Win32 API为了让控件更为有用真是煞费苦心，不仅Tab没有提供控件可见控制，连Scroll Bar点击的时候竟然是不修改Position的，要我在每一个消息里用SBM_SETSCROLLINFO来设置当前的位置。而且当前的位置的获得还不是一致的，根据消息的不同而不同。真是故意为难人啊。
文本框里面的东西是为了检查各个消息中GetPosition函数的正确性而打出来的。输出消息的代码如下：
1 #include "..\..\..\..\VL++\Library\Windows\VL_WinGUI.h"
2
3 using namespace vl;
4 using namespace vl::windows;
5
6 class MyForm : public VL_WinForm
7 {
8 protected:
9 VL_WinScroll* FHScroll;
10 VL_WinScroll* FVScroll;
11 VL_WinEdit* FEdit;
12
13 void InitControls()
14 {
15 FHScroll=new VL_WinScroll(this,true);
16 FHScroll->Move(0,380,380,20);
17 FVScroll=new VL_WinScroll(this,false);
18 FVScroll->Move(380,0,20,380);
19 FEdit=new VL_WinEdit(this,true);
20 FEdit->Move(0,0,380,380);
21 FEdit->SetReadonly(true);
22
23 FHScroll->OnScrollMin.Bind(this,&MyForm::Scroll_ScrollMin);
24 FHScroll->OnScrollMax.Bind(this,&MyForm::Scroll_ScrollMax);
25 FHScroll->OnArrowDec.Bind(this,&MyForm::Scroll_ArrowDec);
26 FHScroll->OnArrowInc.Bind(this,&MyForm::Scroll_ArrowInc);
27 FHScroll->OnPageDec.Bind(this,&MyForm::Scroll_PageDec);
28 FHScroll->OnPageInc.Bind(this,&MyForm::Scroll_PageInc);
29 FHScroll->OnTracking.Bind(this,&MyForm::Scroll_Tracking);
30 FHScroll->OnThumbUp.Bind(this,&MyForm::Scroll_ThumbUp);
31 FHScroll->OnPositionChanged.Bind(this,&MyForm::Scroll_PositionChanged);
32 FHScroll->OnEndScroll.Bind(this,&MyForm::Scroll_EndScroll);
33
34 FVScroll->OnScrollMin.Bind(this,&MyForm::Scroll_ScrollMin);
35 FVScroll->OnScrollMax.Bind(this,&MyForm::Scroll_ScrollMax);
36 FVScroll->OnArrowDec.Bind(this,&MyForm::Scroll_ArrowDec);
37 FVScroll->OnArrowInc.Bind(this,&MyForm::Scroll_ArrowInc);
38 FVScroll->OnPageDec.Bind(this,&MyForm::Scroll_PageDec);
39 FVScroll->OnPageInc.Bind(this,&MyForm::Scroll_PageInc);
40 FVScroll->OnTracking.Bind(this,&MyForm::Scroll_Tracking);
41 FVScroll->OnThumbUp.Bind(this,&MyForm::Scroll_ThumbUp);
42 FVScroll->OnPositionChanged.Bind(this,&MyForm::Scroll_PositionChanged);
43 FVScroll->OnEndScroll.Bind(this,&MyForm::Scroll_EndScroll);
44 }
45
46 void Print(VUnicodeString Message)
47 {
48 FEdit->SetText(FEdit->GetText()+Message+L"\r\n");
49 FEdit->Select(FEdit->GetText().Length(),0);
50 FEdit->ScrollToCaret();
51 }
52
53 void Print(VL_Base* Sender , VUnicodeString Message)
54 {
55 VL_WinScroll* Scroll=dynamic_cast<VL_WinScroll*>(Sender);
56 if(Scroll)
57 {
58 if(Scroll==FHScroll)
59 {
60 Print(L"Horizontal , "+Message+L" = "+VUnicodeString(Scroll->GetPosition()));
61 }
62 else
63 {
64 Print(L"Vertical , "+Message+L" = "+VUnicodeString(Scroll->GetPosition()));
65 }
66 }
67 }
68
69 void Scroll_ScrollMin(VL_Base* Sender)
70 {
71 Print(Sender,L"Min");
72 }
73
74 void Scroll_ScrollMax(VL_Base* Sender)
75 {
76 Print(Sender,L"Max");
