DragDrop Sample (C++)
This sample illustrates drag & drop within and between tree controls.
The source code is located at C:\Program Files (x86)\Softelvdm\SftTree DLL 7.5\Samples\MFC\DragDrop\Dlg.cpp or C:\Program Files\Softelvdm\SftTree DLL 7.5\Samples\MFC\DragDrop\Dlg.cpp (on 32-bit Windows versions).
/****************************************************************************/
/* SftTree/DLL 7.5 - Tree Control for C/C++ */
/* Copyright (C) 1995, 2016 Softel vdm, Inc. All Rights Reserved. */
/****************************************************************************/
#include "stdafx.h"
#include "DRAGDROP.h"
#include "Dlg.h"
/////////////////////////////////////////////////////////////////////////////
// CSampleDlg dialog
CSampleDlg::CSampleDlg(CWnd* pParent /*=NULL*/)
: CDialog(CSampleDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CSampleDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
// the remembered drop target
m_lastDropTarget = NULL;
}
void CSampleDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CSampleDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CSampleDlg, CDialog)
ON_SFTTREEN_LBUTTONDBLCLK_TEXT(IDC_LEFTTREE, OnLButtonExpandCollapseLeft)
ON_SFTTREEN_LBUTTONDOWN_BUTTON(IDC_LEFTTREE, OnLButtonExpandCollapseLeft)
ON_SFTTREEN_LBUTTONDBLCLK_BUTTON(IDC_LEFTTREE, OnLButtonExpandCollapseLeft)
ON_SFTTREEN_EXPANDALL(IDC_LEFTTREE, OnExpandAllLeft)
ON_SFTTREEN_AUTOEXPANDING(IDC_LEFTTREE, OnAutoExpandLeft)
ON_SFTTREEN_ENDDRAG(IDC_LEFTTREE, OnEndDragLeft)
ON_SFTTREEN_BEGINDRAG(IDC_LEFTTREE, OnDraggingLeft)
ON_SFTTREEN_DRAGGING(IDC_LEFTTREE, OnDraggingLeft)
ON_SFTTREEN_CANCELDRAG(IDC_LEFTTREE, OnCancelDrag)
ON_SFTTREEN_LBUTTONDBLCLK_TEXT(IDC_RIGHTTREE, OnLButtonExpandCollapseRight)
ON_SFTTREEN_LBUTTONDOWN_BUTTON(IDC_RIGHTTREE, OnLButtonExpandCollapseRight)
ON_SFTTREEN_LBUTTONDBLCLK_BUTTON(IDC_RIGHTTREE, OnLButtonExpandCollapseRight)
ON_SFTTREEN_EXPANDALL(IDC_RIGHTTREE, OnExpandAllRight)
ON_SFTTREEN_AUTOEXPANDING(IDC_RIGHTTREE, OnAutoExpandRight)
ON_SFTTREEN_ENDDRAG(IDC_RIGHTTREE, OnEndDragRight)
ON_SFTTREEN_BEGINDRAG(IDC_RIGHTTREE, OnDraggingRight)
ON_SFTTREEN_DRAGGING(IDC_RIGHTTREE, OnDraggingRight)
ON_SFTTREEN_CANCELDRAG(IDC_RIGHTTREE, OnCancelDrag)
//{{AFX_MSG_MAP(CSampleDlg)
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CSampleDlg message handlers
BOOL CSampleDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// INITIALIZE the left side tree control
/* Associate the tree control created from the dialog */
/* resource with the C++ object. */
m_LeftTree.SubclassDlgItem(IDC_LEFTTREE, this /* parent window */);
/* You could use DDX/DDV instead and add the following */
/* line to the DoDataExchange function of the tree */
/* control's parent window (remove the //). */
// DDX_Control(pDX, IDC_LEFTTREE, m_LeftTree);
m_BgBitmap.LoadBitmap(IDB_BACKGROUND);/* Load a background bitmap */
m_LeftTree.SetBackgroundBitmap(m_BgBitmap);/* Define the background bitmap */
/* Register the . These pictures are used */
/* for all items in the tree control. All three pictures */
/* must be the same size. */
{
SFT_PICTURE aPic[3];
Sft_InitPicture(&aPic[0]);
Sft_InitPicture(&aPic[1]);
Sft_InitPicture(&aPic[2]);
m_aThreeItemBitmaps[0].LoadBitmap(IDB_EXPANDABLE);/* Expandable bitmap */
Sft_SetPictureBitmap(&aPic[0], m_aThreeItemBitmaps[0]);/* Assign bitmap */
