Add Go binding (#1)
* Merge LICENSE files of this repo and core library's repo * Remove myself from LICENSE I haven't made any noteworthy contributions to the Go bindings. * Add Go bindings * Add content to README * Fix Go docs URL and add reference to core library
This commit is contained in:
parent
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commit
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name: CI Pipeline
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on: [push, pull_request]
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jobs:
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build:
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strategy:
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matrix:
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image:
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- macos-latest
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- ubuntu-latest
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- windows-latest
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runs-on: ${{ matrix.image }}
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steps:
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- uses: actions/checkout@v3
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- name: Install dependencies
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if: runner.os == 'Linux'
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run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.0-dev
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- name: Build examples
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run: go build ./examples/basic ./examples/bind
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- name: Run tests
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run: go test
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1
LICENSE
1
LICENSE
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@ -1,5 +1,6 @@
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MIT License
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MIT License
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Copyright (c) 2017 Serge Zaitsev
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Copyright (c) 2020 webview
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Copyright (c) 2020 webview
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Permission is hereby granted, free of charge, to any person obtaining a copy
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Permission is hereby granted, free of charge, to any person obtaining a copy
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49
README.md
49
README.md
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# webview_go
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# webview_go
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For the foreseeable future, golang bindings for webview_core will be maintained in https://github.com/webview/webview
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[![GoDoc](https://godoc.org/github.com/webview/webview_go?status.svg)](https://godoc.org/github.com/webview/webview_go)
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[![Go Report Card](https://goreportcard.com/badge/github.com/webview/webview_go)](https://goreportcard.com/report/github.com/webview/webview_go)
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Go language binding for the [webview library][webview].
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> [!NOTE]
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> Versions <= 0.1.1 are available in the [old repository][webview].
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### Getting Started
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See [Go package documentation][go-docs] for the Go API documentation, or simply read the source code.
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Start with creating a new directory structure for your project.
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```sh
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mkdir my-project && cd my-project
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```
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Create a new Go module.
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```sh
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go mod init example.com/app
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```
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Save one of the example programs into your project directory.
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```sh
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curl -sSLo main.go "https://raw.githubusercontent.com/webview/webview_go/master/examples/basic/main.go"
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```
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Install dependencies.
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```sh
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go get github.com/webview/webview_go
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```
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Build the example. On Windows, add `-ldflags="-H windowsgui"` to the command line.
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```sh
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go build
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```
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### Notes
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Calling `Eval()` or `Dispatch()` before `Run()` does not work because the webview instance has only been configured and not yet started.
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[go-docs]: https://pkg.go.dev/github.com/webview/webview_go
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[webview]: https://github.com/webview/webview
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package main
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import webview "github.com/webview/webview_go"
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func main() {
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w := webview.New(false)
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defer w.Destroy()
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w.SetTitle("Basic Example")
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w.SetSize(480, 320, webview.HintNone)
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w.SetHtml("Thanks for using webview!")
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w.Run()
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}
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package main
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import webview "github.com/webview/webview_go"
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const html = `<button id="increment">Tap me</button>
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<div>You tapped <span id="count">0</span> time(s).</div>
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<script>
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const [incrementElement, countElement] =
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document.querySelectorAll("#increment, #count");
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document.addEventListener("DOMContentLoaded", () => {
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incrementElement.addEventListener("click", () => {
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window.increment().then(result => {
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countElement.textContent = result.count;
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});
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});
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});
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</script>`
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type IncrementResult struct {
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Count uint `json:"count"`
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}
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func main() {
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var count uint = 0
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w := webview.New(false)
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defer w.Destroy()
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w.SetTitle("Bind Example")
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w.SetSize(480, 320, webview.HintNone)
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// A binding that increments a value and immediately returns the new value.
