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

#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;
    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.ConvertToImage();
    image.SetMaskColour(255, 255, 255);
    bitmap = wxBitmap(image);
#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)
    {
#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	#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	#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	dc2.SetFont(font);
	143
	144	// Sometimes GetTextExtent isn't accurate enough, so make it longer
	145	wxBitmap bitmap((int) ((w+2) * 1.5), (int) h+2);
	146	dc2.SelectObject(bitmap);
	147
	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	// Create a drag image for the given tree control item
	176	bool wxGenericDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
	177	{
	178	wxString str = treeCtrl.GetItemText(id);
	179	return Create(str);
	180	}
	181
	182	// Create a drag image for the given list control item
	183	bool wxGenericDragImage::Create(const wxListCtrl& listCtrl, long id)
	184	{
	185	wxString str = listCtrl.GetItemText(id);
	186	return Create(str);
	187	}
	188
	189	// Begin drag
	190	bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot,
	191	wxWindow* window,
	192	bool fullScreen,
	193	wxRect* rect)
	194	{
	195	wxASSERT_MSG( (window != 0), wxT("Window must not be null in BeginDrag."));
	196
	197	// The image should be offset by this amount
	198	m_offset = hotspot;
	199	m_window = window;
	200	m_fullScreen = fullScreen;
	201
	202	if (rect)
	203	m_boundingRect = * rect;
	204
	205	m_isDirty = FALSE;
	206	m_isDirty = FALSE;
	207
	208	if (window)
	209	{
	210	window->CaptureMouse();
	211
	212	if (m_cursor.Ok())
	213	{
	214	m_oldCursor = window->GetCursor();
	215	window->SetCursor(m_cursor);
	216	}
	217	}
	218
	219	// Make a copy of the window so we can repair damage done as the image is
	220	// dragged.
	221
	222	wxSize clientSize;
	223	wxPoint pt(0, 0);
	224	if (!m_fullScreen)
	225	{
	226	clientSize = window->GetClientSize();
	227	m_boundingRect.x = 0; m_boundingRect.y = 0;
	228	m_boundingRect.width = clientSize.x; m_boundingRect.height = clientSize.y;
	229	}
	230	else
	231	{
	232	int w, h;
	233	wxDisplaySize(& w, & h);
	234	clientSize.x = w; clientSize.y = h;
	235	if (rect)
	236	{
	237	pt.x = m_boundingRect.x; pt.y = m_boundingRect.y;
	238	clientSize.x = m_boundingRect.width; clientSize.y = m_boundingRect.height;
	239	}
	240	else
	241	{
	242	m_boundingRect.x = 0; m_boundingRect.y = 0;
	243	m_boundingRect.width = w; m_boundingRect.height = h;
	244	}
	245	}
	246
	247	wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
	248
	249	if (!backing->Ok() \|\| (backing->GetWidth() < clientSize.x \|\| backing->GetHeight() < clientSize.y))
	250	(*backing) = wxBitmap(clientSize.x, clientSize.y);
	251
	252	if (!m_fullScreen)
	253	{
	254	m_windowDC = new wxClientDC(window);
	255	}
	256	else
	257	{
	258	m_windowDC = new wxScreenDC;
	259
	260	#if 0
	261	// Use m_boundingRect to limit the area considered.
	262	((wxScreenDC*) m_windowDC)->StartDrawingOnTop(rect);
	263	#endif
	264
	265	m_windowDC->SetClippingRegion(m_boundingRect.x, m_boundingRect.y,
	266	m_boundingRect.width, m_boundingRect.height);
	267	}
	268
	269	return TRUE;
	270	}
	271
	272	// Begin drag. hotspot is the location of the drag position relative to the upper-left
	273	// corner of the image. This is full screen only. fullScreenRect gives the
	274	// position of the window on the screen, to restrict the drag to.
