[reSolved] Click on Forms Frame

Well, I'm clueless.

I'm using a sub to resize a panel when it's parent form resizes, via a MyBase.Resize handler

VB Code:

Private Sub RESIZE_FORM(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Resize

Within the sub, I'm also repositioning the panel so its centered in the form, and is always 9/10 ths the size of the form.

Within the panel is a picturebox, and that is being centered in the panel as the panel resizes to the forms new size.

Now, My next step is going to be, if the picturebox contains an image, the picturebox is going to resize as the panel resizes, and the image within the picturebox is going to resize to the size of the picturebox.

So:

Form Resizes-> Panel Resizes-> PictureBox Resizes-> Image Resizes

Now, certainly I can do all this from the MyBase.Resize event, however, I can see that resizeing the image is going to be a memory intensize operation, and the MyBase.resizing event is constantly firing as I'm using my mouse to change the forms frame size.

What I want to really do is when the frame is changing size, all the sub controls are changing size, but I want to hold off on resizing the image until the form STOPS resizing.

This would be doable without a timer, if I could detect the MouseUp event of the forms frame.

So, My Question is:

How can I get the forms frame to fire off mouse events?


:confused:
-Lou

Hi,

Depends on how you coded each control resize. Couldn't you use loops to continue until each control completes resizing?

Quote:

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Originally posted by taxes
Hi,

Depends on how you coded each control resize. Couldn't you use loops to continue until each control completes resizing?

---

I'm not worried about the controls resizing. They resize fine when I stretch the form.

I just want to reload a picture into the picturebox when the form STOPS resizing.

How do I detect when the form stops resizing?

Obviously, I know when it IS resizing, but how do I know when it has stopped?

With a timer, I can fire off a sub if the current interval from the last resize has exceeded a certain amount, say a half a second.

But, I'd rather know when the mousebutton has lifted off of the frame of the form.

Any Ideas on how to detect a Mouse_Up event in referance to a forms frame?

BTW, Clicking on a forms frame, or MouseDowning on it, does not set off the form's Mouse events.

However, the mouses Icon changes from a pointer to a double arrow when it is over the frame.

So, something is firing when a mouse is over the frame.

So it would seem that the frame's events should be as detectable as any control.

-Lou

Hi.

I'm not exactly sure HOW to do it, but I believe you could use the WndProc method of the form and check for WM_NCMBUTTONDOWN and WM_NCMBUTTONUP messages.

Something like this maybe...

VB Code:

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    If m.Msg = WM_NCMBUTTONDOWN Then
                  'User clicked the caption or one of the edges
                  'Block Imagesizing here
    ElseIf m.Msg = WM_NCMBUTTONUP Then
                  'User released the caption or one of the edges
                  'Perform resize here if size has changed
    End If
 
    MyBase.WndProc(m)
End Sub

I hope this is of any help...

Quote:

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Originally posted by pax
Hi.
...I hope this is of any help...

---

Hmm!
Sweet!

I tried your suggestion, but first I had to find the values for the constants you provided. Which led me to:

How to disable right click in textbox

So, trying your method, it intercepted the ButtonDown message, but NOT when I was going down on the frame, only the internal form.

So, I looked for Messages, hoping to find some more info, and found this subclassing thread:

Intercepting Print Screen

Didn't help much, but I tried it anyways, thinking I might intercept more. Didn't truly help, however it got me to thinking about Spy++

So, Activateing that tool up, I soon saw that mousedowning and mouseupping on the frame creates the messages:

WM_ENTERSIZEMOVE
WM_EXITSIZEMOVE

Which, after fidaddling a little, I figured out their values should be defined as:

VB Code:

Const WM_ENTERSIZEMOVE = &H231
    Const WM_EXITSIZEMOVE = &H232

Before I defined those constants, I spent some time looking for them to be defined in some sort of predefined system object, whereby I could see ALL the WM's. But I couldn't.

Also, During this, I found that:

VB Code:

If m.Msg = WM_RBUTTONDOWN Then
            MsgBox(m.ToString)
        End If

Spits this out:

Quote:

---

msg=0x204 (WM_RBUTTONDOWN) hwnd=0x6501a4 wparam=0x2 lparam=0x10d0196 result=0x0

---

It ACTUALLY contains the Text "WM_RBUTTONDOWN"!!!!

So, instead of checking the value of m.msg against a constant value, I could do an InStr on the message I'm checking for.

However, It'd be slower, and I really would only want to return the Text Alias of the message only, and not all of the hWnd, wParams, lParam, ...

But, I could not find that which returns ONLY the text alias of the message.

Oh, Well.

But, using the Constants WM_ENTERSIZEMOVE and WM_EXITSIZEMOVE is just what I want.

By this time, Knowing that the subclassing method achieved desired results, I went back and modified your code to the following:

VB Code:

Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        Select Case m.Msg
            Case WM_EXITSIZEMOVE
                Label1.Text = "OFF"
            Case WM_ENTERSIZEMOVE
                Label1.Text = "ON"
        End Select
        MyBase.WndProc(m)
    End Sub

And, having commented all the subclassing stuff out of my progie, saw these few lines of code does everything that I need.

{Well, I have to replace the label1.text setting with my image resizeing code, but you get the idea :) }

:thumb:

:wave:
-Thanks
-lou

Alrighty,

For anyone who wants to see, attached is my code which handles
resizing a loaded image in a picturebox after a form has been resized from dragging
its frame with a mouse.

When the Form resizes, a panel resizes in relation to the form, and a picturebox resizes in relation to the panel.

If the picturebox contains an image, if the form was resized by resizing the forms outside border with the mouse, then once the mouse releases the forms border, the picture inside the picture box resizes to the bounds of the picturebox.



:wave:
-Lou

Hi.

Glad you got it working.

But the WM_NCMBUTTONDOWN and WM_NCMBUTTONUP constants should respond to the frame as well.

The NC is the Non-Client area, so it should respond to all mousedown and up events in the non-client area of the window, including the caption.

Quote:

---

Originally posted by pax
...But the WM_NCMBUTTONDOWN...

---

OOPS!


I ended up mixing it up with WM_RBUTTONDOWN .

Ah Well. It's best that I ended up with WM_ENTERSIZEMOVE and WM_EXITSIZEMOVE, I wouldn't want to have to code around clicking on the title bar, or caption.





:wave:
-Lou