Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-85405

Invisible Column/Layout is not recalculated when contents become invisible

    XMLWordPrintable

Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 5.12.3, 5.15.0
    • Quick: Layouts
    • None
    • macOS 10.14.6, Qt 5.15.0, Qt 5.12.3, Qt 5.9.8
    • macOS

    Description

      When a Column or ColumnLayout is not visible, making content items not visible keeps the positioner/layout size unchanged until it becomes visible again. This is a problem when parent or root view is made invisible, the declarative layout does not work as expected.

      Reproduction steps:

      1. Run the attached code
      2. Click right button twice to make button invisible and visible
      3. (Observe layout changes)
      4. Click left button to make column invisible
      5. Click right button to make button invisible
      6. Click left button to make column visible

      Expected:

      Column should have no height

      Actual:

      Columne has height of invisible button

      Reproduction:

      Always

      Workaround:

      Change button width or height to 0 when invisible

       

      import QtQuick 2.9
import QtQuick.Window 2.0
import QtQuick.Controls 1.0
import QtQuick.Layouts 1.0

Window {
    visible: true
    width: 640
    height: 320
    title: qsTr("Buttonmind")

    property bool buttonVisible: true

    Button {
        id: hideAndSeek
        width: 150
        anchors.left: parent.left
        text: "Show/hide Column"
        onClicked: layout.visible = !layout.visible
    }
    Text {
        anchors {
            top: hideAndSeek.bottom
            topMargin: 5
            horizontalCenter: hideAndSeek.horizontalCenter
        }
        text: layout.visible ? "Layout visible" : "Layout hidden"
    }

    Button {
        id: buttonToggler
        anchors.right: parent.right
        width: 150
        text: "Show/hide Button"
        onClicked: buttonVisible = !buttonVisible
    }
    Text {
        anchors {
            top: buttonToggler.bottom
            topMargin: 5
            horizontalCenter: buttonToggler.horizontalCenter
        }
        text: buttonVisible ? "Button visible" : "Button hidden"
    }

    Column
    {
        id: layout
        visible: true
        anchors {
            horizontalCenter: parent.horizontalCenter
            top: parent.top
            topMargin: 50
        }
         Button {
            id: button
            width: 150 // workaround: visible ? 150 : 0
            text: "Button"
            visible: buttonVisible
            onClicked: buttonVisible = !buttonVisible
        }
    }
    Rectangle {
        anchors.fill: layout
        color: "transparent"
        border {
            width: 2
            color: "green"
        }
    }
    Rectangle {
        anchors {
            top: layout.bottom
            topMargin: 5
            horizontalCenter: layout.horizontalCenter
        }
        width: 250
        height: 30
        color: "grey"

        Text {
            anchors.centerIn: parent
            color: "white"
            text: "Green rectangle anchors to Column"
        }
    }
}

      Attachments

        Issue Links

          is required for

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-95209 FontDialog doesn't react well to being resized

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported
          No reviews matched the request. Check your Options in the drop-down menu of this sections header.

          Activity

            People

              qt.team.quick.subscriptions Qt Quick and Widgets Team
              pavol.markovic Pavol Markovic
              Votes:
              1 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

                Created:
                Updated:

                Gerrit Reviews

                  There are no open Gerrit changes