c# - IsMouseOver and DragLeave not working properly -


i have grid/panel on ui can take drop action. control grid dynamically created content in (a viewbox containing stack panel of borders if matters).

when drag relevant information grid want change (regenerate) internal content , when drops or leaves should go normal. have 'change it' , 'put back' methods working fine, i'm having trouble determining when call them.

i have drag enter , drag leave events on grid. enter works great, leave not. mouse gets on top of content inside of grid fires drag leave event, changes content (and if puts out of child content fires drag enter again , flashes).

my first thought determine if mouse still on grid , ditch out without putting content back. doesn't seem working. here code drag leave:

        private void grid_dragleave(object sender, drageventargs e)     {         var wizard = datacontext wizardvm;         var gd = sender grid;          if (wizard == null || gd == null || gd.ismouseover ||             gd.children.cast<frameworkelement>().any(x => x.ismouseover)) return;          wizard.assembly.collapsepreview();     }

as can see, tried iterate children of grid , see if mouse on true on of , ditch out, , still keeps returning false of , collapsing. thought ismouseover supposed tell me if mouse on @ if it's children of control...

ok after more research found seems working. ended having use visualtreehelper.hittest , use overload has callback , gets hit items if it's obscured. here final code:

    void grid_dragleave(object sender, drageventargs e)     {         var wizard = datacontext wizardvm;         var gd = sender grid;          if (wizard == null || gd == null) return;         point pt = e.getposition(this);         hitresults.clear();         visualtreehelper.hittest(gd, null, gridhittestresultcallback,             new pointhittestparameters(pt));          if (!hitresults.contains(gd))         {             wizard.assembly.isexpanded = false;         }     }      hittestresultbehavior gridhittestresultcallback(hittestresult result)     {         hitresults.add(result.visualhit);         return hittestresultbehavior.continue;     }

basically gets point in relation full window, calls hittest point , overall grid i'm trying work with. callback populates list of visuals hit hit test. last original method checks if grid in list of hits , if not collapses it.

as side note changed .expandpreview() , .collapsepreview() methods .isexpanded property unrelated reasons... didn't want confused change...


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom
Read more