Custom Control OnPaint Causes VS Crash On Resizing?
Apr 2, 2012
Custom control, based on ProgressBar, in design mode, resizing to larger casues VS to crash, resizing to smaller is fine. The error from the MsgBox is Parameter not valid. The line that is reported at fault is 'rRect(i) = New RectangleF(rPoints(i), rSize)'.The function below is called indirectly from 'Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)'
Private Function GetRoundPath(ByVal r As RectangleF) As GraphicsPath
Dim rPath As New GraphicsPath
Dim rPoints(4) As PointF[code]......
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Nov 3, 2011
I'm developing custom .net themes, and this relies on GDI+ -- I've been able to do this mainly with a ThemeBase released on another website. Now, however, whilst inheriting another control, I am Unable to inherit the ThemeBase which means I have to design the control a little differently -- which relies on me being able to manipulate the 'OnPaint' event of the control's design.The control's 'OnPaint' event is never fired, and I don't know why. Here's the entire textbox code.[code]
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Jun 11, 2009
I have created a custom control that is included in a control library that is referenced by a VB Forms application.
When I modify the control, and have the application open in a VS window, VS usually asks me if I want to reload items that have changed.
However, a couple of times, it has not asked me this, and when I go to open the form that contains the modified control, I get an error window warning me that if I ignore the error message and continue, then I risk making VS unstable. I've learned to ignore this error message, continue, and immediately save the form to a new file.
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Nov 25, 2010
i'm attempting to develop a calendar using datagridview where column headers are dates and row headers are list of employees.
i would like to add a button/custom control on the datagridview to represent a task over time where I can move or resize at runtime.
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Sep 2, 2010
I have a Custom Groupbox that overrides the OnPaint event to do some custom drawing, backgrounds, etc. The problem I have is that when I use it in an application and want to draw text on the control, it gets drawn first, then immediately afterwards the OnPaint from the control gets called and draws on top of the text. Is there any way to get the text drawn after the control's OnPaint?
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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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May 14, 2011
ok so im making a custom windows border. ive got it all layed out and it is working greatbut im trying to make it so that the image in the bottom left corner will be click and thenheld and when the mouse move the
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Sep 3, 2011
I've been programming a Fisheye-panel that holds image and make it behave like the icondock in Mac Os X. But now i have a problem. When i add to many item, i want them to shirk, to make room for more, or grow when i remove icons. This is the behavior i get: When i want them to grow, they don't grow at all. When i want them to shrink, they shrink, but leaves lots of empty space (like replacing a photo from a frame with a smaller photo. The image shrink, but not the frame)
[Code]...
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Sep 11, 2011
My full screen sized Form is locked in size when I reduce it in size by clicking on the "restore down" [ie] not to the minimized size. I mean "locked in size" by I cannot for instance "grab" it on a corner and to increase or decrease its size. I suspect the control is in the properties window but I cannot find it.
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Nov 28, 2009
I need a 3d loader (I do not care if it is 3ds,collada or sth else), because I search and I find only c code for opengl until now. Has anybody done this?
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May 12, 2009
I have drawn out a datagridview onto my form at a certain size.But, say I have 3 rows of data and they dont fill the grid to its bottom. So I'm left with a bunch of empty grey color stuff in the rest of the control below.Is there any simple property/method that will fit the control size to just the rows loaded, or am I being too picky?
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Apr 18, 2011
[code]i want to extend the window width everytime i expand the expander control to the right.when i run the above quoted xaml and expand the expander control after the build, everything works like expected, but as soon as i manually resize the window, the content of the expander control will expand into the existing area to the left. how can i change this behaviour, so that the window will extend its width to the right side and the content will end up in that new area?
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Nov 3, 2009
I have two controls (for example the dockable toolbars) on my main form. Now one to the Left L1, and other to the right R1 now when I resize these controls during run time, slowly by a timer , L1 goes pleasantly.(Because size reduction happens from right to left on a control).
On R1, the problem is different, since it is docked right, every time it is resized, it starts flickering...
