/*
* 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.
*/
#include "framelesshelper_win32.h"
#include <QtCore/qdebug.h>
#include <QtCore/qvariant.h>
#include <QtCore/qcoreapplication.h>
#include <QtGui/qwindow.h>
#include <QtCore/qt_windows.h>
#include <shellapi.h>
#include "utilities.h"
#ifndef WM_NCUAHDRAWCAPTION
// Not documented, only available since Windows Vista
#define WM_NCUAHDRAWCAPTION 0x00AE
#endif
#ifndef WM_NCUAHDRAWFRAME
// Not documented, only available since Windows Vista
#define WM_NCUAHDRAWFRAME 0x00AF
#endif
#ifndef ABM_GETAUTOHIDEBAREX
// Only available since Windows 8.1
#define ABM_GETAUTOHIDEBAREX 0x0000000b
#endif
#ifndef IsMinimized
// Only available since Windows 2000
#define IsMinimized(h) IsIconic(h)
#endif
#ifndef IsMaximized
// Only available since Windows 2000
#define IsMaximized(h) IsZoomed(h)
#endif
#ifndef GET_X_LPARAM
// Only available since Windows 2000
#define GET_X_LPARAM(lp) ((int) (short) LOWORD(lp))
#endif
#ifndef GET_Y_LPARAM
// Only available since Windows 2000
#define GET_Y_LPARAM(lp) ((int) (short) HIWORD(lp))
#endif
[[nodiscard]] static inline bool shouldHaveWindowFrame()
{
if (Utilities::shouldUseNativeTitleBar()) {
// We have to use the original window frame unconditionally if we
// want to use the native title bar.
return true;
}
const bool should = qEnvironmentVariableIsSet(_flh_global::_flh_preserveNativeFrame_flag);
const bool force = qEnvironmentVariableIsSet(_flh_global::_flh_forcePreserveNativeFrame_flag);
if (should || force) {
if (force) {
return true;
}
if (should) {
// If you preserve the window frame on Win7~8.1,
// the window will have a terrible appearance.
return Utilities::isWin10OrGreater();
}
}
return false;
}
// The thickness of an auto-hide taskbar in pixels.
static const int kAutoHideTaskbarThicknessPx = 2;
static const int kAutoHideTaskbarThicknessPy = kAutoHideTaskbarThicknessPx;
static QScopedPointer<FramelessHelperWin> g_instance;
static inline void setup()
{
if (g_instance.isNull()) {
g_instance.reset(new FramelessHelperWin);
qApp->installNativeEventFilter(g_instance.data());
}
}
static inline void installHelper(QWindow *window, const bool enable)
{
Q_ASSERT(window);
if (!window) {
return;
}
Utilities::updateQtFrameMargins(window, enable);
Utilities::updateFrameMargins(window->winId(), !enable);
Utilities::triggerFrameChange(window->winId());
window->setProperty(_flh_global::_flh_framelessEnabled_flag, enable);
}
FramelessHelperWin::FramelessHelperWin() = default;
FramelessHelperWin::~FramelessHelperWin()
{
if (!g_instance.isNull()) {
qApp->removeNativeEventFilter(g_instance.data());
}
}
void FramelessHelperWin::addFramelessWindow(QWindow *window)
{
Q_ASSERT(window);
if (!window) {
return;
}
setup();
installHelper(window, true);
}
void FramelessHelperWin::removeFramelessWindow(QWindow *window)
{
Q_ASSERT(window);
if (!window) {
return;
}
installHelper(window, false);
}
#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result)
#else
bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *message, long *result)
#endif
{
if ((eventType != QByteArrayLiteral("windows_generic_MSG")) || !message || !result) {
return false;
}
#if (QT_VERSION == QT_VERSION_CHECK(5, 11, 1))
// Work-around a bug caused by typo which only exists in Qt 5.11.1
const auto msg = *reinterpret_cast<MSG **>(message);
#else
const auto msg = static_cast<LPMSG>(message);
#endif
if (!msg->hwnd) {
// Why sometimes the window handle is null? Is it designed to be?
