src/generic/dragimgg.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        dragimgg.cpp
// Purpose:     Generic wxDragImage implementation
// Author:      Julian Smart
// Modified by:
// Created:     29/2/2000
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "dragimgg.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#if wxUSE_DRAGIMAGE

#ifndef WX_PRECOMP
#include <stdio.h>
#include "wx/setup.h"
#include "wx/window.h"
#include "wx/frame.h"
#include "wx/dcclient.h"
#include "wx/dcscreen.h"
#include "wx/dcmemory.h"
#include "wx/settings.h"
#endif

#include "wx/log.h"
#include "wx/intl.h"

#ifdef __WIN16__
#define wxUSE_IMAGE_IN_DRAGIMAGE 0
#else
#define wxUSE_IMAGE_IN_DRAGIMAGE 1
#endif

#if wxUSE_IMAGE_IN_DRAGIMAGE
#include "wx/image.h"
#endif

#include "wx/generic/dragimgg.h"

// ----------------------------------------------------------------------------
// macros
// ----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxGenericDragImage, wxObject)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxGenericDragImage ctors/dtor
// ----------------------------------------------------------------------------

wxGenericDragImage::~wxGenericDragImage()
{
    if (m_windowDC)
    {
        delete m_windowDC;
    }
}

void wxGenericDragImage::Init()
{
    m_isDirty = FALSE;
    m_isShown = FALSE;
    m_windowDC = (wxDC*) NULL;
    m_window = (wxWindow*) NULL;
    m_fullScreen = FALSE;
    m_pBackingBitmap = (wxBitmap*) NULL;
}

// Attributes
////////////////////////////////////////////////////////////////////////////


// Operations
////////////////////////////////////////////////////////////////////////////

// Create a drag image with a virtual image (need to override DoDrawImage, GetImageRect)
bool wxGenericDragImage::Create(const wxCursor& cursor)
{
    m_cursor = cursor;

    return TRUE;
}

// Create a drag image from a bitmap and optional cursor
bool wxGenericDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
{
    // We don't have to combine the cursor explicitly since we simply show the cursor
    // as we drag. This currently will only work within one window.

    m_cursor = cursor;
    m_bitmap = image;

    return TRUE ;
}

// Create a drag image from an icon and optional cursor
bool wxGenericDragImage::Create(const wxIcon& image, const wxCursor& cursor)
{
    // We don't have to combine the cursor explicitly since we simply show the cursor
    // as we drag. This currently will only work within one window.

    m_cursor = cursor;
    m_icon = image;

    return TRUE ;
}

// Create a drag image from a string and optional cursor
bool wxGenericDragImage::Create(const wxString& str, const wxCursor& cursor)
{
    wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));

    long w, h;
    wxScreenDC dc;
    dc.SetFont(font);
    dc.GetTextExtent(str, & w, & h);
    dc.SetFont(wxNullFont);

    wxMemoryDC dc2;

    // Sometimes GetTextExtent isn't accurate enough, so make it longer
    wxBitmap bitmap((int) ((w+2) * 1.5), (int) h+2);
    dc2.SelectObject(bitmap);

    dc2.SetFont(font);
    dc2.SetBackground(* wxWHITE_BRUSH);
    dc2.Clear();
    dc2.SetBackgroundMode(wxTRANSPARENT);
    dc2.SetTextForeground(* wxLIGHT_GREY);
    dc2.DrawText(str, 0, 0);
    dc2.DrawText(str, 1, 0);
    dc2.DrawText(str, 2, 0);
    dc2.DrawText(str, 1, 1);
    dc2.DrawText(str, 2, 1);
    dc2.DrawText(str, 1, 2);
    dc2.DrawText(str, 2, 2);

    dc2.SetTextForeground(* wxBLACK);
    dc2.DrawText(str, 1, 1);

    dc2.SelectObject(wxNullBitmap);

