The default size cannot be set when creating a Webview directly.

[HKMV]

Use Webview wv = new Webview(true, 800, 600); create Webview;
You will see that the window changes from small to large, instead of being 800x600 when it appears.

Looking at the source code, I found that Webview(true, 800, 600) only calls the setSize method internally, and does not set the initial size.

How do I set the default size during initialization?

OS：Windows11
JDK: OpenJDK21

[isinvon]

我遇到了同样的问题，在创建Webview实例并且执行setSize()的时候会发生动画过渡不太流畅的窗口尺寸变化。

后来我发现作者的主页 fork 了一个仓库 https://github.com/e3ndr/webview-nightly-build-fork
这个项目的script文件夹中有脚本可以生成dll文件，可以通过修改webview.h来生成目标webview.dll和WebView2Loader.dll

在 https://github.com/e3ndr/webview-nightly-build-fork/blob/build-latest-commit/webview.h 这个文件中有一处代码为：

constexpr const int initial_width = 640;
constexpr const int initial_height = 480;
set_size(initial_width, initial_height, WEBVIEW_HINT_NONE);

刚好经过我测试640x480就是webview_java这个项目创建窗口时默认的尺寸，但是由于我对C/C++语言不太熟悉，能力有限。如果能够办法将下面这部分代码中的 initial_width 和 initial_height 通过Java程序调用webview的时候传进来，应该是可以避免你说的这个问题的。

set_size(initial_width, initial_height, WEBVIEW_HINT_NONE);

[HKMV]

@isinvon 感谢，我略微有些了解，我抽空看下

[HKMV]

@isinvon 你好，我这边已做适配，在我电脑上测试已经可以。java项目中暂时只提交了win下x86_64的类库，后面再补全其他的。

webview: https://github.com/HKMV/webview-nightly-build-fork
webview_java: https://github.com/HKMV/webview_java

[isinvon]

@HKMV 测试完美，真是太感谢您了！！！！

[NotJustAnna]

Can confirm, NotJustAnna/webview fixes behavior highlighted by this issue and issue #34.

2025-04-16.08-51-03.mp4

[HKMV]

Can confirm, NotJustAnna/webview fixes behavior highlighted by this issue and issue #34.

I have fixed this problem above, you can take it as a reference, my repair is as follows:
webview: https://github.com/HKMV/webview-nightly-build-fork
webview_java: https://github.com/HKMV/webview_java https://github.com/user-attachments/assets/8bd08163-d21f-4ea1-a262-560c3852800c

[NotJustAnna]

Can confirm, NotJustAnna/webview fixes behavior highlighted by this issue and issue #34.

I have fixed this problem above, you can take it as a reference, my repair is as follows: webview: https://github.com/HKMV/webview-nightly-build-fork webview_java: https://github.com/HKMV/webview_java https://github.com/user-attachments/assets/8bd08163-d21f-4ea1-a262-560c3852800c

The fix was made mostly by being on the main repository, as SteffenL highlighted here: webview/webview#1296 (comment)

I believe the following PRs were meant to fix the issue described by webview/webview_java#30:

• Fix default size glitch and refactor webkitgtk #1269
• Fix window rendering glitch and refactor win32 edge #1270
• Fix no-show window issue and refactor cocoa webkit #1271

These PRs introduced dispatch_size_default() less than a month ago.

The fix on my fork was just removing the setSize() call made by webview_java and updating binaries to run on the latest commit.