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Details

Type: Bug
Resolution: Unresolved
Priority: P3: Somewhat important
Fix Version/s: None
Affects Version/s: 5.6
Component/s: Quick: Core Declarative QML
Labels:
None
Environment:

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Linux 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 GNU/Linux

Qt Creator 4.4.1

Based on Qt 5.9.2 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit)

Built on Oct 4 2017 04:14:10

From revision 6afdb8bdf9

Desktop Qt 5.6.2 GCC 64bit

C: gcc (x86 64bit in /usr/bin)

C++: gcc (x86 64bit in /usr/bin)

Debugger: gdb

CMake: cmake

CMAKE_CXX_COMPILER:STRING=%\{Compiler:Executable:Cxx}

CMAKE_C_COMPILER:STRING=%\{Compiler:Executable:C}

CMAKE_PREFIX_PATH:STRING=%\{Qt:QT_INSTALL_PREFIX}

QT_QMAKE_EXECUTABLE:STRING=%\{Qt:qmakeExecutable}

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Linux 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64 GNU/Linux Qt Creator 4.4.1 Based on Qt 5.9.2 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit) Built on Oct 4 2017 04:14:10 From revision 6afdb8bdf9 Desktop Qt 5.6.2 GCC 64bit C: gcc (x86 64bit in /usr/bin) C++: gcc (x86 64bit in /usr/bin) Debugger: gdb CMake: cmake CMAKE_CXX_COMPILER:STRING=%\{Compiler:Executable:Cxx} CMAKE_C_COMPILER:STRING=%\{Compiler:Executable:C} CMAKE_PREFIX_PATH:STRING=%\{Qt:QT_INSTALL_PREFIX} QT_QMAKE_EXECUTABLE:STRING=%\{Qt:qmakeExecutable}

Description

Hello!

Such a piece of code produces, possibly, a bug:

import QtQuick 2.6
import QtQuick.Window 2.2
import QtQuick.Layouts 1.3

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

    GridLayout {
        rowSpacing: 50
        columnSpacing: rowSpacing
        columns: 1
        rows: 1
        anchors { fill:parent; margins: rowSpacing; }

        Rectangle {
            color: "gray"
            Layout.alignment: Qt.AlignCenter | Qt.AlignVCenter
            Layout.maximumHeight: 100
            Layout.maximumWidth: 100
            Layout.fillWidth: true
            Layout.fillHeight: true
        }
    }
}

If you do not use dynamic resizing, everything is alright. If you try to resize the window in this example, you might have the outcome like on the screenshots.
It is expected that content's dimensions are decreased to 0, however, they are frozen on some small number at some point.
To workaround this problem you may read layout width or height properties at the moment of scaling to zero size:

    GridLayout {
        // Added id
        id: layout

        rowSpacing: 50
        columnSpacing: rowSpacing
        columns: 1
        rows: 1
        anchors { fill:parent; margins: rowSpacing; }

        Rectangle {
            color: "gray"
            Layout.alignment: Qt.AlignCenter | Qt.AlignVCenter
            // Added conditions
            Layout.maximumHeight: layout.height <= 0 ? 0 : 100
            Layout.maximumWidth: layout.width <= 0 ? 0 : 100

            Layout.fillWidth: true
            Layout.fillHeight: true
        }
    }