Invert image with ofxToggle doesn't work

@FreddyGump wrote:

I’m trying to create a GUI that holds some basic image “filters”

I load an image from my system and then store it in an vector from the example fileOpenSaveDialogExample. After this I want to invert that image when the toggle is “true”.

Currently it’s not working properly, because I have the invert code in “on mouse click”. When I then press the toggle click on the actual image afterwards, then it inverts. This is obviously one click too much as it should just invert when the toggle is clicked.
I have it this way because when I put the invert method in the draw() , it continuously flashes between the original image and the inverted version.

My code:

_ofApp.h_
//    Gui setup and main window
    ofxPanel gui;
    ofxToggle inverseSwitch;

ofApp.cpp

void ofApp::setup(){
    // for easy terminal output
    ofSetLogLevel(OF_LOG_VERBOSE);
    
//    Gui
    gui.setup();
    gui.add(inverseSwitch.setup("invert image", false));
    
}

void ofApp::draw(){
    ofBackground(255);
//    Loads image from file
    ofDrawBitmapString("Press spacebar to open an image, \"s\" to save the processed output", 20, 15);
    
//    Invert Example for Main Window
    for (int i=0; i<loadedImages.size(); i++){
        loadedImages[i].draw(0,20);
    }
    
//    Drawing the gui
    gui.draw();
}

void ofApp::mousePressed(int x, int y, int button){
    
    if(inverseSwitch){
        for (int i=0; i<loadedImages.size(); i++){
            //        loadedImages[i].setColor(0, 20, color);
            loadedImages[i] = invertImage(loadedImages[i]);
            loadedImages[i].draw(0,20);
        }
    }

}

ofImage ofApp::invertImage(ofImage img){
    Mat temp;
    temp = toCv(img);
    for(int i = 0; i < ((temp.cols)*(temp.rows))*3; i++){
        temp.data[i] = 255 - temp.data[i];
    }
    toOf(temp, img);
    img.update();
    return img;
}

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