wxWidgets/samples/dragimag/dragimag.cpp
Ron Lee 11e2dfd37d renamed dragimag sample
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2000-03-14 19:47:10 +00:00

513 lines
14 KiB
C++

/////////////////////////////////////////////////////////////////////////////
// Name: dragimag.cpp
// Purpose: wxDragImage sample
// Author: Julian Smart
// Modified by:
// Created: 28/2/2000
// RCS-ID: $Id$
// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#include "wx/image.h"
// Under Windows, change this to 1
// to use wxGenericDragImage
#define wxUSE_GENERIC_DRAGIMAGE 0
#if wxUSE_GENERIC_DRAGIMAGE
#include "wx/generic/dragimgg.h"
#define wxDragImage wxGenericDragImage
#else
#include "wx/dragimag.h"
#endif
#include "dragimag.h"
#if defined(__WXGTK__) || defined(__WXMOTIF__)
#include "mondrian.xpm"
#include "dragicon.xpm"
#endif
// main program
IMPLEMENT_APP(MyApp)
// MyCanvas
IMPLEMENT_CLASS(MyCanvas, wxScrolledWindow)
BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
EVT_PAINT(MyCanvas::OnPaint)
EVT_ERASE_BACKGROUND(MyCanvas::OnEraseBackground)
EVT_MOUSE_EVENTS(MyCanvas::OnMouseEvent)
END_EVENT_TABLE()
MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
const wxPoint &pos, const wxSize &size )
: wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
{
SetBackgroundColour(* wxWHITE);
SetCursor(wxCursor(wxCURSOR_ARROW));
m_dragMode = TEST_DRAG_NONE;
m_draggedShape = (DragShape*) NULL;
m_dragImage = (wxDragImage*) NULL;
m_currentlyHighlighted = (DragShape*) NULL;
}
MyCanvas::~MyCanvas()
{
ClearShapes();
if (m_dragImage)
delete m_dragImage;
}
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
wxPaintDC dc( this );
PrepareDC( dc );
DrawShapes(dc);
}
void MyCanvas::OnEraseBackground(wxEraseEvent& event)
{
if (wxGetApp().GetBackgroundBitmap().Ok())
{
wxSize sz = GetClientSize();
wxRect rect(0, 0, sz.x, sz.y);
if (event.GetDC())
{
wxGetApp().TileBitmap(rect, *(event.GetDC()), wxGetApp().GetBackgroundBitmap());
}
else
{
wxClientDC dc(this);
wxGetApp().TileBitmap(rect, dc, wxGetApp().GetBackgroundBitmap());
}
}
else
event.Skip(); // The official way of doing it
}
void MyCanvas::OnMouseEvent(wxMouseEvent& event)
{
if (event.LeftDown())
{
DragShape* shape = FindShape(event.GetPosition());
if (shape)
{
// We tentatively start dragging, but wait for
// mouse movement before dragging properly.
m_dragMode = TEST_DRAG_START;
m_dragStartPos = event.GetPosition();
m_draggedShape = shape;
}
}
else if (event.LeftUp() && m_dragMode != TEST_DRAG_NONE)
{
// Finish dragging
m_dragMode = TEST_DRAG_NONE;
if (!m_draggedShape || !m_dragImage)
return;
wxPoint newPos(m_draggedShape->GetPosition().x + (event.GetPosition().x - m_dragStartPos.x),
m_draggedShape->GetPosition().y + (event.GetPosition().y - m_dragStartPos.y));
m_draggedShape->SetPosition(newPos);
m_dragImage->Hide();
m_dragImage->EndDrag();
delete m_dragImage;
m_dragImage = NULL;
wxClientDC dc(this);
if (m_currentlyHighlighted)
{
m_currentlyHighlighted->Draw(dc);
}
m_draggedShape->SetShow(TRUE);
m_draggedShape->Draw(dc);
m_currentlyHighlighted = (DragShape*) NULL;
m_draggedShape = (DragShape*) NULL;
}
else if (event.Dragging() && m_dragMode != TEST_DRAG_NONE)
{
if (m_dragMode == TEST_DRAG_START)
{
// We will start dragging if we've moved beyond a couple of pixels
int tolerance = 2;
int dx = abs(event.GetPosition().x - m_dragStartPos.x);
int dy = abs(event.GetPosition().y - m_dragStartPos.y);
if (dx <= tolerance && dy <= tolerance)
return;
wxPoint newPos(m_draggedShape->GetPosition().x + (event.GetPosition().x - m_dragStartPos.x),
m_draggedShape->GetPosition().y + (event.GetPosition().y - m_dragStartPos.y));
// Start the drag.
