Gwt widget - mutually exclusive toggle button

Question

I need a hybrid of ToggleButton and RadioButton . I want the “mutually exclusive” part of RadioButton, as well as the look and feel of Gui ToggleButton (state up and down). Does it already exist?

Answer 1

I adapted the kirushik solution and created a simple ToggleButtonPanel widget that accepts an arbitrary number of ToggleButtons (and possibly any other widgets you want to add) and a panel of your choice (VerticalPanel by default) and makes the buttons mutually exclusive.

What is nice is that the panel itself launches ClickEvents when buttons are clicked. That way you can add one ClickHandler to ToggleGroupPanel and then determine which button was clicked using event.getSource ()

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Panel;
import com.google.gwt.user.client.ui.ToggleButton;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

public class ToggleButtonPanel extends Composite implements HasWidgets, HasClickHandlers{

    public ToggleButtonPanel() {
        this(new VerticalPanel());
    }

    public ToggleButtonPanel(Panel panel){
        this.panel = panel;
        initWidget(panel);
    }

    @Override
    public void add(Widget w) {
        if(w instanceof ToggleButton){
            ToggleButton button = (ToggleButton) w;
            button.addClickHandler(handler);
        }
        panel.add(w);
    }

    @Override
    public void clear() {
        panel.clear();
    }

    @Override
    public Iterator<Widget> iterator() {
        return panel.iterator();
    }

    @Override
    public boolean remove(Widget w) {
        return panel.remove(w);
    }

    @Override
    public void setWidth(String width) {
        panel.setWidth(width);
    };

    @Override
    public void setHeight(String height) {
        panel.setHeight(height);
    }

    private final Panel panel;
    private ClickHandler handler = new ClickHandler(){
        @Override
        public void onClick(ClickEvent event) {
            Iterator<Widget> itr = panel.iterator();
            while(itr.hasNext()){
                Widget w = itr.next();
                if(w instanceof ToggleButton){
                    ToggleButton button = (ToggleButton) w;
                    button.setDown(false);
                    if(event.getSource().equals(button)) {
                        button.setDown(true);
                    }
                }
            }

            for(ClickHandler h : handlers){
                h.onClick(event);
            }
        }
    };

    private List<ClickHandler> handlers = new ArrayList<ClickHandler>();
    @Override
    public HandlerRegistration addClickHandler(final ClickHandler handler) {
        handlers.add(handler);
        return new HandlerRegistration() {

            @Override
            public void removeHandler() {
                handlers.remove(handler);
            }
        };
    }

}

Answer 2

Here is my pure-gwt option:

class ThreeStateMachine extends FlowPanel{
        // This is the main part - it will unset all the buttons in parent widget
        // and then set only clicked one.
        // One mutual handler works faster and is generally better for code reuse
        private final ClickHandler toggleToThis = new ClickHandler() {
                @Override
                public void onClick(ClickEvent clickEvent) {
                    for(Widget b: ThreeStateMachine.this.getChildren()){
                        ((ToggleButton)b).setDown(false);
                    }
                    ((ToggleButton)clickEvent.getSource()).setDown(true);
                }
            };

        private ThreeStateMachine() { // Create out widget and populat it with buttons
            super();

            ToggleButton b = new ToggleButton("one");
            b.setDown(true);
            b.addClickHandler(toggleToThis);
            this.add(b);

            b = new ToggleButton("two");
            b.addClickHandler(toggleToThis);
            this.add(b);

            b = new ToggleButton("three");
            b.addClickHandler(toggleToThis);
            this.add(b);
        }
    }

Of course, you will need css styles for gwt-ToggleButton with options (-up-hovering, etc.)

Answer 3

-, , , . , . , , "GUI Content". , , , .

    public class MutuallyExclusiveToggleButtonCollection {

      List<ToggleButton> m_toggleButtons = new ArrayList<ToggleButton>();

       public void add(ToggleButton button) {
          m_toggleButtons.add(button);
          button.addClickListener(new ExclusiveButtonClickHandler());
     }

    private class ExclusiveButtonClickHandler impelments ClickHandler {
       public void onClick(ClickEvent event) {
          for(ToggleButton button : m_toggleButtons) {
            boolean isSource = event.getSource().equals(button);
            button.setIsDown(isSource);       
       }

   }

  }

Answer 4

, UIBinder :

<my:RadioToggleButton buttonGroup="btnGroup" text="Button 1" />

:

import java.util.HashMap;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.uibinder.client.UiConstructor;
import com.google.gwt.user.client.ui.ToggleButton;

public class RadioToggleButton extends ToggleButton
{
    private static HashMap<String,ButtonGroup> buttonGroups = new HashMap<>();
    private ButtonGroup buttonGroup;

    public @UiConstructor RadioToggleButton( String buttonGroupName )
    {
        buttonGroup = buttonGroups.get( buttonGroupName );
        if( buttonGroup == null ){
            buttonGroups.put( buttonGroupName, buttonGroup = new ButtonGroup() );
        }
        buttonGroup.addButton( this );
    }

    @Override
    public void setDown( boolean isDown )
    {
        if( isDown ){
            RadioToggleButton btn = buttonGroup.pressedBtn;
            if( btn != null ){
                btn.setDown( false );
            }
            buttonGroup.pressedBtn = this;
        }
        super.setDown( isDown );
    }

    private class ButtonGroup implements ClickHandler
    {
        RadioToggleButton pressedBtn = null;

        public void addButton( ToggleButton button )
        {
            button.addClickHandler( this );
        }

        @Override
        public void onClick( ClickEvent event )
        {
            Object obj = event.getSource();
            if( pressedBtn != null ){
                pressedBtn.setDown( false );
            }
            pressedBtn = (RadioToggleButton)obj;
            pressedBtn.setDown( true );
        }
    }
}

Answer 5

gwt-ext toggleButtons

" Toggle. Buttons " ".

Bold, Italic Underline , , , , . "

Answer 6

ClickHandler ToggleButtons. , ToggleButtons home, tree, summary, detail.

 public class Abc extends Composite implements ClickHandler {
        ToggleButton home, tree, summary, detail
        public Abc() {
            // all your UiBinder initializations... blah, blah....
            home.addClickHandler(this);
            tree.addClickHandler(this);
            summary.addClickHandler(this);
            detail.addClickHandler(this);
        }
        @Override
        public void onClick(ClickEvent p_event) {
            Object v_source = p_event.getSource();        
            home.setDown(home==v_source);
            tree.setDown(tree==v_source);
            summary.setDown(summary==v_source);
            detail.setDown(detail==v_source);
        }
}

, ClickHandlers ToggleButton.