// Anyway, we should skip it in this case.
return false;
}
const QWindow *window = Utilities::findWindow(reinterpret_cast<WId>(msg->hwnd));
if (!window || !window->property(_flh_global::_flh_framelessEnabled_flag).toBool()) {
return false;
}
switch (msg->message) {
case WM_NCCALCSIZE: {
// Windows是根据这个消息的返回值来设置窗口的客户区（窗口中真正显示的内容）
// 和非客户区（标题栏、窗口边框、菜单栏和状态栏等Windows系统自行提供的部分
// ，不过对于Qt来说，除了标题栏和窗口边框，非客户区基本也都是自绘的）的范
// 围的，lParam里存放的就是新客户区的几何区域，默认是整个窗口的大小，正常
// 的程序需要修改这个参数，告知系统窗口的客户区和非客户区的范围（一般来说可
// 以完全交给Windows，让其自行处理，使用默认的客户区和非客户区），因此如果
// 我们不修改lParam，就可以使客户区充满整个窗口，从而去掉标题栏和窗口边框
// （因为这些东西都被客户区给盖住了。但边框阴影也会因此而丢失，不过我们会使
// 用其他方式将其带回，请参考其他消息的处理，此处不过多提及）。但有个情况要
// 特别注意，那就是窗口最大化后，窗口的实际尺寸会比屏幕的尺寸大一点，从而使
// 用户看不到窗口的边界，这样用户就不能在窗口最大化后调整窗口的大小了（虽然
// 这个做法听起来特别奇怪，但Windows确实就是这样做的），因此如果我们要自行
// 处理窗口的非客户区，就要在窗口最大化后，将窗口边框的宽度和高度（一般是相
// 等的）从客户区裁剪掉，否则我们窗口所显示的内容就会超出屏幕边界，显示不全。
// 如果用户开启了任务栏自动隐藏，在窗口最大化后，还要考虑任务栏的位置。因为
// 如果窗口最大化后，其尺寸和屏幕尺寸相等（因为任务栏隐藏了，所以窗口最大化
// 后其实是充满了整个屏幕，变相的全屏了），Windows会认为窗口已经进入全屏的
// 状态，从而导致自动隐藏的任务栏无法弹出。要避免这个状况，就要使窗口的尺寸
// 小于屏幕尺寸。我下面的做法参考了火狐、Chromium和Windows Terminal
// 如果没有开启任务栏自动隐藏，是不存在这个问题的，所以要先进行判断。
// 一般情况下，*result设置为0（相当于DefWindowProc的返回值为0）就可以了，
// 根据MSDN的说法，返回0意为此消息已经被程序自行处理了，让Windows跳过此消
// 息，否则Windows会添加对此消息的默认处理，对于当前这个消息而言，就意味着
// 标题栏和窗口边框又会回来，这当然不是我们想要的结果。根据MSDN，当wParam
// 为FALSE时，只能返回0，但当其为TRUE时，可以返回0，也可以返回一个WVR_常
// 量。根据Chromium的注释，当存在非客户区时，如果返回WVR_REDRAW会导致子
// 窗口/子控件出现奇怪的bug（自绘控件错位），并且Lucas在Windows 10
// 上成功复现，说明这个bug至今都没有解决。我查阅了大量资料，发现唯一的解决
// 方案就是返回0。但如果不存在非客户区，且wParam为TRUE，最好返回
// WVR_REDRAW，否则窗口在调整大小可能会产生严重的闪烁现象。
// 虽然对大多数消息来说，返回0都代表让Windows忽略此消息，但实际上不同消息
// 能接受的返回值是不一样的，请注意自行查阅MSDN。
// Sent when the size and position of a window's client area must be
// calculated. By processing this message, an application can
// control the content of the window's client area when the size or
// position of the window changes. If wParam is TRUE, lParam points
// to an NCCALCSIZE_PARAMS structure that contains information an
// application can use to calculate the new size and position of the
// client rectangle. If wParam is FALSE, lParam points to a RECT
// structure. On entry, the structure contains the proposed window
// rectangle for the window. On exit, the structure should contain
// the screen coordinates of the corresponding window client area.