m_dragMode = TEST_DRAG_DRAGGING;
if (m_dragImage)
delete m_dragImage;
// Erase the dragged shape from the canvas
m_draggedShape->SetShow(FALSE);
wxClientDC dc(this);
EraseShape(m_draggedShape, dc);
DrawShapes(dc);
switch (m_draggedShape->GetDragMethod())
{
case SHAPE_DRAG_BITMAP:
{
wxPoint hotSpot(event.GetPosition().x - newPos.x, event.GetPosition().y - newPos.y);
m_dragImage = new wxDragImage(m_draggedShape->GetBitmap(), wxCursor(wxCURSOR_HAND), hotSpot);
break;
}
case SHAPE_DRAG_TEXT:
{
wxPoint hotSpot(event.GetPosition().x - newPos.x, event.GetPosition().y - newPos.y);
m_dragImage = new wxDragImage("Dragging some test text", wxCursor(wxCURSOR_HAND), hotSpot);
break;
}
case SHAPE_DRAG_ICON:
{
wxPoint hotSpot(event.GetPosition().x - newPos.x, event.GetPosition().y - newPos.y);
// Can anyone explain why this test is necessary,
// to prevent a gcc error?
#ifdef __WXMOTIF__
wxIcon icon(dragicon_xpm);
#else
wxIcon icon(wxICON(dragicon));
#endif
m_dragImage = new wxDragImage(icon, wxCursor(wxCURSOR_HAND), hotSpot);
break;
}
}
bool fullScreen = FALSE;
if (wxGetApp().GetUseScreen())
{
newPos = ClientToScreen(newPos);
fullScreen = TRUE;
}
bool retValue;
if (fullScreen)
// This line uses the whole screen...
retValue = m_dragImage->BeginDrag(wxPoint(0, 0), this, TRUE);
// while this line restricts dragging to the parent frame.
// retValue = m_dragImage->BeginDrag(wxPoint(0, 0), this, GetParent());
else
retValue = m_dragImage->BeginDrag(wxPoint(0, 0), this);
if (!retValue)
{
delete m_dragImage;
m_dragImage = (wxDragImage*) NULL;
m_dragMode = TEST_DRAG_NONE;
}
m_dragImage->Move(newPos);
m_dragImage->Show();
}
else if (m_dragMode == TEST_DRAG_DRAGGING)
{
// We're currently dragging. See if we're over another shape.
DragShape* onShape = FindShape(event.GetPosition());
bool mustUnhighlightOld = FALSE;
bool mustHighlightNew = FALSE;
if (m_currentlyHighlighted)
{
if ((onShape == (DragShape*) NULL) || (m_currentlyHighlighted != onShape))
mustUnhighlightOld = TRUE;
}
if (onShape && (onShape != m_currentlyHighlighted) && onShape->IsShown())
mustHighlightNew = TRUE;
if (mustUnhighlightOld || mustHighlightNew)
m_dragImage->Hide();
// Now with the drag image switched off, we can change the window contents.
if (mustUnhighlightOld)
{
wxClientDC clientDC(this);
m_currentlyHighlighted->Draw(clientDC);
m_currentlyHighlighted = (DragShape*) NULL;
}
if (mustHighlightNew)
{
wxClientDC clientDC(this);
m_currentlyHighlighted = onShape;
m_currentlyHighlighted->Draw(clientDC, wxINVERT);
}
wxPoint newPos(m_draggedShape->GetPosition().x + (event.GetPosition().x - m_dragStartPos.x),
m_draggedShape->GetPosition().y + (event.GetPosition().y - m_dragStartPos.y));
if (wxGetApp().GetUseScreen())
{
newPos = ClientToScreen(newPos);
}
// Move and show the image again
m_dragImage->Move(newPos);
if (mustUnhighlightOld || mustHighlightNew)
m_dragImage->Show();
}
}
}
void MyCanvas::DrawShapes(wxDC& dc)
{
wxNode* node = m_displayList.First();
while (node)
{
DragShape* shape = (DragShape*) node->Data();
if (shape->IsShown())
shape->Draw(dc);
node = node->Next();
}
}
void MyCanvas::EraseShape(DragShape* shape, wxDC& dc)
{
wxSize sz = GetClientSize();
wxRect rect(0, 0, sz.x, sz.y);
wxRect rect2(shape->GetRect());
dc.SetClippingRegion(rect2.x, rect2.y, rect2.width, rect2.height);
wxGetApp().TileBitmap(rect, dc, wxGetApp().GetBackgroundBitmap());
dc.DestroyClippingRegion();
}
void MyCanvas::ClearShapes()
{
wxNode* node = m_displayList.First();
while (node)
{
DragShape* shape = (DragShape*) node->Data();
delete shape;
node = node->Next();
}
m_displayList.Clear();
}
DragShape* MyCanvas::FindShape(const wxPoint& pt) const