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Nov 12, 2009
First off I'm using the Extended Webbrowser control from: [URL]
I use the Webbrowser control to access an ESRI web based mapping solution. When the ESRI map is loaded into an IE browser and the browser is resized then the map control resizing accordingly. When my Webbrowser control is resized the map webpage is not resizing properly.
I don't even know where to start with this problem. Is there some event that's not firing in the website? I can't simply refresh the whole website because the user may have panned and zoomed around. I want to just tell the website that the container control (Webbrowser control) is resizing now.
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Dec 29, 2011
how to specify a custom icon for display in the toolbox window when you create your own custom control? Something other than the dreaded "gearbox" icon.
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Jan 26, 2010
I have seen code that uses the event:MyControl_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
and others the used: Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
Is there an advantage to using one over the other?
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Jan 18, 2011
Does anyone know what causes and more importantly how to prevent the flickering you come by when painting a control?
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Jul 11, 2011
I have an ASPX Custom Control which is supposed to load it's properties into an internal collection (defined with PersistenceMode.InnerProperty). Here's the ASPX
<cc:CustomControl runat="server">
<Queries>
<cc:QueryTypeOne ... />
[code]...
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Aug 13, 2010
I'm trying to write some toast-style popup notifications (similar to Growl) which should appear next to the system tray and stack as appropriate.I can handle the instantiation/location/etc... but I want to add a capability for non-rectangular toasts. I'd also like to have Alpha transparency so a semi-transparent background PNG on the toast form would blend with the desktop or windows behind it.
So... To get the obvious out of the way: Form.TransparencyKey is not sufficient for my needs as it's an all-or nothing transparency effect I want to get 50/50 foreground/background in some places, 0/100 in others, 100/0 in yet others etc.My initial approach is to override the OnBackgroundPaint() method, comment out the call to MyBase.OnBackgroundPaint and use the graphics object in the eventargs to draw exactly what I want to a form.This seems to work to start with - at the moment, I'm just drawing some rectangle for testing purposes so a PNG may present new difficulties but I haven't got there yet.
What I haven't been able to accomplish is updating the graphic - The first time the form is rendered, it shows perfectly as I'd expect (no border, just some rectangles floating on a desktop). If I move the windows behind the transparent window, the transparent window doesn't update/re-paintI believe that I need to be calling Me.Invalidate() to force a re-draw but am unsure when I should make the call - How do I know a window behind me has changed its' contents?
Edit: I tried putting a Me.Invalidate() inside a timer just to test how the redraw happens - it seems that it does trigger a re-draw but the re-draw opccurs OVER the existing form background - ie an area that was originally 50% opaque is now 75% opaque (50% + 50% of what was there before)So, after a couple of Invalidate()s, my form is showing as a black box - I need to clear the background of the form before re-drawing but Graphics.Clear(Color) seems to simply do a fill with the specified color - and obviously for the purposes of this question, Colors.Transparent doesn't really mean transparent - It seems to be a trick used when rendering the window to "show contents of control beneath this" which just doesn't work when we're dealing with the form itself?
Imports System.Drawing
Public Class TransparentForm
Private Timer As Timers.Timer
[code]....
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Jan 11, 2010
I am using custom textboxes and I need to be able to set the Text on txb1 based on the Text of txb2. I have simplied my code to the following:
Public Class customtextbox
Inherits TextBox
Public Event ControlReset()
[Code]....
So, when txb1 looses focus, if its Text is "fried", then it sets off txb2's ProcessAlert function. I had tried to change the value of txb2 Text in ProcessAlert function, but didnt work, so I tried to get it to raise an event instead, which then tries to set the Text property. However I still cant set txb2's Text property. The Text property seems to be set for the duration of the "life" of the Event handler. When I step through the forms controls within the Event handler, the changed Text value is there, but not outside of the Event handler.
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May 15, 2012
I am working on a simple NES gaming reprogramming project (who doesn't try to program video games when they start out?) and am coming up with a goofy little error in my battle screen code. The Battle Screen is supposed to trigger and draw this form, but the thing redraws itself three or four times, creating an obvious and obnoxious triple-blink. Basically, the OnPaint event is still a bit of a mystery to me. Is there a way to reduce the amount of redraws so that it doesn't blink like it does?