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w.Bind("increment", func() IncrementResult {
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count++
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return IncrementResult{Count: count}
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})
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w.SetHtml(html)
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w.Run()
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}
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#include "webview.h"
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#include <stdlib.h>
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#include <stdint.h>
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struct binding_context {
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webview_t w;
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uintptr_t index;
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};
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void _webviewDispatchGoCallback(void *);
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void _webviewBindingGoCallback(webview_t, char *, char *, uintptr_t);
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static void _webview_dispatch_cb(webview_t w, void *arg) {
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_webviewDispatchGoCallback(arg);
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}
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static void _webview_binding_cb(const char *id, const char *req, void *arg) {
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struct binding_context *ctx = (struct binding_context *) arg;
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_webviewBindingGoCallback(ctx->w, (char *)id, (char *)req, ctx->index);
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}
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void CgoWebViewDispatch(webview_t w, uintptr_t arg) {
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webview_dispatch(w, _webview_dispatch_cb, (void *)arg);
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}
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void CgoWebViewBind(webview_t w, const char *name, uintptr_t index) {
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struct binding_context *ctx = calloc(1, sizeof(struct binding_context));
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ctx->w = w;
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ctx->index = index;
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webview_bind(w, name, _webview_binding_cb, (void *)ctx);
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}
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Copyright (C) Microsoft Corporation. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* The name of Microsoft Corporation, or the names of its contributors
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may not be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Load Diff
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1.0.1150.38
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@ -0,0 +1,22 @@
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MIT License
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Copyright (c) 2017 Serge Zaitsev
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Copyright (c) 2022 Steffen André Langnes
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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Load Diff
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6b2747222f14265ced7af5fa13e6f16d43a55325
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#include "webview.h"
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package webview
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/*
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#cgo CFLAGS: -I${SRCDIR}/libs/webview/include
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#cgo CXXFLAGS: -I${SRCDIR}/libs/webview/include
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#cgo linux openbsd freebsd netbsd CXXFLAGS: -DWEBVIEW_GTK -std=c++11
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#cgo linux openbsd freebsd netbsd pkg-config: gtk+-3.0 webkit2gtk-4.0
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#cgo darwin CXXFLAGS: -DWEBVIEW_COCOA -std=c++11
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#cgo darwin LDFLAGS: -framework WebKit
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#cgo windows CXXFLAGS: -DWEBVIEW_EDGE -std=c++14 -I${SRCDIR}/libs/mswebview2/include
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#cgo windows LDFLAGS: -static -ladvapi32 -lole32 -lshell32 -lshlwapi -luser32 -lversion
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#include "webview.h"
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#include <stdlib.h>
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#include <stdint.h>
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void CgoWebViewDispatch(webview_t w, uintptr_t arg);
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void CgoWebViewBind(webview_t w, const char *name, uintptr_t index);
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*/
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import "C"
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import (
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"encoding/json"
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"errors"
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"reflect"
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"runtime"
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"sync"
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"unsafe"
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)
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func init() {
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// Ensure that main.main is called from the main thread
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runtime.LockOSThread()
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}
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// Hints are used to configure window sizing and resizing
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type Hint int
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const (
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// Width and height are default size
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HintNone = C.WEBVIEW_HINT_NONE
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// Window size can not be changed by a user
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HintFixed = C.WEBVIEW_HINT_FIXED
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// Width and height are minimum bounds
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HintMin = C.WEBVIEW_HINT_MIN
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// Width and height are maximum bounds
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HintMax = C.WEBVIEW_HINT_MAX
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)
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type WebView interface {
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// Run runs the main loop until it's terminated. After this function exits -
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// you must destroy the webview.
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Run()
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// Terminate stops the main loop. It is safe to call this function from
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// a background thread.
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Terminate()
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// Dispatch posts a function to be executed on the main thread. You normally
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// do not need to call this function, unless you want to tweak the native
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// window.
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Dispatch(f func())
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// Destroy destroys a webview and closes the native window.
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Destroy()
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// Window returns a native window handle pointer. When using GTK backend the
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// pointer is GtkWindow pointer, when using Cocoa backend the pointer is
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// NSWindow pointer, when using Win32 backend the pointer is HWND pointer.
