I am using KineticJS for implementing a graphical editor. I would like to drag a KineticJS Group and drop it into another shape. So far so good, done binding the "dropend" event to a handler in the group.
But I would like to change color to the potential destination shape while hovering on it during dragging, so as to give evidence that it is a suitable shape for drop.
I can't see a way of doing it and I am not been able to find any help in Kinetic documentation. How could I do?
Thanks,
eca
After some mumbling, I think I have found a solution:
var aShape = new Kinetic.Shape(...);
:
aShape.on("dragmove", function(evt) {
// Detect shapes under mouse position
var pos = aShape.getStage().getUserPosition(evt);
var collidingShapes = aShape.getStage().getIntersections(pos);
:
// If needed, filter out colliding shapes not suitable for drop
:
// Highlight drop target candidates, e.g. simulating a "mouseover"
for (var iTarget = 0; iTarget < collidingShapes.length; ++iTarget)
collidingShapes[iTarget].simulate("mouseover");
// If you need to remove highlighting, keep track of previously
// highlighted shapes and call simulate("mouseout") on those
// not currently in the candidates set.
});
Though what you did is actually working, I find it very slow. What I did, was to replace the line 3142 of kineticjs (v4.0.1):
else if(this.targetShape && !go.drag.moving)
with
else if (this.targetShape)
and it works like a charm. The mouseout and mouseover events are now fired.
Anyway, I don't know why, but there had been a property of the stage object (shapedragging or so) which pointed to a potential target, but it had been removed.
Related
I'm using Leaflet.markercluster 1.0.1
I'm trying to add button on my map, so users can enter in 'edit mode'. On click on that button it should toggle dragging state for all markers. I don't really know how to implement that correctly, but I wrote that code
var drag = false;
$('#button').on('click', function () {
drag = !drag;
markers.eachLayer(function (marker) {
marker.options.draggable = drag;
if (marker.dragging) {
drag ? marker.dragging.enable() : marker.dragging.disable();
}
});
});
It works for some time, but then I get Exception on .enable()
Uncaught TypeError: Cannot read property 'classList' of null
Is anyone know any correct way to do that?
Thanks in advance!
It seems that the logic for the forEach method in MarkerClusterGroup iterates through markers not visible on the map after dragging a spiderified marker. Then the logic for enabling dragging fails, as the marker does not have an icon instance, because it has been removed from the map.
I've cleaned up the reproducible example a bit, and left a copy at https://playground-leaflet.rhcloud.com/qate/1/edit?html,output - I strongly suggest that you turn this into a good bug report in the Leaflet.MarkerCluster.
You may also check if each of the markers has a marker._map private property to check if they are on the map, and skip those which are not, but this may lead to other issues down the road.
I'm using HammerJS to abstract drag, scale and rotate for desktop and mobile. All I'm missing is drop. How do I define an element as a drop target that throws an event when another element is dragged over or dropped onto it? Something like jQueryUI's droppable that will work with HammerJS?
Thanks.
Just solved that today.
On dropping object, set a global "look for me" flag. and then setTimeout() to shortly (say 30ms) set it back to false.
Hide (and move) the dropped object, putting it back after a short time allowing the onMouseOver and onMouseOut events to trigger on the drop target object.
Watch those events for the "look for me" flag.
I haven't really tried it much yet.
(My first post.)
The only one fast way for detect drop target element is to use
document.elementFromPoint
Like this:
function dragEnd($event){
var targetEl = document.elementFromPoint($event.gesture.center.pageX, $event.gesture.center.pageX);
your code
}
In Leaflet, is it possible to define a marker or polyline with {clickable:false}, so that a click is passed through to whatever lies beneath - be it the map or a clickable geometry object?
At the moment I solve this problem by making the marker/polyline clickable and passing the event onwards myself. But this leads to the mouse cursor always showing as the hand symbol. Ideally, the mouse cursor should look like the normal pointer or the hand, depending on whether what is beneath the marker/polyline is clickable.
This may not be the answer you are looking for, but you can use featureGroups to have all of your clickable polylines come to the front so that the actions are surfaced.
var lg_noclick = new L.FeatureGroup().addTo(map);
var lg_click = new L.FeatureGroup().addTo(map);
// Add lines
lg_click.bringToFront();
updated fiddle
Also if you can afford to know your lines before hand, correct ordering of when you add the lines it will work as well.
I know this is not ideal but it suited my situation just fine, so it might be good for you as well.
This hides the icon and brings it back after a second using mouseenter and mouseleave events:
$('.leaflet-marker-icon').mouseenter(function() {
$(this).hide();
});
$('.leaflet-marker-icon').mouseleave(function() {
$(this).delay(1000).show(0);
});
I've been playing around with UIToolkit, and it's awesome. Though my clicks pass through the buttons, so when clicking the UI my raycast also starts. Is there a way to check if a click/touch is on the GUI?