#if wxUSE_IMAGE_IN_DRAGIMAGE
    // Make the bitmap masked
    wxImage image = bitmap.ConvertToImage();
    image.SetMaskColour(255, 255, 255);
    bitmap = wxBitmap(image);
#endif

    return Create(bitmap, cursor);
}

#if wxUSE_TREECTRL
// Create a drag image for the given tree control item
bool wxGenericDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
{
    wxString str = treeCtrl.GetItemText(id);
    return Create(str);
}
#endif

#if wxUSE_LISTCTRL
// Create a drag image for the given list control item
bool wxGenericDragImage::Create(const wxListCtrl& listCtrl, long id)
{
    wxString str = listCtrl.GetItemText(id);
    return Create(str);
}
#endif

// Begin drag
bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot,
                                   wxWindow* window,
                                   bool fullScreen,
                                   wxRect* rect)
{
    wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));

    // The image should be offset by this amount
    m_offset = hotspot;
    m_window = window;
    m_fullScreen = fullScreen;

    if (rect)
        m_boundingRect = * rect;

    m_isDirty = FALSE;
    m_isDirty = FALSE;

    if (window)
    {
        window->CaptureMouse();

        if (m_cursor.Ok())
        {
            m_oldCursor = window->GetCursor();
            window->SetCursor(m_cursor);
        }
    }

    // Make a copy of the window so we can repair damage done as the image is
    // dragged.

    wxSize clientSize;
    wxPoint pt(0, 0);
    if (!m_fullScreen)
    {
        clientSize = window->GetClientSize();
        m_boundingRect.x = 0; m_boundingRect.y = 0;
        m_boundingRect.width = clientSize.x; m_boundingRect.height = clientSize.y;
    }
    else
    {
        int w, h;
        wxDisplaySize(& w, & h);
        clientSize.x = w; clientSize.y = h;
        if (rect)
        {
            pt.x = m_boundingRect.x; pt.y = m_boundingRect.y;
            clientSize.x = m_boundingRect.width; clientSize.y = m_boundingRect.height;
        }
        else
        {
            m_boundingRect.x = 0; m_boundingRect.y = 0;
            m_boundingRect.width = w; m_boundingRect.height = h;
        }
    }

    wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);

    if (!backing->Ok() || (backing->GetWidth() < clientSize.x || backing->GetHeight() < clientSize.y))
        (*backing) = wxBitmap(clientSize.x, clientSize.y);

    if (!m_fullScreen)
    {
        m_windowDC = new wxClientDC(window);
    }
    else
    {
        m_windowDC = new wxScreenDC;

#if 0
        // Use m_boundingRect to limit the area considered.
        ((wxScreenDC*) m_windowDC)->StartDrawingOnTop(rect);
#endif

        m_windowDC->SetClippingRegion(m_boundingRect.x, m_boundingRect.y,
            m_boundingRect.width, m_boundingRect.height);
    }

    return TRUE;
}

// Begin drag. hotspot is the location of the drag position relative to the upper-left
// corner of the image. This is full screen only. fullScreenRect gives the
// position of the window on the screen, to restrict the drag to.
bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
{
    wxRect rect;

    int x = fullScreenRect->GetPosition().x;
    int y = fullScreenRect->GetPosition().y;

    wxSize sz = fullScreenRect->GetSize();

    if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
        fullScreenRect->GetParent()->ClientToScreen(& x, & y);

    rect.x = x; rect.y = y;
    rect.width = sz.x; rect.height = sz.y;

    return BeginDrag(hotspot, window, TRUE, & rect);
}

// End drag
bool wxGenericDragImage::EndDrag()
{
    if (m_window)
    {
#ifdef __WXMSW__
        // Under Windows we can be pretty sure this test will give
        // the correct results
        if (wxWindow::GetCapture() == m_window)
#endif
            m_window->ReleaseMouse();

        if (m_cursor.Ok() && m_oldCursor.Ok())
        {
            m_window->SetCursor(m_oldCursor);
        }
    }

    if (m_windowDC)
    {
        m_windowDC->DestroyClippingRegion();
        delete m_windowDC;
        m_windowDC = (wxDC*) NULL;
    }

    m_repairBitmap = wxNullBitmap;

    return TRUE;
}

// Move the image: call from OnMouseMove. Pt is in window client coordinates if window
// is non-NULL, or in screen coordinates if NULL.
bool wxGenericDragImage::Move(const wxPoint& pt)
{
    wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Move()") );

    wxPoint pt2(pt);
    if (m_fullScreen)
        pt2 = m_window->ClientToScreen(pt);