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Window() unsafe.Pointer
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// SetTitle updates the title of the native window. Must be called from the UI
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// thread.
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SetTitle(title string)
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// SetSize updates native window size. See Hint constants.
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SetSize(w int, h int, hint Hint)
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// Navigate navigates webview to the given URL. URL may be a properly encoded data.
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// URI. Examples:
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// w.Navigate("https://github.com/webview/webview")
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// w.Navigate("data:text/html,%3Ch1%3EHello%3C%2Fh1%3E")
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// w.Navigate("data:text/html;base64,PGgxPkhlbGxvPC9oMT4=")
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Navigate(url string)
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|
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// SetHtml sets the webview HTML directly.
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// Example: w.SetHtml(w, "<h1>Hello</h1>");
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SetHtml(html string)
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// Init injects JavaScript code at the initialization of the new page. Every
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// time the webview will open a the new page - this initialization code will
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// be executed. It is guaranteed that code is executed before window.onload.
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Init(js string)
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// Eval evaluates arbitrary JavaScript code. Evaluation happens asynchronously,
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// also the result of the expression is ignored. Use RPC bindings if you want
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// to receive notifications about the results of the evaluation.
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Eval(js string)
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|
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// Bind binds a callback function so that it will appear under the given name
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// as a global JavaScript function. Internally it uses webview_init().
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// Callback receives a request string and a user-provided argument pointer.
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// Request string is a JSON array of all the arguments passed to the
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// JavaScript function.
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|
//
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|
// f must be a function
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// f must return either value and error or just error
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Bind(name string, f interface{}) error
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}
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type webview struct {
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w C.webview_t
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}
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var (
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|
m sync.Mutex
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index uintptr
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dispatch = map[uintptr]func(){}
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bindings = map[uintptr]func(id, req string) (interface{}, error){}
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)
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func boolToInt(b bool) C.int {
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if b {
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return 1
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}
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return 0
