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README_win32.md

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FramelessHelper (Win32 version)

Screenshots

Quick_Acrylic_Win7

Features

  • Frameless but have frame shadow.
  • Draggable and resizable.
  • Automatically high DPI scaling.
  • Multi-monitor support (different resolution and DPI).
  • Have animations when minimizing, maximizing and restoring.
  • Support tiled and stack windows by DWM.
  • Won't cover the task bar when maximized.
  • Won't block the auto-hide task bar when maximized.

Usage

QWidget widget;
// Qt's internal function. Make sure it's a top level window.
widget.createWinId();
// Do this before the widget is shown.
WinNativeEventFilter::addFramelessWindow(widget.windowHandle());
widget.show();

Please refer to the QWidget example for more detailed information.

Some details

QWindow *win = widget.windowHandle();
// All the following values should not be DPI-aware, just use the
// original numbers, assuming the scale factor is 1.0, don't scale
// them yourself, this code will do the scaling according to DPI
// internally and automatically.
// Maximum window size
win->setMaximumSize(1280, 720);
// Minimum window size
win->setMinimumSize(800, 540);
// The **POINTER** of a QWidget or QQuickItem
WinNativeEventFilter::setHitTestVisibleInChrome(win, ui->minimizeBtn, true);
// The frameless window is resizable by default.
win->setFlag(Qt::MSWindowsFixedSizeDialogHint);

IMPORTANT NOTES

  • For QDockWidget, it supports set a custom title bar widget officially, no need to use this library, and this library is known to be not working well for QDockWidgets. Please refer to https://doc.qt.io/qt-6/qdockwidget.html#setTitleBarWidget for more details.
  • Only top level windows (QWindow and QWidget) are supported.
  • There are some known issues when DWM composition is disabled. This is unsupported and not tested and will not be fixed. However, PRs are always welcome.
  • High DPI scaling must be enabled for your application otherwise some Win32 APIs may return wrong value and thus it may result in unexpected behavior.

Supported Platforms

Windows 7 ~ 10, 32 bit & 64 bit.

The code itself should be able to work on Windows Vista in theory, but Qt5 has dropped Vista support long time ago. And Qt6 will only support Win10.

Requirements

Component Requirement Additional Information
Qt >= 5.6 Only the core and gui modules are required
Compiler >= C++11 MSVC, MinGW, Clang-CL, Intel-CL or cross compile from Linux are all supported

Known Bugs

Please refer to https://github.com/wangwenx190/framelesshelper/issues for more information.

Notes for developers

  • As you may have found, if you use this code, the resize areas will be inside the frameless window, however, a normal Win32 window can be resized outside of it. Here is the reason: the WS_THICKFRAME window style will cause a window has three transparent areas beside the window's left, right and bottom edge. Their width/height is 8px if the window is not scaled. In most cases, they are totally invisible. It's DWM's responsibility to draw and control them. They exist to let the user resize the window, visually outside of it. They are in the window area, but not the client area, so they are in the non-client area actually. But we have turned the whole window area into client area in WM_NCCALCSIZE, so the three transparent resize areas also become a part of the client area and thus they become visible. When we resize the window, it looks like we are resizing inside of it, however, that's because the transparent resize areas are visible now, we ARE resizing outside of the window actually. But I don't know how to make them become transparent again without breaking the frame shadow drawn by DWM. If you really want to solve it, you can try to embed your window into a larger transparent window and draw the frame shadow yourself. See the discussions here for more detailed information.
  • All traditional Win32 APIs are replaced by their DPI-aware ones, if there is one.
  • Starting from Windows 10, normal windows usually have a one pixel width border line. After many times of trying, I still can't preserve it if I want to remove the window frame. I don't know how to solve this currently. If you really need it, you have to draw one manually by yourself. See the discussions here for more detailed information.
  • The frame shadow will get lost if the window is totally transparent. It can't be solved unless you draw the frame shadow manually.
  • On Windows 7, if you disabled the Windows Aero, the frame shadow will be disabled as well because it's DWM's resposibility to draw the frame shadow.
  • The border width (8px if not scaled), border height (8px if not scaled) and titlebar height (31px if not scaled) are acquired by Win32 APIs and are the same with other standard windows, and thus you should not modify them. Only modify them when you really have a good reason to do so.
  • You can also copy all the code to QWidget::nativeEvent() or QWindow::nativeEvent(), it's the same with install a native event filter to the application.

References for developers

System Metrics

System Metrics for DPI

Microsoft Docs

Windows Presentation Foundation (WPF)

Chromium

Mozilla Firefox

Microsoft Terminal

GitHub

Qt

窗口样式的作用

WS_OVERLAPPEDWINDOW = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX

WS_OVERLAPPEDWINDOW代表了一个正常的Win32窗口，也就是说，它就是正常窗口默认的窗口样式（Window style）。

WS_OVERLAPPED：窗口有标题栏和边界（功能性，并不是真的要有可视化的东西）；WS_CAPTION：窗口有标题栏功能（并不是真的要有个可视化的标题栏，而是拥有和DWM交互的能力）；WS_SYSMENU：窗口可以弹出系统菜单（ALT+空格）；WS_THICKFRAME：窗口有三个不可视的拖拽区域（前提是非客户区存在），并且拥有DWM绘制的边框阴影（没有这个样式，DWM一定不会绘制边框阴影，只要有，就一定是自绘的）；WS_MINIMIZEBOX：窗口支持最小化（与WS_THICKFRAME一起使用时最小化有动画）；WS_MAXIMIZEBOX：窗口支持最大化（与WS_THICKFRAME一起使用时最大化有动画）。

这些窗口样式，只有WS_SYSMENU是可以没有的（虽然这样会导致窗口无法弹出系统菜单，但如果非要做，也是能用其他API模拟的，比如火狐和Chrome浏览器的做法），如果缺少其他窗口样式，会导致窗口的正常功能产生残缺，比如最大化最小化时的动画丢失，缺少窗口阴影等。

参考资料：https://docs.microsoft.com/en-us/windows/win32/winmsg/window-styles

Special Thanks

Thanks Lucas for testing this code in many various conditions.

Thanks Shujaat Ali Khan for searching so many useful articles and repositories for me.

Thanks Julien Maille for adding the QMainWindow example.

License

MIT License

Copyright (C) 2021 by wangwenx190 (Yuhang Zhao)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.