// The client area is the window's content area, the non-client area
// is the area which is provided by the system, such as the title
// bar, the four window borders, the frame shadow, the menu bar, the
// status bar, the scroll bar, etc. But for Qt, it draws most of the
// window area (client + non-client) itself. We now know that the
// title bar and the window frame is in the non-client area and we
// can set the scope of the client area in this message, so we can
// remove the title bar and the window frame by let the non-client
// area be covered by the client area (because we can't really get
// rid of the non-client area, it will always be there, all we can
// do is to hide it) , which means we should let the client area's
// size the same with the whole window's size. So there is no room
// for the non-client area and then the user won't be able to see it
// again. But how to achieve this? Very easy, just leave lParam (the
// re-calculated client area) untouched. But of course you can
// modify lParam, then the non-client area will be seen and the
// window borders and the window frame will show up. However, things
// are quite different when you try to modify the top margin of the
// client area. DWM will always draw the whole title bar no matter
// what margin value you set for the top, unless you don't modify it
// and remove the whole top area (the title bar + the one pixel
// height window border). This can be confirmed in Windows
// Terminal's source code, you can also try yourself to verify
// it. So things will become quite complicated if you want to
// preserve the four window borders. So we just remove the whole
// window frame, otherwise the code will become much more complex.
if (Utilities::shouldUseNativeTitleBar()) {
break;
}
if (!msg->wParam) {
*result = 0;
return true;
}
bool nonClientAreaExists = false;
const auto clientRect = &(reinterpret_cast<LPNCCALCSIZE_PARAMS>(msg->lParam)->rgrc[0]);
if (shouldHaveWindowFrame()) {
// Store the original top before the default window proc
// applies the default frame.
const LONG originalTop = clientRect->top;
// Apply the default frame
const LRESULT ret = DefWindowProcW(msg->hwnd, WM_NCCALCSIZE, msg->wParam, msg->lParam);
if (ret != 0) {
*result = ret;
return true;
}
// Re-apply the original top from before the size of the
// default frame was applied.
clientRect->top = originalTop;
}
// We don't need this correction when we're fullscreen. We will
// have the WS_POPUP size, so we don't have to worry about
// borders, and the default frame will be fine.
if (IsMaximized(msg->hwnd) && (window->windowState() != Qt::WindowFullScreen)) {
// Windows automatically adds a standard width border to all
// sides when a window is maximized. We have to remove it
// otherwise the content of our window will be cut-off from
// the screen.
// The value of border width and border height should be
// identical in most cases, when the scale factor is 1.0, it
// should be eight pixels.
const int rbh = getSystemMetric(window, Utilities::SystemMetric::ResizeBorderHeight, true);
clientRect->top += rbh;
if (!shouldHaveWindowFrame()) {
clientRect->bottom -= rbh;
const int rbw = getSystemMetric(window, Utilities::SystemMetric::ResizeBorderWidth, true);
clientRect->left += rbw;
clientRect->right -= rbw;
}
nonClientAreaExists = true;
}
// Attempt to detect if there's an autohide taskbar, and if
// there is, reduce our size a bit on the side with the taskbar,
// so the user can still mouse-over the taskbar to reveal it.
// Make sure to use MONITOR_DEFAULTTONEAREST, so that this will
// still find the right monitor even when we're restoring from
// minimized.
if (IsMaximized(msg->hwnd)) {
APPBARDATA abd;
SecureZeroMemory(&abd, sizeof(abd));
abd.cbSize = sizeof(abd);
const UINT taskbarState = SHAppBarMessage(ABM_GETSTATE, &abd);
// First, check if we have an auto-hide taskbar at all:
if (taskbarState & ABS_AUTOHIDE) {
bool top = false, bottom = false, left = false, right = false;
// Due to ABM_GETAUTOHIDEBAREX only exists from Win8.1,
// we have to use another way to judge this if we are
// running on Windows 7 or Windows 8.
if (Utilities::isWin8Point1OrGreater()) {
MONITORINFO monitorInfo;
SecureZeroMemory(&monitorInfo, sizeof(monitorInfo));
monitorInfo.cbSize = sizeof(monitorInfo);
const HMONITOR monitor = MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST);
GetMonitorInfoW(monitor, &monitorInfo);
// This helper can be used to determine if there's a
// auto-hide taskbar on the given edge of the monitor
// we're currently on.
