Everyone a great god, and I recently in the realization of the CView ScrollBar automatic hidden, when the mouse in the View area (including the scroll bar area), show the scroll bar; When the mouse leaves the View area (including the scroll bar area), automatically hide the scroll bar,

I implemented by the following way:
1, in two ScrollBar variables declared in a CTextView

 
The class CTextView: public CView {
Protected: 
//class NSbStyle inherited from CScrollBar class 
NSbStyle m_sbH m_sbV;//defines two variables ScrollBar 
Virtual void OnInitialUpdate (); 
} 

2, in CTextView OnInitialUpdate () created in m_sbH, m_sbV and initialize the two position of the ScrollBar

 
Void CTextView: : the OnInitialUpdate () 
{
SCROLLINFO info; 
Info. CbSize=sizeof (SCROLLINFO); 
Info. FMask=SIF_ALL; 
The info. The nMin=0; 
Info. NMax=100; 
Info. NPage=10; 
The info. The nPos=0; 
Info. NTrackPos=0; 

//set the position of the two ScrollBar 
CRect rcSbH, rcSbV rcClient; 
GetClientRect (rcClient); 
RcSbH. Left=rcClient. Left; 
RcSbH. Right=rcClient. Right; 
RcSbH. Top=rcClient. Bottom - H_SCROLLBAR_WIDTH; 
RcSbH. Bottom=rcClient. Bottom; 

RcSbV. Left=rcClient. Right - V_SCROLLBAR_WIDTH; 
RcSbV. Right=rcClient. Right; 
RcSbV. Top=rcClient. Top; 
RcSbV. Bottom=rcClient. Bottom - V_SCROLLBAR_WIDTH;//VScrollBar no bottom, empty space to HScrollBar 
//the ScrollBar Create still according to the given width to calculate the size of the 
M_sbH. Create (WS_CHILD | WS_VISIBLE | SBS_HORZ, rcSbH, this, NULL); 
M_sbV. Create (WS_CHILD | WS_VISIBLE | SBS_VERT, rcSbV, this, NULL); 
//Set the range, the page and position parameters in scroll bars. 
M_sbH. SetScrollInfo (& amp; Info); 
M_sbV. SetScrollInfo (& amp; Info); 
} 

3, in CTextView onm ouseMove () and onm ouseLeave () function to add a message response function
//XSB_EDRAWELEM is an enumeration variable, the enumeration of the Scrollbar state

 
Typedef enum tagXSB_EDRAWELEM 
{
ENotDrawn=0,//UI element is not visible. (UI the Rect empty). 
ENormal,//Element should be drawn in normal state. 
EHover//Element should be drawn in hover state. 
} XSB_EDRAWELEM; 
Void CTextView: onm ouseMove (UINT, CPoint point) 
{

TRACKMOUSEEVENT tme. 
Tme. CbSize=sizeof (TRACKMOUSEEVENT); 
Tme. DwFlags=TME_HOVER | TME_LEAVE; 
Tme. DwHoverTime=10; 
Tme. HwndTrack=m_hWnd; 
if (! _TrackMouseEvent (& amp; Tme)) 
_cprintf (" Track Error! \n"); 

XSB_EDRAWELEM temp_sbHStatus=eNotDrawn; 
XSB_EDRAWELEM temp_sbVStatus=eNotDrawn; 

//m_sbHStatus CTextView according to state of the horizontal scroll bar 
//the system response onm ouseMove (), which indicates that the mouse has entered into the area of the View, so show m_sbH 
If (m_sbHStatus==eNotDrawn) {
M_sbH. ShowWindow (TRUE); 
} 
//m_sbVStatus CTextView vertical scroll bar in the display status 
//the system response onm ouseMove (), which indicates that the mouse has entered into the area of the View, so show m_sbV 
If (m_sbVStatus==eNotDrawn) {
M_sbV. ShowWindow (TRUE); 
} 

CRect rt, rt_vS rt_hS; 
GetClientRect (& amp; Rt);//gets the current View of ClientRect 
M_sbV. GetWindowRect (& amp; Rt_vS);//get the View of some Wnd in the Window of the Rect 
The ScreenToClient (& amp; Rt_vS); The Window//the Rect into the coordinates of the parent Window 
M_sbH. GetWindowRect (& amp; Rt_hS);//get the View of some Wnd in the Window of the Rect 
The ScreenToClient (& amp; Rt_hS); The Window//the Rect into the coordinates of the parent Window 

//point in the View area, but is not in the horizontal scroll bar area 
If (rt) PtInRect (point) & amp; & ! Rt_hS. PtInRect (point)) {
Temp_sbHStatus=eNormal; 
} 
//point in the View area, but not in the vertical scroll bar area 
If (rt) PtInRect (point) & amp; & ! Rt_vS. PtInRect (point)) {
Temp_sbVStatus=eNormal; 
} 
//point in the View area, at the same time also in a horizontal scroll bar area 
If (rt) PtInRect (point) & amp; & Rt_hS. PtInRect (point)) {
Temp_sbHStatus=eHover; 
} 
//point in the View area, but also in the region of the vertical scroll bar 
If (rt) PtInRect (point) & amp; & Rt_vS. PtInRect (point)) {
Temp_sbVStatus=eHover; 
} 
//if the ScrollBar state changes, you will need to redraw ScrollBar; But if the state remains the same, do not need to redraw 
If ((temp_sbHStatus!=eNotDrawn) & amp; & (temp_sbHStatus!={m_sbHStatus)) 
M_sbHStatus=temp_sbHStatus; 
//DrawScrollBar (status) is a function of a state according to the drawing ScrollBar 
M_sbH. DrawScrollBar (m_sbHStatus); 
} 
//if the ScrollBar state changes, you will need to redraw ScrollBar; But if the state remains the same, do not need to redraw 
If ((temp_sbVStatus!=eNotDrawn) & amp; & (temp_sbVStatus!={m_sbVStatus)) 
M_sbVStatus=temp_sbVStatus; 
M_sbV. DrawScrollBar (m_sbVStatus); 
} 
return; 
} 
//mouse away, hide the ScrollBar, and update all state variables 
Void CTextView: : onm ouseLeave () {
M_sbHStatus=eNotDrawn; 
M_sbVStatus=eNotDrawn; 
M_sbV. ShowWindow (FALSE); 
M_sbH. ShowWindow (FALSE); 
return; 
} 

4, now the question is: 1) when the horizontal Scrollbar display, the mouse in a horizontal scroll bar area, not automatic response onm ouseLeave (), and wait until the mouse left the View area response onm ouseLeave (); 2) whether there is other way to capture the mouse can reference?

CodePudding user response:

In MFC framework, the ScrollBar CTextView ClientRect automatically out of area, is there any way to remove the default Settings? Thank you Daniel!