    // Erase at old position, then show at the current position
    wxPoint oldPos = m_position;

    bool eraseOldImage = (m_isDirty && m_isShown);

    if (m_isShown)
        RedrawImage(oldPos - m_offset, pt2 - m_offset, eraseOldImage, TRUE);

    m_position = pt2;

    if (m_isShown)
        m_isDirty = TRUE;

    return TRUE;
}

bool wxGenericDragImage::Show()
{
    wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Show()") );

    // Show at the current position

    if (!m_isShown)
    {
        // This is where we restore the backing bitmap, in case
        // something has changed on the window.

        wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
        wxMemoryDC memDC;
        memDC.SelectObject(* backing);

        UpdateBackingFromWindow(* m_windowDC, memDC, m_boundingRect, wxRect(0, 0, m_boundingRect.width, m_boundingRect.height));

        //memDC.Blit(0, 0, m_boundingRect.width, m_boundingRect.height, m_windowDC, m_boundingRect.x, m_boundingRect.y);
        memDC.SelectObject(wxNullBitmap);

        RedrawImage(m_position - m_offset, m_position - m_offset, FALSE, TRUE);
    }

    m_isShown = TRUE;
    m_isDirty = TRUE;

    return TRUE;
}

bool wxGenericDragImage::UpdateBackingFromWindow(wxDC& windowDC, wxMemoryDC& destDC,
    const wxRect& sourceRect, const wxRect& destRect) const
{
    return destDC.Blit(destRect.x, destRect.y, destRect.width, destRect.height, & windowDC,
        sourceRect.x, sourceRect.y);
}

bool wxGenericDragImage::Hide()
{
    wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Hide()") );

    // Repair the old position

    if (m_isShown && m_isDirty)
    {
        RedrawImage(m_position - m_offset, m_position - m_offset, TRUE, FALSE);
    }

    m_isShown = FALSE;
    m_isDirty = FALSE;

    return TRUE;
}

// More efficient: erase and redraw simultaneously if possible
bool wxGenericDragImage::RedrawImage(const wxPoint& oldPos, const wxPoint& newPos,
                                     bool eraseOld, bool drawNew)
{
    if (!m_windowDC)
        return FALSE;

    wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
    if (!backing->Ok())
        return FALSE;

    wxRect oldRect(GetImageRect(oldPos));
    wxRect newRect(GetImageRect(newPos));

    wxRect fullRect;

    // Full rect: the combination of both rects
    if (eraseOld && drawNew)
    {
        int oldRight = oldRect.GetRight();
        int oldBottom = oldRect.GetBottom();
        int newRight = newRect.GetRight();
        int newBottom = newRect.GetBottom();

        wxPoint topLeft = wxPoint(wxMin(oldPos.x, newPos.x), wxMin(oldPos.y, newPos.y));
        wxPoint bottomRight = wxPoint(wxMax(oldRight, newRight), wxMax(oldBottom, newBottom));

        fullRect.x = topLeft.x; fullRect.y = topLeft.y;
        fullRect.SetRight(bottomRight.x);
        fullRect.SetBottom(bottomRight.y);
    }
    else if (eraseOld)
        fullRect = oldRect;
    else if (drawNew)
        fullRect = newRect;

    // Make the bitmap bigger than it need be, so we don't
    // keep reallocating all the time.
    int excess = 50;

    if (!m_repairBitmap.Ok() || (m_repairBitmap.GetWidth() < fullRect.GetWidth() || m_repairBitmap.GetHeight() < fullRect.GetHeight()))
    {
        m_repairBitmap = wxBitmap(fullRect.GetWidth() + excess, fullRect.GetHeight() + excess);
    }

    wxMemoryDC memDC;
    memDC.SelectObject(* backing);

    wxMemoryDC memDCTemp;
    memDCTemp.SelectObject(m_repairBitmap);

