（八十九）c#Winform自定義控制元件-自定義滾動條（treeview、panel、datagridview、listbox、listview、textbox）
阿新 • • 發佈：2020-07-02
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前提
入行已經7,8年了，一直想做一套漂亮點的自定義控制元件，於是就有了本系列文章。
GitHub：https://github.com/kwwwvagaa/NetWinformControl
碼雲：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
如果覺得寫的還行，請點個 star 支援一下吧
歡迎前來交流探討： 企鵝群568015492
來都來了，點個【推薦】再走吧，謝謝
NuGet
Install-PackageHZH_Controls
目錄
http://www.hzhcontrols.com/blog-63.html
用處及效果
準備工作
這個是在前面滾動條上完善的，加入了對常用控制元件滾動條的美化，實現邏輯是新增一個滾動條控制元件，然後覆蓋在滾動條上面，然後實現聯動
繪製滾動條的工作，你可以參考
（六十九）c#Winform自定義控制元件-垂直滾動條-HZHControls
開始
新增一個元件ScrollbarComponent，
實現介面IExtenderProvider
Dictionary<Control, bool> m_controlCache = new Dictionary<Control, bool>();
public bool CanExtend(object extendee){
if (extendee is ScrollableControl)
{
ScrollableControl control = (ScrollableControl)extendee;
if (control.AutoScroll == true)
{
return true;
}
}
else if (extendee is TreeView){
TreeView control = (TreeView)extendee;
if (control.Scrollable)
{
return true;
}
}
else if (extendee is TextBox)
{
TextBox control = (TextBox)extendee;
if (control.Multiline && control.ScrollBars != ScrollBars.None)
{
return true;
}
}
else if (extendee is RichTextBox)
{
return true;
}
else if (extendee is ListBox)
{
return true;
}
//else if (extendee is ListView)
//{
// return true;
//}
else if (extendee is DataGridView)
{
return true;
}
return false;
}
新增擴充套件屬性
[Browsable(true), Category("自定義屬性"), Description("是否使用自定義滾動條"), DisplayName("UserCustomScrollbar"), Localizable(true)]
public bool GetUserCustomScrollbar(Control control)
{
if (m_controlCache.ContainsKey(control))
return m_controlCache[control];
return true;
}
public void SetUserCustomScrollbar(Control control, bool blnUserCustomScrollbar)
{
m_controlCache[control] = blnUserCustomScrollbar;
if (!blnUserCustomScrollbar)
return;
if (control is TreeView)
{
TreeView tv = (TreeView)control;
//tv.MouseWheel += tv_MouseWheel;
//tv.AfterSelect += tv_AfterSelect;
tv.AfterExpand += tv_AfterExpand;
tv.AfterCollapse += tv_AfterCollapse;
}
else if (control is TextBox)
{
TextBox txt = (TextBox)control;
//txt.MouseWheel += txt_MouseWheel;
txt.TextChanged += txt_TextChanged;
txt.KeyDown += txt_KeyDown;
}
else if (control is RichTextBox)
{
RichTextBox txt = (RichTextBox)control;
//txt.MouseWheel += txt_MouseWheel;
txt.TextChanged += txt_TextChanged;
txt.KeyDown += txt_KeyDown;
}
else if (control is ListBox)
{
ListBox lb = (ListBox)control;
lb.DataSourceChanged += Lb_DataSourceChanged;
lb.SelectedIndexChanged += Lb_SelectedIndexChanged;
}
//else if (control is ListView)
//{
// ListView lv = (ListView)control;
//}
else if (control is DataGridView)
{
DataGridView dgv = (DataGridView)control;
dgv.DataSourceChanged += dgv_DataSourceChanged;
dgv.RowsAdded += dgv_RowsAdded;
dgv.RowsRemoved += dgv_RowsRemoved;
dgv.Scroll += dgv_Scroll;
}
control.VisibleChanged += control_VisibleChanged;
control.SizeChanged += control_SizeChanged;
control.LocationChanged += control_LocationChanged;
control.Disposed += control_Disposed;
control.MouseWheel += Control_MouseWheel;
control_SizeChanged(control, null);
}
控制元件大小改變的時候處理滾動條顯示
void control_SizeChanged(object sender, EventArgs e)
{
if (ControlHelper.IsDesignMode())
{
return;
}
else
{
var control = sender as Control; bool blnHasVScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & VSCROLL) != ;
bool blnHasHScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & HSCROLL) != ;
if (control is TextBox)
{
var txt = (TextBox)control;
if (txt.ScrollBars == ScrollBars.Both)
{
blnHasVScrollbar = true;
blnHasHScrollbar = true;
}
else if (txt.ScrollBars == ScrollBars.Vertical)
{
blnHasVScrollbar = true;
blnHasHScrollbar = false;
}
else if (txt.ScrollBars == ScrollBars.Horizontal)
{
blnHasVScrollbar = false;
blnHasHScrollbar = true;
}
else
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
else if (control is DataGridView)
{
var dgv = (DataGridView)control;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Vertical)
{