77 }
78
79 void Scroll_ArrowDec(VL_Base* Sender)
80 {
81 Print(Sender,L"Arrow-");
82 }
83
84 void Scroll_ArrowInc(VL_Base* Sender)
85 {
86 Print(Sender,L"Arrow+");
87 }
88
89 void Scroll_PageDec(VL_Base* Sender)
90 {
91 Print(Sender,L"Page-");
92 }
93
94 void Scroll_PageInc(VL_Base* Sender)
95 {
96 Print(Sender,L"Page+");
97 }
98
99 void Scroll_Tracking(VL_Base* Sender)
100 {
101 Print(Sender,L"Tracking");
102 }
103
104 void Scroll_ThumbUp(VL_Base* Sender)
105 {
106 Print(Sender,L"ThumbUp");
107 }
108
109 void Scroll_PositionChanged(VL_Base* Sender)
110 {
111 Print(Sender,L"Changed");
112 }
113
114 void Scroll_EndScroll(VL_Base* Sender)
115 {
116 Print(Sender,L"End");
117 }
118
119 public:
120
121 MyForm():VL_WinForm(true)
122 {
123 SetMaximizeBox(false);
124 SetBorder(vwfbSingle);
125 SetClientWidth(400);
126 SetClientHeight(400);
127 SetText(L"Vczh Form");
128 MoveCenter();
129 InitControls();
130 Show();
131 }
132 };
133
134 void main()
135 {
136 new MyForm;
137 GetApplication()->Run();
138 }
至于我是怎么解决GetPosition的呢？因为每一次操作Scroll Bar的Position都不会改，所以理所当然的，我要替它改……
1 LRESULT VL_WinScroll::ProcessMessage(UINT Message , WPARAM& wParam , LPARAM& lParam , VBool& CallDefaultProcedure)
2 {
3 LRESULT Result=0;
4 switch(Message)
5 {
6 case WM_VSCROLL_DISPATCHED:
7 case WM_HSCROLL_DISPATCHED:
8 switch(LOWORD(wParam))
9 {
10 case SB_ENDSCROLL:
11 OnEndScroll(this);
12 break;
13 case SB_LEFT:
14 OnScrollMin(this);
15 OnPositionChanged(this);
16 break;
17 case SB_RIGHT:
18 OnScrollMax(this);
19 OnPositionChanged(this);
20 break;
21 case SB_LINELEFT:
22 SetPosition(GetPosition()-1);
23 OnArrowDec(this);
24 OnPositionChanged(this);
25 break;
26 case SB_LINERIGHT:
27 SetPosition(GetPosition()+1);
28 OnArrowInc(this);
29 OnPositionChanged(this);
30 break;
31 case SB_PAGELEFT:
32 SetPosition(GetPosition()-GetPage());
33 OnPageDec(this);
34 OnPositionChanged(this);
35 break;
36 case SB_PAGERIGHT:
37 OnPageInc(this);
38 SetPosition(GetPosition()+GetPage());
39 OnPositionChanged(this);
40 break;
41 case SB_THUMBPOSITION:
42 {
43 SCROLLINFO Info;
44 GetInfo(Info);
45 SetPosition(Info.nTrackPos);
46 OnThumbUp(this);
47 OnPositionChanged(this);
48 }
49 break;
50 case SB_THUMBTRACK:
51 {
52 SCROLLINFO Info;
53 GetInfo(Info);
54 SetPosition(Info.nTrackPos);
55 OnTracking(this);
56 OnPositionChanged(this);
57 }
58 break;
59 }
60 Result=VL_WinControl::ProcessMessage(Message,wParam,lParam,CallDefaultProcedure);
61 break;
62 default:
63 Result=VL_WinControl::ProcessMessage(Message,wParam,lParam,CallDefaultProcedure);
64 }
65 return Result;
66 }
posted on 2008-08-15 06:26
陈梓瀚(vczh) 阅读(1426)
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