mirror of
https://github.com/wxWidgets/wxWidgets.git
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Vadim Zeitlin
082f9d4034
Using wxOverlayDC is simpler than creating wxClientDC and wxDCOverlay on top of it and allows to avoid using wxClientDC directly.
118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/overlay.h
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// Purpose: wxOverlay class
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// Author: Stefan Csomor
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// Created: 2006-10-20
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_OVERLAY_H_
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#define _WX_OVERLAY_H_
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#include "wx/defs.h"
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#include "wx/dcclient.h"
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// ----------------------------------------------------------------------------
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// creates an overlay over an existing window, allowing for manipulations like
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// rubberbanding etc.
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxOverlay
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{
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public:
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class Impl;
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wxOverlay();
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~wxOverlay();
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// clears the overlay without restoring the former state
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// to be done eg when the window content has been changed and repainted
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void Reset();
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bool IsNative() const;
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void SetOpacity(int alpha);
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private:
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friend class WXDLLIMPEXP_FWD_CORE wxDCOverlay;
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static Impl* Create();
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// returns true if it has been setup
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bool IsOk();
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void Init(wxDC* dc, int x , int y , int width , int height);
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void BeginDrawing(wxDC* dc);
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void EndDrawing(wxDC* dc);
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void Clear(wxDC* dc);
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Impl* m_impl;
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bool m_inDrawing;
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wxDECLARE_NO_COPY_CLASS(wxOverlay);
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};
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class WXDLLIMPEXP_CORE wxDCOverlay
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{
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public:
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// connects this overlay to the corresponding drawing dc, if the overlay is
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// not initialized yet this call will do so
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wxDCOverlay(wxOverlay &overlay, wxDC *dc, int x , int y , int width , int height);
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// convenience wrapper that behaves the same using the entire area of the dc
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wxDCOverlay(wxOverlay &overlay, wxDC *dc);
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// removes the connection between the overlay and the dc
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virtual ~wxDCOverlay();
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// clears the layer, restoring the state at the last init
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void Clear();
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private:
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void Init(wxDC *dc, int x , int y , int width , int height);
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wxOverlay& m_overlay;
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wxDC* m_dc;
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wxDECLARE_NO_COPY_CLASS(wxDCOverlay);
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};
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// Convenient class combining wxClientDC with wxDCOverlay.
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class wxOverlayDC : public wxClientDC
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{
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public:
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wxOverlayDC(wxOverlay& overlay, wxWindow* win)
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: wxClientDC(win),
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m_dcOverlay(overlay, this)
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{
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}
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wxOverlayDC(wxOverlay& overlay, wxWindow* win, const wxRect& rect)
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: wxClientDC(win),
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m_dcOverlay(overlay, this, rect.x, rect.y, rect.width, rect.height)
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{
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}
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void Clear()
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{
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m_dcOverlay.Clear();
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}
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private:
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wxDCOverlay m_dcOverlay;
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wxDECLARE_NO_COPY_CLASS(wxOverlayDC);
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};
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#endif // _WX_OVERLAY_H_
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