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cxx-qt-gen: add support for choosing a custom parent class
This then allows you to create a QQuickItem such as a QQuickPaintedItem. Closes #474
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| // SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]> | ||
| // SPDX-FileContributor: Andrew Hayzen <[email protected]> | ||
| // | ||
| // SPDX-License-Identifier: MIT OR Apache-2.0 | ||
| import QtQuick 2.12 | ||
| import QtQuick.Controls 2.12 | ||
| import QtQuick.Layouts 1.12 | ||
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| import com.kdab.cxx_qt.demo 1.0 | ||
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| Page { | ||
| header: ToolBar { | ||
| RowLayout { | ||
| anchors.fill: parent | ||
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| ToolButton { | ||
| text: qsTr("Red") | ||
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| onClicked: customPainter.color = "red" | ||
| } | ||
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| ToolButton { | ||
| text: qsTr("Green") | ||
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| onClicked: customPainter.color = "green" | ||
| } | ||
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| ToolButton { | ||
| text: qsTr("Blue") | ||
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| onClicked: customPainter.color = "blue" | ||
| } | ||
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| Item { | ||
| Layout.fillWidth: true | ||
| } | ||
| } | ||
| } | ||
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| ColumnLayout { | ||
| anchors.left: parent.left | ||
| anchors.right: parent.right | ||
| anchors.verticalCenter: parent.verticalCenter | ||
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| CustomParentClass { | ||
| id: customPainter | ||
| color: "red" | ||
| Layout.alignment: Qt.AlignHCenter | ||
| height: 200 | ||
| width: 200 | ||
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| // TODO: once we can connect to signals on the Rust side, this could be done there | ||
| onColorChanged: update() | ||
| } | ||
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| Label { | ||
| Layout.fillWidth: true | ||
| horizontalAlignment: Text.AlignHCenter | ||
| text: qsTr("In this demo the Rectangle is rendered in Rust by implementing a QQuickPaintedItem.") | ||
| wrapMode: Text.Wrap | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| // SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]> | ||
| // SPDX-FileContributor: Andrew Hayzen <[email protected]> | ||
| // | ||
| // SPDX-License-Identifier: MIT OR Apache-2.0 | ||
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| #[cxx_qt::bridge(cxx_file_stem = "custom_parent_class")] | ||
| mod ffi { | ||
| unsafe extern "C++" { | ||
| include!(<QtQuick/QQuickPaintedItem>); | ||
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| type QColor = cxx_qt_lib::QColor; | ||
| include!("cxx-qt-lib/qcolor.h"); | ||
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| type QRectF = cxx_qt_lib::QRectF; | ||
| include!("cxx-qt-lib/qrectf.h"); | ||
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| type QSizeF = cxx_qt_lib::QSizeF; | ||
| include!("cxx-qt-lib/qsizef.h"); | ||
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| // Define the API from QPainter that we need | ||
| type QPainter; | ||
| include!(<QtGui/QPainter>); | ||
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| #[rust_name = "fill_rect"] | ||
| fn fillRect(self: Pin<&mut QPainter>, rectangle: &QRectF, color: &QColor); | ||
| } | ||
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| #[cxx_qt::qobject( | ||
| base = "QQuickPaintedItem", | ||
| parent = "QQuickItem", | ||
| qml_uri = "com.kdab.cxx_qt.demo", | ||
| qml_version = "1.0" | ||
| )] | ||
| #[derive(Default)] | ||
| pub struct CustomParentClass { | ||
| #[qproperty] | ||
| color: QColor, | ||
| } | ||
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| // Define that we need to inherit size() from the base class | ||
| #[cxx_qt::inherit] | ||
| unsafe extern "C++" { | ||
| fn size(self: &qobject::CustomParentClass) -> QSizeF; | ||
| } | ||
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| impl qobject::CustomParentClass { | ||
| #[qinvokable(cxx_override)] | ||
| pub fn paint(self: Pin<&mut Self>, painter: *mut QPainter) { | ||
| // We need to convert the *mut QPainter to a Pin<&mut QPainter> so that we can reach the methods | ||
| if let Some(painter) = unsafe { painter.as_mut() } { | ||
| let mut pinned_painter = unsafe { Pin::new_unchecked(painter) }; | ||
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| // Now pinned painter can be used as normal | ||
| // to render a rectangle with two colours | ||
| let size = self.as_ref().size(); | ||
| pinned_painter.as_mut().fill_rect( | ||
| &QRectF::new(0.0, 0.0, size.width() / 2.0, size.height()), | ||
| self.as_ref().color(), | ||
| ); | ||
| let darker_color = self.as_ref().color().darker(150); | ||
| pinned_painter.as_mut().fill_rect( | ||
| &QRectF::new(size.width() / 2.0, 0.0, size.width() / 2.0, size.height()), | ||
| &darker_color, | ||
| ); | ||
| } | ||
| } | ||
| } | ||
| } |
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