const auto hasAutohideTaskbar = [&monitorInfo](const UINT edge) -> bool {
APPBARDATA _abd;
SecureZeroMemory(&_abd, sizeof(_abd));
_abd.cbSize = sizeof(_abd);
_abd.uEdge = edge;
_abd.rc = monitorInfo.rcMonitor;
const auto hTaskbar = reinterpret_cast<HWND>(SHAppBarMessage(ABM_GETAUTOHIDEBAREX, &_abd));
return hTaskbar != nullptr;
};
top = hasAutohideTaskbar(ABE_TOP);
bottom = hasAutohideTaskbar(ABE_BOTTOM);
left = hasAutohideTaskbar(ABE_LEFT);
right = hasAutohideTaskbar(ABE_RIGHT);
} else {
// The following code is copied from Mozilla Firefox,
// with some modifications.
int edge = -1;
APPBARDATA _abd;
SecureZeroMemory(&_abd, sizeof(_abd));
_abd.cbSize = sizeof(_abd);
_abd.hWnd = FindWindowW(L"Shell_TrayWnd", nullptr);
if (_abd.hWnd) {
const HMONITOR windowMonitor = MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST);
const HMONITOR taskbarMonitor = MonitorFromWindow(_abd.hWnd, MONITOR_DEFAULTTOPRIMARY);
if (taskbarMonitor == windowMonitor) {
SHAppBarMessage(ABM_GETTASKBARPOS, &_abd);
edge = _abd.uEdge;
}
}
top = edge == ABE_TOP;
bottom = edge == ABE_BOTTOM;
left = edge == ABE_LEFT;
right = edge == ABE_RIGHT;
}
// If there's a taskbar on any side of the monitor, reduce
// our size a little bit on that edge.
// Note to future code archeologists:
// This doesn't seem to work for fullscreen on the primary
// display. However, testing a bunch of other apps with
// fullscreen modes and an auto-hiding taskbar has
// shown that _none_ of them reveal the taskbar from
// fullscreen mode. This includes Edge, Firefox, Chrome,
// Sublime Text, PowerPoint - none seemed to support this.
// This does however work fine for maximized.
if (top) {
// Peculiarly, when we're fullscreen,
clientRect->top += kAutoHideTaskbarThicknessPy;
nonClientAreaExists = true;
} else if (bottom) {
clientRect->bottom -= kAutoHideTaskbarThicknessPy;
nonClientAreaExists = true;
} else if (left) {
clientRect->left += kAutoHideTaskbarThicknessPx;
nonClientAreaExists = true;
} else if (right) {
clientRect->right -= kAutoHideTaskbarThicknessPx;
nonClientAreaExists = true;
}
}
}
#if 0
// Fix the flickering issue while resizing.
// "clientRect->right += 1;" also works.
// This small technique is known to have two draw backs:
// (1) Qt's coordinate system will be confused because the canvas size
// doesn't match the client area size so you will get some warnings
// from Qt and you should also be careful when you try to draw something
// manually through QPainter or in Qt Quick, be aware of the coordinate
// mismatch issue when you calculate position yourself.
// (2) Qt's window system will take some wrong actions when the window
// is being resized. For example, the window size will become 1px smaller
// or bigger everytime when resize() is called because the client area size
// is not correct. It confuses QPA's internal logic.
clientRect->bottom += 1;
#endif
// If the window bounds change, we're going to relayout and repaint
// anyway. Returning WVR_REDRAW avoids an extra paint before that of
// the old client pixels in the (now wrong) location, and thus makes
// actions like resizing a window from the left edge look slightly
// less broken.
//
// We cannot return WVR_REDRAW when there is nonclient area, or
// Windows exhibits bugs where client pixels and child HWNDs are
// mispositioned by the width/height of the upper-left nonclient
// area.
*result = nonClientAreaExists ? 0 : WVR_REDRAW;
return true;
}
// These undocumented messages are sent to draw themed window
// borders. Block them to prevent drawing borders over the client
// area.
case WM_NCUAHDRAWCAPTION:
case WM_NCUAHDRAWFRAME: {
if (shouldHaveWindowFrame()) {
break;
} else {
*result = 0;
return true;
}
}
case WM_NCPAINT: {
// 边框阴影处于非客户区的范围，因此如果直接阻止非客户区的绘制，会导致边框阴影丢失
if (!Utilities::isDwmCompositionAvailable() && !shouldHaveWindowFrame()) {
// Only block WM_NCPAINT when DWM composition is disabled. If
// it's blocked when DWM composition is enabled, the frame
// shadow won't be drawn.