	275	bool wxGenericDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect)
	276	{
	277	wxRect rect;
	278
	279	int x = fullScreenRect->GetPosition().x;
	280	int y = fullScreenRect->GetPosition().y;
	281
	282	wxSize sz = fullScreenRect->GetSize();
	283
	284	if (fullScreenRect->GetParent() && !fullScreenRect->IsKindOf(CLASSINFO(wxFrame)))
	285	fullScreenRect->GetParent()->ClientToScreen(& x, & y);
	286
	287	rect.x = x; rect.y = y;
	288	rect.width = sz.x; rect.height = sz.y;
	289
	290	return BeginDrag(hotspot, window, TRUE, & rect);
	291	}
	292
	293	// End drag
	294	bool wxGenericDragImage::EndDrag()
	295	{
	296	if (m_window)
	297	{
	298	#ifdef __WXMSW__
	299	// Under Windows we can be pretty sure this test will give
	300	// the correct results
	301	if (wxWindow::GetCapture() == m_window)
	302	#endif
	303	m_window->ReleaseMouse();
	304
	305	if (m_cursor.Ok() && m_oldCursor.Ok())
	306	{
	307	m_window->SetCursor(m_oldCursor);
	308	}
	309	}
	310
	311	if (m_windowDC)
	312	{
	313	m_windowDC->DestroyClippingRegion();
	314	delete m_windowDC;
	315	m_windowDC = (wxDC*) NULL;
	316	}
	317
	318	m_repairBitmap = wxNullBitmap;
	319
	320	return TRUE;
	321	}
	322
	323	// Move the image: call from OnMouseMove. Pt is in window client coordinates if window
	324	// is non-NULL, or in screen coordinates if NULL.
	325	bool wxGenericDragImage::Move(const wxPoint& pt)
	326	{
	327	wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Move()") );
	328
	329	wxPoint pt2(pt);
	330	if (m_fullScreen)
	331	pt2 = m_window->ClientToScreen(pt);
	332
	333	// Erase at old position, then show at the current position
	334	wxPoint oldPos = m_position;
	335
	336	bool eraseOldImage = (m_isDirty && m_isShown);
	337
	338	if (m_isShown)
	339	RedrawImage(oldPos - m_offset, pt2 - m_offset, eraseOldImage, TRUE);
	340
	341	m_position = pt2;
	342
	343	if (m_isShown)
	344	m_isDirty = TRUE;
	345
	346	return TRUE;
	347	}
	348
	349	bool wxGenericDragImage::Show()
	350	{
	351	wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Show()") );
	352
	353	// Show at the current position
	354
	355	if (!m_isShown)
	356	{
	357	// This is where we restore the backing bitmap, in case
	358	// something has changed on the window.
	359
	360	wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
	361	wxMemoryDC memDC;
	362	memDC.SelectObject(* backing);
	363
	364	UpdateBackingFromWindow(* m_windowDC, memDC, m_boundingRect, wxRect(0, 0, m_boundingRect.width, m_boundingRect.height));
	365
	366	//memDC.Blit(0, 0, m_boundingRect.width, m_boundingRect.height, m_windowDC, m_boundingRect.x, m_boundingRect.y);
	367	memDC.SelectObject(wxNullBitmap);
	368
	369	RedrawImage(m_position - m_offset, m_position - m_offset, FALSE, TRUE);
	370	}
	371
	372	m_isShown = TRUE;
	373	m_isDirty = TRUE;
	374
	375	return TRUE;
	376	}
	377
	378	bool wxGenericDragImage::UpdateBackingFromWindow(wxDC& windowDC, wxMemoryDC& destDC,
	379	const wxRect& sourceRect, const wxRect& destRect) const
	380	{
	381	return destDC.Blit(destRect.x, destRect.y, destRect.width, destRect.height, & windowDC,
	382	sourceRect.x, sourceRect.y);
	383	}
	384
	385	bool wxGenericDragImage::Hide()
	386	{
	387	wxASSERT_MSG( (m_windowDC != (wxDC*) NULL), wxT("No window DC in wxGenericDragImage::Hide()") );
	388
	389	// Repair the old position
	390
	391	if (m_isShown && m_isDirty)
	392	{
	393	RedrawImage(m_position - m_offset, m_position - m_offset, TRUE, FALSE);
	394	}
	395
	396	m_isShown = FALSE;
	397	m_isDirty = FALSE;
	398
	399	return TRUE;
	400	}
	401
	402	// More efficient: erase and redraw simultaneously if possible
	403	bool wxGenericDragImage::RedrawImage(const wxPoint& oldPos, const wxPoint& newPos,
	404	bool eraseOld, bool drawNew)
	405	{
	406	if (!m_windowDC)
	407	return FALSE;
	408
	409	wxBitmap* backing = (m_pBackingBitmap ? m_pBackingBitmap : (wxBitmap*) & m_backingBitmap);
	410	if (!backing->Ok())
	411	return FALSE;
	412
	413	wxRect oldRect(GetImageRect(oldPos));
	414	wxRect newRect(GetImageRect(newPos));
	415
	416	wxRect fullRect;
	417
	418	// Full rect: the combination of both rects
	419	if (eraseOld && drawNew)
	420	{
	421	int oldRight = oldRect.GetRight();
	422	int oldBottom = oldRect.GetBottom();
	423	int newRight = newRect.GetRight();
	424	int newBottom = newRect.GetBottom();
	425
	426	wxPoint topLeft = wxPoint(wxMin(oldPos.x, newPos.x), wxMin(oldPos.y, newPos.y));
	427	wxPoint bottomRight = wxPoint(wxMax(oldRight, newRight), wxMax(oldBottom, newBottom));
	428
	429	fullRect.x = topLeft.x; fullRect.y = topLeft.y;
	430	fullRect.SetRight(bottomRight.x);
	431	fullRect.SetBottom(bottomRight.y);
	432	}
	433	else if (eraseOld)
	434	fullRect = oldRect;
	435	else if (drawNew)
	436	fullRect = newRect;
	437
	438	// Make the bitmap bigger than it need be, so we don't
	439	// keep reallocating all the time.
