPostBack Then
[Code]...
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Dec 27, 2009
I have successfully added textboxes to a form at runtime. I have also succesfully added an event handler to these same textboxes. What I'm having trouble understanding is how to refer to these textboxes programmatically after they have been added. Specifically, how do I;
1) Retrieve user data entered in those textboxes without an event handler
2) Find a specific one of those textboxex later (is looping thru all controls of type "textbox" the only way)?
purpose of find is so that I can set the value of the corresponding textbox programatically, based on some criteria Here is the code (all within in a for loop, where intvararycount is incrementing to a set limit) I have used to add the Textboxes to a Panel on a Form;
[Code]...
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Dec 16, 2011
I am writing the following code on the rowdatabound of the grid view and i am not getting the click event of link button..[code]
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