TCM_HITTEST TCHITTESTINFO 笔记
看notepad++的源代码，其中用到了这个消息，于是查了一下
TCM_HITTEST
This message determines which tab, if any, is at a specified screen position. You can send this message explicitly or by using theTabCtrl_HitTest macro.
TCM_HITTEST wParam = 0; lParam = (LPARAM)(TC_HITTESTINFO FAR *) pinfo;
return Values
The index of the tab indicates success. –1 indicates that no tab is at the specified position.
This structure contains information about a hit test.
typedef struct _TCHITTESTINFO {
POINT pt;
UINT flags;
} TCHITTESTINFO;
Members
- pt
- Position to hit test, in client coordinates.
- flags
-
Receives the results of a hit test. The tab control sets this member to one of the following values.
Value Description TCHT_NOWHERE The position is not over a tab.位置不在一个标签上
TCHT_ONITEM The position is over a tab but not over its icon or its text. For owner-drawn tab controls, this value is specified if the position is anywhere over a tab.
在一个标签上
TCHT_ONITEMICON The position is over a tab's icon.鼠标在标签的图标上面图标 TCHT_ONITEMLABEL The position is over a tab's text.标签文本 TCHT_ONITEM is a bitwise-OR operation on TCHT_ONITEMICON and TCHT_ONITEMLABEL.
这句的意思是 TCHT_ONITEM == TCHT_ONITEMICON ||TCHT_ONITEMLABEL.
在头文件里可以找到这个定义
#define TCHT_ONITEM (TCHT_ONITEMICON|TCHT_ONITEMLABEL)
TCHITTESTINFO hitinfo;
hitinfo.pt.x = point.x;
hitinfo.pt.y = point.y;
// Find the destination tab...
int nTab = ::SendMessage(_hSelf, TCM_HITTEST, 0, (LPARAM)&hitinfo);
检测当前的鼠标位置在标签的什么地方
下面贴出notepad++的部分源码
void TabBar::exchangeItemData(POINT point)
{
TCHITTESTINFO hitinfo;
hitinfo.pt.x = point.x;
hitinfo.pt.y = point.y;
// Find the destination tab...
int nTab = ::SendMessage(_hSelf, TCM_HITTEST, 0, (LPARAM)&hitinfo);
// if(hitinfo.flags == TCHT_NOWHERE)
// {
// MessageBox(0,"TCHT_NOWHERE",0,0);
// }
if(hitinfo.flags &TCHT_ONITEM)
{
MessageBox(0,"TCHT_ONITEM",0,0);
}
else if(hitinfo.flags &TCHT_ONITEMICON)
{
MessageBox(0,"TCHT_ONITEMICON",0,0);
}
// else if(hitinfo.flags ==TCHT_ONITEMLABEL)
// {
// MessageBox(0,"TCHT_ONITEMLABEL",0,0);
// }
// else if(hitinfo.flags ==TCHT_ONITEM)
// {
// MessageBox(0,"TCHT_ONITEM",0,0);
// }
// The position is over a tab.
if (hitinfo.flags != TCHT_NOWHERE)
{
_isDraggingInside = true;
if (nTab != _nTabDragged)
{
//1. set to focus
::SendMessage(_hSelf, TCM_SETCURSEL, nTab, 0);
//2. shift their data, and insert the source
TCITEM itemData_nDraggedTab, itemData_shift;
itemData_nDraggedTab.mask = itemData_shift.mask = TCIF_IMAGE | TCIF_TEXT;
char str1[256];
char str2[256];
itemData_nDraggedTab.pszText = str1;
itemData_nDraggedTab.cchTextMax = (sizeof(str1));
itemData_shift.pszText = str2;
itemData_shift.cchTextMax = (sizeof(str2));
::SendMessage(_hSelf, TCM_GETITEM, _nTabDragged, reinterpret_cast<LPARAM>(&itemData_nDraggedTab));
if (_nTabDragged > nTab)
{
for (int i = _nTabDragged ; i > nTab ; i--)
{
::SendMessage(_hSelf, TCM_GETITEM, i-1, reinterpret_cast<LPARAM>(&itemData_shift));
::SendMessage(_hSelf, TCM_SETITEM, i, reinterpret_cast<LPARAM>(&itemData_shift));
}
}
else
{
for (int i = _nTabDragged ; i < nTab ; i++)
{
::SendMessage(_hSelf, TCM_GETITEM, i+1, reinterpret_cast<LPARAM>(&itemData_shift));
::SendMessage(_hSelf, TCM_SETITEM, i, reinterpret_cast<LPARAM>(&itemData_shift));
}
}
//
::SendMessage(_hSelf, TCM_SETITEM, nTab, reinterpret_cast<LPARAM>(&itemData_nDraggedTab));
//3. update the current index
_nTabDragged = nTab;
}
}
else
{
//::SetCursor(::LoadCursor(_hInst, MAKEINTRESOURCE(IDC_DRAG_TAB)));
_isDraggingInside = false;
}
}