Range of slider, minimum and maximum

Question

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Slider in mfc visual studio can have only 100 like maximum range or others value? Like 1500?
I wrote:

m_slider.SetRange(0, 1500);

but maximum range is always 100..

I know that maximum range is 100 because:

<pre>
void CDlgEntryPoint::OnNMCustomdrawSlider1(NMHDR *pNMHDR, LRESULT *pResult)
{
	LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);
	// TODO: Add your control notification handler code here

	int value = m_slider.GetPos();

	*pResult = 0;
}

and value is 100 when I have maximum range

What I have tried:

I tried to use code that I wrote above

Posted 28-Mar-23 3:59am

Member 14594285

Updated 28-Mar-23 11:02am

v2

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Comments

CHill60 28-Mar-23 10:15am

How did you create m_slider and what happens when to try to use the code that you wrote - be specific

Member 14594285 28-Mar-23 10:17am

I saw that range is always 100 and not 1500

Richard MacCutchan 28-Mar-23 10:43am

You can set the range to anything you like.

Richard MacCutchan 28-Mar-23 12:26pm

I have just tried the same with a non-MFC slider (which is the same underlying control) and it does what I expect. Your problem may have something to do with the fact that you are using a custom drawn control. But since we cannot see all your code that is a wild guess.

Shao Voon Wong 29-Mar-23 4:57am

You can print and view the m_slider.GetPos() output in the debug window or DebugView.

char buf[250];
sprintf_s(buf, "m_slider.GetPos() : %d\n", m_slider.GetPos());
OutputDebugStringA(buf);

[no name] 30-Mar-23 4:52am

Như đã được chỉ ra cho bạn, phương thức của CSliderCtrllớp cần gọi là SetRange. Nếu tôi là bạn, tôi sẽ tiếp cận vấn đề này theo hai giai đoạn. Trước tiên, hãy sử dụng điều khiển thanh trượt tiêu chuẩn, không phải do chủ sở hữu vẽ và đảm bảo bạn có thể đặt phạm vi cũng như nhận vị trí và giá trị của nó một cách chính xác. Bạn có thể muốn sử dụng bài viết cũ này mà tôi đã viết, Chỉnh sửa thông minh và điều khiển thanh trượt được liên kết [ ^ ] làm cơ sở thử nghiệm để thực hiện điều này. Sau khi bạn làm việc đó, thì tôi sẽ thay đổi nó thành chủ sở hữu được vẽ. Điều quan trọng ở đây là tách chức năng để bạn có thể xác minh một thứ không ảnh hưởng đến thứ kia.

2 solutions

Solution 1

Assuming you are using the MFC CSlider control, you can change the range: CSliderCtrl Class - SetRange method | Microsoft Learn[^]

Posted 28-Mar-23 4:48am

OriginalGriff

Comments

Member 14594285 28-Mar-23 10:57am

I use SetRange but I don't understand because range doesn't change, I put this function inside OnInitDialog

jeron1 28-Mar-23 11:14am

Have you tried setting the third parameter in SetRange() to true?

Richard MacCutchan 28-Mar-23 11:31am

How do you know it does not change?

Member 14594285 28-Mar-23 11:33am

because I put a breakpoint when position is 100, and I saw that 100 is the maximum range

Richard MacCutchan 28-Mar-23 11:46am

How did you see that 100 is the maximum range? As I stated above you can set the maximum range to any value up to 65535 as stated in the documentation.

Member 14594285 28-Mar-23 11:48am

I know but maximum range doesn't change

Richard MacCutchan 28-Mar-23 12:03pm

Well you still have not explained how you know. Have you used the SetRangeMax and GetRangeMax methods correctly? Quote:Please use the Improve question link above, and add complete details to your original question.

Member 14594285 28-Mar-23 12:06pm

I did

CHill60 28-Mar-23 12:08pm

Maximum range - or the value at that point in time? Try putting a breakpoint when the position is 120 - is that now the "maximum range"??? This does look to be "user error"

Member 14594285 28-Mar-23 12:14pm

if I write:
void CDlgEntryPoint::OnNMCustomdrawSlider1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMCUSTOMDRAW pNMCD = reinterpret_cast<lpnmcustomdraw>(pNMHDR);
// TODO: Add your control notification handler code here

int value = m_slider.GetPos();

if (value == 120)
{
int uuu = 6;
}
*pResult = 0;
}

and I put a breakpoint I can see that there isn't position 120

Member 14594285 28-Mar-23 11:32am

yes, it's the same thing

CHill60 28-Mar-23 12:08pm

What is the same thing? Value and Maximum Range are not the same thing

Member 14594285 28-Mar-23 12:10pm

I want to say that maximum range doesn't change, it's always 100

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Rick York · Accepted Answer · 2023-03-28T11:02:00

As has already been pointed out to you, the method of the CSliderCtrl class to call is SetRange. If I were you, I would approach this problem in two phases. First, use a standard slider control, not owner drawn, and make sure you can set its range and get its position and value correctly. You may want to use this old article I wrote, A smart edit and linked slider control[^] as a testbed to accomplish this. After you have that working, then I would change it to be owner drawn. The key thing here is to separate the functionality so that you can verify one thing is not affecting the other.