gwt小部件 - 互斥式切换按钮

Question

我想要一个ToggleButton和RadioButton的混合体.我想要RadioButton的"互斥"部分,以及ToggleButton(上下状态)的gui外观和行为.一个人已经存在吗？

Answer 1

我已经改编了kirushik的解决方案并创建了一个简单的"ToggleButtonPanel"小部件,它接受任意数量的ToggleButtons(可能还有你想添加的任何其他小部件)和你选择的面板(默认为VerticalPanel)并使按钮相互关联独家.

这有什么好处的,当单击按钮时,面板本身会触发ClickEvents.这样,您可以将单个ClickHandler添加到ToggleGroupPanel,然后使用event.getSource()确定单击了哪个按钮

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);
            }
        };
    }

}