*result = 0;
return true;
} else {
break;
}
}
case WM_NCACTIVATE: {
if (shouldHaveWindowFrame()) {
break;
} else {
if (Utilities::isDwmCompositionAvailable()) {
// DefWindowProc won't repaint the window border if lParam
// (normally a HRGN) is -1. See the following link's "lParam"
// section:
// https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-ncactivate
// Don't use "*result = 0" otherwise the window won't respond
// to the window active state change.
*result = DefWindowProcW(msg->hwnd, msg->message, msg->wParam, -1);
} else {
if (static_cast<BOOL>(msg->wParam)) {
*result = FALSE;
} else {
*result = TRUE;
}
}
return true;
}
}
case WM_NCHITTEST: {
// 原生Win32窗口只有顶边是在窗口内部resize的，其余三边都是在窗口
// 外部进行resize的，其原理是，WS_THICKFRAME这个窗口样式会在窗
// 口的左、右和底边添加三个透明的resize区域，这三个区域在正常状态
// 下是完全不可见的，它们由DWM负责绘制和控制。这些区域的宽度等于
// (SM_CXSIZEFRAME + SM_CXPADDEDBORDER)，高度等于
// (SM_CYSIZEFRAME + SM_CXPADDEDBORDER)，在100%缩放时，均等
// 于8像素。它们属于窗口区域的一部分，但不属于客户区，而是属于非客
// 户区，因此GetWindowRect获取的区域中是包含这三个resize区域的，
// 而GetClientRect获取的区域是不包含它们的。当把
// DWMWA_EXTENDED_FRAME_BOUNDS作为参数调用
// DwmGetWindowAttribute时，也能获取到一个窗口大小，这个大小介
// 于前面两者之间，暂时不知道这个数据的意义及其作用。我们在
// WM_NCCALCSIZE消息的处理中，已经把整个窗口都设置为客户区了，也
// 就是说，我们的窗口已经没有非客户区了，因此那三个透明的resize区
// 域，此刻也已经成为窗口客户区的一部分了，从而变得不透明了。所以
// 现在的resize，看起来像是在窗口内部resize，是因为原本透明的地方
// 现在变得不透明了，实际上，单纯从范围上来看，现在我们resize的地方，
// 就是普通窗口的边框外部，那三个透明区域的范围。
// 因此，如果我们把边框完全去掉（就是我们正在做的事情），resize就
// 会看起来是在内部进行，这个问题通过常规方法非常难以解决。我测试过
// QQ和钉钉的窗口，它们的窗口就是在外部resize，但实际上它们是通过
// 把窗口实际的内容，嵌入到一个完全透明的但尺寸要大一圈的窗口中实现
// 的，虽然看起来效果还行，但在我看来不是正途。而且我之所以能发现，
// 也是由于这种方法在很多情况下会露馅，比如窗口未响应卡住或贴边的时
// 候，能明显看到窗口周围多出来一圈边界。我曾经尝试再把那三个区域弄
// 透明，但无一例外都会破坏DWM绘制的边框阴影，因此只好作罢。
// 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 or height is eight pixels 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. As what we have said in WM_NCCALCSIZE, you can only
// remove the top area of the window, this will let us be able to
// resize outside of the window and don't need much process in this
// message, it looks like a perfect plan, however, the top border is
// missing due to the whole top area is removed, and it's very hard
// to bring it back because we have to use a trick in WM_PAINT
// (learned from Windows Terminal), but no matter what we do in
// WM_PAINT, it will always break the backing store mechanism of Qt,
// so actually we can't do it. And it's very difficult to do such
// things in NativeEventFilters as well. What's worse, if we really
// do this, the four window borders will become white and they look
// horrible in dark mode. This solution only supports Windows 10
// because the border width on Win10 is only one pixel, however it's
// eight pixels on Windows 7 so preserving the three window borders
// looks terrible on old systems. I'm testing this solution in
// another branch, if you are interested in it, you can give it a
// try.