int _height = dgv.RowTemplate.Height * dgv.Rows.Count;
if (dgv.ColumnHeadersVisible)
{
_height += dgv.ColumnHeadersHeight;
}
blnHasVScrollbar = _height > dgv.Height;
}
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Horizontal)
{
int _width = ;
foreach (DataGridViewColumn com in dgv.Columns)
{
_width += com.Width;
}
if (dgv.RowHeadersVisible)
{
_width += dgv.RowHeadersWidth;
}
blnHasHScrollbar = _width > dgv.Width;
}
}
else if (control is ListView)
{
if (!((ListView)control).Scrollable)
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
if (blnHasVScrollbar)
{
if (!m_lstVCache.ContainsKey(control))
{
if (control.Parent != null)
{
UCVScrollbar barV = new UCVScrollbar();
barV.SmallChange = ;
barV.Width = SystemInformation.VerticalScrollBarWidth + ;
barV.Scroll += barV_Scroll;
m_lstVCache[control] = barV;
if (blnHasHScrollbar)
{
barV.Height = control.Height - barV.Width;
}
else
{
barV.Height = control.Height;
}
SetVMaxNum(control);
barV.Location = new System.Drawing.Point(control.Right - barV.Width, control.Top);
control.Parent.Controls.Add(barV);
int intControlIndex = control.Parent.Controls.GetChildIndex(control);
control.Parent.Controls.SetChildIndex(barV, intControlIndex);
}
}
else
{
if (blnHasHScrollbar)
{
m_lstVCache[control].Height = control.Height - m_lstVCache[control].Width;
}
else
{
m_lstVCache[control].Height = control.Height;
}
SetVMaxNum(control);
}
}
else
{
if (m_lstVCache.ContainsKey(control) && m_lstVCache[control].Parent != null)
{
m_lstVCache[control].Visible = false;
}
} if (blnHasHScrollbar)
{
if (!m_lstHCache.ContainsKey(control))
{
if (control.Parent != null)
{
UCHScrollbar barH = new UCHScrollbar();
barH.Height = SystemInformation.HorizontalScrollBarHeight + ;
barH.SmallChange = ; barH.Scroll += barH_Scroll;
m_lstHCache[control] = barH;
if (blnHasHScrollbar)
{
barH.Width = control.Width - barH.Height;
}
else
{
barH.Width = control.Width;
}
SetHMaxNum(control);
barH.Location = new System.Drawing.Point(control.Left, control.Bottom - barH.Height);
control.Parent.Controls.Add(barH);
int intControlIndex = control.Parent.Controls.GetChildIndex(control);
control.Parent.Controls.SetChildIndex(barH, intControlIndex);
}
}
else
{
if (blnHasHScrollbar)
{
m_lstHCache[control].Width = control.Width - m_lstHCache[control].Height;
}
else
{
m_lstHCache[control].Width = control.Width;
}
SetHMaxNum(control);
}
}
else
{
if (m_lstHCache.ContainsKey(control))
{
if (m_lstHCache[control].Visible && m_lstHCache[control].Parent != null)
{
m_lstHCache[control].Visible = false;
}
}
}
}
ResetScrollLocation(sender);
}
修改橫豎滾動條值
private void SetVMaxNum(Control control)
{
if (!m_lstVCache.ContainsKey(control))
return;
var intoV = ControlHelper.GetVScrollBarInfo(control.Handle);
UCVScrollbar barV = m_lstVCache[control];
if (control is ScrollableControl)
{
barV.Maximum = intoV.ScrollMax;
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos;
barV.BringToFront();
// barV.Maximum = (control as ScrollableControl).VerticalScroll.Maximum;
// barV.Value = (control as ScrollableControl).VerticalScroll.Value;
}
else if (control is TreeView)
{
var tv = control as TreeView;
barV.Maximum = intoV.ScrollMax * tv.ItemHeight;
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos * tv.ItemHeight;
barV.BringToFront(); //barV.Maximum = GetTreeNodeMaxY(control as TreeView) - control.Height;
//barV.Value = (control as TreeView).AutoScrollOffset.Y;
}
else if (control is TextBox)
{
TextBox txt = (TextBox)control;
barV.Maximum = intoV.ScrollMax * txt.PreferredHeight;
if (txt.ScrollBars == ScrollBars.Both || txt.ScrollBars == ScrollBars.Vertical)
{
barV.Visible = true;
}
else
{
barV.Visible = false;
}
barV.Value = intoV.nPos * txt.PreferredHeight;
barV.BringToFront();
}
else if (control is RichTextBox)
{
bool blnHasVScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & VSCROLL) != ;
barV.Maximum = intoV.ScrollMax;
barV.Visible = blnHasVScrollbar;
barV.Value = intoV.nPos;
barV.BringToFront();
}
else if (control is ListBox)
{
var lb = control as ListBox;
