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Slint is a declarative GUI toolkit to build native user interfaces for Rust, C++, or JavaScript apps.
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thread 'main' panicked at 'Constant property being changed ' #1233

Closed TobiasFella closed 2 years ago

TobiasFella commented 2 years ago

Hi, when running the following code, the app crashes instantly: app.slint: (The exact image doesn't seem to matter, happens for any image as long as it exists)

import { ListView } from "std-widgets.slint";

App := Window {
    preferred-width: 100px;
    preferred-height: 600px;

    ListView {
        for item in [
            {}, {},
        ] : Rectangle {
            drop-shadow-blur: 5px;
            HorizontalLayout {
                Image {
                    source: @image-url("/usr/share/icons/breeze/apps/48/kate.svg");
                }
            }
        }
    }
}

build.rs:

fn main() {
    slint_build::compile("app.slint").unwrap();
}

main.rs:

slint::include_modules!();

fn main() {
    let app = App::new();
    app.run();
}

Cargo.toml:

[package]
name = "test"
version = "0.1.0"
edition = "2021"

[dependencies]
slint = "0.2"

[build-dependencies]
slint-build = "0.2.2"

Backtrace:

❯ cargo run
   Compiling test v0.1.0 (/home/tobias/rei)
    Finished dev [unoptimized + debuginfo] target(s) in 9.80s
     Running `target/debug/test`
thread 'main' panicked at 'Constant property being changed ', /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:614:13
stack backtrace:
   0: rust_begin_unwind
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/std/src/panicking.rs:584:5
   1: core::panicking::panic_fmt
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/panicking.rs:143:14
   2: i_slint_core::properties::PropertyHandle::mark_dirty
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:614:13
   3: i_slint_core::properties::Property<T>::set
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:824:13
   4: <test::slint_generatedApp::InnerComponent__shadow_5 as i_slint_core::model::RepeatedComponent>::listview_layout
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:663:14
   5: i_slint_core::model::Repeater<C>::compute_layout_listview
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/model.rs:1060:17
   6: i_slint_core::model::Repeater<C>::ensure_updated_listview::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/model.rs:919:31
   7: i_slint_core::properties::CURRENT_BINDING::<impl i_slint_core::properties::CURRENT_BINDING>::set
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-hkt-0.1.2/src/lib.rs:264:25
   8: i_slint_core::properties::PropertyTracker<ChangeHandler>::evaluate_as_dependency_root
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:2159:17
   9: i_slint_core::properties::PropertyTracker<ChangeHandler>::evaluate_if_dirty::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:2168:33
  10: core::bool::<impl bool>::then
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/bool.rs:43:24
  11: i_slint_core::properties::PropertyTracker<ChangeHandler>::evaluate_if_dirty
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:2168:9
  12: i_slint_core::model::Repeater<C>::ensure_updated_listview
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/model.rs:853:32
  13: test::slint_generatedApp::InnerApp::visit_dynamic_children
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:245:22
  14: <test::slint_generatedApp::InnerApp as i_slint_core::component::Component_vtable_mod::Component>::visit_children_item::visit_dynamic
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:732:18
  15: core::ops::function::Fn::call
             at /rustc/7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c/library/core/src/ops/function.rs:70:5
  16: i_slint_core::item_tree::visit_item_tree::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:738:21
  17: i_slint_core::item_tree::visit_item_tree
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:757:45
  18: <test::slint_generatedApp::InnerApp as i_slint_core::component::Component_vtable_mod::Component>::visit_children_item
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:730:21
  19: test::slint_generatedApp::InnerApp::item_array::VT::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  20: i_slint_core::component::Component_vtable_mod::ComponentTO::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  21: i_slint_core::item_rendering::render_item_children
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:146:5
  22: i_slint_core::item_rendering::render_item_children::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:140:17
  23: i_slint_core::item_tree::<impl i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitor for T>::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:614:9
  24: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorVTable::new::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  25: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorTO::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  26: i_slint_core::item_tree::visit_item_tree::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:734:17
  27: i_slint_core::item_tree::visit_item_tree
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:757:45
  28: <test::slint_generatedApp::InnerApp as i_slint_core::component::Component_vtable_mod::Component>::visit_children_item
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:730:21
  29: test::slint_generatedApp::InnerApp::item_array::VT::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  30: i_slint_core::component::Component_vtable_mod::ComponentTO::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  31: i_slint_core::item_rendering::render_item_children
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:146:5
  32: i_slint_core::item_rendering::render_item_children::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:140:17
  33: i_slint_core::item_tree::<impl i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitor for T>::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:614:9
  34: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorVTable::new::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  35: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorTO::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  36: i_slint_core::item_tree::visit_item_tree::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:734:17
  37: i_slint_core::item_tree::visit_item_tree
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:757:45
  38: <test::slint_generatedApp::InnerApp as i_slint_core::component::Component_vtable_mod::Component>::visit_children_item
