Qt menu without shadow? - qt

Question

I copied the question description below from other asked but not answered question, because this is the exactly the same one I wanna ask.
I have a QMenu with a translucent background and rounded edges (border-radius). Unfortunately, Windows 7 draws a drop shadow for this menu, which does not fit to the rounded edges. Its the shadow that would be drawn for normal rectangular menus.
Is there either - a way to completely disable drawing drop shadows for QMenu or - a way to make the shadow fit to the rounded edges ?
Here is a minimalistic example where it occurs:
QPushButton b("press me");
QMenu m;
m.addAction("hello"); m.addAction("world");
m.setWindowFlags(m.windowFlags() | Qt::FramelessWindowHint);
m.setAttribute(Qt::WA_TranslucentBackground);
m.setStyleSheet("background:rgba(255,0,0,50%); border-radius:5px;");
b.setMenu(&m);
b.show();
Right now I have to turn off the menu shadow in Windows Control panel manually to get rid of that shadow.
Actually what I want to achieve is a menu like Qt's pie menu or a menu like this one:
http://upload.wikimedia.org/wikipedia/commons/8/85/Blender_2.36_Screenshot.jpg
I tried the popup widget, but it gets the shadow artifact described above.
Could anyone help this out?

Answer 1

On Windows Vista and higher, I wanted a menu with normal window shadow. So I had to do two things:
Remove CS_DROPSHADOW from the menu HWND's WNDCLASS that Qt is adding deep down in the core.
Add shadow using DWM APIs.
The trick is to capture QEvent::WinIdChange to get the HWND handle to the menu window, and then to use GetClassLong / SetClassLong to remove CS_DROPSHADOW flag. I'm doing this only once (by using a static bool), as theWNDCLASS is always the same for all menus. This might lead into a problem if part of your app wants to show the menu shadows and other does not.
I have subclassed the QMenu and I'm always using my overriden class when creating menus
Menu * my_menu = new Menu(tr("&File"));
mainMenu->addMenu(my_menu);
Here's the whole code, enjoy:
menu.h
#ifndef MENU_H
#define MENU_H
#include <QMenu>
class Menu : public QMenu
{
Q_OBJECT
public:
explicit Menu(QWidget *parent = 0);
explicit Menu(const QString & title);
protected:
virtual bool event(QEvent *event);
signals:
public slots:
};
#endif // MENU_H
menu.cpp
#include "menu.h"
#pragma comment( lib, "dwmapi.lib" )
#include "dwmapi.h"
Menu::Menu(QWidget *parent) :
QMenu(parent)
{
}
Menu::Menu(const QString &title) :
QMenu(title)
{
}
bool Menu::event(QEvent *event)
{
static bool class_amended = false;
if (event->type() == QEvent::WinIdChange)
{
HWND hwnd = reinterpret_cast<HWND>(winId());
if (class_amended == false)
{
class_amended = true;
DWORD class_style = ::GetClassLong(hwnd, GCL_STYLE);
class_style &= ~CS_DROPSHADOW;
::SetClassLong(hwnd, GCL_STYLE, class_style);
}
DWMNCRENDERINGPOLICY val = DWMNCRP_ENABLED;
::DwmSetWindowAttribute(hwnd, DWMWA_NCRENDERING_POLICY, &val, sizeof(DWMNCRENDERINGPOLICY));
// This will turn OFF the shadow
// MARGINS m = {0};
// This will turn ON the shadow
MARGINS m = {-1};
HRESULT hr = ::DwmExtendFrameIntoClientArea(hwnd, &m);
if( SUCCEEDED(hr) )
{
//do more things
}
}
return QWidget::event(event);
}

Answer 2

I just remove the Qt::popup flag to get rid of the shadow.
And I have to add close codes to any other background UI. These have been more extra work, but I got what I want :)