if (intoV.ScrollMax <= )
{
var v = lb.ItemHeight * lb.Items.Count - lb.Height;
if (v > )
barV.Maximum = v;
else
barV.Maximum = intoV.ScrollMax * lb.ItemHeight;
}
else
{
barV.Maximum = intoV.ScrollMax * lb.ItemHeight;
}
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos * lb.ItemHeight;
barV.BringToFront();
}
else if (control is ListView)
{
barV.Maximum = intoV.ScrollMax;
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos;
barV.BringToFront();
}
else if (control is DataGridView)
{
bool blnHasVScrollbar = false;
var dgv = (DataGridView)control;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Vertical)
{
int _height = dgv.RowTemplate.Height * dgv.Rows.Count;
if (dgv.ColumnHeadersVisible)
{
_height += dgv.ColumnHeadersHeight;
}
blnHasVScrollbar = _height > dgv.Height;
}
barV.Maximum = dgv.Rows.Count;
barV.Visible = blnHasVScrollbar;
barV.Value = dgv.FirstDisplayedScrollingRowIndex; ;
barV.BringToFront();
}
}
private void SetHMaxNum(Control control)
{
if (!m_lstHCache.ContainsKey(control))
return;
var intoH = ControlHelper.GetHScrollBarInfo(control.Handle);
UCHScrollbar barH = m_lstHCache[control];
if (control is ScrollableControl)
{
barH.Maximum = intoH.ScrollMax;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos;
barH.BringToFront(); //barH.Maximum = (control as ScrollableControl).HorizontalScroll.Maximum;
//barH.Value = (control as ScrollableControl).HorizontalScroll.Value;
}
else if (control is TreeView)
{
var tv = control as TreeView;
barH.Maximum = intoH.ScrollMax;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos;
barH.BringToFront();
//barH.Maximum = GetTreeNodeMaxX(control as TreeView);
//barH.Value = (control as TreeView).AutoScrollOffset.X;
}
else if (control is TextBox)
{
TextBox txt = (TextBox)control;
barH.Maximum = intoH.ScrollMax; if (txt.ScrollBars == ScrollBars.Both || txt.ScrollBars == ScrollBars.Horizontal)
{
barH.Visible = true;
}
else
{
barH.Visible = false;
} barH.Value = intoH.nPos;
barH.BringToFront();
}
else if (control is RichTextBox)
{
bool blnHasHScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & HSCROLL) != ; barH.Maximum = intoH.ScrollMax;
barH.Visible = blnHasHScrollbar;
barH.Value = intoH.nPos;
barH.BringToFront();
}
else if (control is ListBox)
{
var lb = control as ListBox;
barH.Maximum = intoH.ScrollMax * lb.ItemHeight;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos * lb.ItemHeight;
barH.BringToFront();
}
else if (control is ListView)
{
barH.Maximum = intoH.ScrollMax;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos;
barH.BringToFront();
}
else if (control is DataGridView)
{
bool blnHasHScrollbar = false;
var dgv = (DataGridView)control;
int _width = ;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Horizontal)
{
foreach (DataGridViewColumn com in dgv.Columns)
{
_width += com.Width;
}
if (dgv.RowHeadersVisible)
{
_width += dgv.RowHeadersWidth;
}
blnHasHScrollbar = _width > dgv.Width;
}
if (blnHasHScrollbar)
barH.Maximum = _width - dgv.Width;
barH.Visible = blnHasHScrollbar;
barH.Value = dgv.FirstDisplayedScrollingColumnHiddenWidth;
barH.BringToFront();
}
}
位置改變時候修改滾動條
private void ResetScrollLocation(object sender)
{
Control control = (Control)sender;
bool blnHasVScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & VSCROLL) != ;
bool blnHasHScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & HSCROLL) != ;
if (control is TextBox)
{
var txt = (TextBox)control;
if (txt.ScrollBars == ScrollBars.Both)
{
blnHasVScrollbar = true;
blnHasHScrollbar = true;
}
else if (txt.ScrollBars == ScrollBars.Vertical)
{
blnHasVScrollbar = true;
blnHasHScrollbar = false;
}
else if (txt.ScrollBars == ScrollBars.Horizontal)
{
blnHasVScrollbar = false;
blnHasHScrollbar = true;
}
else
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
else if (control is DataGridView)
{
var dgv = (DataGridView)control;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Vertical)
{
int _height = dgv.RowTemplate.Height * dgv.Rows.Count;
if (dgv.ColumnHeadersVisible)
{
