Too bad Item.childAt(...) disregards the z value. It would be exactly that one function I had overlooked and that does the job.
Current behavior of Item.childAt(...) makes no sense, and its documentation is kind of a lie: " Returns the first visible child item found at point (*x*, *y*) within the coordinate system of this item. " It is not visible if it is occluded by an item declared after with a higher z. On Wed, Jun 22, 2022 at 4:06 AM EXT Mitch Curtis <mitch.cur...@qt.io> wrote: > There’s no public API for this specific task, but there have been > suggestions for it: > > > > https://bugreports.qt.io/browse/QTBUG-23745 > > https://bugreports.qt.io/browse/QTBUG-83647 > > > > > > *From: *Interest <interest-boun...@qt-project.org> on behalf of Federico > Ferri <federico.ferri...@gmail.com> > *Date: *Wednesday, 22 June 2022 at 05:26 > *To: *Qt Project MailingList <interest@qt-project.org> > *Subject: *Re: [Interest] Quick Item visibility test / hit test... or > synthesize press event > > I have solved it more or less with this: > > > > function *traverseItemTreeWithClipping*(item, pt, f, rootItem) { > > *rootItem* = *rootItem* || *item* > > var *p* = *item*.mapFromItem(*rootItem*, *pt*) > > var *inItemRect* = *p*.x >= 0 && *p*.y >= 0 && *p*.x < *item*.width > && *p*.y < *item*.height > > if(*item*.clip && !*inItemRect*) return > > *f*(*item*, *p*, *inItemRect*) > > for(var *i* = 0; *i* < *item*.children.length; *i*++) > > *traverseItemTreeWithClipping*(*item*.children[*i*], *pt*, *f*, > *rootItem*) > > } > > > > function *hitTest*(rootItem, pt) { > > var *result* = undefined > > var *z* = -Infinity > > *traverseItemTreeWithClipping*(*rootItem*, *pt*, (item, p, > inItemRect) => { > > if(*item*.visible && *item*.z >= *z* && *inItemRect*) { > > *result* = *item* > > *z* = *item*.z > > } > > }) > > return *result* > > } > > > > It only handles visibility and clipping. If there is a better way or I > overlooked some QtQuick aspect, please let me know. > > Cheers, > > Federico Ferri > > > > > > On Tue, Jun 21, 2022 at 8:54 PM Federico Ferri < > federico.ferri...@gmail.com> wrote: > > Is it possible to find what is the topmost visible item given a pixel > coordinate? > > > > e.g. in this simplified example: > > > > Rectangle { > x: 20; y: 20; width: 20; height: 20; color: 'red'; > Rectangle { > x: 5; y: 10; width: 5; height: 5; color: 'green'; > } > } > > > > it would be the red Rectangle for coordinate (21,21), the green Rectangle > for coordinate (26,32), and none for e.g. (15,15). > > > > Alternatively, I'm happy to equip my Rectangles with a MouseArea > {anchors.fill:parent} each. Is it possible then to synthesize mouse press > events so to exploit Qt Quick's scenegraph/event processing magic? > > > > > >
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