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:730:21
  39: test::slint_generatedApp::InnerApp::item_array::VT::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  40: i_slint_core::component::Component_vtable_mod::ComponentTO::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  41: i_slint_core::item_rendering::render_item_children
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:146:5
  42: i_slint_core::item_rendering::render_item_children::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:140:17
  43: i_slint_core::item_tree::<impl i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitor for T>::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:614:9
  44: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorVTable::new::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  45: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorTO::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  46: i_slint_core::item_tree::visit_item_tree::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:734:17
  47: i_slint_core::item_tree::visit_item_tree
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:757:45
  48: <test::slint_generatedApp::InnerApp as i_slint_core::component::Component_vtable_mod::Component>::visit_children_item
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:730:21
  49: test::slint_generatedApp::InnerApp::item_array::VT::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  50: i_slint_core::component::Component_vtable_mod::ComponentTO::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  51: i_slint_core::item_rendering::render_item_children
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:146:5
  52: i_slint_core::item_rendering::render_item_children::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:140:17
  53: i_slint_core::item_tree::<impl i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitor for T>::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:614:9
  54: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorVTable::new::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  55: i_slint_core::item_tree::ItemVisitor_vtable_mod::ItemVisitorTO::visit_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:585:1
  56: i_slint_core::item_tree::visit_item_tree::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:734:17
  57: i_slint_core::item_tree::visit_item_tree
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_tree.rs:748:9
  58: <test::slint_generatedApp::InnerApp as i_slint_core::component::Component_vtable_mod::Component>::visit_children_item
             at ./target/debug/build/test-876d0c9b55bd521e/out/rei.rs:730:21
  59: test::slint_generatedApp::InnerApp::item_array::VT::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  60: i_slint_core::component::Component_vtable_mod::ComponentTO::visit_children_item
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/component.rs:27:1
  61: i_slint_core::item_rendering::render_item_children
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:146:5
  62: i_slint_core::item_rendering::render_component_items
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/item_rendering.rs:163:5
  63: i_slint_backend_qt::qt_window::QtWindow::paint_event::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-backend-qt-0.2.2/qt_window.rs:1304:17
  64: i_slint_core::window::Window::draw_contents::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/window.rs:515:17
  65: i_slint_core::properties::CURRENT_BINDING::<impl i_slint_core::properties::CURRENT_BINDING>::set
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-hkt-0.1.2/src/lib.rs:264:25
  66: i_slint_core::properties::PropertyTracker<ChangeHandler>::evaluate_as_dependency_root
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/properties.rs:2159:17
  67: i_slint_core::window::Window::draw_contents
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-core-0.2.2/window.rs:520:13
  68: i_slint_backend_qt::qt_window::QtWindow::paint_event
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-backend-qt-0.2.2/qt_window.rs:1292:9
  69: i_slint_backend_qt::qt_window::Slint_paintEvent::{{closure}}
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-backend-qt-0.2.2/qt_window.rs:89:17
  70: Slint_paintEvent
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/cpp-0.5.7/src/lib.rs:254:27
  71: _ZN11SlintWidget10paintEventEP11QPaintEvent
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-backend-qt-0.2.2/qt_window.rs:88:139
  72: _ZN7QWidget5eventEP6QEvent
  73: _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent
  74: _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent
  75: _ZN14QWidgetPrivate14sendPaintEventERK7QRegion
  76: _ZN14QWidgetPrivate10drawWidgetEP12QPaintDeviceRK7QRegionRK6QPoint6QFlagsINS_14DrawWidgetFlagEEP8QPainterP21QWidgetRepaintManager
  77: <unknown>
  78: <unknown>
  79: <unknown>
  80: _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent
  81: _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent
  82: _ZN22QGuiApplicationPrivate18processExposeEventEPN29QWindowSystemInterfacePrivate11ExposeEventE
  83: _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
  84: <unknown>
  85: g_main_dispatch
             at /usr/src/debug/glib2-2.72.0-2.fc36.x86_64/redhat-linux-build/../glib/gmain.c:3417:28
  86: g_main_context_dispatch
             at /usr/src/debug/glib2-2.72.0-2.fc36.x86_64/redhat-linux-build/../glib/gmain.c:4135:7
  87: g_main_context_iterate.constprop.0
             at /usr/src/debug/glib2-2.72.0-2.fc36.x86_64/redhat-linux-build/../glib/gmain.c:4211:5
  88: g_main_context_iteration
             at /usr/src/debug/glib2-2.72.0-2.fc36.x86_64/redhat-linux-build/../glib/gmain.c:4276:12
  89: _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
  90: _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE
  91: _ZN16QCoreApplication4execEv
  92: __cpp_closure_1553422644876351010
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-backend-qt-0.2.2/lib.rs:164:27
  93: <i_slint_backend_qt::Backend as i_slint_core::backend::Backend>::run_event_loop
             at /home/tobias/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-backend-qt-0.2.2/lib.rs:161:13
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
QPainter::end: Painter ended with 6 saved states
Qt has caught an exception thrown from an event handler. Throwing
exceptions from an event handler is not supported in Qt.
You must not let any exception whatsoever propagate through Qt code.
ogoffart commented 2 years ago

Thanks for the bug report. Fixing with https://github.com/slint-ui/slint/pull/1238