CODEWITHSUNDEEP
javalibgdxlabel
Mifelos
Mifelos

Reputation: 25

LibGDX updating a label while a mouse button is being clicked

I have a float value that is set from 0 to 100, and I want to register a long click and update a Label progressivly, so that like every 0.25seconds the label's text will be updated. For now I am using a custom made Label that has a method to update the text displayed.
I tried using touchDown like this:

while (Gdx.input.isButtonPressed(Buttons.LEFT)) {
    double currentValue = Double.parseDouble(Button.getText()
            .toString());
    if ((int) currentValue != 0)
        currentValue--;
    Button.updateText(Double.toString(currentValue));
}

but that doesn't seem to work, how do I update a label while a button is clicked?

Edit: Most of the code for the ClickListener:

        @Override
        public void enter(InputEvent event, float x, float y, int pointer,
                Actor fromActor) {
            super.enter(event, x, y, pointer, fromActor);
            TextButtonStyle style = ButtonLower.getStyle();
            style.font = red;
            ButtonLower.setStyle(style);
        }

        @Override
        public void exit(InputEvent event, float x, float y, int pointer,
                Actor toActor) {
            super.exit(event, x, y, pointer, toActor);
            TextButtonStyle style = ButtonLower.getStyle();
            style.font = white;
            ButtonLower.setStyle(style);
        }

        @Override
        public void clicked(InputEvent event, float x, float y) {
            super.clicked(event, x, y);
            System.out.println(event.toString());
            double currentValue = Double.parseDouble(Button.getText()
                    .toString());
            if ((int) currentValue != 0)
                currentValue--;
            Button.updateText(Double.toString(currentValue));
        }

        @Override
        public boolean touchDown(InputEvent event, float x, float y,
                int pointer, int button) {
            if (Gdx.input.isButtonPressed(Buttons.LEFT)) {
                double currentValue = Double.parseDouble(Button.getText()
                        .toString());
                if ((int) currentValue != 0)
                    currentValue--;
                Button.updateText(Double.toString(currentValue));
            }
            return super.touchDown(event, x, y, pointer, button);
        }

Upvotes: 0

Views: 511

Answers (1)

clearlyspam23
clearlyspam23

Reputation: 1694

without knowing which of your classes implements your InputListener, it's a little hard to tell you exactly what to do to fix your problem. However, in the general sense what you probably want to do is have a boolean flag set to true on your touchDown method, set to false on your touchUp method, and then in some method that gets called every frame (act, draw, etc., depending on your implementation), youll want to update your text.

The code would look something like

private boolean flag = false;

@Override
public boolean touchDown(InputEvent event, float x, float y,
        int pointer, int button) {
    if (button == Buttons.LEFT) {
        flag = true;    
    }
    //other stuff
    return true; //or whatever you want
}

@Override
public boolean touchUp(InputEvent event, float x, float y,
        int pointer, int button) {
    if (button == Buttons.LEFT) {
        flag = false;    
    }
    //other stuff
    return false; //or whatever you want
}

@Override
public void act(float delta) {
    if (flag) {
        double currentValue = Double.parseDouble(Button.getText()
                    .toString());
            if ((int) currentValue != 0)
                currentValue--;
            Button.updateText(Double.toString(currentValue));
    }
    //other stuff
}

depending on your targetted audience, you may also have to deal with pointer id's in some way (this code example wont work if the user clicks on the label with two fingers, then releases one but not the other)

Upvotes: 1

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