    // Draw the backing bitmap onto the repair bitmap.
    // If full-screen, we may have specified the rect on the
    // screen that we're using for our backing bitmap.
    // So subtract this when we're blitting from the backing bitmap
    // (translate from screen to backing-bitmap coords).

    memDCTemp.Blit(0, 0, fullRect.GetWidth(), fullRect.GetHeight(), & memDC, fullRect.x - m_boundingRect.x, fullRect.y - m_boundingRect.y);

    // If drawing, draw the image onto the mem DC
    if (drawNew)
    {
        wxPoint pos(newPos.x - fullRect.x, newPos.y - fullRect.y) ;
        DoDrawImage(memDCTemp, pos);
    }

    // Now blit to the window
    // Finally, blit the temp mem DC to the window.
    m_windowDC->Blit(fullRect.x, fullRect.y, fullRect.width, fullRect.height, & memDCTemp, 0, 0);

    memDCTemp.SelectObject(wxNullBitmap);
    memDC.SelectObject(wxNullBitmap);

    return TRUE;
}

// Override this if you are using a virtual image (drawing your own image)
bool wxGenericDragImage::DoDrawImage(wxDC& dc, const wxPoint& pos) const
{
    if (m_bitmap.Ok())
    {
        dc.DrawBitmap(m_bitmap, pos.x, pos.y, (m_bitmap.GetMask() != 0));
        return TRUE;
    }
    else if (m_icon.Ok())
    {
        dc.DrawIcon(m_icon, pos.x, pos.y);
        return TRUE;
    }
    else
        return FALSE;
}

// Override this if you are using a virtual image (drawing your own image)
wxRect wxGenericDragImage::GetImageRect(const wxPoint& pos) const
{
    if (m_bitmap.Ok())
    {
        return wxRect(pos.x, pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight());
    }
    else if (m_icon.Ok())
    {
        return wxRect(pos.x, pos.y, m_icon.GetWidth(), m_icon.GetHeight());
    }
    else
    {
        return wxRect(pos.x, pos.y, 0, 0);
    }
}