_height += dgv.ColumnHeadersHeight;
}
blnHasVScrollbar = _height > dgv.Height;
}
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Horizontal)
{
int _width = ;
foreach (DataGridViewColumn com in dgv.Columns)
{
_width += com.Width;
}
if (dgv.RowHeadersVisible)
{
_width += dgv.RowHeadersWidth;
}
blnHasHScrollbar = _width > dgv.Width;
}
}
else if (control is ListView)
{
if (!((ListView)control).Scrollable)
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
if (control.Visible)
{
if (m_lstVCache.ContainsKey(control))
{
m_lstVCache[control].Location = new System.Drawing.Point(control.Right - m_lstVCache[control].Width, control.Top);
if (blnHasHScrollbar)
{
m_lstVCache[control].Height = control.Height - m_lstHCache[control].Height;
}
else
{
m_lstVCache[control].Height = control.Height;
}
SetVMaxNum(control);
} if (m_lstHCache.ContainsKey(control))
{
m_lstHCache[control].Location = new System.Drawing.Point(control.Left, control.Bottom - m_lstHCache[control].Height);
//if (blnHasVScrollbar)
//{
// m_lstHCache[control].Width = control.Width - m_lstVCache[control].Width;
//}
//else
//{
m_lstHCache[control].Width = control.Width;
//}
SetHMaxNum(control);
}
}
}
滑動滾動條的處理滾動
void barV_Scroll(object sender, EventArgs e)
{
UCVScrollbar bar = (UCVScrollbar)sender;
if (m_lstVCache.ContainsValue(bar))
{
Control c = m_lstVCache.FirstOrDefault(p => p.Value == bar).Key; //ControlHelper.SetVScrollValue(c.Handle, bar.Value);
if (c is ScrollableControl)
{
(c as ScrollableControl).AutoScrollPosition = new Point((c as ScrollableControl).AutoScrollPosition.X, bar.Value);
}
else if (c is TreeView)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value / ((c as TreeView).ItemHeight));
}
else if (c is TextBox)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value / ((c as TextBox).PreferredHeight));
}
else if (c is RichTextBox)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value);
}
else if (c is ListBox)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value / ((c as ListBox).ItemHeight));
}
else if (c is ListView)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value);
}
else if (c is DataGridView)
{
var dgv = (DataGridView)c;
if(bar.Value>)
dgv.FirstDisplayedScrollingRowIndex = bar.Value - ;
}
}
} void barH_Scroll(object sender, EventArgs e)
{
UCHScrollbar bar = (UCHScrollbar)sender;
if (m_lstHCache.ContainsValue(bar))
{
Control c = m_lstHCache.FirstOrDefault(p => p.Value == bar).Key;
if (c is ScrollableControl)
{
(c as ScrollableControl).AutoScrollPosition = new Point(bar.Value, (c as ScrollableControl).AutoScrollPosition.Y);
}
else if (c is TreeView)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
//TreeView tv = (c as TreeView);
//SetTreeViewVScrollLocation(tv, tv.Nodes, bar.Value);
}
else if (c is TextBox)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
//TextBox txt = (c as TextBox);
//SetTextBoxVScrollLocation(txt, bar.Value);
}
else if (c is RichTextBox)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
}
else if (c is ListBox)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
}
else if (c is ListView)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
}
else if (c is DataGridView)
{
var dgv = (DataGridView)c;
dgv.HorizontalScrollingOffset = bar.Value;
}
}
}
以下是全部程式碼
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms; namespace HZH_Controls.Controls
{
[ProvideProperty("UserCustomScrollbar", typeof(Control))]
public class ScrollbarComponent : Component, IExtenderProvider
{
public ScrollbarComponent()
{ } public ScrollbarComponent(IContainer container)
{
container.Add(this);
} Dictionary<Control, bool> m_controlCache = new Dictionary<Control, bool>();
public bool CanExtend(object extendee)
{
if (extendee is ScrollableControl)
{
ScrollableControl control = (ScrollableControl)extendee;
if (control.AutoScroll == true)
{
return true;
}
}
else if (extendee is TreeView)
{
TreeView control = (TreeView)extendee;
if (control.Scrollable)
{
return true;
}
}
else if (extendee is TextBox)
{
