swift - Resize superview with autolayout depending on largest subview -


what best practice resize superview autolayout if have inner nsview columns dynamic heights?

for example. if have 2 column layout, left column height bigger right column, superview height should right column height. than, if change right column height bigger left column height, superview height should change height of right column. how accomplish this?

i made sample project test this:

  1. initially have layout 2 columns, .bottom constraint of left nsview attached bottom of superview.

initial state

  1. if press make right bigger button, make height of right nsview bigger left one.

final state

so want here superview change height depending on bigger column (right column). there practice so?

code:

import cocoa  class viewcontroller: nsviewcontroller {      let leftview = nsview()     let rightview = nsview()     let button = nsbutton()      var rightviewheightconstraint: nslayoutconstraint?      override func loadview() {         self.view = testview()     }      override func viewdidload() {         super.viewdidload()          leftview.backgroundcolor = nscolor.redcolor()         rightview.backgroundcolor = nscolor.orangecolor()          layoutleft(view, insertview: leftview)         layoutright(view, insertview: rightview)          button.title = "make right bigger"         button.target = self         button.action = "makebigger:"         viewcontrollerlayout.layoutbotton(view, insertview: button, bottom: -20)     }      func makebigger(sender: anyobject) {         rightviewheightconstraint?.animator().constant = 150.0     }      func layoutleft(containerview: nsview, insertview: nsview) {         insertview.translatesautoresizingmaskintoconstraints = false          containerview.addsubview(insertview)          let c1 = nslayoutconstraint(item: insertview, attribute: .left, relatedby: .equal, toitem: containerview, attribute: .left, multiplier: 1.0, constant: 0.0)         let c2 = nslayoutconstraint(item: insertview, attribute: .width, relatedby: .equal, toitem: containerview, attribute: .width, multiplier: 0.5, constant: 0.0)         let c3 = nslayoutconstraint(item: insertview, attribute: .height, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1.0, constant: 100.0)         let c4 = nslayoutconstraint(item: insertview, attribute: .top, relatedby: .equal, toitem: containerview, attribute: .top, multiplier: 1.0, constant: 0.0)         let c5 = nslayoutconstraint(item: insertview, attribute: .bottom, relatedby: .equal, toitem: containerview, attribute: .bottom, multiplier: 1.0, constant: -60.0)          containerview.addconstraint(c1)         containerview.addconstraint(c2)         containerview.addconstraint(c3)         containerview.addconstraint(c4)         containerview.addconstraint(c5)     }      func layoutright(containerview: nsview, insertview: nsview) {         insertview.translatesautoresizingmaskintoconstraints = false          containerview.addsubview(insertview)          let c1 = nslayoutconstraint(item: insertview, attribute: .right, relatedby: .equal, toitem: containerview, attribute: .right, multiplier: 1.0, constant: 0.0)         let c2 = nslayoutconstraint(item: insertview, attribute: .width, relatedby: .equal, toitem: containerview, attribute: .width, multiplier: 0.5, constant: 0.0)         let c3 = nslayoutconstraint(item: insertview, attribute: .height, relatedby: .equal, toitem: nil, attribute: .notanattribute, multiplier: 1.0, constant: 50.0)         let c4 = nslayoutconstraint(item: insertview, attribute: .top, relatedby: .equal, toitem: containerview, attribute: .top, multiplier: 1.0, constant: 0.0)         let c5 = nslayoutconstraint(item: insertview, attribute: .bottom, relatedby: .equal, toitem: containerview, attribute: .bottom, multiplier: 1.0, constant: -60.0)          containerview.addconstraint(c1)         containerview.addconstraint(c2)         containerview.addconstraint(c3)         containerview.addconstraint(c4)         // containerview.addconstraint(c5) // cant add .bottom constraint here, because of different column sizes.          rightviewheightconstraint = c3     } }  struct viewcontrollerlayout {      static func layoutbotton(containerview: nsview, insertview: nsview, bottom: double) {         insertview.translatesautoresizingmaskintoconstraints = false          containerview.addsubview(insertview)          containerview.addconstraint(nslayoutconstraint(item: insertview, attribute: .centerx, relatedby: .equal, toitem: containerview, attribute: .centerx, multiplier: 1.0, constant: 0.0))         containerview.addconstraint(nslayoutconstraint(item: insertview, attribute: .bottom, relatedby: .equal, toitem: containerview, attribute: .bottom, multiplier: 1.0, constant: cgfloat(bottom)))     } }

download test project: github

first create constraint on superview height 

let heightconstraint = nslayoutconstraint(item: view, attribute: nslayoutattribute.height, relatedby: nslayoutrelation.equal, toitem: nil, attribute: nslayoutattribute.notanattribute, multiplier: 1, constant: greaterheightamongtwocolumns)

as discussed in comment, can post notification , let super view know updated frame. super view check if updated height of of 2 columns greater current height , update heightconstraint declared above , call

[self layoutifneeded]

on superview's superview laid out new frame.


Comments

Post a Comment

Popular posts from this blog

user interface - how to replace an ongoing process of image capture from another process call over the same ImageLabel in python's GUI TKinter -

i trying use following code create interactive gui changes color-space(hsv, rbg, grayscale etc) on event of button click. display opencv video in tkinter using multiprocessing being new python having problems multiprocessing , attempts on making gui change it's color space on button clicks hangs entire system. on it's implementation highly appreciated. thankyou. below code: import cv2 pil import image,imagetk import tkinter tk import numpy np multiprocessing import process , queue def quit_it(root,process): root.destroy() process.terminate() def black_andwhite(root,process): process.terminate p=process(target=capture_image, args=(5,queue, )) p.start() root.after(0, func=lambda: update_all(root, image_label, queue)) def update_image(image_label, queue): frame = queue.get() = image.fromarray(frame) b = imagetk.photoimage(image=a) image_label.configure(image=b) image_label._image_cache = b root.update() def update_all(root...
Read more

javascript - Restarting Supervisor and effect on FlaskSocketIO -

in index.html (html/javascript) have: $(document).ready(function(){ namespace = '/test'; var socket = io.connect('http://' + document.domain + ':' + location.port + namespace); socket.on('connect', function() { socket.emit('join', {room: 'venue_1'}); }); socket.on('my response', function(msg) { $('#log').append('<br>received #' + ': ' + msg.data); }); }); on server have: @socketio.on('connect', namespace='/test') def test_connect(): if session.get('venue_id'): emit('my response', {'data': 'connected'}) session.pop('venue_id', none) else: request.namespace.disconnect() @socketio.on('join', namespace='/test') def join(message): join_room(message['room']) room = message[...
Read more

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending ...
Read more