QML - GridLayout - ROW and COLUMN Span - Understanding

[Vildnex]

I'm trying to learn QML and at this moment I'm having some problems with understanding of rowSpan and columnSpan, so sorry if this question may sound stupid for some of you.


WHAT I LEARNED:

Correct me if I'm wrong but in a **GridLayout** should be like this:


Layout.row - indicates the line where the object is located;
Layout.column - indicates the column in which the object is located;
Layout.rowSpan - indicates how many lines should be stretched object;
Layout.columnSpan - indicates how many columns should be stretched object;


WHAT I'M TRYING TO DO:

Well, in this case, I'm trying to recreate this layout over here
13447

This layout, in theory, should have the followings:


The actual GridLayout should be composed out of 24 columns and 9 rows
RED shape should be at -> col 0, row 1 -> colSpan 3, rowSpan 7
BLUE shape should be at -> col 3, row 1 -> colSpan 8, rowSpan 1
PURPLE shape should be at -> col 3, row 4 -> colSpan 6, rowSpan 3


Or at least that's what I've understood so far.



THE PROBLEM:

After I've coded the QML with the col, row accordantly, and also colSpan and rowSpan I've obtained this instead.

13448

MY CODE:



import QtQuick 2.5
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.1

Item {
width: 1366
height: 512

GridLayout {
id: grid

columns: 24
rows: 9
anchors.fill: parent

Rectangle {

property var rowSpan: 7
property var columSpan: 3

Layout.column: 0
Layout.row: 1

Layout.preferredWidth: (parent.width / parent.columns) * columSpan
Layout.preferredHeight: (parent.height / parent.rows) * rowSpan

Layout.columnSpan: columSpan
Layout.rowSpan: rowSpan

color: "red"

}

Rectangle {
property var rowSpan: 1
property var columSpan: 8

Layout.column: 3
Layout.row: 1

Layout.preferredWidth: (parent.width / parent.columns) * columSpan
Layout.preferredHeight: (parent.height / parent.rows) * rowSpan

Layout.columnSpan: columSpan
Layout.rowSpan: rowSpan

color: "blue"
}
Rectangle {
property var rowSpan: 3
property var columSpan: 6

Layout.column: 4
Layout.row: 3

Layout.preferredWidth: (parent.width / parent.columns) * columSpan
Layout.preferredHeight: (parent.height / parent.rows) * rowSpan

Layout.columnSpan: columSpan
Layout.rowSpan: rowSpan

color: "purple"
}
}
}

Could anyone explain to me what I'm doing wrong or which part of GridLayout I didn't get it right?