#endif // wxUSE_DRAGIMAGE
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: dragimgg.cpp
	3	// Purpose: Generic wxDragImage implementation
	4	// Author: Julian Smart
	5	// Modified by:
	6	// Created: 29/2/2000
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Julian Smart
	9	// Licence: wxWindows licence
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	// ============================================================================
	13	// declarations
	14	// ============================================================================
	15
	16	// ----------------------------------------------------------------------------
	17	// headers
	18	// ----------------------------------------------------------------------------
	19
	20	#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
	21	#pragma implementation "dragimgg.h"
	22	#endif
	23
	24	// For compilers that support precompilation, includes "wx.h".
	25	#include "wx/wxprec.h"
	26
	27	#ifdef __BORLANDC__
	28	#pragma hdrstop
	29	#endif
	30
	31	#if wxUSE_DRAGIMAGE
	32
	33	#ifndef WX_PRECOMP
	34	#include <stdio.h>
	35	#include "wx/setup.h"
	36	#include "wx/window.h"
	37	#include "wx/frame.h"
	38	#include "wx/dcclient.h"
	39	#include "wx/dcscreen.h"
	40	#include "wx/dcmemory.h"
	41	#include "wx/settings.h"
	42	#endif
	43
	44	#include "wx/log.h"
	45	#include "wx/intl.h"
	46
	47	#ifdef __WIN16__
	48	#define wxUSE_IMAGE_IN_DRAGIMAGE 0
	49	#else
	50	#define wxUSE_IMAGE_IN_DRAGIMAGE 1
	51	#endif
	52
	53	#if wxUSE_IMAGE_IN_DRAGIMAGE
	54	#include "wx/image.h"
	55	#endif
	56
	57	#include "wx/generic/dragimgg.h"
	58
	59	// ----------------------------------------------------------------------------
	60	// macros
	61	// ----------------------------------------------------------------------------
	62
	63	IMPLEMENT_DYNAMIC_CLASS(wxGenericDragImage, wxObject)
	64
	65	// ============================================================================
	66	// implementation
	67	// ============================================================================
	68
	69	// ----------------------------------------------------------------------------
	70	// wxGenericDragImage ctors/dtor
	71	// ----------------------------------------------------------------------------
	72
	73	wxGenericDragImage::~wxGenericDragImage()
	74	{
	75	if (m_windowDC)
	76	{
	77	delete m_windowDC;
	78	}
	79	}
	80
	81	void wxGenericDragImage::Init()
	82	{
	83	m_isDirty = FALSE;
	84	m_isShown = FALSE;
	85	m_windowDC = (wxDC*) NULL;
	86	m_window = (wxWindow*) NULL;
	87	m_fullScreen = FALSE;
	88	m_pBackingBitmap = (wxBitmap*) NULL;
	89	}
	90
	91	// Attributes
	92	////////////////////////////////////////////////////////////////////////////
	93
	94
	95	// Operations
	96	////////////////////////////////////////////////////////////////////////////
	97
	98	// Create a drag image with a virtual image (need to override DoDrawImage, GetImageRect)
	99	bool wxGenericDragImage::Create(const wxCursor& cursor)
	100	{
	101	m_cursor = cursor;
	102
	103	return TRUE;
	104	}
	105
	106	// Create a drag image from a bitmap and optional cursor
	107	bool wxGenericDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
	108	{
	109	// We don't have to combine the cursor explicitly since we simply show the cursor
	110	// as we drag. This currently will only work within one window.
	111
	112	m_cursor = cursor;
	113	m_bitmap = image;
	114
	115	return TRUE ;
	116	}
	117
	118	// Create a drag image from an icon and optional cursor
	119	bool wxGenericDragImage::Create(const wxIcon& image, const wxCursor& cursor)
	120	{
	121	// We don't have to combine the cursor explicitly since we simply show the cursor
	122	// as we drag. This currently will only work within one window.
	123