if (Utilities::shouldUseNativeTitleBar()) {
break;
}
const QPointF globalMouse = Utilities::getGlobalMousePosition(window);
POINT winLocalMouse = {qRound(globalMouse.x()), qRound(globalMouse.y())};
ScreenToClient(msg->hwnd, &winLocalMouse);
const QPointF localMouse = {static_cast<qreal>(winLocalMouse.x), static_cast<qreal>(winLocalMouse.y)};
const int rbh = getSystemMetric(window, Utilities::SystemMetric::ResizeBorderHeight, true);
const int tbh = getSystemMetric(window, Utilities::SystemMetric::TitleBarHeight, true);
const bool isTitleBar = (localMouse.y() > rbh) && (localMouse.y() <= (rbh + tbh))
&& !Utilities::isHitTestVisibleInChrome(window);
const bool isTop = localMouse.y() <= rbh;
if (shouldHaveWindowFrame()) {
// This will handle the left, right and bottom parts of the frame
// because we didn't change them.
const LRESULT originalRet = DefWindowProcW(msg->hwnd, WM_NCHITTEST, msg->wParam, msg->lParam);
if (originalRet != HTCLIENT) {
*result = originalRet;
return true;
}
// At this point, we know that the cursor is inside the client area
// so it has to be either the little border at the top of our custom
// title bar or the drag bar. Apparently, it must be the drag bar or
// the little border at the top which the user can use to move or
// resize the window.
if (!IsMaximized(msg->hwnd) && isTop) {
*result = HTTOP;
return true;
}
if (isTitleBar) {
*result = HTCAPTION;
return true;
}
*result = HTCLIENT;
return true;
} else {
const auto getHitTestResult =
[msg, isTitleBar, &localMouse, rbh, isTop, window]() -> LRESULT {
RECT clientRect = {0, 0, 0, 0};
GetClientRect(msg->hwnd, &clientRect);
const LONG ww = clientRect.right;
const LONG wh = clientRect.bottom;
const int rbw = getSystemMetric(window, Utilities::SystemMetric::ResizeBorderWidth, true);
if (IsMaximized(msg->hwnd)) {
if (isTitleBar) {
return HTCAPTION;
}
return HTCLIENT;
}
const bool isBottom = (localMouse.y() >= (wh - rbh));
// Make the border a little wider to let the user easy to resize on corners.
const qreal factor = (isTop || isBottom) ? 2.0 : 1.0;
const bool isLeft = (localMouse.x() <= qRound(static_cast<qreal>(rbw) * factor));
const bool isRight = (localMouse.x() >= (ww - qRound(static_cast<qreal>(rbw) * factor)));
const bool fixedSize = Utilities::isWindowFixedSize(window);
const auto getBorderValue = [fixedSize](int value) -> int {
return fixedSize ? HTCLIENT : value;
};
if (isTop) {
if (isLeft) {
return getBorderValue(HTTOPLEFT);
}
if (isRight) {
return getBorderValue(HTTOPRIGHT);
}
return getBorderValue(HTTOP);
}
if (isBottom) {
if (isLeft) {
return getBorderValue(HTBOTTOMLEFT);
}
if (isRight) {
return getBorderValue(HTBOTTOMRIGHT);
}
return getBorderValue(HTBOTTOM);
}
if (isLeft) {
return getBorderValue(HTLEFT);
}
if (isRight) {
return getBorderValue(HTRIGHT);
}
if (isTitleBar) {
return HTCAPTION;
}
return HTCLIENT;
};
*result = getHitTestResult();
return true;
}
}
case WM_SETICON:
case WM_SETTEXT: {
if (Utilities::shouldUseNativeTitleBar()) {
break;
}
// Disable painting while these messages are handled to prevent them
// from drawing a window caption over the client area.
const auto oldStyle = GetWindowLongPtrW(msg->hwnd, GWL_STYLE);
// Prevent Windows from drawing the default title bar by temporarily
// toggling the WS_VISIBLE style.
SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle & ~WS_VISIBLE);
Utilities::triggerFrameChange(reinterpret_cast<WId>(msg->hwnd));
const LRESULT ret = DefWindowProcW(msg->hwnd, msg->message, msg->wParam, msg->lParam);
SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle);
Utilities::triggerFrameChange(reinterpret_cast<WId>(msg->hwnd));
*result = ret;
return true;
}
default:
break;
}
return false;
}