I'm trying my way around building a graphics editor with Paper.js
I would like to select the first(1st) element that was picked using a selection tool(either Shift+Click, or dragging a selection box). Direct-click detection is done via hit-testing and selection box via getIntersection
If it's Shift+Click its the first selected element. Which element was clicked is found with HitResult
If its selectionBox, the first intersection? result of the selection box.
Is it possible to get this?
I do a FOR loop to get all the elements in the Paper.js selectedItems array which returns all the selected items on the canvas.
I've tried this:
var selected = paper.project.selectedItems;
var firstSelected = selected[0];
but this doesn't return what i need.
The above code snippet fetches an array that is agnostic to which element was selected first. It simply orders the selectedItems in the array starting from the ''oldest drawn path''.
What i need is a way to find out which is the 1st element that was selected.
Either the 1st that get's ''touched(intersected)'' with the selection
rectangle
Or the first that was clicked while in Shift+Click
functionality(Select more than one element with click).
The reason for this is that i would like to add to my editor, align-relative-to functionality.
In order to have a correct UX, the user must have the ability to align an element relative to another that he sets as the ''reference item''. Therefore i need to know the 1st element selected relative to others in order to use it as the ''reference item''.
Any ideas ?
Here is a working example of what I understood you want to achieve for the selection (without the align-relative-to functionality).
And here is the code (under SelectPaperJS) https://c9.io/arthursw/oiio/
It should not be too hard to make something similar on Stylii (since you're using it).
You can have an array to keep track of the order of selection of your items. For example in the mousedown function of the direct select tool (from line 789 of editor.js) you can add the newly selected element to this array (line 800). Same thing when you select with the rectangular selection tool.
Related
Using the demo chart available from the AmCharts website (here), if I know the parent Phoebe, and the child David, how can I programmatically get the David bubble?
My goal is to alter the fill of the bubble, which I can do in an event handler. I just am uncertain of how to select the element I want programmatically, given what I have to work with.
Edit: I realize that I can just traverse graph.data and modify the color attribute, but I can't call graph.invalidateRawData() as that doesn't pick up the coloring change (makes sense). I really would rather not have to force a complete graph redraw!
Thanks!
The easiest way to get a desired node would be to set id data field (it can be the same as your name field) and use series.getDataItemById method to retrieve the data item.
function changeColor(){
let dataItem = networkSeries.getDataItemById(networkSeries.dataItems, "Fifth");
dataItem.node.circle.fill = am4core.color("#00ff00");
// change color of all children
dataItem.children.each(function(child){
child.node.circle.fill = am4core.color("#00ffff");
})
}
Here is a demo:
https://codepen.io/team/amcharts/pen/mZMYKx
The demo also illustrates how access and change color of all children of the data item.
I want to make a very simple mix and match system, where the user chooses items from a select drop down menu which triggers things. I have buttons that are appended to the document in a rather off the cuff manner, that is to say, whenever the user chooses something from the select some text will appear as well as a button to remove that text (and corresponding button). I'm using D3 to manipulate selections, add classes and append things. I use classes to tell the button which text to remove. All that being said, I believe this still could simply be a native javascript problem I'm running into. The problem is as follows:
After you choose some things from the select drop down menu, and then proceed to click the x buttons in the order bottom to top, the behavior is as desired. However, if you click a button at the top or in the middle, the button will not remove the right text. I believe that is because the button is simply removing whatever the latest string value of the dynamic class I'm using. That makes me doubt that the button actually retains the initial properties of its .on('click', function() {}) (hence the post title).
If that's the case, I'm not really sure how to circumvent such an issue, as the buttons are dynamic in nature.
Very short and simple example here.
No need to retain memory kind of thing just make sure your element is accessible one such scenario would be to save the id reference of element as class of another element like this
d3.select('body').append('button')
.text('X')
.attr('id','b'+(intCount+1))
.attr('class',choice+'1') //class is the id of the text element
.on('click', function(d,i) {
var t = d3.select(this).attr('id')
var c = d3.select(this).attr('class')
var thisChoice = choice;
d3.selectAll('.' + t).remove(); //remove this element
d3.selectAll('.'+ c).remove(); //remove text element
intCount -= 1;
count -= .7;
});
working FIDDLE
I'm not sure whether I'm using the right terminology here - but here is an example:
https://gist.run/?id=57ed46429e4583eb4c3fb11814451a55
This is how it looks like in Chromium:
Basically, the entries on top (red outline) are a visualization of an array as the "first-level" data display; here one can toggle each element's selection, and make a multi-element selection (red background). The array that is the source of the "first-level" display is mydata in first-level-items.js.