	124	m_cursor = cursor;
	125	m_icon = image;
	126
	127	return TRUE ;
	128	}
	129
	130	// Create a drag image from a string and optional cursor
	131	bool wxGenericDragImage::Create(const wxString& str, const wxCursor& cursor)
	132	{
	133	wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
	134
	135	long w, h;
	136	wxScreenDC dc;
	137	dc.SetFont(font);
	138	dc.GetTextExtent(str, & w, & h);
	139	dc.SetFont(wxNullFont);
	140
	141	wxMemoryDC dc2;
	142
	143	// Sometimes GetTextExtent isn't accurate enough, so make it longer
	144	wxBitmap bitmap((int) ((w+2) * 1.5), (int) h+2);
	145	dc2.SelectObject(bitmap);
	146
	147	dc2.SetFont(font);
	148	dc2.SetBackground(* wxWHITE_BRUSH);
	149	dc2.Clear();
	150	dc2.SetBackgroundMode(wxTRANSPARENT);
	151	dc2.SetTextForeground(* wxLIGHT_GREY);
	152	dc2.DrawText(str, 0, 0);
	153	dc2.DrawText(str, 1, 0);
	154	dc2.DrawText(str, 2, 0);
	155	dc2.DrawText(str, 1, 1);
	156	dc2.DrawText(str, 2, 1);
	157	dc2.DrawText(str, 1, 2);
	158	dc2.DrawText(str, 2, 2);
	159
	160	dc2.SetTextForeground(* wxBLACK);
	161	dc2.DrawText(str, 1, 1);
	162
	163	dc2.SelectObject(wxNullBitmap);
	164
	165	#if wxUSE_IMAGE_IN_DRAGIMAGE
	166	// Make the bitmap masked
	167	wxImage image = bitmap.ConvertToImage();
	168	image.SetMaskColour(255, 255, 255);
	169	bitmap = wxBitmap(image);
	170	#endif
	171
	172	return Create(bitmap, cursor);
	173	}
	174
	175	#if wxUSE_TREECTRL
	176	// Create a drag image for the given tree control item
	177	bool wxGenericDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
	178	{
	179	wxString str = treeCtrl.GetItemText(id);
	180	return Create(str);
	181	}
	182	#endif
	183
	184	#if wxUSE_LISTCTRL
	185	// Create a drag image for the given list control item
	186	bool wxGenericDragImage::Create(const wxListCtrl& listCtrl, long id)
	187	{
	188	wxString str = listCtrl.GetItemText(id);
	189	return Create(str);
	190	}
	191	#endif
	192
	193	// Begin drag
	194	bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot,
	195	wxWindow* window,
	196	bool fullScreen,
	197	wxRect* rect)
	198	{
	199	wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
	200
	201	// The image should be offset by this amount
	202	m_offset = hotspot;
	203	m_window = window;
	204	m_fullScreen = fullScreen;
	205
	206	if (rect)
	207	m_boundingRect = * rect;
	208
	209	m_isDirty = FALSE;
	210	m_isDirty = FALSE;
	211
	212	if (window)
	213	{
	214	window->CaptureMouse();
	215
	216	if (m_cursor.Ok())
	217	{
	218	m_oldCursor = window->GetCursor();
	219	window->SetCursor(m_cursor);
	220	}
	221	}
	222
	223	// Make a copy of the window so we can repair damage done as the image is
	224	// dragged.
	225
	226	wxSize clientSize;
	227	wxPoint pt(0, 0);
	228	if (!m_fullScreen)
	229	{
	230	clientSize = window->GetClientSize();
	231	m_boundingRect.x = 0; m_boundingRect.y = 0;
	232	m_boundingRect.width = clientSize.x; m_boundingRect.height = clientSize.y;
	233	}
	234	else
	235	{
	236	int w, h;
	237	wxDisplaySize(& w, & h);
	238	clientSize.x = w; clientSize.y = h;
	239	if (rect)
	240	{
	241	pt.x = m_boundingRect.x; pt.y = m_boundingRect.y;
	242	clientSize.x = m_boundingRect.width; clientSize.y = m_boundingRect.height;
	243	}
	244	else
	245	{
	246	m_boundingRect.x = 0; m_boundingRect.y = 0;
	247	m_boundingRect.width = w; m_boundingRect.height = h;
	248	}
	249	}
	250
	251	wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
	252
	253	if (!backing->Ok() \|\| (backing->GetWidth() < clientSize.x \|\| backing->GetHeight() < clientSize.y))
	254	(*backing) = wxBitmap(clientSize.x, clientSize.y);
	255
	256	if (!m_fullScreen)
	257	{
	258	m_windowDC = new wxClientDC(window);
	259	}
	260	else
	261	{
	262	m_windowDC = new wxScreenDC;
	263
	264	#if 0
	265	// Use m_boundingRect to limit the area considered.
