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
// ----------------------------------------------------------------------------

#ifdef __GNUG__
#pragma implementation "dragimgg.h"
#endif

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#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::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));

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

    wxMemoryDC dc2;
    dc2.SetFont(font);

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

    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);
    image.SetMaskColour(255, 255, 255);
    bitmap = image.ConvertToBitmap();
#endif

    return Create(bitmap, cursor);
}

// 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);
}

// 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);
}

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