TextBox control = (TextBox)extendee;
if (control.Multiline && control.ScrollBars != ScrollBars.None)
{
return true;
}
}
else if (extendee is RichTextBox)
{
return true;
}
else if (extendee is ListBox)
{
return true;
}
//else if (extendee is ListView)
//{
// return true;
//}
else if (extendee is DataGridView)
{
return true;
}
return false;
} [Browsable(true), Category("自定義屬性"), Description("是否使用自定義滾動條"), DisplayName("UserCustomScrollbar"), Localizable(true)]
public bool GetUserCustomScrollbar(Control control)
{
if (m_controlCache.ContainsKey(control))
return m_controlCache[control];
return true;
} public void SetUserCustomScrollbar(Control control, bool blnUserCustomScrollbar)
{
m_controlCache[control] = blnUserCustomScrollbar;
if (!blnUserCustomScrollbar)
return; if (control is TreeView)
{
TreeView tv = (TreeView)control;
//tv.MouseWheel += tv_MouseWheel;
//tv.AfterSelect += tv_AfterSelect;
tv.AfterExpand += tv_AfterExpand;
tv.AfterCollapse += tv_AfterCollapse;
}
else if (control is TextBox)
{
TextBox txt = (TextBox)control;
//txt.MouseWheel += txt_MouseWheel;
txt.TextChanged += txt_TextChanged;
txt.KeyDown += txt_KeyDown;
}
else if (control is RichTextBox)
{
RichTextBox txt = (RichTextBox)control;
//txt.MouseWheel += txt_MouseWheel;
txt.TextChanged += txt_TextChanged;
txt.KeyDown += txt_KeyDown;
}
else if (control is ListBox)
{
ListBox lb = (ListBox)control;
lb.DataSourceChanged += Lb_DataSourceChanged;
lb.SelectedIndexChanged += Lb_SelectedIndexChanged;
}
//else if (control is ListView)
//{
// ListView lv = (ListView)control; //}
else if (control is DataGridView)
{
DataGridView dgv = (DataGridView)control;
dgv.DataSourceChanged += dgv_DataSourceChanged;
dgv.RowsAdded += dgv_RowsAdded;
dgv.RowsRemoved += dgv_RowsRemoved;
dgv.Scroll += dgv_Scroll;
} control.VisibleChanged += control_VisibleChanged;
control.SizeChanged += control_SizeChanged;
control.LocationChanged += control_LocationChanged;
control.Disposed += control_Disposed;
control.MouseWheel += Control_MouseWheel;
control_SizeChanged(control, null);
} void dgv_Scroll(object sender, ScrollEventArgs e)
{
if (e.NewValue == e.OldValue)
return;
DataGridView dgv = (DataGridView)sender;
if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
if (m_lstHCache.ContainsKey(dgv))
{
m_lstHCache[dgv].Value = e.NewValue;
}
}
else if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
{
if (m_lstVCache.ContainsKey(dgv))
{
m_lstVCache[dgv].Value = e.NewValue;
}
}
} void dgv_RowsRemoved(object sender, DataGridViewRowsRemovedEventArgs e)
{
Control control = sender as Control;
control_SizeChanged(control, null);
} void dgv_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
{
Control control = sender as Control;
control_SizeChanged(control, null);
} void dgv_DataSourceChanged(object sender, EventArgs e)
{
Control control = sender as Control;
control_SizeChanged(control, null);
} private void Lb_SelectedIndexChanged(object sender, EventArgs e)
{
Control c = sender as Control;
SetVMaxNum(c);
} private void Lb_DataSourceChanged(object sender, EventArgs e)
{
Control c = sender as Control;
control_SizeChanged(c, null);
} private void Control_MouseWheel(object sender, MouseEventArgs e)
{
Control c = (Control)sender;
if (m_lstVCache.ContainsKey(c))
{
if (e.Delta > )
{
ControlHelper.ScrollUp(c.Handle);
}
else if (e.Delta < -)
{
ControlHelper.ScrollDown(c.Handle);
} SetVMaxNum(c);
}
else if (m_lstHCache.ContainsKey(c))
{
if (e.Delta > )
{
ControlHelper.ScrollLeft(c.Handle);
}
else if (e.Delta < -)
{
ControlHelper.ScrollRight(c.Handle);
} SetHMaxNum(c);
}
} void control_Disposed(object sender, EventArgs e)
{
Control control = (Control)sender;
if (m_lstVCache.ContainsKey(control) && m_lstVCache[control].Parent != null)
{
m_lstVCache[control].Parent.Controls.Remove(m_lstVCache[control]);
m_lstVCache.Remove(control);
}
} void control_LocationChanged(object sender, EventArgs e)
{
ResetScrollLocation(sender);
} void control_SizeChanged(object sender, EventArgs e)
{
if (ControlHelper.IsDesignMode())