m_aThreeItemBitmaps[1].LoadBitmap(IDB_EXPANDED);/* Expanded bitmap */
Sft_SetPictureBitmap(&aPic[1], m_aThreeItemBitmaps[1]);/* Assign bitmap */
m_aThreeItemBitmaps[2].LoadBitmap(IDB_LEAF);/* bitmap */
Sft_SetPictureBitmap(&aPic[2], m_aThreeItemBitmaps[2]);/* Assign bitmap */
m_LeftTree.SetPictures(aPic); /* Use */
}
m_LeftTree.SetItemBitmapAlign(TRUE); /* Align item bitmaps */
m_LeftTree.SetTreeLineStyle(SFTTREE_TREELINE_DOT0);/* Dotted (incl. level 0) */
m_LeftTree.SetShowButtons(TRUE); /* Expand/collapse buttons (level 1..n) */
m_LeftTree.SetShowButton0(TRUE); /* Show expand/collapse buttons (level 0) */
m_LeftTree.SetButtons(SFTTREE_BUTTON_SIMPLE);/* Button style */
m_LeftTree.SetShowTruncated(TRUE); /* Show ... if truncated */
m_LeftTree.SetSelectionStyle(SFTTREE_SELECTION_CELL1);/* Select first only */
m_LeftTree.SetSelectionArea(SFTTREE_SELECTIONAREA_ALL);/* Selection changes by clicking anywhere on an item */
m_LeftTree.SetFlyby(TRUE); /* Flyby highlighting */
m_LeftTree.SetScrollTips(TRUE); /* Show Scrolltips */
m_LeftTree.SetInheritBgColor(TRUE); /* Inherit background color of first */
m_LeftTree.SetOpenEnded(TRUE); /* Last column width */
/* Define columns */
{
SFTTREE_COLUMN_EX aCol[1] = {
{ 0, 0, /* Reserved */
49, /* Width (in pixels) */
ES_LEFT, /* alignment */
ES_LEFT, /* Title style */
_T("Title"), /* Column header title */
NULL, NULL, /* Reserved field and bitmap handle */
SFTTREE_BMP_RIGHT, /* Picture alignment */
0, 0, 0, /* Reserved fields */
SFTTREE_NOCOLOR, /* background color */
SFTTREE_NOCOLOR, /* foreground color */
SFTTREE_NOCOLOR, /* Selected background color */
SFTTREE_NOCOLOR, /* Selected foreground color */
0, /* Real column position (set by SetColumns call) */
0, /* Display column number (display position) */
0, /* Column flag */
0, /* Minimum column width */
}
};
m_LeftTree.SetColumns(1, aCol); /* Set column attributes */
}
m_LeftTree.SetShowRowHeader(SFTTREE_ROWSTYLE_BUTTONCOUNT0);/* Row style */
m_LeftTree.SetRowHeaderStyle(ES_LEFT | SFTTREE_HEADER_UP);/* Row header style */
m_LeftTree.SetDragBitmaps(TRUE); /* Allow drag & drop from item, */
m_LeftTree.SetDragType(SFTTREE_DRAG_PIXELIMM);/* Select and move by a number of pixels to start drag */
m_LeftTree.SetDropHighlightStyle(SFTTREE_DROPHIGHLIGHT_BETWEEN);/* Draw line to represent drop target */
m_LeftTree.SetCharSearchMode(SFTTREE_CHARSEARCH_ALLCHARS, -1);/* Consider all characters typed */
/* Change the default colors */
{
SFTTREE_COLORS Colors;
m_LeftTree.GetCtlColors(&Colors);/* Get current color settings */
Colors.colorSelBgNoFocus = COLOR_BTNFACE | 0x80000000L;/* Selection background color (no input focus) */
Colors.colorSelFgNoFocus = COLOR_BTNTEXT | 0x80000000L;/* Selection foreground color (no input focus) */
m_LeftTree.SetCtlColors(&Colors);/* Set new colors */
}
// Add a few items
int index;
for (index = 3 ; index <= 30 ; ++index) {
int i;
CString str;
str.Format(_T("Item %d"), index-3);
i = m_LeftTree.AddString(str);
m_LeftTree.SetItemLevel(i, abs(3 - (index % 6)));
}
/* Make row header width optimal, so text and pictures are */
/* not clipped horizontally. */
m_LeftTree.MakeRowHeaderOptimal(0, FALSE);/* Make row header width optimal */
m_LeftTree.RecalcHorizontalExtent(0, FALSE);/* Update horizontal scroll bar */
// INITIALIZE the right side tree control
