vb滚动条设置速度怎么写代码

vb滚动条设置速度怎么写代码,第1张

vb滚动条有两种改变滚动条移动速度的属性:largechange

smallchange

largechange

当用户单击滚动条上的滑动箭头和滚动滑块之间的区域时,value

属性值的该变量。

smallchange

当用户单击滚动箭头时value属性值的改变量。

两者都可以在属性窗口更改也可以在编程时设置,

比如Hscroll1Smallchange

=

2

或者

Hscroll1Largechange

=

2

1、插入文本框

2、在文本框上点右键选属性

3、设置如下参数

MultiLine = True(多来行显示,不设此项回源车不按行)

ScrollBars = 3 - fmScrollBarsBoth(滚动条,百3是水平垂直滚动条都有)

WordWrap = False(自动换行,不改此项不会出现水平滚动条,因为换行了)

4、关闭设计模式(度就是在设计模式按钮上点一下)

OK了。

水平滚动条向右滚动

dbgridperform(($0114,1,0);

水平滚动条向左滚动

dbgridperform(($0114,0,0);

垂直滚动条向下滚动

dbgridperform(($0115,1,0);

垂直滚动条向上滚动

dbgridperform(($0115,0,0);

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

WM_HSCROLL

nScrollCode = (int) LOWORD(wParam); // scroll bar value

nPos = (short int) HIWORD(wParam); // scroll box position

hwndScrollBar = (HWND) lParam; // handle of scroll bar

Parameters

nScrollCode

Value of the low-order word of wParam Specifies a scroll bar value that indicates the user's scrolling request This parameter can be one of the following values:

Value Meaning

SB_BOTTOM Scrolls to the lower right

SB_ENDSCROLL Ends scroll

SB_LINELEFT Scrolls left by one unit

SB_LINERIGHT Scrolls right by one unit

SB_PAGELEFT Scrolls left by the width of the window

SB_PAGERIGHT Scrolls right by the width of the window

SB_THUMBPOSITION Scrolls to the absolute position The current position is specified by the nPos parameter

SB_THUMBTRACK Drags scroll box to the specified position The current position is specified by the nPos parameter

SB_TOP Scrolls to the upper left

nPos

Value of the high-order word of wParam Specifies the current position of the scroll box if the nScrollCode parameter is SB_THUMBPOSITION or SB_THUMBTRACK; otherwise, nPos is not used

hwndScrollBar

Value of lParam Identifies the control if WM_HSCROLL is sent by a scroll bar control If WM_HSCROLL is sent by a window's standard scroll bar, hwndScrollBar is not used

Return Values

If an application processes this message, it should return zero

Remarks

The SB_THUMBTRACK notification message is typically used by applications that provide feedback as the user drags the scroll box

If an application scrolls the content of the window, it must also reset the position of the scroll box by using the SetScrollPos function

Note that the WM_HSCROLL message carries only 16 bits of scroll box position data Thus, applications that rely solely on WM_HSCROLL (and WM_VSCROLL) for scroll position data have a practical maximum position value of 65,535

However, because the SetScrollPos, SetScrollRange, GetScrollPos, and GetScrollRange functions support 32-bit scroll bar position data, there is a way to circumvent the 16-bit barrier of the WM_HSCROLL and WM_VSCROLL messages See GetScrollPos for a description of the technique and its limits

画一个Picture1、VScroll1、HScroll1,再在Picture1里画一个Image1。将Image1的Stretch设为False,AutoSize(如果有这个属性的话)设为True,Left、Top都设为0,要放到Image1中。将VScroll1、HScroll1的Min都设为0。

在Form_Load中打

VScroll1Max = Image1Height - Picture1ScaleHeight

HScroll1Max = Image1Width - Picture1ScaleWidth

在VScroll1的Scroll中打

Image1Top = 0 - VScroll1Value

在HScroll1的Scroll中打

Image1Left = 0 - HScroll1Value

最后要注意以上代码要求Image1中的大小必须超过Picture1所能显示的范围,而且Image1中的不宜过大,否则会报错。

QTableWidget控件可以通过两个函数内部的滚动条控件

QScrollBar verticalScrollBar() const 获得垂直滚动条控件

QScrollBar horizontalScrollBar() const 获得水平滚动条控件

滚动条控件是QScrollBar类型;

通过滚动条控件的void setValue(int)函数,可以修改滚动条的滚动位置。

注意QScrollBar的滚动位置不要超过minimum()和maximum()的范围。

1、在html中定义好一个dom标签,可以是body或者div等等。

2、给dom元素设置相应的宽度,可以用style中的width。

3、再给dom元素设置overflow属性,水平滚动条就是overflow-x:scroll。这样当元素中的内容超出设置的宽度时就会出现滚动条。

示例:

<div style="overflow-x:scroll;width:200px;white-space:nowrap;">当内容超出设定的宽度时自动出现横向滚动条</div>

  ScrollView用代码设置滚动条,通过都会设置为隐藏,实现ScrollView滚动条的隐藏,有两种方法:

  一种是在XML的ScrollView布局中加入属性android:scrollbars="none"

  另一种则是在代码中获取ScrollView后进行scrollsetVerticalScrollBarEnabled(false);

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