	440	int excess = 50;
	441
	442	if (!m_repairBitmap.Ok() \|\| (m_repairBitmap.GetWidth() < fullRect.GetWidth() \|\| m_repairBitmap.GetHeight() < fullRect.GetHeight()))
	443	{
	444	m_repairBitmap = wxBitmap(fullRect.GetWidth() + excess, fullRect.GetHeight() + excess);
	445	}
	446
	447	wxMemoryDC memDC;
	448	memDC.SelectObject(* backing);
	449
	450	wxMemoryDC memDCTemp;
	451	memDCTemp.SelectObject(m_repairBitmap);
	452
	453	// Draw the backing bitmap onto the repair bitmap.
	454	// If full-screen, we may have specified the rect on the
	455	// screen that we're using for our backing bitmap.
	456	// So subtract this when we're blitting from the backing bitmap
	457	// (translate from screen to backing-bitmap coords).
	458
	459	memDCTemp.Blit(0, 0, fullRect.GetWidth(), fullRect.GetHeight(), & memDC, fullRect.x - m_boundingRect.x, fullRect.y - m_boundingRect.y);
	460
	461	// If drawing, draw the image onto the mem DC
	462	if (drawNew)
	463	{
	464	wxPoint pos(newPos.x - fullRect.x, newPos.y - fullRect.y) ;
	465	DoDrawImage(memDCTemp, pos);
	466	}
	467
	468	// Now blit to the window
	469	// Finally, blit the temp mem DC to the window.
	470	m_windowDC->Blit(fullRect.x, fullRect.y, fullRect.width, fullRect.height, & memDCTemp, 0, 0);
	471
	472	memDCTemp.SelectObject(wxNullBitmap);
	473	memDC.SelectObject(wxNullBitmap);
	474
	475	return TRUE;
	476	}
	477
	478	// Override this if you are using a virtual image (drawing your own image)
	479	bool wxGenericDragImage::DoDrawImage(wxDC& dc, const wxPoint& pos) const
	480	{
	481	if (m_bitmap.Ok())
	482	{
	483	dc.DrawBitmap(m_bitmap, pos.x, pos.y, (m_bitmap.GetMask() != 0));
	484	return TRUE;
	485	}
	486	else if (m_icon.Ok())
	487	{
	488	dc.DrawIcon(m_icon, pos.x, pos.y);
	489	return TRUE;
	490	}
	491	else
	492	return FALSE;
	493	}
	494
	495	// Override this if you are using a virtual image (drawing your own image)
	496	wxRect wxGenericDragImage::GetImageRect(const wxPoint& pos) const
	497	{
	498	if (m_bitmap.Ok())
	499	{
	500	return wxRect(pos.x, pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight());
	501	}
	502	else if (m_icon.Ok())
	503	{
	504	return wxRect(pos.x, pos.y, m_icon.GetWidth(), m_icon.GetHeight());
	505	}
	506	else
	507	{
	508	return wxRect(pos.x, pos.y, 0, 0);
	509	}
	510	}
	511
	512	#endif // wxUSE_DRAGIMAGE