/* Associate the tree control created from the dialog */
/* resource with the C++ object. */
m_RightTree.SubclassDlgItem(IDC_RIGHTTREE, this /* parent window */);
/* You could use DDX/DDV instead and add the following */
/* line to the DoDataExchange function of the tree */
/* control's parent window (remove the //). */
// DDX_Control(pDX, IDC_RIGHTTREE, m_RightTree);
m_RightTree.SetTreeLineStyle(SFTTREE_TREELINE_AUTOMATIC0);/* Dotted or invisible (incl. level 0) */
m_RightTree.SetShowButtons(TRUE); /* Expand/collapse buttons (level 1..n) */
m_RightTree.SetShowButton0(TRUE); /* Show expand/collapse buttons (level 0) */
m_RightTree.SetButtons(SFTTREE_BUTTON_AUTOMATIC3);/* Automatic button style 3 */
m_RightTree.SetShowTruncated(TRUE); /* Show ... if truncated */
m_RightTree.SetShowFocus(FALSE); /* Don't show focus rectangle (caret) */
m_RightTree.SetSelectionArea(SFTTREE_SELECTIONAREA_ALL);/* Selection changes by clicking anywhere on an item */
m_RightTree.SetSelectionStyle(SFTTREE_SELECTION_CELL1 | SFTTREE_SELECTION_OUTLINE);/* Select first only using outline */
m_RightTree.SetFlyby(TRUE); /* Flyby highlighting */
m_RightTree.SetScrollTips(TRUE); /* Show Scrolltips */
m_RightTree.SetOpenEnded(TRUE); /* Last column width */
/* Define columns */
{
SFTTREE_COLUMN_EX aCol[1] = {
{ 0, 0, /* Reserved */
100, /* Width (in pixels) */
ES_LEFT, /* alignment */
ES_LEFT, /* Title style */
_T("Title"), /* Column header title */
NULL, NULL, /* Reserved field and bitmap handle */
SFTTREE_BMP_RIGHT, /* Picture alignment */
0, 0, 0, /* Reserved fields */
SFTTREE_NOCOLOR, /* background color */
SFTTREE_NOCOLOR, /* foreground color */
SFTTREE_NOCOLOR, /* Selected background color */
SFTTREE_NOCOLOR, /* Selected foreground color */
0, /* Real column position (set by SetColumns call) */
0, /* Display column number (display position) */
0, /* Column flag */
0, /* Minimum column width */
}
};
m_RightTree.SetColumns(1, aCol); /* Set column attributes */
}
m_RightTree.SetDragBitmaps(TRUE); /* Allow drag & drop from item, */
m_RightTree.SetDragType(SFTTREE_DRAG_PIXELIMM);/* Select and move by a number of pixels to start drag */
m_RightTree.SetDropHighlightStyle(SFTTREE_DROPHIGHLIGHT_ONTOP);/* Highlight drop target */
m_RightTree.SetCharSearchMode(SFTTREE_CHARSEARCH_ALLCHARS, -1);/* Consider all characters typed */
// Add a few items
for (index = 3 ; index <= 30 ; ++index) {
int i;
CString str;
str.Format(_T("Item %d"), index-3);
i = m_RightTree.AddString(str);
m_RightTree.SetItemLevel(i, abs(3 - (index % 6)));
}
m_RightTree.RecalcHorizontalExtent(0, FALSE);/* Update horizontal scroll bar */
CenterWindow();
return TRUE; // return TRUE unless you set the focus to a control
}
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
void CSampleDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CSampleDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
// LEFT SIDE TREE CONTROL EVENTS
/* Respond to expand/collapse requests as the user clicks */
/* on different tree components. The events handled here */
/* can be changed to suit your application. */
void CSampleDlg::OnLButtonExpandCollapseLeft()
{
/* get index of item to expand/collapse */
int index = m_LeftTree.GetExpandCollapseIndex();
/* get current expand/collapsed status */
BOOL fExpanded = m_LeftTree.GetItemExpand(index);
/* if control key is used we'll expand all */
