Details
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Bug
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Resolution: Done
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P2: Important
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QDS 4.2
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QDS Berlin - 2023 Week 45/46, QDS Berlin - 2023 Week 47/48, QDS Berlin - 2023 Week 49/50
Description
Using Qt Creator to load and build "Loginui1" project (https://git.qt.io/public-demos/qtdesign-studio/-/blob/master/tutorial%20projects/Loginui1/CMakeLists.txt ) reveals multiple issues:
1. The application cannot run
We get this runtime error:
QQmlApplicationEngine failed to load component qrc:Main/main.qml:7:1: Type App unavailable qrc:/content/App.qml:41:5: Type Screen01 unavailable qrc:/content/Screen01.ui.qml:36:5: EntryField is not a type
This is because <root>/content/CMakeLists.txt are missing multiple project files.
Solution
The correct version should have:
qt6_add_qml_module(content
URI "content"
VERSION 1.0
QML_FILES
App.qml
EntryField.ui.qml
PushButton.ui.qml
Screen01.ui.qml
RESOURCES
fonts/TitilliumWeb-ExtraLight.ttf
images/adventurePage.jpg
images/qt_logo_green_128x128px.png
)
2. Invalid code in EntryField.ui.qml
After fixing #1, the application can run. However, clicking on the entry fields or the buttons produces runtime errors:
qrc:/content/EntryField.ui.qml:67:13: QML PropertyChanges: Cannot assign to non-existent property "border.color" qrc:/content/PushButton.ui.qml:69:13: QML PropertyChanges: Cannot assign to non-existent property "border.color"
Indeed, the Text QML type does not have a property called "border".
3. Project does not cooperate well with QML tooling
Building the project produces many qmlsc warnings:
[45/90 26.9/sec] Generating .rcc/qmlcache/content_App_qml.cpp
Warning: App.qml:32:1: Warnings occurred while importing module "Loginui1": [import]
import Loginui1
^^^^^^
---
Warning: Failed to import Loginui1. Are your import paths set up properly? [import]
---
Warning: App.qml:35:12: Unqualified access [unqualified]
width: Constants.width
^^^^^^^^^
Warning: App.qml:35:12: Could not compile binding for width: Cannot access value for name Constants [compiler]
width: Constants.width
^^^^^^^^^
Warning: App.qml:36:13: Unqualified access [unqualified]
height: Constants.height
^^^^^^^^^
Warning: App.qml:36:13: Could not compile binding for height: Cannot access value for name Constants [compiler]
height: Constants.height
^^^^^^^^^
[46/90 27.4/sec] Generating .rcc/qmlcache/content_Screen01.ui_qml.cpp
Warning: Screen01.ui.qml:2:1: Warnings occurred while importing module "QtQuick.Controls": [import]
import QtQuick.Controls
^^^^^^
---
Warning: QtQuick.Controls uses optional imports which are not supported. Some types might not be found. [import]
---
Warning: Screen01.ui.qml:3:1: Warnings occurred while importing module "Loginui1": [import]
import Loginui1
^^^^^^
---
Warning: Failed to import Loginui1. Are your import paths set up properly? [import]
---
Warning: Screen01.ui.qml:36:5: EntryField was not found. Did you add all import paths? [import]
EntryField {
^^^^^^^^^^
...
Solution
Many of these can be quickly fixed by adding the following line to the top-level CMakeLists.txt file:
set(QT_QML_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/qml)
set(QML_IMPORT_PATH ${QT_QML_OUTPUT_DIRECTORY}
CACHE STRING "Import paths for Qt Creator's code model"
FORCE
)
See also https://www.qt.io/blog/compiling-qml-to-c-qtquick-controls-and-optional-imports regarding the warning about "import QtQuick.Controls".
However, several other warnings remain and should be fixed.
Attachments
Issue Links
- is covered by
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QTBUG-110934 Make our published QML code as free of compiler errors/warnings as possible
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- Reported
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