Edit: I'm using Prime31's UIToolkit
Solved:
foreach (var touchable in _gui.touchableSprites) {
if ( !touchable.hidden && touchable.hitTest(new Vector2(clickPos.x, Screen.height - clickPos.y)) ) return;
}
Thanks.
Assuming you're using prime31's UIToolkit, take a look at the UIToolkit.cs(lines 81-95)
) script The author works an example showing how to handle highlighting his TouchableSprites. The same functionality can be adapted to doing a MouseOver event. I'm not sure if the author has added this functionality since 2011, I've not used UIToolkit in awhile.
Alternatively you can modify all of your ray tracing to return if the first layer hit is "UILayer" (UIToolkit's layer).
A third method, one that I use, is to create a global GUI element manager that stores a list of all GUI rects. When I add a new ray tracing function I call my manager class to see if the mouse cursor is contained in any GUI rect (there is a bit more sophistication that merges overlapping rects), if so, the ray trace is skipped.
My code does a .pantolatlong then a .showinfobox
The info box does not appear, unless I remove the pantolatlong. I guess it is stopping it. I tried adding it to the endpan event but that did not work.
What is the simplest way to pan to a pushpin and display the infobox for it?
I was using setcenter, but I discovered that sometimes setcenter pans, and this breaks it.
After some insane googling, I came up with the solution, and I'll share it here so that others can hopefully not have the grief I went through.
I created and power my bing map using pure javascript, no sdk or iframe solutions. In my code, I generate the javascript to add all of the pins I want to the map, and inject it using an asp.net label.
If you call the setCenter() method on your Bing Map, it is supposed to instantly set the map, surprise surprise, to the coordinates you specify. And it does... most of the time. Occasionally though, it decides to pan between points. If you do a SetCenter, followed by a ShowInfoBox, it will work great, unless it decides to pan.
The solution? Being great programmers we are, we dive into the sdk, and it reveals there are events we can hook into to deal with these. There is an onendpan event, which is triggered after a pan is completed. There is also an onchangeview event, which triggers when the map jumps.
So we hook into these events, and try to display the infobox for our pushpin shape... but nothing happens. Why not?
You have to give it a few milliseconds to catch its breath, for unknown reasons, when the event is called. Using a setTimeout with 10 milliseconds seems to be fine. Your box will appear great after this.
The next problem is, you only want it to appear when it pans via whatever you used to make it flick between your pushpins (in my case, a table with onclick methods). I create/destroy the event handlers on the fly, although there are other options such as using a global variable to track if the user is panning, or if the system is panning in response to a click.
Finally, you have the one bug that comes from this. If you click a place in your list, and it jumps/pans to that location, the infobox will display fine. If the user dismisses it though, then clicks again on the list item, the map does not move, and therefore no events are triggered.
My solution to this is to detect if the map moved or not, by recording its long/lat, and using another setTimeout method, detecting if they changed 100ms later. If they did not, display the infobox.
There are other things you need to keep track of, as there is no way I can see to pass parameters to the eventhandlers so I use global javascript variables for this - you have to know which pushpin shape you are displaying, and also keep track of the previous mapcoordinates before checking to see if they changed.
It took me a while to piece all this together, but it seems to work. Here is my code, some sections are removed:
// An array of our pins to allow panning to them
var myPushPins = [];
// Used by the eventhandler
var eventPinIndex;
var oldMapCenter;
// Zoom in and center on a pin, then show its information box
function ShowPushPin(pinIndex) {
eventPinIndex = pinIndex;
oldMapCenter = map.GetCenter();
map.AttachEvent("onendpan", EndPanHandler);
map.AttachEvent("onchangeview", ChangeViewHandler);
setTimeout("DetectNoMapChange();", 200);
map.SetZoomLevel(9);
map.SetCenter(myPushPins[pinIndex].GetPoints()[0]);
}
function EndPanHandler(e) {
map.DetachEvent("onendpan", EndPanHandler);
setTimeout("map.ShowInfoBox(myPushPins[eventPinIndex]);", 10);
}
function ChangeViewHandler(e) {
map.DetachEvent("onchangeview", ChangeViewHandler);
setTimeout("map.ShowInfoBox(myPushPins[eventPinIndex]);", 10);
}
function DetectNoMapChange(centerofmap) {
if (map.GetCenter().Latitude == oldMapCenter.Latitude && map.GetCenter().Longitude == oldMapCenter.Longitude) {
map.ShowInfoBox(myPushPins[eventPinIndex]);
}
}
Here is another way:
function addPushpin(lat,lon,pinNumber) {
var pinLocation = new Microsoft.Maps.Location(lat, lon);
var pin = new Microsoft.Maps.Pushpin(map.getCenter(), { text: pinNumber.toString() });
pinInfobox = new Microsoft.Maps.Infobox(pinLocation,
{ title: 'Details',
description: 'Latitude: ' + lat.toString() + ' Longitude: ' + lon.toString(),
offset: new Microsoft.Maps.Point(0, 15)
});
map.entities.push(pinInfobox);
map.entities.push(pin);
pin.setLocation(pinLocation);
map.setView({ center: pinLocation});
}