Public Class Form1
Dim provider, dataFile, connString As String
Dim enemyTop, enemyLeft, enemyWidth, enemyHeight As Integer
[CODE]...
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Jul 29, 2009
I've created my own ascx control with button inside it. Now I'm using this control inside other control. (In my case it is a webpart). What I would like to do is program button.click logic from my custom control inside webpart
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Jul 17, 2011
Can a custom control NEW Sub be the only one that executes when Inheriting from an existing control please?I am Inheriting from TabControl and I do not want the base New Sub called, is this possible?In other words, I do not want TabPage1 and TabPage2 to be added.A Form has an Activated Sub which runs once a Form is activated.It is a pity that Microsoft have not got such a method in the baseControl Class otherwise I could have used it within a custom TabControl.
Public Class Form1
Private Sub Form1_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated
End Sub
[code]....
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Apr 29, 2010
We have a ASP.NET web application written in VB.NET where we build content programmatically during the Init event.We make extensive use of user controls, building them on the fly, and I now want to start including SilverLight content.Is there an easy way of embedding a SilverLight application in a control, and then instantiating the whole thing in code, in the same way as you'd programmatically add ordinary ASP.NET controls to a page?The SilverLight component itself works fine when added to a page using the <object> tag but I really want to be able to reuse it elsewhere in code.Since I'm expecting use of SilverLight to increase in our application, and the asp:Silverlight control seems now to be deprecated, I'm looking for an alternative way of wrapping the content.
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Jul 28, 2009
I've got a set of controls in a line inside"FollowTableLayoutPanel1", contained within "TableLayoutPanel2".I have them resizing according to the position of the mouse cursor; the closer the mouse cursor is to the vertical centre of the control, the larger the control is. Because FollowTableLayoutPanel1 has its anchor property set to "Top", it recentres itself in TableLayoutPanel2.It is possible for the recentring of FollowTableLayoutPanel1 to move a control one pixel further away from the mouse pointer, which causes the control to shrink, which causes FollowTableLayoutPanel1 to recentre, placing the control closer to the mouse pointer, which causes the control to grow,which causes FollowTableLayoutPanel1 to recentre, which moves the control further away from the mouse cursor, etc., etc., etc.The end result is that the whole setup judders and wobbles, constantly resizing.Full example code is provided below,and can be pasted directly into Form1 of a new project. Positioning the mouse cursor to correctly show the problem is left as an exercise for the reader :
Public Class Form1
Private Sub myInitializeComponent()
Me.components = New System.ComponentModel.Container
Me.TableLayoutPanel2 = New System.Windows.Forms.TableLayoutPanel[code].....
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Nov 25, 2009
What I've done is create a User Control Library (Project) and I've added a single User Control to that project. The control contains a single FlowLayoutPanel, and I created a Property on the control itself to pass the FlowDirection from the Control to its FlowLayoutPanel child.
Build, reference, component appears in the Toolbox and everything works fine, but the property on the control does not appear in the Properties window when I go to edit it at design time.
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Jan 9, 2012
I want to understand N-tier architecture like when to use and so on.Also I would like to know about user control and custom control.
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Sep 2, 2011
I am trying to make a listview custom control based on the standard listview control that will allow me to drag a column header outside the standard listview control and drop it on a panel. I plan to use the drop event to determine which column I should group by view on.
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Jul 4, 2010
[URL]I tried dragging it but it didn't work. I'm not used to the IDE. Also, how would I make that control at runtime and place it on the form I understand you would do
PHP Code:
Dim myAccount as new TAccount
But how do I display it on the form?
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Apr 2, 2010
I want to create a custom control in a dll file.
I can make this without a dll file, also inside a normal project, making a class for it and inheriting the desired base control class, compiling the project and the toolbox has the custom control.
But now I want to make it in a separate file, in a dll file. I use vb express 2008.
I start a new class library project, add the reference System.Windows.Forms to the project and add this code (this is only an example):
Inherits System.Windows.Forms.Button
Private Sub New()
Me.Backcolor=Color.Red
End Sub
I compile the project and get the dll file. Then I add this file to the toolbox, but I get the error message: "this control has no components."
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