{
wxNode* node = m_displayList.First();
while (node)
{
DragShape* shape = (DragShape*) node->Data();
if (shape->HitTest(pt))
return shape;
node = node->Next();
}
return (DragShape*) NULL;
}
// MyFrame
IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
BEGIN_EVENT_TABLE(MyFrame,wxFrame)
EVT_MENU (wxID_ABOUT, MyFrame::OnAbout)
EVT_MENU (wxID_EXIT, MyFrame::OnQuit)
END_EVENT_TABLE()
MyFrame::MyFrame()
: wxFrame( (wxFrame *)NULL, -1, "wxDragImage sample",
wxPoint(20,20), wxSize(470,360) )
{
wxMenu *file_menu = new wxMenu();
file_menu->Append( wxID_ABOUT, "&About...");
file_menu->Append( TEST_USE_SCREEN, "&Use whole screen for dragging", "Use whole screen", TRUE);
file_menu->Append( wxID_EXIT, "E&xit");
wxMenuBar *menu_bar = new wxMenuBar();
menu_bar->Append(file_menu, "&File");
SetMenuBar( menu_bar );
CreateStatusBar(2);
int widths[] = { -1, 100 };
SetStatusWidths( 2, widths );
m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
}
void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
{
Close( TRUE );
}
void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
{
(void)wxMessageBox( "wxDragImage demo\n"
"Julian Smart (c) 2000",
"About wxDragImage Demo", wxICON_INFORMATION | wxOK );
}
//-----------------------------------------------------------------------------
// MyApp
//-----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyApp, wxApp)
EVT_MENU(TEST_USE_SCREEN, MyApp::OnUseScreen)
END_EVENT_TABLE()
MyApp::MyApp()
{
// Drag across whole screen
m_useScreen = FALSE;
}
bool MyApp::OnInit()
{
#if wxUSE_LIBPNG
wxImage::AddHandler( new wxPNGHandler );
#endif
wxImage image;
if (image.LoadFile("backgrnd.png", wxBITMAP_TYPE_PNG))
{
m_background = image.ConvertToBitmap();
}
MyFrame *frame = new MyFrame();
wxString rootName("shape0");
int i;
for (i = 1; i < 4; i++)
{
wxString filename;
filename.Printf("%s%d.png", (const char*) rootName, i);
if (image.LoadFile(filename, wxBITMAP_TYPE_PNG))
{
DragShape* newShape = new DragShape(image.ConvertToBitmap());
newShape->SetPosition(wxPoint(i*50, i*50));
if (i == 2)
newShape->SetDragMethod(SHAPE_DRAG_TEXT);
else if (i == 3)
newShape->SetDragMethod(SHAPE_DRAG_ICON);
else
newShape->SetDragMethod(SHAPE_DRAG_BITMAP);
frame->GetCanvas()->GetDisplayList().Append(newShape);
}
}
#if 0
// Under Motif or GTK, this demonstrates that
// wxScreenDC only gets the root window content.
// We need to be able to copy the overall content
// for full-screen dragging to work.
int w, h;
wxDisplaySize(& w, & h);
wxBitmap bitmap(w, h);
wxScreenDC dc;
wxMemoryDC memDC;
memDC.SelectObject(bitmap);
memDC.Blit(0, 0, w, h, & dc, 0, 0);
memDC.SelectObject(wxNullBitmap);
m_background = bitmap;
#endif
frame->Show( TRUE );
return TRUE;
}
bool MyApp::TileBitmap(const wxRect& rect, wxDC& dc, wxBitmap& bitmap)
{
int w = bitmap.GetWidth();
int h = bitmap.GetHeight();
int i, j;
for (i = rect.x; i < rect.x + rect.width; i += w)
{
for (j = rect.y; j < rect.y + rect.height; j+= h)
dc.DrawBitmap(bitmap, i, j);
}
return TRUE;
}
void MyApp::OnUseScreen(wxCommandEvent& event)
{
m_useScreen = !m_useScreen;
}
// DragShape
DragShape::DragShape(const wxBitmap& bitmap)
{
m_bitmap = bitmap;
m_pos.x = 0;
m_pos.y = 0;
m_dragMethod = SHAPE_DRAG_BITMAP;
m_show = TRUE;
}
DragShape::~DragShape()
{
}
bool DragShape::HitTest(const wxPoint& pt) const
{
wxRect rect(GetRect());
return rect.Inside(pt.x, pt.y);
}
bool DragShape::Draw(wxDC& dc, int op)
{
if (m_bitmap.Ok())
{
wxMemoryDC memDC;
memDC.SelectObject(m_bitmap);
dc.Blit(m_pos.x, m_pos.y, m_bitmap.GetWidth(), m_bitmap.GetHeight(),
& memDC, 0, 0, op, TRUE);
return TRUE;
}
else
return FALSE;
}