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How to use Interaction.EventTrigger and bubbling custom events in WPF


How to use Interaction.EventTrigger and bubbling custom events in WPF

By : P.D
Date : November 21 2020, 03:00 PM
will be helpful for those in need Normally, the routed event system permits handlers for any routed event to be attached to any UIElement or ContentElement. That's how the routed events work.
However, the System.Windows.Interactivity.EventTrigger is not a part of the visual tree and therefore cannot participate in this routed event dispatching. The EventTrigger subscribes directly to the CLR event with given EventName (using Reflection: Type.GetEvent).
code :


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How to listen to custom events on all windows, bubbling issue?

How to listen to custom events on all windows, bubbling issue?


By : C. Woody Butler
Date : March 29 2020, 07:55 AM
Hope this helps ok, now i see what you mean, but according to MDN you need to use this:
code :
document.addEventListener("MyExtensionEvent", function(e) { myExtension.myListener(e); }, false, true);
// The last value is a Mozilla-specific value to indicate untrusted content is allowed to trigger the event
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

    <div id="main-content"><button onclick="trigger()">Trigger custom event</button></div>

    <script type="text/javascript">

        function trigger(){
            var myEvent = new CustomEvent('peakAhBoo', {
                'detail': {
                    'hazcheeseburger': true
                }
            });
            var myEvent = window.document.createEvent('CustomEvent');
            var myEventDetail = {hello:'world'};
            myEvent.initCustomEvent('peakAhBoo', true, true, myEventDetail);
            window.dispatchEvent(myEvent);
            console.log(myEvent)
        }

    </script>
</body>
</html>
function respondToCustomEvent_peakAhBoo(e){
    console.log('g: '+e.target);
}

gBrowser.addEventListener("peakAhBoo", respondToCustomEvent_peakAhBoo, false, true);
Vuejs - bubbling custom events

Vuejs - bubbling custom events


By : Tal
Date : March 29 2020, 07:55 AM
I wish this help you There are 4 options I know of
Re-emit events like you did Use this.$parent (repetitively) on the child component to access the desired parent and emit the event. (see "Implement your own bubbling event plugin" below) Use an event bus that is provided by the parent and injected in the children. Use a Vuex store and push events to an event queue in the child component. Somewhere else in the app, watch that reactive event queue for new elements or just bind it to something. Implement your own bubbling event plugin
code :
// Add this as a Vue plugin
Vue.use((Vue) => {
  Vue.prototype.$bubble = function $bubble(eventName, ...args) {
    // Emit the event on all parent components
    let component = this;
    do {
      component.$emit(eventName, ...args);
      component = component.$parent;
    } while (component);
  };
});

// Some nested components as an example

// note usage of "$bubble" instead of "$emit"
Vue.component('component-c', {
  template: `
    <button type="button" @click="$bubble('my-event', 'payload')">
      Emit bubbling event
    </button>`,
});

Vue.component('component-b', {
  template: `<component-c @my-event="onMyEvent" />`,
  
  methods: {
    onMyEvent(...args) {
      console.log('component-b listener: ', ...args);
    },
  },
});

Vue.component('component-a', {
  template: `<component-b @my-event="onMyEvent" />`,
  
  methods: {
    onMyEvent(...args) {
      console.log('component-a listener: ', ...args);
    },
  },
});

var vapp = new Vue({
  el: '#app',

  methods: {
    onMyEvent(...args) {
      console.log('root listener: ', ...args);
    },
  },
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <component-a @my-event="onMyEvent" />
</div>
Vue.component('dyn-menu', {
  components: {
    'menu-item': {
      template: '<li @click="itemClick">{{item.text}}</li>',
      props: ['item'],
      inject: ['eventBus'], // <-- Inject in the child
      methods: {
        itemClick() {
          // Emit the event on the event bus
          this.eventBus.$emit('dyn-menu-item-click', ['menu-item dyn-menu-item-click']);
        }
      }
    }
  },

  // ...
});

var vapp = new Vue({
  el: '#app',
  data: {
    // ...
    eventBus: new Vue(),
  },
  provide() {
    return {
      // The parent component provides the event bus to its children
      eventBus: this.eventBus,
    };
  },

  created() {
    // Listen to events on the event bus
    this.eventBus.$on('dyn-menu-item-click', this.menuClick);
  },
  methods: {
    menuClick(message) {}
  }
})
How to implement (bubbling) validation events for custom WPF control

How to implement (bubbling) validation events for custom WPF control


By : Dipali R Salve
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The IDataErrorInfo and INotifyDataErrorInfo are supposed to be implemented on the model side, not on the UI side. Then you can set the ValidatesOnDataErrors = True or ValidatesOnNotifyDataErrors = True options on your Bindings, so that the binding validation system jumps in. There are some good tutorials on the web about that. It's not the UI telling that something is invalid, but the data this UI represents.
The data validation concept is tightly coupled with the data bindings. If you want your user control to perform its own "UI" validation, use the coercing and validation callbacks of the dependency properties. However, this has nothing to do with the data validation of the binding system. The validation callback will cause the property system to throw an exception that you can handle as you wish (e.g. you can use the ExceptionValidationRule for your bindings).
Empty EventName in Interaction EventTrigger

Empty EventName in Interaction EventTrigger


By : SQU
Date : March 29 2020, 07:55 AM
With these it helps Your Command gets called when the Loaded event occurs.
If we look at the source code of the EventTrigger class, we can see that the DependencyProperty EventNameProperty has Loaded as its default value.
code :
public static readonly DependencyProperty EventNameProperty = DependencyProperty.Register("EventName", typeof (string), typeof (EventTrigger), (PropertyMetadata) new FrameworkPropertyMetadata((object) "Loaded", new PropertyChangedCallback(EventTrigger.OnEventNameChanged)));
Bubbling events within custom components in Flex

Bubbling events within custom components in Flex


By : user38751
Date : March 29 2020, 07:55 AM
will be helpful for those in need The Event constructor defaults the bubbles parameter to false so, as Patrick mentions, you need to set bubbles to true when you construct the event.
Once bubbling is enabled, the event will continue to be dispatched up the UI tree until Event.stopPropagation or Event.stopImmediatePropagation is called.
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