	266	((wxScreenDC*) m_windowDC)->StartDrawingOnTop(rect);
	267	#endif
	268
	269	m_windowDC->SetClippingRegion(m_boundingRect.x, m_boundingRect.y,
	270	m_boundingRect.width, m_boundingRect.height);
	271	}
	272
	273	return TRUE;
	274	}
	275
	276	// Begin drag. hotspot is the location of the drag position relative to the upper-left
	277	// corner of the image. This is full screen only. fullScreenRect gives the
	278	// position of the window on the screen, to restrict the drag to.
	279	bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
	280	{
	281	wxRect rect;
	282
	283	int x = fullScreenRect->GetPosition().x;
	284	int y = fullScreenRect->GetPosition().y;
	285
	286	wxSize sz = fullScreenRect->GetSize();
	287
	288	if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
	289	fullScreenRect->GetParent()->ClientToScreen(& x, & y);
	290
	291	rect.x = x; rect.y = y;
	292	rect.width = sz.x; rect.height = sz.y;
	293
	294	return BeginDrag(hotspot, window, TRUE, & rect);
	295	}
	296
	297	// End drag
	298	bool wxGenericDragImage::EndDrag()
	299	{
	300	if (m_window)
	301	{
	302	#ifdef __WXMSW__
	303	// Under Windows we can be pretty sure this test will give
	304	// the correct results
	305	if (wxWindow::GetCapture() == m_window)
	306	#endif
	307	m_window->ReleaseMouse();
	308
	309	if (m_cursor.Ok() && m_oldCursor.Ok())
	310	{
	311	m_window->SetCursor(m_oldCursor);
	312	}
	313	}
	314
	315	if (m_windowDC)
	316	{
	317	m_windowDC->DestroyClippingRegion();
	318	delete m_windowDC;
	319	m_windowDC = (wxDC*) NULL;
	320	}
	321
	322	m_repairBitmap = wxNullBitmap;
	323
	324	return TRUE;
	325	}
	326
	327	// Move the image: call from OnMouseMove. Pt is in window client coordinates if window
	328	// is non-NULL, or in screen coordinates if NULL.
	329	bool wxGenericDragImage::Move(const wxPoint& pt)
	330	{
	331	wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Move()") );
	332
	333	wxPoint pt2(pt);
	334	if (m_fullScreen)
	335	pt2 = m_window->ClientToScreen(pt);
	336
	337	// Erase at old position, then show at the current position
	338	wxPoint oldPos = m_position;
	339
	340	bool eraseOldImage = (m_isDirty && m_isShown);
	341
	342	if (m_isShown)
	343	RedrawImage(oldPos - m_offset, pt2 - m_offset, eraseOldImage, TRUE);
	344
	345	m_position = pt2;
	346
	347	if (m_isShown)
	348	m_isDirty = TRUE;
	349
	350	return TRUE;
	351	}
	352
	353	bool wxGenericDragImage::Show()
	354	{
	355	wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Show()") );
	356
	357	// Show at the current position
	358
	359	if (!m_isShown)
	360	{
	361	// This is where we restore the backing bitmap, in case
	362	// something has changed on the window.
	363
	364	wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
	365	wxMemoryDC memDC;
	366	memDC.SelectObject(* backing);
	367
	368	UpdateBackingFromWindow(* m_windowDC, memDC, m_boundingRect, wxRect(0, 0, m_boundingRect.width, m_boundingRect.height));
	369
	370	//memDC.Blit(0, 0, m_boundingRect.width, m_boundingRect.height, m_windowDC, m_boundingRect.x, m_boundingRect.y);
	371	memDC.SelectObject(wxNullBitmap);
	372
	373	RedrawImage(m_position - m_offset, m_position - m_offset, FALSE, TRUE);
	374	}
	375
	376	m_isShown = TRUE;
	377	m_isDirty = TRUE;
	378
	379	return TRUE;
	380	}
	381
	382	bool wxGenericDragImage::UpdateBackingFromWindow(wxDC& windowDC, wxMemoryDC& destDC,
	383	const wxRect& sourceRect, const wxRect& destRect) const
	384	{
	385	return destDC.Blit(destRect.x, destRect.y, destRect.width, destRect.height, & windowDC,
	386	sourceRect.x, sourceRect.y);
	387	}
	388
	389	bool wxGenericDragImage::Hide()
	390	{
	391	wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Hide()") );
	392
	393	// Repair the old position
	394
	395	if (m_isShown && m_isDirty)
	396	{
