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///////////////////////////////////////////////////////////////////////////////
// Name: wx/msw/private/winstyle.h
// Purpose: Small helper class for updating MSW windows style
// Author: Vadim Zeitlin
// Created: 2017-12-09
// Copyright: (c) 2017 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_MSW_PRIVATE_WINSTYLE_H_
#define _WX_MSW_PRIVATE_WINSTYLE_H_
// ----------------------------------------------------------------------------
// wxMSWWinLongUpdater
// ----------------------------------------------------------------------------
/*
This class is not used directly, but either as wxMSWWinStyleUpdater or
wxMSWWinExStyleUpdater, both of which inherit from it and can be used like
this:
void SomeFunction()
{
wxMSWWinStyleUpdater updateStyle(GetHwndOf(m_win));
if ( some-condition )
updateStyle.TurnOn(XX_YYY);
// Style update happens here implicitly -- or call Apply().
}
*/
class wxMSWWinLongUpdater
{
public:
// Get the current style.
LONG_PTR Get() const
{
return m_styleCurrent;
}
// Check if the given style bit(s) is (are all) currently turned on.
bool IsOn(LONG_PTR style) const
{
return (m_styleCurrent & style) == style;
}
// Turn on some bit(s) in the style.
wxMSWWinLongUpdater& TurnOn(LONG_PTR on)
{
m_style |= on;
return *this;
}
// Turn off some bit(s) in the style.
wxMSWWinLongUpdater& TurnOff(LONG_PTR off)
{
m_style &= ~off;
return *this;
}
// Turn some bit(s) on or off depending on the condition.
wxMSWWinLongUpdater& TurnOnOrOff(bool cond, LONG_PTR style)
{
return cond ? TurnOn(style) : TurnOff(style);
}
// Perform the style update (only if necessary, i.e. if the style really
// changed).
//
// Notice that if this method is not called, it's still done from the dtor,
// so it's just a convenient way to do it sooner and avoid having to create
// a new scope for ensuring that the dtor runs at the right place, but
// otherwise is equivalent to do this.
bool Apply()
{
if ( m_style == m_styleCurrent )
return false;
::SetWindowLongPtr(m_hwnd, m_gwlSlot, m_style);
m_styleCurrent = m_style;
return true;
}
~wxMSWWinLongUpdater()
{
Apply();
}
protected:
// Create the object for updating the style or extended style of the given
// window.
//
// Ctor is protected, this class can only be used as wxMSWWinStyleUpdater
// or wxMSWWinExStyleUpdater.
wxMSWWinLongUpdater(HWND hwnd, int gwlSlot)
: m_hwnd(hwnd),
m_gwlSlot(gwlSlot),
m_styleCurrent(::GetWindowLongPtr(hwnd, gwlSlot)),
m_style(m_styleCurrent)
{
}
private:
const HWND m_hwnd;
const int m_gwlSlot;
LONG_PTR m_styleCurrent;
LONG_PTR m_style;
wxDECLARE_NO_COPY_CLASS(wxMSWWinLongUpdater);
};
// A variant of wxMSWWinLongUpdater which updates the extended style.
class wxMSWWinStyleUpdater : public wxMSWWinLongUpdater
{
public:
explicit wxMSWWinStyleUpdater(HWND hwnd)
: wxMSWWinLongUpdater(hwnd, GWL_STYLE)
{
}
};
// A variant of wxMSWWinLongUpdater which updates the extended style.
class wxMSWWinExStyleUpdater : public wxMSWWinLongUpdater
{
public:
explicit wxMSWWinExStyleUpdater(HWND hwnd)
: wxMSWWinLongUpdater(hwnd, GWL_EXSTYLE)
{
}
};
#endif // _WX_MSW_PRIVATE_WINSTYLE_H_
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