Clicks not registered

[adcox]

Compiled and ran example-demo on OS X 10.11.5 Mid-2015 Macbook Pro. The trackpad on these laptops has two click "types": one is triggered with a light tap, the other is triggered by a more forceful push. The second option always has the desired effect of clicking on the ImGui element. The first option, however, does not. Often the click is not registered by ImGui and the button isn't pressed or the menu item doesn't expand.

I added a logger line to the mouse press event in the ofApp::mousePressed function and it catches every single mouse press. I also tested the vanilla ImGui examples (https://github.com/ocornut/imgui) and they work perfectly.

This leads me to believe that there is some synchronization issue between the OF window detecting the mouse event and that event being passed down to the BaseEngine and other classes. A more forceful click lasts longer, so perhaps it is picked up over multiple frames and transmitted properly.

[jvcleave]

can you see if it makes it here?

https://github.com/jvcleave/ofxImGui/blob/b9929bb6ffef97eb9535c5a1c9778bee31517eab/src/EngineGLFW.cpp#L104

[adcox]

It does make it there; a print statement located just before the if() statement is hit twice for every mouse click, regardless of whether it is light, firm, and whether or not the gui makes the appropriate reaction.

[jvcleave]

So using this on my Macbook Pro (2012ish) with "Tap to Click" set in the preferences

void EngineGLFW::onMousePressed(ofMouseEventArgs& event)
{
    ofLogVerbose() << "EngineGLFW::onMousePressed: " << ofGetFrameNum();
    int button = event.button;
    if(button >= 0 && button < 5)
    {
        remapToGLFWConvention(button);
        ImGuiIO& io = ImGui::GetIO();
        io.MouseDown[button] = true;
    }
}

void EngineGLFW::onMouseReleased(ofMouseEventArgs& event)
{
    ofLogVerbose() << "EngineGLFW::onMouseReleased: " << ofGetFrameNum();

What appears to be happening is that the onMousePressed/onMouseReleased are called on the same frame with the "short clicks"

Setting ofSetVerticalSync(false); in ofApp seems to solve it or at least make it much harder

[jvcleave]

However I am not seeing a double hit on "EngineGLFW::onMousePressed:" like you are with your print statement

[adcox]

I implemented your logging and can confirm that the cases that don't work correspond to both MousePressed and MouseReleased being called in the same frame. The double hit was due to some code I was playing around with; I removed it and get only a single hit for each click now.

In my opinion, a more elegant solution is to implement some logic that queues the mouse events such that MousePressed and MouseReleased are called in successive frames rather than the same frame so that io.MouseDown[button] has time to be interpreted. I'm not sure if this is within the scope of your code; perhaps it is something I should implement at the App level? Placing the print statements in the ofApp.cpp event functions results in very similar results, although there are cases where both the Pressed() and Released() events occurred in the same from but the click was successfully registered.

Thanks for tracking that down!

[jvcleave]

yeah - I really am trying to stay out of implementing logic on behalf of the user. The addon's intention is really just to make it a bit easier to get ImGui working with OF (and on the platforms that OF supports).

I know that ImGui's examples run with vertical sync off and OF has it on by default. I guess if it were really bothering someone on a certain platform they could just extend BaseEngine for specific tweaks (or just modify the existing one)