	397	RedrawImage(m_position - m_offset, m_position - m_offset, TRUE, FALSE);
	398	}
	399
	400	m_isShown = FALSE;
	401	m_isDirty = FALSE;
	402
	403	return TRUE;
	404	}
	405
	406	// More efficient: erase and redraw simultaneously if possible
	407	bool wxGenericDragImage::RedrawImage(const wxPoint& oldPos, const wxPoint& newPos,
	408	bool eraseOld, bool drawNew)
	409	{
	410	if (!m_windowDC)
	411	return FALSE;
	412
	413	wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
	414	if (!backing->Ok())
	415	return FALSE;
	416
	417	wxRect oldRect(GetImageRect(oldPos));
	418	wxRect newRect(GetImageRect(newPos));
	419
	420	wxRect fullRect;
	421
	422	// Full rect: the combination of both rects
	423	if (eraseOld && drawNew)
	424	{
	425	int oldRight = oldRect.GetRight();
	426	int oldBottom = oldRect.GetBottom();
	427	int newRight = newRect.GetRight();
	428	int newBottom = newRect.GetBottom();
	429
	430	wxPoint topLeft = wxPoint(wxMin(oldPos.x, newPos.x), wxMin(oldPos.y, newPos.y));
	431	wxPoint bottomRight = wxPoint(wxMax(oldRight, newRight), wxMax(oldBottom, newBottom));
	432
	433	fullRect.x = topLeft.x; fullRect.y = topLeft.y;
	434	fullRect.SetRight(bottomRight.x);
	435	fullRect.SetBottom(bottomRight.y);
	436	}
	437	else if (eraseOld)
	438	fullRect = oldRect;
	439	else if (drawNew)
	440	fullRect = newRect;
	441
	442	// Make the bitmap bigger than it need be, so we don't
	443	// keep reallocating all the time.
	444	int excess = 50;
	445
	446	if (!m_repairBitmap.Ok() \|\| (m_repairBitmap.GetWidth() < fullRect.GetWidth() \|\| m_repairBitmap.GetHeight() < fullRect.GetHeight()))
	447	{
	448	m_repairBitmap = wxBitmap(fullRect.GetWidth() + excess, fullRect.GetHeight() + excess);
	449	}
	450
	451	wxMemoryDC memDC;
	452	memDC.SelectObject(* backing);
	453
	454	wxMemoryDC memDCTemp;
	455	memDCTemp.SelectObject(m_repairBitmap);
	456
	457	// Draw the backing bitmap onto the repair bitmap.
	458	// If full-screen, we may have specified the rect on the
	459	// screen that we're using for our backing bitmap.
	460	// So subtract this when we're blitting from the backing bitmap
	461	// (translate from screen to backing-bitmap coords).
	462
	463	memDCTemp.Blit(0, 0, fullRect.GetWidth(), fullRect.GetHeight(), & memDC, fullRect.x - m_boundingRect.x, fullRect.y - m_boundingRect.y);
	464
	465	// If drawing, draw the image onto the mem DC
	466	if (drawNew)
	467	{
	468	wxPoint pos(newPos.x - fullRect.x, newPos.y - fullRect.y) ;
	469	DoDrawImage(memDCTemp, pos);
	470	}
	471
	472	// Now blit to the window
	473	// Finally, blit the temp mem DC to the window.
	474	m_windowDC->Blit(fullRect.x, fullRect.y, fullRect.width, fullRect.height, & memDCTemp, 0, 0);
	475
	476	memDCTemp.SelectObject(wxNullBitmap);
	477	memDC.SelectObject(wxNullBitmap);
	478
	479	return TRUE;
	480	}
	481
	482	// Override this if you are using a virtual image (drawing your own image)
	483	bool wxGenericDragImage::DoDrawImage(wxDC& dc, const wxPoint& pos) const
	484	{
	485	if (m_bitmap.Ok())
	486	{
	487	dc.DrawBitmap(m_bitmap, pos.x, pos.y, (m_bitmap.GetMask() != 0));
	488	return TRUE;
	489	}
	490	else if (m_icon.Ok())
	491	{
	492	dc.DrawIcon(m_icon, pos.x, pos.y);
	493	return TRUE;
	494	}
	495	else
	496	return FALSE;
	497	}
	498
	499	// Override this if you are using a virtual image (drawing your own image)
	500	wxRect wxGenericDragImage::GetImageRect(const wxPoint& pos) const
	501	{
	502	if (m_bitmap.Ok())
	503	{
	504	return wxRect(pos.x, pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight());
	505	}
	506	else if (m_icon.Ok())
	507	{
	508	return wxRect(pos.x, pos.y, m_icon.GetWidth(), m_icon.GetHeight());
	509	}
	510	else
	511	{
	512	return wxRect(pos.x, pos.y, 0, 0);
	513	}
	514	}
	515
	516	#endif // wxUSE_DRAGIMAGE