{
return;
}
else
{
var control = sender as Control; bool blnHasVScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & VSCROLL) != ;
bool blnHasHScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & HSCROLL) != ;
if (control is TextBox)
{
var txt = (TextBox)control;
if (txt.ScrollBars == ScrollBars.Both)
{
blnHasVScrollbar = true;
blnHasHScrollbar = true;
}
else if (txt.ScrollBars == ScrollBars.Vertical)
{
blnHasVScrollbar = true;
blnHasHScrollbar = false;
}
else if (txt.ScrollBars == ScrollBars.Horizontal)
{
blnHasVScrollbar = false;
blnHasHScrollbar = true;
}
else
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
else if (control is DataGridView)
{
var dgv = (DataGridView)control;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Vertical)
{
int _height = dgv.RowTemplate.Height * dgv.Rows.Count;
if (dgv.ColumnHeadersVisible)
{
_height += dgv.ColumnHeadersHeight;
}
blnHasVScrollbar = _height > dgv.Height;
}
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Horizontal)
{
int _width = ;
foreach (DataGridViewColumn com in dgv.Columns)
{
_width += com.Width;
}
if (dgv.RowHeadersVisible)
{
_width += dgv.RowHeadersWidth;
}
blnHasHScrollbar = _width > dgv.Width;
}
}
else if (control is ListView)
{
if (!((ListView)control).Scrollable)
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
if (blnHasVScrollbar)
{
if (!m_lstVCache.ContainsKey(control))
{
if (control.Parent != null)
{
UCVScrollbar barV = new UCVScrollbar();
barV.SmallChange = ;
barV.Width = SystemInformation.VerticalScrollBarWidth + ;
barV.Scroll += barV_Scroll;
m_lstVCache[control] = barV;
if (blnHasHScrollbar)
{
barV.Height = control.Height - barV.Width;
}
else
{
barV.Height = control.Height;
}
SetVMaxNum(control);
barV.Location = new System.Drawing.Point(control.Right - barV.Width, control.Top);
control.Parent.Controls.Add(barV);
int intControlIndex = control.Parent.Controls.GetChildIndex(control);
control.Parent.Controls.SetChildIndex(barV, intControlIndex);
}
}
else
{
if (blnHasHScrollbar)
{
m_lstVCache[control].Height = control.Height - m_lstVCache[control].Width;
}
else
{
m_lstVCache[control].Height = control.Height;
}
SetVMaxNum(control);
}
}
else
{
if (m_lstVCache.ContainsKey(control) && m_lstVCache[control].Parent != null)
{
m_lstVCache[control].Visible = false;
}
} if (blnHasHScrollbar)
{
if (!m_lstHCache.ContainsKey(control))
{
if (control.Parent != null)
{
UCHScrollbar barH = new UCHScrollbar();
barH.Height = SystemInformation.HorizontalScrollBarHeight + ;
barH.SmallChange = ; barH.Scroll += barH_Scroll;
m_lstHCache[control] = barH;
if (blnHasHScrollbar)
{
barH.Width = control.Width - barH.Height;
}
else
{
barH.Width = control.Width;
}
SetHMaxNum(control);
barH.Location = new System.Drawing.Point(control.Left, control.Bottom - barH.Height);
control.Parent.Controls.Add(barH);
int intControlIndex = control.Parent.Controls.GetChildIndex(control);
control.Parent.Controls.SetChildIndex(barH, intControlIndex);
}
}
else
{
if (blnHasHScrollbar)
{
m_lstHCache[control].Width = control.Width - m_lstHCache[control].Height;
}
else
{
m_lstHCache[control].Width = control.Width;
}
SetHMaxNum(control);
}
}
else
{
if (m_lstHCache.ContainsKey(control))
{
if (m_lstHCache[control].Visible && m_lstHCache[control].Parent != null)
{
m_lstHCache[control].Visible = false;
}
}
}
}
ResetScrollLocation(sender);
} private void SetVMaxNum(Control control)
{
if (!m_lstVCache.ContainsKey(control))
return;
var intoV = ControlHelper.GetVScrollBarInfo(control.Handle);
UCVScrollbar barV = m_lstVCache[control];
if (control is ScrollableControl)
{
barV.Maximum = intoV.ScrollMax;
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos;
barV.BringToFront();
// barV.Maximum = (control as ScrollableControl).VerticalScroll.Maximum;
// barV.Value = (control as ScrollableControl).VerticalScroll.Value;
}
else if (control is TreeView)
{
var tv = control as TreeView;
barV.Maximum = intoV.ScrollMax * tv.ItemHeight;
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos * tv.ItemHeight;
