InputScalar / Unchanged value

[SadE54]

Hi ,

I'm using ImGui::InputScalar for some value editing in a popup :

if (ImGui::InputScalar("", ImGuiDataType_U8, &value, NULL, NULL, "%u", ImGuiInputTextFlags_EnterReturnsTrue)
 {
...
}

and currently the condition is fulfilled when the value is changed AND Enter key is pressed.
Is it possible to validate only when Enter is pressed (an possible no value change so) ?
I looked in ImGuiInputTextFlags_ without finding a corresponding flag 🤔

[ocornut]

ImGui::InputScalar("")

Your identifier is very likely invalid. Please read the FAQ.

and currently the condition is fulfilled when the value is changed AND Enter key is pressed.
Is it possible to validate only when Enter is pressed (an possible no value change so) ?

This is discussed in #701 and currently not possible. We have a InputText refactor lined up soonish which might facilitate further improvements.

[SadE54]

Ok thanks

I tried to add a 'Cancel' button to allow closing popup in such a case , but I think I have the same problem than this one : #134

If I'm using ImGui::SetKeyboardFocusHere(); for my input field, to allow direct focus when opening the popup , I cannot press the 'Cancel' button to close the window 😆
I tried the fix mentioned without success :

if (ImGui::GetWindowIsFocused() && !ImGui::IsAnyItemActive()) 
    ImGui::SetKeyboardFocusHere();

[SadE54]

I was just playing with IsWindowAppearing when you answered , but without success . It looks like there's a timing problem, like if it was too soon to set up the focus when IsWindowAppearing() return true
If I set the focus with a button directly , it's working well. Here's the sample code:

static void ShowParameterEdit(bool* p_open)
{
    ImGui::OpenPopup("Info");
    if (ImGui::BeginPopup("Edit", ImGuiWindowFlags_AlwaysAutoResize))
    {
        ImGui::Text("Edit value");
        ImGui::Separator();

        bool focus = false;
		
	// Using the button , focus can be set correctly on input scalar
        if (ImGui::Button("Focus"))
        {
            focus = true;
        } 
		
	// The following block is called on when popup is opening, but focus is not set on input scalar
        if (ImGui::IsWindowAppearing())
        {
            focus = true;
        }

	    if (focus)
		{
			ImGui::SetKeyboardFocusHere();
		}
        
        float value = 0.0f;
        ImGui::InputScalar("##float_edit", ImGuiDataType_Float, &value, NULL, NULL, "%f", ImGuiInputTextFlags_EnterReturnsTrue);

		if (ImGui::Button("Cancel"))
        {
            ImGui::CloseCurrentPopup();
            *p_open = false;
        }

        ImGui::EndPopup();
	}
}

[ocornut]

There was a bug with SetKeyboardFocusHere() on clipped item fixed recently in 1.85 but we don't know what version number you are using.

[SadE54]

I'm using 1.84 , sorry .
I tested playing with a counter for each frame after IsWindowAppearing is triggered.
A correct focus is done the frame just after .

[ocornut]

If you update 1.85 this will be fixed.

[SadE54]

Many thanks for your time and help 👌If sometimes I can feel myself a little lost over all features, It's a real pleasure for me to work with such a tool , especially when you're used to cumbersome wpf 😁