Those items that are selected in "first-level", are then shown again in "second-level" (green outline); here the same information of name and value is displayed, although a bit differently. Here also one can toggle an elements selection - but only one "second-level" element can be selected. The array that is the source of the "second-level" display is myseldata in second-level-items.js.
The intent here, is that once a "second-level" selection has been made, a slider appears, to change the .value property of the particular object which is the selected array element.
My original question (which is why I started this post/example at all), was:
How do I ensure that whenever the slider is changed, the value is updated in both second-level and first-level display?
... however, for reasons beyond me, this in fact does work somewhat in this gist.run example (but it still doesn't work in my actual project, which forced me to come up with the example to begin with). Also it only works somewhat, in the sense that when loading the example page at first, after making first and second level selections, and then changing the slider, the .value will be updated in both first- and second-level display. But as soon as I try deselecting on second level - or changing the selection on second level - then updating stops. So, I guess this question still stands...
After a second-level selection has been made, deselecting on second level (by clicking to toggle) does NOT remove the slider; how can I have it behave like that?
The update happens only on the slider's onChange - basically, while you drag and slide, this component emits onSlide, but it will generate onChange only at the end when the mouse is released (that is, when the sliding has stopped). How can I update both first- and second- level display while the slider is sliding?
And finally - is this how this kind of a problem is best addressed in Aurelia? That is - I currently have one array in first-level-items.js; first-level-items.js then has a singleton reference to second-level-items.js, so it can call a method within it, to change a filtered copy of the array on the second level, which then serves as a source both for second-level display and the slider... Is there a better way to organise this?
Boy, this was a pain, but here's what I think is the solution:
https://gist.run/?id=c09fea3b82a9ebc41e0a4c90e8665b04
Here are some notes:
Apparently, there is something wrong applying if.bind or show.bind on the input element of the slider - instead, the input element should be put in an enclosing div, and the div should have if/show.bind applied
Furthermore, if.bind should not be used, as it re-instantiates the slider element - use show.bind so we can get a reference to the slider widget at start already, even if it is hidden
Seemingly, using TaskQueue in attached() is the only way to get a reference to the slider at start
Once we have a reference to the widget, re-apply it on each second level element, whenever they change
Do not set this.myselChanging to null to specify no target of the slider (simply count on hiding the slider appropriately)
For a continuous change (onSlide), simply use this.myselChanging.value = e.value; in the handler - both first-level and second-level values will be changed
Beyond this, it seems arrays are copied by reference, so the multi-level update happens without further intervention...
Though, would still love to know what is the proper way to do this...
I am looking to create a tool where I can drag an image from one div to another and on drop, the following to happen:
1 - The dragged image returns to where it came from
2 - A series of controls are added within a container
Similar to https://formbuilder.online/ when a textbox is added to the form.
I understand how to perform the drag (i.e. make the item draggable) and I can understand the drop event. I'm struggling to return the dropped object back to it's original location.
The overall aim is to drop a list item into a sortable list so I can reorder the items (it's similar to the formbuilder linked above, but for a custom application, nothing to do with forms.
I'm just not sure what I need to put into my dropEvent function to return the dragged item to it's location. I can use jQuery append to add the list item containing the controls I want to the list, so that should be fine, it's just the returning the item to where it came from.
Sory, have just seen the documentation and the revert option when making an item draggable.
You might wanna try jQuery Sortable:
https://jqueryui.com/sortable/
I have a problem with my drag and drop code. I want to put multiple items (dragged) in three containers (drop), and then return all values put in the container (thanks to alert(droppableResults);). But this code only returns the first item dropped, and I went all of the items.
Thanks for your help!
I put code in jsfiddle.net for better understanding.
https://jsfiddle.net/vbyyvt2o/1/
The problem you have is that the data-r="" value gets overwritten with every drop.
This results in only the last drop being recorded (not the first one).
Since .dropAble can contain several elements that approach doesn't work. You might however remove the data-r attribute from .dropAble and add a data-q attribute to your.dragAble elements. Then you could modify your JS accordingly and it should work fine.
Here is a modified fiddle:
https://jsfiddle.net/vbyyvt2o/4/