barV.BringToFront(); //barV.Maximum = GetTreeNodeMaxY(control as TreeView) - control.Height;
//barV.Value = (control as TreeView).AutoScrollOffset.Y;
}
else if (control is TextBox)
{
TextBox txt = (TextBox)control;
barV.Maximum = intoV.ScrollMax * txt.PreferredHeight;
if (txt.ScrollBars == ScrollBars.Both || txt.ScrollBars == ScrollBars.Vertical)
{
barV.Visible = true;
}
else
{
barV.Visible = false;
}
barV.Value = intoV.nPos * txt.PreferredHeight;
barV.BringToFront();
}
else if (control is RichTextBox)
{
bool blnHasVScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & VSCROLL) != ;
barV.Maximum = intoV.ScrollMax;
barV.Visible = blnHasVScrollbar;
barV.Value = intoV.nPos;
barV.BringToFront();
}
else if (control is ListBox)
{
var lb = control as ListBox;
if (intoV.ScrollMax <= )
{
var v = lb.ItemHeight * lb.Items.Count - lb.Height;
if (v > )
barV.Maximum = v;
else
barV.Maximum = intoV.ScrollMax * lb.ItemHeight;
}
else
{
barV.Maximum = intoV.ScrollMax * lb.ItemHeight;
}
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos * lb.ItemHeight;
barV.BringToFront();
}
else if (control is ListView)
{
barV.Maximum = intoV.ScrollMax;
barV.Visible = intoV.ScrollMax > && intoV.nMax > && intoV.nPage > ;
barV.Value = intoV.nPos;
barV.BringToFront();
}
else if (control is DataGridView)
{
bool blnHasVScrollbar = false;
var dgv = (DataGridView)control;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Vertical)
{
int _height = dgv.RowTemplate.Height * dgv.Rows.Count;
if (dgv.ColumnHeadersVisible)
{
_height += dgv.ColumnHeadersHeight;
}
blnHasVScrollbar = _height > dgv.Height;
}
barV.Maximum = dgv.Rows.Count;
barV.Visible = blnHasVScrollbar;
barV.Value = dgv.FirstDisplayedScrollingRowIndex; ;
barV.BringToFront();
}
}
private void SetHMaxNum(Control control)
{
if (!m_lstHCache.ContainsKey(control))
return;
var intoH = ControlHelper.GetHScrollBarInfo(control.Handle);
UCHScrollbar barH = m_lstHCache[control];
if (control is ScrollableControl)
{
barH.Maximum = intoH.ScrollMax;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos;
barH.BringToFront(); //barH.Maximum = (control as ScrollableControl).HorizontalScroll.Maximum;
//barH.Value = (control as ScrollableControl).HorizontalScroll.Value;
}
else if (control is TreeView)
{
var tv = control as TreeView;
barH.Maximum = intoH.ScrollMax;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos;
barH.BringToFront();
//barH.Maximum = GetTreeNodeMaxX(control as TreeView);
//barH.Value = (control as TreeView).AutoScrollOffset.X;
}
else if (control is TextBox)
{
TextBox txt = (TextBox)control;
barH.Maximum = intoH.ScrollMax; if (txt.ScrollBars == ScrollBars.Both || txt.ScrollBars == ScrollBars.Horizontal)
{
barH.Visible = true;
}
else
{
barH.Visible = false;
} barH.Value = intoH.nPos;
barH.BringToFront();
}
else if (control is RichTextBox)
{
bool blnHasHScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & HSCROLL) != ; barH.Maximum = intoH.ScrollMax;
barH.Visible = blnHasHScrollbar;
barH.Value = intoH.nPos;
barH.BringToFront();
}
else if (control is ListBox)
{
var lb = control as ListBox;
barH.Maximum = intoH.ScrollMax * lb.ItemHeight;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos * lb.ItemHeight;
barH.BringToFront();
}
else if (control is ListView)
{
barH.Maximum = intoH.ScrollMax;
barH.Visible = intoH.ScrollMax > && intoH.nMax > && intoH.nPage > ;
barH.Value = intoH.nPos;
barH.BringToFront();
}
else if (control is DataGridView)
{
bool blnHasHScrollbar = false;
var dgv = (DataGridView)control;
int _width = ;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Horizontal)
{
foreach (DataGridViewColumn com in dgv.Columns)
{
_width += com.Width;
}
if (dgv.RowHeadersVisible)
{
_width += dgv.RowHeadersWidth;
}
blnHasHScrollbar = _width > dgv.Width;
}
if (blnHasHScrollbar)
barH.Maximum = _width - dgv.Width;
barH.Visible = blnHasHScrollbar;
barH.Value = dgv.FirstDisplayedScrollingColumnHiddenWidth;
barH.BringToFront();
}
}
/// <summary>
/// Resets the v scroll location.
