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274
wxWidgets/include/wx/msw/dragimag.h
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274
wxWidgets/include/wx/msw/dragimag.h
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/////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/dragimag.h
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// Purpose: wxDragImage class: a kind of a cursor, that can cope
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// with more sophisticated images
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// Author: Julian Smart
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// Modified by:
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// Created: 08/04/99
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// RCS-ID: $Id: dragimag.h 45845 2007-05-05 19:00:35Z PC $
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_DRAGIMAG_H_
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#define _WX_DRAGIMAG_H_
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#if wxUSE_DRAGIMAGE
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#include "wx/bitmap.h"
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#include "wx/icon.h"
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#include "wx/cursor.h"
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#include "wx/treectrl.h"
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#include "wx/listctrl.h"
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// If 1, use a simple wxCursor instead of ImageList_SetDragCursorImage
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#define wxUSE_SIMPLER_DRAGIMAGE 0
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/*
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To use this class, create a wxDragImage when you start dragging, for example:
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void MyTreeCtrl::OnBeginDrag(wxTreeEvent& event)
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{
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#ifdef __WXMSW__
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::UpdateWindow((HWND) GetHWND()); // We need to implement this in wxWidgets
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#endif
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CaptureMouse();
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m_dragImage = new wxDragImage(* this, itemId);
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m_dragImage->BeginDrag(wxPoint(0, 0), this);
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m_dragImage->Move(pt, this);
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m_dragImage->Show(this);
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...
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}
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In your OnMouseMove function, hide the image, do any display updating required,
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then move and show the image again:
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void MyTreeCtrl::OnMouseMove(wxMouseEvent& event)
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{
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if (m_dragMode == MY_TREE_DRAG_NONE)
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{
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event.Skip();
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return;
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}
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// Prevent screen corruption by hiding the image
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if (m_dragImage)
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m_dragImage->Hide(this);
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// Do some updating of the window, such as highlighting the drop target
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...
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#ifdef __WXMSW__
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if (updateWindow)
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::UpdateWindow((HWND) GetHWND());
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#endif
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// Move and show the image again
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m_dragImage->Move(event.GetPosition(), this);
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m_dragImage->Show(this);
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}
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Eventually we end the drag and delete the drag image.
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void MyTreeCtrl::OnLeftUp(wxMouseEvent& event)
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{
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...
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// End the drag and delete the drag image
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if (m_dragImage)
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{
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m_dragImage->EndDrag(this);
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delete m_dragImage;
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m_dragImage = NULL;
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}
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ReleaseMouse();
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}
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*/
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/*
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Notes for Unix version:
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Can we simply use cursors instead, creating a cursor dynamically, setting it into the window
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in BeginDrag, and restoring the old cursor in EndDrag?
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For a really bog-standard implementation, we could simply use a normal dragging cursor
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and ignore the image.
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*/
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/*
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* wxDragImage
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*/
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class WXDLLEXPORT wxDragImage: public wxObject
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{
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public:
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// Ctors & dtor
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////////////////////////////////////////////////////////////////////////////
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wxDragImage();
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wxDragImage(const wxBitmap& image, const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(image, cursor);
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}
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// Deprecated form of the above
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wxDragImage(const wxBitmap& image, const wxCursor& cursor, const wxPoint& cursorHotspot)
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{
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Init();
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Create(image, cursor, cursorHotspot);
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}
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wxDragImage(const wxIcon& image, const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(image, cursor);
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}
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// Deprecated form of the above
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wxDragImage(const wxIcon& image, const wxCursor& cursor, const wxPoint& cursorHotspot)
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{
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Init();
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Create(image, cursor, cursorHotspot);
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}
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wxDragImage(const wxString& str, const wxCursor& cursor = wxNullCursor)
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{
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Init();
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Create(str, cursor);
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}
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// Deprecated form of the above
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wxDragImage(const wxString& str, const wxCursor& cursor, const wxPoint& cursorHotspot)
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{
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Init();
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Create(str, cursor, cursorHotspot);
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}
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#if wxUSE_TREECTRL
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wxDragImage(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
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{
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Init();
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Create(treeCtrl, id);
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}
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#endif
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#if wxUSE_LISTCTRL
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wxDragImage(const wxListCtrl& listCtrl, long id)
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{
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Init();
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Create(listCtrl, id);
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}
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#endif
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virtual ~wxDragImage();
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// Attributes
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////////////////////////////////////////////////////////////////////////////
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// Operations
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////////////////////////////////////////////////////////////////////////////
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// Create a drag image from a bitmap and optional cursor
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bool Create(const wxBitmap& image, const wxCursor& cursor = wxNullCursor);
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bool Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
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{
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wxLogDebug(wxT("wxDragImage::Create: use of a cursor hotspot is now deprecated. Please omit this argument."));
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return Create(image, cursor);
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}
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// Create a drag image from an icon and optional cursor
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bool Create(const wxIcon& image, const wxCursor& cursor = wxNullCursor);
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bool Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
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{
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wxLogDebug(wxT("wxDragImage::Create: use of a cursor hotspot is now deprecated. Please omit this argument."));
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return Create(image, cursor);
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}
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// Create a drag image from a string and optional cursor
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bool Create(const wxString& str, const wxCursor& cursor = wxNullCursor);
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bool Create(const wxString& str, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
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{
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wxLogDebug(wxT("wxDragImage::Create: use of a cursor hotspot is now deprecated. Please omit this argument."));
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return Create(str, cursor);
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}
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#if wxUSE_TREECTRL
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// Create a drag image for the given tree control item
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bool Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id);
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#endif
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#if wxUSE_LISTCTRL
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// Create a drag image for the given list control item
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bool Create(const wxListCtrl& listCtrl, long id);
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#endif
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// Begin drag. hotspot is the location of the drag position relative to the upper-left
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// corner of the image.
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bool BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen = false, wxRect* rect = (wxRect*) NULL);
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// Begin drag. hotspot is the location of the drag position relative to the upper-left
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// corner of the image. This is full screen only. fullScreenRect gives the
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// position of the window on the screen, to restrict the drag to.
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bool BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect);
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// End drag
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bool EndDrag();
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// Move the image: call from OnMouseMove. Pt is in window client coordinates if window
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// is non-NULL, or in screen coordinates if NULL.
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bool Move(const wxPoint& pt);
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// Show the image
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bool Show();
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// Hide the image
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bool Hide();
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// Implementation
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////////////////////////////////////////////////////////////////////////////
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// Initialize variables
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void Init();
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// Returns the native image list handle
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WXHIMAGELIST GetHIMAGELIST() const { return m_hImageList; }
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#if !wxUSE_SIMPLER_DRAGIMAGE
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// Returns the native image list handle for the cursor
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WXHIMAGELIST GetCursorHIMAGELIST() const { return m_hCursorImageList; }
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#endif
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protected:
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WXHIMAGELIST m_hImageList;
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#if wxUSE_SIMPLER_DRAGIMAGE
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wxCursor m_oldCursor;
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#else
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WXHIMAGELIST m_hCursorImageList;
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#endif
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wxCursor m_cursor;
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// wxPoint m_cursorHotspot; // Obsolete
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wxPoint m_position;
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wxWindow* m_window;
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wxRect m_boundingRect;
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bool m_fullScreen;
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private:
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DECLARE_DYNAMIC_CLASS(wxDragImage)
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DECLARE_NO_COPY_CLASS(wxDragImage)
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};
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#endif // wxUSE_DRAGIMAGE
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#endif
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// _WX_DRAGIMAG_H_
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