~bitfehler/rust_qt_example

2ecef1d9aa322bb6aacb2e8e9cca73a079b96f85 — Conrad Hoffmann 2 years ago master
Initial commit
A  => .gitignore +1 -0
@@ 1,1 @@
/target

A  => Cargo.lock +601 -0
@@ 1,601 @@
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A  => Cargo.toml +15 -0
@@ 1,15 @@
[package]
name = "rust_qt_example"
version = "0.1.0"
edition = "2021"

[dependencies]
cpp_core = "0.6.0"
qt_core = "0.5.0"
qt_gui = "0.5.0"
qt_widgets = "0.5.0"
qt_ui_tools = "0.5.0"
qt_core_custom_events = "0.2.0"

[build-dependencies]
qt_ritual_build = "0.5.0"

A  => README.md +28 -0
@@ 1,28 @@
# Rust Qt example

This is just an example application for how to use the Rust Qt bindings.

It's main intention is to demonstrate three things:

### Custom resources

A custom resource (in this case, a font) is embedded in the executable. Check
out the `fonts/` folder and `build.rs` for details.

### Custom event filter

Usually, one would sub-class a widget to have access to e.g. key events and
such. But sub-classing is not yet supported by ritual, the Rust bindings
generator. Hence, the event filter technique can be used as a workaround.

### Layout

The app uses a common layout, where a text (in this case, an editor, so you
have to type it yourself) is displayed full screen for smaller windows. Above a
certain window width, the text will stay at its maximum width, to maintain
readability. Type (or paste) some text and resize the window to see it in
action.

I'd be interested to see how such a layout would be implemented in GTK. Any
pointers to my [public inbox](mailto:~bitfehler/public-inbox@lists.sr.ht) would
be much appreciated!

A  => build.rs +3 -0
@@ 1,3 @@
fn main() {
    qt_ritual_build::add_resources(concat!(env!("CARGO_MANIFEST_DIR"), "/fonts/resources.qrc"));
}
\ No newline at end of file

A  => fonts/LICENSE_OFL.txt +92 -0
@@ 1,92 @@
This Font Software is licensed under the SIL Open Font License,
Version 1.1.

This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL

-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------

PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font
creation efforts of academic and linguistic communities, and to
provide a free and open framework in which fonts may be shared and
improved in partnership with others.

The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The
fonts, including any derivative works, can be bundled, embedded,
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply to
any document created using the fonts or their derivatives.

DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.

"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).

"Original Version" refers to the collection of Font Software
components as distributed by the Copyright Holder(s).

"Modified Version" refers to any derivative made by adding to,
deleting, or substituting -- in part or in whole -- any of the
components of the Original Version, by changing formats or by porting
the Font Software to a new environment.

"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.

PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Font Software, to use, study, copy, merge, embed,
modify, redistribute, and sell modified and unmodified copies of the
Font Software, subject to the following conditions:

1) Neither the Font Software nor any of its individual components, in
Original or Modified Versions, may be sold by itself.

2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.

3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the
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Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.

5) The Font Software, modified or unmodified, in part or in whole,
must be distributed entirely under this license, and must not be
distributed under any other license. The requirement for fonts to
remain under this license does not apply to any document created using
the Font Software.

TERMINATION
This license becomes null and void if any of the above conditions are
not met.

DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
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DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.

A  => fonts/NotoSansSymbols-Regular.ttf +0 -0
A  => fonts/resources.qrc +5 -0
@@ 1,5 @@
<RCC>
    <qresource prefix="/fonts/">
        <file>NotoSansSymbols-Regular.ttf</file>
    </qresource>
</RCC>

A  => src/main.rs +92 -0
@@ 1,92 @@

use cpp_core::{Ptr, StaticUpcast};
use qt_gui::{QFontDatabase, QKeyEvent};
use qt_core::{qs, q_event, QBox, QEvent, QObject, QFlags, Key, KeyboardModifier};
use qt_widgets::{
    QApplication, QTextEdit, QHBoxLayout, QWidget,
};
use qt_core_custom_events::custom_event_filter::CustomEventFilter;
use std::rc::Rc;
use std::process;

struct Form {
    widget: QBox<QWidget>,
    editor: QBox<QTextEdit>,
    filter: QBox<CustomEventFilter>,
}

impl StaticUpcast<QObject> for Form {
    unsafe fn static_upcast(ptr: Ptr<Self>) -> Ptr<QObject> {
        ptr.widget.as_ptr().static_upcast()
    }
}

fn event_filter(mut obj: &mut QObject, mut ev: &mut QEvent) -> bool {
    unsafe {
        if ev.type_() == q_event::Type::KeyPress {
            let p: Ptr<QEvent> = Ptr::from_raw(ev);
            let ke: Ptr<QKeyEvent> = p.dynamic_cast();
            let mods = ke.modifiers();
            let key = ke.key();

            let only_ctrl = QFlags::from(KeyboardModifier::ControlModifier);

            if mods.to_int() == only_ctrl.to_int() && key == Key::KeyQ.to_int() {
                println!("Kansas is going bye-bye...");
                process::exit(0);
            }
        }
    }
    false
}

impl Form {
    fn new() -> Rc<Form> {
        unsafe {
            let widget = QWidget::new_0a();
            let ws = qs("QWidget {background-color: white;}");
            widget.set_style_sheet(&ws);

            let layout = QHBoxLayout::new_1a(&widget);
            layout.add_stretch_0a();
            
            let r = qs(":/fonts/NotoSansSymbols-Regular.ttf");
            QFontDatabase::add_application_font(&r);
            
            let editor = QTextEdit::new();
            // editor.set_read_only(true);
            
            let p = qs("Type some text, press Ctrl+Q to quit...");
            editor.set_placeholder_text(&p);
            
            editor.set_maximum_width(900);
            editor.set_base_size_2a(900, 900);
            
            let s = qs("QTextEdit {border: 0px solid black; font-family: \"Noto Sans\"; font-size: 40px;}");
            editor.set_style_sheet(&s);

            
            layout.add_widget_2a(&editor, 5);
            layout.add_stretch_0a();
            
            let filter = CustomEventFilter::new(event_filter);
            editor.install_event_filter(&filter);

            widget.show();

            let this = Rc::new(Self {
                widget,
                editor,
                filter,
            });
            this
        }
    }
}

fn main() {
    QApplication::init(|_| unsafe {
        let _form = Form::new();
        QApplication::exec()
    })
}
\ No newline at end of file