/// </summary>
/// <param name="sender">The sender.</param>
private void ResetScrollLocation(object sender)
{
Control control = (Control)sender;
bool blnHasVScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & VSCROLL) != ;
bool blnHasHScrollbar = control.IsHandleCreated && (ControlHelper.GetWindowLong(control.Handle, STYLE) & HSCROLL) != ;
if (control is TextBox)
{
var txt = (TextBox)control;
if (txt.ScrollBars == ScrollBars.Both)
{
blnHasVScrollbar = true;
blnHasHScrollbar = true;
}
else if (txt.ScrollBars == ScrollBars.Vertical)
{
blnHasVScrollbar = true;
blnHasHScrollbar = false;
}
else if (txt.ScrollBars == ScrollBars.Horizontal)
{
blnHasVScrollbar = false;
blnHasHScrollbar = true;
}
else
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
else if (control is DataGridView)
{
var dgv = (DataGridView)control;
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Vertical)
{
int _height = dgv.RowTemplate.Height * dgv.Rows.Count;
if (dgv.ColumnHeadersVisible)
{
_height += dgv.ColumnHeadersHeight;
}
blnHasVScrollbar = _height > dgv.Height;
}
if (dgv.ScrollBars == ScrollBars.Both || dgv.ScrollBars == ScrollBars.Horizontal)
{
int _width = ;
foreach (DataGridViewColumn com in dgv.Columns)
{
_width += com.Width;
}
if (dgv.RowHeadersVisible)
{
_width += dgv.RowHeadersWidth;
}
blnHasHScrollbar = _width > dgv.Width;
}
}
else if (control is ListView)
{
if (!((ListView)control).Scrollable)
{
blnHasVScrollbar = false;
blnHasHScrollbar = false;
}
}
if (control.Visible)
{
if (m_lstVCache.ContainsKey(control))
{
m_lstVCache[control].Location = new System.Drawing.Point(control.Right - m_lstVCache[control].Width, control.Top);
if (blnHasHScrollbar)
{
m_lstVCache[control].Height = control.Height - m_lstHCache[control].Height;
}
else
{
m_lstVCache[control].Height = control.Height;
}
SetVMaxNum(control);
} if (m_lstHCache.ContainsKey(control))
{
m_lstHCache[control].Location = new System.Drawing.Point(control.Left, control.Bottom - m_lstHCache[control].Height);
//if (blnHasVScrollbar)
//{
// m_lstHCache[control].Width = control.Width - m_lstVCache[control].Width;
//}
//else
//{
m_lstHCache[control].Width = control.Width;
//}
SetHMaxNum(control);
}
}
} /// <summary>
/// Handles the VisibleChanged event of the control control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
void control_VisibleChanged(object sender, EventArgs e)
{
Control control = (Control)sender; if (m_lstVCache.ContainsKey(control) && m_lstVCache[control].Parent != null)
{
m_lstVCache[control].Visible = control.Visible;
} if (m_lstHCache.ContainsKey(control) && m_lstHCache[control].Parent != null)
{
m_lstHCache[control].Visible = control.Visible;
}
if (control.Visible)
{
control_SizeChanged(control, null);
}
} private const int HSCROLL = 0x100000;
private const int VSCROLL = 0x200000;
private const int STYLE = -; private Dictionary<Control, UCVScrollbar> m_lstVCache = new Dictionary<Control, UCVScrollbar>();
private Dictionary<Control, UCHScrollbar> m_lstHCache = new Dictionary<Control, UCHScrollbar>(); void barV_Scroll(object sender, EventArgs e)
{
UCVScrollbar bar = (UCVScrollbar)sender;
if (m_lstVCache.ContainsValue(bar))
{
Control c = m_lstVCache.FirstOrDefault(p => p.Value == bar).Key; //ControlHelper.SetVScrollValue(c.Handle, bar.Value);
if (c is ScrollableControl)
{
(c as ScrollableControl).AutoScrollPosition = new Point((c as ScrollableControl).AutoScrollPosition.X, bar.Value);
}
else if (c is TreeView)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value / ((c as TreeView).ItemHeight));
}
else if (c is TextBox)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value / ((c as TextBox).PreferredHeight));
}
else if (c is RichTextBox)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value);
}
else if (c is ListBox)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value / ((c as ListBox).ItemHeight));
}
else if (c is ListView)
{
ControlHelper.SetVScrollValue(c.Handle, bar.Value);
}
else if (c is DataGridView)
{
var dgv = (DataGridView)c;
if(bar.Value>)
dgv.FirstDisplayedScrollingRowIndex = bar.Value - ;
}
}
} void barH_Scroll(object sender, EventArgs e)
{
UCHScrollbar bar = (UCHScrollbar)sender;
if (m_lstHCache.ContainsValue(bar))
{
Control c = m_lstHCache.FirstOrDefault(p => p.Value == bar).Key;
if (c is ScrollableControl)
{
(c as ScrollableControl).AutoScrollPosition = new Point(bar.Value, (c as ScrollableControl).AutoScrollPosition.Y);
}
else if (c is TreeView)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
//TreeView tv = (c as TreeView);
//SetTreeViewVScrollLocation(tv, tv.Nodes, bar.Value);
}
else if (c is TextBox)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
//TextBox txt = (c as TextBox);
//SetTextBoxVScrollLocation(txt, bar.Value);
}
else if (c is RichTextBox)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
}
else if (c is ListBox)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
}
else if (c is ListView)
{
ControlHelper.SetHScrollValue(c.Handle, bar.Value);
}
else if (c is DataGridView)
{
var dgv = (DataGridView)c;
dgv.HorizontalScrollingOffset = bar.Value;
}
}
} #region Treeview處理 English:Treeview\u5904\u7406
void tv_AfterCollapse(object sender, TreeViewEventArgs e)
{
control_SizeChanged(sender as Control, null);
} void tv_AfterExpand(object sender, TreeViewEventArgs e)
{
control_SizeChanged(sender as Control, null);
} #endregion #region TextBox處理 English:TextBox Processing void txt_TextChanged(object sender, EventArgs e)
{
Control txt = sender as Control;
control_SizeChanged(txt, null);
} void txt_KeyDown(object sender, KeyEventArgs e)
{
Control txt = sender as Control;
control_SizeChanged(txt, null);
}
#endregion
}
}
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