17105cfd07
Add wxMSWWinStyleUpdater and wxMSWWinExStyleUpdater helper classes which allow writing code changing GWL_STYLE and GWL_EXSTYLE bits, respectively, in a shorter and more clear way. There should be no real changes in behaviour.
135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/private/winstyle.h
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// Purpose: Small helper class for updating MSW windows style
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// Author: Vadim Zeitlin
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// Created: 2017-12-09
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// Copyright: (c) 2017 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_MSW_PRIVATE_WINSTYLE_H_
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#define _WX_MSW_PRIVATE_WINSTYLE_H_
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// ----------------------------------------------------------------------------
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// wxMSWWinLongUpdater
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// ----------------------------------------------------------------------------
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/*
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This class is not used directly, but either as wxMSWWinStyleUpdater or
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wxMSWWinExStyleUpdater, both of which inherit from it and can be used like
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this:
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void SomeFunction()
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{
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wxMSWWinStyleUpdater updateStyle(GetHwndOf(m_win));
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if ( some-condition )
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updateStyle.TurnOn(XX_YYY);
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// Style update happens here implicitly -- or call Apply().
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}
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*/
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class wxMSWWinLongUpdater
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{
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public:
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// Get the current style.
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LONG_PTR Get() const
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{
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return m_styleCurrent;
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}
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// Check if the given style bit(s) is (are all) currently turned on.
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bool IsOn(LONG_PTR style) const
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{
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return (m_styleCurrent & style) == style;
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}
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// Turn on some bit(s) in the style.
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wxMSWWinLongUpdater& TurnOn(LONG_PTR on)
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{
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m_style |= on;
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return *this;
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}
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// Turn off some bit(s) in the style.
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wxMSWWinLongUpdater& TurnOff(LONG_PTR off)
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{
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m_style &= ~off;
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return *this;
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}
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// Turn some bit(s) on or off depending on the condition.
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wxMSWWinLongUpdater& TurnOnOrOff(bool cond, LONG_PTR style)
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{
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return cond ? TurnOn(style) : TurnOff(style);
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}
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// Perform the style update (only if necessary, i.e. if the style really
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// changed).
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//
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// Notice that if this method is not called, it's still done from the dtor,
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// so it's just a convenient way to do it sooner and avoid having to create
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// a new scope for ensuring that the dtor runs at the right place, but
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// otherwise is equivalent to do this.
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bool Apply()
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{
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if ( m_style == m_styleCurrent )
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return false;
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::SetWindowLongPtr(m_hwnd, m_gwlSlot, m_style);
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m_styleCurrent = m_style;
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return true;
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}
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~wxMSWWinLongUpdater()
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{
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Apply();
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}
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protected:
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// Create the object for updating the style or extended style of the given
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// window.
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//
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// Ctor is protected, this class can only be used as wxMSWWinStyleUpdater
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// or wxMSWWinExStyleUpdater.
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wxMSWWinLongUpdater(HWND hwnd, int gwlSlot)
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: m_hwnd(hwnd),
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m_gwlSlot(gwlSlot),
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m_styleCurrent(::GetWindowLongPtr(hwnd, gwlSlot)),
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m_style(m_styleCurrent)
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{
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}
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private:
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const HWND m_hwnd;
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const int m_gwlSlot;
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LONG_PTR m_styleCurrent;
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LONG_PTR m_style;
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wxDECLARE_NO_COPY_CLASS(wxMSWWinLongUpdater);
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};
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// A variant of wxMSWWinLongUpdater which updates the extended style.
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class wxMSWWinStyleUpdater : public wxMSWWinLongUpdater
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{
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public:
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explicit wxMSWWinStyleUpdater(HWND hwnd)
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: wxMSWWinLongUpdater(hwnd, GWL_STYLE)
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{
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}
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};
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// A variant of wxMSWWinLongUpdater which updates the extended style.
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class wxMSWWinExStyleUpdater : public wxMSWWinLongUpdater
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{
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public:
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explicit wxMSWWinExStyleUpdater(HWND hwnd)
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: wxMSWWinLongUpdater(hwnd, GWL_EXSTYLE)
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{
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}
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};
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#endif // _WX_MSW_PRIVATE_WINSTYLE_H_
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