我在Qt中编写了一个跨平台的Web浏览器,因为它通过QWebView或更新的QWebEngineView内置了WebKit支持。为了获得紧凑的窗口镶边,我想通过Qt :: FramelessWindowHint禁用本机窗口标题栏和边框,但仍然会获得本机行为,如调整大小和Windows' Aero Snap。
首先,我调整了PKE的BorderlessWindow演示。这很好用:在Windows 8.1 x64上,窗口可以调整大小,可以拖动或双击自定义标题栏,Aero Snap可以工作。
然后我尝试用QWebEngineView替换中央QLabel。这导致灰色原生大小的边框出现在我的窗口周围。当我在窗口顶部有交互式小部件时(如菜单或工具栏)," ghost"带有QWebEngineView的标题栏将它们向下推,但接受光标点击。
这是比较两个窗口的屏幕截图。 (在深色背景上查看它以更好地看到右侧的浅灰色边框。)
QWebEngineView是否与无框窗口兼容,还是应该处理原生窗口chrome的浪费空间?
编辑:用QWebView替换QWebEngineView可以避免此问题:
但是,不推荐使用WebView,WebEngine具有更多有用的功能:
尽管如此,我真的不想在原生标题栏上浪费空间,所以如果QWebEngineView可以用于无框窗口,我想知道如何。
mainwindow.h:
#include <QtWidgets>
#include <QToolBar>
class MainWindow : public QMainWindow {
Q_OBJECT
public:
MainWindow();
protected:
void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
bool nativeEvent(const QByteArray &eventType, void *message, long *result) Q_DECL_OVERRIDE;
private:
QToolBar *titleBar;
};
mainwindow.cpp:
#include <QtWidgets>
#include <QLabel>
#include <QWebEngineView>
#include <windows.h>
#include <windowsx.h>
#include "mainwindow.h"
MainWindow::MainWindow() : QMainWindow() {
setWindowFlags(windowFlags() | Qt::FramelessWindowHint);
titleBar = addToolBar(tr("Title Bar"));
titleBar->setIconSize(QSize(16, 16));
titleBar->setFloatable(false);
titleBar->setMovable(false);
titleBar->setStyleSheet("QToolBar { background: red; border: 0; padding: 0; }");
titleBar->addWidget(new QLabel("Title Bar", titleBar));
// Try QLabel...
QLabel *central = new QLabel("Hello World");
// ...or QWebEngineView
//QWebEngineView *central = new QWebEngineView(this);
//central->load(QUrl("http://www.google.com"));
setCentralWidget(central);
resize(320, 240);
}
bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *result) {
Q_UNUSED(eventType);
MSG *msg = (MSG *)message;
HWND hwnd = isVisible() ? (HWND)winId() : NULL;
LPARAM lparam = msg->lParam;
const LONG border_width = 4;
RECT winrect;
long x, y;
switch (msg->message) {
case WM_NCCALCSIZE:
result = 0;
return true;
case WM_NCHITTEST:
GetWindowRect(hwnd, &winrect);
x = GET_X_LPARAM(lparam);
y = GET_Y_LPARAM(lparam);
if (x >= winrect.left && x < winrect.left + border_width &&
y < winrect.bottom && y >= winrect.bottom - border_width)
*result = HTBOTTOMLEFT;
else if (x < winrect.right && x >= winrect.right - border_width &&
y < winrect.bottom && y >= winrect.bottom - border_width)
*result = HTBOTTOMRIGHT;
else if (x >= winrect.left && x < winrect.left + border_width &&
y >= winrect.top && y < winrect.top + border_width)
*result = HTTOPLEFT;
else if (x < winrect.right && x >= winrect.right - border_width &&
y >= winrect.top && y < winrect.top + border_width)
*result = HTTOPRIGHT;
else if (x >= winrect.left && x < winrect.left + border_width)
*result = HTLEFT;
else if (x < winrect.right && x >= winrect.right - border_width)
*result = HTRIGHT;
else if (y < winrect.bottom && y >= winrect.bottom - border_width)
*result = HTBOTTOM;
else if (y >= winrect.top && y < winrect.top + border_width)
*result = HTTOP;
else if (titleBar->underMouse())
*result = HTCAPTION;
else
break;
return true;
}
return QMainWindow::nativeEvent(eventType, message, result);
}
void MainWindow::showEvent(QShowEvent *event) {
Q_UNUSED(event);
HWND hwnd = (HWND)winId();
DWORD newStyle = WS_POPUP | WS_CAPTION | WS_THICKFRAME | WS_MAXIMIZEBOX | WS_MINIMIZEBOX;
SetWindowLongPtr(hwnd, GWL_STYLE, static_cast<LONG>(newStyle));
SetWindowPos(hwnd, 0, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE);
ShowWindow(hwnd, SW_SHOW);
}
main.cpp中:
#include <QtWidgets>
#include "mainwindow.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
MainWindow *window = new MainWindow();
window->show();
return app.exec();
}
example.pro:
QT += core gui widgets webenginewidgets
msvc:LIBS += -luser32
TEMPLATE = app
SOURCES += main.cpp \
mainwindow.cpp
HEADERS += mainwindow.h