如何控制滚动条滑块大小?

Question

自己弄了个VScrollBar,设定好Minimum与Maximum,挂接上滚动事件，能够正确地滚动页面内容了。但有一个缺点是滑动块长度太小了，因为同样页面，如果我用系统自带的滚动条，滑动块没那么小。我尝试把SmallChange值加大，但没有效果，滑动块还是那么小。有什么办法来控制滑动块大小呢？

Answer 1

javascript做的？还是扩展windows的滚动条？

                                                                                                       reply by 阿捷  

  

Answer 2

winform 我通过IDocHostUIHandler取消了webbroser的滚动条，然后再手动给其添加(这样我可以把滚动条放在其它位置),目前问题就是滑动块太小了。
VScrollBar hsb = new VScrollBar();
void Form1_load()
{
            hsb.Width = 16;
            hsb.Height = this.panel4.Height;
            hsb.Dock = DockStyle.Right;
            hsb.SmallChange = 10;
            this.panel4.Controls.Add(hsb);
            hsb.Scroll += new ScrollEventHandler(hsb_Scroll);
            hsb.Visible = false;
}        private void extendWebBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (this.extendWebBrowser1.ReadyState == WebBrowserReadyState.Complete || this.extendWebBrowser1.ReadyState == WebBrowserReadyState.Interactive)
            {
                if (this.extendWebBrowser1.Document.Body.ScrollRectangle.Height > this.panel4.Height)
                {
                    hsb.Minimum = 0;
                    hsb.Maximum = this.extendWebBrowser1.Document.Body.ScrollRectangle.Height - this.panel4.Height;
                    hsb.Show();
                }
                else
                {
                    hsb.Hide();
                }
            }
        }//end fun        void hsb_Scroll(object sender, ScrollEventArgs e)
        {
            this.extendWebBrowser1.Document.Window.ScrollTo(new Point(0, hsb.Value));
        }//end fun

Answer 3

如果是HTML+css的好象可以用CSS来控制，
如果是WINFORM的那麻烦。

Answer 4

问题解决，原因是：
hsb.Maximum = this.extendWebBrowser1.Document.Body.ScrollRectangle.Height - this.panel4.Height;
这个值没设置好，太大了，这么改一下效果就好了：        private void extendWebBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (this.extendWebBrowser1.ReadyState == WebBrowserReadyState.Complete || this.extendWebBrowser1.ReadyState == WebBrowserReadyState.Interactive)
            {
                
                if (this.extendWebBrowser1.Document.Body.ScrollRectangle.Height > this.panel4.Height)
                {
                    hsb.Minimum = 0;
                    hsb.Maximum = (this.extendWebBrowser1.Document.Body.ScrollRectangle.Height - this.panel4.Height)/32 ;                    hsb.Show();
                }
                else
                {
                    hsb.Hide();
                }
            }
        }//end fun        void hsb_Scroll(object sender, ScrollEventArgs e)
        {
            this.extendWebBrowser1.Document.Window.ScrollTo(new Point(0, hsb.Value * 32));
        }//end fun

Answer 5

先前还试图用API解决问题，现在不需要了。不过还是把收集到的API资料贴上来，以便大家分享。

注：以下资料与本贴最终解决方案无关！仅供参考
        #region 滚动条设置API
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct SCROLLINFO
        {
            public uint cbSize;
            public uint fMask;
            public int nMin;
            public int nMax;
            public uint nPage;
            public int nPos;
            public int nTrackPos;
        }
        public enum ScrollBarInfoFlags
        {
            SIF_RANGE = 0x0001,
            SIF_PAGE = 0x0002,
            SIF_POS = 0x0004,
            SIF_DISABLENOSCROLL = 0x0008,
            SIF_TRACKPOS = 0x0010,
            SIF_ALL = (SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS)
        }
        public enum ScrollBarRequests
        {
            SB_LINEUP = 0,
            SB_LINELEFT = 0,
            SB_LINEDOWN = 1,
            SB_LINERIGHT = 1,
            SB_PAGEUP = 2,
            SB_PAGELEFT = 2,
            SB_PAGEDOWN = 3,
            SB_PAGERIGHT = 3,
            SB_THUMBPOSITION = 4,
            SB_THUMBTRACK = 5,
            SB_TOP = 6,
            SB_LEFT = 6,
            SB_BOTTOM = 7,
            SB_RIGHT = 7,
            SB_ENDSCROLL = 8
        }        private const int SB_HORZ = 0;
        private const int SB_VERT = 1;
        private const int SB_CTL = 2;
        private const int SB_BOTH = 3;        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int GetScrollInfo(IntPtr hwnd, int bar, ref SCROLLINFO si);
        [DllImport("user32")]
        public static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool Rush);
        [DllImport("user32.dll")]
        static extern int SetScrollInfo(IntPtr hwnd, int fnBar, [In] ref SCROLLINFO lpsi, bool fRedraw);
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
        #endregion