I am new to cesium so need some very basic help.
How can we swap the behavior of the mouse left button and right button without having to code the behavior ourselves?
Moreover, can someone give me a basic coding example to define our own mouse button event? I have tried to run the one from Sandcastle but it is not working at the moment, can't figure out the problem for now.
You don't need to use Cesium's mouse event system, you can just listen to the normal JavaScript mouse events outside of Cesium and react to them. The DOM element to listen to is the canvas, typically viewer.cesiumWidget.canvas.
Cesium's built-in event system is not easily configurable for now, that's an item on the wishlist. Part of the problem here is that the default behavior changes at runtime. For example, when the camera tracks or un-tracks an entity, the input event wiring gets rearranged on the fly, and customizations may be overwritten. Someday Cesium's event handlers will need to be rewritten to be configurable.
To extend what #emackey stated:
The general recommendation from the Cesium team is to use native JS events whenever possible. The event handlers within the Cesium library are there more for internal library use and plugin modules.
As for how to capture the mouse click/scroll/move events otherwise it would be helpful to have an example of what you tried so far. Though this is a good reference to read http://www.html5rocks.com/en/mobile/touchandmouse/
Related
Is it possible to handle touchEvents with Vue3 without external library?
My need is that the element can be moved (drag and drop in another place) by touch. The elements themselves are rendered using v-for. I implemented mouse control without problems, but with touch I got stuck for a day!
I've found only one library for that: https://github.com/robinrodricks/vue3-touch-events
But I really can't understand where I have to put UDM module and how to execute installation steps like that: "You need to include the UMD script of this plugin and you do not need to register this plugin with vue.js."
I can't believe that such popular framework as Vue3 haven't native touch handlers, so I want to ask an advice.
Touch events are supported natively in Vue, in the same way that they are in JavaScript. But the dragging or swiping functionality, you will need to either build yourself, or use a third-party plugin (like hammer.js).
You can use touch events in a similar way to mouse up/ down. For example:
<MyComponent
#mousedown="startDrag(item)"
#mouseup="endDrag(item)"
#mousemove="startDrag(item)"
#touchstart="startDrag(item)"
#touchend="endDrag(item)"
#touchmove="endDrag(item)"
/>
I'm trying to access the refresh button in react-admin project. I tried using getElementsbyClassName it returns HTMLComponents Object but it isn't accessible i.e I can see the component on printing it to console but isn't accessible by code. Is there a way for me to disable this refresh button wherever I want?
I'm not sure the exact use case here, but you can create your own custom AppBar that renders essentially whatever you want: https://marmelab.com/react-admin/Theming.html#replacing-the-appbar.
also see this GitHub issue that mentions removing it entirely: https://github.com/marmelab/react-admin/issues/3383
Within your custom AppBar you could have some logic checks within your custom AppBar if you know ahead of time when you'll want it disabled (like on a certain page/component).
If you need it to be more dyanimcally disabled, you could probably have a very high-level context/state to control that as well..
**NOTE: I have built a custom AppBar before, but I haven't done any selective rendering or disabling within it. So, I can't guarantee that this is exactly correct, but it fits with other custom components I've built.
Looking to find where we can insert our own data for triggered events.
I have an extension that use to call onImpl(events, selector, data, callback), but that was back in 2.3.7. What is the updated way to add my event data if I want to pass data that can be used with the event?
As far as I know, it is not possible to pass data to core events anymore. But you can do it when you emit the events programmatically.
I'm assuming this is the extension that you mentioned. If you just want the paz/zoom functionality, you can use the pan-zoom extension.
I'm not sure if a toolbar extension would be any useful. The customization of the toolbar with an extension would be very limited. You can create a fancy toolbar, style and position it as you like and connect the buttons with Cytoscape events with jQuery or other similar libraries.
P.S: instead of passing the data to the event, you may keep the data in a global variable and access it from callback function.
I have written a custom UI extension by following the procedure that cystoscape.js recommends. I am using jcanvas library to draw shapes on this ui extension. Everything works great except the click events on these shapes (jcanvas library provides events to bind on the shapes drawn)are not working. Click on these shapes makes only cytoscape core click. jcanvas events are not fired because I think cytoscape eats all the events. Could someone please help me to how to listen to events on the canvas which are overlayed using ui extension?
Thanks
Prakash
Your overlay needs to be on top of the Cytoscape canvases to get events. Take a look at the existing extensions for examples, like panzoom.
Currently most of the SVG framework provides drag and dropping. I have used RaphaelJs , Extjs Drawing , and SVG.js(http://www.svgjs.com/). All of the framework provides the event handling method by binding it with the element itself. For example:
dragStart: function(event){
//'this' refers to the element itself
this.doSomething();
this.moveTo(event.x,event.y);
};
However the consequences of this is that browser performance is greatly degraded, when there are more than hundred of elements and some logic processing aside. My elements will be composite elements, meaning maybe some text or path in a rect but the rect should be the target (or this) of the event when dragged. The elements will have other event to listen to , for example onclick, onDblClick, onHover & etc.
My question is, is there any way to optimize this ? The user experience is bad after the application is showing a lot of the composite elements I mentioned above.
UPDATE:
I have built an application using the mean that i spoke of above. Binding the event handler to each of the objects. The result is not very user friendly when the element is listening to onhover and onmousedown events. I am thinking to optimize the application but not sure how. The effect is more obvious in FF, chrome is better.
Are you sure you need SVG? Fabric.js is an awesome API for scaling, rotating, drag-drop, and grouping, based on the Canvas element.