2022-10-13 08:39:40 -07:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Raymond Zhao <7199958+rzhao271@users.noreply.github.com>
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Date: Wed, 17 Aug 2022 13:49:40 -0700
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Subject: fix: Adjust caption-removing style call
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There is a SetWindowLong call that removes WS_CAPTION for frameless
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windows, but Electron uses WS_CAPTION even for frameless windows,
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unless they are transparent.
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Changing this call only affects frameless windows, and it fixes
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a visual glitch where they showed a Windows 7 style frame
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during startup.
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The if statement was originally introduced by
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https://codereview.chromium.org/9372053/, and it was there to fix
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a visual glitch with the close button showing up during startup
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or resizing, but Electron does not seem to run into that issue
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for opaque frameless windows even with that block commented out.
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diff --git a/ui/views/win/hwnd_message_handler.cc b/ui/views/win/hwnd_message_handler.cc
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2025-06-30 12:29:54 -04:00
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index 09f317d098bce5621c255e5f2bf420254067db7a..ad5044fbb4b8611a740da34f3f0bfe6dbb416f38 100644
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2022-10-13 08:39:40 -07:00
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--- a/ui/views/win/hwnd_message_handler.cc
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+++ b/ui/views/win/hwnd_message_handler.cc
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2025-06-30 12:29:54 -04:00
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@@ -1802,7 +1802,23 @@ LRESULT HWNDMessageHandler::OnCreate(CREATESTRUCT* create_struct) {
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2022-10-13 08:39:40 -07:00
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SendMessage(hwnd(), WM_CHANGEUISTATE, MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS),
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0);
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- if (!delegate_->HasFrame()) {
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+ LONG is_popup =
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+ GetWindowLong(hwnd(), GWL_STYLE) & static_cast<LONG>(WS_POPUP);
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+
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+ // For transparent windows, Electron removes the WS_CAPTION style,
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+ // so we continue to remove it here. If we didn't, an opaque rectangle
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+ // would show up.
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+ // For non-transparent windows, Electron keeps the WS_CAPTION style,
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+ // so we don't remove it in that case. If we did, a Windows 7 frame
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+ // would show up.
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+ // We also need this block for frameless popup windows. When the user opens
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+ // a dropdown in an Electron app, the internal popup menu from
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+ // third_party/blink/renderer/core/html/forms/internal_popup_menu.h
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+ // is rendered. That menu is actually an HTML page inside of a frameless popup window.
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+ // A new popup window is created every time the user opens the dropdown,
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+ // and this code path is run. The code block below runs SendFrameChanged,
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+ // which gives the dropdown options the proper layout.
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+ if (!delegate_->HasFrame() && (is_translucent_ || is_popup)) {
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SetWindowLong(hwnd(), GWL_STYLE,
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GetWindowLong(hwnd(), GWL_STYLE) & ~WS_CAPTION);
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SendFrameChanged();
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