C++ dialog boxes

almostEric · August 25, 2020, 3:15pm

I am so sadly weak at making C++ interact with the world outside of VCV. I need to create a dialog box to allow the user to enter a number for a set and forget type parameter (it would not be good to just have a knob for this).

Is there an easy OS-independent way of doing this? Just asking before I dive into Rack’s code since it is done there

stoermelder · August 25, 2020, 3:17pm

A textbox on the context menu won’t work?

almostEric · August 25, 2020, 3:18pm

?? well, I plan on opening said dialog box from context menu?

stoermelder · August 25, 2020, 3:21pm

I mean enter the number right in a textbox on the context menu of the module, like the context menu of a parameter where you can enter a value.

almostEric · August 25, 2020, 3:22pm

wow, that would be even better! Is there an example I can find of this?

stoermelder · August 25, 2020, 3:25pm

This is how it’s done for ParamWidget:

github.com

VCVRack/Rack/blob/2db08f15a00f6792bb3a45db31dd13f94966beed/src/app/ParamWidget.cpp#L201


	}
}

void ParamWidget::createContextMenu() {
	ui::Menu* menu = createMenu();

	ParamLabel* paramLabel = new ParamLabel;
	paramLabel->paramWidget = this;
	menu->addChild(paramLabel);

	ParamField* paramField = new ParamField;
	paramField->box.size.x = 100;
	paramField->setParamWidget(this);
	menu->addChild(paramField);

	ParamResetItem* resetItem = new ParamResetItem;
	resetItem->text = "Initialize";
	resetItem->rightText = "Double-click";
	resetItem->paramWidget = this;
	menu->addChild(resetItem);

almostEric · August 25, 2020, 3:41pm

thank you so much!!!

almostEric · August 25, 2020, 3:50pm

before I dive too deep, does this work ok on the main context menu? This is a global parameter

stoermelder · August 25, 2020, 3:55pm

You mean on the context menu of the module? Then yes.

almostEric · August 25, 2020, 3:56pm

actually, I am going to take a quick look at your intermix module - the way you set up “display brightness” would be perfect

Vortico · August 25, 2020, 7:31pm

You have two options: Open a native OS dialog box, or open a menu with Rack containing a text field.

osdialog doesn’t support “prompt” style dialogs yet (similar to JavaScript’s prompt()). That project is open-source and I am accepting feature requests to the project, and possibly PRs after the task is discussed.
You can open a menu with createMenu() and put a TextField subclass in it. Override the onSelectKey() method to call the superclass’s method and then respond to the Enter key to accept the user input.