BOOL fDepth = (::GetKeyState(VK_CONTROL)&0x8000);
if (fExpanded)
m_LeftTree.Collapse(index, TRUE);
else
m_LeftTree.Expand(index, TRUE, fDepth);
}
/* Respond to numeric keypad multiply key. */
void CSampleDlg::OnExpandAllLeft()
{
/* get index of item to expand/collapse */
int index = m_LeftTree.GetExpandCollapseIndex();
m_LeftTree.Expand(index, TRUE, TRUE);
}
void CSampleDlg::OnAutoExpandLeft()
{
/* get index of item to expand/collapse */
int index = m_LeftTree.GetExpandCollapseIndex();
m_LeftTree.Expand(index, TRUE, FALSE);
}
void CSampleDlg::OnEndDragLeft()
{
/* The user dropped something */
LPSFTTREE_DRAGINFO lpInfo;
int index;
CString str, text;
lpInfo = m_LeftTree.GetDragInfo();
if (lpInfo->hwnd != m_LeftTree.m_hWnd) { // The target is another window
// In this example the "other" control could be the right tree control
if (lpInfo->hwnd == m_RightTree.m_hWnd) { // target is left tree
index = m_RightTree.GetDropHighlight();
text = _T("The drop target is item %d in the right tree control");
} else {
index = -1;
text = _T("There is no valid drop target");
}
} else { // target is the right tree control
index = m_LeftTree.GetDropHighlight();
text = _T("The drop target is item %d in the left tree control");
}
// always clear drop targets. If you forget, or do it too late,
// the vertical scrolling may still be active
if (m_lastDropTarget) {
m_lastDropTarget->SetDropHighlight(-1);
m_lastDropTarget->StopAutoExpandTimer();
}
m_lastDropTarget = NULL;
str.Format(text, index);
AfxMessageBox(str);
}
void CSampleDlg::OnDraggingLeft()
{
/* Drag & drop in progress, which was started on the left side tree */
LPSFTTREE_DRAGINFO lpInfo;
lpInfo = m_LeftTree.GetDragInfo();
if (lpInfo->hwnd != m_LeftTree.m_hWnd) { // The target is another window
// clear old drop target
if (m_lastDropTarget) {
m_lastDropTarget->SetDropHighlight(-1);
m_lastDropTarget->StopAutoExpandTimer();
}
m_lastDropTarget = NULL;
// the target is another control, we have to set the cursor and
// also update the drop target
// In this example the "other" control could be the right tree control
if (lpInfo->hwnd == m_RightTree.m_hWnd) { // target is right tree
// set the drop OK cursor
lpInfo->fDropOK = TRUE;
lpInfo->hCursor = AfxGetApp()->LoadCursor(IDC_DRAG);
// update the drop target in the right tree
CPoint pt = lpInfo->ptDrag;
::MapWindowPoints(HWND_DESKTOP, m_RightTree.m_hWnd, &pt, 1);
int index = m_RightTree.CalcIndexFromPointEx(&pt);
m_RightTree.SetDropHighlight(index, TRUE);
m_RightTree.StartAutoExpandTimer(index, FALSE, 0);
// remember who is the drop target
m_lastDropTarget = &m_RightTree;
}
} else { // left side tree is the drop target
// clear old drop target if different
if (m_lastDropTarget && m_lastDropTarget != &m_LeftTree) {
m_lastDropTarget->SetDropHighlight(-1);
m_lastDropTarget->StopAutoExpandTimer();
}
m_lastDropTarget = &m_LeftTree;
m_lastDropTarget->StartAutoExpandTimer(lpInfo->index, FALSE, 0);
}
}
// RIGHT SIDE TREE CONTROL EVENTS
/* Respond to expand/collapse requests as the user clicks */
/* on different tree components. The events handled here */
/* can be changed to suit your application. */
void CSampleDlg::OnLButtonExpandCollapseRight()
{
/* get index of item to expand/collapse */
int index = m_RightTree.GetCaretIndex();
/* get current expand/collapsed status */