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}
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// New calls NewWindow to create a new window and a new webview instance. If debug
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// is non-zero - developer tools will be enabled (if the platform supports them).
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func New(debug bool) WebView { return NewWindow(debug, nil) }
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// NewWindow creates a new webview instance. If debug is non-zero - developer
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// tools will be enabled (if the platform supports them). Window parameter can be
|
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// a pointer to the native window handle. If it's non-null - then child WebView is
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// embedded into the given parent window. Otherwise a new window is created.
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// Depending on the platform, a GtkWindow, NSWindow or HWND pointer can be passed
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// here.
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func NewWindow(debug bool, window unsafe.Pointer) WebView {
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|
w := &webview{}
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w.w = C.webview_create(boolToInt(debug), window)
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||||||
|
return w
|
||||||
|
}
|
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|
|
||||||
|
func (w *webview) Destroy() {
|
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|
C.webview_destroy(w.w)
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|
}
|
||||||
|
|
||||||
|
func (w *webview) Run() {
|
||||||
|
C.webview_run(w.w)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) Terminate() {
|
||||||
|
C.webview_terminate(w.w)
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|
}
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|
|
||||||
|
func (w *webview) Window() unsafe.Pointer {
|
||||||
|
return C.webview_get_window(w.w)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) Navigate(url string) {
|
||||||
|
s := C.CString(url)
|
||||||
|
defer C.free(unsafe.Pointer(s))
|
||||||
|
C.webview_navigate(w.w, s)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) SetHtml(html string) {
|
||||||
|
s := C.CString(html)
|
||||||
|
defer C.free(unsafe.Pointer(s))
|
||||||
|
C.webview_set_html(w.w, s)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) SetTitle(title string) {
|
||||||
|
s := C.CString(title)
|
||||||
|
defer C.free(unsafe.Pointer(s))
|
||||||
|
C.webview_set_title(w.w, s)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) SetSize(width int, height int, hint Hint) {
|
||||||
|
C.webview_set_size(w.w, C.int(width), C.int(height), C.int(hint))
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) Init(js string) {
|
||||||
|
s := C.CString(js)
|
||||||
|
defer C.free(unsafe.Pointer(s))
|
||||||
|
C.webview_init(w.w, s)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) Eval(js string) {
|
||||||
|
s := C.CString(js)
|
||||||
|
defer C.free(unsafe.Pointer(s))
|
||||||
|
C.webview_eval(w.w, s)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) Dispatch(f func()) {
|
||||||
|
m.Lock()
|
||||||
|
for ; dispatch[index] != nil; index++ {
|
||||||
|
}
|
||||||
|
dispatch[index] = f
|
||||||
|
m.Unlock()
|
||||||
|
C.CgoWebViewDispatch(w.w, C.uintptr_t(index))
|
||||||
|
}
|
||||||
|
|
||||||
|
//export _webviewDispatchGoCallback
|
||||||
|
func _webviewDispatchGoCallback(index unsafe.Pointer) {
|
||||||
|
m.Lock()
|
||||||
|
f := dispatch[uintptr(index)]
|
||||||
|
delete(dispatch, uintptr(index))
|
||||||
|
m.Unlock()
|
||||||
|
f()
|
||||||
|
}
|
||||||
|
|
||||||
|
//export _webviewBindingGoCallback
|
||||||
|
func _webviewBindingGoCallback(w C.webview_t, id *C.char, req *C.char, index uintptr) {
|
||||||
|
m.Lock()
|
||||||
|
f := bindings[uintptr(index)]
|
||||||
|
m.Unlock()
|
||||||
|
jsString := func(v interface{}) string { b, _ := json.Marshal(v); return string(b) }
|
||||||
|
status, result := 0, ""
|
||||||
|
if res, err := f(C.GoString(id), C.GoString(req)); err != nil {
|
||||||
|
status = -1
|
||||||
|
result = jsString(err.Error())
|
||||||
|
} else if b, err := json.Marshal(res); err != nil {
