How to fit and align items of GridView?

[Ibrahim]

Hi. I wrote this code:

Window {
  visible: true
  width: 640
  height: 480
  title: qsTr("Hello World")

  GridView {
    id: area
    width: parent.width
    height: parent.height
    anchors.centerIn: parent
    anchors.margins: 20
    cellWidth: width / 4
    cellHeight: height / 4

    model: 40
    clip: true
    interactive: false

    delegate: Rectangle {
      id: rect
      width: area.cellWidth - 5
      height: area.cellHeight - 5
      color: 'red'
      Text {
        text: index
        color: 'white'
        anchors.centerIn: parent
      }
      MouseArea {
        anchors.fill: parent
        onClicked: rect.visible = false
      }
    }
  }

I set model as 40 and I set interactive as false. But I see just 15 items like this:

I want to fit all items to screen. How can I do it? I didn't use GridLayout because when I click the rectangle, I set visible of that rectangle as false and GridLayout aligns all rectangles again. But I don't want it.
Also if I set model of GridView as 4, I get this result:

But I want like this (4 items aligned to center):

How can I do them (to fit and align)? Thanks.

UPDATE! - SOLVED!

import QtQuick 2.10
import QtQuick.Window 2.10
import QtQuick.Layouts 1.3

Window {
  visible: true
  width: 420
  height: 720
  title: qsTr("Hello World")


  GridView {
    id: area

    property int verticalChoice: (parent.width < parent.height) ? 4 : model / 4
    property int horizontalChoice: (parent.width < parent.height) ? model / 4 : 4

    width: (model < 8) ? 2 * cellWidth : cellWidth * verticalChoice
    height: (model < 8) ? 2 * cellHeight : cellHeight * horizontalChoice
    anchors.centerIn: parent

    cellWidth: (parent.width / verticalChoice)
    cellHeight: (parent.height / horizontalChoice)

    model: 8
    clip: true
    interactive: false

    delegate: Item {
      width: area.cellWidth
      height: area.cellHeight
      Rectangle {
        id: rect
        anchors {
          fill: parent
          margins: 5
        }
        color: 'red'
        Text {
          text: index
          color: 'white'
          anchors.centerIn: parent
        }
      }
    }
  }
}

But anchors.centerIn: parent isn't working.

[raven-worx]

@Ibrahim
you need to calculate the size of the GridView yourself based on the desired values/behavior.
And then center it in the parent (anchors.centerIn: parent).

To show all 40 items, you of course need to also adapt the cellSize dynamically.

[Ibrahim]

@raven-worx thanks, how can I set cellSize? Is this a property? Because I couldn't find it.

[raven-worx]

@Ibrahim said in How to fit and align items of GridView?:

@raven-worx thanks, how can I set cellSize? Is this a property? Because I couldn't find it.

you are already using it in the code you've posted?! (cellWidth / cellHeight)