BOOL fExpanded = m_RightTree.GetItemExpand(index);
/* if control key is used we'll expand all */
BOOL fDepth = (::GetKeyState(VK_CONTROL)&0x8000);
if (fExpanded)
m_RightTree.Collapse(index, TRUE);
else
m_RightTree.Expand(index, TRUE, fDepth);
}
/* Respond to numeric keypad multiply key. */
void CSampleDlg::OnExpandAllRight()
{
/* get index of item to expand/collapse */
int index = m_RightTree.GetExpandCollapseIndex();
m_RightTree.Expand(index, TRUE, TRUE);
}
void CSampleDlg::OnAutoExpandRight()
{
/* get index of item to expand/collapse */
int index = m_RightTree.GetExpandCollapseIndex();
m_RightTree.Expand(index, TRUE, FALSE);
}
void CSampleDlg::OnEndDragRight()
{
/* The user dropped something */
LPSFTTREE_DRAGINFO lpInfo;
int index;
CString str, text;
lpInfo = m_RightTree.GetDragInfo();
if (lpInfo->hwnd != m_RightTree.m_hWnd) { // The target is another window
// In this example the "other" control could be the left tree control
if (lpInfo->hwnd == m_LeftTree.m_hWnd) { // target is left tree
index = m_LeftTree.GetDropHighlight();
text = _T("The drop target is item %d in the left tree control");
} else {
index = -1;
text = _T("There is no valid drop target");
}
} else { // target is the right tree control
index = m_RightTree.GetDropHighlight();
text = _T("The drop target is item %d in the right tree control");
}
// always clear drop targets. If you forget, or do it too late,
// the vertical scrolling may still be active
if (m_lastDropTarget) {
m_lastDropTarget->SetDropHighlight(-1);
m_lastDropTarget->StopAutoExpandTimer();
}
m_lastDropTarget = NULL;
str.Format(text, index);
AfxMessageBox(str);
}
void CSampleDlg::OnDraggingRight()
{
/* Drag & drop in progress, which was started on the right side tree */
LPSFTTREE_DRAGINFO lpInfo;
lpInfo = m_RightTree.GetDragInfo();
if (lpInfo->hwnd != m_RightTree.m_hWnd) { // The target is another window
// clear old drop target
if (m_lastDropTarget) {
m_lastDropTarget->SetDropHighlight(-1);
m_lastDropTarget->StopAutoExpandTimer();
}
m_lastDropTarget = NULL;
// the target is another control, we have to set the cursor and
// also update the drop target
// In this example the "other" control could be the left tree control
if (lpInfo->hwnd == m_LeftTree.m_hWnd) { // target is left tree
// set the drop OK cursor
lpInfo->fDropOK = TRUE;
lpInfo->hCursor = AfxGetApp()->LoadCursor(IDC_DRAG);
// update the drop target in the left tree
CPoint pt = lpInfo->ptDrag;
::MapWindowPoints(HWND_DESKTOP, m_LeftTree.m_hWnd, &pt, 1);
int index = m_LeftTree.CalcIndexFromPointEx(&pt);
m_LeftTree.SetDropHighlight(index, TRUE);
m_LeftTree.StartAutoExpandTimer(index, FALSE, 0);
// remember who is the drop target
m_lastDropTarget = &m_LeftTree;
}
} else { // right side tree is the drop target
// clear old drop target if different
if (m_lastDropTarget && m_lastDropTarget != &m_RightTree) {
m_lastDropTarget->SetDropHighlight(-1);
m_lastDropTarget->StopAutoExpandTimer();
}
m_lastDropTarget = &m_RightTree;
m_lastDropTarget->StartAutoExpandTimer(lpInfo->index, FALSE, 0);
}
}
void CSampleDlg::OnCancelDrag()
{
// always clear drop targets
if (m_lastDropTarget) {
m_lastDropTarget->SetDropHighlight(-1); /* Visually clear drop target */
m_lastDropTarget->StopAutoExpandTimer();
m_lastDropTarget = NULL;
}
AfxMessageBox(_T("Drag & drop cancelled."));
}
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