|
||||||
|
status = -1
|
||||||
|
result = jsString(err.Error())
|
||||||
|
} else {
|
||||||
|
status = 0
|
||||||
|
result = string(b)
|
||||||
|
}
|
||||||
|
s := C.CString(result)
|
||||||
|
defer C.free(unsafe.Pointer(s))
|
||||||
|
C.webview_return(w, id, C.int(status), s)
|
||||||
|
}
|
||||||
|
|
||||||
|
func (w *webview) Bind(name string, f interface{}) error {
|
||||||
|
v := reflect.ValueOf(f)
|
||||||
|
// f must be a function
|
||||||
|
if v.Kind() != reflect.Func {
|
||||||
|
return errors.New("only functions can be bound")
|
||||||
|
}
|
||||||
|
// f must return either value and error or just error
|
||||||
|
if n := v.Type().NumOut(); n > 2 {
|
||||||
|
return errors.New("function may only return a value or a value+error")
|
||||||
|
}
|
||||||
|
|
||||||
|
binding := func(id, req string) (interface{}, error) {
|
||||||
|
raw := []json.RawMessage{}
|
||||||
|
if err := json.Unmarshal([]byte(req), &raw); err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
|
||||||
|
isVariadic := v.Type().IsVariadic()
|
||||||
|
numIn := v.Type().NumIn()
|
||||||
|
if (isVariadic && len(raw) < numIn-1) || (!isVariadic && len(raw) != numIn) {
|
||||||
|
return nil, errors.New("function arguments mismatch")
|
||||||
|
}
|
||||||
|
args := []reflect.Value{}
|
||||||
|
for i := range raw {
|
||||||
|
var arg reflect.Value
|
||||||
|
if isVariadic && i >= numIn-1 {
|
||||||
|
arg = reflect.New(v.Type().In(numIn - 1).Elem())
|
||||||
|
} else {
|
||||||
|
arg = reflect.New(v.Type().In(i))
|
||||||
|
}
|
||||||
|
if err := json.Unmarshal(raw[i], arg.Interface()); err != nil {
|
||||||
|
return nil, err
|
||||||
|
}
|
||||||
|
args = append(args, arg.Elem())
|
||||||
|
}
|
||||||
|
errorType := reflect.TypeOf((*error)(nil)).Elem()
|
||||||
|
res := v.Call(args)
|
||||||
|
switch len(res) {
|
||||||
|
case 0:
|
||||||
|
// No results from the function, just return nil
|
||||||
|
return nil, nil
|
||||||
|
case 1:
|
||||||
|
// One result may be a value, or an error
|
||||||
|
if res[0].Type().Implements(errorType) {
|
||||||
|
if res[0].Interface() != nil {
|
||||||
|
return nil, res[0].Interface().(error)
|
||||||
|
}
|
||||||
|
return nil, nil
|
||||||
|
}
|
||||||
|
return res[0].Interface(), nil
|
||||||
|
case 2:
|
||||||
|
// Two results: first one is value, second is error
|
||||||
|
if !res[1].Type().Implements(errorType) {
|
||||||
|
return nil, errors.New("second return value must be an error")
|
||||||
|
}
|
||||||
|
if res[1].Interface() == nil {
|
||||||
|
return res[0].Interface(), nil
|
||||||
|
}
|
||||||
|
return res[0].Interface(), res[1].Interface().(error)
|
||||||
|
default:
|
||||||
|
return nil, errors.New("unexpected number of return values")
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
m.Lock()
|
||||||
|
for ; bindings[index] != nil; index++ {
|
||||||
|
}
|
||||||
|
bindings[index] = binding
|
||||||
|
m.Unlock()
|
||||||
|
cname := C.CString(name)
|
||||||
|
defer C.free(unsafe.Pointer(cname))
|
||||||
|
C.CgoWebViewBind(w.w, cname, C.uintptr_t(index))
|
||||||
|
return nil
|
||||||
|
}
|
|
@ -0,0 +1,50 @@
|
||||||
|
package webview
|
||||||
|
|
||||||
|
import (
|
||||||
|
"flag"
|
||||||
|
"log"
|
||||||
|
"os"
|
||||||
|
"testing"
|
||||||
|
)
|
||||||
|
|
||||||
|
func Example() {
|
||||||
|
w := New(true)
|
||||||
|
defer w.Destroy()
|
||||||
|
w.SetTitle("Hello")
|
||||||
|
w.Bind("noop", func() string {
|
||||||
|
log.Println("hello")
|
||||||
|
return "hello"
|
||||||
|
})
|
||||||
|
w.Bind("add", func(a, b int) int {
|
||||||
|
return a + b
|
||||||
|
})
|
||||||
|
w.Bind("quit", func() {
|
||||||
|
w.Terminate()
|
||||||
|
})
|
||||||
|
w.SetHtml(`<!doctype html>
|
||||||
|
<html>
|
||||||
|
<body>hello</body>
|
||||||
|
<script>
|
||||||
|
window.onload = function() {
|
||||||
|
document.body.innerText = ` + "`hello, ${navigator.userAgent}`" + `;
|
||||||
|
noop().then(function(res) {
|
||||||
|
console.log('noop res', res);
|
||||||
|
add(1, 2).then(function(res) {
|
||||||
|
console.log('add res', res);
|
||||||
|
quit();
|
||||||
|
});
|
||||||
|
});
|
||||||
|
};
|
||||||
|
</script>
|
||||||
|
</html>
|
||||||
|
)`)
|
||||||
|
w.Run()
|
||||||
|
}
|
||||||
|
|
||||||
|
func TestMain(m *testing.M) {
|
||||||
|
flag.Parse()
|
||||||
|
if testing.Verbose() {
|
||||||
|
Example()
|
||||||
|
}
|
||||||
|
os.Exit(m.Run())
|
||||||
|
}
|
Loading…
Reference in New Issue